mirror of
https://github.com/friendica/friendica
synced 2024-12-25 13:20:16 +00:00
203 lines
5.9 KiB
PHP
203 lines
5.9 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2010-2021, the Friendica project
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Module;
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use Friendica\BaseModule;
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use Friendica\Core\Logger;
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use Friendica\Core\System;
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use Friendica\DI;
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use Friendica\Object\Image;
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use Friendica\Util\HTTPSignature;
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use Friendica\Util\Images;
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use Friendica\Util\Proxy as ProxyUtils;
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/**
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* Module Proxy
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*
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* urls:
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* /proxy/[sub1/[sub2/]]<base64url image url>[.ext][:size]
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* /proxy?url=<image url>
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*/
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class Proxy extends BaseModule
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{
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/**
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* Fetch remote image content
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*/
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public static function rawContent(array $parameters = [])
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{
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$request = self::getRequestInfo($parameters);
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if (!DI::config()->get('system', 'proxify_content')) {
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Logger::notice('Proxy access is forbidden', ['request' => $request, 'agent' => $_SERVER['HTTP_USER_AGENT'] ?? '', 'accept' => $_SERVER['HTTP_ACCEPT'] ?? '']);
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throw new \Friendica\Network\HTTPException\NotFoundException();
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}
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if (isset($_SERVER["HTTP_IF_MODIFIED_SINCE"])) {
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header("HTTP/1.1 304 Not Modified");
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header("Last-Modified: " . gmdate("D, d M Y H:i:s", time()) . " GMT");
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if (!empty($_SERVER["HTTP_IF_NONE_MATCH"])) {
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header("Etag: " . $_SERVER["HTTP_IF_NONE_MATCH"]);
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}
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header("Expires: " . gmdate("D, d M Y H:i:s", time() + (31536000)) . " GMT");
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header("Cache-Control: max-age=31536000");
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if (function_exists("header_remove")) {
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header_remove("Last-Modified");
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header_remove("Expires");
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header_remove("Cache-Control");
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}
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exit;
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}
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if (empty($request['url'])) {
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throw new \Friendica\Network\HTTPException\BadRequestException();
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}
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if (!local_user()) {
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Logger::info('Redirecting not logged in user to original address', ['url' => $request['url']]);
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System::externalRedirect($request['url']);
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}
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// It shouldn't happen but it does - spaces in URL
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$request['url'] = str_replace(' ', '+', $request['url']);
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// Fetch the content with the local user
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$fetchResult = HTTPSignature::fetchRaw($request['url'], local_user(), ['accept_content' => [], 'timeout' => 10]);
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$img_str = $fetchResult->getBody();
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if (!$fetchResult->isSuccess() || empty($img_str)) {
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Logger::info('Error fetching image', ['image' => $request['url'], 'return' => $fetchResult->getReturnCode(), 'empty' => empty($img_str)]);
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self::responseError();
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// stop.
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}
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$mime = Images::getMimeTypeByData($img_str);
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$image = new Image($img_str, $mime);
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if (!$image->isValid()) {
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Logger::info('The image is invalid', ['image' => $request['url'], 'mime' => $mime]);
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self::responseError();
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// stop.
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}
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// reduce quality - if it isn't a GIF
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if ($image->getType() != 'image/gif') {
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$image->scaleDown($request['size']);
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}
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self::responseImageHttpCache($image);
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// stop.
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}
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/**
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* Build info about requested image to be proxied
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*
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* @return array
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* [
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* 'url' => requested url,
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* 'size' => requested image size (int)
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* 'sizetype' => requested image size (string): ':micro', ':thumb', ':small', ':medium', ':large'
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* ]
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* @throws \Exception
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*/
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private static function getRequestInfo(array $parameters)
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{
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$size = ProxyUtils::PIXEL_LARGE;
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$sizetype = '';
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if (!empty($parameters['url']) && empty($_REQUEST['url'])) {
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$url = $parameters['url'];
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// thumb, small, medium and large.
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if (substr($url, -6) == ':micro') {
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$size = ProxyUtils::PIXEL_MICRO;
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$sizetype = ':micro';
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$url = substr($url, 0, -6);
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} elseif (substr($url, -6) == ':thumb') {
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$size = ProxyUtils::PIXEL_THUMB;
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$sizetype = ':thumb';
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$url = substr($url, 0, -6);
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} elseif (substr($url, -6) == ':small') {
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$size = ProxyUtils::PIXEL_SMALL;
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$url = substr($url, 0, -6);
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$sizetype = ':small';
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} elseif (substr($url, -7) == ':medium') {
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$size = ProxyUtils::PIXEL_MEDIUM;
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$url = substr($url, 0, -7);
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$sizetype = ':medium';
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} elseif (substr($url, -6) == ':large') {
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$size = ProxyUtils::PIXEL_LARGE;
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$url = substr($url, 0, -6);
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$sizetype = ':large';
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}
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$pos = strrpos($url, '=.');
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if ($pos) {
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$url = substr($url, 0, $pos + 1);
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}
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$url = str_replace(['.jpg', '.jpeg', '.gif', '.png'], ['','','',''], $url);
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$url = base64_decode(strtr($url, '-_', '+/'), true);
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} else {
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$url = $_REQUEST['url'] ?? '';
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}
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return [
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'url' => $url,
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'size' => $size,
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'sizetype' => $sizetype,
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];
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}
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/**
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* In case of an error just stop. We don't return content to avoid caching problems
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*
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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private static function responseError()
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{
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throw new \Friendica\Network\HTTPException\InternalServerErrorException();
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}
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/**
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* Output the image with cache headers
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*
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* @param Image $img
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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private static function responseImageHttpCache(Image $img)
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{
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if (is_null($img) || !$img->isValid()) {
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Logger::info('The cached image is invalid');
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self::responseError();
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// stop.
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}
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header('Content-type: ' . $img->getType());
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header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
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header('Etag: "' . md5($img->asString()) . '"');
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header('Expires: ' . gmdate('D, d M Y H:i:s', time() + (31536000)) . ' GMT');
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header('Cache-Control: max-age=31536000');
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echo $img->asString();
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exit();
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}
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}
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