Fix multipart bodies vanishing

lib/auth/oauth2client.js

@@ -135,7 +135,7 @@ OAuth2Client.prototype.refreshAccessToken =
   function(callback) {
     var that = this;
 
-    if (! this.credentials.refresh_token){
+    if (! this.credentials.refresh_token) {
       throw new Error('No refresh token is set');
     }
 
@@ -189,6 +189,14 @@ OAuth2Client.prototype.request =
   opts.headers['Authorization']
       = credentials.token_type + ' ' + credentials.access_token;
 
+  // Make a reference copy of the multipart bodies
+  var bodies = [];
+  if (opts.multipart) {
+    opts.multipart.forEach(function(part) {
+      bodies.push(part.body);
+    });
+  }
+
   this.transporter.request(opts, function(err, body, res) {
     // TODO: Check if it's not userRateLimitExceeded
     var hasAuthError = res.statusCode == 401 || res.statusCode == 403;
@@ -203,6 +211,12 @@ OAuth2Client.prototype.request =
           var tokens = result;
           tokens.refresh_token = credentials.refresh_token;
           that.credentials = tokens;
+
+          // Refresh the bodies
+          bodies.forEach(function(body, i) {
+            opts.multipart[i].body = body;
+          });
+
           that.request(opts, opt_callback, true);
         }
       });