middleware.py
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from importlib import import_module
import sys
from django.conf import settings
from django.http import Http404
from django.utils import six
from floraconcierge import shortcuts
from floraconcierge.apiauth.models import User
from floraconcierge.cache import get_request_cache, new_request_cache
from floraconcierge.client import ApiClient
from floraconcierge.errors import ResultObjectNotFoundError, MiddlewareError
def import_string(dotted_path):
"""
Import a dotted module path and return the attribute/class designated by the
last name in the path. Raise ImportError if the import failed.
Helper function from django 1.7
"""
try:
module_path, class_name = dotted_path.rsplit('.', 1)
except ValueError:
msg = "%s doesn't look like a module path" % dotted_path
six.reraise(ImportError, ImportError(msg), sys.exc_info()[2])
try:
# noinspection PyUnboundLocalVariable
module = import_module(module_path)
except ImportError, e:
six.reraise(ImportError, ImportError('%s. Tried to import %s' % (e.message, module_path)), sys.exc_info()[2])
try:
# noinspection PyUnboundLocalVariable
return getattr(module, class_name)
except AttributeError:
msg = 'Module "%s" does not define a "%s" attribute/class' % (
dotted_path, class_name)
six.reraise(ImportError, ImportError(msg), sys.exc_info()[2])
def initialize_apiclient(request):
err_pattern = 'floraconcierge.middleware.ApiClientMiddleware requires to be set settings.%s'
api_id = getattr(settings, 'FLORACONCIERGE_API_ID', None)
if not api_id:
raise ValueError(err_pattern % 'FLORACONCIERGE_API_ID')
secret = getattr(settings, 'FLORACONCIERGE_API_SECRET', None)
if not secret:
raise ValueError(err_pattern % 'FLORACONCIERGE_API_SECRET')
client = ApiClient(api_id, secret)
sess_env = request.session.get("__floraconcierge_api_env", None)
restored = False
if sess_env:
client.env = sess_env
restored = True
init_env = getattr(settings, 'FLORACONCIERGE_API_INIT_ENV', None)
if init_env:
init_env = import_string(init_env)
env = init_env(client, request, restored)
if env:
client.env = env
return client
class ApiClientMiddleware(object):
def process_request(self, request):
init = getattr(settings, 'FLORACONCIERGE_API_INIT_CLIENT', None)
if init:
init = import_string(init)
client = init(request)
else:
client = initialize_apiclient(request)
request.api = client
request.apienv = client.env
shortcuts.activate(client)
def process_response(self, request, response):
if hasattr(request, 'apienv') and hasattr(request, 'user'):
# Support api user authentication
if isinstance(request.user, User) and request.user.info:
request.apienv.user_auth_key = request.user.info.auth.auth_key
else:
request.apienv.user_auth_key = ''
request.session['__floraconcierge_api_env'] = request.apienv
return response
class ApiObjectNotFound404(object):
def process_exception(self, request, exception):
if isinstance(exception, ResultObjectNotFoundError):
raise Http404
_cache_cls = None
class RequestCacheMiddleware(object):
@staticmethod
def cache_cls():
global _cache_cls
if not _cache_cls:
cls = getattr(settings, 'FLORACONCIERGE_CACHE_CLASS', None)
if not cls:
raise MiddlewareError('Please define FLORACONCIERGE_CACHE_CLASS in settings for RequestCacheMiddleware')
_cache_cls = import_string(cls)
return _cache_cls
def process_request(self, request):
try:
cache = get_request_cache()
except MiddlewareError:
cache = new_request_cache(self.cache_cls())
cache.clear()
request.cache = cache