Added support for oauth authentication for couchdb

This is used when google auth is used for authentication.

forward.js

@@ -1,21 +1,35 @@
 var onHeaders = require('on-headers');
 var request = require('request');
 
-module.exports = function(host, config) {
+module.exports = function(host, config, useOauth) {
   return function(req, res) {
     var forwardURL = host + req.url;
+    var requestOptions = {
+      url: forwardURL
+    };
     var reqMethod = req.method.toLowerCase();
     if (reqMethod == 'delete') {
       reqMethod = 'del';
     }
+    if (config.useGoogleAuth && useOauth) {
+      if (req.get('x-oauth-consumer-key')) {
+        requestOptions.oauth = {
+          consumer_key: req.get('x-oauth-consumer-key'),
+          consumer_secret: req.get('x-oauth-consumer-secret'),
+          token: req.get('x-oauth-token'),
+          token_secret: req.get('x-oauth-token-secret')
+        };
+      }
+    }
+
     if (config.emberCLI) {
       // Ember CLI uses compression (https://www.npmjs.com/package/compression) which
       // causes issues when proxying requests, so turn off compression for proxied requests.
       onHeaders(res, function() {
         res.header('Cache-Control','no-transform');
       });
     }
-    req.pipe(request[reqMethod](forwardURL).on('error', function(err) {
+    req.pipe(request[reqMethod](requestOptions).on('error', function(err) {
       console.log('Got error forwarding: ', err);
     })).pipe(res);
   };

routes/10-couchproxy.js

@@ -1,5 +1,5 @@
 var forward = require('../forward.js');
 
 module.exports = function(app, config) {
-  app.use('/db/', forward(config.couchDbURL, config));
+  app.use('/db/', forward(config.couchDbURL, config, true));
 };