== Accessing Own Cloud Files ==

To access files the user shares over a link, some hints could prove useful to save time in doing so

  * How to download the folder the user shared publicly
  * How to unpack that zip in Java (and how not to)
  * (TODO: how to upload files back if the user allows it)

=== How to download files ===

The user has the possibility to share his/her files over a link. Unfortunately the files can not directly be accessed over this link, but by adding a parameter to the link, they complete folder can be downloaded as a zip file. An Example would be

[https://clarin.fz-juelich.de/owncloud/public.php?service=files&t=76027110ab537d125ec2e77a0cc447fa]

which then becomes

[https://clarin.fz-juelich.de/owncloud/public.php?service=files&t=76027110ab537d125ec2e77a0cc447fa&download]

The zip file that is linked then can be downloaded by a normal GET request to the server.

=== How to unpack zip in Java===

The problem, at least with Java, is that the "version" of the ZIP file (I don't know if this is just a software or a specification issue) can not be unzipped using Java. When using 'file' to determine the file type it says:

Zip archive data, at least v3.0 to extract

The error that is thrown is 
{{{
 java.util.zip.ZipException: invalid LOC header (bad signature) 
}}}

Unfortunately, the standard ZIP-library in Java is only able to unpack successfully to v2.0. Whatever this means (I couldn't find out, but if anybody has an idea, feel free to add it).

Though I was able to use the Linux command line tool unzip (UnZip 6.00 of 20 April 2009) the file successfully. So there at least exists a work around.

=== (TODO how to upload files back to owncloud (if the user marks the right check box)) ===