# -*- coding: utf-8 -*-

# Copyright (C) 2010-2020 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/

import os
from hashlib import sha1

import pytest
from mock import patch

from rhodecode.lib import auth
from rhodecode.lib.utils2 import md5
from rhodecode.model.auth_token import AuthTokenModel
from rhodecode.model.db import Session, User
from rhodecode.model.repo import RepoModel
from rhodecode.model.user import UserModel
from rhodecode.model.user_group import UserGroupModel


def test_perm_origin_dict():
    pod = auth.PermOriginDict()
    pod['thing'] = 'read', 'default', 1
    assert pod['thing'] == 'read'

    assert pod.perm_origin_stack == {
        'thing': [('read', 'default', 1)]}

    pod['thing'] = 'write', 'admin', 1
    assert pod['thing'] == 'write'

    assert pod.perm_origin_stack == {
        'thing': [('read', 'default', 1), ('write', 'admin', 1)]}

    pod['other'] = 'write', 'default', 8

    assert pod.perm_origin_stack == {
        'other': [('write', 'default', 8)],
        'thing': [('read', 'default', 1), ('write', 'admin', 1)]}

    pod['other'] = 'none', 'override', 8

    assert pod.perm_origin_stack == {
        'other': [('write', 'default', 8), ('none', 'override', 8)],
        'thing': [('read', 'default', 1), ('write', 'admin', 1)]}

    with pytest.raises(ValueError):
        pod['thing'] = 'read'


def test_cached_perms_data(user_regular, backend_random):
    permissions = get_permissions(user_regular)
    repo_name = backend_random.repo.repo_name
    expected_global_permissions = {
        'repository.read', 'group.read', 'usergroup.read'}
    assert expected_global_permissions.issubset(permissions['global'])
    assert permissions['repositories'][repo_name] == 'repository.read'


def test_cached_perms_data_with_admin_user(user_regular, backend_random):
    permissions = get_permissions(user_regular, user_is_admin=True)
    repo_name = backend_random.repo.repo_name
    assert 'hg.admin' in permissions['global']
    assert permissions['repositories'][repo_name] == 'repository.admin'


def test_cached_perms_data_with_admin_user_extended_calculation(user_regular, backend_random):
    permissions = get_permissions(user_regular, user_is_admin=True,
                                  calculate_super_admin=True)
    repo_name = backend_random.repo.repo_name
    assert 'hg.admin' in permissions['global']
    assert permissions['repositories'][repo_name] == 'repository.admin'


def test_cached_perms_data_user_group_global_permissions(user_util):
    user, user_group = user_util.create_user_with_group()
    user_group.inherit_default_permissions = False

    granted_permission = 'repository.write'
    UserGroupModel().grant_perm(user_group, granted_permission)
    Session().commit()

    permissions = get_permissions(user)
    assert granted_permission in permissions['global']


@pytest.mark.xfail(reason="Not implemented, see TODO note")
def test_cached_perms_data_user_group_global_permissions_(user_util):
    user, user_group = user_util.create_user_with_group()

    granted_permission = 'repository.write'
    UserGroupModel().grant_perm(user_group, granted_permission)
    Session().commit()

    permissions = get_permissions(user)
    assert granted_permission in permissions['global']


def test_cached_perms_data_user_global_permissions(user_util):
    user = user_util.create_user()
    UserModel().grant_perm(user, 'repository.none')
    Session().commit()

    permissions = get_permissions(user, user_inherit_default_permissions=True)
    assert 'repository.read' in permissions['global']


def test_cached_perms_data_repository_permissions_on_private_repository(
        backend_random, user_util):
    user, user_group = user_util.create_user_with_group()

    repo = backend_random.create_repo()
    repo.private = True

    granted_permission = 'repository.write'
    RepoModel().grant_user_group_permission(
        repo, user_group.users_group_name, granted_permission)
    Session().commit()

    permissions = get_permissions(user)
    assert permissions['repositories'][repo.repo_name] == granted_permission


def test_cached_perms_data_repository_permissions_for_owner(
        backend_random, user_util):
    user = user_util.create_user()

    repo = backend_random.create_repo()
    repo.user_id = user.user_id

    permissions = get_permissions(user)
    assert permissions['repositories'][repo.repo_name] == 'repository.admin'

    # TODO: johbo: Make cleanup in UserUtility smarter, then remove this hack
    repo.user_id = User.get_default_user_id()


def test_cached_perms_data_repository_permissions_not_inheriting_defaults(
        backend_random, user_util):
    user = user_util.create_user()
    repo = backend_random.create_repo()

    # Don't inherit default object permissions
    UserModel().grant_perm(user, 'hg.inherit_default_perms.false')
    Session().commit()

    permissions = get_permissions(user)
    assert permissions['repositories'][repo.repo_name] == 'repository.none'


def test_cached_perms_data_default_permissions_on_repository_group(user_util):
    # Have a repository group with default permissions set
    repo_group = user_util.create_repo_group()
    default_user = User.get_default_user()
    user_util.grant_user_permission_to_repo_group(
        repo_group, default_user, 'repository.write')
    user = user_util.create_user()

    permissions = get_permissions(user)
    assert permissions['repositories_groups'][repo_group.group_name] == \
        'repository.write'


def test_cached_perms_data_default_permissions_on_repository_group_owner(
        user_util):
    # Have a repository group
    repo_group = user_util.create_repo_group()
    default_user = User.get_default_user()

    # Add a permission for the default user to hit the code path
    user_util.grant_user_permission_to_repo_group(
        repo_group, default_user, 'repository.write')

    # Have an owner of the group
    user = user_util.create_user()
    repo_group.user_id = user.user_id

    permissions = get_permissions(user)
    assert permissions['repositories_groups'][repo_group.group_name] == \
        'group.admin'


def test_cached_perms_data_default_permissions_on_repository_group_no_inherit(
        user_util):
    # Have a repository group
    repo_group = user_util.create_repo_group()
    default_user = User.get_default_user()

    # Add a permission for the default user to hit the code path
    user_util.grant_user_permission_to_repo_group(
        repo_group, default_user, 'repository.write')

    # Don't inherit default object permissions
    user = user_util.create_user()
    UserModel().grant_perm(user, 'hg.inherit_default_perms.false')
    Session().commit()

    permissions = get_permissions(user)
    assert permissions['repositories_groups'][repo_group.group_name] == \
        'group.none'


def test_cached_perms_data_repository_permissions_from_user_group(
        user_util, backend_random):
    user, user_group = user_util.create_user_with_group()

    # Needs a second user group to make sure that we select the right
    # permissions.
    user_group2 = user_util.create_user_group()
    UserGroupModel().add_user_to_group(user_group2, user)

    repo = backend_random.create_repo()

    RepoModel().grant_user_group_permission(
        repo, user_group.users_group_name, 'repository.read')
    RepoModel().grant_user_group_permission(
        repo, user_group2.users_group_name, 'repository.write')
    Session().commit()

    permissions = get_permissions(user)
    assert permissions['repositories'][repo.repo_name] == 'repository.write'


def test_cached_perms_data_repository_permissions_from_user_group_owner(
        user_util, backend_random):
    user, user_group = user_util.create_user_with_group()

    repo = backend_random.create_repo()
    repo.user_id = user.user_id

    RepoModel().grant_user_group_permission(
        repo, user_group.users_group_name, 'repository.write')
    Session().commit()

    permissions = get_permissions(user)
    assert permissions['repositories'][repo.repo_name] == 'repository.admin'


def test_cached_perms_data_user_repository_permissions(
        user_util, backend_random):
    user = user_util.create_user()
    repo = backend_random.create_repo()
    granted_permission = 'repository.write'
    RepoModel().grant_user_permission(repo, user, granted_permission)
    Session().commit()

    permissions = get_permissions(user)
    assert permissions['repositories'][repo.repo_name] == granted_permission


def test_cached_perms_data_user_repository_permissions_explicit(
        user_util, backend_random):
    user = user_util.create_user()
    repo = backend_random.create_repo()
    granted_permission = 'repository.none'
    RepoModel().grant_user_permission(repo, user, granted_permission)
    Session().commit()

    permissions = get_permissions(user, explicit=True)
    assert permissions['repositories'][repo.repo_name] == granted_permission


def test_cached_perms_data_user_repository_permissions_owner(
        user_util, backend_random):
    user = user_util.create_user()
    repo = backend_random.create_repo()
    repo.user_id = user.user_id
    RepoModel().grant_user_permission(repo, user, 'repository.write')
    Session().commit()

    permissions = get_permissions(user)
    assert permissions['repositories'][repo.repo_name] == 'repository.admin'


def test_cached_perms_data_repository_groups_permissions_inherited(
        user_util, backend_random):
    user, user_group = user_util.create_user_with_group()

    # Needs a second group to hit the last condition
    user_group2 = user_util.create_user_group()
    UserGroupModel().add_user_to_group(user_group2, user)

    repo_group = user_util.create_repo_group()

    user_util.grant_user_group_permission_to_repo_group(
        repo_group, user_group, 'group.read')
    user_util.grant_user_group_permission_to_repo_group(
        repo_group, user_group2, 'group.write')

    permissions = get_permissions(user)
    assert permissions['repositories_groups'][repo_group.group_name] == \
        'group.write'


def test_cached_perms_data_repository_groups_permissions_inherited_owner(
        user_util, backend_random):
    user, user_group = user_util.create_user_with_group()
    repo_group = user_util.create_repo_group()
    repo_group.user_id = user.user_id

    granted_permission = 'group.write'
    user_util.grant_user_group_permission_to_repo_group(
        repo_group, user_group, granted_permission)

    permissions = get_permissions(user)
    assert permissions['repositories_groups'][repo_group.group_name] == \
        'group.admin'


def test_cached_perms_data_repository_groups_permissions(
        user_util, backend_random):
    user = user_util.create_user()

    repo_group = user_util.create_repo_group()

    granted_permission = 'group.write'
    user_util.grant_user_permission_to_repo_group(
        repo_group, user, granted_permission)

    permissions = get_permissions(user)
    assert permissions['repositories_groups'][repo_group.group_name] == \
        'group.write'


def test_cached_perms_data_repository_groups_permissions_explicit(
        user_util, backend_random):
    user = user_util.create_user()

    repo_group = user_util.create_repo_group()

    granted_permission = 'group.none'
    user_util.grant_user_permission_to_repo_group(
        repo_group, user, granted_permission)

    permissions = get_permissions(user, explicit=True)
    assert permissions['repositories_groups'][repo_group.group_name] == \
        'group.none'


def test_cached_perms_data_repository_groups_permissions_owner(
        user_util, backend_random):
    user = user_util.create_user()

    repo_group = user_util.create_repo_group()
    repo_group.user_id = user.user_id

    granted_permission = 'group.write'
    user_util.grant_user_permission_to_repo_group(
        repo_group, user, granted_permission)

    permissions = get_permissions(user)
    assert permissions['repositories_groups'][repo_group.group_name] == \
        'group.admin'


def test_cached_perms_data_user_group_permissions_inherited(
        user_util, backend_random):
    user, user_group = user_util.create_user_with_group()
    user_group2 = user_util.create_user_group()
    UserGroupModel().add_user_to_group(user_group2, user)

    target_user_group = user_util.create_user_group()

    user_util.grant_user_group_permission_to_user_group(
        target_user_group, user_group, 'usergroup.read')
    user_util.grant_user_group_permission_to_user_group(
        target_user_group, user_group2, 'usergroup.write')

    permissions = get_permissions(user)
    assert permissions['user_groups'][target_user_group.users_group_name] == \
        'usergroup.write'


def test_cached_perms_data_user_group_permissions(
        user_util, backend_random):
    user = user_util.create_user()
    user_group = user_util.create_user_group()
    UserGroupModel().grant_user_permission(user_group, user, 'usergroup.write')
    Session().commit()

    permissions = get_permissions(user)
    assert permissions['user_groups'][user_group.users_group_name] == \
        'usergroup.write'


def test_cached_perms_data_user_group_permissions_explicit(
        user_util, backend_random):
    user = user_util.create_user()
    user_group = user_util.create_user_group()
    UserGroupModel().grant_user_permission(user_group, user, 'usergroup.none')
    Session().commit()

    permissions = get_permissions(user, explicit=True)
    assert permissions['user_groups'][user_group.users_group_name] == \
        'usergroup.none'


def test_cached_perms_data_user_group_permissions_not_inheriting_defaults(
        user_util, backend_random):
    user = user_util.create_user()
    user_group = user_util.create_user_group()

    # Don't inherit default object permissions
    UserModel().grant_perm(user, 'hg.inherit_default_perms.false')
    Session().commit()

    permissions = get_permissions(user)
    assert permissions['user_groups'][user_group.users_group_name] == \
        'usergroup.none'


def test_permission_calculator_admin_permissions(
        user_util, backend_random):
    user = user_util.create_user()
    user_group = user_util.create_user_group()
    repo = backend_random.repo
    repo_group = user_util.create_repo_group()

    calculator = auth.PermissionCalculator(
        user.user_id, {}, False, False, True, 'higherwin')
    permissions = calculator._calculate_super_admin_permissions()

    assert permissions['repositories_groups'][repo_group.group_name] == \
        'group.admin'
    assert permissions['user_groups'][user_group.users_group_name] == \
        'usergroup.admin'
    assert permissions['repositories'][repo.repo_name] == 'repository.admin'
    assert 'hg.admin' in permissions['global']


def test_permission_calculator_repository_permissions_robustness_from_group(
        user_util, backend_random):
    user, user_group = user_util.create_user_with_group()

    RepoModel().grant_user_group_permission(
        backend_random.repo, user_group.users_group_name, 'repository.write')

    calculator = auth.PermissionCalculator(
        user.user_id, {}, False, False, False, 'higherwin')
    calculator._calculate_repository_permissions()


def test_permission_calculator_repository_permissions_robustness_from_user(
        user_util, backend_random):
    user = user_util.create_user()

    RepoModel().grant_user_permission(
        backend_random.repo, user, 'repository.write')
    Session().commit()

    calculator = auth.PermissionCalculator(
        user.user_id, {}, False, False, False, 'higherwin')
    calculator._calculate_repository_permissions()


def test_permission_calculator_repo_group_permissions_robustness_from_group(
        user_util, backend_random):
    user, user_group = user_util.create_user_with_group()
    repo_group = user_util.create_repo_group()

    user_util.grant_user_group_permission_to_repo_group(
        repo_group, user_group, 'group.write')

    calculator = auth.PermissionCalculator(
        user.user_id, {}, False, False, False, 'higherwin')
    calculator._calculate_repository_group_permissions()


def test_permission_calculator_repo_group_permissions_robustness_from_user(
        user_util, backend_random):
    user = user_util.create_user()
    repo_group = user_util.create_repo_group()

    user_util.grant_user_permission_to_repo_group(
        repo_group, user, 'group.write')

    calculator = auth.PermissionCalculator(
        user.user_id, {}, False, False, False, 'higherwin')
    calculator._calculate_repository_group_permissions()


def test_permission_calculator_user_group_permissions_robustness_from_group(
        user_util, backend_random):
    user, user_group = user_util.create_user_with_group()
    target_user_group = user_util.create_user_group()

    user_util.grant_user_group_permission_to_user_group(
        target_user_group, user_group, 'usergroup.write')

    calculator = auth.PermissionCalculator(
        user.user_id, {}, False, False, False, 'higherwin')
    calculator._calculate_user_group_permissions()


def test_permission_calculator_user_group_permissions_robustness_from_user(
        user_util, backend_random):
    user = user_util.create_user()
    target_user_group = user_util.create_user_group()

    user_util.grant_user_permission_to_user_group(
        target_user_group, user, 'usergroup.write')

    calculator = auth.PermissionCalculator(
        user.user_id, {}, False, False, False, 'higherwin')
    calculator._calculate_user_group_permissions()


@pytest.mark.parametrize("algo, new_permission, old_permission, expected", [
    ('higherwin', 'repository.none', 'repository.none', 'repository.none'),
    ('higherwin', 'repository.read', 'repository.none', 'repository.read'),
    ('lowerwin', 'repository.write', 'repository.write', 'repository.write'),
    ('lowerwin', 'repository.read', 'repository.write', 'repository.read'),
])
def test_permission_calculator_choose_permission(
        user_regular, algo, new_permission, old_permission, expected):
    calculator = auth.PermissionCalculator(
        user_regular.user_id, {}, False, False, False, algo)
    result = calculator._choose_permission(new_permission, old_permission)
    assert result == expected


def test_permission_calculator_choose_permission_raises_on_wrong_algo(
        user_regular):
    calculator = auth.PermissionCalculator(
        user_regular.user_id, {}, False, False, False, 'invalid')
    result = calculator._choose_permission(
        'repository.read', 'repository.read')
    # TODO: johbo: This documents the existing behavior. Think of an
    # improvement.
    assert result is None


def test_auth_user_get_cookie_store_for_normal_user(user_util):
    user = user_util.create_user()
    auth_user = auth.AuthUser(user_id=user.user_id)
    expected_data = {
        'username': user.username,
        'user_id': user.user_id,
        'password': md5(user.password),
        'is_authenticated': False
    }
    assert auth_user.get_cookie_store() == expected_data


def test_auth_user_get_cookie_store_for_default_user():
    default_user = User.get_default_user()
    auth_user = auth.AuthUser()
    expected_data = {
        'username': User.DEFAULT_USER,
        'user_id': default_user.user_id,
        'password': md5(default_user.password),
        'is_authenticated': True
    }
    assert auth_user.get_cookie_store() == expected_data


def get_permissions(user, **kwargs):
    """
    Utility filling in useful defaults into the call to `_cached_perms_data`.

    Fill in `**kwargs` if specific values are needed for a test.
    """
    call_args = {
        'user_id': user.user_id,
        'scope': {},
        'user_is_admin': False,
        'user_inherit_default_permissions': False,
        'explicit': False,
        'algo': 'higherwin',
        'calculate_super_admin': False,
    }
    call_args.update(kwargs)
    permissions = auth._cached_perms_data(**call_args)
    return permissions


class TestGenerateAuthToken(object):
    def test_salt_is_used_when_specified(self):
        salt = 'abcde'
        user_name = 'test_user'
        result = auth.generate_auth_token(user_name, salt)
        expected_result = sha1(user_name + salt).hexdigest()
        assert result == expected_result

    def test_salt_is_geneated_when_not_specified(self):
        user_name = 'test_user'
        random_salt = os.urandom(16)
        with patch.object(auth, 'os') as os_mock:
            os_mock.urandom.return_value = random_salt
            result = auth.generate_auth_token(user_name)
        expected_result = sha1(user_name + random_salt).hexdigest()
        assert result == expected_result


@pytest.mark.parametrize("test_token, test_roles, auth_result, expected_tokens", [
    ('', None, False,
     []),
    ('wrongtoken', None, False,
     []),
    ('abracadabra_vcs', [AuthTokenModel.cls.ROLE_API], False,
     [('abracadabra_api', AuthTokenModel.cls.ROLE_API, -1)]),
    ('abracadabra_api', [AuthTokenModel.cls.ROLE_API], True,
     [('abracadabra_api', AuthTokenModel.cls.ROLE_API, -1)]),
    ('abracadabra_api', [AuthTokenModel.cls.ROLE_API], True,
     [('abracadabra_api', AuthTokenModel.cls.ROLE_API, -1),
      ('abracadabra_http', AuthTokenModel.cls.ROLE_HTTP, -1)]),
])
def test_auth_by_token(test_token, test_roles, auth_result, expected_tokens,
                       user_util):
    user = user_util.create_user()
    user_id = user.user_id
    for token, role, expires in expected_tokens:
        new_token = AuthTokenModel().create(user_id, u'test-token', expires, role)
        new_token.api_key = token  # inject known name for testing...

    assert auth_result == user.authenticate_by_token(
        test_token, roles=test_roles)