def image_handler(request, model_name, field_name, key, extension):
extension = extension.upper()
if extension not in VALID_EXTENSIONS:
raise Http404("Unknown extension: %s" % extension)
try:
field_config = THUMBNAIL_OPTIONS[model_name][field_name]
except KeyError:
raise Http404("No configuration found for %s.%s" % (model_name, field_name))
try:
instance = field_config.get_instance(key)
except ObjectDoesNotExist:
raise Http404("%s with key '%s' not found" % (model_name, key))
file_field = getattr(instance, field_name)
config = request.GET.get('config', [])
if config:
try:
config = decode_from_url(config, model_name, field_name, key, instance=instance)
except:
if settings.DEBUG:
raise
else:
raise Http404("Could not decode configuration.")
else:
raise Http404("No image configuration provided.")
if settings.THUMBNAIL_DEBUG and \
request.GET.get('echo', 'no').lower() in ['true', 'yes']:
return render_to_response("sorl_url/debug.html", config)
options = dict(field_config.options)
options.update(config.get('options', {}))
options['format'] = VALID_EXTENSIONS[extension]
backend = field_config.model_config.get_backend()
thumbnail = backend.get_thumbnail(file_field, config['geometry'], **options)
if getattr(settings, 'SORL_URL_SERVE_DIRECT', False):
import mimetypes
import time
from django.http import CompatibleStreamingHttpResponse
from django.utils.http import http_date
mimetype, encoding = mimetypes.guess_type("prefix.%s" % extension)
epoch_timestamp = time.time()
mimetype = mimetype or 'application/octet-stream'
data = thumbnail.read()
response = CompatibleStreamingHttpResponse(data, content_type=mimetype)
response["Last-Modified"] = http_date(epoch_timestamp)
response["Content-Length"] = len(data)
return response
if getattr(settings, 'SORL_URL_PERMANENT_REDIRECT', False):
redirect = HttpResponsePermanentRedirect
else:
redirect = HttpResponseRedirect
return redirect(thumbnail.url)