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