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<?php
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/*
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* Copyright 2010 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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namespace Google\Auth;
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use Psr\Cache\CacheItemPoolInterface;
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/**
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* A class to implement caching for any object implementing
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* FetchAuthTokenInterface
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*/
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class FetchAuthTokenCache implements FetchAuthTokenInterface
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{
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use CacheTrait;
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/**
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* @var FetchAuthTokenInterface
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*/
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private $fetcher;
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/**
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* @var array
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*/
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private $cacheConfig;
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/**
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* @var CacheItemPoolInterface
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*/
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private $cache;
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public function __construct(
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FetchAuthTokenInterface $fetcher,
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array $cacheConfig = null,
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CacheItemPoolInterface $cache
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) {
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$this->fetcher = $fetcher;
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$this->cache = $cache;
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$this->cacheConfig = array_merge([
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'lifetime' => 1500,
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'prefix' => '',
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], (array) $cacheConfig);
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}
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/**
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* Implements FetchAuthTokenInterface#fetchAuthToken.
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*
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* Checks the cache for a valid auth token and fetches the auth tokens
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* from the supplied fetcher.
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*
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* @param callable $httpHandler callback which delivers psr7 request
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*
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* @return array the response
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*
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* @throws \Exception
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*/
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public function fetchAuthToken(callable $httpHandler = null)
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{
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// Use the cached value if its available.
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//
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// TODO: correct caching; update the call to setCachedValue to set the expiry
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// to the value returned with the auth token.
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//
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// TODO: correct caching; enable the cache to be cleared.
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$cacheKey = $this->fetcher->getCacheKey();
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$cached = $this->getCachedValue($cacheKey);
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if (!empty($cached)) {
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return ['access_token' => $cached];
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}
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$auth_token = $this->fetcher->fetchAuthToken($httpHandler);
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if (isset($auth_token['access_token'])) {
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$this->setCachedValue($cacheKey, $auth_token['access_token']);
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}
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return $auth_token;
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}
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/**
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* @return string
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*/
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public function getCacheKey()
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{
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return $this->getFullCacheKey($this->fetcher->getCacheKey());
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}
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/**
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* @return array|null
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*/
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public function getLastReceivedToken()
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{
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return $this->fetcher->getLastReceivedToken();
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}
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}
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