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O:39:"phpDocumentor\Descriptor\FileDescriptor":23:{s:8:" * fqsen";N;s:7:" * name";s:16:"CachingProxy.php";s:12:" * namespace";s:0:"";s:10:" * package";s:15:"Cover_Generator";s:10:" * summary";s:30:"Caching Proxy for Cover Images";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:676:"PHP version 8

Copyright (C) Villanova University 2015.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2,
as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:17:" * fileDescriptor";N;s:7:" * line";i:0;s:7:" * tags";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:5:{s:8:"category";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:8:"category";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:6:"VuFind";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:7:"package";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:7:"package";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:15:"Cover_Generator";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:6:"author";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:45:"phpDocumentor\Descriptor\Tag\AuthorDescriptor":3:{s:7:" * name";s:6:"author";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:39:"Demian Katz <demian.katz@villanova.edu>";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:7:"license";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:38:"phpDocumentor\Descriptor\TagDescriptor":3:{s:7:" * name";s:7:"license";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:69:"http://opensource.org/licenses/gpl-2.0.php GNU General Public License";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}}}}s:4:"link";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:1:{i:0;O:43:"phpDocumentor\Descriptor\Tag\LinkDescriptor":4:{s:7:" * name";s:4:"link";s:14:" * description";O:55:"phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor":2:{s:68:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor description";O:45:"phpDocumentor\Reflection\DocBlock\Description":2:{s:59:" phpDocumentor\Reflection\DocBlock\Description bodyTemplate";s:4:"Wiki";s:51:" phpDocumentor\Reflection\DocBlock\Description tags";a:0:{}}s:67:" phpDocumentor\Descriptor\DocBlock\DescriptionDescriptor inlineTags";a:0:{}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}s:7:" * link";s:54:"https://vufind.org/wiki/configuration:external_content";}}}}}s:9:" * errors";O:35:"phpDocumentor\Descriptor\Collection":1:{s:8:" * items";a:0:{}}s:19:" * inheritedElement";N;s:7:" * hash";s:32:"6d1cd96304843538f78cf21c85e7b63e";s:7:" * path";s:40:"VuFind/src/VuFind/Cover/CachingProxy.php";s:9:" * source";s:4644:"<?php

/**
 * Caching Proxy for Cover Images
 *
 * PHP version 8
 *
 * Copyright (C) Villanova University 2015.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category VuFind
 * @package  Cover_Generator
 * @author   Demian Katz <demian.katz@villanova.edu>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://vufind.org/wiki/configuration:external_content Wiki
 */

namespace VuFind\Cover;

use Laminas\Http\Client;
use Laminas\Http\Response;

use function dirname;

/**
 * Caching Proxy for Cover Images
 *
 * @category VuFind
 * @package  Cover_Generator
 * @author   Demian Katz <demian.katz@villanova.edu>
 * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
 * @link     https://vufind.org/wiki/configuration:external_content Wiki
 */
class CachingProxy
{
    /**
     * HTTP client
     *
     * @var Client
     */
    protected $client;

    /**
     * Base directory for cache
     *
     * @var string
     */
    protected $cache;

    /**
     * Array of regular expressions for hosts to cache
     *
     * @var array
     */
    protected $allowedHosts;

    /**
     * Constructor
     *
     * @param Client  $client       HTTP client
     * @param ?string $cache        Base directory for cache (null to disable caching)
     * @param array   $allowedHosts Array of regular expressions for hosts to cache
     */
    public function __construct(Client $client, $cache, array $allowedHosts = [])
    {
        $this->client = $client;
        $this->cache = $cache;
        $this->allowedHosts = $allowedHosts;
    }

    /**
     * Fetch an image from either a URL or the cache (as appropriate).
     *
     * @param string $url URL to fetch
     *
     * @return Response
     */
    public function fetch($url)
    {
        $file = $this->getCacheFile($url);
        $cacheAllowed = $this->cache && $this->hasLegalHost($url);
        if (!$cacheAllowed || !($response = $this->fetchCache($file))) {
            $response = $this->client->setUri($url)->send();
            if ($cacheAllowed) {
                $this->setCache($file, $response);
            }
        }
        return $response;
    }

    /**
     * Load a response from cache (or return false if cache is missing).
     *
     * @param string $file Cache file to load
     *
     * @return bool|Response
     */
    protected function fetchCache($file)
    {
        return file_exists($file)
            ? unserialize(file_get_contents($file))
            : false;
    }

    /**
     * Save a response to the cache.
     *
     * @param string   $file     Filename to update
     * @param Response $response Response to write
     *
     * @return void
     */
    protected function setCache($file, Response $response)
    {
        if (!$this->cache) {
            return; // don't write if cache is disabled
        }
        if (!file_exists($this->cache)) {
            mkdir($this->cache);
        }
        if (!file_exists(dirname($file))) {
            mkdir(dirname($file));
        }
        file_put_contents($file, serialize($response));
    }

    /**
     * Check if the URL is on the configured list for caching.
     *
     * @param string $url URL to check
     *
     * @return bool
     */
    protected function hasLegalHost($url)
    {
        $host = parse_url($url, PHP_URL_HOST);
        foreach ($this->allowedHosts as $current) {
            if (preg_match($current, $host)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Get the cache filename corresponding with the provided URL.
     *
     * @param string $url URL
     *
     * @return string
     * @throws \Exception
     */
    protected function getCacheFile($url)
    {
        if (!$this->cache) {
            throw new \Exception('Unexpected call to getCacheFile -- cache is disabled.');
        }
        $hash = md5($url);
        return $this->cache . '/' . substr($hash, 0, 3) . '/' . substr($hash, 3);
    }
}
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