Rocket.Chat/packages/rocketchat-lib/server/functions/updateMessage.js

RocketChat.updateMessage = function(message, user) {
	// For the Rocket.Chat Apps :)
	if (message && Apps && Apps.isLoaded()) {
		const prevent = Promise.await(Apps.getBridges().getListenerBridge().messageEvent('IPreMessageUpdatedPrevent', message));
		if (prevent) {
			throw new Meteor.Error('error-app-prevented-updating', 'A Rocket.Chat App prevented the message updating.');
		}

		let result;
		result = Promise.await(Apps.getBridges().getListenerBridge().messageEvent('IPreMessageUpdatedExtend', message));
		result = Promise.await(Apps.getBridges().getListenerBridge().messageEvent('IPreMessageUpdatedModify', result));

		if (typeof result === 'object') {
			message = Object.assign(message, result);
		}
	}

	// If we keep history of edits, insert a new message to store history information
	if (RocketChat.settings.get('Message_KeepHistory')) {
		RocketChat.models.Messages.cloneAndSaveAsHistoryById(message._id);
	}

	message.editedAt = new Date();
	message.editedBy = {
		_id: user._id,
		username: user.username,
	};

	const urls = message.msg.match(/([A-Za-z]{3,9}):\/\/([-;:&=\+\$,\w]+@{1})?([-A-Za-z0-9\.]+)+:?(\d+)?((\/[-\+=!:~%\/\.@\,\w]*)?\??([-\+=&!:;%@\/\.\,\w]+)?(?:#([^\s\)]+))?)?/g) || [];
	message.urls = urls.map((url) => ({ url }));

	message = RocketChat.callbacks.run('beforeSaveMessage', message);

	const tempid = message._id;
	delete message._id;

	RocketChat.models.Messages.update({ _id: tempid }, { $set: message });

	const room = RocketChat.models.Rooms.findOneById(message.rid);

	if (Apps && Apps.isLoaded()) {
		// This returns a promise, but it won't mutate anything about the message
		// so, we don't really care if it is successful or fails
		Apps.getBridges().getListenerBridge().messageEvent('IPostMessageUpdated', message);
	}

	Meteor.defer(function() {
		RocketChat.callbacks.run('afterSaveMessage', RocketChat.models.Messages.findOneById(tempid), room, user._id);
	});
};