Add a command to shut down a room

Fixes https://github.com/matrix-org/mjolnir/issues/21

src/Mjolnir.ts

@@ -574,4 +574,11 @@ export class Mjolnir {
         const endpoint = `/_synapse/admin/v1/deactivate/${userId}`;
         return await this.client.doRequest("POST", endpoint);
     }
+
+    public async shutdownSynapseRoom(roomId: string): Promise<any> {
+        const endpoint = `/_synapse/admin/v1/shutdown_room/${roomId}`;
+        return await this.client.doRequest("POST", endpoint, null, {
+            new_room_user_id: await this.client.getUserId(),
+        });
+    }
 }

src/commands/CommandHandler.ts

@@ -34,6 +34,7 @@ import { execAddProtectedRoom, execRemoveProtectedRoom } from "./AddRemoveProtec
 import { execMoveAliasCommand } from "./MoveAliasCommand";
 import { execAddRoomToDirectoryCommand, execRemoveRoomFromDirectoryCommand } from "./AddRemoveRoomFromDirectoryCommand";
 import { execSetPowerLevelCommand } from "./SetPowerLevelCommand";
+import { execShutdownRoomCommand } from "./ShutdownRoomCommand";
 
 export const COMMAND_PREFIX = "!mjolnir";
 
@@ -88,6 +89,8 @@ export async function handleCommand(roomId: string, event: any, mjolnir: Mjolnir
             return await execRemoveRoomFromDirectoryCommand(roomId, event, mjolnir, parts);
         } else if (parts[1] === 'powerlevel' && parts.length > 3) {
             return await execSetPowerLevelCommand(roomId, event, mjolnir, parts);
+        } else if (parts[1] === 'shutdown' && parts[2] === 'room' && parts.length > 3) {
+            return await execShutdownRoomCommand(roomId, event, mjolnir, parts);
         } else {
             // Help menu
             const menu = "" +
@@ -114,6 +117,7 @@ export async function handleCommand(roomId: string, event: any, mjolnir: Mjolnir
                 "!mjolnir move <room alias> <room alias/ID>                          - Moves a <room alias> to a new <room ID>\n" +
                 "!mjolnir directory add <room alias/ID>                              - Publishes a room in the server's room directory\n" +
                 "!mjolnir directory remove <room alias/ID>                           - Removes a room from the server's room directory\n" +
+                "!mjolnir shutdown room <room alias/ID>                              - Uses the bot's account to shut down a room, preventing access to the room on this server\n" +
                 "!mjolnir powerlevel <user ID> <power level> [room alias/ID]         - Sets the power level of the user in the specified room (or all protected rooms)\n" +
                 "!mjolnir help                                                       - This menu\n";
             const html = `<b>Mjolnir help:</b><br><pre><code>${htmlEscape(menu)}</code></pre>`;

src/commands/ShutdownRoomCommand.ts

@@ -0,0 +1,34 @@
+/*
+Copyright 2020 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 { Mjolnir } from "../Mjolnir";
+import { RichReply } from "matrix-bot-sdk";
+
+// !mjolnir shutdown room <room>
+export async function execShutdownRoomCommand(roomId: string, event: any, mjolnir: Mjolnir, parts: string[]) {
+    const victim = parts[3];
+
+    const isAdmin = await mjolnir.isSynapseAdmin();
+    if (!isAdmin) {
+        const message = "I am not a Synapse administrator, or the endpoint is blocked";
+        const reply = RichReply.createFor(roomId, event, message, message);
+        reply['msgtype'] = "m.notice";
+        return mjolnir.client.sendMessage(roomId, reply);
+    }
+
+    await mjolnir.shutdownSynapseRoom(await mjolnir.client.resolveRoom(victim));
+    await mjolnir.client.unstableApis.addReactionToEvent(roomId, event['event_id'], '✅');
+}