Add a developer command to reset Megolm and Olm sessions (#9044)

Useful when debugging crypto setup.

src/SlashCommands.tsx

@@ -1070,6 +1070,28 @@ export const Commands = [
         category: CommandCategories.advanced,
         renderingTypes: [TimelineRenderingType.Room],
     }),
+    new Command({
+        command: 'remakeolm',
+        description: _td('Developer command: Discards the current outbound group session and sets up new Olm sessions'),
+        isEnabled: () => {
+            return SettingsStore.getValue("developerMode");
+        },
+        runFn: (roomId) => {
+            try {
+                const room = MatrixClientPeg.get().getRoom(roomId);
+
+                MatrixClientPeg.get().forceDiscardSession(roomId);
+
+                // noinspection JSIgnoredPromiseFromCall
+                MatrixClientPeg.get().crypto.ensureOlmSessionsForUsers(room.getMembers().map(m => m.userId), true);
+            } catch (e) {
+                return reject(e.message);
+            }
+            return success();
+        },
+        category: CommandCategories.advanced,
+        renderingTypes: [TimelineRenderingType.Room],
+    }),
     new Command({
         command: "rainbow",
         description: _td("Sends the given message coloured as a rainbow"),

src/i18n/strings/en_EN.json

@@ -445,6 +445,7 @@
     "Verified key": "Verified key",
     "The signing key you provided matches the signing key you received from %(userId)s's session %(deviceId)s. Session marked as verified.": "The signing key you provided matches the signing key you received from %(userId)s's session %(deviceId)s. Session marked as verified.",
     "Forces the current outbound group session in an encrypted room to be discarded": "Forces the current outbound group session in an encrypted room to be discarded",
+    "Developer command: Discards the current outbound group session and sets up new Olm sessions": "Developer command: Discards the current outbound group session and sets up new Olm sessions",
     "Sends the given message coloured as a rainbow": "Sends the given message coloured as a rainbow",
     "Sends the given emote coloured as a rainbow": "Sends the given emote coloured as a rainbow",
     "Displays list of commands with usages and descriptions": "Displays list of commands with usages and descriptions",