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<?php
/*
* Copyright 2010 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 Psr\Cache\CacheItemPoolInterface;
/**
* A class to implement caching for any object implementing
* FetchAuthTokenInterface
*/
class FetchAuthTokenCache implements FetchAuthTokenInterface, SignBlobInterface
{
use CacheTrait;
/**
* @var FetchAuthTokenInterface
*/
private $fetcher;
/**
* @var array
*/
private $cacheConfig;
/**
* @var CacheItemPoolInterface
*/
private $cache;
public function __construct(
FetchAuthTokenInterface $fetcher,
array $cacheConfig = null,
CacheItemPoolInterface $cache
) {
$this->fetcher = $fetcher;
$this->cache = $cache;
$this->cacheConfig = array_merge([
'lifetime' => 1500,
'prefix' => '',
], (array) $cacheConfig);
}
/**
* Implements FetchAuthTokenInterface#fetchAuthToken.
*
* Checks the cache for a valid auth token and fetches the auth tokens
* from the supplied fetcher.
*
* @param callable $httpHandler callback which delivers psr7 request
*
* @return array the response
*
* @throws \Exception
*/
public function fetchAuthToken(callable $httpHandler = null)
{
// Use the cached value if its available.
//
// TODO: correct caching; update the call to setCachedValue to set the expiry
// to the value returned with the auth token.
//
// TODO: correct caching; enable the cache to be cleared.
$cacheKey = $this->fetcher->getCacheKey();
$cached = $this->getCachedValue($cacheKey);
if (!empty($cached)) {
return ['access_token' => $cached];
}
$auth_token = $this->fetcher->fetchAuthToken($httpHandler);
if (isset($auth_token['access_token'])) {
$this->setCachedValue($cacheKey, $auth_token['access_token']);
}
return $auth_token;
}
/**
* @return string
*/
public function getCacheKey()
{
return $this->getFullCacheKey($this->fetcher->getCacheKey());
}
/**
* @return array|null
*/
public function getLastReceivedToken()
{
return $this->fetcher->getLastReceivedToken();
}
/**
* Get the client name from the fetcher.
*
* @param callable $httpHandler An HTTP handler to deliver PSR7 requests.
* @return string
*/
public function getClientName(callable $httpHandler = null)
{
return $this->fetcher->getClientName($httpHandler);
}
/**
* Sign a blob using the fetcher.
*
* @param string $stringToSign The string to sign.
* @param bool $forceOpenssl Require use of OpenSSL for local signing. Does
* not apply to signing done using external services. **Defaults to**
* `false`.
* @return string The resulting signature.
* @throws \RuntimeException If the fetcher does not implement
* `Google\Auth\SignBlobInterface`.
*/
public function signBlob($stringToSign, $forceOpenSsl = false)
{
if (!$this->fetcher instanceof SignBlobInterface) {
throw new \RuntimeException(
'Credentials fetcher does not implement ' .
'Google\Auth\SignBlobInterface'
);
}
return $this->fetcher->signBlob($stringToSign, $forceOpenSsl);
}
}