Add utility method mxLoginWithAccessToken to login with existing access token (#7261)

src/Lifecycle.ts

@@ -538,8 +538,8 @@ export function hydrateSession(credentials: IMatrixClientCreds): Promise<MatrixC
  * fires on_logging_in, optionally clears localstorage, persists new credentials
  * to localstorage, starts the new client.
  *
- * @param {MatrixClientCreds} credentials
- * @param {Boolean} clearStorage
+ * @param {IMatrixClientCreds} credentials
+ * @param {Boolean} clearStorageEnabled
  *
  * @returns {Promise} promise which resolves to the new MatrixClient once it has been started
  */
@@ -918,3 +918,17 @@ export function stopMatrixClient(unsetClient = true): void {
         }
     }
 }
+
+// Utility method to perform a login with an existing access_token
+window.mxLoginWithAccessToken = async (hsUrl: string, accessToken: string): Promise<void> => {
+    const tempClient = createClient({
+        baseUrl: hsUrl,
+        accessToken,
+    });
+    const { user_id: userId } = await tempClient.whoami();
+    await doSetLoggedIn({
+        homeserverUrl: hsUrl,
+        accessToken,
+        userId,
+    }, true);
+};