Firebase authentication provider is implemented

package.json

@@ -23,7 +23,9 @@
     "commander": "2.9.0",
     "deepcopy": "0.6.3",
     "express": "4.14.0",
+    "firebase-admin": "^4.0.3",
     "intersect": "1.0.1",
+    "jsonwebtoken": "7.2.0",
     "lodash": "4.17.2",
     "lru-cache": "4.0.2",
     "mime": "1.3.4",

src/authDataManager/firebase.js

@@ -0,0 +1,53 @@
+// Firebase authentication provider
+var https = require('https');
+var jwt = require("jsonwebtoken");
+
+// Returns a promise that fulfills iff this user id is valid.
+function validateAuthData(authData) {
+  return request().then(function (response) {
+    var publicKey = response[Object.keys(response)[0]]
+    try {
+      var decodedToken = jwt.verify(authData.access_token, publicKey);
+      console.log(authData)
+
+      if (decodedToken == null || decodedToken.id == null || decodedToken.id == "") {
+        throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Google auth is invalid for this user.');
+      }
+      resolve(decodedToken);
+    } catch (error) {
+      throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, "Token validation error");
+    }
+
+    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Google auth is invalid for this user.');
+
+  });
+}
+
+// A promisey wrapper for api requests
+function request() {
+  return new Promise(function (resolve, reject) {
+    var googlePublicKeyUrl = "https://www.googleapis.com/robot/v1/metadata/x509/[email protected]";
+    https.get(googlePublicKeyUrl, function (res) {
+      var data = '';
+      res.on('data', function (chunk) {
+        data += chunk;
+      });
+      res.on('end', function () {
+        data = JSON.parse(data);
+        resolve(data);
+      });
+    }).on('error', function () {
+      reject('Failed to validate this access token with Google.');
+    });
+  });
+}
+
+// Returns a promise that fulfills if this app id is valid.
+function validateAppId() {
+  return Promise.resolve();
+}
+
+module.exports = {
+  validateAppId,
+  validateAuthData
+};

src/authDataManager/index.js

@@ -13,6 +13,7 @@ let vkontakte = require("./vkontakte");
 let qq = require("./qq");
 let wechat = require("./wechat");
 let weibo = require("./weibo");
+let firebase = require("./firebase");
 
 let anonymous = {
   validateAuthData: () => {
@@ -39,7 +40,8 @@ let providers = {
   vkontakte,
   qq,
   wechat,
-  weibo
+  weibo,
+  firebase
 }
 
 module.exports = function(oauthOptions = {}, enableAnonymousUsers = true) {