Synnefo

# Copyright 2011 GRNET S.A. All rights reserved.

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from functools import wraps

from logging import getLogger

from traceback import format_exc

from django.conf import settings

from django.http import (HttpResponse, HttpResponseBadRequest,

                         HttpResponseServerError, HttpResponseForbidden)

from synnefo.lib.astakos import get_user

from synnefo.plankton.backend import (ImageBackend, BackendException,

                                      NotAllowedError)

log = getLogger('synnefo.plankton')

def plankton_method(method):

    def decorator(func):

        @wraps(func)

        def wrapper(request, *args, **kwargs):

            try:

                get_user(request, settings.ASTAKOS_URL)

                if not request.user_uniq:

                    return HttpResponse(status=401)

                if request.method != method:

                    return HttpResponse(status=405)

                request.backend = ImageBackend(request.user_uniq)

                return func(request, *args, **kwargs)

            except (AssertionError, BackendException) as e:

                message = e.args[0] if e.args else ''

                return HttpResponseBadRequest(message)

            except NotAllowedError:

                return HttpResponseForbidden()

            except Exception as e:

                if settings.DEBUG:

                    message = format_exc(e)

                else:

                    message = ''

                log.exception(e)

                return HttpResponseServerError(message)

            finally:

                if hasattr(request, 'backend'):

                    request.backend.close()

        return wrapper

    return decorator