Refactor all auth adapters to reduce duplications (#4954)

* Refactor all auth adapters to reduce duplications

* Adds mocking and proper testing for all auth adapters

* Proper testing of the google auth adapter

* noit

src/Adapters/Auth/weibo.js

@@ -1,5 +1,5 @@
 // Helper functions for accessing the weibo Graph API.
-var https = require('https');
+var httpsRequest = require('./httpsRequest');
 var Parse = require('parse/node').Parse;
 var querystring = require('querystring');
 
@@ -20,42 +20,19 @@ function validateAppId() {
 
 // A promisey wrapper for weibo graph requests.
 function graphRequest(access_token) {
-  return new Promise(function (resolve, reject) {
-    var postData = querystring.stringify({
-      "access_token":access_token
-    });
-    var options = {
-      hostname: 'api.weibo.com',
-      path: '/oauth2/get_token_info',
-      method: 'POST',
-      headers: {
-        'Content-Type': 'application/x-www-form-urlencoded',
-        'Content-Length': Buffer.byteLength(postData)
-      }
-    };
-    var req = https.request(options, function(res){
-      var data = '';
-      res.on('data', function (chunk) {
-        data += chunk;
-      });
-      res.on('end', function () {
-        try {
-          data = JSON.parse(data);
-        } catch(e) {
-          return reject(e);
-        }
-        resolve(data);
-      });
-      res.on('error', function () {
-        reject('Failed to validate this access token with weibo.');
-      });
-    });
-    req.on('error', function () {
-      reject('Failed to validate this access token with weibo.');
-    });
-    req.write(postData);
-    req.end();
+  var postData = querystring.stringify({
+    "access_token": access_token
   });
+  var options = {
+    hostname: 'api.weibo.com',
+    path: '/oauth2/get_token_info',
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/x-www-form-urlencoded',
+      'Content-Length': Buffer.byteLength(postData)
+    }
+  };
+  return httpsRequest.request(options, postData);
 }
 
 module.exports = {