friendica/src/Module/Proxy.php

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<?php
/**
* @file src/Module/Proxy.php
* @brief Based upon "Privacy Image Cache" by Tobias Hößl <https://github.com/CatoTH/>
*/
namespace Friendica\Module;
use Friendica\App;
use Friendica\BaseModule;
use Friendica\Core\Config;
use Friendica\Core\System;
use Friendica\Database\DBA;
use Friendica\Model\Photo;
use Friendica\Object\Image;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\Network;
use Friendica\Util\Proxy as ProxyUtils;
require_once 'include/security.php';
/**
* @brief Module Proxy
*/
class Proxy extends BaseModule
{
/**
* @brief Initializer method for this class.
*
* Sets application instance and checks if /proxy/ path is writable.
*
* @param \Friendica\App $app Application instance
*/
public static function init()
{
// Set application instance here
$a = self::getApp();
/*
* Pictures are stored in one of the following ways:
*
* 1. If a folder "proxy" exists and is writeable, then use this for caching
* 2. If a cache path is defined, use this
* 3. If everything else failed, cache into the database
*
* Question: Do we really need these three methods?
*/
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && isset($_SERVER['HTTP_IF_NONE_MATCH'])) {
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');
}
/// @TODO Stop here?
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 {
$direct_cache = false;
}
if (empty($_REQUEST['url'])) {
System::httpExit(400, ["title" => L10n::t('Bad Request.')]);
}
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);
$mime = mime_content_type($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;
exit();
}
} else {
$cachefile = '';
}
$valid = true;
$photo = null;
if (!$direct_cache && ($cachefile == '')) {
$photo = DBA::selectFirst('photo', ['data', 'desc'], ['resource-id' => $urlhash]);
if (DBA::isResult($photo)) {
$img_str = $photo['data'];
$mime = $photo['desc'];
if ($mime == '') {
$mime = 'image/jpeg';
}
}
}
if (!DBA::isResult($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);
$mime = mime_content_type($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' => System::createGUID(), 'resource-id' => $urlhash, 'created' => DateTimeFormat::utcNow(), 'edited' => DateTimeFormat::utcNow(),
'filename' => basename($_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/' . ProxyUtils::proxifyUrl($_REQUEST['url'], true), $img_str_orig);
if ($sizetype != '') {
file_put_contents($basepath . '/proxy/' . ProxyUtils::proxifyUrl($_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;
exit();
}
}