Create OC_JSON class, for single point of creating json responses.
No real logic change, this just cleans up the code a bit.

php check both, upload_max_filesize and post_max_size, when uploading a
file so we should do the same when figuring out the maximum size.

Signed-off-by: Florian Pritz <bluewind@xinu.at>

If the file wasn't uploaded successfully bail early.

Signed-off-by: Florian Pritz <bluewind@xinu.at>

This also moves session_start in lib/base.php down a bit because we need
OC::$SERVERROOT to get the config settings.

Signed-off-by: Florian Pritz <bluewind@xinu.at>

The checkboxes don't work because files.js is missing. Adding it leads
to the problem that it relies on files/ajax and most of the code only
works for logged in users.

The actions div contains undefined variables and doesn't work either.

Signed-off-by: Florian Pritz <bluewind@xinu.at>

No point in wasting resources if you don't show it.

This also fixes an undefined variable notice.

Signed-off-by: Florian Pritz <bluewind@xinu.at>

Signed-off-by: Florian Pritz <bluewind@xinu.at>

Signed-off-by: Florian Pritz <bluewind@xinu.at>

Created the following function:
 - checkLoggedIn
 - checkAdminUser
 - redirectToDefaultPage

Removed global vars are DOCUMENTROOT, SERVERROOT, SUBURI, WEBROOT and CONFIG_DATADIRECTORY

patch by Elias Probst