[Owncloud] webdav fixes (Nokia N9 double encodes @ in caldav urls)

[Ed W]

> I'm actually not an owncloud dev; I'm the sabredav maintainer... If any issues surface though, I'm happy to apply any fixes to 1.6.x; It should be pretty much painless to update to a new version in the 1.6 range.
>

Could you chew over this hack...

--- 3rdparty/Sabre/DAV/URLUtil.php.orig    2012-12-10 15:50:05.759930750 
+0000
+++ 3rdparty/Sabre/DAV/URLUtil.php    2012-12-24 15:02:46.407943525 +0000
@@ -75,6 +75,9 @@
       */
      static function decodePathSegment($path) {

+    # N9 double encodes urls. Gingerly workaround probable such urls
+    $path = str_replace('%2540', '%40', $path);
+
          $path = rawurldecode($path);
          $encoding = mb_detect_encoding($path, 
array('UTF-8','ISO-8859-1'));



Basically my login tokens are email addresses, the N9 initially uses a 
correct escaped version, but then it seems to get back the list of 
calendars with hrefs (correctly?) escaped, it then double encodes these 
urls and requests each calendar (which obviously fails)

Double decoding is clearly dangerous, so I have limited it to this one 
specific value.  It's definitely a hack and seems to affect only a small 
number of devices (Nokia N9 only?).

Any thoughts on a better solution?

Thanks

Ed W