Rocket.Chat/app/file-upload/lib/FileUploadBase.js

import path from 'path';

import { Meteor } from 'meteor/meteor';
import { Random } from 'meteor/random';
import { UploadFS } from 'meteor/jalik:ufs';
import _ from 'underscore';

import { canAccessRoom, hasPermission } from '../../authorization';
import { settings } from '../../settings';

// set ufs temp dir to $TMPDIR/ufs instead of /tmp/ufs if the variable is set
if ('TMPDIR' in process.env) {
	UploadFS.config.tmpDir = path.join(process.env.TMPDIR, 'ufs');
}

UploadFS.config.defaultStorePermissions = new UploadFS.StorePermissions({
	insert(userId, doc) {
		if (userId) {
			return true;
		}

		// allow inserts from slackbridge (message_id = slack-timestamp-milli)
		if (doc && doc.message_id && doc.message_id.indexOf('slack-') === 0) {
			return true;
		}

		// allow inserts to the UserDataFiles store
		if (doc && doc.store && doc.store.split(':').pop() === 'UserDataFiles') {
			return true;
		}

		if (canAccessRoom(null, null, doc)) {
			return true;
		}

		return false;
	},
	update(userId, doc) {
		return hasPermission(Meteor.userId(), 'delete-message', doc.rid) || (settings.get('Message_AllowDeleting') && userId === doc.userId);
	},
	remove(userId, doc) {
		return hasPermission(Meteor.userId(), 'delete-message', doc.rid) || (settings.get('Message_AllowDeleting') && userId === doc.userId);
	},
});

export class FileUploadBase {
	constructor(store, meta, file) {
		this.id = Random.id();
		this.meta = meta;
		this.file = file;
		this.store = store;
	}

	getProgress() {}

	getFileName() {
		return this.meta.name;
	}

	start(callback) {
		this.handler = new UploadFS.Uploader({
			store: this.store,
			data: this.file,
			file: this.meta,
			onError: (err) => callback(err),
			onComplete: (fileData) => {
				const file = _.pick(fileData, '_id', 'type', 'size', 'name', 'identify', 'description');

				file.url = fileData.url.replace(Meteor.absoluteUrl(), '/');
				return callback(null, file, this.store.options.name);
			},
		});

		this.handler.onProgress = (file, progress) => {
			this.onProgress(progress);
		};

		return this.handler.start();
	}

	onProgress() {}

	stop() {
		return this.handler.stop();
	}
}