1 files changed, 78 insertions, 0 deletions
diff --git a/comm/chat/protocols/matrix/lib/matrix-sdk/feature.js b/comm/chat/protocols/matrix/lib/matrix-sdk/feature.js
new file mode 100644
index 0000000000..e56be89ecb
--- /dev/null
+++ b/comm/chat/protocols/matrix/lib/matrix-sdk/feature.js
@@ -0,0 +1,78 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.ServerSupport = exports.Feature = void 0;
+exports.buildFeatureSupportMap = buildFeatureSupportMap;
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+let ServerSupport = /*#__PURE__*/function (ServerSupport) {
+  ServerSupport[ServerSupport["Stable"] = 0] = "Stable";
+  ServerSupport[ServerSupport["Unstable"] = 1] = "Unstable";
+  ServerSupport[ServerSupport["Unsupported"] = 2] = "Unsupported";
+  return ServerSupport;
+}({});
+exports.ServerSupport = ServerSupport;
+let Feature = /*#__PURE__*/function (Feature) {
+  Feature["Thread"] = "Thread";
+  Feature["ThreadUnreadNotifications"] = "ThreadUnreadNotifications";
+  Feature["LoginTokenRequest"] = "LoginTokenRequest";
+  Feature["RelationBasedRedactions"] = "RelationBasedRedactions";
+  Feature["AccountDataDeletion"] = "AccountDataDeletion";
+  Feature["RelationsRecursion"] = "RelationsRecursion";
+  return Feature;
+}({});
+exports.Feature = Feature;
+const featureSupportResolver = {
+  [Feature.Thread]: {
+    unstablePrefixes: ["org.matrix.msc3440"],
+    matrixVersion: "v1.3"
+  },
+  [Feature.ThreadUnreadNotifications]: {
+    unstablePrefixes: ["org.matrix.msc3771", "org.matrix.msc3773"],
+    matrixVersion: "v1.4"
+  },
+  [Feature.LoginTokenRequest]: {
+    unstablePrefixes: ["org.matrix.msc3882"]
+  },
+  [Feature.RelationBasedRedactions]: {
+    unstablePrefixes: ["org.matrix.msc3912"]
+  },
+  [Feature.AccountDataDeletion]: {
+    unstablePrefixes: ["org.matrix.msc3391"]
+  },
+  [Feature.RelationsRecursion]: {
+    unstablePrefixes: ["org.matrix.msc3981"]
+  }
+};
+async function buildFeatureSupportMap(versions) {
+  const supportMap = new Map();
+  for (const [feature, supportCondition] of Object.entries(featureSupportResolver)) {
+    const supportMatrixVersion = versions.versions?.includes(supportCondition.matrixVersion || "") ?? false;
+    const supportUnstablePrefixes = supportCondition.unstablePrefixes?.every(unstablePrefix => {
+      return versions.unstable_features?.[unstablePrefix] === true;
+    }) ?? false;
+    if (supportMatrixVersion) {
+      supportMap.set(feature, ServerSupport.Stable);
+    } else if (supportUnstablePrefixes) {
+      supportMap.set(feature, ServerSupport.Unstable);
+    } else {
+      supportMap.set(feature, ServerSupport.Unsupported);
+    }
+  }
+  return supportMap;
+}
+\ No newline at end of file