vk.com auth data manager implemented (#2578)

src/authDataManager/vkontakte.js

@@ -0,0 +1,43 @@
+'use strict';
+
+// Helper functions for accessing the instagram API.
+var https = require('https');
+var Parse = require('parse/node').Parse;
+
+// Returns a promise that fulfills iff this user id is valid.
+function validateAuthData(authData) {
+  return request("users.get?v=V&access_token=" + authData.access_token).then(function (response) {
+    if (response && response.response && response.response[0].uid == authData.id) {
+      return;
+    }
+    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Vk auth is invalid for this user.');
+  });
+}
+
+// Returns a promise that fulfills iff this app id is valid.
+function validateAppId() {
+  return Promise.resolve();
+}
+
+// A promisey wrapper for api requests
+function request(path) {
+  return new Promise(function (resolve, reject) {
+    https.get("https://api.vk.com/method/" + path, function (res) {
+      var data = '';
+      res.on('data', function (chunk) {
+        data += chunk;
+      });
+      res.on('end', function () {
+        data = JSON.parse(data);
+        resolve(data);
+      });
+    }).on('error', function (e) {
+      reject('Failed to validate this access token with Vk.');
+    });
+  });
+}
+
+module.exports = {
+  validateAppId: validateAppId,
+  validateAuthData: validateAuthData
+};