Commit d509643d authored by Maël Kervella's avatar Maël Kervella

API: Useful functions

JSONResponse, JSONSuccess and JSONError are for building answers
accept_method is a decorator to check if the method to access the view
is accepted
parent b4fcadae
# Re2o est un logiciel d'administration développé initiallement au rezometz. Il
# se veut agnostique au réseau considéré, de manière à être installable en
# quelques clics.
#
# Copyright © 2018 Maël Kervella
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""api.utils.
Set of various and usefull functions for the API app
"""
from rest_framework.renderers import JSONRenderer
from django.http import HttpResponse
class JSONResponse(HttpResponse):
"""A JSON response that can be send as an HTTP response.
Usefull in case of REST API.
"""
def __init__(self, data, **kwargs):
"""Initialisz a JSONResponse object.
Args:
data: the data to render as JSON (often made of lists, dicts,
strings, boolean and numbers). See `JSONRenderer.render(data)` for
further details.
Creates:
An HTTPResponse containing the data in JSON format.
"""
content = JSONRenderer().render(data)
kwargs['content_type'] = 'application/json'
super(JSONResponse, self).__init__(content, **kwargs)
class JSONError(JSONResponse):
"""A JSON response when the request failed.
"""
def __init__(self, error_msg, data=None, **kwargs):
"""Initialise a JSONError object.
Args:
error_msg: A message explaining where the error is.
data: An optional field for further data to send along.
Creates:
A JSONResponse containing a field `status` set to `error` and a field
`reason` containing `error_msg`. If `data` argument has been given,
a field `data` containing it is added to the JSON response.
"""
response = {
'status' : 'error',
'reason' : error_msg
}
if data is not None:
response['data'] = data
super(JSONError, self).__init__(response, **kwargs)
class JSONSuccess(JSONResponse):
"""A JSON response when the request suceeded.
"""
def __init__(self, data=None, **kwargs):
"""Initialise a JSONSucess object.
Args:
error_msg: A message explaining where the error is.
data: An optional field for further data to send along.
Creates:
A JSONResponse containing a field `status` set to `sucess`. If `data`
argument has been given, a field `data` containing it is added to the
JSON response.
"""
response = {
'status' : 'success',
}
if data is not None:
response['data'] = data
super(JSONSuccess, self).__init__(response, **kwargs)
def accept_method(methods):
"""Decorator to set a list of accepted request method.
Check if the method used is accepted. If not, send a NotAllowed response.
"""
def decorator(view):
def wrapper(request, *args, **kwargs):
if request.method in methods:
return view(request, *args, **kwargs)
else:
return JSONError('Invalid request method. Request methods authorize are '+str(methods))
return view(request, *args, **kwargs)
return wrapper
return decorator
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