136 lines
4.8 KiB
Python
136 lines
4.8 KiB
Python
# Copyright 2014, Rackspace, US, Inc.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
import functools
|
|
import json
|
|
import logging
|
|
|
|
from django.conf import settings
|
|
from django import http
|
|
from django.utils import decorators
|
|
|
|
from oslo_serialization import jsonutils
|
|
|
|
from horizon import exceptions
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
class AjaxError(Exception):
|
|
def __init__(self, http_status, msg):
|
|
self.http_status = http_status
|
|
super(AjaxError, self).__init__(msg)
|
|
|
|
http_errors = exceptions.UNAUTHORIZED + exceptions.NOT_FOUND + \
|
|
exceptions.RECOVERABLE + (AjaxError, )
|
|
|
|
|
|
class CreatedResponse(http.HttpResponse):
|
|
def __init__(self, location, data=None):
|
|
if data is not None:
|
|
content = jsonutils.dumps(data, sort_keys=settings.DEBUG)
|
|
content_type = 'application/json'
|
|
else:
|
|
content = ''
|
|
content_type = None
|
|
super(CreatedResponse, self).__init__(status=201, content=content,
|
|
content_type=content_type)
|
|
self['Location'] = location
|
|
|
|
|
|
class JSONResponse(http.HttpResponse):
|
|
def __init__(self, data, status=200):
|
|
if status == 204:
|
|
content = ''
|
|
else:
|
|
content = jsonutils.dumps(data, sort_keys=settings.DEBUG)
|
|
|
|
super(JSONResponse, self).__init__(
|
|
status=status,
|
|
content=content,
|
|
content_type='application/json',
|
|
)
|
|
|
|
|
|
def ajax(authenticated=True, data_required=False):
|
|
'''Provide a decorator to wrap a view method so that it may exist in an
|
|
entirely AJAX environment:
|
|
|
|
- data decoded from JSON as input and data coded as JSON as output
|
|
- result status is coded in the HTTP status code; any non-2xx response
|
|
data will be coded as a JSON string, otherwise the response type (always
|
|
JSON) is specific to the method called.
|
|
|
|
if authenticated is true then we'll make sure the current user is
|
|
authenticated.
|
|
|
|
If data_required is true then we'll assert that there is a JSON body
|
|
present.
|
|
|
|
The wrapped view method should return either:
|
|
|
|
- JSON serialisable data
|
|
- an object of the django http.HttpResponse subclass (one of JSONResponse
|
|
or CreatedResponse is suggested)
|
|
- nothing
|
|
|
|
Methods returning nothing (or None explicitly) will result in a 204 "NO
|
|
CONTENT" being returned to the caller.
|
|
'''
|
|
def decorator(function, authenticated=authenticated,
|
|
data_required=data_required):
|
|
@functools.wraps(function,
|
|
assigned=decorators.available_attrs(function))
|
|
def _wrapped(self, request, *args, **kw):
|
|
if authenticated and not request.user.is_authenticated():
|
|
return JSONResponse('not logged in', 401)
|
|
if not request.is_ajax():
|
|
return JSONResponse('request must be AJAX', 400)
|
|
|
|
# decode the JSON body if present
|
|
request.DATA = None
|
|
if request.body:
|
|
try:
|
|
request.DATA = json.loads(request.body)
|
|
except (TypeError, ValueError) as e:
|
|
return JSONResponse('malformed JSON request: %s' % e, 400)
|
|
|
|
if data_required:
|
|
if not request.DATA:
|
|
return JSONResponse('request requires JSON body', 400)
|
|
|
|
# invoke the wrapped function, handling exceptions sanely
|
|
try:
|
|
data = function(self, request, *args, **kw)
|
|
if isinstance(data, http.HttpResponse):
|
|
return data
|
|
elif data is None:
|
|
return JSONResponse('', status=204)
|
|
return JSONResponse(data)
|
|
except http_errors as e:
|
|
# exception was raised with a specific HTTP status
|
|
if hasattr(e, 'http_status'):
|
|
http_status = e.http_status
|
|
elif hasattr(e, 'code'):
|
|
http_status = e.code
|
|
else:
|
|
log.exception('HTTP exception with no status/code')
|
|
return JSONResponse(str(e), 500)
|
|
return JSONResponse(str(e), http_status)
|
|
except Exception as e:
|
|
log.exception('error invoking apiclient')
|
|
return JSONResponse(str(e), 500)
|
|
|
|
return _wrapped
|
|
return decorator
|