From cc036f74ff14c387f24d72f5a52f2f158208846e Mon Sep 17 00:00:00 2001
From: Klap-in <klapinklapin@gmail.com>
Date: Thu, 1 Aug 2013 23:06:03 +0200
Subject: remove hash for external images, but use token url parameter instead

---
 inc/common.php          | 19 +++++++------------
 inc/fetch.functions.php |  8 ++------
 inc/media.php           |  2 +-
 3 files changed, 10 insertions(+), 19 deletions(-)

diff --git a/inc/common.php b/inc/common.php
index 1b4d9e8e4..a34cf96c0 100644
--- a/inc/common.php
+++ b/inc/common.php
@@ -148,7 +148,7 @@ function pageinfo() {
     $info['id']  = $ID;
     $info['rev'] = $REV;
 
-    if(isset($_SERVER['REMOTE_USER'])) {
+    if(isset($_SERVER['REMOTE_USER'])) {
         $sub = new Subscription();
         $info['subscribed'] = $sub->user_subscription();
     } else {
@@ -474,7 +474,7 @@ function ml($id = '', $more = '', $direct = true, $sep = '&amp;', $abs = false)
 
     if(is_array($more)) {
         // add token for resized images
-        if($more['w'] || $more['h']){
+        if($more['w'] || $more['h'] || $isexternalimage){
             $more['tok'] = media_get_token($id,$more['w'],$more['h']);
         }
         // strip defaults for shorter URLs
@@ -485,12 +485,13 @@ function ml($id = '', $more = '', $direct = true, $sep = '&amp;', $abs = false)
         $more = buildURLparams($more, $sep);
     } else {
         $matches = array();
-        if (preg_match_all('/\b(w|h)=(\d*)\b/',$more,$matches,PREG_SET_ORDER)){
+        if (preg_match_all('/\b(w|h)=(\d*)\b/',$more,$matches,PREG_SET_ORDER) || $isexternalimage){
             $resize = array('w'=>0, 'h'=>0);
             foreach ($matches as $match){
                 $resize[$match[1]] = $match[2];
             }
-            $more .= $sep.'tok='.media_get_token($id,$resize['w'],$resize['h']);
+            $more .= $more === '' ? '' : $sep;
+            $more .= 'tok='.media_get_token($id,$resize['w'],$resize['h']);
         }
         $more = str_replace('cache=cache', '', $more); //skip default
         $more = str_replace(',,', ',', $more);
@@ -506,14 +507,8 @@ function ml($id = '', $more = '', $direct = true, $sep = '&amp;', $abs = false)
     // external URLs are always direct without rewriting
     if($isexternalimage) {
         $xlink .= 'lib/exe/fetch.php';
-        // add hash:
-        $xlink .= '?hash='.substr(PassHash::hmac('md5', $id, auth_cookiesalt()), 0, 6);
-        if($more) {
-            $xlink .= $sep.$more;
-            $xlink .= $sep.'media='.rawurlencode($id);
-        } else {
-            $xlink .= $sep.'media='.rawurlencode($id);
-        }
+        $xlink .= '?'.$more;
+        $xlink .= $sep.'media='.rawurlencode($id);
         return $xlink;
     }
 
diff --git a/inc/fetch.functions.php b/inc/fetch.functions.php
index 3c700b35b..207ad9e5f 100644
--- a/inc/fetch.functions.php
+++ b/inc/fetch.functions.php
@@ -101,8 +101,8 @@ function checkFileStatus(&$media, &$file, $rev = '', $width=0, $height=0) {
 
     //media to local file
     if(media_isexternal($media)) {
-        //check hash
-        if(substr(PassHash::hmac('md5', $media, auth_cookiesalt()), 0, 6) !== $INPUT->str('hash')) {
+        //check token for external image and additional for resized and cached images
+        if(media_get_token($media, $width, $height) !== $INPUT->str('tok')) {
             return array(412, 'Precondition Failed');
         }
         //handle external images
@@ -111,10 +111,6 @@ function checkFileStatus(&$media, &$file, $rev = '', $width=0, $height=0) {
             //download failed - redirect to original URL
             return array(302, $media);
         }
-        // check token for resized and cached images
-        if (($width || $height) && media_get_token($media, $width, $height) !== $INPUT->str('tok')) {
-            return array(412, 'Precondition Failed');
-        }
     } else {
         $media = cleanID($media);
         if(empty($media)) {
diff --git a/inc/media.php b/inc/media.php
index fbe1363ec..c0e3e9f82 100644
--- a/inc/media.php
+++ b/inc/media.php
@@ -1900,7 +1900,7 @@ function media_crop_image($file, $ext, $w, $h=0){
  */
 function media_get_token($id,$w,$h){
     // token is only required for modified images
-    if ($w || $h) {
+    if ($w || $h || media_isexternal($id)) {
         $token = $id;
         if ($w) $token .= '.'.$w;
         if ($h) $token .= '.'.$h;
-- 
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