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Hotpatch for infinite redirection-following loop seen processing URLs to http://clojure.org/ -- if we end up with an unstable redirect target (final item in a redirect chain ends up redirecting us somewhere else when we visit it again), just save the last version we saw instead of trying to start over.

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Pretty much everything in File and File_redirection initial processing needs to be rewritten to be non-awful; this code is very hard to follow and very easy to make huge bugs. A fair amount of the complication is probably obsoleted by the redirection following being built into HTTPClient now.
This commit is contained in:
Brion Vibber 2010-05-25 13:09:21 -07:00
parent dc22ed8480
commit 95159112b2
1 changed files with 19 additions and 3 deletions
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22
classes/File.php
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@ -116,7 +116,11 @@ class File extends Memcached_DataObject
return false;
}
function processNew($given_url, $notice_id=null) {
/**
* @fixme refactor this mess, it's gotten pretty scary.
* @param bool $followRedirects
*/
function processNew($given_url, $notice_id=null, $followRedirects=true) {
if (empty($given_url)) return -1; // error, no url to process
$given_url = File_redirection::_canonUrl($given_url);
if (empty($given_url)) return -1; // error, no url to process
@ -124,6 +128,10 @@ class File extends Memcached_DataObject
if (empty($file)) {
$file_redir = File_redirection::staticGet('url', $given_url);
if (empty($file_redir)) {
// @fixme for new URLs this also looks up non-redirect data
// such as target content type, size, etc, which we need
// for File::saveNew(); so we call it even if not following
// new redirects.
$redir_data = File_redirection::where($given_url);
if (is_array($redir_data)) {
$redir_url = $redir_data['url'];
@ -134,11 +142,19 @@ class File extends Memcached_DataObject
throw new ServerException("Can't process url '$given_url'");
}
// TODO: max field length
if ($redir_url === $given_url || strlen($redir_url) > 255) {
if ($redir_url === $given_url || strlen($redir_url) > 255 || !$followRedirects) {
$x = File::saveNew($redir_data, $given_url);
$file_id = $x->id;
} else {
$x = File::processNew($redir_url, $notice_id);
// This seems kind of messed up... for now skipping this part
// if we're already under a redirect, so we don't go into
// horrible infinite loops if we've been given an unstable
// redirect (where the final destination of the first request
// doesn't match what we get when we ask for it again).
//
// Seen in the wild with clojure.org, which redirects through
// wikispaces for auth and appends session data in the URL params.
$x = File::processNew($redir_url, $notice_id, /*followRedirects*/false);
$file_id = $x->id;
File_redirection::saveNew($redir_data, $file_id, $given_url);
}