import cStringIO, zipfile

from django.conf import settings

from django.http import HttpResponse

from django.template import loader

def compress_kml(kml):

    "Returns compressed KMZ from the given KML string."

    kmz = cStringIO.StringIO()

    zf = zipfile.ZipFile(kmz, 'a', zipfile.ZIP_DEFLATED)

    zf.writestr('doc.kml', kml.encode(settings.DEFAULT_CHARSET))

    zf.close()

    kmz.seek(0)

    return kmz.read()

def render_to_kml(*args, **kwargs):

    "Renders the response as KML (using the correct MIME type)."

    return HttpResponse(loader.render_to_string(*args, **kwargs),

                        mimetype='application/vnd.google-earth.kml+xml')

def render_to_kmz(*args, **kwargs):

    """

    Compresses the KML content and returns as KMZ (using the correct 

    MIME type).

    """

    return HttpResponse(compress_kml(loader.render_to_string(*args, **kwargs)),

                        mimetype='application/vnd.google-earth.kmz')

def render_to_text(*args, **kwargs):

    "Renders the response using the MIME type for plain text."

    return HttpResponse(loader.render_to_string(*args, **kwargs),

                        mimetype='text/plain')