<?php // Based upon "Privacy Image Cache" by Tobias Hößl <https://github.com/CatoTH/> define("PROXY_DEFAULT_TIME", 86400); // 1 Day require_once('include/security.php'); require_once("include/Photo.php"); function proxy_init() { global $a, $_SERVER; // Pictures are stored in one of the following ways: // 1. If a folder "proxy" exists and is writeable, then use this for caching // 2. If a cache path is defined, use this // 3. If everything else failed, cache into the database // // Question: Do we really need these three methods? if (isset($_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; $size = 1024; // If the cache path isn't there, try to create it if (!is_dir($_SERVER["DOCUMENT_ROOT"]."/proxy")) if (is_writable($_SERVER["DOCUMENT_ROOT"])) mkdir($_SERVER["DOCUMENT_ROOT"]."/proxy"); // Checking if caching into a folder in the webroot is activated and working $direct_cache = (is_dir($_SERVER["DOCUMENT_ROOT"]."/proxy") AND is_writable($_SERVER["DOCUMENT_ROOT"]."/proxy")); // Look for filename in the arguments if (isset($a->argv[1]) OR isset($a->argv[2]) OR isset($a->argv[3])) { 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]) and ($a->argv[3] == "thumb")) $size = 200; // thumb, small, medium and large. if (substr($url, -6) == ":thumb") $size = 150; if (substr($url, -6) == ":small") $size = 340; if (substr($url, -7) == ":medium") $size = 600; if (substr($url, -6) == ":large") $size = 1024; $pos = strrpos($url, "=."); if ($pos) $url = substr($url, 0, $pos+1); $url = str_replace(array(".jpg", ".jpeg", ".gif", ".png"), array("","","",""), $url); $url = base64_decode(strtr($url, '-_', '+/'), true); if ($url) $_REQUEST['url'] = $url; } if (!$direct_cache) { $urlhash = 'pic:' . sha1($_REQUEST['url']); $cachefile = get_cachefile(hash("md5", $_REQUEST['url'])); if ($cachefile != '') { if (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") { $img = new Photo($img_str, $mime); if($img->is_valid()) { $img_str = $img->imageString(); } } echo $img_str; killme(); } } } else $cachefile = ""; $valid = true; if (!$direct_cache AND ($cachefile == "")) { $r = q("SELECT * FROM `photo` WHERE `resource-id` = '%s' LIMIT 1", $urlhash); if (count($r)) { $img_str = $r[0]['data']; $mime = $r[0]["desc"]; if ($mime == "") $mime = "image/jpeg"; } } else $r = array(); if (!count($r)) { // It shouldn't happen but it does - spaces in URL $_REQUEST['url'] = str_replace(" ", "+", $_REQUEST['url']); $redirects = 0; $img_str = fetch_url($_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") or (!$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; $img = new Photo($img_str, "image/png"); if($img->is_valid()) { $img->scaleImage(10); $img_str = $img->imageString(); } } else if (($mime != "image/jpeg") AND !$direct_cache AND ($cachefile == "")) { $image = @imagecreatefromstring($img_str); if($image === FALSE) die(); q("INSERT INTO `photo` ( `uid`, `contact-id`, `guid`, `resource-id`, `created`, `edited`, `filename`, `album`, `height`, `width`, `desc`, `data`, `scale`, `profile`, `allow_cid`, `allow_gid`, `deny_cid`, `deny_gid` ) VALUES ( %d, %d, '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, '%s', '%s', %d, %d, '%s', '%s', '%s', '%s' )", 0, 0, get_guid(), dbesc($urlhash), dbesc(datetime_convert()), dbesc(datetime_convert()), dbesc(basename(dbesc($_REQUEST["url"]))), dbesc(''), intval(imagesy($image)), intval(imagesx($image)), $mime, dbesc($img_str), 100, intval(0), dbesc(''), dbesc(''), dbesc(''), dbesc('') ); } else { $img = new Photo($img_str, $mime); if($img->is_valid()) { if (!$direct_cache AND ($cachefile == "")) $img->store(0, 0, $urlhash, $_REQUEST['url'], '', 100); } } } // reduce quality - if it isn't a GIF if ($mime != "image/gif") { $img = new Photo($img_str, $mime); if($img->is_valid()) { $img->scaleImage($size); $img_str = $img->imageString(); } } // If there is a real existing directory then put the cache file there // advantage: real file access is really fast // Otherwise write in cachefile if ($valid AND $direct_cache) file_put_contents($_SERVER["DOCUMENT_ROOT"]."/proxy/".proxy_url($_REQUEST['url'], true), $img_str); elseif ($cachefile != '') file_put_contents($cachefile, $img_str); 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 $img_str; killme(); } function proxy_url($url, $writemode = false) { global $_SERVER; // Only continue if it isn't a local image and the isn't deactivated if (get_config("system", "proxy_disabled") OR proxy_is_local_image($url)) return($url); $a = get_app(); // Creating a sub directory to reduce the amount of files in the cache directory $basepath = $_SERVER["DOCUMENT_ROOT"]."/proxy"; $path = substr(hash("md5", $url), 0, 2); if (is_dir($basepath) and $writemode) if (!is_dir($basepath."/".$path)) { mkdir($basepath."/".$path); chmod($basepath."/".$path, 0777); } $path .= "/".strtr(base64_encode($url), '+/', '-_'); // Checking for valid extensions. Only add them if they are safe $pos = strrpos($url, "."); if ($pos) { $extension = strtolower(substr($url, $pos+1)); $pos = strpos($extension, "?"); if ($pos) $extension = substr($extension, 0, $pos); } $extensions = array("jpg", "jpeg", "gif", "png"); if (in_array($extension, $extensions)) $path .= ".".$extension; $proxypath = $a->get_baseurl()."/proxy/".$path; // Too long files aren't supported by Apache if (strlen($proxypath) > 250) return ($url); elseif ($writemode) return ($path); else return ($proxypath); } /** * @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(get_app()->get_baseurl()); $url = normalise_link($url); return (substr($url, 0, strlen($baseurl)) == $baseurl); } function proxy_parse_query($var) { /** * Use this function to parse out the query array element from * the output of parse_url(). */ $var = parse_url($var, PHP_URL_QUERY); $var = html_entity_decode($var); $var = explode('&', $var); $arr = array(); foreach($var as $val) { $x = explode('=', $val); $arr[$x[0]] = $x[1]; } unset($val, $x, $var); 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 (($queryvar['url'] != "") AND (substr($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) { return preg_replace_callback("/(<img [^>]*src *= *[\"'])([^\"']+)([\"'][^>]*>)/siU", "proxy_img_cb", $html); }