Just to avoid users from trying this with a to new (untested) php version

* Moved the check logic to 1 place
* All directly callable scripts just require this on top
* exit hard (-1) so we know scripts won't continue
* Return status 500 so no sync clients will try fancy stuff

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

Signed-off-by: Lukas Reschke <lukas@statuscode.ch>

Signed-off-by: Joas Schilling <coding@schilljs.com>

Gets rid of manual XML generation.

This reverts commit 6a1a4880.

We should use the proper content-type `application/xml` instead of the default `text/html` here.

Backport requested.

Add support for a reverse proxy that handles multiple domains via different
web roots (http[s]://proxy.tld/domain.tld/owncloud).

As the reverse proxy web root is transparent for the web server the
REQUEST_URI and SCRIPT_NAME need manual adjustments. This patch replace
the direct use of this _SERVER variables with function calls and extend
this functions to overwrite the web root. Additionally it adds a Sabre
request backend that extends the Sabre_HTTP_Request to use the same
functions.

make it possible to manually override the hostname and protocol if the automatic detection from ownCloud fails. This can happen in reverse proxy situations or with loadbalancers setups.

The specification is developed here:
http://www.freedesktop.org/wiki/Specifications/open-collaboration-services-1.7#CLOUD
will be moved to
http://www.freedesktop.org/wiki/Specifications/open-collaboration-services
as soon as everything is done.

add Open Collaboration API support. You can now connect your ownCloud with the KDE Social Desktop and push notifications to your Social News Plasmoid. This requires KDE trunk or KDE SV 4.5

<br /> is not a valid strict xhtml1.0 tag. Not semantic. Replacing it by CSS instructions on semantic tags.

center is not a valid strict xhtml1.0 tag (not semantic). At least, replacing it by a div with "center" class.