import os
import re

from django.conf import global_settings, settings
from django.contrib.sites.models import Site, RequestSite
from django.contrib.auth.models import User
from django.core import mail
from django.core.urlresolvers import reverse, NoReverseMatch
from django.http import QueryDict
from django.utils.encoding import force_text
from django.utils.html import escape
from django.utils.http import urlquote
from django.test import TestCase
from django.test.utils import override_settings

from django.contrib.auth import SESSION_KEY, REDIRECT_FIELD_NAME
from django.contrib.auth.forms import (AuthenticationForm, PasswordChangeForm,
                SetPasswordForm, PasswordResetForm)
from django.contrib.auth.tests.utils import skipIfCustomUser


@override_settings(
    LANGUAGES=(
        ('en', 'English'),
    ),
    LANGUAGE_CODE='en',
    TEMPLATE_LOADERS=global_settings.TEMPLATE_LOADERS,
    TEMPLATE_DIRS=(
        os.path.join(os.path.dirname(__file__), 'templates'),
    ),
    USE_TZ=False,
    PASSWORD_HASHERS=('django.contrib.auth.hashers.SHA1PasswordHasher',),
)
class AuthViewsTestCase(TestCase):
    """
    Helper base class for all the follow test cases.
    """
    fixtures = ['authtestdata.json']
    urls = 'django.contrib.auth.tests.urls'

    def login(self, password='password'):
        response = self.client.post('/login/', {
            'username': 'testclient',
            'password': password,
            })
        self.assertEqual(response.status_code, 302)
        self.assertTrue(response['Location'].endswith(settings.LOGIN_REDIRECT_URL))
        self.assertTrue(SESSION_KEY in self.client.session)

    def assertContainsEscaped(self, response, text, **kwargs):
        return self.assertContains(response, escape(force_text(text)), **kwargs)


@skipIfCustomUser
class AuthViewNamedURLTests(AuthViewsTestCase):
    urls = 'django.contrib.auth.urls'

    def test_named_urls(self):
        "Named URLs should be reversible"
        expected_named_urls = [
            ('login', [], {}),
            ('logout', [], {}),
            ('password_change', [], {}),
            ('password_change_done', [], {}),
            ('password_reset', [], {}),
            ('password_reset_done', [], {}),
            ('password_reset_confirm', [], {
                'uidb36': 'aaaaaaa',
                'token': '1111-aaaaa',
            }),
            ('password_reset_complete', [], {}),
        ]
        for name, args, kwargs in expected_named_urls:
            try:
                reverse(name, args=args, kwargs=kwargs)
            except NoReverseMatch:
                self.fail("Reversal of url named '%s' failed with NoReverseMatch" % name)


@skipIfCustomUser
class PasswordResetTest(AuthViewsTestCase):

    def test_email_not_found(self):
        "Error is raised if the provided email address isn't currently registered"
        response = self.client.get('/password_reset/')
        self.assertEqual(response.status_code, 200)
        response = self.client.post('/password_reset/', {'email': 'not_a_real_email@email.com'})
        self.assertContainsEscaped(response, PasswordResetForm.error_messages['unknown'])
        self.assertEqual(len(mail.outbox), 0)

    def test_email_found(self):
        "Email is sent if a valid email address is provided for password reset"
        response = self.client.post('/password_reset/', {'email': 'staffmember@example.com'})
        self.assertEqual(response.status_code, 302)
        self.assertEqual(len(mail.outbox), 1)
        self.assertTrue("http://" in mail.outbox[0].body)
        self.assertEqual(settings.DEFAULT_FROM_EMAIL, mail.outbox[0].from_email)

    def test_email_found_custom_from(self):
        "Email is sent if a valid email address is provided for password reset when a custom from_email is provided."
        response = self.client.post('/password_reset_from_email/', {'email': 'staffmember@example.com'})
        self.assertEqual(response.status_code, 302)
        self.assertEqual(len(mail.outbox), 1)
        self.assertEqual("staffmember@example.com", mail.outbox[0].from_email)

    def _test_confirm_start(self):
        # Start by creating the email
        response = self.client.post('/password_reset/', {'email': 'staffmember@example.com'})
        self.assertEqual(response.status_code, 302)
        self.assertEqual(len(mail.outbox), 1)
        return self._read_signup_email(mail.outbox[0])

    def _read_signup_email(self, email):
        urlmatch = re.search(r"https?://[^/]*(/.*reset/\S*)", email.body)
        self.assertTrue(urlmatch is not None, "No URL found in sent email")
        return urlmatch.group(), urlmatch.groups()[0]

    def test_confirm_valid(self):
        url, path = self._test_confirm_start()
        response = self.client.get(path)
        # redirect to a 'complete' page:
        self.assertContains(response, "Please enter your new password")

    def test_confirm_invalid(self):
        url, path = self._test_confirm_start()
        # Let's munge the token in the path, but keep the same length,
        # in case the URLconf will reject a different length.
        path = path[:-5] + ("0" * 4) + path[-1]

        response = self.client.get(path)
        self.assertContains(response, "The password reset link was invalid")

    def test_confirm_invalid_user(self):
        # Ensure that we get a 200 response for a non-existant user, not a 404
        response = self.client.get('/reset/123456-1-1/')
        self.assertContains(response, "The password reset link was invalid")

    def test_confirm_overflow_user(self):
        # Ensure that we get a 200 response for a base36 user id that overflows int
        response = self.client.get('/reset/zzzzzzzzzzzzz-1-1/')
        self.assertContains(response, "The password reset link was invalid")

    def test_confirm_invalid_post(self):
        # Same as test_confirm_invalid, but trying
        # to do a POST instead.
        url, path = self._test_confirm_start()
        path = path[:-5] + ("0" * 4) + path[-1]

        self.client.post(path, {
            'new_password1': 'anewpassword',
            'new_password2': ' anewpassword',
        })
        # Check the password has not been changed
        u = User.objects.get(email='staffmember@example.com')
        self.assertTrue(not u.check_password("anewpassword"))

    def test_confirm_complete(self):
        url, path = self._test_confirm_start()
        response = self.client.post(path, {'new_password1': 'anewpassword',
                                           'new_password2': 'anewpassword'})
        # It redirects us to a 'complete' page:
        self.assertEqual(response.status_code, 302)
        # Check the password has been changed
        u = User.objects.get(email='staffmember@example.com')
        self.assertTrue(u.check_password("anewpassword"))

        # Check we can't use the link again
        response = self.client.get(path)
        self.assertContains(response, "The password reset link was invalid")

    def test_confirm_different_passwords(self):
        url, path = self._test_confirm_start()
        response = self.client.post(path, {'new_password1': 'anewpassword',
                                           'new_password2': 'x'})
        self.assertContainsEscaped(response, SetPasswordForm.error_messages['password_mismatch'])


@override_settings(AUTH_USER_MODEL='auth.CustomUser')
class CustomUserPasswordResetTest(AuthViewsTestCase):
    fixtures = ['custom_user.json']

    def _test_confirm_start(self):
        # Start by creating the email
        response = self.client.post('/password_reset/', {'email': 'staffmember@example.com'})
        self.assertEqual(response.status_code, 302)
        self.assertEqual(len(mail.outbox), 1)
        return self._read_signup_email(mail.outbox[0])

    def _read_signup_email(self, email):
        urlmatch = re.search(r"https?://[^/]*(/.*reset/\S*)", email.body)
        self.assertTrue(urlmatch is not None, "No URL found in sent email")
        return urlmatch.group(), urlmatch.groups()[0]

    def test_confirm_valid_custom_user(self):
        url, path = self._test_confirm_start()
        response = self.client.get(path)
        # redirect to a 'complete' page:
        self.assertContains(response, "Please enter your new password")


@skipIfCustomUser
class ChangePasswordTest(AuthViewsTestCase):

    def fail_login(self, password='password'):
        response = self.client.post('/login/', {
            'username': 'testclient',
            'password': password,
        })
        self.assertContainsEscaped(response, AuthenticationForm.error_messages['invalid_login'])

    def logout(self):
        response = self.client.get('/logout/')

    def test_password_change_fails_with_invalid_old_password(self):
        self.login()
        response = self.client.post('/password_change/', {
            'old_password': 'donuts',
            'new_password1': 'password1',
            'new_password2': 'password1',
        })
        self.assertContainsEscaped(response, PasswordChangeForm.error_messages['password_incorrect'])

    def test_password_change_fails_with_mismatched_passwords(self):
        self.login()
        response = self.client.post('/password_change/', {
            'old_password': 'password',
            'new_password1': 'password1',
            'new_password2': 'donuts',
        })
        self.assertContainsEscaped(response, SetPasswordForm.error_messages['password_mismatch'])

    def test_password_change_succeeds(self):
        self.login()
        response = self.client.post('/password_change/', {
            'old_password': 'password',
            'new_password1': 'password1',
            'new_password2': 'password1',
        })
        self.assertEqual(response.status_code, 302)
        self.assertTrue(response['Location'].endswith('/password_change/done/'))
        self.fail_login()
        self.login(password='password1')

    def test_password_change_done_succeeds(self):
        self.login()
        response = self.client.post('/password_change/', {
            'old_password': 'password',
            'new_password1': 'password1',
            'new_password2': 'password1',
        })
        self.assertEqual(response.status_code, 302)
        self.assertTrue(response['Location'].endswith('/password_change/done/'))

    def test_password_change_done_fails(self):
        with self.settings(LOGIN_URL='/login/'):
            response = self.client.get('/password_change/done/')
            self.assertEqual(response.status_code, 302)
            self.assertTrue(response['Location'].endswith('/login/?next=/password_change/done/'))


@skipIfCustomUser
class LoginTest(AuthViewsTestCase):

    def test_current_site_in_context_after_login(self):
        response = self.client.get(reverse('django.contrib.auth.views.login'))
        self.assertEqual(response.status_code, 200)
        if Site._meta.installed:
            site = Site.objects.get_current()
            self.assertEqual(response.context['site'], site)
            self.assertEqual(response.context['site_name'], site.name)
        else:
            self.assertIsInstance(response.context['site'], RequestSite)
        self.assertTrue(isinstance(response.context['form'], AuthenticationForm),
                     'Login form is not an AuthenticationForm')

    def test_security_check(self, password='password'):
        login_url = reverse('django.contrib.auth.views.login')

        # Those URLs should not pass the security check
        for bad_url in ('http://example.com',
                        'https://example.com',
                        'ftp://exampel.com',
                        '//example.com'):

            nasty_url = '%(url)s?%(next)s=%(bad_url)s' % {
                'url': login_url,
                'next': REDIRECT_FIELD_NAME,
                'bad_url': urlquote(bad_url),
            }
            response = self.client.post(nasty_url, {
                'username': 'testclient',
                'password': password,
            })
            self.assertEqual(response.status_code, 302)
            self.assertFalse(bad_url in response['Location'],
                             "%s should be blocked" % bad_url)

        # These URLs *should* still pass the security check
        for good_url in ('/view/?param=http://example.com',
                         '/view/?param=https://example.com',
                         '/view?param=ftp://exampel.com',
                         'view/?param=//example.com',
                         'https:///',
                         '//testserver/',
                         '/url%20with%20spaces/'):  # see ticket #12534
            safe_url = '%(url)s?%(next)s=%(good_url)s' % {
                'url': login_url,
                'next': REDIRECT_FIELD_NAME,
                'good_url': urlquote(good_url),
            }
            response = self.client.post(safe_url, {
                    'username': 'testclient',
                    'password': password,
            })
            self.assertEqual(response.status_code, 302)
            self.assertTrue(good_url in response['Location'],
                            "%s should be allowed" % good_url)


@skipIfCustomUser
class LoginURLSettings(AuthViewsTestCase):

    def setUp(self):
        super(LoginURLSettings, self).setUp()
        self.old_LOGIN_URL = settings.LOGIN_URL

    def tearDown(self):
        super(LoginURLSettings, self).tearDown()
        settings.LOGIN_URL = self.old_LOGIN_URL

    def get_login_required_url(self, login_url):
        settings.LOGIN_URL = login_url
        response = self.client.get('/login_required/')
        self.assertEqual(response.status_code, 302)
        return response['Location']

    def test_standard_login_url(self):
        login_url = '/login/'
        login_required_url = self.get_login_required_url(login_url)
        querystring = QueryDict('', mutable=True)
        querystring['next'] = '/login_required/'
        self.assertEqual(login_required_url, 'http://testserver%s?%s' %
                         (login_url, querystring.urlencode('/')))

    def test_remote_login_url(self):
        login_url = 'http://remote.example.com/login'
        login_required_url = self.get_login_required_url(login_url)
        querystring = QueryDict('', mutable=True)
        querystring['next'] = 'http://testserver/login_required/'
        self.assertEqual(login_required_url,
                         '%s?%s' % (login_url, querystring.urlencode('/')))

    def test_https_login_url(self):
        login_url = 'https:///login/'
        login_required_url = self.get_login_required_url(login_url)
        querystring = QueryDict('', mutable=True)
        querystring['next'] = 'http://testserver/login_required/'
        self.assertEqual(login_required_url,
                         '%s?%s' % (login_url, querystring.urlencode('/')))

    def test_login_url_with_querystring(self):
        login_url = '/login/?pretty=1'
        login_required_url = self.get_login_required_url(login_url)
        querystring = QueryDict('pretty=1', mutable=True)
        querystring['next'] = '/login_required/'
        self.assertEqual(login_required_url, 'http://testserver/login/?%s' %
                         querystring.urlencode('/'))

    def test_remote_login_url_with_next_querystring(self):
        login_url = 'http://remote.example.com/login/'
        login_required_url = self.get_login_required_url('%s?next=/default/' %
                                                         login_url)
        querystring = QueryDict('', mutable=True)
        querystring['next'] = 'http://testserver/login_required/'
        self.assertEqual(login_required_url, '%s?%s' % (login_url,
                                                    querystring.urlencode('/')))


@skipIfCustomUser
class LogoutTest(AuthViewsTestCase):

    def confirm_logged_out(self):
        self.assertTrue(SESSION_KEY not in self.client.session)

    def test_logout_default(self):
        "Logout without next_page option renders the default template"
        self.login()
        response = self.client.get('/logout/')
        self.assertContains(response, 'Logged out')
        self.confirm_logged_out()

    def test_14377(self):
        # Bug 14377
        self.login()
        response = self.client.get('/logout/')
        self.assertTrue('site' in response.context)

    def test_logout_with_overridden_redirect_url(self):
        # Bug 11223
        self.login()
        response = self.client.get('/logout/next_page/')
        self.assertEqual(response.status_code, 302)
        self.assertTrue(response['Location'].endswith('/somewhere/'))

        response = self.client.get('/logout/next_page/?next=/login/')
        self.assertEqual(response.status_code, 302)
        self.assertTrue(response['Location'].endswith('/login/'))

        self.confirm_logged_out()

    def test_logout_with_next_page_specified(self):
        "Logout with next_page option given redirects to specified resource"
        self.login()
        response = self.client.get('/logout/next_page/')
        self.assertEqual(response.status_code, 302)
        self.assertTrue(response['Location'].endswith('/somewhere/'))
        self.confirm_logged_out()

    def test_logout_with_redirect_argument(self):
        "Logout with query string redirects to specified resource"
        self.login()
        response = self.client.get('/logout/?next=/login/')
        self.assertEqual(response.status_code, 302)
        self.assertTrue(response['Location'].endswith('/login/'))
        self.confirm_logged_out()

    def test_logout_with_custom_redirect_argument(self):
        "Logout with custom query string redirects to specified resource"
        self.login()
        response = self.client.get('/logout/custom_query/?follow=/somewhere/')
        self.assertEqual(response.status_code, 302)
        self.assertTrue(response['Location'].endswith('/somewhere/'))
        self.confirm_logged_out()

    def test_security_check(self, password='password'):
        logout_url = reverse('django.contrib.auth.views.logout')

        # Those URLs should not pass the security check
        for bad_url in ('http://example.com',
                        'https://example.com',
                        'ftp://exampel.com',
                        '//example.com'):
            nasty_url = '%(url)s?%(next)s=%(bad_url)s' % {
                'url': logout_url,
                'next': REDIRECT_FIELD_NAME,
                'bad_url': urlquote(bad_url),
            }
            self.login()
            response = self.client.get(nasty_url)
            self.assertEqual(response.status_code, 302)
            self.assertFalse(bad_url in response['Location'],
                             "%s should be blocked" % bad_url)
            self.confirm_logged_out()

        # These URLs *should* still pass the security check
        for good_url in ('/view/?param=http://example.com',
                         '/view/?param=https://example.com',
                         '/view?param=ftp://exampel.com',
                         'view/?param=//example.com',
                         'https:///',
                         '//testserver/',
                         '/url%20with%20spaces/'):  # see ticket #12534
            safe_url = '%(url)s?%(next)s=%(good_url)s' % {
                'url': logout_url,
                'next': REDIRECT_FIELD_NAME,
                'good_url': urlquote(good_url),
            }
            self.login()
            response = self.client.get(safe_url)
            self.assertEqual(response.status_code, 302)
            self.assertTrue(good_url in response['Location'],
                            "%s should be allowed" % good_url)
            self.confirm_logged_out()