Bug 1741170 - Assume domain hosts a Matrix server if no well-known is found. r=clokep

Differential Revision: https://phabricator.services.mozilla.com/D134151

--HG--
extra : amend_source : 832f75a60e08978c5dc69b1464f31882831b206d

chat/protocols/matrix/matrix.jsm

@@ -1539,7 +1539,7 @@ MatrixAccount.prototype = {
    * @throws {Error} When the autodiscovery failed.
    */
   async getServer() {
-    let domain = "https://matrix.org";
+    let domain = "matrix.org";
     if (this.nameIsMXID) {
       domain = this.protocol.splitUsername(this.name)[1];
     } else if (this.prefs.prefHasUserValue("server")) {
@@ -1550,14 +1550,24 @@ MatrixAccount.prototype = {
         this.prefs.getIntPref("port", 443)
       );
     }
-    const discoveredInfo = await MatrixSDK.AutoDiscovery.findClientConfig(
-      domain
-    );
-    const homeserverResult = discoveredInfo[HOMESERVER_WELL_KNOWN];
+    let discoveredInfo = await MatrixSDK.AutoDiscovery.findClientConfig(domain);
+    let homeserverResult = discoveredInfo[HOMESERVER_WELL_KNOWN];
+
+    // If the well-known lookup fails, pretend the domain has a well-known for
+    // itself.
+    if (homeserverResult.state !== MatrixSDK.AutoDiscovery.SUCCESS) {
+      discoveredInfo = await MatrixSDK.AutoDiscovery.fromDiscoveryConfig({
+        [HOMESERVER_WELL_KNOWN]: {
+          base_url: `https://${domain}`,
+        },
+      });
+      homeserverResult = discoveredInfo[HOMESERVER_WELL_KNOWN];
+    }
     if (homeserverResult.state === MatrixSDK.AutoDiscovery.PROMPT) {
       throw new Error(_("connection.error.serverNotFound"));
     }
     if (homeserverResult.state !== MatrixSDK.AutoDiscovery.SUCCESS) {
+      //TODO these are English strings generated by the SDK.
       throw new Error(homeserverResult.error);
     }
     return homeserverResult.base_url;