import base64
from django.contrib.auth.models import User
from django.core import mail
from django.http import HttpRequest
from django.test import TestCase
from tastypie.authentication import Authentication, BasicAuthentication, ApiKeyAuthentication, DigestAuthentication
from tastypie.http import HttpUnauthorized
from tastypie.models import ApiKey, create_api_key


# Be tricky.
from tastypie.authentication import python_digest
if python_digest is None:
    import warnings
    warnings.warn("Running tests without python_digest! Bad news!")


class AuthenticationTestCase(TestCase):
    def test_is_authenticated(self):
        auth = Authentication()
        request = HttpRequest()
        # Doesn't matter. Always true.
        self.assertTrue(auth.is_authenticated(None))
        self.assertTrue(auth.is_authenticated(request))

    def test_get_identifier(self):
        auth = Authentication()
        request = HttpRequest()
        self.assertEqual(auth.get_identifier(request), 'noaddr_nohost')

        request = HttpRequest()
        request.META['REMOTE_ADDR'] = '127.0.0.1'
        request.META['REMOTE_HOST'] = 'nebula.local'
        self.assertEqual(auth.get_identifier(request), '127.0.0.1_nebula.local')


class BasicAuthenticationTestCase(TestCase):
    fixtures = ['note_testdata.json']

    def test_is_authenticated(self):
        auth = BasicAuthentication()
        request = HttpRequest()

        # No HTTP Basic auth details should fail.
        self.assertEqual(isinstance(auth.is_authenticated(request), HttpUnauthorized), True)

        # HttpUnauthorized with auth type and realm
        self.assertEqual(auth.is_authenticated(request)['WWW-Authenticate'], 'Basic Realm="django-tastypie"')

        # Wrong basic auth details.
        request.META['HTTP_AUTHORIZATION'] = 'abcdefg'
        self.assertEqual(isinstance(auth.is_authenticated(request), HttpUnauthorized), True)

        # No password.
        request.META['HTTP_AUTHORIZATION'] = base64.b64encode('daniel')
        self.assertEqual(isinstance(auth.is_authenticated(request), HttpUnauthorized), True)

        # Wrong user/password.
        request.META['HTTP_AUTHORIZATION'] = base64.b64encode('daniel:pass')
        self.assertEqual(isinstance(auth.is_authenticated(request), HttpUnauthorized), True)

        # Correct user/password.
        john_doe = User.objects.get(username='johndoe')
        john_doe.set_password('pass')
        john_doe.save()
        request.META['HTTP_AUTHORIZATION'] = 'Basic %s' % base64.b64encode('johndoe:pass')
        self.assertEqual(auth.is_authenticated(request), True)

        # Regression: Password with colon.
        john_doe = User.objects.get(username='johndoe')
        john_doe.set_password('pass:word')
        john_doe.save()
        request.META['HTTP_AUTHORIZATION'] = 'Basic %s' % base64.b64encode('johndoe:pass:word')
        self.assertEqual(auth.is_authenticated(request), True)


class ApiKeyAuthenticationTestCase(TestCase):
    fixtures = ['note_testdata.json']

    def setUp(self):
        super(ApiKeyAuthenticationTestCase, self).setUp()
        ApiKey.objects.all().delete()

    def test_is_authenticated(self):
        auth = ApiKeyAuthentication()
        request = HttpRequest()

        # Simulate sending the signal.
        john_doe = User.objects.get(username='johndoe')
        create_api_key(User, instance=john_doe, created=True)

        # No username/api_key details should fail.
        self.assertEqual(isinstance(auth.is_authenticated(request), HttpUnauthorized), True)

        # Wrong username details.
        request.GET['username'] = 'foo'
        self.assertEqual(isinstance(auth.is_authenticated(request), HttpUnauthorized), True)

        # No api_key.
        request.GET['username'] = 'daniel'
        self.assertEqual(isinstance(auth.is_authenticated(request), HttpUnauthorized), True)

        # Wrong user/api_key.
        request.GET['username'] = 'daniel'
        request.GET['api_key'] = 'foo'
        self.assertEqual(isinstance(auth.is_authenticated(request), HttpUnauthorized), True)

        # Correct user/api_key.
        john_doe = User.objects.get(username='johndoe')
        request.GET['username'] = 'johndoe'
        request.GET['api_key'] = john_doe.api_key.key
        self.assertEqual(auth.is_authenticated(request), True)


class DigestAuthenticationTestCase(TestCase):
    fixtures = ['note_testdata.json']

    def setUp(self):
        super(DigestAuthenticationTestCase, self).setUp()
        ApiKey.objects.all().delete()

    def test_is_authenticated(self):
        auth = DigestAuthentication()
        request = HttpRequest()

        # Simulate sending the signal.
        john_doe = User.objects.get(username='johndoe')
        create_api_key(User, instance=john_doe, created=True)

        # No HTTP Basic auth details should fail.
        auth_request = auth.is_authenticated(request)
        self.assertEqual(isinstance(auth_request, HttpUnauthorized), True)

        # HttpUnauthorized with auth type and realm
        self.assertEqual(auth_request['WWW-Authenticate'].find('Digest'), 0)
        self.assertEqual(auth_request['WWW-Authenticate'].find(' realm="django-tastypie"') > 0, True)
        self.assertEqual(auth_request['WWW-Authenticate'].find(' opaque=') > 0, True)
        self.assertEqual(auth_request['WWW-Authenticate'].find('nonce=') > 0, True)

        # Wrong basic auth details.
        request.META['HTTP_AUTHORIZATION'] = 'abcdefg'
        auth_request = auth.is_authenticated(request)
        self.assertEqual(isinstance(auth_request, HttpUnauthorized), True)

        # No password.
        request.META['HTTP_AUTHORIZATION'] = base64.b64encode('daniel')
        auth_request = auth.is_authenticated(request)
        self.assertEqual(isinstance(auth_request, HttpUnauthorized), True)

        # Wrong user/password.
        request.META['HTTP_AUTHORIZATION'] = base64.b64encode('daniel:pass')
        auth_request = auth.is_authenticated(request)
        self.assertEqual(isinstance(auth_request, HttpUnauthorized), True)

        # Correct user/password.
        john_doe = User.objects.get(username='johndoe')
        request.META['HTTP_AUTHORIZATION'] = python_digest.build_authorization_request(
            john_doe.username,
            request.method,
            '/', # uri
            1,   # nonce_count
            digest_challenge=auth_request['WWW-Authenticate'],
            password=john_doe.api_key.key
        )
        auth_request = auth.is_authenticated(request)
        self.assertEqual(auth_request, True)