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1000 <span id="997"> 997</span>
1001 <span id="998"> 998</span>
1002 <span id="999"> 999</span>
1003 <span id="1000">1000</span>
1004 <span id="1001">1001</span>
1005 <span id="1002">1002</span>
1006 <span id="1003">1003</span>
1007 <span id="1004">1004</span>
1008 <span id="1005">1005</span>
1009 <span id="1006">1006</span>
1010 <span id="1007">1007</span>
1011 <span id="1008">1008</span>
1012 <span id="1009">1009</span>
1013 <span id="1010">1010</span>
1014 <span id="1011">1011</span>
1015 <span id="1012">1012</span>
1016 <span id="1013">1013</span>
1017 <span id="1014">1014</span>
1018 <span id="1015">1015</span>
1019 <span id="1016">1016</span>
1020 <span id="1017">1017</span>
1021 <span id="1018">1018</span>
1022 <span id="1019">1019</span>
1023 <span id="1020">1020</span>
1024 <span id="1021">1021</span>
1025 <span id="1022">1022</span>
1026 <span id="1023">1023</span>
1027 <span id="1024">1024</span>
1028 <span id="1025">1025</span>
1029 <span id="1026">1026</span>
1030 <span id="1027">1027</span>
1031 <span id="1028">1028</span>
1032 <span id="1029">1029</span>
1033 <span id="1030">1030</span>
1034 <span id="1031">1031</span>
1035 <span id="1032">1032</span>
1036 <span id="1033">1033</span>
1037 <span id="1034">1034</span>
1038 <span id="1035">1035</span>
1039 <span id="1036">1036</span>
1040 <span id="1037">1037</span>
1041 <span id="1038">1038</span>
1042 <span id="1039">1039</span>
1043 <span id="1040">1040</span>
1044 <span id="1041">1041</span>
1045 <span id="1042">1042</span>
1046 <span id="1043">1043</span>
1047 <span id="1044">1044</span>
1048 <span id="1045">1045</span>
1049 <span id="1046">1046</span>
1050 <span id="1047">1047</span>
1051 <span id="1048">1048</span>
1052 <span id="1049">1049</span>
1053 <span id="1050">1050</span>
1054 <span id="1051">1051</span>
1055 <span id="1052">1052</span>
1056 <span id="1053">1053</span>
1057 <span id="1054">1054</span>
1058 <span id="1055">1055</span>
1059 <span id="1056">1056</span>
1060 <span id="1057">1057</span>
1061 <span id="1058">1058</span>
1062 <span id="1059">1059</span>
1063 <span id="1060">1060</span>
1064 <span id="1061">1061</span>
1065 <span id="1062">1062</span>
1066 <span id="1063">1063</span>
1067 <span id="1064">1064</span>
1068 <span id="1065">1065</span>
1069 <span id="1066">1066</span>
1070 <span id="1067">1067</span>
1071 <span id="1068">1068</span>
1072 <span id="1069">1069</span>
1073 <span id="1070">1070</span>
1074 <span id="1071">1071</span>
1075 <span id="1072">1072</span>
1076 <span id="1073">1073</span>
1077 <span id="1074">1074</span>
1078 <span id="1075">1075</span>
1079 <span id="1076">1076</span>
1080 <span id="1077">1077</span>
1081 <span id="1078">1078</span>
1082 <span id="1079">1079</span>
1083 <span id="1080">1080</span>
1084 <span id="1081">1081</span>
1085 <span id="1082">1082</span>
1086 <span id="1083">1083</span>
1087 <span id="1084">1084</span>
1088 <span id="1085">1085</span>
1089 <span id="1086">1086</span>
1090 <span id="1087">1087</span>
1091 <span id="1088">1088</span>
1092 <span id="1089">1089</span>
1093 <span id="1090">1090</span>
1094 <span id="1091">1091</span>
1095 <span id="1092">1092</span>
1096 <span id="1093">1093</span>
1097 <span id="1094">1094</span>
1098 <span id="1095">1095</span>
1099 <span id="1096">1096</span>
1100 <span id="1097">1097</span>
1101 <span id="1098">1098</span>
1102 <span id="1099">1099</span>
1103 <span id="1100">1100</span>
1104 <span id="1101">1101</span>
1105 <span id="1102">1102</span>
1106 <span id="1103">1103</span>
1107 <span id="1104">1104</span>
1108 <span id="1105">1105</span>
1109 <span id="1106">1106</span>
1110 <span id="1107">1107</span>
1111 <span id="1108">1108</span>
1112 <span id="1109">1109</span>
1113 <span id="1110">1110</span>
1114 <span id="1111">1111</span>
1115 <span id="1112">1112</span>
1116 <span id="1113">1113</span>
1117 <span id="1114">1114</span>
1118 <span id="1115">1115</span>
1119 <span id="1116">1116</span>
1120 <span id="1117">1117</span>
1121 <span id="1118">1118</span>
1122 <span id="1119">1119</span>
1123 <span id="1120">1120</span>
1124 <span id="1121">1121</span>
1125 <span id="1122">1122</span>
1126 <span id="1123">1123</span>
1127 <span id="1124">1124</span>
1128 <span id="1125">1125</span>
1129 <span id="1126">1126</span>
1130 <span id="1127">1127</span>
1131 <span id="1128">1128</span>
1132 <span id="1129">1129</span>
1133 <span id="1130">1130</span>
1134 <span id="1131">1131</span>
1135 <span id="1132">1132</span>
1136 <span id="1133">1133</span>
1137 <span id="1134">1134</span>
1138 <span id="1135">1135</span>
1139 <span id="1136">1136</span>
1140 <span id="1137">1137</span>
1141 <span id="1138">1138</span>
1142 <span id="1139">1139</span>
1143 <span id="1140">1140</span>
1144 <span id="1141">1141</span>
1145 <span id="1142">1142</span>
1146 <span id="1143">1143</span>
1147 <span id="1144">1144</span>
1148 <span id="1145">1145</span>
1149 <span id="1146">1146</span>
1150 <span id="1147">1147</span>
1151 <span id="1148">1148</span>
1152 <span id="1149">1149</span>
1153 <span id="1150">1150</span>
1154 <span id="1151">1151</span>
1155 <span id="1152">1152</span>
1156 <span id="1153">1153</span>
1157 <span id="1154">1154</span>
1158 <span id="1155">1155</span>
1159 <span id="1156">1156</span>
1160 <span id="1157">1157</span>
1161 <span id="1158">1158</span>
1162 <span id="1159">1159</span>
1163 <span id="1160">1160</span>
1164 <span id="1161">1161</span>
1165 <span id="1162">1162</span>
1166 <span id="1163">1163</span>
1167 <span id="1164">1164</span>
1168 <span id="1165">1165</span>
1169 <span id="1166">1166</span>
1170 <span id="1167">1167</span>
1171 <span id="1168">1168</span>
1172 <span id="1169">1169</span>
1173 <span id="1170">1170</span>
1174 <span id="1171">1171</span>
1175 <span id="1172">1172</span>
1176 <span id="1173">1173</span>
1177 <span id="1174">1174</span>
1178 <span id="1175">1175</span>
1179 <span id="1176">1176</span>
1180 <span id="1177">1177</span>
1181 <span id="1178">1178</span>
1182 <span id="1179">1179</span>
1183 <span id="1180">1180</span>
1184 <span id="1181">1181</span>
1185 <span id="1182">1182</span>
1186 <span id="1183">1183</span>
1187 <span id="1184">1184</span>
1188 <span id="1185">1185</span>
1189 <span id="1186">1186</span>
1190 <span id="1187">1187</span>
1191 <span id="1188">1188</span>
1192 <span id="1189">1189</span>
1193 <span id="1190">1190</span>
1194 <span id="1191">1191</span>
1195 <span id="1192">1192</span>
1196 <span id="1193">1193</span>
1197 <span id="1194">1194</span>
1198 <span id="1195">1195</span>
1199 <span id="1196">1196</span>
1200 <span id="1197">1197</span>
1201 <span id="1198">1198</span>
1202 <span id="1199">1199</span>
1203 <span id="1200">1200</span>
1204 <span id="1201">1201</span>
1205 <span id="1202">1202</span>
1206 <span id="1203">1203</span>
1207 <span id="1204">1204</span>
1208 <span id="1205">1205</span>
1209 <span id="1206">1206</span>
1210 <span id="1207">1207</span>
1211 <span id="1208">1208</span>
1212 <span id="1209">1209</span>
1213 <span id="1210">1210</span>
1214 <span id="1211">1211</span>
1215 <span id="1212">1212</span>
1216 <span id="1213">1213</span>
1217 <span id="1214">1214</span>
1218 <span id="1215">1215</span>
1219 <span id="1216">1216</span>
1220 <span id="1217">1217</span>
1221 <span id="1218">1218</span>
1222 <span id="1219">1219</span>
1223 <span id="1220">1220</span>
1224 <span id="1221">1221</span>
1225 <span id="1222">1222</span>
1226 <span id="1223">1223</span>
1227 <span id="1224">1224</span>
1228 <span id="1225">1225</span>
1229 <span id="1226">1226</span>
1230 <span id="1227">1227</span>
1231 <span id="1228">1228</span>
1232 </pre><div class="example-wrap"><pre class="rust ">
1233 <span class="comment">// Magical Bitcoin Library</span>
1234 <span class="comment">// Written in 2020 by</span>
1235 <span class="comment">//     Alekos Filini &lt;alekos.filini@gmail.com&gt;</span>
1236 <span class="comment">//</span>
1237 <span class="comment">// Copyright (c) 2020 Magical Bitcoin</span>
1238 <span class="comment">//</span>
1239 <span class="comment">// Permission is hereby granted, free of charge, to any person obtaining a copy</span>
1240 <span class="comment">// of this software and associated documentation files (the &quot;Software&quot;), to deal</span>
1241 <span class="comment">// in the Software without restriction, including without limitation the rights</span>
1242 <span class="comment">// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span>
1243 <span class="comment">// copies of the Software, and to permit persons to whom the Software is</span>
1244 <span class="comment">// furnished to do so, subject to the following conditions:</span>
1245 <span class="comment">//</span>
1246 <span class="comment">// The above copyright notice and this permission notice shall be included in all</span>
1247 <span class="comment">// copies or substantial portions of the Software.</span>
1248 <span class="comment">//</span>
1249 <span class="comment">// THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span>
1250 <span class="comment">// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span>
1251 <span class="comment">// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span>
1252 <span class="comment">// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span>
1253 <span class="comment">// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span>
1254 <span class="comment">// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE</span>
1255 <span class="comment">// SOFTWARE.</span>
1256
1257 <span class="doccomment">//! Descriptor policy</span>
1258 <span class="doccomment">//!</span>
1259 <span class="doccomment">//! This module implements the logic to extract and represent the spending policies of a descriptor</span>
1260 <span class="doccomment">//! in a more human-readable format.</span>
1261 <span class="doccomment">//!</span>
1262 <span class="doccomment">//! This is an **EXPERIMENTAL** feature, API and other major changes are expected.</span>
1263 <span class="doccomment">//!</span>
1264 <span class="doccomment">//! ## Example</span>
1265 <span class="doccomment">//!</span>
1266 <span class="doccomment">//! ```</span>
1267 <span class="doccomment">//! # use std::sync::Arc;</span>
1268 <span class="doccomment">//! # use bdk::descriptor::*;</span>
1269 <span class="doccomment">//! # use bdk::bitcoin::secp256k1::Secp256k1;</span>
1270 <span class="doccomment">//! let secp = Secp256k1::new();</span>
1271 <span class="doccomment">//! let desc = &quot;wsh(and_v(v:pk(cV3oCth6zxZ1UVsHLnGothsWNsaoxRhC6aeNi5VbSdFpwUkgkEci),or_d(pk(cVMTy7uebJgvFaSBwcgvwk8qn8xSLc97dKow4MBetjrrahZoimm2),older(12960))))&quot;;</span>
1272 <span class="doccomment">//!</span>
1273 <span class="doccomment">//! let (extended_desc, key_map) = ExtendedDescriptor::parse_descriptor(desc)?;</span>
1274 <span class="doccomment">//! println!(&quot;{:?}&quot;, extended_desc);</span>
1275 <span class="doccomment">//!</span>
1276 <span class="doccomment">//! let signers = Arc::new(key_map.into());</span>
1277 <span class="doccomment">//! let policy = extended_desc.extract_policy(&amp;signers, &amp;secp)?;</span>
1278 <span class="doccomment">//! println!(&quot;policy: {}&quot;, serde_json::to_string(&amp;policy)?);</span>
1279 <span class="doccomment">//! # Ok::&lt;(), bdk::Error&gt;(())</span>
1280 <span class="doccomment">//! ```</span>
1281
1282 <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cmp</span>::{<span class="ident">max</span>, <span class="ident">Ordering</span>};
1283 <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::{<span class="ident">BTreeMap</span>, <span class="ident">HashSet</span>, <span class="ident">VecDeque</span>};
1284 <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;
1285
1286 <span class="kw">use</span> <span class="ident">serde</span>::<span class="ident">ser</span>::<span class="ident">SerializeMap</span>;
1287 <span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Serialize</span>, <span class="ident">Serializer</span>};
1288
1289 <span class="kw">use</span> <span class="ident">bitcoin</span>::<span class="ident">hashes</span>::<span class="kw-2">*</span>;
1290 <span class="kw">use</span> <span class="ident">bitcoin</span>::<span class="ident">util</span>::<span class="ident">bip32</span>::<span class="ident">Fingerprint</span>;
1291 <span class="kw">use</span> <span class="ident">bitcoin</span>::<span class="ident">PublicKey</span>;
1292
1293 <span class="kw">use</span> <span class="ident">miniscript</span>::<span class="ident">descriptor</span>::{<span class="ident">DescriptorPublicKey</span>, <span class="ident">SortedMultiVec</span>};
1294 <span class="kw">use</span> <span class="ident">miniscript</span>::{<span class="ident">Descriptor</span>, <span class="ident">Miniscript</span>, <span class="ident">MiniscriptKey</span>, <span class="ident">ScriptContext</span>, <span class="ident">Terminal</span>, <span class="ident">ToPublicKey</span>};
1295
1296 <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_imports</span>)]</span>
1297 <span class="kw">use</span> <span class="ident">log</span>::{<span class="ident">debug</span>, <span class="ident">error</span>, <span class="ident">info</span>, <span class="ident">trace</span>};
1298
1299 <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">descriptor</span>::<span class="ident">ExtractPolicy</span>;
1300 <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">wallet</span>::<span class="ident">signer</span>::{<span class="ident">SignerId</span>, <span class="ident">SignersContainer</span>};
1301 <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">wallet</span>::<span class="ident">utils</span>::{<span class="self">self</span>, <span class="ident">descriptor_to_pk_ctx</span>, <span class="ident">SecpCtx</span>};
1302
1303 <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">checksum</span>::<span class="ident">get_checksum</span>;
1304 <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">error</span>::<span class="ident">Error</span>;
1305 <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">XKeyUtils</span>;
1306
1307 <span class="doccomment">/// Raw public key or extended key fingerprint</span>
1308 <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Default</span>, <span class="ident">Serialize</span>)]</span>
1309 <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">PKOrF</span> {
1310     <span class="attribute">#[<span class="ident">serde</span>(<span class="ident">skip_serializing_if</span> <span class="op">=</span> <span class="string">&quot;Option::is_none&quot;</span>)]</span>
1311     <span class="ident">pubkey</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">PublicKey</span><span class="op">&gt;</span>,
1312     <span class="attribute">#[<span class="ident">serde</span>(<span class="ident">skip_serializing_if</span> <span class="op">=</span> <span class="string">&quot;Option::is_none&quot;</span>)]</span>
1313     <span class="ident">pubkey_hash</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">hash160</span>::<span class="ident">Hash</span><span class="op">&gt;</span>,
1314     <span class="attribute">#[<span class="ident">serde</span>(<span class="ident">skip_serializing_if</span> <span class="op">=</span> <span class="string">&quot;Option::is_none&quot;</span>)]</span>
1315     <span class="ident">fingerprint</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Fingerprint</span><span class="op">&gt;</span>,
1316 }
1317
1318 <span class="kw">impl</span> <span class="ident">PKOrF</span> {
1319     <span class="kw">fn</span> <span class="ident">from_key</span>(<span class="ident">k</span>: <span class="kw-2">&amp;</span><span class="ident">DescriptorPublicKey</span>, <span class="ident">secp</span>: <span class="kw-2">&amp;</span><span class="ident">SecpCtx</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
1320         <span class="kw">match</span> <span class="ident">k</span> {
1321             <span class="ident">DescriptorPublicKey</span>::<span class="ident">SinglePub</span>(<span class="ident">pubkey</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">PKOrF</span> {
1322                 <span class="ident">pubkey</span>: <span class="prelude-val">Some</span>(<span class="ident">pubkey</span>.<span class="ident">key</span>),
1323                 ..<span class="ident">Default</span>::<span class="ident">default</span>()
1324             },
1325             <span class="ident">DescriptorPublicKey</span>::<span class="ident">XPub</span>(<span class="ident">xpub</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">PKOrF</span> {
1326                 <span class="ident">fingerprint</span>: <span class="prelude-val">Some</span>(<span class="ident">xpub</span>.<span class="ident">root_fingerprint</span>(<span class="ident">secp</span>)),
1327                 ..<span class="ident">Default</span>::<span class="ident">default</span>()
1328             },
1329         }
1330     }
1331
1332     <span class="kw">fn</span> <span class="ident">from_key_hash</span>(<span class="ident">k</span>: <span class="ident">hash160</span>::<span class="ident">Hash</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
1333         <span class="ident">PKOrF</span> {
1334             <span class="ident">pubkey_hash</span>: <span class="prelude-val">Some</span>(<span class="ident">k</span>),
1335             ..<span class="ident">Default</span>::<span class="ident">default</span>()
1336         }
1337     }
1338 }
1339
1340 <span class="doccomment">/// An item that needs to be satisfied</span>
1341 <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Serialize</span>)]</span>
1342 <span class="attribute">#[<span class="ident">serde</span>(<span class="ident">tag</span> <span class="op">=</span> <span class="string">&quot;type&quot;</span>, <span class="ident">rename_all</span> <span class="op">=</span> <span class="string">&quot;UPPERCASE&quot;</span>)]</span>
1343 <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">SatisfiableItem</span> {
1344     <span class="comment">// Leaves</span>
1345     <span class="doccomment">/// Signature for a raw public key</span>
1346     <span class="ident">Signature</span>(<span class="ident">PKOrF</span>),
1347     <span class="doccomment">/// Signature for an extended key fingerprint</span>
1348     <span class="ident">SignatureKey</span>(<span class="ident">PKOrF</span>),
1349     <span class="doccomment">/// SHA256 preimage hash</span>
1350     <span class="ident">SHA256Preimage</span> {
1351         <span class="doccomment">/// The digest value</span>
1352         <span class="ident">hash</span>: <span class="ident">sha256</span>::<span class="ident">Hash</span>,
1353     },
1354     <span class="doccomment">/// Double SHA256 preimage hash</span>
1355     <span class="ident">HASH256Preimage</span> {
1356         <span class="doccomment">/// The digest value</span>
1357         <span class="ident">hash</span>: <span class="ident">sha256d</span>::<span class="ident">Hash</span>,
1358     },
1359     <span class="doccomment">/// RIPEMD160 preimage hash</span>
1360     <span class="ident">RIPEMD160Preimage</span> {
1361         <span class="doccomment">/// The digest value</span>
1362         <span class="ident">hash</span>: <span class="ident">ripemd160</span>::<span class="ident">Hash</span>,
1363     },
1364     <span class="doccomment">/// SHA256 then RIPEMD160 preimage hash</span>
1365     <span class="ident">HASH160Preimage</span> {
1366         <span class="doccomment">/// The digest value</span>
1367         <span class="ident">hash</span>: <span class="ident">hash160</span>::<span class="ident">Hash</span>,
1368     },
1369     <span class="doccomment">/// Absolute timeclock timestamp</span>
1370     <span class="ident">AbsoluteTimelock</span> {
1371         <span class="doccomment">/// The timestamp value</span>
1372         <span class="ident">value</span>: <span class="ident">u32</span>,
1373     },
1374     <span class="doccomment">/// Relative timelock locktime</span>
1375     <span class="ident">RelativeTimelock</span> {
1376         <span class="doccomment">/// The locktime value</span>
1377         <span class="ident">value</span>: <span class="ident">u32</span>,
1378     },
1379     <span class="doccomment">/// Multi-signature public keys with threshold count</span>
1380     <span class="ident">Multisig</span> {
1381         <span class="doccomment">/// The raw public key or extended key fingerprint</span>
1382         <span class="ident">keys</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">PKOrF</span><span class="op">&gt;</span>,
1383         <span class="doccomment">/// The required threshold count</span>
1384         <span class="ident">threshold</span>: <span class="ident">usize</span>,
1385     },
1386
1387     <span class="comment">// Complex item</span>
1388     <span class="doccomment">/// Threshold items with threshold count</span>
1389     <span class="ident">Thresh</span> {
1390         <span class="doccomment">/// The policy items</span>
1391         <span class="ident">items</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Policy</span><span class="op">&gt;</span>,
1392         <span class="doccomment">/// The required threshold count</span>
1393         <span class="ident">threshold</span>: <span class="ident">usize</span>,
1394     },
1395 }
1396
1397 <span class="kw">impl</span> <span class="ident">SatisfiableItem</span> {
1398     <span class="doccomment">/// Returns whether the [`SatisfiableItem`] is a leaf item</span>
1399     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_leaf</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
1400         <span class="op">!</span><span class="macro">matches</span><span class="macro">!</span>(<span class="self">self</span>,
1401         <span class="ident">SatisfiableItem</span>::<span class="ident">Thresh</span> {
1402             <span class="ident">items</span>: <span class="kw">_</span>,
1403             <span class="ident">threshold</span>: <span class="kw">_</span>,
1404         })
1405     }
1406
1407     <span class="doccomment">/// Returns a unique id for the [`SatisfiableItem`]</span>
1408     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">id</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
1409         <span class="ident">get_checksum</span>(<span class="kw-2">&amp;</span><span class="ident">serde_json</span>::<span class="ident">to_string</span>(<span class="self">self</span>).<span class="ident">expect</span>(<span class="string">&quot;Failed to serialize a SatisfiableItem&quot;</span>))
1410             .<span class="ident">expect</span>(<span class="string">&quot;Failed to compute a SatisfiableItem id&quot;</span>)
1411     }
1412 }
1413
1414 <span class="kw">fn</span> <span class="ident">combinations</span>(<span class="ident">vec</span>: <span class="kw-2">&amp;</span>[<span class="ident">usize</span>], <span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span><span class="op">&gt;</span> {
1415     <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">vec</span>.<span class="ident">len</span>() <span class="op">&gt;</span><span class="op">=</span> <span class="ident">size</span>);
1416
1417     <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">answer</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
1418
1419     <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">queue</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">new</span>();
1420     <span class="kw">for</span> (<span class="ident">index</span>, <span class="ident">val</span>) <span class="kw">in</span> <span class="ident">vec</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
1421         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">new_vec</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">size</span>);
1422         <span class="ident">new_vec</span>.<span class="ident">push</span>(<span class="kw-2">*</span><span class="ident">val</span>);
1423         <span class="ident">queue</span>.<span class="ident">push_back</span>((<span class="ident">index</span>, <span class="ident">new_vec</span>));
1424     }
1425
1426     <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">index</span>, <span class="ident">vals</span>)) <span class="op">=</span> <span class="ident">queue</span>.<span class="ident">pop_front</span>() {
1427         <span class="kw">if</span> <span class="ident">vals</span>.<span class="ident">len</span>() <span class="op">&gt;</span><span class="op">=</span> <span class="ident">size</span> {
1428             <span class="ident">answer</span>.<span class="ident">push</span>(<span class="ident">vals</span>);
1429         } <span class="kw">else</span> {
1430             <span class="kw">for</span> (<span class="ident">new_index</span>, <span class="ident">val</span>) <span class="kw">in</span> <span class="ident">vec</span>.<span class="ident">iter</span>().<span class="ident">skip</span>(<span class="ident">index</span> <span class="op">+</span> <span class="number">1</span>).<span class="ident">enumerate</span>() {
1431                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cloned</span> <span class="op">=</span> <span class="ident">vals</span>.<span class="ident">clone</span>();
1432                 <span class="ident">cloned</span>.<span class="ident">push</span>(<span class="kw-2">*</span><span class="ident">val</span>);
1433                 <span class="ident">queue</span>.<span class="ident">push_front</span>((<span class="ident">new_index</span>, <span class="ident">cloned</span>));
1434             }
1435         }
1436     }
1437
1438     <span class="ident">answer</span>
1439 }
1440
1441 <span class="kw">fn</span> <span class="ident">mix</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Clone</span><span class="op">&gt;</span>(<span class="ident">vec</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span> {
1442     <span class="kw">if</span> <span class="ident">vec</span>.<span class="ident">is_empty</span>() <span class="op">|</span><span class="op">|</span> <span class="ident">vec</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="ident">Vec</span>::<span class="ident">is_empty</span>) {
1443         <span class="kw">return</span> <span class="macro">vec</span><span class="macro">!</span>[];
1444     }
1445
1446     <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">answer</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
1447     <span class="kw">let</span> <span class="ident">size</span> <span class="op">=</span> <span class="ident">vec</span>.<span class="ident">len</span>();
1448
1449     <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">queue</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">new</span>();
1450     <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">vec</span>[<span class="number">0</span>] {
1451         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">new_vec</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">size</span>);
1452         <span class="ident">new_vec</span>.<span class="ident">push</span>(<span class="ident">i</span>.<span class="ident">clone</span>());
1453         <span class="ident">queue</span>.<span class="ident">push_back</span>(<span class="ident">new_vec</span>);
1454     }
1455
1456     <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">vals</span>) <span class="op">=</span> <span class="ident">queue</span>.<span class="ident">pop_front</span>() {
1457         <span class="kw">if</span> <span class="ident">vals</span>.<span class="ident">len</span>() <span class="op">&gt;</span><span class="op">=</span> <span class="ident">size</span> {
1458             <span class="ident">answer</span>.<span class="ident">push</span>(<span class="ident">vals</span>);
1459         } <span class="kw">else</span> {
1460             <span class="kw">let</span> <span class="ident">level</span> <span class="op">=</span> <span class="ident">vals</span>.<span class="ident">len</span>();
1461             <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">vec</span>[<span class="ident">level</span>] {
1462                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cloned</span> <span class="op">=</span> <span class="ident">vals</span>.<span class="ident">clone</span>();
1463                 <span class="ident">cloned</span>.<span class="ident">push</span>(<span class="ident">i</span>.<span class="ident">clone</span>());
1464                 <span class="ident">queue</span>.<span class="ident">push_front</span>(<span class="ident">cloned</span>);
1465             }
1466         }
1467     }
1468
1469     <span class="ident">answer</span>
1470 }
1471
1472 <span class="doccomment">/// Type for a map of sets of [`Condition`] items keyed by each set&#39;s index</span>
1473 <span class="kw">pub</span> <span class="kw">type</span> <span class="ident">ConditionMap</span> <span class="op">=</span> <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">usize</span>, <span class="ident">HashSet</span><span class="op">&lt;</span><span class="ident">Condition</span><span class="op">&gt;</span><span class="op">&gt;</span>;
1474 <span class="doccomment">/// Type for a map of folded sets of [`Condition`] items keyed by a vector of the combined set&#39;s indexes</span>
1475 <span class="kw">pub</span> <span class="kw">type</span> <span class="ident">FoldedConditionMap</span> <span class="op">=</span> <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>, <span class="ident">HashSet</span><span class="op">&lt;</span><span class="ident">Condition</span><span class="op">&gt;</span><span class="op">&gt;</span>;
1476
1477 <span class="kw">fn</span> <span class="ident">serialize_folded_cond_map</span><span class="op">&lt;</span><span class="ident">S</span><span class="op">&gt;</span>(
1478     <span class="ident">input_map</span>: <span class="kw-2">&amp;</span><span class="ident">FoldedConditionMap</span>,
1479     <span class="ident">serializer</span>: <span class="ident">S</span>,
1480 ) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">S</span>::<span class="prelude-val">Ok</span>, <span class="ident">S</span>::<span class="ident">Error</span><span class="op">&gt;</span>
1481 <span class="kw">where</span>
1482     <span class="ident">S</span>: <span class="ident">Serializer</span>,
1483 {
1484     <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span> <span class="op">=</span> <span class="ident">serializer</span>.<span class="ident">serialize_map</span>(<span class="prelude-val">Some</span>(<span class="ident">input_map</span>.<span class="ident">len</span>()))<span class="question-mark">?</span>;
1485     <span class="kw">for</span> (<span class="ident">k</span>, <span class="ident">v</span>) <span class="kw">in</span> <span class="ident">input_map</span> {
1486         <span class="kw">let</span> <span class="ident">k_string</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">k</span>);
1487         <span class="ident">map</span>.<span class="ident">serialize_entry</span>(<span class="kw-2">&amp;</span><span class="ident">k_string</span>, <span class="ident">v</span>)<span class="question-mark">?</span>;
1488     }
1489     <span class="ident">map</span>.<span class="ident">end</span>()
1490 }
1491
1492 <span class="doccomment">/// Represent if and how much a policy item is satisfied by the wallet&#39;s descriptor</span>
1493 <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Serialize</span>)]</span>
1494 <span class="attribute">#[<span class="ident">serde</span>(<span class="ident">tag</span> <span class="op">=</span> <span class="string">&quot;type&quot;</span>, <span class="ident">rename_all</span> <span class="op">=</span> <span class="string">&quot;UPPERCASE&quot;</span>)]</span>
1495 <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Satisfaction</span> {
1496     <span class="doccomment">/// Only a partial satisfaction of some kind of threshold policy</span>
1497     <span class="ident">Partial</span> {
1498         <span class="doccomment">/// Total number of items</span>
1499         <span class="ident">n</span>: <span class="ident">usize</span>,
1500         <span class="doccomment">/// Threshold</span>
1501         <span class="ident">m</span>: <span class="ident">usize</span>,
1502         <span class="doccomment">/// The items that can be satisfied by the descriptor</span>
1503         <span class="ident">items</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>,
1504         <span class="attribute">#[<span class="ident">serde</span>(<span class="ident">skip_serializing_if</span> <span class="op">=</span> <span class="string">&quot;Option::is_none&quot;</span>)]</span>
1505         <span class="doccomment">/// Whether the items are sorted in lexicographic order (used by `sortedmulti`)</span>
1506         <span class="ident">sorted</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</span>,
1507         <span class="attribute">#[<span class="ident">serde</span>(<span class="ident">skip_serializing_if</span> <span class="op">=</span> <span class="string">&quot;BTreeMap::is_empty&quot;</span>)]</span>
1508         <span class="doccomment">/// Extra conditions that also need to be satisfied</span>
1509         <span class="ident">conditions</span>: <span class="ident">ConditionMap</span>,
1510     },
1511     <span class="doccomment">/// Can reach the threshold of some kind of threshold policy</span>
1512     <span class="ident">PartialComplete</span> {
1513         <span class="doccomment">/// Total number of items</span>
1514         <span class="ident">n</span>: <span class="ident">usize</span>,
1515         <span class="doccomment">/// Threshold</span>
1516         <span class="ident">m</span>: <span class="ident">usize</span>,
1517         <span class="doccomment">/// The items that can be satisfied by the descriptor</span>
1518         <span class="ident">items</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>,
1519         <span class="attribute">#[<span class="ident">serde</span>(<span class="ident">skip_serializing_if</span> <span class="op">=</span> <span class="string">&quot;Option::is_none&quot;</span>)]</span>
1520         <span class="doccomment">/// Whether the items are sorted in lexicographic order (used by `sortedmulti`)</span>
1521         <span class="ident">sorted</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</span>,
1522         <span class="attribute">#[<span class="ident">serde</span>(
1523             <span class="ident">serialize_with</span> <span class="op">=</span> <span class="string">&quot;serialize_folded_cond_map&quot;</span>,
1524             <span class="ident">skip_serializing_if</span> <span class="op">=</span> <span class="string">&quot;BTreeMap::is_empty&quot;</span>
1525         )]</span>
1526         <span class="doccomment">/// Extra conditions that also need to be satisfied</span>
1527         <span class="ident">conditions</span>: <span class="ident">FoldedConditionMap</span>,
1528     },
1529
1530     <span class="doccomment">/// Can satisfy the policy item</span>
1531     <span class="ident">Complete</span> {
1532         <span class="doccomment">/// Extra conditions that also need to be satisfied</span>
1533         <span class="ident">condition</span>: <span class="ident">Condition</span>,
1534     },
1535     <span class="doccomment">/// Cannot satisfy or contribute to the policy item</span>
1536     <span class="prelude-val">None</span>,
1537 }
1538
1539 <span class="kw">impl</span> <span class="ident">Satisfaction</span> {
1540     <span class="doccomment">/// Returns whether the [`Satisfaction`] is a leaf item</span>
1541     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_leaf</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
1542         <span class="kw">match</span> <span class="self">self</span> {
1543             <span class="ident">Satisfaction</span>::<span class="prelude-val">None</span> <span class="op">|</span> <span class="ident">Satisfaction</span>::<span class="ident">Complete</span> { .. } <span class="op">=</span><span class="op">&gt;</span> <span class="bool-val">true</span>,
1544             <span class="ident">Satisfaction</span>::<span class="ident">PartialComplete</span> { .. } <span class="op">|</span> <span class="ident">Satisfaction</span>::<span class="ident">Partial</span> { .. } <span class="op">=</span><span class="op">&gt;</span> <span class="bool-val">false</span>,
1545         }
1546     }
1547
1548     <span class="comment">// add `inner` as one of self&#39;s partial items. this only makes sense on partials</span>
1549     <span class="kw">fn</span> <span class="ident">add</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">inner</span>: <span class="kw-2">&amp;</span><span class="ident">Satisfaction</span>, <span class="ident">inner_index</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">PolicyError</span><span class="op">&gt;</span> {
1550         <span class="kw">match</span> <span class="self">self</span> {
1551             <span class="ident">Satisfaction</span>::<span class="prelude-val">None</span> <span class="op">|</span> <span class="ident">Satisfaction</span>::<span class="ident">Complete</span> { .. } <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">PolicyError</span>::<span class="ident">AddOnLeaf</span>),
1552             <span class="ident">Satisfaction</span>::<span class="ident">PartialComplete</span> { .. } <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">PolicyError</span>::<span class="ident">AddOnPartialComplete</span>),
1553             <span class="ident">Satisfaction</span>::<span class="ident">Partial</span> {
1554                 <span class="ident">n</span>,
1555                 <span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">conditions</span>,
1556                 <span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">items</span>,
1557                 ..
1558             } <span class="op">=</span><span class="op">&gt;</span> {
1559                 <span class="kw">if</span> <span class="ident">inner_index</span> <span class="op">&gt;</span><span class="op">=</span> <span class="kw-2">*</span><span class="ident">n</span> <span class="op">|</span><span class="op">|</span> <span class="ident">items</span>.<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="ident">inner_index</span>) {
1560                     <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">PolicyError</span>::<span class="ident">IndexOutOfRange</span>(<span class="ident">inner_index</span>));
1561                 }
1562
1563                 <span class="kw">match</span> <span class="ident">inner</span> {
1564                     <span class="comment">// not relevant if not completed yet</span>
1565                     <span class="ident">Satisfaction</span>::<span class="prelude-val">None</span> <span class="op">|</span> <span class="ident">Satisfaction</span>::<span class="ident">Partial</span> { .. } <span class="op">=</span><span class="op">&gt;</span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(()),
1566                     <span class="ident">Satisfaction</span>::<span class="ident">Complete</span> { <span class="ident">condition</span> } <span class="op">=</span><span class="op">&gt;</span> {
1567                         <span class="ident">items</span>.<span class="ident">push</span>(<span class="ident">inner_index</span>);
1568                         <span class="ident">conditions</span>.<span class="ident">insert</span>(<span class="ident">inner_index</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="kw-2">*</span><span class="ident">condition</span>].<span class="ident">into_iter</span>().<span class="ident">collect</span>());
1569                     }
1570                     <span class="ident">Satisfaction</span>::<span class="ident">PartialComplete</span> {
1571                         <span class="ident">conditions</span>: <span class="ident">other_conditions</span>,
1572                         ..
1573                     } <span class="op">=</span><span class="op">&gt;</span> {
1574                         <span class="ident">items</span>.<span class="ident">push</span>(<span class="ident">inner_index</span>);
1575                         <span class="kw">let</span> <span class="ident">conditions_set</span> <span class="op">=</span> <span class="ident">other_conditions</span>
1576                             .<span class="ident">values</span>()
1577                             .<span class="ident">fold</span>(<span class="ident">HashSet</span>::<span class="ident">new</span>(), <span class="op">|</span><span class="ident">set</span>, <span class="ident">i</span><span class="op">|</span> <span class="ident">set</span>.<span class="ident">union</span>(<span class="kw-2">&amp;</span><span class="ident">i</span>).<span class="ident">cloned</span>().<span class="ident">collect</span>());
1578                         <span class="ident">conditions</span>.<span class="ident">insert</span>(<span class="ident">inner_index</span>, <span class="ident">conditions_set</span>);
1579                     }
1580                 }
1581
1582                 <span class="prelude-val">Ok</span>(())
1583             }
1584         }
1585     }
1586
1587     <span class="kw">fn</span> <span class="ident">finalize</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">PolicyError</span><span class="op">&gt;</span> {
1588         <span class="comment">// if partial try to bump it to a partialcomplete</span>
1589         <span class="kw">if</span> <span class="kw">let</span> <span class="ident">Satisfaction</span>::<span class="ident">Partial</span> {
1590             <span class="ident">n</span>,
1591             <span class="ident">m</span>,
1592             <span class="ident">items</span>,
1593             <span class="ident">conditions</span>,
1594             <span class="ident">sorted</span>,
1595         } <span class="op">=</span> <span class="self">self</span>
1596         {
1597             <span class="kw">if</span> <span class="ident">items</span>.<span class="ident">len</span>() <span class="op">&gt;</span><span class="op">=</span> <span class="kw-2">*</span><span class="ident">m</span> {
1598                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
1599                 <span class="kw">let</span> <span class="ident">indexes</span> <span class="op">=</span> <span class="ident">combinations</span>(<span class="ident">items</span>, <span class="kw-2">*</span><span class="ident">m</span>);
1600                 <span class="comment">// `indexes` at this point is a Vec&lt;Vec&lt;usize&gt;&gt;, with the &quot;n choose k&quot; of items (m of n)</span>
1601                 <span class="ident">indexes</span>
1602                     .<span class="ident">into_iter</span>()
1603                     <span class="comment">// .inspect(|x| println!(&quot;--- orig --- {:?}&quot;, x))</span>
1604                     <span class="comment">// we map each of the combinations of elements into a tuple of ([choosen items], [conditions]). unfortunately, those items have potentially more than one</span>
1605                     <span class="comment">// condition (think about ORs), so we also use `mix` to expand those, i.e. [[0], [1, 2]] becomes [[0, 1], [0, 2]]. This is necessary to make sure that we</span>
1606                     <span class="comment">// consider every possibile options and check whether or not they are compatible.</span>
1607                     .<span class="ident">map</span>(<span class="op">|</span><span class="ident">i_vec</span><span class="op">|</span> {
1608                         <span class="ident">mix</span>(<span class="ident">i_vec</span>
1609                             .<span class="ident">iter</span>()
1610                             .<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> {
1611                                 <span class="ident">conditions</span>
1612                                     .<span class="ident">get</span>(<span class="ident">i</span>)
1613                                     .<span class="ident">map</span>(<span class="op">|</span><span class="ident">set</span><span class="op">|</span> <span class="ident">set</span>.<span class="ident">clone</span>().<span class="ident">into_iter</span>().<span class="ident">collect</span>())
1614                                     .<span class="ident">unwrap_or_default</span>()
1615                             })
1616                             .<span class="ident">collect</span>())
1617                         .<span class="ident">into_iter</span>()
1618                         .<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> (<span class="ident">i_vec</span>.<span class="ident">clone</span>(), <span class="ident">x</span>))
1619                         .<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>, <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Condition</span><span class="op">&gt;</span>)<span class="op">&gt;</span><span class="op">&gt;</span>()
1620                     })
1621                     <span class="comment">// .inspect(|x: &amp;Vec&lt;(Vec&lt;usize&gt;, Vec&lt;Condition&gt;)&gt;| println!(&quot;fetch {:?}&quot;, x))</span>
1622                     <span class="comment">// since the previous step can turn one item of the iterator into multiple ones, we call flatten to expand them out</span>
1623                     .<span class="ident">flatten</span>()
1624                     <span class="comment">// .inspect(|x| println!(&quot;flat {:?}&quot;, x))</span>
1625                     <span class="comment">// try to fold all the conditions for this specific combination of indexes/options. if they are not compatible, try_fold will be Err</span>
1626                     .<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">key</span>, <span class="ident">val</span>)<span class="op">|</span> {
1627                         (
1628                             <span class="ident">key</span>,
1629                             <span class="ident">val</span>.<span class="ident">into_iter</span>()
1630                                 .<span class="ident">try_fold</span>(<span class="ident">Condition</span>::<span class="ident">default</span>(), <span class="op">|</span><span class="ident">acc</span>, <span class="ident">v</span><span class="op">|</span> <span class="ident">acc</span>.<span class="ident">merge</span>(<span class="kw-2">&amp;</span><span class="ident">v</span>)),
1631                         )
1632                     })
1633                     <span class="comment">// .inspect(|x| println!(&quot;try_fold {:?}&quot;, x))</span>
1634                     <span class="comment">// filter out all the incompatible combinations</span>
1635                     .<span class="ident">filter</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">val</span>)<span class="op">|</span> <span class="ident">val</span>.<span class="ident">is_ok</span>())
1636                     <span class="comment">// .inspect(|x| println!(&quot;filter {:?}&quot;, x))</span>
1637                     <span class="comment">// push them into the map</span>
1638                     .<span class="ident">for_each</span>(<span class="op">|</span>(<span class="ident">key</span>, <span class="ident">val</span>)<span class="op">|</span> {
1639                         <span class="ident">map</span>.<span class="ident">entry</span>(<span class="ident">key</span>)
1640                             .<span class="ident">or_insert_with</span>(<span class="ident">HashSet</span>::<span class="ident">new</span>)
1641                             .<span class="ident">insert</span>(<span class="ident">val</span>.<span class="ident">unwrap</span>());
1642                     });
1643                 <span class="comment">// TODO: if the map is empty, the conditions are not compatible, return an error?</span>
1644                 <span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="ident">Satisfaction</span>::<span class="ident">PartialComplete</span> {
1645                     <span class="ident">n</span>: <span class="kw-2">*</span><span class="ident">n</span>,
1646                     <span class="ident">m</span>: <span class="kw-2">*</span><span class="ident">m</span>,
1647                     <span class="ident">items</span>: <span class="ident">items</span>.<span class="ident">clone</span>(),
1648                     <span class="ident">conditions</span>: <span class="ident">map</span>,
1649                     <span class="ident">sorted</span>: <span class="kw-2">*</span><span class="ident">sorted</span>,
1650                 };
1651             }
1652         }
1653
1654         <span class="prelude-val">Ok</span>(())
1655     }
1656 }
1657
1658 <span class="kw">impl</span> <span class="ident">From</span><span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Satisfaction</span> {
1659     <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">other</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
1660         <span class="kw">if</span> <span class="ident">other</span> {
1661             <span class="ident">Satisfaction</span>::<span class="ident">Complete</span> {
1662                 <span class="ident">condition</span>: <span class="ident">Default</span>::<span class="ident">default</span>(),
1663             }
1664         } <span class="kw">else</span> {
1665             <span class="ident">Satisfaction</span>::<span class="prelude-val">None</span>
1666         }
1667     }
1668 }
1669
1670 <span class="doccomment">/// Descriptor spending policy</span>
1671 <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Serialize</span>)]</span>
1672 <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Policy</span> {
1673     <span class="doccomment">/// Identifier for this policy node</span>
1674     <span class="kw">pub</span> <span class="ident">id</span>: <span class="ident">String</span>,
1675
1676     <span class="doccomment">/// Type of this policy node</span>
1677     <span class="attribute">#[<span class="ident">serde</span>(<span class="ident">flatten</span>)]</span>
1678     <span class="kw">pub</span> <span class="ident">item</span>: <span class="ident">SatisfiableItem</span>,
1679     <span class="doccomment">/// How a much given PSBT already satisfies this polcy node **(currently unused)**</span>
1680     <span class="kw">pub</span> <span class="ident">satisfaction</span>: <span class="ident">Satisfaction</span>,
1681     <span class="doccomment">/// How the wallet&#39;s descriptor can satisfy this policy node</span>
1682     <span class="kw">pub</span> <span class="ident">contribution</span>: <span class="ident">Satisfaction</span>,
1683 }
1684
1685 <span class="doccomment">/// An extra condition that must be satisfied but that is out of control of the user</span>
1686 <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Hash</span>, <span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Ord</span>, <span class="ident">Default</span>, <span class="ident">Serialize</span>)]</span>
1687 <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Condition</span> {
1688     <span class="doccomment">/// Optional CheckSequenceVerify condition</span>
1689     <span class="attribute">#[<span class="ident">serde</span>(<span class="ident">skip_serializing_if</span> <span class="op">=</span> <span class="string">&quot;Option::is_none&quot;</span>)]</span>
1690     <span class="kw">pub</span> <span class="ident">csv</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>,
1691     <span class="doccomment">/// Optional timelock condition</span>
1692     <span class="attribute">#[<span class="ident">serde</span>(<span class="ident">skip_serializing_if</span> <span class="op">=</span> <span class="string">&quot;Option::is_none&quot;</span>)]</span>
1693     <span class="kw">pub</span> <span class="ident">timelock</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>,
1694 }
1695
1696 <span class="kw">impl</span> <span class="ident">Condition</span> {
1697     <span class="kw">fn</span> <span class="ident">merge_nlocktime</span>(<span class="ident">a</span>: <span class="ident">u32</span>, <span class="ident">b</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">u32</span>, <span class="ident">PolicyError</span><span class="op">&gt;</span> {
1698         <span class="kw">if</span> (<span class="ident">a</span> <span class="op">&lt;</span> <span class="ident">utils</span>::<span class="ident">BLOCKS_TIMELOCK_THRESHOLD</span>) <span class="op">!</span><span class="op">=</span> (<span class="ident">b</span> <span class="op">&lt;</span> <span class="ident">utils</span>::<span class="ident">BLOCKS_TIMELOCK_THRESHOLD</span>) {
1699             <span class="prelude-val">Err</span>(<span class="ident">PolicyError</span>::<span class="ident">MixedTimelockUnits</span>)
1700         } <span class="kw">else</span> {
1701             <span class="prelude-val">Ok</span>(<span class="ident">max</span>(<span class="ident">a</span>, <span class="ident">b</span>))
1702         }
1703     }
1704
1705     <span class="kw">fn</span> <span class="ident">merge_nsequence</span>(<span class="ident">a</span>: <span class="ident">u32</span>, <span class="ident">b</span>: <span class="ident">u32</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">u32</span>, <span class="ident">PolicyError</span><span class="op">&gt;</span> {
1706         <span class="kw">let</span> <span class="ident">mask</span> <span class="op">=</span> <span class="ident">utils</span>::<span class="ident">SEQUENCE_LOCKTIME_TYPE_FLAG</span> <span class="op">|</span> <span class="ident">utils</span>::<span class="ident">SEQUENCE_LOCKTIME_MASK</span>;
1707
1708         <span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">a</span> <span class="op">&amp;</span> <span class="ident">mask</span>;
1709         <span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">b</span> <span class="op">&amp;</span> <span class="ident">mask</span>;
1710
1711         <span class="kw">if</span> (<span class="ident">a</span> <span class="op">&lt;</span> <span class="ident">utils</span>::<span class="ident">SEQUENCE_LOCKTIME_TYPE_FLAG</span>) <span class="op">!</span><span class="op">=</span> (<span class="ident">b</span> <span class="op">&lt;</span> <span class="ident">utils</span>::<span class="ident">SEQUENCE_LOCKTIME_TYPE_FLAG</span>) {
1712             <span class="prelude-val">Err</span>(<span class="ident">PolicyError</span>::<span class="ident">MixedTimelockUnits</span>)
1713         } <span class="kw">else</span> {
1714             <span class="prelude-val">Ok</span>(<span class="ident">max</span>(<span class="ident">a</span>, <span class="ident">b</span>))
1715         }
1716     }
1717
1718     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">merge</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">Condition</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span>, <span class="ident">PolicyError</span><span class="op">&gt;</span> {
1719         <span class="kw">match</span> (<span class="self">self</span>.<span class="ident">csv</span>, <span class="ident">other</span>.<span class="ident">csv</span>) {
1720             (<span class="prelude-val">Some</span>(<span class="ident">a</span>), <span class="prelude-val">Some</span>(<span class="ident">b</span>)) <span class="op">=</span><span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">csv</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="self">Self</span>::<span class="ident">merge_nsequence</span>(<span class="ident">a</span>, <span class="ident">b</span>)<span class="question-mark">?</span>),
1721             (<span class="prelude-val">None</span>, <span class="ident">any</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">csv</span> <span class="op">=</span> <span class="ident">any</span>,
1722             <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> {}
1723         }
1724
1725         <span class="kw">match</span> (<span class="self">self</span>.<span class="ident">timelock</span>, <span class="ident">other</span>.<span class="ident">timelock</span>) {
1726             (<span class="prelude-val">Some</span>(<span class="ident">a</span>), <span class="prelude-val">Some</span>(<span class="ident">b</span>)) <span class="op">=</span><span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">timelock</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="self">Self</span>::<span class="ident">merge_nlocktime</span>(<span class="ident">a</span>, <span class="ident">b</span>)<span class="question-mark">?</span>),
1727             (<span class="prelude-val">None</span>, <span class="ident">any</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="self">self</span>.<span class="ident">timelock</span> <span class="op">=</span> <span class="ident">any</span>,
1728             <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> {}
1729         }
1730
1731         <span class="prelude-val">Ok</span>(<span class="self">self</span>)
1732     }
1733
1734     <span class="doccomment">/// Returns `true` if there are no extra conditions to verify</span>
1735     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_null</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
1736         <span class="self">self</span>.<span class="ident">csv</span>.<span class="ident">is_none</span>() <span class="op">&amp;&amp;</span> <span class="self">self</span>.<span class="ident">timelock</span>.<span class="ident">is_none</span>()
1737     }
1738 }
1739
1740 <span class="doccomment">/// Errors that can happen while extracting and manipulating policies</span>
1741 <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
1742 <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">PolicyError</span> {
1743     <span class="doccomment">/// Not enough items are selected to satisfy a [`SatisfiableItem::Thresh`]</span>
1744     <span class="ident">NotEnoughItemsSelected</span>(<span class="ident">String</span>),
1745     <span class="doccomment">/// Too many items are selected to satisfy a [`SatisfiableItem::Thresh`]</span>
1746     <span class="ident">TooManyItemsSelected</span>(<span class="ident">String</span>),
1747     <span class="doccomment">/// Index out of range for an item to satisfy a [`SatisfiableItem::Thresh`]</span>
1748     <span class="ident">IndexOutOfRange</span>(<span class="ident">usize</span>),
1749     <span class="doccomment">/// Can not add to an item that is [`Satisfaction::None`] or [`Satisfaction::Complete`]</span>
1750     <span class="ident">AddOnLeaf</span>,
1751     <span class="doccomment">/// Can not add to an item that is [`Satisfaction::PartialComplete`]</span>
1752     <span class="ident">AddOnPartialComplete</span>,
1753     <span class="doccomment">/// Can not merge CSV or timelock values unless both are less than or both are equal or greater than 500_000_000</span>
1754     <span class="ident">MixedTimelockUnits</span>,
1755     <span class="doccomment">/// Incompatible conditions (not currently used)</span>
1756     <span class="ident">IncompatibleConditions</span>,
1757 }
1758
1759 <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">PolicyError</span> {
1760     <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span><span class="op">&lt;</span><span class="lifetime">&#39;_</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
1761         <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;{:?}&quot;</span>, <span class="self">self</span>)
1762     }
1763 }
1764
1765 <span class="kw">impl</span> <span class="ident">std</span>::<span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">PolicyError</span> {}
1766
1767 <span class="kw">impl</span> <span class="ident">Policy</span> {
1768     <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">item</span>: <span class="ident">SatisfiableItem</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
1769         <span class="ident">Policy</span> {
1770             <span class="ident">id</span>: <span class="ident">item</span>.<span class="ident">id</span>(),
1771             <span class="ident">item</span>,
1772             <span class="ident">satisfaction</span>: <span class="ident">Satisfaction</span>::<span class="prelude-val">None</span>,
1773             <span class="ident">contribution</span>: <span class="ident">Satisfaction</span>::<span class="prelude-val">None</span>,
1774         }
1775     }
1776
1777     <span class="kw">fn</span> <span class="ident">make_and</span>(<span class="ident">a</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Policy</span><span class="op">&gt;</span>, <span class="ident">b</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Policy</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Policy</span><span class="op">&gt;</span>, <span class="ident">PolicyError</span><span class="op">&gt;</span> {
1778         <span class="kw">match</span> (<span class="ident">a</span>, <span class="ident">b</span>) {
1779             (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
1780             (<span class="prelude-val">Some</span>(<span class="ident">x</span>), <span class="prelude-val">None</span>) <span class="op">|</span> (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="ident">x</span>)) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">x</span>)),
1781             (<span class="prelude-val">Some</span>(<span class="ident">a</span>), <span class="prelude-val">Some</span>(<span class="ident">b</span>)) <span class="op">=</span><span class="op">&gt;</span> <span class="self">Self</span>::<span class="ident">make_thresh</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">a</span>, <span class="ident">b</span>], <span class="number">2</span>),
1782         }
1783     }
1784
1785     <span class="kw">fn</span> <span class="ident">make_or</span>(<span class="ident">a</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Policy</span><span class="op">&gt;</span>, <span class="ident">b</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Policy</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Policy</span><span class="op">&gt;</span>, <span class="ident">PolicyError</span><span class="op">&gt;</span> {
1786         <span class="kw">match</span> (<span class="ident">a</span>, <span class="ident">b</span>) {
1787             (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
1788             (<span class="prelude-val">Some</span>(<span class="ident">x</span>), <span class="prelude-val">None</span>) <span class="op">|</span> (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="ident">x</span>)) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">x</span>)),
1789             (<span class="prelude-val">Some</span>(<span class="ident">a</span>), <span class="prelude-val">Some</span>(<span class="ident">b</span>)) <span class="op">=</span><span class="op">&gt;</span> <span class="self">Self</span>::<span class="ident">make_thresh</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">a</span>, <span class="ident">b</span>], <span class="number">1</span>),
1790         }
1791     }
1792
1793     <span class="kw">fn</span> <span class="ident">make_thresh</span>(<span class="ident">items</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Policy</span><span class="op">&gt;</span>, <span class="ident">threshold</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Policy</span><span class="op">&gt;</span>, <span class="ident">PolicyError</span><span class="op">&gt;</span> {
1794         <span class="kw">if</span> <span class="ident">threshold</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
1795             <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>);
1796         }
1797
1798         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">contribution</span> <span class="op">=</span> <span class="ident">Satisfaction</span>::<span class="ident">Partial</span> {
1799             <span class="ident">n</span>: <span class="ident">items</span>.<span class="ident">len</span>(),
1800             <span class="ident">m</span>: <span class="ident">threshold</span>,
1801             <span class="ident">items</span>: <span class="macro">vec</span><span class="macro">!</span>[],
1802             <span class="ident">conditions</span>: <span class="ident">Default</span>::<span class="ident">default</span>(),
1803             <span class="ident">sorted</span>: <span class="prelude-val">None</span>,
1804         };
1805         <span class="kw">for</span> (<span class="ident">index</span>, <span class="ident">item</span>) <span class="kw">in</span> <span class="ident">items</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
1806             <span class="ident">contribution</span>.<span class="ident">add</span>(<span class="kw-2">&amp;</span><span class="ident">item</span>.<span class="ident">contribution</span>, <span class="ident">index</span>)<span class="question-mark">?</span>;
1807         }
1808         <span class="ident">contribution</span>.<span class="ident">finalize</span>()<span class="question-mark">?</span>;
1809
1810         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">policy</span>: <span class="ident">Policy</span> <span class="op">=</span> <span class="ident">SatisfiableItem</span>::<span class="ident">Thresh</span> { <span class="ident">items</span>, <span class="ident">threshold</span> }.<span class="ident">into</span>();
1811         <span class="ident">policy</span>.<span class="ident">contribution</span> <span class="op">=</span> <span class="ident">contribution</span>;
1812
1813         <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">policy</span>))
1814     }
1815
1816     <span class="kw">fn</span> <span class="ident">make_multisig</span>(
1817         <span class="ident">keys</span>: <span class="kw-2">&amp;</span>[<span class="ident">DescriptorPublicKey</span>],
1818         <span class="ident">signers</span>: <span class="kw-2">&amp;</span><span class="ident">SignersContainer</span>,
1819         <span class="ident">threshold</span>: <span class="ident">usize</span>,
1820         <span class="ident">sorted</span>: <span class="ident">bool</span>,
1821         <span class="ident">secp</span>: <span class="kw-2">&amp;</span><span class="ident">SecpCtx</span>,
1822     ) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Policy</span><span class="op">&gt;</span>, <span class="ident">PolicyError</span><span class="op">&gt;</span> {
1823         <span class="kw">if</span> <span class="ident">threshold</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
1824             <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>);
1825         }
1826
1827         <span class="kw">let</span> <span class="ident">parsed_keys</span> <span class="op">=</span> <span class="ident">keys</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">k</span><span class="op">|</span> <span class="ident">PKOrF</span>::<span class="ident">from_key</span>(<span class="ident">k</span>, <span class="ident">secp</span>)).<span class="ident">collect</span>();
1828
1829         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">contribution</span> <span class="op">=</span> <span class="ident">Satisfaction</span>::<span class="ident">Partial</span> {
1830             <span class="ident">n</span>: <span class="ident">keys</span>.<span class="ident">len</span>(),
1831             <span class="ident">m</span>: <span class="ident">threshold</span>,
1832             <span class="ident">items</span>: <span class="macro">vec</span><span class="macro">!</span>[],
1833             <span class="ident">conditions</span>: <span class="ident">Default</span>::<span class="ident">default</span>(),
1834             <span class="ident">sorted</span>: <span class="prelude-val">Some</span>(<span class="ident">sorted</span>),
1835         };
1836         <span class="kw">for</span> (<span class="ident">index</span>, <span class="ident">key</span>) <span class="kw">in</span> <span class="ident">keys</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
1837             <span class="kw">if</span> <span class="ident">signers</span>.<span class="ident">find</span>(<span class="ident">signer_id</span>(<span class="ident">key</span>, <span class="ident">secp</span>)).<span class="ident">is_some</span>() {
1838                 <span class="ident">contribution</span>.<span class="ident">add</span>(
1839                     <span class="kw-2">&amp;</span><span class="ident">Satisfaction</span>::<span class="ident">Complete</span> {
1840                         <span class="ident">condition</span>: <span class="ident">Default</span>::<span class="ident">default</span>(),
1841                     },
1842                     <span class="ident">index</span>,
1843                 )<span class="question-mark">?</span>;
1844             }
1845         }
1846         <span class="ident">contribution</span>.<span class="ident">finalize</span>()<span class="question-mark">?</span>;
1847
1848         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">policy</span>: <span class="ident">Policy</span> <span class="op">=</span> <span class="ident">SatisfiableItem</span>::<span class="ident">Multisig</span> {
1849             <span class="ident">keys</span>: <span class="ident">parsed_keys</span>,
1850             <span class="ident">threshold</span>,
1851         }
1852         .<span class="ident">into</span>();
1853         <span class="ident">policy</span>.<span class="ident">contribution</span> <span class="op">=</span> <span class="ident">contribution</span>;
1854
1855         <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">policy</span>))
1856     }
1857
1858     <span class="doccomment">/// Return whether or not a specific path in the policy tree is required to unambiguously</span>
1859     <span class="doccomment">/// create a transaction</span>
1860     <span class="doccomment">///</span>
1861     <span class="doccomment">/// What this means is that for some spending policies the user should select which paths in</span>
1862     <span class="doccomment">/// the tree it intends to satisfy while signing, because the transaction must be created differently based</span>
1863     <span class="doccomment">/// on that.</span>
1864     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">requires_path</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
1865         <span class="self">self</span>.<span class="ident">get_condition</span>(<span class="kw-2">&amp;</span><span class="ident">BTreeMap</span>::<span class="ident">new</span>()).<span class="ident">is_err</span>()
1866     }
1867
1868     <span class="doccomment">/// Return the conditions that are set by the spending policy for a given path in the</span>
1869     <span class="doccomment">/// policy tree</span>
1870     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_condition</span>(
1871         <span class="kw-2">&amp;</span><span class="self">self</span>,
1872         <span class="ident">path</span>: <span class="kw-2">&amp;</span><span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span><span class="op">&gt;</span>,
1873     ) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Condition</span>, <span class="ident">PolicyError</span><span class="op">&gt;</span> {
1874         <span class="comment">// if items.len() == threshold, selected can be omitted and we take all of them by default</span>
1875         <span class="kw">let</span> <span class="ident">default</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">item</span> {
1876             <span class="ident">SatisfiableItem</span>::<span class="ident">Thresh</span> { <span class="ident">items</span>, <span class="ident">threshold</span> } <span class="kw">if</span> <span class="ident">items</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="kw-2">*</span><span class="ident">threshold</span> <span class="op">=</span><span class="op">&gt;</span> {
1877                 (<span class="number">0</span>..<span class="kw-2">*</span><span class="ident">threshold</span>).<span class="ident">collect</span>()
1878             }
1879             <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro">vec</span><span class="macro">!</span>[],
1880         };
1881         <span class="kw">let</span> <span class="ident">selected</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">path</span>.<span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">id</span>) {
1882             <span class="kw">_</span> <span class="kw">if</span> <span class="op">!</span><span class="ident">default</span>.<span class="ident">is_empty</span>() <span class="op">=</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">default</span>,
1883             <span class="prelude-val">Some</span>(<span class="ident">arr</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">arr</span>,
1884             <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">default</span>,
1885         };
1886
1887         <span class="kw">match</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">item</span> {
1888             <span class="ident">SatisfiableItem</span>::<span class="ident">Thresh</span> { <span class="ident">items</span>, <span class="ident">threshold</span> } <span class="op">=</span><span class="op">&gt;</span> {
1889                 <span class="kw">let</span> <span class="ident">mapped_req</span> <span class="op">=</span> <span class="ident">items</span>
1890                     .<span class="ident">iter</span>()
1891                     .<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="ident">i</span>.<span class="ident">get_condition</span>(<span class="ident">path</span>))
1892                     .<span class="ident">collect</span>::<span class="op">&lt;</span><span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span>, <span class="kw">_</span><span class="op">&gt;</span><span class="op">&gt;</span>()<span class="question-mark">?</span>;
1893
1894                 <span class="comment">// if all the requirements are null we don&#39;t care about `selected` because there</span>
1895                 <span class="comment">// are no requirements</span>
1896                 <span class="kw">if</span> <span class="ident">mapped_req</span>.<span class="ident">iter</span>().<span class="ident">all</span>(<span class="ident">Condition</span>::<span class="ident">is_null</span>) {
1897                     <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Condition</span>::<span class="ident">default</span>());
1898                 }
1899
1900                 <span class="comment">// if we have something, make sure we have enough items. note that the user can set</span>
1901                 <span class="comment">// an empty value for this step in case of n-of-n, because `selected` is set to all</span>
1902                 <span class="comment">// the elements above</span>
1903                 <span class="kw">match</span> <span class="ident">selected</span>.<span class="ident">len</span>().<span class="ident">cmp</span>(<span class="ident">threshold</span>) {
1904                     <span class="ident">Ordering</span>::<span class="ident">Less</span> <span class="op">=</span><span class="op">&gt;</span> {
1905                         <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">PolicyError</span>::<span class="ident">NotEnoughItemsSelected</span>(<span class="self">self</span>.<span class="ident">id</span>.<span class="ident">clone</span>()))
1906                     }
1907                     <span class="ident">Ordering</span>::<span class="ident">Greater</span> <span class="op">=</span><span class="op">&gt;</span> {
1908                         <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">PolicyError</span>::<span class="ident">TooManyItemsSelected</span>(<span class="self">self</span>.<span class="ident">id</span>.<span class="ident">clone</span>()))
1909                     }
1910                     <span class="ident">Ordering</span>::<span class="ident">Equal</span> <span class="op">=</span><span class="op">&gt;</span> (),
1911                 }
1912
1913                 <span class="comment">// check the selected items, see if there are conflicting requirements</span>
1914                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">requirements</span> <span class="op">=</span> <span class="ident">Condition</span>::<span class="ident">default</span>();
1915                 <span class="kw">for</span> <span class="ident">item_index</span> <span class="kw">in</span> <span class="ident">selected</span> {
1916                     <span class="ident">requirements</span> <span class="op">=</span> <span class="ident">requirements</span>.<span class="ident">merge</span>(
1917                         <span class="ident">mapped_req</span>
1918                             .<span class="ident">get</span>(<span class="kw-2">*</span><span class="ident">item_index</span>)
1919                             .<span class="ident">ok_or</span>(<span class="ident">PolicyError</span>::<span class="ident">IndexOutOfRange</span>(<span class="kw-2">*</span><span class="ident">item_index</span>))<span class="question-mark">?</span>,
1920                     )<span class="question-mark">?</span>;
1921                 }
1922
1923                 <span class="prelude-val">Ok</span>(<span class="ident">requirements</span>)
1924             }
1925             <span class="kw">_</span> <span class="kw">if</span> <span class="op">!</span><span class="ident">selected</span>.<span class="ident">is_empty</span>() <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">PolicyError</span>::<span class="ident">TooManyItemsSelected</span>(<span class="self">self</span>.<span class="ident">id</span>.<span class="ident">clone</span>())),
1926             <span class="ident">SatisfiableItem</span>::<span class="ident">AbsoluteTimelock</span> { <span class="ident">value</span> } <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">Condition</span> {
1927                 <span class="ident">csv</span>: <span class="prelude-val">None</span>,
1928                 <span class="ident">timelock</span>: <span class="prelude-val">Some</span>(<span class="kw-2">*</span><span class="ident">value</span>),
1929             }),
1930             <span class="ident">SatisfiableItem</span>::<span class="ident">RelativeTimelock</span> { <span class="ident">value</span> } <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">Condition</span> {
1931                 <span class="ident">csv</span>: <span class="prelude-val">Some</span>(<span class="kw-2">*</span><span class="ident">value</span>),
1932                 <span class="ident">timelock</span>: <span class="prelude-val">None</span>,
1933             }),
1934             <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">Condition</span>::<span class="ident">default</span>()),
1935         }
1936     }
1937 }
1938
1939 <span class="kw">impl</span> <span class="ident">From</span><span class="op">&lt;</span><span class="ident">SatisfiableItem</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Policy</span> {
1940     <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">other</span>: <span class="ident">SatisfiableItem</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="self">Self</span> {
1941         <span class="self">Self</span>::<span class="ident">new</span>(<span class="ident">other</span>)
1942     }
1943 }
1944
1945 <span class="kw">fn</span> <span class="ident">signer_id</span>(<span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">DescriptorPublicKey</span>, <span class="ident">secp</span>: <span class="kw-2">&amp;</span><span class="ident">SecpCtx</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">SignerId</span> {
1946     <span class="kw">match</span> <span class="ident">key</span> {
1947         <span class="ident">DescriptorPublicKey</span>::<span class="ident">SinglePub</span>(<span class="ident">pubkey</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">pubkey</span>.<span class="ident">key</span>.<span class="ident">to_pubkeyhash</span>().<span class="ident">into</span>(),
1948         <span class="ident">DescriptorPublicKey</span>::<span class="ident">XPub</span>(<span class="ident">xpub</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">xpub</span>.<span class="ident">root_fingerprint</span>(<span class="ident">secp</span>).<span class="ident">into</span>(),
1949     }
1950 }
1951
1952 <span class="kw">fn</span> <span class="ident">signature</span>(<span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">DescriptorPublicKey</span>, <span class="ident">signers</span>: <span class="kw-2">&amp;</span><span class="ident">SignersContainer</span>, <span class="ident">secp</span>: <span class="kw-2">&amp;</span><span class="ident">SecpCtx</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Policy</span> {
1953     <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">policy</span>: <span class="ident">Policy</span> <span class="op">=</span> <span class="ident">SatisfiableItem</span>::<span class="ident">Signature</span>(<span class="ident">PKOrF</span>::<span class="ident">from_key</span>(<span class="ident">key</span>, <span class="ident">secp</span>)).<span class="ident">into</span>();
1954
1955     <span class="ident">policy</span>.<span class="ident">contribution</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">signers</span>.<span class="ident">find</span>(<span class="ident">signer_id</span>(<span class="ident">key</span>, <span class="ident">secp</span>)).<span class="ident">is_some</span>() {
1956         <span class="ident">Satisfaction</span>::<span class="ident">Complete</span> {
1957             <span class="ident">condition</span>: <span class="ident">Default</span>::<span class="ident">default</span>(),
1958         }
1959     } <span class="kw">else</span> {
1960         <span class="ident">Satisfaction</span>::<span class="prelude-val">None</span>
1961     };
1962
1963     <span class="ident">policy</span>
1964 }
1965
1966 <span class="kw">fn</span> <span class="ident">signature_key</span>(
1967     <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="op">&lt;</span><span class="ident">DescriptorPublicKey</span> <span class="kw">as</span> <span class="ident">MiniscriptKey</span><span class="op">&gt;</span>::<span class="ident">Hash</span>,
1968     <span class="ident">signers</span>: <span class="kw-2">&amp;</span><span class="ident">SignersContainer</span>,
1969     <span class="ident">secp</span>: <span class="kw-2">&amp;</span><span class="ident">SecpCtx</span>,
1970 ) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Policy</span> {
1971     <span class="kw">let</span> <span class="ident">deriv_ctx</span> <span class="op">=</span> <span class="ident">descriptor_to_pk_ctx</span>(<span class="ident">secp</span>);
1972     <span class="kw">let</span> <span class="ident">key_hash</span> <span class="op">=</span> <span class="ident">key</span>.<span class="ident">to_public_key</span>(<span class="ident">deriv_ctx</span>).<span class="ident">to_pubkeyhash</span>();
1973     <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">policy</span>: <span class="ident">Policy</span> <span class="op">=</span> <span class="ident">SatisfiableItem</span>::<span class="ident">Signature</span>(<span class="ident">PKOrF</span>::<span class="ident">from_key_hash</span>(<span class="ident">key_hash</span>)).<span class="ident">into</span>();
1974
1975     <span class="kw">if</span> <span class="ident">signers</span>.<span class="ident">find</span>(<span class="ident">SignerId</span>::<span class="ident">PkHash</span>(<span class="ident">key_hash</span>)).<span class="ident">is_some</span>() {
1976         <span class="ident">policy</span>.<span class="ident">contribution</span> <span class="op">=</span> <span class="ident">Satisfaction</span>::<span class="ident">Complete</span> {
1977             <span class="ident">condition</span>: <span class="ident">Default</span>::<span class="ident">default</span>(),
1978         }
1979     }
1980
1981     <span class="ident">policy</span>
1982 }
1983
1984 <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">Ctx</span>: <span class="ident">ScriptContext</span><span class="op">&gt;</span> <span class="ident">ExtractPolicy</span> <span class="kw">for</span> <span class="ident">Miniscript</span><span class="op">&lt;</span><span class="ident">DescriptorPublicKey</span>, <span class="ident">Ctx</span><span class="op">&gt;</span> {
1985     <span class="kw">fn</span> <span class="ident">extract_policy</span>(
1986         <span class="kw-2">&amp;</span><span class="self">self</span>,
1987         <span class="ident">signers</span>: <span class="kw-2">&amp;</span><span class="ident">SignersContainer</span>,
1988         <span class="ident">secp</span>: <span class="kw-2">&amp;</span><span class="ident">SecpCtx</span>,
1989     ) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Policy</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
1990         <span class="prelude-val">Ok</span>(<span class="kw">match</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">node</span> {
1991             <span class="comment">// Leaves</span>
1992             <span class="ident">Terminal</span>::<span class="ident">True</span> <span class="op">|</span> <span class="ident">Terminal</span>::<span class="ident">False</span> <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">None</span>,
1993             <span class="ident">Terminal</span>::<span class="ident">PkK</span>(<span class="ident">pubkey</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">signature</span>(<span class="ident">pubkey</span>, <span class="ident">signers</span>, <span class="ident">secp</span>)),
1994             <span class="ident">Terminal</span>::<span class="ident">PkH</span>(<span class="ident">pubkey_hash</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">signature_key</span>(<span class="ident">pubkey_hash</span>, <span class="ident">signers</span>, <span class="ident">secp</span>)),
1995             <span class="ident">Terminal</span>::<span class="ident">After</span>(<span class="ident">value</span>) <span class="op">=</span><span class="op">&gt;</span> {
1996                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">policy</span>: <span class="ident">Policy</span> <span class="op">=</span> <span class="ident">SatisfiableItem</span>::<span class="ident">AbsoluteTimelock</span> { <span class="ident">value</span>: <span class="kw-2">*</span><span class="ident">value</span> }.<span class="ident">into</span>();
1997                 <span class="ident">policy</span>.<span class="ident">contribution</span> <span class="op">=</span> <span class="ident">Satisfaction</span>::<span class="ident">Complete</span> {
1998                     <span class="ident">condition</span>: <span class="ident">Condition</span> {
1999                         <span class="ident">timelock</span>: <span class="prelude-val">Some</span>(<span class="kw-2">*</span><span class="ident">value</span>),
2000                         <span class="ident">csv</span>: <span class="prelude-val">None</span>,
2001                     },
2002                 };
2003
2004                 <span class="prelude-val">Some</span>(<span class="ident">policy</span>)
2005             }
2006             <span class="ident">Terminal</span>::<span class="ident">Older</span>(<span class="ident">value</span>) <span class="op">=</span><span class="op">&gt;</span> {
2007                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">policy</span>: <span class="ident">Policy</span> <span class="op">=</span> <span class="ident">SatisfiableItem</span>::<span class="ident">RelativeTimelock</span> { <span class="ident">value</span>: <span class="kw-2">*</span><span class="ident">value</span> }.<span class="ident">into</span>();
2008                 <span class="ident">policy</span>.<span class="ident">contribution</span> <span class="op">=</span> <span class="ident">Satisfaction</span>::<span class="ident">Complete</span> {
2009                     <span class="ident">condition</span>: <span class="ident">Condition</span> {
2010                         <span class="ident">timelock</span>: <span class="prelude-val">None</span>,
2011                         <span class="ident">csv</span>: <span class="prelude-val">Some</span>(<span class="kw-2">*</span><span class="ident">value</span>),
2012                     },
2013                 };
2014
2015                 <span class="prelude-val">Some</span>(<span class="ident">policy</span>)
2016             }
2017             <span class="ident">Terminal</span>::<span class="ident">Sha256</span>(<span class="ident">hash</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">SatisfiableItem</span>::<span class="ident">SHA256Preimage</span> { <span class="ident">hash</span>: <span class="kw-2">*</span><span class="ident">hash</span> }.<span class="ident">into</span>()),
2018             <span class="ident">Terminal</span>::<span class="ident">Hash256</span>(<span class="ident">hash</span>) <span class="op">=</span><span class="op">&gt;</span> {
2019                 <span class="prelude-val">Some</span>(<span class="ident">SatisfiableItem</span>::<span class="ident">HASH256Preimage</span> { <span class="ident">hash</span>: <span class="kw-2">*</span><span class="ident">hash</span> }.<span class="ident">into</span>())
2020             }
2021             <span class="ident">Terminal</span>::<span class="ident">Ripemd160</span>(<span class="ident">hash</span>) <span class="op">=</span><span class="op">&gt;</span> {
2022                 <span class="prelude-val">Some</span>(<span class="ident">SatisfiableItem</span>::<span class="ident">RIPEMD160Preimage</span> { <span class="ident">hash</span>: <span class="kw-2">*</span><span class="ident">hash</span> }.<span class="ident">into</span>())
2023             }
2024             <span class="ident">Terminal</span>::<span class="ident">Hash160</span>(<span class="ident">hash</span>) <span class="op">=</span><span class="op">&gt;</span> {
2025                 <span class="prelude-val">Some</span>(<span class="ident">SatisfiableItem</span>::<span class="ident">HASH160Preimage</span> { <span class="ident">hash</span>: <span class="kw-2">*</span><span class="ident">hash</span> }.<span class="ident">into</span>())
2026             }
2027             <span class="ident">Terminal</span>::<span class="ident">Multi</span>(<span class="ident">k</span>, <span class="ident">pks</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">Policy</span>::<span class="ident">make_multisig</span>(<span class="ident">pks</span>, <span class="ident">signers</span>, <span class="kw-2">*</span><span class="ident">k</span>, <span class="bool-val">false</span>, <span class="ident">secp</span>)<span class="question-mark">?</span>,
2028             <span class="comment">// Identities</span>
2029             <span class="ident">Terminal</span>::<span class="ident">Alt</span>(<span class="ident">inner</span>)
2030             <span class="op">|</span> <span class="ident">Terminal</span>::<span class="ident">Swap</span>(<span class="ident">inner</span>)
2031             <span class="op">|</span> <span class="ident">Terminal</span>::<span class="ident">Check</span>(<span class="ident">inner</span>)
2032             <span class="op">|</span> <span class="ident">Terminal</span>::<span class="ident">DupIf</span>(<span class="ident">inner</span>)
2033             <span class="op">|</span> <span class="ident">Terminal</span>::<span class="ident">Verify</span>(<span class="ident">inner</span>)
2034             <span class="op">|</span> <span class="ident">Terminal</span>::<span class="ident">NonZero</span>(<span class="ident">inner</span>)
2035             <span class="op">|</span> <span class="ident">Terminal</span>::<span class="ident">ZeroNotEqual</span>(<span class="ident">inner</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">inner</span>.<span class="ident">extract_policy</span>(<span class="ident">signers</span>, <span class="ident">secp</span>)<span class="question-mark">?</span>,
2036             <span class="comment">// Complex policies</span>
2037             <span class="ident">Terminal</span>::<span class="ident">AndV</span>(<span class="ident">a</span>, <span class="ident">b</span>) <span class="op">|</span> <span class="ident">Terminal</span>::<span class="ident">AndB</span>(<span class="ident">a</span>, <span class="ident">b</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">Policy</span>::<span class="ident">make_and</span>(
2038                 <span class="ident">a</span>.<span class="ident">extract_policy</span>(<span class="ident">signers</span>, <span class="ident">secp</span>)<span class="question-mark">?</span>,
2039                 <span class="ident">b</span>.<span class="ident">extract_policy</span>(<span class="ident">signers</span>, <span class="ident">secp</span>)<span class="question-mark">?</span>,
2040             )<span class="question-mark">?</span>,
2041             <span class="ident">Terminal</span>::<span class="ident">AndOr</span>(<span class="ident">x</span>, <span class="ident">y</span>, <span class="ident">z</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">Policy</span>::<span class="ident">make_or</span>(
2042                 <span class="ident">Policy</span>::<span class="ident">make_and</span>(
2043                     <span class="ident">x</span>.<span class="ident">extract_policy</span>(<span class="ident">signers</span>, <span class="ident">secp</span>)<span class="question-mark">?</span>,
2044                     <span class="ident">y</span>.<span class="ident">extract_policy</span>(<span class="ident">signers</span>, <span class="ident">secp</span>)<span class="question-mark">?</span>,
2045                 )<span class="question-mark">?</span>,
2046                 <span class="ident">z</span>.<span class="ident">extract_policy</span>(<span class="ident">signers</span>, <span class="ident">secp</span>)<span class="question-mark">?</span>,
2047             )<span class="question-mark">?</span>,
2048             <span class="ident">Terminal</span>::<span class="ident">OrB</span>(<span class="ident">a</span>, <span class="ident">b</span>)
2049             <span class="op">|</span> <span class="ident">Terminal</span>::<span class="ident">OrD</span>(<span class="ident">a</span>, <span class="ident">b</span>)
2050             <span class="op">|</span> <span class="ident">Terminal</span>::<span class="ident">OrC</span>(<span class="ident">a</span>, <span class="ident">b</span>)
2051             <span class="op">|</span> <span class="ident">Terminal</span>::<span class="ident">OrI</span>(<span class="ident">a</span>, <span class="ident">b</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">Policy</span>::<span class="ident">make_or</span>(
2052                 <span class="ident">a</span>.<span class="ident">extract_policy</span>(<span class="ident">signers</span>, <span class="ident">secp</span>)<span class="question-mark">?</span>,
2053                 <span class="ident">b</span>.<span class="ident">extract_policy</span>(<span class="ident">signers</span>, <span class="ident">secp</span>)<span class="question-mark">?</span>,
2054             )<span class="question-mark">?</span>,
2055             <span class="ident">Terminal</span>::<span class="ident">Thresh</span>(<span class="ident">k</span>, <span class="ident">nodes</span>) <span class="op">=</span><span class="op">&gt;</span> {
2056                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">threshold</span> <span class="op">=</span> <span class="kw-2">*</span><span class="ident">k</span>;
2057                 <span class="kw">let</span> <span class="ident">mapped</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">nodes</span>
2058                     .<span class="ident">iter</span>()
2059                     .<span class="ident">map</span>(<span class="op">|</span><span class="ident">n</span><span class="op">|</span> <span class="ident">n</span>.<span class="ident">extract_policy</span>(<span class="ident">signers</span>, <span class="ident">secp</span>))
2060                     .<span class="ident">collect</span>::<span class="op">&lt;</span><span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span>, <span class="kw">_</span><span class="op">&gt;</span><span class="op">&gt;</span>()<span class="question-mark">?</span>
2061                     .<span class="ident">into_iter</span>()
2062                     .<span class="ident">filter_map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>)
2063                     .<span class="ident">collect</span>();
2064
2065                 <span class="kw">if</span> <span class="ident">mapped</span>.<span class="ident">len</span>() <span class="op">&lt;</span> <span class="ident">nodes</span>.<span class="ident">len</span>() {
2066                     <span class="ident">threshold</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">threshold</span>.<span class="ident">checked_sub</span>(<span class="ident">nodes</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">mapped</span>.<span class="ident">len</span>()) {
2067                         <span class="prelude-val">None</span> <span class="op">=</span><span class="op">&gt;</span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>),
2068                         <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">x</span>,
2069                     };
2070                 }
2071
2072                 <span class="ident">Policy</span>::<span class="ident">make_thresh</span>(<span class="ident">mapped</span>, <span class="ident">threshold</span>)<span class="question-mark">?</span>
2073             }
2074         })
2075     }
2076 }
2077
2078 <span class="kw">impl</span> <span class="ident">ExtractPolicy</span> <span class="kw">for</span> <span class="ident">Descriptor</span><span class="op">&lt;</span><span class="ident">DescriptorPublicKey</span><span class="op">&gt;</span> {
2079     <span class="kw">fn</span> <span class="ident">extract_policy</span>(
2080         <span class="kw-2">&amp;</span><span class="self">self</span>,
2081         <span class="ident">signers</span>: <span class="kw-2">&amp;</span><span class="ident">SignersContainer</span>,
2082         <span class="ident">secp</span>: <span class="kw-2">&amp;</span><span class="ident">SecpCtx</span>,
2083     ) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Policy</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
2084         <span class="kw">fn</span> <span class="ident">make_sortedmulti</span><span class="op">&lt;</span><span class="ident">Ctx</span>: <span class="ident">ScriptContext</span><span class="op">&gt;</span>(
2085             <span class="ident">keys</span>: <span class="kw-2">&amp;</span><span class="ident">SortedMultiVec</span><span class="op">&lt;</span><span class="ident">DescriptorPublicKey</span>, <span class="ident">Ctx</span><span class="op">&gt;</span>,
2086             <span class="ident">signers</span>: <span class="kw-2">&amp;</span><span class="ident">SignersContainer</span>,
2087             <span class="ident">secp</span>: <span class="kw-2">&amp;</span><span class="ident">SecpCtx</span>,
2088         ) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Policy</span><span class="op">&gt;</span>, <span class="ident">Error</span><span class="op">&gt;</span> {
2089             <span class="prelude-val">Ok</span>(<span class="ident">Policy</span>::<span class="ident">make_multisig</span>(
2090                 <span class="ident">keys</span>.<span class="ident">pks</span>.<span class="ident">as_ref</span>(),
2091                 <span class="ident">signers</span>,
2092                 <span class="ident">keys</span>.<span class="ident">k</span>,
2093                 <span class="bool-val">true</span>,
2094                 <span class="ident">secp</span>,
2095             )<span class="question-mark">?</span>)
2096         }
2097
2098         <span class="kw">match</span> <span class="self">self</span> {
2099             <span class="ident">Descriptor</span>::<span class="ident">Pk</span>(<span class="ident">pubkey</span>)
2100             <span class="op">|</span> <span class="ident">Descriptor</span>::<span class="ident">Pkh</span>(<span class="ident">pubkey</span>)
2101             <span class="op">|</span> <span class="ident">Descriptor</span>::<span class="ident">Wpkh</span>(<span class="ident">pubkey</span>)
2102             <span class="op">|</span> <span class="ident">Descriptor</span>::<span class="ident">ShWpkh</span>(<span class="ident">pubkey</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">signature</span>(<span class="ident">pubkey</span>, <span class="ident">signers</span>, <span class="ident">secp</span>))),
2103             <span class="ident">Descriptor</span>::<span class="ident">Bare</span>(<span class="ident">inner</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">inner</span>.<span class="ident">extract_policy</span>(<span class="ident">signers</span>, <span class="ident">secp</span>)<span class="question-mark">?</span>),
2104             <span class="ident">Descriptor</span>::<span class="ident">Sh</span>(<span class="ident">inner</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">inner</span>.<span class="ident">extract_policy</span>(<span class="ident">signers</span>, <span class="ident">secp</span>)<span class="question-mark">?</span>),
2105             <span class="ident">Descriptor</span>::<span class="ident">Wsh</span>(<span class="ident">inner</span>) <span class="op">|</span> <span class="ident">Descriptor</span>::<span class="ident">ShWsh</span>(<span class="ident">inner</span>) <span class="op">=</span><span class="op">&gt;</span> {
2106                 <span class="prelude-val">Ok</span>(<span class="ident">inner</span>.<span class="ident">extract_policy</span>(<span class="ident">signers</span>, <span class="ident">secp</span>)<span class="question-mark">?</span>)
2107             }
2108
2109             <span class="comment">// `sortedmulti()` is handled separately</span>
2110             <span class="ident">Descriptor</span>::<span class="ident">ShSortedMulti</span>(<span class="ident">keys</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="ident">make_sortedmulti</span>(<span class="kw-2">&amp;</span><span class="ident">keys</span>, <span class="ident">signers</span>, <span class="ident">secp</span>),
2111             <span class="ident">Descriptor</span>::<span class="ident">ShWshSortedMulti</span>(<span class="ident">keys</span>) <span class="op">|</span> <span class="ident">Descriptor</span>::<span class="ident">WshSortedMulti</span>(<span class="ident">keys</span>) <span class="op">=</span><span class="op">&gt;</span> {
2112                 <span class="ident">make_sortedmulti</span>(<span class="kw-2">&amp;</span><span class="ident">keys</span>, <span class="ident">signers</span>, <span class="ident">secp</span>)
2113             }
2114         }
2115     }
2116 }
2117
2118 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
2119 <span class="kw">mod</span> <span class="ident">test</span> {
2120
2121     <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">descriptor</span>;
2122     <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">descriptor</span>::{<span class="ident">ExtractPolicy</span>, <span class="ident">ToWalletDescriptor</span>};
2123
2124     <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
2125     <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">descriptor</span>::<span class="ident">policy</span>::<span class="ident">SatisfiableItem</span>::{<span class="ident">Multisig</span>, <span class="ident">Signature</span>, <span class="ident">Thresh</span>};
2126     <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">keys</span>::{<span class="ident">DescriptorKey</span>, <span class="ident">ToDescriptorKey</span>};
2127     <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">wallet</span>::<span class="ident">signer</span>::<span class="ident">SignersContainer</span>;
2128     <span class="kw">use</span> <span class="ident">bitcoin</span>::<span class="ident">secp256k1</span>::{<span class="ident">All</span>, <span class="ident">Secp256k1</span>};
2129     <span class="kw">use</span> <span class="ident">bitcoin</span>::<span class="ident">util</span>::<span class="ident">bip32</span>;
2130     <span class="kw">use</span> <span class="ident">bitcoin</span>::<span class="ident">util</span>::<span class="ident">bip32</span>::<span class="ident">ChildNumber</span>;
2131     <span class="kw">use</span> <span class="ident">bitcoin</span>::<span class="ident">Network</span>;
2132     <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>::<span class="ident">FromStr</span>;
2133     <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Arc</span>;
2134
2135     <span class="kw">const</span> <span class="ident">TPRV0_STR</span>:<span class="kw-2">&amp;</span><span class="ident">str</span> <span class="op">=</span> <span class="string">&quot;tprv8ZgxMBicQKsPdZXrcHNLf5JAJWFAoJ2TrstMRdSKtEggz6PddbuSkvHKM9oKJyFgZV1B7rw8oChspxyYbtmEXYyg1AjfWbL3ho3XHDpHRZf&quot;</span>;
2136     <span class="kw">const</span> <span class="ident">TPRV1_STR</span>:<span class="kw-2">&amp;</span><span class="ident">str</span> <span class="op">=</span> <span class="string">&quot;tprv8ZgxMBicQKsPdpkqS7Eair4YxjcuuvDPNYmKX3sCniCf16tHEVrjjiSXEkFRnUH77yXc6ZcwHHcLNfjdi5qUvw3VDfgYiH5mNsj5izuiu2N&quot;</span>;
2137
2138     <span class="kw">const</span> <span class="ident">PATH</span>: <span class="kw-2">&amp;</span><span class="ident">str</span> <span class="op">=</span> <span class="string">&quot;m/44&#39;/1&#39;/0&#39;/0&quot;</span>;
2139
2140     <span class="kw">fn</span> <span class="ident">setup_keys</span><span class="op">&lt;</span><span class="ident">Ctx</span>: <span class="ident">ScriptContext</span><span class="op">&gt;</span>(
2141         <span class="ident">tprv</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>,
2142     ) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">DescriptorKey</span><span class="op">&lt;</span><span class="ident">Ctx</span><span class="op">&gt;</span>, <span class="ident">DescriptorKey</span><span class="op">&lt;</span><span class="ident">Ctx</span><span class="op">&gt;</span>, <span class="ident">Fingerprint</span>) {
2143         <span class="kw">let</span> <span class="ident">secp</span>: <span class="ident">Secp256k1</span><span class="op">&lt;</span><span class="ident">All</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Secp256k1</span>::<span class="ident">new</span>();
2144         <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">bip32</span>::<span class="ident">DerivationPath</span>::<span class="ident">from_str</span>(<span class="ident">PATH</span>).<span class="ident">unwrap</span>();
2145         <span class="kw">let</span> <span class="ident">tprv</span> <span class="op">=</span> <span class="ident">bip32</span>::<span class="ident">ExtendedPrivKey</span>::<span class="ident">from_str</span>(<span class="ident">tprv</span>).<span class="ident">unwrap</span>();
2146         <span class="kw">let</span> <span class="ident">tpub</span> <span class="op">=</span> <span class="ident">bip32</span>::<span class="ident">ExtendedPubKey</span>::<span class="ident">from_private</span>(<span class="kw-2">&amp;</span><span class="ident">secp</span>, <span class="kw-2">&amp;</span><span class="ident">tprv</span>);
2147         <span class="kw">let</span> <span class="ident">fingerprint</span> <span class="op">=</span> <span class="ident">tprv</span>.<span class="ident">fingerprint</span>(<span class="kw-2">&amp;</span><span class="ident">secp</span>);
2148         <span class="kw">let</span> <span class="ident">prvkey</span> <span class="op">=</span> (<span class="ident">tprv</span>, <span class="ident">path</span>.<span class="ident">clone</span>()).<span class="ident">to_descriptor_key</span>().<span class="ident">unwrap</span>();
2149         <span class="kw">let</span> <span class="ident">pubkey</span> <span class="op">=</span> (<span class="ident">tpub</span>, <span class="ident">path</span>).<span class="ident">to_descriptor_key</span>().<span class="ident">unwrap</span>();
2150
2151         (<span class="ident">prvkey</span>, <span class="ident">pubkey</span>, <span class="ident">fingerprint</span>)
2152     }
2153
2154     <span class="comment">// test ExtractPolicy trait for simple descriptors; wpkh(), sh(multi())</span>
2155
2156     <span class="attribute">#[<span class="ident">test</span>]</span>
2157     <span class="kw">fn</span> <span class="ident">test_extract_policy_for_wpkh</span>() {
2158         <span class="kw">let</span> (<span class="ident">prvkey</span>, <span class="ident">pubkey</span>, <span class="ident">fingerprint</span>) <span class="op">=</span> <span class="ident">setup_keys</span>(<span class="ident">TPRV0_STR</span>);
2159         <span class="kw">let</span> <span class="ident">desc</span> <span class="op">=</span> <span class="macro">descriptor</span><span class="macro">!</span>(<span class="ident">wpkh</span>(<span class="ident">pubkey</span>)).<span class="ident">unwrap</span>();
2160         <span class="kw">let</span> (<span class="ident">wallet_desc</span>, <span class="ident">keymap</span>) <span class="op">=</span> <span class="ident">desc</span>.<span class="ident">to_wallet_descriptor</span>(<span class="ident">Network</span>::<span class="ident">Testnet</span>).<span class="ident">unwrap</span>();
2161         <span class="kw">let</span> <span class="ident">signers_container</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">SignersContainer</span>::<span class="ident">from</span>(<span class="ident">keymap</span>));
2162         <span class="kw">let</span> <span class="ident">policy</span> <span class="op">=</span> <span class="ident">wallet_desc</span>
2163             .<span class="ident">extract_policy</span>(<span class="kw-2">&amp;</span><span class="ident">signers_container</span>, <span class="kw-2">&amp;</span><span class="ident">Secp256k1</span>::<span class="ident">new</span>())
2164             .<span class="ident">unwrap</span>()
2165             .<span class="ident">unwrap</span>();
2166
2167         <span class="macro">assert</span><span class="macro">!</span>(
2168             <span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">item</span>, <span class="ident">Signature</span>(<span class="ident">pk_or_f</span>) <span class="kw">if</span> <span class="kw-2">&amp;</span><span class="ident">pk_or_f</span>.<span class="ident">fingerprint</span>.<span class="ident">unwrap</span>() <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">fingerprint</span>)
2169         );
2170         <span class="macro">assert</span><span class="macro">!</span>(<span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">contribution</span>, <span class="ident">Satisfaction</span>::<span class="prelude-val">None</span>));
2171
2172         <span class="kw">let</span> <span class="ident">desc</span> <span class="op">=</span> <span class="macro">descriptor</span><span class="macro">!</span>(<span class="ident">wpkh</span>(<span class="ident">prvkey</span>)).<span class="ident">unwrap</span>();
2173         <span class="kw">let</span> (<span class="ident">wallet_desc</span>, <span class="ident">keymap</span>) <span class="op">=</span> <span class="ident">desc</span>.<span class="ident">to_wallet_descriptor</span>(<span class="ident">Network</span>::<span class="ident">Testnet</span>).<span class="ident">unwrap</span>();
2174         <span class="kw">let</span> <span class="ident">signers_container</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">SignersContainer</span>::<span class="ident">from</span>(<span class="ident">keymap</span>));
2175         <span class="kw">let</span> <span class="ident">policy</span> <span class="op">=</span> <span class="ident">wallet_desc</span>
2176             .<span class="ident">extract_policy</span>(<span class="kw-2">&amp;</span><span class="ident">signers_container</span>, <span class="kw-2">&amp;</span><span class="ident">Secp256k1</span>::<span class="ident">new</span>())
2177             .<span class="ident">unwrap</span>()
2178             .<span class="ident">unwrap</span>();
2179
2180         <span class="macro">assert</span><span class="macro">!</span>(
2181             <span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">item</span>, <span class="ident">Signature</span>(<span class="ident">pk_or_f</span>) <span class="kw">if</span> <span class="kw-2">&amp;</span><span class="ident">pk_or_f</span>.<span class="ident">fingerprint</span>.<span class="ident">unwrap</span>() <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">fingerprint</span>)
2182         );
2183         <span class="macro">assert</span><span class="macro">!</span>(
2184             <span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">contribution</span>, <span class="ident">Satisfaction</span>::<span class="ident">Complete</span> {<span class="ident">condition</span>} <span class="kw">if</span> <span class="ident">condition</span>.<span class="ident">csv</span> <span class="op">=</span><span class="op">=</span> <span class="prelude-val">None</span> <span class="op">&amp;&amp;</span> <span class="ident">condition</span>.<span class="ident">timelock</span> <span class="op">=</span><span class="op">=</span> <span class="prelude-val">None</span>)
2185         );
2186     }
2187
2188     <span class="comment">// 2 pub keys descriptor, required 2 prv keys</span>
2189     <span class="comment">// #[test]</span>
2190     <span class="comment">// fn test_extract_policy_for_sh_multi_partial_0of2() {</span>
2191     <span class="comment">//     let (_prvkey0, pubkey0, fingerprint0) = setup_keys(TPRV0_STR);</span>
2192     <span class="comment">//     let (_prvkey1, pubkey1, fingerprint1) = setup_keys(TPRV1_STR);</span>
2193     <span class="comment">//     let desc = descriptor!(sh(multi 2, pubkey0, pubkey1)).unwrap();</span>
2194     <span class="comment">//     let (wallet_desc, keymap) = desc.to_wallet_descriptor(Network::Testnet).unwrap();</span>
2195     <span class="comment">//     let signers_container = Arc::new(SignersContainer::from(keymap));</span>
2196     <span class="comment">//     let policy = wallet_desc</span>
2197     <span class="comment">//         .extract_policy(signers_container)</span>
2198     <span class="comment">//         .unwrap()</span>
2199     <span class="comment">//         .unwrap();</span>
2200     <span class="comment">//</span>
2201     <span class="comment">//     assert!(</span>
2202     <span class="comment">//         matches!(&amp;policy.item, Multisig { keys, threshold } if threshold == &amp;2</span>
2203     <span class="comment">//         &amp;&amp; &amp;keys[0].fingerprint.unwrap() == &amp;fingerprint0</span>
2204     <span class="comment">//         &amp;&amp; &amp;keys[1].fingerprint.unwrap() == &amp;fingerprint1)</span>
2205     <span class="comment">//     );</span>
2206     <span class="comment">//</span>
2207     <span class="comment">//     // TODO should this be &quot;Satisfaction::None&quot; since we have no prv keys?</span>
2208     <span class="comment">//     // TODO should items and conditions not be empty?</span>
2209     <span class="comment">//     assert!(</span>
2210     <span class="comment">//         matches!(&amp;policy.contribution, Satisfaction::Partial { n, m, items, conditions} if n == &amp;2</span>
2211     <span class="comment">//         &amp;&amp; m == &amp;2</span>
2212     <span class="comment">//         &amp;&amp; items.is_empty()</span>
2213     <span class="comment">//         &amp;&amp; conditions.is_empty()</span>
2214     <span class="comment">//         )</span>
2215     <span class="comment">//     );</span>
2216     <span class="comment">// }</span>
2217
2218     <span class="comment">// 1 prv and 1 pub key descriptor, required 2 prv keys</span>
2219     <span class="comment">// #[test]</span>
2220     <span class="comment">// fn test_extract_policy_for_sh_multi_partial_1of2() {</span>
2221     <span class="comment">//     let (prvkey0, _pubkey0, fingerprint0) = setup_keys(TPRV0_STR);</span>
2222     <span class="comment">//     let (_prvkey1, pubkey1, fingerprint1) = setup_keys(TPRV1_STR);</span>
2223     <span class="comment">//     let desc = descriptor!(sh(multi 2, prvkey0, pubkey1)).unwrap();</span>
2224     <span class="comment">//     let (wallet_desc, keymap) = desc.to_wallet_descriptor(Network::Testnet).unwrap();</span>
2225     <span class="comment">//     let signers_container = Arc::new(SignersContainer::from(keymap));</span>
2226     <span class="comment">//     let policy = wallet_desc</span>
2227     <span class="comment">//         .extract_policy(signers_container)</span>
2228     <span class="comment">//         .unwrap()</span>
2229     <span class="comment">//         .unwrap();</span>
2230     <span class="comment">//</span>
2231     <span class="comment">//     assert!(</span>
2232     <span class="comment">//         matches!(&amp;policy.item, Multisig { keys, threshold } if threshold == &amp;2</span>
2233     <span class="comment">//         &amp;&amp; &amp;keys[0].fingerprint.unwrap() == &amp;fingerprint0</span>
2234     <span class="comment">//         &amp;&amp; &amp;keys[1].fingerprint.unwrap() == &amp;fingerprint1)</span>
2235     <span class="comment">//     );</span>
2236     <span class="comment">//</span>
2237     <span class="comment">//     // TODO should this be &quot;Satisfaction::Partial&quot; since we have only one of two prv keys?</span>
2238     <span class="comment">//     assert!(</span>
2239     <span class="comment">//         matches!(&amp;policy.contribution, Satisfaction::PartialComplete { n, m, items, conditions} if n == &amp;2</span>
2240     <span class="comment">//          &amp;&amp; m == &amp;2</span>
2241     <span class="comment">//          &amp;&amp; items.len() == 2</span>
2242     <span class="comment">//          &amp;&amp; conditions.contains_key(&amp;vec![0,1])</span>
2243     <span class="comment">//         )</span>
2244     <span class="comment">//     );</span>
2245     <span class="comment">// }</span>
2246
2247     <span class="comment">// 1 prv and 1 pub key descriptor, required 1 prv keys</span>
2248     <span class="attribute">#[<span class="ident">test</span>]</span>
2249     <span class="attribute">#[<span class="ident">ignore</span>]</span> <span class="comment">// see https://github.com/bitcoindevkit/bdk/issues/225</span>
2250     <span class="kw">fn</span> <span class="ident">test_extract_policy_for_sh_multi_complete_1of2</span>() {
2251         <span class="kw">let</span> (<span class="ident">_prvkey0</span>, <span class="ident">pubkey0</span>, <span class="ident">fingerprint0</span>) <span class="op">=</span> <span class="ident">setup_keys</span>(<span class="ident">TPRV0_STR</span>);
2252         <span class="kw">let</span> (<span class="ident">prvkey1</span>, <span class="ident">_pubkey1</span>, <span class="ident">fingerprint1</span>) <span class="op">=</span> <span class="ident">setup_keys</span>(<span class="ident">TPRV1_STR</span>);
2253         <span class="kw">let</span> <span class="ident">desc</span> <span class="op">=</span> <span class="macro">descriptor</span><span class="macro">!</span>(<span class="ident">sh</span>(<span class="ident">multi</span> <span class="number">1</span>, <span class="ident">pubkey0</span>, <span class="ident">prvkey1</span>)).<span class="ident">unwrap</span>();
2254         <span class="kw">let</span> (<span class="ident">wallet_desc</span>, <span class="ident">keymap</span>) <span class="op">=</span> <span class="ident">desc</span>.<span class="ident">to_wallet_descriptor</span>(<span class="ident">Network</span>::<span class="ident">Testnet</span>).<span class="ident">unwrap</span>();
2255         <span class="kw">let</span> <span class="ident">signers_container</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">SignersContainer</span>::<span class="ident">from</span>(<span class="ident">keymap</span>));
2256         <span class="kw">let</span> <span class="ident">policy</span> <span class="op">=</span> <span class="ident">wallet_desc</span>
2257             .<span class="ident">extract_policy</span>(<span class="kw-2">&amp;</span><span class="ident">signers_container</span>, <span class="kw-2">&amp;</span><span class="ident">Secp256k1</span>::<span class="ident">new</span>())
2258             .<span class="ident">unwrap</span>()
2259             .<span class="ident">unwrap</span>();
2260
2261         <span class="macro">assert</span><span class="macro">!</span>(
2262             <span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">item</span>, <span class="ident">Multisig</span> { <span class="ident">keys</span>, <span class="ident">threshold</span> } <span class="kw">if</span> <span class="ident">threshold</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="number">1</span>
2263             <span class="op">&amp;&amp;</span> <span class="kw-2">&amp;</span><span class="ident">keys</span>[<span class="number">0</span>].<span class="ident">fingerprint</span>.<span class="ident">unwrap</span>() <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">fingerprint0</span>
2264             <span class="op">&amp;&amp;</span> <span class="kw-2">&amp;</span><span class="ident">keys</span>[<span class="number">1</span>].<span class="ident">fingerprint</span>.<span class="ident">unwrap</span>() <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">fingerprint1</span>)
2265         );
2266         <span class="macro">assert</span><span class="macro">!</span>(
2267             <span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">contribution</span>, <span class="ident">Satisfaction</span>::<span class="ident">PartialComplete</span> { <span class="ident">n</span>, <span class="ident">m</span>, <span class="ident">items</span>, <span class="ident">conditions</span>, .. } <span class="kw">if</span> <span class="ident">n</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="number">2</span>
2268              <span class="op">&amp;&amp;</span> <span class="ident">m</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="number">1</span>
2269              <span class="op">&amp;&amp;</span> <span class="ident">items</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">2</span>
2270              <span class="op">&amp;&amp;</span> <span class="ident">conditions</span>.<span class="ident">contains_key</span>(<span class="kw-2">&amp;</span><span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>])
2271              <span class="op">&amp;&amp;</span> <span class="ident">conditions</span>.<span class="ident">contains_key</span>(<span class="kw-2">&amp;</span><span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>])
2272             )
2273         );
2274     }
2275
2276     <span class="comment">// 2 prv keys descriptor, required 2 prv keys</span>
2277     <span class="attribute">#[<span class="ident">test</span>]</span>
2278     <span class="kw">fn</span> <span class="ident">test_extract_policy_for_sh_multi_complete_2of2</span>() {
2279         <span class="kw">let</span> (<span class="ident">prvkey0</span>, <span class="ident">_pubkey0</span>, <span class="ident">fingerprint0</span>) <span class="op">=</span> <span class="ident">setup_keys</span>(<span class="ident">TPRV0_STR</span>);
2280         <span class="kw">let</span> (<span class="ident">prvkey1</span>, <span class="ident">_pubkey1</span>, <span class="ident">fingerprint1</span>) <span class="op">=</span> <span class="ident">setup_keys</span>(<span class="ident">TPRV1_STR</span>);
2281         <span class="kw">let</span> <span class="ident">desc</span> <span class="op">=</span> <span class="macro">descriptor</span><span class="macro">!</span>(<span class="ident">sh</span>(<span class="ident">multi</span> <span class="number">2</span>, <span class="ident">prvkey0</span>, <span class="ident">prvkey1</span>)).<span class="ident">unwrap</span>();
2282         <span class="kw">let</span> (<span class="ident">wallet_desc</span>, <span class="ident">keymap</span>) <span class="op">=</span> <span class="ident">desc</span>.<span class="ident">to_wallet_descriptor</span>(<span class="ident">Network</span>::<span class="ident">Testnet</span>).<span class="ident">unwrap</span>();
2283         <span class="kw">let</span> <span class="ident">signers_container</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">SignersContainer</span>::<span class="ident">from</span>(<span class="ident">keymap</span>));
2284         <span class="kw">let</span> <span class="ident">policy</span> <span class="op">=</span> <span class="ident">wallet_desc</span>
2285             .<span class="ident">extract_policy</span>(<span class="kw-2">&amp;</span><span class="ident">signers_container</span>, <span class="kw-2">&amp;</span><span class="ident">Secp256k1</span>::<span class="ident">new</span>())
2286             .<span class="ident">unwrap</span>()
2287             .<span class="ident">unwrap</span>();
2288
2289         <span class="macro">assert</span><span class="macro">!</span>(
2290             <span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">item</span>, <span class="ident">Multisig</span> { <span class="ident">keys</span>, <span class="ident">threshold</span> } <span class="kw">if</span> <span class="ident">threshold</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="number">2</span>
2291             <span class="op">&amp;&amp;</span> <span class="kw-2">&amp;</span><span class="ident">keys</span>[<span class="number">0</span>].<span class="ident">fingerprint</span>.<span class="ident">unwrap</span>() <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">fingerprint0</span>
2292             <span class="op">&amp;&amp;</span> <span class="kw-2">&amp;</span><span class="ident">keys</span>[<span class="number">1</span>].<span class="ident">fingerprint</span>.<span class="ident">unwrap</span>() <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">fingerprint1</span>)
2293         );
2294
2295         <span class="macro">assert</span><span class="macro">!</span>(
2296             <span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">contribution</span>, <span class="ident">Satisfaction</span>::<span class="ident">PartialComplete</span> { <span class="ident">n</span>, <span class="ident">m</span>, <span class="ident">items</span>, <span class="ident">conditions</span>, .. } <span class="kw">if</span> <span class="ident">n</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="number">2</span>
2297              <span class="op">&amp;&amp;</span> <span class="ident">m</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="number">2</span>
2298              <span class="op">&amp;&amp;</span> <span class="ident">items</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">2</span>
2299              <span class="op">&amp;&amp;</span> <span class="ident">conditions</span>.<span class="ident">contains_key</span>(<span class="kw-2">&amp;</span><span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>,<span class="number">1</span>])
2300             )
2301         );
2302     }
2303
2304     <span class="comment">// test ExtractPolicy trait with extended and single keys</span>
2305
2306     <span class="attribute">#[<span class="ident">test</span>]</span>
2307     <span class="kw">fn</span> <span class="ident">test_extract_policy_for_single_wpkh</span>() {
2308         <span class="kw">let</span> (<span class="ident">prvkey</span>, <span class="ident">pubkey</span>, <span class="ident">fingerprint</span>) <span class="op">=</span> <span class="ident">setup_keys</span>(<span class="ident">TPRV0_STR</span>);
2309         <span class="kw">let</span> <span class="ident">desc</span> <span class="op">=</span> <span class="macro">descriptor</span><span class="macro">!</span>(<span class="ident">wpkh</span>(<span class="ident">pubkey</span>)).<span class="ident">unwrap</span>();
2310         <span class="kw">let</span> (<span class="ident">wallet_desc</span>, <span class="ident">keymap</span>) <span class="op">=</span> <span class="ident">desc</span>.<span class="ident">to_wallet_descriptor</span>(<span class="ident">Network</span>::<span class="ident">Testnet</span>).<span class="ident">unwrap</span>();
2311         <span class="kw">let</span> <span class="ident">single_key</span> <span class="op">=</span> <span class="ident">wallet_desc</span>.<span class="ident">derive</span>(<span class="ident">ChildNumber</span>::<span class="ident">from_normal_idx</span>(<span class="number">0</span>).<span class="ident">unwrap</span>());
2312         <span class="kw">let</span> <span class="ident">signers_container</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">SignersContainer</span>::<span class="ident">from</span>(<span class="ident">keymap</span>));
2313         <span class="kw">let</span> <span class="ident">policy</span> <span class="op">=</span> <span class="ident">single_key</span>
2314             .<span class="ident">extract_policy</span>(<span class="kw-2">&amp;</span><span class="ident">signers_container</span>, <span class="kw-2">&amp;</span><span class="ident">Secp256k1</span>::<span class="ident">new</span>())
2315             .<span class="ident">unwrap</span>()
2316             .<span class="ident">unwrap</span>();
2317
2318         <span class="macro">assert</span><span class="macro">!</span>(
2319             <span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">item</span>, <span class="ident">Signature</span>(<span class="ident">pk_or_f</span>) <span class="kw">if</span> <span class="kw-2">&amp;</span><span class="ident">pk_or_f</span>.<span class="ident">fingerprint</span>.<span class="ident">unwrap</span>() <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">fingerprint</span>)
2320         );
2321         <span class="macro">assert</span><span class="macro">!</span>(<span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">contribution</span>, <span class="ident">Satisfaction</span>::<span class="prelude-val">None</span>));
2322
2323         <span class="kw">let</span> <span class="ident">desc</span> <span class="op">=</span> <span class="macro">descriptor</span><span class="macro">!</span>(<span class="ident">wpkh</span>(<span class="ident">prvkey</span>)).<span class="ident">unwrap</span>();
2324         <span class="kw">let</span> (<span class="ident">wallet_desc</span>, <span class="ident">keymap</span>) <span class="op">=</span> <span class="ident">desc</span>.<span class="ident">to_wallet_descriptor</span>(<span class="ident">Network</span>::<span class="ident">Testnet</span>).<span class="ident">unwrap</span>();
2325         <span class="kw">let</span> <span class="ident">single_key</span> <span class="op">=</span> <span class="ident">wallet_desc</span>.<span class="ident">derive</span>(<span class="ident">ChildNumber</span>::<span class="ident">from_normal_idx</span>(<span class="number">0</span>).<span class="ident">unwrap</span>());
2326         <span class="kw">let</span> <span class="ident">signers_container</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">SignersContainer</span>::<span class="ident">from</span>(<span class="ident">keymap</span>));
2327         <span class="kw">let</span> <span class="ident">policy</span> <span class="op">=</span> <span class="ident">single_key</span>
2328             .<span class="ident">extract_policy</span>(<span class="kw-2">&amp;</span><span class="ident">signers_container</span>, <span class="kw-2">&amp;</span><span class="ident">Secp256k1</span>::<span class="ident">new</span>())
2329             .<span class="ident">unwrap</span>()
2330             .<span class="ident">unwrap</span>();
2331
2332         <span class="macro">assert</span><span class="macro">!</span>(
2333             <span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">item</span>, <span class="ident">Signature</span>(<span class="ident">pk_or_f</span>) <span class="kw">if</span> <span class="kw-2">&amp;</span><span class="ident">pk_or_f</span>.<span class="ident">fingerprint</span>.<span class="ident">unwrap</span>() <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">fingerprint</span>)
2334         );
2335         <span class="macro">assert</span><span class="macro">!</span>(
2336             <span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">contribution</span>, <span class="ident">Satisfaction</span>::<span class="ident">Complete</span> {<span class="ident">condition</span>} <span class="kw">if</span> <span class="ident">condition</span>.<span class="ident">csv</span> <span class="op">=</span><span class="op">=</span> <span class="prelude-val">None</span> <span class="op">&amp;&amp;</span> <span class="ident">condition</span>.<span class="ident">timelock</span> <span class="op">=</span><span class="op">=</span> <span class="prelude-val">None</span>)
2337         );
2338     }
2339
2340     <span class="comment">// single key, 1 prv and 1 pub key descriptor, required 1 prv keys</span>
2341     <span class="attribute">#[<span class="ident">test</span>]</span>
2342     <span class="attribute">#[<span class="ident">ignore</span>]</span> <span class="comment">// see https://github.com/bitcoindevkit/bdk/issues/225</span>
2343     <span class="kw">fn</span> <span class="ident">test_extract_policy_for_single_wsh_multi_complete_1of2</span>() {
2344         <span class="kw">let</span> (<span class="ident">_prvkey0</span>, <span class="ident">pubkey0</span>, <span class="ident">fingerprint0</span>) <span class="op">=</span> <span class="ident">setup_keys</span>(<span class="ident">TPRV0_STR</span>);
2345         <span class="kw">let</span> (<span class="ident">prvkey1</span>, <span class="ident">_pubkey1</span>, <span class="ident">fingerprint1</span>) <span class="op">=</span> <span class="ident">setup_keys</span>(<span class="ident">TPRV1_STR</span>);
2346         <span class="kw">let</span> <span class="ident">desc</span> <span class="op">=</span> <span class="macro">descriptor</span><span class="macro">!</span>(<span class="ident">sh</span>(<span class="ident">multi</span> <span class="number">1</span>, <span class="ident">pubkey0</span>, <span class="ident">prvkey1</span>)).<span class="ident">unwrap</span>();
2347         <span class="kw">let</span> (<span class="ident">wallet_desc</span>, <span class="ident">keymap</span>) <span class="op">=</span> <span class="ident">desc</span>.<span class="ident">to_wallet_descriptor</span>(<span class="ident">Network</span>::<span class="ident">Testnet</span>).<span class="ident">unwrap</span>();
2348         <span class="kw">let</span> <span class="ident">single_key</span> <span class="op">=</span> <span class="ident">wallet_desc</span>.<span class="ident">derive</span>(<span class="ident">ChildNumber</span>::<span class="ident">from_normal_idx</span>(<span class="number">0</span>).<span class="ident">unwrap</span>());
2349         <span class="kw">let</span> <span class="ident">signers_container</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">SignersContainer</span>::<span class="ident">from</span>(<span class="ident">keymap</span>));
2350         <span class="kw">let</span> <span class="ident">policy</span> <span class="op">=</span> <span class="ident">single_key</span>
2351             .<span class="ident">extract_policy</span>(<span class="kw-2">&amp;</span><span class="ident">signers_container</span>, <span class="kw-2">&amp;</span><span class="ident">Secp256k1</span>::<span class="ident">new</span>())
2352             .<span class="ident">unwrap</span>()
2353             .<span class="ident">unwrap</span>();
2354
2355         <span class="macro">assert</span><span class="macro">!</span>(
2356             <span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">item</span>, <span class="ident">Multisig</span> { <span class="ident">keys</span>, <span class="ident">threshold</span> } <span class="kw">if</span> <span class="ident">threshold</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="number">1</span>
2357             <span class="op">&amp;&amp;</span> <span class="kw-2">&amp;</span><span class="ident">keys</span>[<span class="number">0</span>].<span class="ident">fingerprint</span>.<span class="ident">unwrap</span>() <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">fingerprint0</span>
2358             <span class="op">&amp;&amp;</span> <span class="kw-2">&amp;</span><span class="ident">keys</span>[<span class="number">1</span>].<span class="ident">fingerprint</span>.<span class="ident">unwrap</span>() <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">fingerprint1</span>)
2359         );
2360         <span class="macro">assert</span><span class="macro">!</span>(
2361             <span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">contribution</span>, <span class="ident">Satisfaction</span>::<span class="ident">PartialComplete</span> { <span class="ident">n</span>, <span class="ident">m</span>, <span class="ident">items</span>, <span class="ident">conditions</span>, .. } <span class="kw">if</span> <span class="ident">n</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="number">2</span>
2362              <span class="op">&amp;&amp;</span> <span class="ident">m</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="number">1</span>
2363              <span class="op">&amp;&amp;</span> <span class="ident">items</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">2</span>
2364              <span class="op">&amp;&amp;</span> <span class="ident">conditions</span>.<span class="ident">contains_key</span>(<span class="kw-2">&amp;</span><span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>])
2365              <span class="op">&amp;&amp;</span> <span class="ident">conditions</span>.<span class="ident">contains_key</span>(<span class="kw-2">&amp;</span><span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>])
2366             )
2367         );
2368     }
2369
2370     <span class="comment">// test ExtractPolicy trait with descriptors containing timelocks in a thresh()</span>
2371
2372     <span class="attribute">#[<span class="ident">test</span>]</span>
2373     <span class="attribute">#[<span class="ident">ignore</span>]</span> <span class="comment">// see https://github.com/bitcoindevkit/bdk/issues/225</span>
2374     <span class="kw">fn</span> <span class="ident">test_extract_policy_for_wsh_multi_timelock</span>() {
2375         <span class="kw">let</span> (<span class="ident">prvkey0</span>, <span class="ident">_pubkey0</span>, <span class="ident">_fingerprint0</span>) <span class="op">=</span> <span class="ident">setup_keys</span>(<span class="ident">TPRV0_STR</span>);
2376         <span class="kw">let</span> (<span class="ident">_prvkey1</span>, <span class="ident">pubkey1</span>, <span class="ident">_fingerprint1</span>) <span class="op">=</span> <span class="ident">setup_keys</span>(<span class="ident">TPRV1_STR</span>);
2377         <span class="kw">let</span> <span class="ident">sequence</span> <span class="op">=</span> <span class="number">50</span>;
2378         <span class="kw">let</span> <span class="ident">desc</span> <span class="op">=</span> <span class="macro">descriptor</span><span class="macro">!</span>(<span class="ident">wsh</span> (
2379             <span class="ident">thresh</span> <span class="number">2</span>, (<span class="ident">pk</span> <span class="ident">prvkey0</span>), (<span class="op">+</span><span class="ident">s</span> <span class="ident">pk</span> <span class="ident">pubkey1</span>), (<span class="op">+</span><span class="ident">s</span><span class="op">+</span><span class="ident">d</span><span class="op">+</span><span class="ident">v</span> <span class="ident">older</span> <span class="ident">sequence</span>)
2380         ))
2381         .<span class="ident">unwrap</span>();
2382
2383         <span class="kw">let</span> (<span class="ident">wallet_desc</span>, <span class="ident">keymap</span>) <span class="op">=</span> <span class="ident">desc</span>.<span class="ident">to_wallet_descriptor</span>(<span class="ident">Network</span>::<span class="ident">Testnet</span>).<span class="ident">unwrap</span>();
2384         <span class="kw">let</span> <span class="ident">signers_container</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">SignersContainer</span>::<span class="ident">from</span>(<span class="ident">keymap</span>));
2385         <span class="kw">let</span> <span class="ident">policy</span> <span class="op">=</span> <span class="ident">wallet_desc</span>
2386             .<span class="ident">extract_policy</span>(<span class="kw-2">&amp;</span><span class="ident">signers_container</span>, <span class="kw-2">&amp;</span><span class="ident">Secp256k1</span>::<span class="ident">new</span>())
2387             .<span class="ident">unwrap</span>()
2388             .<span class="ident">unwrap</span>();
2389
2390         <span class="macro">assert</span><span class="macro">!</span>(
2391             <span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">item</span>, <span class="ident">Thresh</span> { <span class="ident">items</span>, <span class="ident">threshold</span> } <span class="kw">if</span> <span class="ident">items</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">3</span> <span class="op">&amp;&amp;</span> <span class="ident">threshold</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="number">2</span>)
2392         );
2393
2394         <span class="macro">assert</span><span class="macro">!</span>(
2395             <span class="macro">matches</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">policy</span>.<span class="ident">contribution</span>, <span class="ident">Satisfaction</span>::<span class="ident">PartialComplete</span> { <span class="ident">n</span>, <span class="ident">m</span>, <span class="ident">items</span>, <span class="ident">conditions</span>, .. } <span class="kw">if</span> <span class="ident">n</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="number">3</span>
2396              <span class="op">&amp;&amp;</span> <span class="ident">m</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">&amp;</span><span class="number">2</span>
2397              <span class="op">&amp;&amp;</span> <span class="ident">items</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">3</span>
2398              <span class="op">&amp;&amp;</span> <span class="ident">conditions</span>.<span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>,<span class="number">1</span>]).<span class="ident">unwrap</span>().<span class="ident">iter</span>().<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">csv</span>.<span class="ident">is_none</span>()
2399              <span class="op">&amp;&amp;</span> <span class="ident">conditions</span>.<span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>,<span class="number">2</span>]).<span class="ident">unwrap</span>().<span class="ident">iter</span>().<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">csv</span> <span class="op">=</span><span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">sequence</span>)
2400              <span class="op">&amp;&amp;</span> <span class="ident">conditions</span>.<span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>,<span class="number">2</span>]).<span class="ident">unwrap</span>().<span class="ident">iter</span>().<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">csv</span> <span class="op">=</span><span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">sequence</span>)
2401             )
2402         );
2403     }
2404
2405     <span class="comment">// - mixed timelocks should fail</span>
2406
2407     <span class="comment">// #[test]</span>
2408     <span class="comment">// fn test_extract_policy_for_wsh_mixed_timelocks() {</span>
2409     <span class="comment">//     let (prvkey0, _pubkey0, _fingerprint0) = setup_keys(TPRV0_STR);</span>
2410     <span class="comment">//     let locktime_threshold = 500000000; // if less than this means block number, else block time in seconds</span>
2411     <span class="comment">//     let locktime_blocks = 100;</span>
2412     <span class="comment">//     let locktime_seconds = locktime_blocks + locktime_threshold;</span>
2413     <span class="comment">//     let desc = descriptor!(sh (and_v (+v pk prvkey0), (and_v (+v after locktime_seconds), (after locktime_blocks)))).unwrap();</span>
2414     <span class="comment">//     let (wallet_desc, keymap) = desc.to_wallet_descriptor(Network::Testnet).unwrap();</span>
2415     <span class="comment">//     let signers_container = Arc::new(SignersContainer::from(keymap));</span>
2416     <span class="comment">//     let policy = wallet_desc</span>
2417     <span class="comment">//         .extract_policy(signers_container)</span>
2418     <span class="comment">//         .unwrap()</span>
2419     <span class="comment">//         .unwrap();</span>
2420     <span class="comment">//</span>
2421     <span class="comment">//     println!(&quot;desc policy = {:?}&quot;, policy); // TODO remove</span>
2422     <span class="comment">//</span>
2423     <span class="comment">//     // TODO how should this fail with mixed timelocks?</span>
2424     <span class="comment">// }</span>
2425
2426     <span class="comment">// - multiple timelocks of the same type should be correctly merged together</span>
2427
2428     <span class="comment">// #[test]</span>
2429     <span class="comment">// fn test_extract_policy_for_multiple_same_timelocks() {</span>
2430     <span class="comment">//     let (prvkey0, _pubkey0, _fingerprint0) = setup_keys(TPRV0_STR);</span>
2431     <span class="comment">//     let locktime_blocks0 = 100;</span>
2432     <span class="comment">//     let locktime_blocks1 = 200;</span>
2433     <span class="comment">//     let desc = descriptor!(sh (and_v (+v pk prvkey0), (and_v (+v after locktime_blocks0), (after locktime_blocks1)))).unwrap();</span>
2434     <span class="comment">//     let (wallet_desc, keymap) = desc.to_wallet_descriptor(Network::Testnet).unwrap();</span>
2435     <span class="comment">//     let signers_container = Arc::new(SignersContainer::from(keymap));</span>
2436     <span class="comment">//     let policy = wallet_desc</span>
2437     <span class="comment">//         .extract_policy(signers_container)</span>
2438     <span class="comment">//         .unwrap()</span>
2439     <span class="comment">//         .unwrap();</span>
2440     <span class="comment">//</span>
2441     <span class="comment">//     println!(&quot;desc policy = {:?}&quot;, policy); // TODO remove</span>
2442     <span class="comment">//</span>
2443     <span class="comment">//     // TODO how should this merge timelocks?</span>
2444     <span class="comment">//</span>
2445     <span class="comment">//     let (prvkey1, _pubkey1, _fingerprint1) = setup_keys(TPRV0_STR);</span>
2446     <span class="comment">//     let locktime_seconds0 = 500000100;</span>
2447     <span class="comment">//     let locktime_seconds1 = 500000200;</span>
2448     <span class="comment">//     let desc = descriptor!(sh (and_v (+v pk prvkey1), (and_v (+v after locktime_seconds0), (after locktime_seconds1)))).unwrap();</span>
2449     <span class="comment">//     let (wallet_desc, keymap) = desc.to_wallet_descriptor(Network::Testnet).unwrap();</span>
2450     <span class="comment">//     let signers_container = Arc::new(SignersContainer::from(keymap));</span>
2451     <span class="comment">//     let policy = wallet_desc</span>
2452     <span class="comment">//         .extract_policy(signers_container)</span>
2453     <span class="comment">//         .unwrap()</span>
2454     <span class="comment">//         .unwrap();</span>
2455     <span class="comment">//</span>
2456     <span class="comment">//     println!(&quot;desc policy = {:?}&quot;, policy); // TODO remove</span>
2457     <span class="comment">//</span>
2458     <span class="comment">//     // TODO how should this merge timelocks?</span>
2459     <span class="comment">// }</span>
2460 }
2461 </pre></div>
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