proxy requests to mail server

src/routes/mailserver.js

@@ -0,0 +1,43 @@
+'use strict';
+
+exports = module.exports = {
+    proxy
+};
+
+var addons = require('../addons.js'),
+    assert = require('assert'),
+    BoxError = require('../boxerror.js'),
+    middleware = require('../middleware/index.js'),
+    HttpError = require('connect-lastmile').HttpError,
+    url = require('url');
+
+function proxy(req, res, next) {
+    assert.strictEqual(typeof req.params.pathname, 'string');
+
+    let parsedUrl = url.parse(req.url, true /* parseQueryString */);
+
+    // do not proxy protected values
+    delete parsedUrl.query['access_token'];
+    delete req.headers['authorization'];
+    delete req.headers['cookies'];
+
+    addons.getServiceDetails('mail', 'CLOUDRON_MAIL_TOKEN', function (error, addonDetails) {
+        if (error) return next(BoxError.toHttpError(error));
+
+        parsedUrl.query['access_token'] = addonDetails.token;
+        req.url = url.format({ pathname: req.params.pathname, query: parsedUrl.query });
+
+        const proxyOptions = url.parse(`https://${addonDetails.ip}:3000`);
+        proxyOptions.rejectUnauthorized = false;
+        const mailserverProxy = middleware.proxy(proxyOptions);
+
+        mailserverProxy(req, res, function (error) {
+            if (!error) return next();
+
+            if (error.code === 'ECONNREFUSED') return next(new HttpError(424, 'Unable to connect to mail server'));
+            if (error.code === 'ECONNRESET') return next(new HttpError(424, 'Unable to query mail server'));
+
+            next(new HttpError(500, error));
+        });
+    });
+}