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1 | <?php |
2 | |
3 | /** |
4 | * Caching Proxy for Cover Images |
5 | * |
6 | * PHP version 8 |
7 | * |
8 | * Copyright (C) Villanova University 2015. |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License version 2, |
12 | * as published by the Free Software Foundation. |
13 | * |
14 | * This program is distributed in the hope that it will be useful, |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
17 | * GNU General Public License for more details. |
18 | * |
19 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
22 | * |
23 | * @category VuFind |
24 | * @package Cover_Generator |
25 | * @author Demian Katz <demian.katz@villanova.edu> |
26 | * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License |
27 | * @link https://vufind.org/wiki/configuration:external_content Wiki |
28 | */ |
29 | |
30 | namespace VuFind\Cover; |
31 | |
32 | use Laminas\Http\Client; |
33 | use Laminas\Http\Response; |
34 | |
35 | use function dirname; |
36 | |
37 | /** |
38 | * Caching Proxy for Cover Images |
39 | * |
40 | * @category VuFind |
41 | * @package Cover_Generator |
42 | * @author Demian Katz <demian.katz@villanova.edu> |
43 | * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License |
44 | * @link https://vufind.org/wiki/configuration:external_content Wiki |
45 | */ |
46 | class CachingProxy |
47 | { |
48 | /** |
49 | * HTTP client |
50 | * |
51 | * @var Client |
52 | */ |
53 | protected $client; |
54 | |
55 | /** |
56 | * Base directory for cache |
57 | * |
58 | * @var string |
59 | */ |
60 | protected $cache; |
61 | |
62 | /** |
63 | * Array of regular expressions for hosts to cache |
64 | * |
65 | * @var array |
66 | */ |
67 | protected $allowedHosts; |
68 | |
69 | /** |
70 | * Constructor |
71 | * |
72 | * @param Client $client HTTP client |
73 | * @param ?string $cache Base directory for cache (null to disable caching) |
74 | * @param array $allowedHosts Array of regular expressions for hosts to cache |
75 | */ |
76 | public function __construct(Client $client, $cache, array $allowedHosts = []) |
77 | { |
78 | $this->client = $client; |
79 | $this->cache = $cache; |
80 | $this->allowedHosts = $allowedHosts; |
81 | } |
82 | |
83 | /** |
84 | * Fetch an image from either a URL or the cache (as appropriate). |
85 | * |
86 | * @param string $url URL to fetch |
87 | * |
88 | * @return Response |
89 | */ |
90 | public function fetch($url) |
91 | { |
92 | $file = $this->getCacheFile($url); |
93 | $cacheAllowed = $this->cache && $this->hasLegalHost($url); |
94 | if (!$cacheAllowed || !($response = $this->fetchCache($file))) { |
95 | $response = $this->client->setUri($url)->send(); |
96 | if ($cacheAllowed) { |
97 | $this->setCache($file, $response); |
98 | } |
99 | } |
100 | return $response; |
101 | } |
102 | |
103 | /** |
104 | * Load a response from cache (or return false if cache is missing). |
105 | * |
106 | * @param string $file Cache file to load |
107 | * |
108 | * @return bool|Response |
109 | */ |
110 | protected function fetchCache($file) |
111 | { |
112 | return file_exists($file) |
113 | ? unserialize(file_get_contents($file)) |
114 | : false; |
115 | } |
116 | |
117 | /** |
118 | * Save a response to the cache. |
119 | * |
120 | * @param string $file Filename to update |
121 | * @param Response $response Response to write |
122 | * |
123 | * @return void |
124 | */ |
125 | protected function setCache($file, Response $response) |
126 | { |
127 | if (!$this->cache) { |
128 | return; // don't write if cache is disabled |
129 | } |
130 | if (!file_exists($this->cache)) { |
131 | mkdir($this->cache); |
132 | } |
133 | if (!file_exists(dirname($file))) { |
134 | mkdir(dirname($file)); |
135 | } |
136 | file_put_contents($file, serialize($response)); |
137 | } |
138 | |
139 | /** |
140 | * Check if the URL is on the configured list for caching. |
141 | * |
142 | * @param string $url URL to check |
143 | * |
144 | * @return bool |
145 | */ |
146 | protected function hasLegalHost($url) |
147 | { |
148 | $host = parse_url($url, PHP_URL_HOST); |
149 | foreach ($this->allowedHosts as $current) { |
150 | if (preg_match($current, $host)) { |
151 | return true; |
152 | } |
153 | } |
154 | return false; |
155 | } |
156 | |
157 | /** |
158 | * Get the cache filename corresponding with the provided URL. |
159 | * |
160 | * @param string $url URL |
161 | * |
162 | * @return string |
163 | * @throws \Exception |
164 | */ |
165 | protected function getCacheFile($url) |
166 | { |
167 | if (!$this->cache) { |
168 | throw new \Exception('Unexpected call to getCacheFile -- cache is disabled.'); |
169 | } |
170 | $hash = md5($url); |
171 | return $this->cache . '/' . substr($hash, 0, 3) . '/' . substr($hash, 3); |
172 | } |
173 | } |