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<?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;
}
}
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