1 files changed, 121 insertions, 0 deletions
diff --git a/includes/google-api-php-client-master/src/Google/Auth/AppIdentity.php b/includes/google-api-php-client-master/src/Google/Auth/AppIdentity.php
new file mode 100644
index 0000000..ba7e720
--- /dev/null
+++ b/includes/google-api-php-client-master/src/Google/Auth/AppIdentity.php
@@ -0,0 +1,121 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * WARNING - this class depends on the Google App Engine PHP library
+ * which is 5.3 and above only, so if you include this in a PHP 5.2
+ * setup or one without 5.3 things will blow up.
+ */
+use google\appengine\api\app_identity\AppIdentityService;
+
+if (!class_exists('Google_Client')) {
+  require_once dirname(__FILE__) . '/../autoload.php';
+}
+
+/**
+ * Authentication via the Google App Engine App Identity service.
+ */
+class Google_Auth_AppIdentity extends Google_Auth_Abstract
+{
+  const CACHE_PREFIX = "Google_Auth_AppIdentity::";
+  private $key = null;
+  private $client;
+  private $token = false;
+  private $tokenScopes = false;
+
+  public function __construct(Google_Client $client, $config = null)
+  {
+    $this->client = $client;
+  }
+
+  /**
+   * Retrieve an access token for the scopes supplied.
+   */
+  public function authenticateForScope($scopes)
+  {
+    if ($this->token && $this->tokenScopes == $scopes) {
+      return $this->token;
+    }
+
+    $cacheKey = self::CACHE_PREFIX;
+    if (is_string($scopes)) {
+      $cacheKey .= $scopes;
+    } else if (is_array($scopes)) {
+      $cacheKey .= implode(":", $scopes);
+    }
+
+    $this->token = $this->client->getCache()->get($cacheKey);
+    if (!$this->token) {
+      $this->retrieveToken($scopes, $cacheKey);
+    } else if ($this->token['expiration_time'] < time()) {
+      $this->client->getCache()->delete($cacheKey);
+      $this->retrieveToken($scopes, $cacheKey);
+    }
+
+    $this->tokenScopes = $scopes;
+    return $this->token;
+  }
+
+  /**
+   * Retrieve a new access token and store it in cache
+   * @param mixed $scopes
+   * @param string $cacheKey
+   */
+  private function retrieveToken($scopes, $cacheKey)
+  {
+    $this->token = AppIdentityService::getAccessToken($scopes);
+    if ($this->token) {
+      $this->client->getCache()->set(
+          $cacheKey,
+          $this->token
+      );
+    }
+  }
+
+  /**
+   * Perform an authenticated / signed apiHttpRequest.
+   * This function takes the apiHttpRequest, calls apiAuth->sign on it
+   * (which can modify the request in what ever way fits the auth mechanism)
+   * and then calls apiCurlIO::makeRequest on the signed request
+   *
+   * @param Google_Http_Request $request
+   * @return Google_Http_Request The resulting HTTP response including the
+   * responseHttpCode, responseHeaders and responseBody.
+   */
+  public function authenticatedRequest(Google_Http_Request $request)
+  {
+    $request = $this->sign($request);
+    return $this->client->getIo()->makeRequest($request);
+  }
+
+  public function sign(Google_Http_Request $request)
+  {
+    if (!$this->token) {
+      // No token, so nothing to do.
+      return $request;
+    }
+
+    $this->client->getLogger()->debug('App Identity authentication');
+
+    // Add the OAuth2 header to the request
+    $request->setRequestHeaders(
+        array('Authorization' => 'Bearer ' . $this->token['access_token'])
+    );
+
+    return $request;
+  }
+}