How can I login to django using tastypie

Question

I'm trying to override is_authenticated in my custom authentication. I have something simple (to start with) like this:

class MyAuthentication(BasicAuthentication):
    def __init__(self, *args, **kwargs):
        super(MyAuthentication, self).__init__(*args, **kwargs)

    def is_authenticated(self, request, **kwargs):
        return True

then in my ModelResource I have

class LoginUserResource(ModelResource):

    class Meta:
        resource_name = 'login'
        queryset = User.objects.all()
        excludes = ['id', 'email', 'password', 'is_staff', 'is_superuser']
        list_allowed_methods = ['post']

        authentication = MyAuthentication()
        authorization = DjangoAuthorization()

I keep getting a 500 error back with "error_message": "column username is not unique". I only have one username in the db and it's the user I am trying to authenticate.

Any ideas as to why it's returning this error? How would I allow an api client to login?

Thanks for the help.

Answer 1

Your approach will try to create a new user with the username that you are authenticating with. This will bubble up at the DB layer, as you've noticed, that such a user already exists.

What you want is to create a UserResource, add a method on it that users can post to and login with data passing in username/password.

from django.contrib.auth.models import User
from django.contrib.auth import authenticate, login, logout
from tastypie.http import HttpUnauthorized, HttpForbidden
from django.conf.urls import url
from tastypie.utils import trailing_slash

class UserResource(ModelResource):
    class Meta:
        queryset = User.objects.all()
        fields = ['first_name', 'last_name', 'email']
        allowed_methods = ['get', 'post']
        resource_name = 'user'

    def override_urls(self):
        return [
            url(r"^(?P<resource_name>%s)/login%s$" %
                (self._meta.resource_name, trailing_slash()),
                self.wrap_view('login'), name="api_login"),
            url(r'^(?P<resource_name>%s)/logout%s$' %
                (self._meta.resource_name, trailing_slash()),
                self.wrap_view('logout'), name='api_logout'),
        ]

    def login(self, request, **kwargs):
        self.method_check(request, allowed=['post'])

        data = self.deserialize(request, request.raw_post_data, format=request.META.get('CONTENT_TYPE', 'application/json'))

        username = data.get('username', '')
        password = data.get('password', '')

        user = authenticate(username=username, password=password)
        if user:
            if user.is_active:
                login(request, user)
                return self.create_response(request, {
                    'success': True
                })
            else:
                return self.create_response(request, {
                    'success': False,
                    'reason': 'disabled',
                    }, HttpForbidden )
        else:
            return self.create_response(request, {
                'success': False,
                'reason': 'incorrect',
                }, HttpUnauthorized )

    def logout(self, request, **kwargs):
        self.method_check(request, allowed=['get'])
        if request.user and request.user.is_authenticated():
            logout(request)
            return self.create_response(request, { 'success': True })
        else:
            return self.create_response(request, { 'success': False }, HttpUnauthorized)

Now you can do send a POST to http://hostname/api/user/login with data { 'username' : 'me', 'password' : 'l33t' }.