[FIX] Proxy upload to correct instance

packages/rocketchat-file-upload/package.js

@@ -31,6 +31,7 @@ Package.onUse(function(api) {
 	api.addFiles('client/lib/fileUploadHandler.js', 'client');
 
 	api.addFiles('server/lib/FileUpload.js', 'server');
+	api.addFiles('server/lib/proxy.js', 'server');
 	api.addFiles('server/lib/requests.js', 'server');
 
 	api.addFiles('server/config/_configUploadStorage.js', 'server');

packages/rocketchat-file-upload/server/lib/proxy.js

@@ -0,0 +1,91 @@
+/* globals UploadFS, InstanceStatus */
+
+import http from 'http';
+import URL from 'url';
+
+const logger = new Logger('UploadProxy');
+
+WebApp.connectHandlers.stack.unshift({
+	route: '',
+	handle: Meteor.bindEnvironment(function(req, res, next) {
+		// Quick check to see if request should be catch
+		if (req.url.indexOf(UploadFS.config.storesPath) === -1) {
+			return next();
+		}
+
+		logger.debug('Upload URL:', req.url);
+
+		if (req.method !== 'POST') {
+			return next();
+		}
+
+		// Remove store path
+		const parsedUrl = URL.parse(req.url);
+		const path = parsedUrl.pathname.substr(UploadFS.config.storesPath.length + 1);
+
+		// Get store
+		const regExp = new RegExp('^\/([^\/\?]+)\/([^\/\?]+)$');
+		const match = regExp.exec(path);
+
+		// Request is not valid
+		if (match === null) {
+			res.writeHead(400);
+			res.end();
+			return;
+		}
+
+		// Get store
+		const store = UploadFS.getStore(match[1]);
+		if (!store) {
+			res.writeHead(404);
+			res.end();
+			return;
+		}
+
+		// Get file
+		const fileId = match[2];
+		const file = store.getCollection().findOne({_id: fileId});
+		if (file === undefined) {
+			res.writeHead(404);
+			res.end();
+			return;
+		}
+
+		if (file.instanceId === InstanceStatus.id()) {
+			logger.debug('Correct instance');
+			return next();
+		}
+
+		// Proxy to other instance
+		const instance = InstanceStatus.getCollection().findOne({_id: file.instanceId});
+
+		if (instance == null) {
+			res.writeHead(404);
+			res.end();
+			return;
+		}
+
+		if (instance.extraInformation.host === process.env.INSTANCE_IP && RocketChat.isDocker() === false) {
+			instance.extraInformation.host = 'localhost';
+		}
+
+		logger.debug('Wrong instance, proxing to:', `${ instance.extraInformation.host }:${ instance.extraInformation.port }`);
+
+		const options = {
+			hostname: instance.extraInformation.host,
+			port: instance.extraInformation.port,
+			path: req.url,
+			method: 'POST'
+		};
+
+		const proxy = http.request(options, function(proxy_res) {
+			proxy_res.pipe(res, {
+				end: true
+			});
+		});
+
+		req.pipe(proxy, {
+			end: true
+		});
+	})
+});

packages/rocketchat-lib/server/models/Avatars.js

@@ -1,7 +1,13 @@
+/* globals InstanceStatus */
+
 RocketChat.models.Avatars = new class extends RocketChat.models._Base {
 	constructor() {
 		super('avatars');
 
+		this.model.before.insert((userId, doc) => {
+			doc.instanceId = InstanceStatus.id();
+		});
+
 		this.tryEnsureIndex({ name: 1 });
 	}
 

packages/rocketchat-lib/server/models/Uploads.js

@@ -1,7 +1,13 @@
+/* globals InstanceStatus */
+
 RocketChat.models.Uploads = new class extends RocketChat.models._Base {
 	constructor() {
 		super('uploads');
 
+		this.model.before.insert((userId, doc) => {
+			doc.instanceId = InstanceStatus.id();
+		});
+
 		this.tryEnsureIndex({ 'rid': 1 });
 		this.tryEnsureIndex({ 'uploadedAt': 1 });
 	}

server/startup/avatar.js

@@ -1,4 +1,5 @@
 /* globals FileUpload */
+
 Meteor.startup(function() {
 	WebApp.connectHandlers.use('/avatar/', Meteor.bindEnvironment(function(req, res/*, next*/) {
 		const params = {