feat(mosaic-as): agent registration + scoped/revocable tokens (US-007) (#541)

packages/appservice/src/intent.ts

@@ -233,4 +233,30 @@ export class AppserviceIntent {
       body: { displayname: displayName },
     });
   }
+
+  /** Read an account_data object on the AS sender user. Returns null when the
+   * key has never been written (M_NOT_FOUND), so callers can treat that as an
+   * empty store; any other error propagates. */
+  async getSenderAccountData(type: string): Promise<Record<string, unknown> | null> {
+    const user = encodeURIComponent(this.senderUserId);
+    const key = encodeURIComponent(type);
+    try {
+      return await this.request('GET', `/_matrix/client/v3/user/${user}/account_data/${key}`, {
+        userId: this.senderUserId,
+      });
+    } catch (err) {
+      if (err instanceof MatrixApiError && err.errcode === 'M_NOT_FOUND') return null;
+      throw err;
+    }
+  }
+
+  /** Write an account_data object on the AS sender user. */
+  async setSenderAccountData(type: string, content: Record<string, unknown>): Promise<void> {
+    const user = encodeURIComponent(this.senderUserId);
+    const key = encodeURIComponent(type);
+    await this.request('PUT', `/_matrix/client/v3/user/${user}/account_data/${key}`, {
+      userId: this.senderUserId,
+      body: content,
+    });
+  }
 }