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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| <?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. | ||
| */ | ||
|
|
||
| if (!class_exists('Google_Client')) { | ||
| require_once dirname(__FILE__) . '/../autoload.php'; | ||
| } | ||
|
|
||
| /** | ||
| * Authentication via built-in Compute Engine service accounts. | ||
| * The instance must be pre-configured with a service account | ||
| * and the appropriate scopes. | ||
| * @author Jonathan Parrott <jon.wayne.parrott@gmail.com> | ||
| */ | ||
| class Google_Auth_ComputeEngine extends Google_Auth_Abstract | ||
| { | ||
| const METADATA_AUTH_URL = | ||
| 'http://metadata/computeMetadata/v1/instance/service-accounts/default/token'; | ||
| private $client; | ||
| private $token; | ||
|
|
||
| public function __construct(Google_Client $client, $config = null) | ||
| { | ||
| $this->client = $client; | ||
| } | ||
|
|
||
| /** | ||
| * 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); | ||
| } | ||
|
|
||
| /** | ||
| * @param string $token | ||
| * @throws Google_Auth_Exception | ||
| */ | ||
| public function setAccessToken($token) | ||
| { | ||
| $token = json_decode($token, true); | ||
| if ($token == null) { | ||
| throw new Google_Auth_Exception('Could not json decode the token'); | ||
| } | ||
| if (! isset($token['access_token'])) { | ||
| throw new Google_Auth_Exception("Invalid token format"); | ||
| } | ||
| $token['created'] = time(); | ||
| $this->token = $token; | ||
| } | ||
|
|
||
| public function getAccessToken() | ||
| { | ||
| return json_encode($this->token); | ||
| } | ||
|
|
||
| /** | ||
| * Acquires a new access token from the compute engine metadata server. | ||
| * @throws Google_Auth_Exception | ||
| */ | ||
| public function acquireAccessToken() | ||
| { | ||
| $request = new Google_Http_Request( | ||
| self::METADATA_AUTH_URL, | ||
| 'GET', | ||
| array( | ||
| 'Metadata-Flavor' => 'Google' | ||
| ) | ||
| ); | ||
| $request->disableGzip(); | ||
| $response = $this->client->getIo()->makeRequest($request); | ||
|
|
||
| if ($response->getResponseHttpCode() == 200) { | ||
| $this->setAccessToken($response->getResponseBody()); | ||
| $this->token['created'] = time(); | ||
| return $this->getAccessToken(); | ||
| } else { | ||
| throw new Google_Auth_Exception( | ||
| sprintf( | ||
| "Error fetching service account access token, message: '%s'", | ||
| $response->getResponseBody() | ||
| ), | ||
| $response->getResponseHttpCode() | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Include an accessToken in a given apiHttpRequest. | ||
| * @param Google_Http_Request $request | ||
| * @return Google_Http_Request | ||
| * @throws Google_Auth_Exception | ||
| */ | ||
| public function sign(Google_Http_Request $request) | ||
| { | ||
| if ($this->isAccessTokenExpired()) { | ||
| $this->acquireAccessToken(); | ||
| } | ||
|
|
||
| $this->client->getLogger()->debug('Compute engine service account authentication'); | ||
|
|
||
| $request->setRequestHeaders( | ||
| array('Authorization' => 'Bearer ' . $this->token['access_token']) | ||
| ); | ||
|
|
||
| return $request; | ||
| } | ||
|
|
||
| /** | ||
| * Returns if the access_token is expired. | ||
| * @return bool Returns True if the access_token is expired. | ||
| */ | ||
| public function isAccessTokenExpired() | ||
| { | ||
| if (!$this->token || !isset($this->token['created'])) { | ||
| return true; | ||
| } | ||
|
|
||
| // If the token is set to expire in the next 30 seconds. | ||
| $expired = ($this->token['created'] | ||
| + ($this->token['expires_in'] - 30)) < time(); | ||
|
|
||
| return $expired; | ||
| } | ||
| } |
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