372 lines
11 KiB
PHP
372 lines
11 KiB
PHP
<?php
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// Based upon "Privacy Image Cache" by Tobias Hößl <https://github.com/CatoTH/>
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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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require_once("include/Photo.php");
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function proxy_init() {
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global $a, $_SERVER;
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// Pictures are stored in one of the following ways:
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// 1. If a folder "proxy" exists and is writeable, then use this for caching
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// 2. If a cache path is defined, use this
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// 3. If everything else failed, cache into the database
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//
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// Question: Do we really need these three methods?
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if (isset($_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"))
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if (is_writable($basepath))
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mkdir($basepath."/proxy");
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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") AND is_writable($basepath."/proxy"));
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// Look for filename in the arguments
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if ((isset($a->argv[1]) OR isset($a->argv[2]) OR isset($a->argv[3])) AND !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 = $a->argv[1];
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if (isset($a->argv[3]) and ($a->argv[3] == "thumb"))
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$size = 200;
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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, $pos+1);
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$url = str_replace(array(".jpg", ".jpeg", ".gif", ".png"), array("","","",""), $url);
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$url = base64_decode(strtr($url, '-_', '+/'), true);
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if ($url)
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$_REQUEST['url'] = $url;
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} else
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$direct_cache = false;
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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 != '') {
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if (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 ($mime != "image/gif") {
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$img = new Photo($img_str, $mime);
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if($img->is_valid()) {
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$img_str = $img->imageString();
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}
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}
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echo $img_str;
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killme();
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}
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}
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} else
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$cachefile = "";
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$valid = true;
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if (!$direct_cache AND ($cachefile == "")) {
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$r = qu("SELECT * FROM `photo` WHERE `resource-id` = '%s' LIMIT 1", $urlhash);
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if (count($r)) {
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$img_str = $r[0]['data'];
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$mime = $r[0]["desc"];
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if ($mime == "") $mime = "image/jpeg";
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}
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} else
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$r = array();
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if (!count($r)) {
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// It shouldn't happen but it does - spaces in URL
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$_REQUEST['url'] = str_replace(" ", "+", $_REQUEST['url']);
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$redirects = 0;
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$img_str = fetch_url($_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($a->get_curl_code(), 0, 1) == "4") or (!$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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$img = new Photo($img_str, "image/png");
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if($img->is_valid()) {
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$img->scaleImage(10);
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$img_str = $img->imageString();
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}
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} else if (($mime != "image/jpeg") AND !$direct_cache AND ($cachefile == "")) {
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$image = @imagecreatefromstring($img_str);
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if($image === FALSE) die();
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q("INSERT INTO `photo`
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( `uid`, `contact-id`, `guid`, `resource-id`, `created`, `edited`, `filename`, `album`, `height`, `width`, `desc`, `data`, `scale`, `profile`, `allow_cid`, `allow_gid`, `deny_cid`, `deny_gid` )
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VALUES ( %d, %d, '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, '%s', '%s', %d, %d, '%s', '%s', '%s', '%s' )",
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0, 0, get_guid(), dbesc($urlhash),
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dbesc(datetime_convert()),
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dbesc(datetime_convert()),
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dbesc(basename(dbesc($_REQUEST["url"]))),
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dbesc(''),
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intval(imagesy($image)),
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intval(imagesx($image)),
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$mime,
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dbesc($img_str),
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100,
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intval(0),
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dbesc(''), dbesc(''), dbesc(''), dbesc('')
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);
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} else {
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$img = new Photo($img_str, $mime);
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if($img->is_valid()) {
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if (!$direct_cache AND ($cachefile == ""))
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$img->store(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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$img = new Photo($img_str, $mime);
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if($img->is_valid()) {
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$img->scaleImage($size);
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$img_str = $img->imageString();
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}
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}
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// If there is a real existing directory then put the cache file there
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// advantage: real file access is really fast
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// Otherwise write in cachefile
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if ($valid AND $direct_cache) {
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file_put_contents($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, $img_str);
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} elseif ($cachefile != '')
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file_put_contents($cachefile, $img_str_orig);
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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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$url = str_replace(normalise_link($a->get_baseurl()) . '/', $a->get_baseurl() . '/', $url);
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return $url;
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}
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if (get_config('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) and $writemode) {
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if (!is_dir($basepath . '/' . $longpath)) {
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mkdir($basepath . '/' . $longpath);
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chmod($basepath . '/' . $longpath, 0777);
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}
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}
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$longpath .= '/' . strtr(base64_encode($url), '+/', '-_');
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// Checking for valid extensions. Only add them if they are safe
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$pos = strrpos($url, '.');
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if ($pos) {
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$extension = strtolower(substr($url, $pos + 1));
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$pos = strpos($extension, '?');
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if ($pos) {
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$extension = substr($extension, 0, $pos);
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}
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}
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$extensions = array('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 = $a->get_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) AND $writemode) {
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return $shortpath;
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} elseif (strlen($proxypath) > 250) {
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return $a->get_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 ($url[0] == '/') return true;
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if (strtolower(substr($url, 0, 5)) == "data:") return true;
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// links normalised - bug #431
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$baseurl = normalise_link(get_app()->get_baseurl());
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$url = normalise_link($url);
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return (substr($url, 0, strlen($baseurl)) == $baseurl);
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}
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function proxy_parse_query($var) {
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/**
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* Use this function to parse out the query array element from
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* the output of parse_url().
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*/
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$var = parse_url($var, PHP_URL_QUERY);
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$var = html_entity_decode($var);
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$var = explode('&', $var);
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$arr = array();
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foreach($var as $val) {
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$x = explode('=', $val);
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$arr[$x[0]] = $x[1];
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}
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unset($val, $x, $var);
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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 (($queryvar['url'] != "") AND (substr($queryvar['url'], 0, 4) == "http"))
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$matches[2] = urldecode($queryvar['url']);
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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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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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$a = get_app();
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$html = str_replace(normalise_link($a->get_baseurl())."/", $a->get_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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