376 lines
11 KiB
PHP
376 lines
11 KiB
PHP
<?php
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/**
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* @file mod/proxy.php
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* @brief Based upon "Privacy Image Cache" by Tobias Hößl <https://github.com/CatoTH/>
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*/
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use Friendica\App;
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use Friendica\Core\Config;
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use Friendica\Core\System;
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use Friendica\Database\DBA;
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use Friendica\Model\Photo;
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use Friendica\Object\Image;
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use Friendica\Util\DateTimeFormat;
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use Friendica\Util\Network;
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define('PROXY_DEFAULT_TIME', 86400); // 1 Day
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define('PROXY_SIZE_MICRO', 'micro');
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define('PROXY_SIZE_THUMB', 'thumb');
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define('PROXY_SIZE_SMALL', 'small');
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define('PROXY_SIZE_MEDIUM', 'medium');
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define('PROXY_SIZE_LARGE', 'large');
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require_once 'include/security.php';
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function proxy_init(App $a) {
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// Pictures are stored in one of the following ways:
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// 1. If a folder "proxy" exists and is writeable, then use this for caching
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// 2. If a cache path is defined, use this
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// 3. If everything else failed, cache into the database
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//
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// Question: Do we really need these three methods?
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if (isset($_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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header('Etag: ' . $_SERVER['HTTP_IF_NONE_MATCH']);
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header('Expires: ' . gmdate('D, d M Y H:i:s', time() + (31536000)) . ' GMT');
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header('Cache-Control: max-age=31536000');
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if (function_exists('header_remove')) {
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header_remove('Last-Modified');
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header_remove('Expires');
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header_remove('Cache-Control');
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}
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exit;
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}
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if (function_exists('header_remove')) {
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header_remove('Pragma');
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header_remove('pragma');
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}
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$thumb = false;
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$size = 1024;
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$sizetype = '';
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$basepath = $a->get_basepath();
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// If the cache path isn't there, try to create it
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if (!is_dir($basepath . '/proxy') && is_writable($basepath)) {
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mkdir($basepath . '/proxy');
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}
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// Checking if caching into a folder in the webroot is activated and working
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$direct_cache = (is_dir($basepath . '/proxy') && is_writable($basepath . '/proxy'));
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// Look for filename in the arguments
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if ((isset($a->argv[1]) || isset($a->argv[2]) || isset($a->argv[3])) && !isset($_REQUEST['url'])) {
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if (isset($a->argv[3])) {
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$url = $a->argv[3];
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} elseif (isset($a->argv[2])) {
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$url = $a->argv[2];
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} else {
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$url = $a->argv[1];
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}
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if (isset($a->argv[3]) && ($a->argv[3] == 'thumb')) {
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$size = 200;
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}
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// thumb, small, medium and large.
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if (substr($url, -6) == ':micro') {
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$size = 48;
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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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$size = 80;
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$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 = 175;
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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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$size = 600;
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$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 = 1024;
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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($url, '-_', '+/'), true);
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if ($url) {
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$_REQUEST['url'] = $url;
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}
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} else {
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$direct_cache = false;
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}
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if (!$direct_cache) {
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$urlhash = 'pic:' . sha1($_REQUEST['url']);
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$cachefile = get_cachefile(hash('md5', $_REQUEST['url']));
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if ($cachefile != '' && file_exists($cachefile)) {
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$img_str = file_get_contents($cachefile);
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$mime = image_type_to_mime_type(exif_imagetype($cachefile));
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header('Content-type: ' . $mime);
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header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
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header('Etag: "' . md5($img_str) . '"');
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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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// reduce quality - if it isn't a GIF
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if ($mime != 'image/gif') {
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$Image = new Image($img_str, $mime);
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if ($Image->isValid()) {
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$img_str = $Image->asString();
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}
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}
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echo $img_str;
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killme();
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}
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} else {
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$cachefile = '';
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}
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$valid = true;
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$photo = null;
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if (!$direct_cache && ($cachefile == '')) {
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$photo = DBA::selectFirst('photo', ['data', 'desc'], ['resource-id' => $urlhash]);
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if (DBA::is_result($photo)) {
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$img_str = $photo['data'];
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$mime = $photo['desc'];
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if ($mime == '') {
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$mime = 'image/jpeg';
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}
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}
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}
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if (!DBA::is_result($photo)) {
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// It shouldn't happen but it does - spaces in URL
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$_REQUEST['url'] = str_replace(' ', '+', $_REQUEST['url']);
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$redirects = 0;
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$img_str = Network::fetchUrl($_REQUEST['url'], true, $redirects, 10);
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$tempfile = tempnam(get_temppath(), 'cache');
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file_put_contents($tempfile, $img_str);
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$mime = image_type_to_mime_type(exif_imagetype($tempfile));
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unlink($tempfile);
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// If there is an error then return a blank image
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if ((substr($a->get_curl_code(), 0, 1) == '4') || (!$img_str)) {
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$img_str = file_get_contents('images/blank.png');
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$mime = 'image/png';
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$cachefile = ''; // Clear the cachefile so that the dummy isn't stored
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$valid = false;
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$Image = new Image($img_str, 'image/png');
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if ($Image->isValid()) {
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$Image->scaleDown(10);
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$img_str = $Image->asString();
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}
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} elseif ($mime != 'image/jpeg' && !$direct_cache && $cachefile == '') {
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$image = @imagecreatefromstring($img_str);
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if ($image === FALSE) {
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die();
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}
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$fields = ['uid' => 0, 'contact-id' => 0, 'guid' => System::createGUID(), 'resource-id' => $urlhash, 'created' => DateTimeFormat::utcNow(), 'edited' => DateTimeFormat::utcNow(),
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'filename' => basename($_REQUEST['url']), 'type' => '', 'album' => '', 'height' => imagesy($image), 'width' => imagesx($image),
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'datasize' => 0, 'data' => $img_str, 'scale' => 100, 'profile' => 0,
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'allow_cid' => '', 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => '', 'desc' => $mime];
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DBA::insert('photo', $fields);
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} else {
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$Image = new Image($img_str, $mime);
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if ($Image->isValid() && !$direct_cache && ($cachefile == '')) {
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Photo::store($Image, 0, 0, $urlhash, $_REQUEST['url'], '', 100);
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}
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}
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}
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$img_str_orig = $img_str;
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// reduce quality - if it isn't a GIF
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if ($mime != 'image/gif') {
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$Image = new Image($img_str, $mime);
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if ($Image->isValid()) {
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$Image->scaleDown($size);
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$img_str = $Image->asString();
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}
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}
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// If there is a real existing directory then put the cache file there
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// advantage: real file access is really fast
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// Otherwise write in cachefile
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if ($valid && $direct_cache) {
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file_put_contents($basepath . '/proxy/' . proxy_url($_REQUEST['url'], true), $img_str_orig);
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if ($sizetype != '') {
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file_put_contents($basepath . '/proxy/' . proxy_url($_REQUEST['url'], true) . $sizetype, $img_str);
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}
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} elseif ($cachefile != '') {
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file_put_contents($cachefile, $img_str_orig);
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}
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header('Content-type: ' . $mime);
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// Only output the cache headers when the file is valid
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if ($valid) {
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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_str) . '"');
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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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}
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echo $img_str;
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killme();
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}
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/**
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* @brief Transform a remote URL into a local one
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*
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* This function only performs the URL replacement on http URL and if the
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* provided URL isn't local, "the isn't deactivated" (sic) and if the config
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* system.proxy_disabled is set to false.
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*
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* @param string $url The URL to proxyfy
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* @param bool $writemode Returns a local path the remote URL should be saved to
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* @param string $size One of the PROXY_SIZE_* constants
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*
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* @return string The proxyfied URL or relative path
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*/
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function proxy_url($url, $writemode = false, $size = '') {
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$a = get_app();
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if (substr($url, 0, strlen('http')) !== 'http') {
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return $url;
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}
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// Only continue if it isn't a local image and the isn't deactivated
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if (proxy_is_local_image($url)) {
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$url = str_replace(normalise_link(System::baseUrl()) . '/', System::baseUrl() . '/', $url);
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return $url;
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}
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if (Config::get('system', 'proxy_disabled')) {
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return $url;
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}
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// Image URL may have encoded ampersands for display which aren't desirable for proxy
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$url = html_entity_decode($url, ENT_NOQUOTES, 'utf-8');
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// Creating a sub directory to reduce the amount of files in the cache directory
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$basepath = $a->get_basepath() . '/proxy';
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$shortpath = hash('md5', $url);
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$longpath = substr($shortpath, 0, 2);
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if (is_dir($basepath) && $writemode && !is_dir($basepath . '/' . $longpath)) {
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mkdir($basepath . '/' . $longpath);
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chmod($basepath . '/' . $longpath, 0777);
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}
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$longpath .= '/' . strtr(base64_encode($url), '+/', '-_');
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// Extract the URL extension
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$extension = pathinfo(parse_url($url, PHP_URL_PATH), PATHINFO_EXTENSION);
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$extensions = ['jpg', 'jpeg', 'gif', 'png'];
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if (in_array($extension, $extensions)) {
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$shortpath .= '.' . $extension;
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$longpath .= '.' . $extension;
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}
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$proxypath = System::baseUrl() . '/proxy/' . $longpath;
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if ($size != '') {
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$size = ':' . $size;
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}
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// Too long files aren't supported by Apache
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// Writemode in combination with long files shouldn't be possible
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if ((strlen($proxypath) > 250) && $writemode) {
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return $shortpath;
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} elseif (strlen($proxypath) > 250) {
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return System::baseUrl() . '/proxy/' . $shortpath . '?url=' . urlencode($url);
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} elseif ($writemode) {
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return $longpath;
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} else {
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return $proxypath . $size;
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}
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}
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/**
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* @param $url string
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* @return boolean
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*/
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function proxy_is_local_image($url) {
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if ($url[0] == '/') {
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return true;
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}
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if (strtolower(substr($url, 0, 5)) == 'data:') {
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return true;
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}
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// links normalised - bug #431
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$baseurl = normalise_link(System::baseUrl());
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$url = normalise_link($url);
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return (substr($url, 0, strlen($baseurl)) == $baseurl);
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}
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/**
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* @brief Return the array of query string parameters from a URL
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*
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* @param string $url
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* @return array Associative array of query string parameters
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*/
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function proxy_parse_query($url) {
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$query = parse_url($url, PHP_URL_QUERY);
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$query = html_entity_decode($query);
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$query_list = explode('&', $query);
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$arr = [];
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foreach ($query_list as $key_value) {
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$key_value_list = explode('=', $key_value);
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$arr[$key_value_list[0]] = $key_value_list[1];
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}
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unset($url, $query_list, $url);
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return $arr;
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}
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function proxy_img_cb($matches) {
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// if the picture seems to be from another picture cache then take the original source
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$queryvar = proxy_parse_query($matches[2]);
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if (($queryvar['url'] != '') && (substr($queryvar['url'], 0, 4) == 'http')) {
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$matches[2] = urldecode($queryvar['url']);
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}
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// following line changed per bug #431
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if (proxy_is_local_image($matches[2])) {
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return $matches[1] . $matches[2] . $matches[3];
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}
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return $matches[1] . proxy_url(htmlspecialchars_decode($matches[2])) . $matches[3];
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}
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function proxy_parse_html($html) {
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$html = str_replace(normalise_link(System::baseUrl()) . '/', System::baseUrl() . '/', $html);
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return preg_replace_callback('/(<img [^>]*src *= *["\'])([^"\']+)(["\'][^>]*>)/siU', 'proxy_img_cb', $html);
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}
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