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\Module;
24 use Friendica\BaseModule;
25 use Friendica\Core\Logger;
26 use Friendica\Core\System;
28 use Friendica\Object\Image;
29 use Friendica\Util\HTTPSignature;
30 use Friendica\Util\Images;
31 use Friendica\Util\Proxy as ProxyUtils;
37 * /proxy/[sub1/[sub2/]]<base64url image url>[.ext][:size]
38 * /proxy?url=<image url>
40 class Proxy extends BaseModule
44 * Fetch remote image content
46 public static function rawContent(array $parameters = [])
48 $request = self::getRequestInfo($parameters);
50 if (!DI::config()->get('system', 'proxify_content')) {
51 Logger::notice('Proxy access is forbidden', ['request' => $request, 'agent' => $_SERVER['HTTP_USER_AGENT'] ?? '', 'accept' => $_SERVER['HTTP_ACCEPT'] ?? '']);
52 throw new \Friendica\Network\HTTPException\NotFoundException();
55 if (isset($_SERVER["HTTP_IF_MODIFIED_SINCE"])) {
56 header("HTTP/1.1 304 Not Modified");
57 header("Last-Modified: " . gmdate("D, d M Y H:i:s", time()) . " GMT");
58 if (!empty($_SERVER["HTTP_IF_NONE_MATCH"])) {
59 header("Etag: " . $_SERVER["HTTP_IF_NONE_MATCH"]);
61 header("Expires: " . gmdate("D, d M Y H:i:s", time() + (31536000)) . " GMT");
62 header("Cache-Control: max-age=31536000");
63 if (function_exists("header_remove")) {
64 header_remove("Last-Modified");
65 header_remove("Expires");
66 header_remove("Cache-Control");
71 if (empty($request['url'])) {
72 throw new \Friendica\Network\HTTPException\BadRequestException();
76 Logger::info('Redirecting not logged in user to original address', ['url' => $request['url']]);
77 System::externalRedirect($request['url']);
80 // It shouldn't happen but it does - spaces in URL
81 $request['url'] = str_replace(' ', '+', $request['url']);
83 // Fetch the content with the local user
84 $fetchResult = HTTPSignature::fetchRaw($request['url'], local_user(), ['accept_content' => [], 'timeout' => 10]);
85 $img_str = $fetchResult->getBody();
87 if (!$fetchResult->isSuccess() || empty($img_str)) {
88 Logger::info('Error fetching image', ['image' => $request['url'], 'return' => $fetchResult->getReturnCode(), 'empty' => empty($img_str)]);
89 self::responseError();
93 $mime = Images::getMimeTypeByData($img_str);
95 $image = new Image($img_str, $mime);
96 if (!$image->isValid()) {
97 Logger::info('The image is invalid', ['image' => $request['url'], 'mime' => $mime]);
98 self::responseError();
102 // reduce quality - if it isn't a GIF
103 if ($image->getType() != 'image/gif') {
104 $image->scaleDown($request['size']);
107 self::responseImageHttpCache($image);
112 * Build info about requested image to be proxied
116 * 'url' => requested url,
117 * 'size' => requested image size (int)
118 * 'sizetype' => requested image size (string): ':micro', ':thumb', ':small', ':medium', ':large'
122 private static function getRequestInfo(array $parameters)
124 $size = ProxyUtils::PIXEL_LARGE;
127 if (!empty($parameters['url']) && empty($_REQUEST['url'])) {
128 $url = $parameters['url'];
130 // thumb, small, medium and large.
131 if (substr($url, -6) == ':micro') {
132 $size = ProxyUtils::PIXEL_MICRO;
133 $sizetype = ':micro';
134 $url = substr($url, 0, -6);
135 } elseif (substr($url, -6) == ':thumb') {
136 $size = ProxyUtils::PIXEL_THUMB;
137 $sizetype = ':thumb';
138 $url = substr($url, 0, -6);
139 } elseif (substr($url, -6) == ':small') {
140 $size = ProxyUtils::PIXEL_SMALL;
141 $url = substr($url, 0, -6);
142 $sizetype = ':small';
143 } elseif (substr($url, -7) == ':medium') {
144 $size = ProxyUtils::PIXEL_MEDIUM;
145 $url = substr($url, 0, -7);
146 $sizetype = ':medium';
147 } elseif (substr($url, -6) == ':large') {
148 $size = ProxyUtils::PIXEL_LARGE;
149 $url = substr($url, 0, -6);
150 $sizetype = ':large';
153 $pos = strrpos($url, '=.');
155 $url = substr($url, 0, $pos + 1);
158 $url = str_replace(['.jpg', '.jpeg', '.gif', '.png'], ['','','',''], $url);
160 $url = base64_decode(strtr($url, '-_', '+/'), true);
162 $url = $_REQUEST['url'] ?? '';
168 'sizetype' => $sizetype,
173 * In case of an error just stop. We don't return content to avoid caching problems
175 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
177 private static function responseError()
179 throw new \Friendica\Network\HTTPException\InternalServerErrorException();
183 * Output the image with cache headers
186 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
188 private static function responseImageHttpCache(Image $img)
190 if (is_null($img) || !$img->isValid()) {
191 Logger::info('The cached image is invalid');
192 self::responseError();
195 header('Content-type: ' . $img->getType());
196 header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
197 header('Etag: "' . md5($img->asString()) . '"');
198 header('Expires: ' . gmdate('D, d M Y H:i:s', time() + (31536000)) . ' GMT');
199 header('Cache-Control: max-age=31536000');
200 echo $img->asString();