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<?php
/*
* Copyright 2020 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.
*/
namespace Google\Auth;
use Google\Auth\Credentials\GCECredentials;
use Psr\Cache\CacheItemPoolInterface;
/**
* A class to implement caching for calls to GCECredentials::onGce. This class
* is used automatically when you pass a `Psr\Cache\CacheItemPoolInterface`
* cache object to `ApplicationDefaultCredentials::getCredentials`.
*
* ```
* $sysvCache = new Google\Auth\SysvCacheItemPool();
* $creds = Google\Auth\ApplicationDefaultCredentials::getCredentials(
* $scope,
* null,
* null,
* $sysvCache
* );
* ```
*/
class GCECache
{
const GCE_CACHE_KEY = 'google_auth_on_gce_cache';
use CacheTrait;
/**
* @var array
*/
private $cacheConfig;
/**
* @var CacheItemPoolInterface
*/
private $cache;
/**
* @param array $cacheConfig Configuration for the cache
* @param CacheItemPoolInterface $cache
*/
public function __construct(
array $cacheConfig = null,
CacheItemPoolInterface $cache = null
) {
$this->cache = $cache;
$this->cacheConfig = array_merge([
'lifetime' => 1500,
'prefix' => '',
], (array) $cacheConfig);
}
/**
* Caches the result of onGce so the metadata server is not called multiple
* times.
*
* @param callable $httpHandler callback which delivers psr7 request
* @return bool True if this a GCEInstance, false otherwise
*/
public function onGce(callable $httpHandler = null)
{
if (is_null($this->cache)) {
return GCECredentials::onGce($httpHandler);
}
$cacheKey = self::GCE_CACHE_KEY;
$onGce = $this->getCachedValue($cacheKey);
if (is_null($onGce)) {
$onGce = GCECredentials::onGce($httpHandler);
$this->setCachedValue($cacheKey, $onGce);
}
return $onGce;
}
}