friendica_2021-01/mod/proxy.php
Andrej Stieben db949bb802 Updated modules to allow for partial overrides without errors
Only define functions if they have not been defined before, e.g. in themes. This makes it possible to override parts of a module and still use the other functions.
2016-02-05 21:52:39 +01:00

364 lines
10 KiB
PHP

<?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");
if(! function_exists('proxy_init')) {
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 = 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);
}
}
}
$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 $img_str;
killme();
}
}
if(! function_exists('proxy_url')) {
function proxy_url($url, $writemode = false, $size = "") {
global $_SERVER;
$a = get_app();
if (substr($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)) {
$url = str_replace(normalise_link($a->get_baseurl())."/", $a->get_baseurl()."/", $url);
return($url);
}
if (get_config("system", "proxy_disabled"))
return($url);
// Creating a sub directory to reduce the amount of files in the cache directory
$basepath = $a->get_basepath()."/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;
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 (hash("md5", $url));
elseif (strlen($proxypath) > 250)
return ($a->get_baseurl()."/proxy/".hash("md5", $url)."?url=".urlencode($url));
elseif ($writemode)
return ($path);
else
return ($proxypath.$size);
}
}
/**
* @param $url string
* @return boolean
*/
if(! function_exists('proxy_is_local_image')) {
function proxy_is_local_image($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)) == $baseurl);
}
}
if(! function_exists('proxy_parse_query')) {
function proxy_parse_query($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 $arr;
}
}
if(! function_exists('proxy_img_cb')) {
function proxy_img_cb($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])).$matches[3];
}
}
if(! function_exists('proxy_parse_html')) {
function proxy_parse_html($html) {
$a = get_app();
$html = str_replace(normalise_link($a->get_baseurl())."/", $a->get_baseurl()."/", $html);
return preg_replace_callback("/(<img [^>]*src *= *[\"'])([^\"']+)([\"'][^>]*>)/siU", "proxy_img_cb", $html);
}
}