Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
// Based upon "Privacy Image Cache" by Tobias Hößl <https://github.com/CatoTH/>
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');
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;
$sizetype = "";
$basepath = $a->get_basepath();
// If the cache path isn't there, try to create it
if (!is_dir($basepath."/proxy"))
if (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") AND is_writable($basepath."/proxy"));
// Look for filename in the arguments
if ((isset($a->argv[1]) OR isset($a->argv[2]) OR isset($a->argv[3])) AND !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]) and ($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(array(".jpg", ".jpeg", ".gif", ".png"), array("","","",""), $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 != '') {
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 = qu("SELECT * FROM `photo` WHERE `resource-id` = '%s' LIMIT 1", $urlhash);
if (dbm::is_result($r)) {
$img_str = $r[0]['data'];
$mime = $r[0]["desc"];
if ($mime == "") $mime = "image/jpeg";
}
} else
$r = array();
if (!dbm::is_result($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);
}
}
}
$img_str_orig = $img_str;
// reduce quality - if it isn't a GIF
if ($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 $direct_cache) {
file_put_contents($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(App::get_baseurl()) . '/', App::get_baseurl() . '/', $url);
return $url;
}
if (get_config('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) and $writemode) {
if (!is_dir($basepath . '/' . $longpath)) {
mkdir($basepath . '/' . $longpath);
chmod($basepath . '/' . $longpath, 0777);
}
}
$longpath .= '/' . strtr(base64_encode($url), '+/', '-_');
// Extract the URL extension, disregarding GET parameters starting with ?
$question_mark_pos = strpos($url, '?');
if ($question_mark_pos === false) {
$question_mark_pos = strlen($url);
}
$dot_pos = strrpos($url, '.', $question_mark_pos - strlen($url));
if ($dot_pos !== false) {
$extension = strtolower(substr($url, $dot_pos + 1, $question_mark_pos - ($dot_pos + 1)));
}
$extensions = array('jpg', 'jpeg', 'gif', 'png');
if (in_array($extension, $extensions)) {
$shortpath .= '.' . $extension;
$longpath .= '.' . $extension;
}
$proxypath = App::get_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) AND $writemode) {
return $shortpath;
} elseif (strlen($proxypath) > 250) {
return App::get_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(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) {
$a = get_app();
$html = str_replace(normalise_link(App::get_baseurl())."/", App::get_baseurl()."/", $html);
return preg_replace_callback("/(<img [^>]*src *= *[\"'])([^\"']+)([\"'][^>]*>)/siU", "proxy_img_cb", $html);
}