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src/protections/MentionSpam.ts
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89
src/protections/MentionSpam.ts
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/*
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Copyright 2024 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import { Protection } from "./IProtection";
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import { Mjolnir } from "../Mjolnir";
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import { LogLevel, Permalinks, UserID } from "@vector-im/matrix-bot-sdk";
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import { NumberProtectionSetting } from "./ProtectionSettings";
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export const DEFAULT_MAX_MENTIONS = 10;
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const USER_ID_SIGIL_REGEX = /(@|%40)/;
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export class MentionSpam extends Protection {
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settings = {
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maxMentions: new NumberProtectionSetting(DEFAULT_MAX_MENTIONS, 1),
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};
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constructor() {
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super();
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}
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public get name(): string {
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return 'MentionSpam';
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}
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public get description(): string {
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return "If a user posts many mentions, that message is redacted. No bans are issued.";
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}
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public checkMentions(body: unknown|undefined, htmlBody: unknown|undefined, mentionArray: unknown|undefined): boolean {
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const max = this.settings.maxMentions.value;
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const minMessageLength = max * 3; // "@:a"
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if (Array.isArray(mentionArray)) {
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if (mentionArray.length > this.settings.maxMentions.value) {
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return true;
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}
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}
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if (typeof body === "string" && body.length > minMessageLength) {
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let found = 0;
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for (const word of body.split(/\s/)) {
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if (USER_ID_SIGIL_REGEX.test(word.trim())) {
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if (++found > max) {
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return true;
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}
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}
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}
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}
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if (typeof htmlBody === "string" && htmlBody.length > minMessageLength) {
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let found = 0;
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for (const word of htmlBody.split(/\s/)) {
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if (USER_ID_SIGIL_REGEX.test(word.trim())) {
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if (++found > max) {
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return true;
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}
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}
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}
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}
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return false;
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}
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public async handleEvent(mjolnir: Mjolnir, roomId: string, event: any): Promise<any> {
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if (event['type'] === 'm.room.message') {
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let content = event['content'] || {};
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const explicitMentions = content["m.mentions"]?.user_ids;
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const hitLimit = this.checkMentions(content.body, content.formatted_body, explicitMentions);
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if (hitLimit) {
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await mjolnir.managementRoomOutput.logMessage(LogLevel.WARN, "MentionSpam", `Redacting event from ${event['sender']} for spamming mentions. ${Permalinks.forEvent(roomId, event['event_id'], [new UserID(await mjolnir.client.getUserId()).domain])}`);
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// Redact the event
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if (!mjolnir.config.noop) {
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await mjolnir.client.redactEvent(roomId, event['event_id'], "Message was detected as spam.");
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} else {
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await mjolnir.managementRoomOutput.logMessage(LogLevel.WARN, "MentionSpam", `Tried to redact ${event['event_id']} in ${roomId} but Mjolnir is running in no-op mode`, roomId);
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}
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}
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}
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}
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}
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@ -1,5 +1,5 @@
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/*
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Copyright 2019 - 2022 The Matrix.org Foundation C.I.C.
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Copyright 2019 - 2024 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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@ -32,6 +32,7 @@ import { ERROR_KIND_FATAL, ERROR_KIND_PERMISSION } from "../ErrorCache";
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import { RoomUpdateError } from "../models/RoomUpdateError";
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import { LocalAbuseReports } from "./LocalAbuseReports";
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import {NsfwProtection} from "./NsfwProtection";
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import { MentionSpam } from "./MentionSpam";
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const PROTECTIONS: Protection[] = [
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new FirstMessageIsImage(),
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@ -43,7 +44,8 @@ const PROTECTIONS: Protection[] = [
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new DetectFederationLag(),
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new JoinWaveShortCircuit(),
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new LocalAbuseReports(),
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new NsfwProtection()
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new NsfwProtection(),
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new MentionSpam()
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];
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const ENABLED_PROTECTIONS_EVENT_TYPE = "org.matrix.mjolnir.enabled_protections";
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101
test/integration/mentionSpamProtectionTest.ts
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101
test/integration/mentionSpamProtectionTest.ts
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import {newTestUser} from "./clientHelper";
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import {MatrixClient} from "@vector-im/matrix-bot-sdk";
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import {getFirstReaction} from "./commands/commandUtils";
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import {strict as assert} from "assert";
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import { DEFAULT_MAX_MENTIONS } from "../../src/protections/MentionSpam";
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describe("Test: Mention spam protection", function () {
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let client: MatrixClient;
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let room: string;
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this.beforeEach(async function () {
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client = await newTestUser(this.config.homeserverUrl, {name: {contains: "mention-spam-protection"}});
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await client.start();
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const mjolnirId = await this.mjolnir.client.getUserId();
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room = await client.createRoom({ invite: [mjolnirId] });
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await client.joinRoom(room);
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await client.joinRoom(this.config.managementRoom);
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await client.setUserPowerLevel(mjolnirId, room, 100);
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})
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this.afterEach(async function () {
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await client.stop();
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})
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function delay(ms: number) {
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return new Promise(resolve => setTimeout(resolve, ms));
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}
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it("does not redact a normal message", async function() {
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await client.sendMessage(this.mjolnir.managementRoomId, { msgtype: 'm.text', body: `!mjolnir rooms add ${room}` });
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await getFirstReaction(client, this.mjolnir.managementRoomId, '✅', async () => {
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return await client.sendMessage(this.mjolnir.managementRoomId, { msgtype: 'm.text', body: "!mjolnir enable MentionSpam" });
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});
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const testMessage = await client.sendText(room, 'Hello world');
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await delay(500);
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const fetchedEvent = await client.getEvent(room, testMessage);
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assert.equal(Object.keys(fetchedEvent.content).length, 2, "This event should not have been redacted");
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});
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it("does not redact a message with some mentions", async function() {
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await client.sendMessage(this.mjolnir.managementRoomId, { msgtype: 'm.text', body: `!mjolnir rooms add ${room}` });
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await getFirstReaction(client, this.mjolnir.managementRoomId, '✅', async () => {
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return await client.sendMessage(this.mjolnir.managementRoomId, { msgtype: 'm.text', body: "!mjolnir enable MentionSpam" });
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});
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// Also covers HTML mentions
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const mentionUsers = Array.from({length: DEFAULT_MAX_MENTIONS}, (_, i) => `@user${i}:example.org`);
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const messageWithTextMentions = await client.sendText(room, mentionUsers.join(' '));
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const messageWithHTMLMentions = await client.sendHtmlText(room,
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mentionUsers.map(u => `<a href=\"https://matrix.to/#/${encodeURIComponent(u)}\">${u}</a>`).join(' '));
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const messageWithMMentions = await client.sendMessage(room, {
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msgtype: 'm.text',
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body: 'Hello world',
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['m.mentions']: {
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user_ids: mentionUsers
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}
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});
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await delay(500);
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const fetchedTextEvent = await client.getEvent(room, messageWithTextMentions);
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assert.equal(Object.keys(fetchedTextEvent.content).length, 2, "This event should not have been redacted");
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const fetchedHTMLEvent = await client.getEvent(room, messageWithHTMLMentions);
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assert.equal(Object.keys(fetchedHTMLEvent.content).length, 4, "This event should not have been redacted");
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const fetchedMentionsEvent = await client.getEvent(room, messageWithMMentions);
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assert.equal(Object.keys(fetchedMentionsEvent.content).length, 3, "This event should not have been redacted");
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});
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it("does redact a message with too many mentions", async function() {
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await client.sendMessage(this.mjolnir.managementRoomId, { msgtype: 'm.text', body: `!mjolnir rooms add ${room}` });
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await getFirstReaction(client, this.mjolnir.managementRoomId, '✅', async () => {
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return await client.sendMessage(this.mjolnir.managementRoomId, { msgtype: 'm.text', body: "!mjolnir enable MentionSpam" });
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});
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// Also covers HTML mentions
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const mentionUsers = Array.from({length: DEFAULT_MAX_MENTIONS+1}, (_, i) => `@user${i}:example.org`);
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const messageWithTextMentions = await client.sendText(room, mentionUsers.join(' '));
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const messageWithHTMLMentions = await client.sendHtmlText(room,
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mentionUsers.map(u => `<a href=\"https://matrix.to/#/${encodeURIComponent(u)}\">${u}</a>`).join(' '));
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const messageWithMMentions = await client.sendMessage(room, {
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msgtype: 'm.text',
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body: 'Hello world',
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['m.mentions']: {
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user_ids: mentionUsers
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}
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});
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await delay(500);
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const fetchedTextEvent = await client.getEvent(room, messageWithTextMentions);
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assert.equal(Object.keys(fetchedTextEvent.content).length, 0, "This event should have been redacted");
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const fetchedHTMLEvent = await client.getEvent(room, messageWithHTMLMentions);
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assert.equal(Object.keys(fetchedHTMLEvent.content).length, 0, "This event should have been redacted");
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const fetchedMentionsEvent = await client.getEvent(room, messageWithMMentions);
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assert.equal(Object.keys(fetchedMentionsEvent.content).length, 0, "This event should have been redacted");
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});
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});
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