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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. 

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);
}