apps/api/response.py

   1 # -*- encoding: utf-8 -*-
   2
   3 __author__= "Łukasz Rekucki"
   4 __date__ = "$2009-09-26 00:32:18$"
   5 __doc__ = "Extensible HTTP Responses."
   6
   7 from django.http import HttpResponse
   8 from django.utils import simplejson as json
   9
  10 MIME_PLAIN = 'text/plain'
  11 MIME_JSON = 'application/json'
  12
  13 class ResponseObject(object):
  14
  15     def __init__(self, code, mimetype=MIME_JSON):
  16         self._code = code
  17         self._mime = mimetype
  18
  19     def django_response(self, body=None):
  20         if body is None:
  21             data = ''
  22         elif self._mime == MIME_JSON:
  23             data = json.dumps(body, default=lambda o: repr(o) )
  24         else:
  25             data = u"%s\n%s" % (self.MESSAGE, unicode(body))
  26             data = data.encode('utf-8')
  27
  28         return HttpResponse(content=data, status=self._code, \
  29                 content_type=self._mime+'; charset=utf-8' )
  30
  31 class SuccessAllOk(ResponseObject):
  32     def __init__(self, **kwargs):
  33         ResponseObject.__init__(self, 200, **kwargs)
  34
  35 class EntityCreated(ResponseObject):
  36
  37     def __init__(self, **kwargs):
  38         ResponseObject.__init__(self, 201, **kwargs)
  39
  40     def django_response(self, url, body):
  41         response = ResponseObject.django_response(self, body)
  42         response['Location'] = url
  43         return response
  44
  45 class RequestAccepted(ResponseObject):
  46
  47     def __init__(self, **kwargs):
  48         ResponseObject.__init__(self, 202, **kwargs)
  49
  50     def django_response(self, ticket_status, ticket_uri):
  51         return ResponseObject.django_response(self, {
  52             'status': ticket_status,
  53             'refer_to': ticket_uri })
  54
  55 class SuccessNoContent(ResponseObject):
  56
  57     def __init__(self, **kwargs):
  58         ResponseObject.__init__(self, 204, **kwargs)
  59
  60     def django_response(self):
  61         return ResponseObject.django_response(self, body=None)
  62
  63 #
  64 # Client errors
  65 #
  66
  67 class BadRequest(ResponseObject):
  68
  69     def __init__(self, **kwargs):
  70         ResponseObject.__init__(self, 400, **kwargs)
  71
  72 class AccessDenied(ResponseObject):
  73
  74     def __init__(self, **kwargs):
  75         ResponseObject.__init__(self, 403, **kwargs)
  76
  77     def django_response(self, reason):
  78         return ResponseObject.django_response(self, \
  79             body={'reason': reason})
  80
  81 class EntityNotFound(ResponseObject):
  82
  83     def __init__(self, **kwargs):
  84         ResponseObject.__init__(self, 404, **kwargs)
  85
  86 class EntityGone(ResponseObject):
  87
  88     def __init__(self, **kwargs):
  89         ResponseObject.__init__(self, 410, **kwargs)
  90
  91
  92 class EntityConflict(ResponseObject):
  93
  94     def __init__(self, **kwargs):
  95         ResponseObject.__init__(self, 409, **kwargs)
  96
  97
  98 #
  99 # Server side errors
 100 #
 101 class NotImplemented(ResponseObject):
 102
 103     def __init__(self, **kwargs):
 104         ResponseObject.__init__(self, 501, **kwargs)
 105
 106 def validate_form(formclass, source='GET'):
 107     from functools import wraps
 108
 109     def decorator(func):
 110         @wraps(func)
 111         def decorated(self, request, *args, **kwargs):
 112             form = formclass(getattr(request,  source), request.FILES)
 113
 114             if not form.is_valid():
 115                 errorlist = [{'field': k, 'errors': e} for k,e in form.errors]
 116                 return BadRequest().django_response(errorlist)
 117
 118             return func(self, request, form, *args, **kwargs)
 119         return decorated
 120     return decorator
 121
 122
 123
 124
 125
 126