commit bf2dbec6fb0946296ad8420a72f47d92b8386e68 · dunkirk.sh/irc-slack-bridge

+15

README.md

···

       101
        
         - IRC mentions (`@nick` or `nick:`) are converted to Slack mentions for mapped users

     

       102
        
         - IRC formatting codes are converted to Slack markdown

     

       103
        
         - IRC `/me` actions are displayed in a context block with the user's avatar

     

       0
        
       
     

       104
        
       - **Slack → IRC**: Messages from mapped Slack channels are sent to their corresponding IRC channels

     

       105
        
         - Slack mentions are converted to mapped IRC nicks, or the display name from `<@U123|name>` format

     

       106
        
         - Slack markdown is converted to IRC formatting codes

     

       107
        
         - File attachments are uploaded to Hack Club CDN and URLs are shared

     

       0
        
       
     

       0
        
       
     

       108
        
       - **User mappings** allow custom IRC nicknames for specific Slack users and enable proper mentions both ways

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       109
        
       

     

       110
        
       The bridge ignores its own messages and bot messages to prevent loops.

     

       111

···

       101
        
         - IRC mentions (`@nick` or `nick:`) are converted to Slack mentions for mapped users

     

       102
        
         - IRC formatting codes are converted to Slack markdown

     

       103
        
         - IRC `/me` actions are displayed in a context block with the user's avatar

     

       104
       +
         - Thread replies: Use `@xxxxx` (5-char thread ID) to reply to a Slack thread from IRC

     

       105
        
       - **Slack → IRC**: Messages from mapped Slack channels are sent to their corresponding IRC channels

     

       106
        
         - Slack mentions are converted to mapped IRC nicks, or the display name from `<@U123|name>` format

     

       107
        
         - Slack markdown is converted to IRC formatting codes

     

       108
        
         - File attachments are uploaded to Hack Club CDN and URLs are shared

     

       109
       +
         - Thread messages are prefixed with `@xxxxx` (5-char thread ID) to show they're part of a thread

     

       110
       +
         - First reply in a thread includes a quote of the parent message

     

       111
        
       - **User mappings** allow custom IRC nicknames for specific Slack users and enable proper mentions both ways

     

       112
       +
       

     

       113
       +
       #### Thread Support

     

       114
       +
       

     

       115
       +
       The bridge supports Slack threads with a simple IRC-friendly syntax:

     

       116
       +
       

     

       117
       +
       - **Slack → IRC**: Thread messages appear with a `@xxxxx` prefix (5-character thread ID)

     

       118
       +
         - First reply in a thread includes a quote: `<user> @xxxxx > original message`

     

       119
       +
         - Subsequent replies: `<user> @xxxxx message text`

     

       120
       +
       - **IRC → Slack**: Reply to a thread by including the thread ID in your message

     

       121
       +
         - Example: `@abc12 this is my reply`

     

       122
       +
         - The bridge removes the `@xxxxx` prefix and sends your message to the correct thread

     

       123
       +
         - Thread IDs are unique per thread and persist across restarts

     

       124
        
       

     

       125
        
       The bridge ignores its own messages and bot messages to prevent loops.

     

       126

+73 -3

src/index.ts

···

       10
        
       	convertSlackMentionsToIrc,

     

       11
        
       } from "./lib/mentions";

     

       12
        
       import { parseIRCFormatting, parseSlackMarkdown } from "./lib/parser";

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       13
        
       

     

       14
        
       const missingEnvVars = [];

     

       15
        
       if (!process.env.SLACK_BOT_TOKEN) missingEnvVars.push("SLACK_BOT_TOKEN");

     
···

       69
        
       

     

       70
        
       // Register slash commands

     

       71
        
       registerCommands();

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       72
        
       

     

       73
        
       // Track NickServ authentication state

     

       74
        
       let nickServAuthAttempted = false;

     
···

       174
        
       		// Parse IRC mentions and convert to Slack mentions

     

       175
        
       		let messageText = parseIRCFormatting(text);

     

       176
        
       

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       177
        
       		// Extract image URLs from the message

     

       178
        
       		const imagePattern =

     

       179
        
       			/https?:\/\/[^\s]+\.(?:png|jpg|jpeg|gif|webp|bmp|svg)(?:\?[^\s]*)?/gi;

     
···

       198
        
       					attachments: attachments,

     

       199
        
       					unfurl_links: false,

     

       200
        
       					unfurl_media: false,

     

       0
        
       
     

       201
        
       				});

     

       202
        
       			} else {

     

       203
        
       				await slackClient.chat.postMessage({

     
···

       208
        
       					icon_url: iconUrl,

     

       209
        
       					unfurl_links: true,

     

       210
        
       					unfurl_media: true,

     

       0
        
       
     

       211
        
       				});

     

       212
        
       			}

     

       213
        
       			console.log(`IRC (${to}) → Slack: <${nick}> ${text}`);

     
···

       279
        
       

     

       280
        
       // Slack event handlers

     

       281
        
       slackApp.event("message", async ({ payload }) => {

     

       282
       -
       	// Ignore bot messages and threaded messages

     

       283
        
       	if (payload.subtype && payload.subtype !== "file_share") return;

     

       284
        
       	if (payload.bot_id) return;

     

       285
        
       	if (payload.user === botUserId) return;

     

       286
       -
       	if (payload.thread_ts) return;

     

       287
        
       

     

       288
        
       	// Find IRC channel mapping for this Slack channel

     

       289
        
       	const mapping = channelMappings.getBySlackChannel(payload.channel);

     
···

       317
        
       		// Parse Slack markdown formatting

     

       318
        
       		messageText = parseSlackMarkdown(messageText);

     

       319
        
       

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       320
        
       		// Send message only if there's text content

     

       321
        
       		if (messageText.trim()) {

     

       322
        
       			const message = `<${username}> ${messageText}`;

     
···

       331
        
       				const data = await uploadToCDN(fileUrls);

     

       332
        
       

     

       333
        
       				for (const file of data.files) {

     

       334
       -
       					const fileMessage = `<${username}> ${file.deployedUrl}`;

     

       0
        
       
     

       335
        
       					ircClient.say(mapping.irc_channel, fileMessage);

     

       336
        
       					console.log(`Slack → IRC (file): ${fileMessage}`);

     

       337
        
       				}

···

       10
        
       	convertSlackMentionsToIrc,

     

       11
        
       } from "./lib/mentions";

     

       12
        
       import { parseIRCFormatting, parseSlackMarkdown } from "./lib/parser";

     

       13
       +
       import {

     

       14
       +
       	cleanupOldThreads,

     

       15
       +
       	getThreadByThreadId,

     

       16
       +
       	isFirstThreadMessage,

     

       17
       +
       	updateThreadTimestamp,

     

       18
       +
       } from "./lib/threads";

     

       19
        
       

     

       20
        
       const missingEnvVars = [];

     

       21
        
       if (!process.env.SLACK_BOT_TOKEN) missingEnvVars.push("SLACK_BOT_TOKEN");

     
···

       75
        
       

     

       76
        
       // Register slash commands

     

       77
        
       registerCommands();

     

       78
       +
       

     

       79
       +
       // Periodic cleanup of old thread timestamps (every hour)

     

       80
       +
       setInterval(() => {

     

       81
       +
       	cleanupOldThreads();

     

       82
       +
       }, 60 * 60 * 1000);

     

       83
        
       

     

       84
        
       // Track NickServ authentication state

     

       85
        
       let nickServAuthAttempted = false;

     
···

       185
        
       		// Parse IRC mentions and convert to Slack mentions

     

       186
        
       		let messageText = parseIRCFormatting(text);

     

       187
        
       

     

       188
       +
       		// Check for @xxxxx mentions to reply to threads

     

       189
       +
       		const threadMentionPattern = /@([a-z0-9]{5})\b/i;

     

       190
       +
       		const threadMatch = messageText.match(threadMentionPattern);

     

       191
       +
       		let threadTs: string | undefined;

     

       192
       +
       

     

       193
       +
       		if (threadMatch) {

     

       194
       +
       			const threadId = threadMatch[1];

     

       195
       +
       			const threadInfo = getThreadByThreadId(threadId);

     

       196
       +
       			if (threadInfo && threadInfo.slack_channel_id === mapping.slack_channel_id) {

     

       197
       +
       				threadTs = threadInfo.thread_ts;

     

       198
       +
       				// Remove the @xxxxx from the message

     

       199
       +
       				messageText = messageText.replace(threadMentionPattern, "").trim();

     

       200
       +
       			}

     

       201
       +
       		}

     

       202
       +
       

     

       203
        
       		// Extract image URLs from the message

     

       204
        
       		const imagePattern =

     

       205
        
       			/https?:\/\/[^\s]+\.(?:png|jpg|jpeg|gif|webp|bmp|svg)(?:\?[^\s]*)?/gi;

     
···

       224
        
       					attachments: attachments,

     

       225
        
       					unfurl_links: false,

     

       226
        
       					unfurl_media: false,

     

       227
       +
       					thread_ts: threadTs,

     

       228
        
       				});

     

       229
        
       			} else {

     

       230
        
       				await slackClient.chat.postMessage({

     
···

       235
        
       					icon_url: iconUrl,

     

       236
        
       					unfurl_links: true,

     

       237
        
       					unfurl_media: true,

     

       238
       +
       					thread_ts: threadTs,

     

       239
        
       				});

     

       240
        
       			}

     

       241
        
       			console.log(`IRC (${to}) → Slack: <${nick}> ${text}`);

     
···

       307
        
       

     

       308
        
       // Slack event handlers

     

       309
        
       slackApp.event("message", async ({ payload }) => {

     

       310
       +
       	// Ignore bot messages

     

       311
        
       	if (payload.subtype && payload.subtype !== "file_share") return;

     

       312
        
       	if (payload.bot_id) return;

     

       313
        
       	if (payload.user === botUserId) return;

     

       0
        
       
     

       314
        
       

     

       315
        
       	// Find IRC channel mapping for this Slack channel

     

       316
        
       	const mapping = channelMappings.getBySlackChannel(payload.channel);

     
···

       344
        
       		// Parse Slack markdown formatting

     

       345
        
       		messageText = parseSlackMarkdown(messageText);

     

       346
        
       

     

       347
       +
       		let threadId: string | undefined;

     

       348
       +
       

     

       349
       +
       		// Handle thread messages

     

       350
       +
       		if (payload.thread_ts) {

     

       351
       +
       			const threadTs = payload.thread_ts;

     

       352
       +
       			const isFirstReply = isFirstThreadMessage(threadTs);

     

       353
       +
       			threadId = updateThreadTimestamp(threadTs, payload.channel);

     

       354
       +
       

     

       355
       +
       			if (isFirstReply) {

     

       356
       +
       				// First reply to thread, fetch and quote the parent message

     

       357
       +
       				try {

     

       358
       +
       					const parentResult = await slackClient.conversations.history({

     

       359
       +
       						token: process.env.SLACK_BOT_TOKEN,

     

       360
       +
       						channel: payload.channel,

     

       361
       +
       						latest: threadTs,

     

       362
       +
       						inclusive: true,

     

       363
       +
       						limit: 1,

     

       364
       +
       					});

     

       365
       +
       

     

       366
       +
       					if (parentResult.messages && parentResult.messages.length > 0) {

     

       367
       +
       						const parentMessage = parentResult.messages[0];

     

       368
       +
       						let parentText = await convertSlackMentionsToIrc(

     

       369
       +
       							parentMessage.text || "",

     

       370
       +
       						);

     

       371
       +
       						parentText = parseSlackMarkdown(parentText);

     

       372
       +
       

     

       373
       +
       						// Send the quoted parent message with thread ID

     

       374
       +
       						const quotedMessage = `<${username}> @${threadId} > ${parentText}`;

     

       375
       +
       						ircClient.say(mapping.irc_channel, quotedMessage);

     

       376
       +
       						console.log(`Slack → IRC (thread quote): ${quotedMessage}`);

     

       377
       +
       					}

     

       378
       +
       				} catch (error) {

     

       379
       +
       					console.error("Error fetching parent message:", error);

     

       380
       +
       				}

     

       381
       +
       			}

     

       382
       +
       

     

       383
       +
       			// Add thread ID to message

     

       384
       +
       			if (messageText.trim()) {

     

       385
       +
       				messageText = `@${threadId} ${messageText}`;

     

       386
       +
       			}

     

       387
       +
       		}

     

       388
       +
       

     

       389
        
       		// Send message only if there's text content

     

       390
        
       		if (messageText.trim()) {

     

       391
        
       			const message = `<${username}> ${messageText}`;

     
···

       400
        
       				const data = await uploadToCDN(fileUrls);

     

       401
        
       

     

       402
        
       				for (const file of data.files) {

     

       403
       +
       					const threadPrefix = threadId ? `@${threadId} ` : "";

     

       404
       +
       					const fileMessage = `<${username}> ${threadPrefix}${file.deployedUrl}`;

     

       405
        
       					ircClient.say(mapping.irc_channel, fileMessage);

     

       406
        
       					console.log(`Slack → IRC (file): ${fileMessage}`);

     

       407
        
       				}

+47

src/lib/db.ts

···

       20
        
         )

     

       21
        
       `);

     

       22
        
       

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       23
        
       export interface ChannelMapping {

     

       24
        
       	id?: number;

     

       25
        
       	slack_channel_id: string;

     
···

       91
        
       

     

       92
        
       	delete(slackUserId: string): void {

     

       93
        
       		db.run("DELETE FROM user_mappings WHERE slack_user_id = ?", [slackUserId]);

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       94
        
       	},

     

       95
        
       };

     

       96

···

       20
        
         )

     

       21
        
       `);

     

       22
        
       

     

       23
       +
       db.run(`

     

       24
       +
         CREATE TABLE IF NOT EXISTS thread_timestamps (

     

       25
       +
           thread_ts TEXT PRIMARY KEY,

     

       26
       +
           thread_id TEXT NOT NULL UNIQUE,

     

       27
       +
           slack_channel_id TEXT NOT NULL,

     

       28
       +
           last_message_time INTEGER NOT NULL

     

       29
       +
         )

     

       30
       +
       `);

     

       31
       +
       

     

       32
       +
       db.run(`

     

       33
       +
         CREATE INDEX IF NOT EXISTS idx_thread_id ON thread_timestamps(thread_id)

     

       34
       +
       `);

     

       35
       +
       

     

       36
        
       export interface ChannelMapping {

     

       37
        
       	id?: number;

     

       38
        
       	slack_channel_id: string;

     
···

       104
        
       

     

       105
        
       	delete(slackUserId: string): void {

     

       106
        
       		db.run("DELETE FROM user_mappings WHERE slack_user_id = ?", [slackUserId]);

     

       107
       +
       	},

     

       108
       +
       };

     

       109
       +
       

     

       110
       +
       export interface ThreadInfo {

     

       111
       +
       	thread_ts: string;

     

       112
       +
       	thread_id: string;

     

       113
       +
       	slack_channel_id: string;

     

       114
       +
       	last_message_time: number;

     

       115
       +
       }

     

       116
       +
       

     

       117
       +
       export const threadTimestamps = {

     

       118
       +
       	get(threadTs: string): ThreadInfo | null {

     

       119
       +
       		return db

     

       120
       +
       			.query("SELECT * FROM thread_timestamps WHERE thread_ts = ?")

     

       121
       +
       			.get(threadTs) as ThreadInfo | null;

     

       122
       +
       	},

     

       123
       +
       

     

       124
       +
       	getByThreadId(threadId: string): ThreadInfo | null {

     

       125
       +
       		return db

     

       126
       +
       			.query("SELECT * FROM thread_timestamps WHERE thread_id = ?")

     

       127
       +
       			.get(threadId) as ThreadInfo | null;

     

       128
       +
       	},

     

       129
       +
       

     

       130
       +
       	update(threadTs: string, threadId: string, slackChannelId: string, timestamp: number): void {

     

       131
       +
       		db.run(

     

       132
       +
       			"INSERT OR REPLACE INTO thread_timestamps (thread_ts, thread_id, slack_channel_id, last_message_time) VALUES (?, ?, ?, ?)",

     

       133
       +
       			[threadTs, threadId, slackChannelId, timestamp],

     

       134
       +
       		);

     

       135
       +
       	},

     

       136
       +
       

     

       137
       +
       	cleanup(olderThan: number): void {

     

       138
       +
       		db.run("DELETE FROM thread_timestamps WHERE last_message_time < ?", [

     

       139
       +
       			olderThan,

     

       140
       +
       		]);

     

       141
        
       	},

     

       142
        
       };

     

       143

+51

src/lib/threads.ts

···

       1
       +
       import { threadTimestamps } from "./db";

     

       2
       +
       

     

       3
       +
       const THREAD_TIMEOUT_MS = 10 * 60 * 1000; // 10 minutes

     

       4
       +
       

     

       5
       +
       /**

     

       6
       +
        * Generate a short 5-character thread ID from thread_ts

     

       7
       +
        */

     

       8
       +
       export function generateThreadId(threadTs: string): string {

     

       9
       +
       	let hash = 0;

     

       10
       +
       	for (let i = 0; i < threadTs.length; i++) {

     

       11
       +
       		hash = (hash << 5) - hash + threadTs.charCodeAt(i);

     

       12
       +
       		hash = hash & hash;

     

       13
       +
       	}

     

       14
       +
       	// Convert to base36 and take first 5 characters

     

       15
       +
       	return Math.abs(hash).toString(36).substring(0, 5);

     

       16
       +
       }

     

       17
       +
       

     

       18
       +
       /**

     

       19
       +
        * Check if this is the first message in a thread (thread doesn't exist in DB yet)

     

       20
       +
        */

     

       21
       +
       export function isFirstThreadMessage(threadTs: string): boolean {

     

       22
       +
       	const thread = threadTimestamps.get(threadTs);

     

       23
       +
       	return !thread;

     

       24
       +
       }

     

       25
       +
       

     

       26
       +
       /**

     

       27
       +
        * Get thread info by thread ID

     

       28
       +
        */

     

       29
       +
       export function getThreadByThreadId(threadId: string) {

     

       30
       +
       	return threadTimestamps.getByThreadId(threadId);

     

       31
       +
       }

     

       32
       +
       

     

       33
       +
       /**

     

       34
       +
        * Update the last message time for a thread

     

       35
       +
        */

     

       36
       +
       export function updateThreadTimestamp(

     

       37
       +
       	threadTs: string,

     

       38
       +
       	slackChannelId: string,

     

       39
       +
       ): string {

     

       40
       +
       	const threadId = generateThreadId(threadTs);

     

       41
       +
       	threadTimestamps.update(threadTs, threadId, slackChannelId, Date.now());

     

       42
       +
       	return threadId;

     

       43
       +
       }

     

       44
       +
       

     

       45
       +
       /**

     

       46
       +
        * Clean up old thread entries (optional, for memory management)

     

       47
       +
        */

     

       48
       +
       export function cleanupOldThreads(): void {

     

       49
       +
       	const cutoff = Date.now() - THREAD_TIMEOUT_MS * 2;

     

       50
       +
       	threadTimestamps.cleanup(cutoff);

     

       51
       +
       }