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Added unconfigurable wordlist protection
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src/protections/WordList.ts
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88
src/protections/WordList.ts
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/*
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Copyright 2019, 2020 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 { IProtection } from "./IProtection";
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import { Mjolnir } from "../Mjolnir";
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import { LogLevel, LogService } from "matrix-bot-sdk";
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import { logMessage } from "../LogProxy";
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import config from "../config";
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import { isTrueJoinEvent } from "../utils";
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export class WordList implements IProtection {
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private justJoined: { [roomId: string]: { [username: string]: Date} } = {};
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private badWords: RegExp = new RegExp(/.*(poopyhead).*/i)
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constructor() {
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}
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public get name(): string {
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return 'WordList';
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}
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public async handleEvent(mjolnir: Mjolnir, roomId: string, event: any): Promise<any> {
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if (!this.justJoined[roomId]) this.justJoined[roomId] = {};
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const content = event['content'] || {};
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// When a new member logs in, store the time they joined. This will be useful
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// when we need to check if a message was sent within 20 minutes of joining
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if (event['type'] === 'm.room.member') {
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if (isTrueJoinEvent(event)) {
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const now = new Date();
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this.justJoined[roomId][event['state_key']] = now;
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LogService.info("WordList", `${event['state_key']} joined ${roomId} at ${now.toDateString()}`);
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} else if (content['membership'] == 'leave' || content['membership'] == 'ban') {
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delete this.justJoined[roomId][event['sender']]
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}
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return; // stop processing (membership event spam is another problem)
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}
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if (event['type'] === 'm.room.message') {
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const message = content['formatted_body'] || content['body'] || null;
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const joinTime = this.justJoined[roomId][event['sender']]
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if (joinTime) { // Disregard if the user isn't recently joined
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// Check if they did join recently, was it within 20 minutes
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const now = new Date();
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if (now.valueOf() - joinTime.valueOf() > 20 * 60 * 1000) {
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delete this.justJoined[roomId][event['sender']] // Remove the user
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LogService.info("WordList", `${event['sender']} is no longer considered suspect`);
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return
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}
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// Perform the test
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if (message && this.badWords.test(message)) {
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await logMessage(LogLevel.WARN, "WordList", `Banning ${event['sender']} for word list violation in ${roomId}.`);
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if (!config.noop) {
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await mjolnir.client.banUser(event['sender'], roomId, "Word list violation");
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} else {
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await logMessage(LogLevel.WARN, "WordList", `Tried to ban ${event['sender']} in ${roomId} but Mjolnir is running in no-op mode`, roomId);
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}
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// Redact the event
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if (!config.noop) {
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await mjolnir.client.redactEvent(roomId, event['event_id'], "spam");
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} else {
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await logMessage(LogLevel.WARN, "WordList", `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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}
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@ -17,6 +17,7 @@ limitations under the License.
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import { FirstMessageIsImage } from "./FirstMessageIsImage";
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import { IProtection } from "./IProtection";
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import { BasicFlooding, MAX_PER_MINUTE } from "./BasicFlooding";
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import { WordList } from "./WordList";
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export const PROTECTIONS: PossibleProtections = {
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[new FirstMessageIsImage().name]: {
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@ -28,6 +29,11 @@ export const PROTECTIONS: PossibleProtections = {
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description: "If a user posts more than " + MAX_PER_MINUTE + " messages in 60s they'll be " +
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"banned for spam. This does not publish the ban to any of your ban lists.",
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factory: () => new BasicFlooding(),
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},
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[new WordList().name]: {
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description: "If a user posts a monitored word within 20 minutes of joining, they " +
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"will be banned from that room. This will not publish the ban to a ban list.",
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factory: () => new WordList(),
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}
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};
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