snapshot of https://github.com/RocketChat/Rocket.Chat.git (develop, 2026-09-16; blobs > 131072B omitted)

apps/meteor/server/slashcommands/join/index.ts

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+import './server';

apps/meteor/server/slashcommands/join/server.ts

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+import { api, Room } from '@rocket.chat/core-services';
+import type { SlashCommandCallbackParams } from '@rocket.chat/core-typings';
+import { Rooms, Subscriptions, Users } from '@rocket.chat/models';
+import { Meteor } from 'meteor/meteor';
+
+import { i18n } from '../../lib/i18n';
+import { slashCommands } from '../../lib/utils/slashCommand';
+import { settings } from '../../settings';
+
+slashCommands.add({
+	command: 'join',
+	callback: async ({ params, message, userId }: SlashCommandCallbackParams<'join'>): Promise<void> => {
+		let channel = params.trim();
+		if (channel === '') {
+			return;
+		}
+
+		if (!userId) {
+			return;
+		}
+
+		channel = channel.replace('#', '');
+
+		const room = await Rooms.findOneByNameAndType(channel, 'c');
+		if (!room) {
+			void api.broadcast('notify.ephemeralMessage', userId, message.rid, {
+				msg: i18n.t('Channel_doesnt_exist', {
+					interpolation: { escapeValue: false },
+					channelName: channel,
+					lng: settings.get('Language') || 'en',
+				}),
+			});
+			return;
+		}
+
+		const subscription = await Subscriptions.findOneByRoomIdAndUserId(room._id, userId, {
+			projection: { _id: 1 },
+		});
+
+		if (subscription) {
+			throw new Meteor.Error('error-user-already-in-room', 'You are already in the channel', {
+				method: 'slashCommands',
+			});
+		}
+
+		const user = await Users.findOneById(userId);
+		if (!user) {
+			throw new Meteor.Error('error-invalid-user', 'Invalid user', {
+				method: 'slashCommands',
+			});
+		}
+		await Room.join({ room, user });
+	},
+	options: {
+		description: 'Join_the_given_channel',
+		params: '#channel',
+		permission: 'view-c-room',
+	},
+});