<?php /** * @file mod/proxy.php * @brief Based upon "Privacy Image Cache" by Tobias Hößl <https://github.com/CatoTH/> */ use Friendica\App; use Friendica\Core\Config; use Friendica\Core\System; use Friendica\Database\DBM; use Friendica\Model\Photo; use Friendica\Object\Image; use Friendica\Util\Network; define('PROXY_DEFAULT_TIME', 86400); // 1 Day define('PROXY_SIZE_MICRO', 'micro'); define('PROXY_SIZE_THUMB', 'thumb'); define('PROXY_SIZE_SMALL', 'small'); define('PROXY_SIZE_MEDIUM', 'medium'); define('PROXY_SIZE_LARGE', 'large'); require_once 'include/security.php'; function proxy_init(App $a) { // Pictures are stored in one of the following ways: // 1. If a folder "proxy" exists and is writeable, then use this for caching // 2. If a cache path is defined, use this // 3. If everything else failed, cache into the database // // Question: Do we really need these three methods? if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) { header('HTTP/1.1 304 Not Modified'); header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT'); header('Etag: ' . $_SERVER['HTTP_IF_NONE_MATCH']); header('Expires: ' . gmdate('D, d M Y H:i:s', time() + (31536000)) . ' GMT'); header('Cache-Control: max-age=31536000'); if (function_exists('header_remove')) { header_remove('Last-Modified'); header_remove('Expires'); header_remove('Cache-Control'); } exit; } if (function_exists('header_remove')) { header_remove('Pragma'); header_remove('pragma'); } $thumb = false; $size = 1024; $sizetype = ''; $basepath = $a->get_basepath(); // If the cache path isn't there, try to create it if (!is_dir($basepath . '/proxy') && is_writable($basepath)) { mkdir($basepath . '/proxy'); } // Checking if caching into a folder in the webroot is activated and working $direct_cache = (is_dir($basepath . '/proxy') && is_writable($basepath . '/proxy')); // Look for filename in the arguments if ((isset($a->argv[1]) || isset($a->argv[2]) || isset($a->argv[3])) && !isset($_REQUEST['url'])) { if (isset($a->argv[3])) { $url = $a->argv[3]; } elseif (isset($a->argv[2])) { $url = $a->argv[2]; } else { $url = $a->argv[1]; } if (isset($a->argv[3]) && ($a->argv[3] == 'thumb')) { $size = 200; } // thumb, small, medium and large. if (substr($url, -6) == ':micro') { $size = 48; $sizetype = ':micro'; $url = substr($url, 0, -6); } elseif (substr($url, -6) == ':thumb') { $size = 80; $sizetype = ':thumb'; $url = substr($url, 0, -6); } elseif (substr($url, -6) == ':small') { $size = 175; $url = substr($url, 0, -6); $sizetype = ':small'; } elseif (substr($url, -7) == ':medium') { $size = 600; $url = substr($url, 0, -7); $sizetype = ':medium'; } elseif (substr($url, -6) == ':large') { $size = 1024; $url = substr($url, 0, -6); $sizetype = ':large'; } $pos = strrpos($url, '=.'); if ($pos) { $url = substr($url, 0, $pos + 1); } $url = str_replace(['.jpg', '.jpeg', '.gif', '.png'], ['','','',''], $url); $url = base64_decode(strtr($url, '-_', '+/'), true); if ($url) { $_REQUEST['url'] = $url; } } else { $direct_cache = false; } if (!$direct_cache) { $urlhash = 'pic:' . sha1($_REQUEST['url']); $cachefile = get_cachefile(hash('md5', $_REQUEST['url'])); if ($cachefile != '' && file_exists($cachefile)) { $img_str = file_get_contents($cachefile); $mime = image_type_to_mime_type(exif_imagetype($cachefile)); header('Content-type: ' . $mime); header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT'); header('Etag: "' . md5($img_str) . '"'); header('Expires: ' . gmdate('D, d M Y H:i:s', time() + (31536000)) . ' GMT'); header('Cache-Control: max-age=31536000'); // reduce quality - if it isn't a GIF if ($mime != 'image/gif') { $Image = new Image($img_str, $mime); if ($Image->isValid()) { $img_str = $Image->asString(); } } echo $img_str; killme(); } } else { $cachefile = ''; } $valid = true; $photo = null; if (!$direct_cache && ($cachefile == '')) { $photo = dba::selectFirst('photo', ['data', 'desc'], ['resource-id' => $urlhash]); if (DBM::is_result($photo)) { $img_str = $photo['data']; $mime = $photo['desc']; if ($mime == '') { $mime = 'image/jpeg'; } } } if (!DBM::is_result($photo)) { // It shouldn't happen but it does - spaces in URL $_REQUEST['url'] = str_replace(' ', '+', $_REQUEST['url']); $redirects = 0; $img_str = Network::fetchUrl($_REQUEST['url'], true, $redirects, 10); $tempfile = tempnam(get_temppath(), 'cache'); file_put_contents($tempfile, $img_str); $mime = image_type_to_mime_type(exif_imagetype($tempfile)); unlink($tempfile); // If there is an error then return a blank image if ((substr($a->get_curl_code(), 0, 1) == '4') || (!$img_str)) { $img_str = file_get_contents('images/blank.png'); $mime = 'image/png'; $cachefile = ''; // Clear the cachefile so that the dummy isn't stored $valid = false; $Image = new Image($img_str, 'image/png'); if ($Image->isValid()) { $Image->scaleDown(10); $img_str = $Image->asString(); } } elseif ($mime != 'image/jpeg' && !$direct_cache && $cachefile == '') { $image = @imagecreatefromstring($img_str); if ($image === FALSE) { die(); } $fields = ['uid' => 0, 'contact-id' => 0, 'guid' => get_guid(), 'resource-id' => $urlhash, 'created' => datetime_convert(), 'edited' => datetime_convert(), 'filename' => basename($_REQUEST['url']), 'type' => '', 'album' => '', 'height' => imagesy($image), 'width' => imagesx($image), 'datasize' => 0, 'data' => $img_str, 'scale' => 100, 'profile' => 0, 'allow_cid' => '', 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => '', 'desc' => $mime]; dba::insert('photo', $fields); } else { $Image = new Image($img_str, $mime); if ($Image->isValid() && !$direct_cache && ($cachefile == '')) { Photo::store($Image, 0, 0, $urlhash, $_REQUEST['url'], '', 100); } } } $img_str_orig = $img_str; // reduce quality - if it isn't a GIF if ($mime != 'image/gif') { $Image = new Image($img_str, $mime); if ($Image->isValid()) { $Image->scaleDown($size); $img_str = $Image->asString(); } } // If there is a real existing directory then put the cache file there // advantage: real file access is really fast // Otherwise write in cachefile if ($valid && $direct_cache) { file_put_contents($basepath . '/proxy/' . proxy_url($_REQUEST['url'], true), $img_str_orig); if ($sizetype != '') { file_put_contents($basepath . '/proxy/' . proxy_url($_REQUEST['url'], true) . $sizetype, $img_str); } } elseif ($cachefile != '') { file_put_contents($cachefile, $img_str_orig); } header('Content-type: ' . $mime); // Only output the cache headers when the file is valid if ($valid) { header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT'); header('Etag: "' . md5($img_str) . '"'); header('Expires: ' . gmdate('D, d M Y H:i:s', time() + (31536000)) . ' GMT'); header('Cache-Control: max-age=31536000'); } echo $img_str; killme(); } /** * @brief Transform a remote URL into a local one * * This function only performs the URL replacement on http URL and if the * provided URL isn't local, "the isn't deactivated" (sic) and if the config * system.proxy_disabled is set to false. * * @param string $url The URL to proxyfy * @param bool $writemode Returns a local path the remote URL should be saved to * @param string $size One of the PROXY_SIZE_* constants * * @return string The proxyfied URL or relative path */ function proxy_url($url, $writemode = false, $size = '') { $a = get_app(); if (substr($url, 0, strlen('http')) !== 'http') { return $url; } // Only continue if it isn't a local image and the isn't deactivated if (proxy_is_local_image($url)) { $url = str_replace(normalise_link(System::baseUrl()) . '/', System::baseUrl() . '/', $url); return $url; } if (Config::get('system', 'proxy_disabled')) { return $url; } // Image URL may have encoded ampersands for display which aren't desirable for proxy $url = html_entity_decode($url, ENT_NOQUOTES, 'utf-8'); // Creating a sub directory to reduce the amount of files in the cache directory $basepath = $a->get_basepath() . '/proxy'; $shortpath = hash('md5', $url); $longpath = substr($shortpath, 0, 2); if (is_dir($basepath) && $writemode && !is_dir($basepath . '/' . $longpath)) { mkdir($basepath . '/' . $longpath); chmod($basepath . '/' . $longpath, 0777); } $longpath .= '/' . strtr(base64_encode($url), '+/', '-_'); // Extract the URL extension $extension = pathinfo(parse_url($url, PHP_URL_PATH), PATHINFO_EXTENSION); $extensions = ['jpg', 'jpeg', 'gif', 'png']; if (in_array($extension, $extensions)) { $shortpath .= '.' . $extension; $longpath .= '.' . $extension; } $proxypath = System::baseUrl() . '/proxy/' . $longpath; if ($size != '') { $size = ':' . $size; } // Too long files aren't supported by Apache // Writemode in combination with long files shouldn't be possible if ((strlen($proxypath) > 250) && $writemode) { return $shortpath; } elseif (strlen($proxypath) > 250) { return System::baseUrl() . '/proxy/' . $shortpath . '?url=' . urlencode($url); } elseif ($writemode) { return $longpath; } else { return $proxypath . $size; } } /** * @param $url string * @return boolean */ function proxy_is_local_image($url) { if ($url[0] == '/') { return true; } if (strtolower(substr($url, 0, 5)) == 'data:') { return true; } // links normalised - bug #431 $baseurl = normalise_link(System::baseUrl()); $url = normalise_link($url); return (substr($url, 0, strlen($baseurl)) == $baseurl); } /** * @brief Return the array of query string parameters from a URL * * @param string $url * @return array Associative array of query string parameters */ function proxy_parse_query($url) { $query = parse_url($url, PHP_URL_QUERY); $query = html_entity_decode($query); $query_list = explode('&', $query); $arr = []; foreach ($query_list as $key_value) { $key_value_list = explode('=', $key_value); $arr[$key_value_list[0]] = $key_value_list[1]; } unset($url, $query_list, $url); return $arr; } function proxy_img_cb($matches) { // if the picture seems to be from another picture cache then take the original source $queryvar = proxy_parse_query($matches[2]); if (($queryvar['url'] != '') && (substr($queryvar['url'], 0, 4) == 'http')) { $matches[2] = urldecode($queryvar['url']); } // following line changed per bug #431 if (proxy_is_local_image($matches[2])) { return $matches[1] . $matches[2] . $matches[3]; } return $matches[1] . proxy_url(htmlspecialchars_decode($matches[2])) . $matches[3]; } function proxy_parse_html($html) { $html = str_replace(normalise_link(System::baseUrl()) . '/', System::baseUrl() . '/', $html); return preg_replace_callback('/(<img [^>]*src *= *["\'])([^"\']+)(["\'][^>]*>)/siU', 'proxy_img_cb', $html); }