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KMLMiddleware

Author:
takinbo
Posted:
February 19, 2011
Language:
Python
Version:
1.2
Score:
0 (after 0 ratings)

This is a slight modification from the original version at http://djangosnippets.org/snippets/709/ and is a middleware designed to output the right headers for generated KML or KMZ content. In the case of KMZ content, it handles the compression of the original KML content into the KMZ format.

This version applies the processing to only requests ending with a .kml or .kmz in the URL. For instance, a request with the URL http://example.com/kml/foo.kml or http://example.com/foo.kmz will get processed by this middleware. 

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from cStringIO import StringIO
import zipfile

class KMLMiddleware(object):
    """
    Middleware for serving KML data and optionally converting it to KMZ if the right extension is used.
    """
    def process_response(self, request, response):
        request_file = request.path.split("/")[-1]

        if request_file.lower().endswith(".kmz"):
            kmz = StringIO()
            f = zipfile.ZipFile(kmz, 'w', zipfile.ZIP_DEFLATED)
            save_file_name = request_file[:request_file.lower().rfind(".kmz")] # strips off the .kmz extension
            f.writestr('%s.kml' % save_file_name, response.content)
            f.close()
            response.content = kmz.getvalue()
            kmz.close()
            response['Content-Type']        = 'application/vnd.google-earth.kmz'
            response['Content-Disposition'] = 'attachment; filename=%s.kmz' % save_file_name
            response['Content-Length']      = str(len(response.content))
        if request_file.lower().endswith(".kml"):
            save_file_name = request_file[:request_file.lower().rfind(".kml")] # strips off the .kmz extension
            response['Content-Type']        = 'application/vnd.google-earth.kml+xml'
            response['Content-Disposition'] = 'attachment; filename=%s.kml' % save_file_name
            response['Content-Length']      = str(len(response.content))
            
        return response

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Comments

mhulse (on September 8, 2011):

Works great! Thank you. :)

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mhulse (on September 11, 2011):

I noticed that the KML file does not update when new entries are added to my database... Is this by design? How would I update the KML view to update the KML output? Maybe I am missing something here?

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mhulse (on September 16, 2011):

Scratch my last comment... The new class-based-generic views and my cache back end is giving me guff! Thanks again!

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