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✏️ Editing: MemoryCacheItemPool.php

<?php
/*
 * Copyright 2016 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\Cache;

use Psr\Cache\CacheItemInterface;
use Psr\Cache\CacheItemPoolInterface;

/**
 * Simple in-memory cache implementation.
 */
final class MemoryCacheItemPool implements CacheItemPoolInterface
{
    /**
     * @var CacheItemInterface[]
     */
    private $items;

/**
     * @var CacheItemInterface[]
     */
    private $deferredItems;

/**
     * {@inheritdoc}
     *
     * @return CacheItemInterface The corresponding Cache Item.
     */
    public function getItem($key): CacheItemInterface
    {
        return current($this->getItems([$key]));  // @phpstan-ignore-line
    }

/**
     * {@inheritdoc}
     *
     * @return iterable<CacheItemInterface>
     *   A traversable collection of Cache Items keyed by the cache keys of
     *   each item. A Cache item will be returned for each key, even if that
     *   key is not found. However, if no keys are specified then an empty
     *   traversable MUST be returned instead.
     */
    public function getItems(array $keys = []): iterable
    {
        $items = [];
        foreach ($keys as $key) {
            $items[$key] = $this->hasItem($key) ? clone $this->items[$key] : new TypedItem($key);
        }

return $items;
    }

/**
     * {@inheritdoc}
     *
     * @return bool
     *   True if item exists in the cache, false otherwise.
     */
    public function hasItem($key): bool
    {
        $this->isValidKey($key);

return isset($this->items[$key]) && $this->items[$key]->isHit();
    }

/**
     * {@inheritdoc}
     *
     * @return bool
     *   True if the pool was successfully cleared. False if there was an error.
     */
    public function clear(): bool
    {
        $this->items = [];
        $this->deferredItems = [];

return true;
    }

/**
     * {@inheritdoc}
     *
     * @return bool
     *   True if the item was successfully removed. False if there was an error.
     */
    public function deleteItem($key): bool
    {
        return $this->deleteItems([$key]);
    }

/**
     * {@inheritdoc}
     *
     * @return bool
     *   True if the items were successfully removed. False if there was an error.
     */
    public function deleteItems(array $keys): bool
    {
        array_walk($keys, [$this, 'isValidKey']);

foreach ($keys as $key) {
            unset($this->items[$key]);
        }

return true;
    }

/**
     * {@inheritdoc}
     *
     * @return bool
     *   True if the item was successfully persisted. False if there was an error.
     */
    public function save(CacheItemInterface $item): bool
    {
        $this->items[$item->getKey()] = $item;

return true;
    }

/**
     * {@inheritdoc}
     *
     * @return bool
     *   False if the item could not be queued or if a commit was attempted and failed. True otherwise.
     */
    public function saveDeferred(CacheItemInterface $item): bool
    {
        $this->deferredItems[$item->getKey()] = $item;

return true;
    }

/**
     * {@inheritdoc}
     *
     * @return bool
     *   True if all not-yet-saved items were successfully saved or there were none. False otherwise.
     */
    public function commit(): bool
    {
        foreach ($this->deferredItems as $item) {
            $this->save($item);
        }

$this->deferredItems = [];

return true;
    }

/**
     * Determines if the provided key is valid.
     *
     * @param string $key
     * @return bool
     * @throws InvalidArgumentException
     */
    private function isValidKey($key)
    {
        $invalidCharacters = '{}()/\\\\@:';

if (!is_string($key) || preg_match("#[$invalidCharacters]#", $key)) {
            throw new InvalidArgumentException('The provided key is not valid: ' . var_export($key, true));
        }

return true;
    }
}

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