{
 'typ': 'JWT',
 'alg': 'HS256'
}

{
 "sub": "1234567890",
 "name": "John Doe",
 "admin": true
}

REST_FRAMEWORK = {
 'DEFAULT_AUTHENTICATION_CLASSES': (
  'rest_framework_jwt.authentication.JSONWebTokenAuthentication',
  'rest_framework.authentication.SessionAuthentication',
  'rest_framework.authentication.BasicAuthentication',
 ),
}

JWT_AUTH = {
 'JWT_EXPIRATION_DELTA': datetime.timedelta(days=1),
}

from rest_framework_jwt.settings import api_settings

jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER

payload = jwt_payload_handler(user)
token = jwt_encode_handler(payload)

from rest_framework_jwt.views import obtain_jwt_token

urlpatterns = [
 url(r'^authorizations/$', obtain_jwt_token),
]

class ObtainJSONWebToken(JSONWebTokenAPIView):
 """
 API View that receives a POST with a user's username and password.

 Returns a JSON Web Token that can be used for authenticated requests.
 """
 serializer_class = JSONWebTokenSerializer

def post(self, request, *args, **kwargs):
  serializer = self.get_serializer(data=request.data)

  if serializer.is_valid():
   user = serializer.object.get('user') or request.user
   token = serializer.object.get('token')
   response_data = jwt_response_payload_handler(token, user, request)
   response = Response(response_data)
   if api_settings.JWT_AUTH_COOKIE:
    expiration = (datetime.utcnow() +
        api_settings.JWT_EXPIRATION_DELTA)
    response.set_cookie(api_settings.JWT_AUTH_COOKIE,
         token,
         expires=expiration,
         httponly=True)
   return response

  return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

def dispatch(self, request, *args, **kwargs):
  """
  `.dispatch()` is pretty much the same as Django's regular dispatch,
  but with extra hooks for startup, finalize, and exception handling.
  """
  self.args = args
  self.kwargs = kwargs
  request = self.initialize_request(request, *args, **kwargs)
  self.request = request
  self.headers = self.default_response_headers # deprecate?

  try:
   self.initial(request, *args, **kwargs)

   # Get the appropriate handler method
   if request.method.lower() in self.http_method_names:
    handler = getattr(self, request.method.lower(),
         self.http_method_not_allowed)
   else:
    handler = self.http_method_not_allowed

   response = handler(request, *args, **kwargs)

  except Exception as exc:
   response = self.handle_exception(exc)

  self.response = self.finalize_response(request, response, *args, **kwargs)
  return self.response

def initialize_request(self, request, *args, **kwargs):
  """
  Returns the initial request object.
  """
  parser_context = self.get_parser_context(request)

  return Request(
   request,
   parsers=self.get_parsers(),
   authenticators=self.get_authenticators(),
   negotiator=self.get_content_negotiator(),
   parser_context=parser_context
  )

def get_authenticators(self):
  """
  Instantiates and returns the list of authenticators that this view can use.
  """
  return [auth() for auth in self.authentication_classes]

def initial(self, request, *args, **kwargs):
  """
  Runs anything that needs to occur prior to calling the method handler.
  """
  self.format_kwarg = self.get_format_suffix(**kwargs)

  # Perform content negotiation and store the accepted info on the request
  neg = self.perform_content_negotiation(request)
  request.accepted_renderer, request.accepted_media_type = neg

  # Determine the API version, if versioning is in use.
  version, scheme = self.determine_version(request, *args, **kwargs)
  request.version, request.versioning_scheme = version, scheme

  # Ensure that the incoming request is permitted
  self.perform_authentication(request)
  self.check_permissions(request)
  self.check_throttles(request)

@property
 def user(self):
  """
  Returns the user associated with the current request, as authenticated
  by the authentication classes provided to the request.
  """
  if not hasattr(self, '_user'):
   with wrap_attributeerrors():
    self._authenticate()
  return self._user

def _authenticate(self):
  """
  Attempt to authenticate the request using each authentication instance
  in turn.
  """
  for authenticator in self.authenticators:
   try:
    user_auth_tuple = authenticator.authenticate(self)
   except exceptions.APIException:
    self._not_authenticated()
    raise

   if user_auth_tuple is not None:
    self._authenticator = authenticator
    self.user, self.auth = user_auth_tuple
    return

  self._not_authenticated()

def _not_authenticated(self):
  """
  Set authenticator, user & authtoken representing an unauthenticated request.

  Defaults are None, AnonymousUser & None.
  """
  self._authenticator = None

  if api_settings.UNAUTHENTICATED_USER:
   self.user = api_settings.UNAUTHENTICATED_USER()
  else:
   self.user = None

  if api_settings.UNAUTHENTICATED_TOKEN:
   self.auth = api_settings.UNAUTHENTICATED_TOKEN()
  else:
   self.auth = None