* Added sharemanager class
This is the central class where all API calls talk to (OCS/Activity).
This in turn talks to the share providers to get the actual sharing
done.
It uses all ShareObjects
* Added share class
Simple class to hold all the share properties that is passed around
* Added IShareProvider interface
Interface that providers os a share have to implement.
We cannot rely on the extension as the file may also be a valid TAR or ZIP file without such content. Especially when getting resources from the ownCloud appstore.
Currently the `getPath` methods returned `NULL` in case when a file with the specified ID does not exist. This however mandates that developers are checking for the `NULL` case and if they do not the door for bugs with all kind of impact is widely opened.
This is especially harmful if used in context with Views where the final result is limited based on the result of `getPath`, if `getPath` returns `NULL` PHP type juggles this to an empty string resulting in all possible kind of bugs.
While one could argue that this is a misusage of the API the fact is that it is very often misused and an exception will trigger an immediate stop of execution as well as log this behaviour and show a pretty error page.
I also adjusted some usages where I believe that we need to catch these errors, in most cases this is though simply an error that should hard-fail.
At first a bz2 handling in needs to be fixed; PEAR's Archive_Tar
otherwise gives the following error:
> Unsupported compression type "bz"
> Supported types are "gz", "bz2" and "lzma2"
After that we can whitelist the application/bz2 MIME type in the installer.
PHP will handle session cookies with an empty values as an E_WARNING error. ([php/#68063](https://bugs.php.net/bug.php?id=68063))
ownCloud sets the cookie to an empty value in case the session expires, it however after this starts a new session. Due to potential race conditions this can in unlikely cases lead to the fact that the session never gets restarted and the user is left with an empty cookie. PHP tries then to use the empty cookie which makes the instance not usable.
To work around any race condition we now tell PHP to explicitly delete the value which can be done by using `null` as value, PHP will then send a cookie with the value "deleted". Also theepiration has been set to -1.
Roeland Jago Douma
Arthur Schiwon
Robin Appelman
Bjoern Schiessle
Thomas Müller
Raghu Nayyar
Lukas Reschke
Morris Jobke
Stephen Colebrook
Joas Schilling
Vincent Petry
Volker Fröhlich
Roeland Jago Douma
Christian Weiske
Björn Schießle
Jörn Friedrich Dreyer