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overhauling proxy_url

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- Decode possible HTML entities in the input URL
- Add the safe extension for the shortpath as well
- Formatting
- Documentation
This commit is contained in:
Hypolite Petovan 2016-11-17 23:08:00 -05:00
parent 03943cb4c0
commit a6bdb2c34a
1 changed files with 59 additions and 38 deletions
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97
mod/proxy.php
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@ -233,66 +233,87 @@ function proxy_init() {
killme(); killme();
} }
function proxy_url($url, $writemode = false, $size = "") { /**
global $_SERVER; * @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(); $a = get_app();
if (substr($url, 0, strlen('http')) !== 'http') { if (substr($url, 0, strlen('http')) !== 'http') {
return($url); return $url;
} }
// Only continue if it isn't a local image and the isn't deactivated // Only continue if it isn't a local image and the isn't deactivated
if (proxy_is_local_image($url)) { if (proxy_is_local_image($url)) {
$url = str_replace(normalise_link($a->get_baseurl())."/", $a->get_baseurl()."/", $url); $url = str_replace(normalise_link($a->get_baseurl()) . '/', $a->get_baseurl() . '/', $url);
return($url); return $url;
} }
if (get_config("system", "proxy_disabled")) if (get_config('system', 'proxy_disabled')) {
return($url); return $url;
}
// Image URL may have encoded ampersands for display which aren't desirable for proxy
$url = html_entity_decode($url, ENT_NOQUOTES, 'UTF8');
// Creating a sub directory to reduce the amount of files in the cache directory // Creating a sub directory to reduce the amount of files in the cache directory
$basepath = $a->get_basepath()."/proxy"; $basepath = $a->get_basepath() . '/proxy';
$path = substr(hash("md5", $url), 0, 2); $shortpath = hash('md5', $url);
$longpath = substr($shortpath, 0, 2);
if (is_dir($basepath) and $writemode) if (is_dir($basepath) and $writemode) {
if (!is_dir($basepath."/".$path)) { if (!is_dir($basepath . '/' . $longpath)) {
mkdir($basepath."/".$path); mkdir($basepath . '/' . $longpath);
chmod($basepath."/".$path, 0777); chmod($basepath . '/' . $longpath, 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"); $longpath .= '/' . strtr(base64_encode($url), '+/', '-_');
if (in_array($extension, $extensions)) // Checking for valid extensions. Only add them if they are safe
$path .= ".".$extension; $pos = strrpos($url, '.');
if ($pos) {
$extension = strtolower(substr($url, $pos + 1));
$pos = strpos($extension, '?');
if ($pos) {
$extension = substr($extension, 0, $pos);
}
}
$proxypath = $a->get_baseurl()."/proxy/".$path; $extensions = array('jpg', 'jpeg', 'gif', 'png');
if (in_array($extension, $extensions)) {
$shortpath .= '.' . $extension;
$longpath .= '.' . $extension;
}
if ($size != "") $proxypath = $a->get_baseurl() . '/proxy/' . $longpath;
$size = ":".$size;
if ($size != '') {
$size = ':' . $size;
}
// Too long files aren't supported by Apache // Too long files aren't supported by Apache
// Writemode in combination with long files shouldn't be possible // Writemode in combination with long files shouldn't be possible
if ((strlen($proxypath) > 250) AND $writemode) if ((strlen($proxypath) > 250) AND $writemode) {
return (hash("md5", $url)); return hash('md5', $url);
elseif (strlen($proxypath) > 250) } elseif (strlen($proxypath) > 250) {
return ($a->get_baseurl()."/proxy/".hash("md5", $url)."?url=".urlencode($url)); return $a->get_baseurl() . '/proxy/' . $shortpath . '?url=' . urlencode($url);
elseif ($writemode) } elseif ($writemode) {
return ($path); return $longpath;
else } else {
return ($proxypath.$size); return $proxypath . $size;
}
} }
/** /**