Auth Adapters refactoring (#3177)

* Moves all authentication providers to Adapter/Auth

* refactors specs

* Deprecates oauth option in favor of auth option

- Deprecates facebookAppIds option (in favor of auth.facebook.appIds)
- Adds warnings about the deprecated options

* nits

src/Adapters/Auth/vkontakte.js

@@ -0,0 +1,62 @@
+'use strict';
+
+// Helper functions for accessing the vkontakte API.
+
+var https = require('https');
+var Parse = require('parse/node').Parse;
+var logger = require('../../logger').default;
+
+// Returns a promise that fulfills iff this user id is valid.
+function validateAuthData(authData, params) {
+  return vkOAuth2Request(params).then(function (response) {
+    if (response && response && response.access_token) {
+      return request("api.vk.com", "method/secure.checkToken?token=" + authData.access_token + "&client_secret=" + params.appSecret + "&access_token=" + response.access_token).then(function (response) {
+        if (response && response.response && response.response.user_id == authData.id) {
+          return;
+        }
+        throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Vk auth is invalid for this user.');
+      });
+    }
+    logger.error('Vk Auth', 'Vk appIds or appSecret is incorrect.');
+    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Vk appIds or appSecret is incorrect.');
+  });
+}
+
+function vkOAuth2Request(params) {
+  var promise = new Parse.Promise();
+  return promise.then(function(){
+    if (!params || !params.appIds || !params.appIds.length || !params.appSecret || !params.appSecret.length) {
+      logger.error('Vk Auth', 'Vk auth is not configured. Missing appIds or appSecret.');
+      throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Vk auth is not configured. Missing appIds or appSecret.');
+    }
+    return request("oauth.vk.com", "access_token?client_id=" + params.appIds + "&client_secret=" + params.appSecret + "&v=5.59&grant_type=client_credentials")
+  })
+}
+
+// Returns a promise that fulfills iff this app id is valid.
+function validateAppId() {
+  return Promise.resolve();
+}
+
+// A promisey wrapper for api requests
+function request(host, path) {
+  return new Promise(function (resolve, reject) {
+    https.get("https://" + host + "/" + 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 () {
+      reject('Failed to validate this access token with Vk.');
+    });
+  });
+}
+
+module.exports = {
+  validateAppId: validateAppId,
+  validateAuthData: validateAuthData
+};