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<?php
/*
* Copyright 2015 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;
trait CacheTrait
{
private $maxKeyLength = 64;
/**
* Gets the cached value if it is present in the cache when that is
* available.
*/
private function getCachedValue($k)
{
if (is_null($this->cache)) {
return;
}
$key = $this->getFullCacheKey($k);
if (is_null($key)) {
return;
}
$cacheItem = $this->cache->getItem($key);
if ($cacheItem->isHit()) {
return $cacheItem->get();
}
}
/**
* Saves the value in the cache when that is available.
*/
private function setCachedValue($k, $v)
{
if (is_null($this->cache)) {
return;
}
$key = $this->getFullCacheKey($k);
if (is_null($key)) {
return;
}
$cacheItem = $this->cache->getItem($key);
$cacheItem->set($v);
$cacheItem->expiresAfter($this->cacheConfig['lifetime']);
return $this->cache->save($cacheItem);
}
private function getFullCacheKey($key)
{
if (is_null($key)) {
return;
}
$key = $this->cacheConfig['prefix'] . $key;
// ensure we do not have illegal characters
$key = preg_replace('|[^a-zA-Z0-9_\.!]|', '', $key);
// Hash keys if they exceed $maxKeyLength (defaults to 64)
if ($this->maxKeyLength && strlen($key) > $this->maxKeyLength) {
$key = substr(hash('sha256', $key), 0, $this->maxKeyLength);
}
return $key;
}
}