Upload handlers for content objects

*Title: Upload handlers for content objects

*Incentive:
Make it possible for extensions to handle the creation of content objects
from uploaded files. They can for instance create multiple objects and
fill in multiple attributes.

*Documentation:
This extension enables you to write upload handlers for
content objects in an extension. You can configure 
different MIME-Types to execute different upload handlers.

The upload handlers are useful for doing automatic import
or conversion of documents upon upload. For example importing
OpenOffice.org documents when uploading them.

The upload system will be used by both normal web based uploading as well
as WebDAV put requests.

To enable a upload handler for a specific mimetype you need
to set the following setting in upload.ini.
MimeUploadHandlerMap[<mime_type>]=<handler_identifier>

The <handler_identifier> will be the name of the class that exists in a given
extension.
e.g. if the idenfier was called ezopenofficeuploadhandler it would look for
extension/*/uploadhandlers/ezopenofficeuploadhandler.php and use ezopenofficeuploadhandler
for the class.

INI example:
[CreateSettings]
MimeUploadHandlerMap[application/vnd.sun.xml.writer]=ezopenofficeuploadhandler

Example code of a upload handler is shown below:

include_once( 'kernel/classes/ezcontentuploadhandler.php' );

class eZOpenofficeUploadHandler extends eZContentUploadHandler
{
    function eZOpenofficeUploadHandler()
    {
        $this->eZContentUploadHandler( 'OOo file handling', 'openoffice' );
    }

    /*!
      Handles the uploading of OpenOffice.org documents.
    */
    function handleFile( &$upload, &$result,
                         $filePath, $originalFilename, $mimeInfo,
                         $location, $existingNode )
    {
        // Implement your import/conversion routine here
        copy( $filepath, "var/cache/oofile.sxw" );
    }
}