1 files changed, 75 insertions, 0 deletions
diff --git a/includes/external/matrix/node_modules/matrix-js-sdk/src/feature.ts b/includes/external/matrix/node_modules/matrix-js-sdk/src/feature.ts
new file mode 100644
index 0000000..9141e81
--- /dev/null
+++ b/includes/external/matrix/node_modules/matrix-js-sdk/src/feature.ts
@@ -0,0 +1,75 @@
+/*
+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.
+*/
+
+import { IServerVersions } from "./client";
+
+export enum ServerSupport {
+    Stable,
+    Unstable,
+    Unsupported,
+}
+
+export enum Feature {
+    Thread = "Thread",
+    ThreadUnreadNotifications = "ThreadUnreadNotifications",
+    LoginTokenRequest = "LoginTokenRequest",
+    RelationBasedRedactions = "RelationBasedRedactions",
+    AccountDataDeletion = "AccountDataDeletion",
+}
+
+type FeatureSupportCondition = {
+    unstablePrefixes?: string[];
+    matrixVersion?: string;
+};
+
+const featureSupportResolver: Record<string, FeatureSupportCondition> = {
+    [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"],
+    },
+};
+
+export async function buildFeatureSupportMap(versions: IServerVersions): Promise<Map<Feature, ServerSupport>> {
+    const supportMap = new Map<Feature, ServerSupport>();
+    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 as Feature, ServerSupport.Stable);
+        } else if (supportUnstablePrefixes) {
+            supportMap.set(feature as Feature, ServerSupport.Unstable);
+        } else {
+            supportMap.set(feature as Feature, ServerSupport.Unsupported);
+        }
+    }
+    return supportMap;
+}