3 * @copyright Copyright (C) 2010-2021, the Friendica project
5 * @license GNU AGPL version 3 or any later version
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU Affero General Public License as
9 * published by the Free Software Foundation, either version 3 of the
10 * License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Affero General Public License for more details.
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <https://www.gnu.org/licenses/>.
22 namespace Friendica\Util;
27 * Proxy utilities class
33 * Default time to keep images in proxy storage
35 const DEFAULT_TIME = 86400; // 1 Day
40 const SIZE_MICRO = 'micro'; // 48
41 const SIZE_THUMB = 'thumb'; // 80
42 const SIZE_SMALL = 'small'; // 300
43 const SIZE_MEDIUM = 'medium'; // 600
44 const SIZE_LARGE = 'large'; // 1024
49 const PIXEL_MICRO = 48;
50 const PIXEL_THUMB = 80;
51 const PIXEL_SMALL = 300;
52 const PIXEL_MEDIUM = 600;
53 const PIXEL_LARGE = 1024;
59 * @todo Make this configurable?
61 private static $extensions = [
71 private function __construct () {
72 // No instances from utilities classes
76 * Transform a remote URL into a local one.
78 * This function only performs the URL replacement on http URL and if the
79 * provided URL isn't local, "the isn't deactivated" (sic) and if the config
80 * system.proxy_disabled is set to false.
82 * @param string $url The URL to proxyfy
83 * @param string $size One of the ProxyUtils::SIZE_* constants
85 * @return string The proxyfied URL or relative path
86 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
88 public static function proxifyUrl($url, $size = '')
90 // Get application instance
96 // Is no http in front of it?
97 /// @TODO To weak test for being a valid URL
98 if (substr($url, 0, 4) !== 'http') {
102 // Only continue if it isn't a local image and the isn't deactivated
103 if (self::isLocalImage($url)) {
104 $url = str_replace(Strings::normaliseLink(DI::baseUrl()) . '/', DI::baseUrl() . '/', $url);
108 // Is the proxy disabled?
109 if (DI::config()->get('system', 'proxy_disabled')) {
113 // Image URL may have encoded ampersands for display which aren't desirable for proxy
114 $url = html_entity_decode($url, ENT_NOQUOTES, 'utf-8');
116 $shortpath = hash('md5', $url);
117 $longpath = substr($shortpath, 0, 2);
119 $longpath .= '/' . strtr(base64_encode($url), '+/', '-_');
121 // Extract the URL extension
122 $extension = pathinfo(parse_url($url, PHP_URL_PATH), PATHINFO_EXTENSION);
124 if (in_array($extension, self::$extensions)) {
125 $shortpath .= '.' . $extension;
126 $longpath .= '.' . $extension;
129 $proxypath = DI::baseUrl() . '/proxy/' . $longpath;
135 // Too long files aren't supported by Apache
136 if (strlen($proxypath) > 250) {
137 return DI::baseUrl() . '/proxy/' . $shortpath . '?url=' . urlencode($url);
139 return $proxypath . $size;
144 * "Proxifies" HTML code's image tags
146 * "Proxifies", means replaces image URLs in given HTML code with those from
147 * proxy storage directory.
149 * @param string $html Un-proxified HTML code
151 * @return string Proxified HTML code
152 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
154 public static function proxifyHtml($html)
156 $html = str_replace(Strings::normaliseLink(DI::baseUrl()) . '/', DI::baseUrl() . '/', $html);
158 return preg_replace_callback('/(<img [^>]*src *= *["\'])([^"\']+)(["\'][^>]*>)/siU', 'self::replaceUrl', $html);
162 * Checks if the URL is a local URL.
166 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
168 public static function isLocalImage($url)
170 if (substr($url, 0, 1) == '/') {
174 if (strtolower(substr($url, 0, 5)) == 'data:') {
178 // links normalised - bug #431
179 $baseurl = Strings::normaliseLink(DI::baseUrl());
180 $url = Strings::normaliseLink($url);
182 return (substr($url, 0, strlen($baseurl)) == $baseurl);
186 * Return the array of query string parameters from a URL
188 * @param string $url URL to parse
189 * @return array Associative array of query string parameters
191 private static function parseQuery($url)
193 $query = parse_url($url, PHP_URL_QUERY);
194 $query = html_entity_decode($query);
196 parse_str($query, $arr);
202 * Call-back method to replace the UR
204 * @param array $matches Matches from preg_replace_callback()
205 * @return string Proxified HTML image tag
206 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
208 private static function replaceUrl(array $matches)
210 // if the picture seems to be from another picture cache then take the original source
211 $queryvar = self::parseQuery($matches[2]);
213 if (!empty($queryvar['url']) && substr($queryvar['url'], 0, 4) == 'http') {
214 $matches[2] = urldecode($queryvar['url']);
217 // Following line changed per bug #431
218 if (self::isLocalImage($matches[2])) {
219 return $matches[1] . $matches[2] . $matches[3];
222 // Return proxified HTML
223 return $matches[1] . self::proxifyUrl(htmlspecialchars_decode($matches[2])) . $matches[3];