# This file is part of Radicale Server - Calendar Server
# Copyright © 2012-2016 Jean-Marc Martins
# Copyright © 2012-2017 Guillaume Ayoub
# Copyright © 2017-2019 Unrud <unrud@outlook.com>
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This library 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 General Public License
# along with Radicale.  If not, see <http://www.gnu.org/licenses/>.

"""
Radicale tests with simple requests and authentication.

"""

import base64
import os
import shutil
import tempfile

import pytest

from radicale import Application, config
from radicale.tests.test_base import BaseTest


class TestBaseAuthRequests(BaseTest):
    """Tests basic requests with auth.

    We should setup auth for each type before creating the Application object.

    """
    def setup(self):
        self.configuration = config.load()
        self.colpath = tempfile.mkdtemp()
        self.configuration.update({
            "storage": {"filesystem_folder": self.colpath},
            # Disable syncing to disk for better performance
            "internal": {"filesystem_fsync": "False"},
            # Set incorrect authentication delay to a very low value
            "auth": {"delay": "0.002"}}, "test", internal=True)

    def teardown(self):
        shutil.rmtree(self.colpath)

    def _test_htpasswd(self, htpasswd_encryption, htpasswd_content,
                       test_matrix="ascii"):
        """Test htpasswd authentication with user "tmp" and password "bepo" for
           ``test_matrix`` "ascii" or user "😀" and password "🔑" for
           ``test_matrix`` "unicode"."""
        if htpasswd_encryption == "bcrypt":
            try:
                from passlib.hash import bcrypt
                from passlib.exc import MissingBackendError
            except ImportError:
                pytest.skip("passlib[bcrypt] is not installed")
            try:
                bcrypt.hash("test-bcrypt-backend")
            except MissingBackendError:
                pytest.skip("bcrypt backend for passlib is not installed")
        htpasswd_file_path = os.path.join(self.colpath, ".htpasswd")
        encoding = self.configuration.get("encoding", "stock")
        with open(htpasswd_file_path, "w", encoding=encoding) as f:
            f.write(htpasswd_content)
        self.configuration.update({
            "auth": {"type": "htpasswd",
                     "htpasswd_filename": htpasswd_file_path,
                     "htpasswd_encryption": htpasswd_encryption}}, "test")
        self.application = Application(self.configuration)
        if test_matrix == "ascii":
            test_matrix = (("tmp", "bepo", True), ("tmp", "tmp", False),
                           ("tmp", "", False), ("unk", "unk", False),
                           ("unk", "", False), ("", "", False))
        elif test_matrix == "unicode":
            test_matrix = (("😀", "🔑", True), ("😀", "🌹", False),
                           ("😁", "🔑", False), ("😀", "", False),
                           ("", "🔑", False), ("", "", False))
        for user, password, valid in test_matrix:
            status, _, _ = self.request(
                "PROPFIND", "/",
                HTTP_AUTHORIZATION="Basic %s" % base64.b64encode(
                    ("%s:%s" % (user, password)).encode()).decode())
            assert status == (207 if valid else 401)

    def test_htpasswd_plain(self):
        self._test_htpasswd("plain", "tmp:bepo")

    def test_htpasswd_plain_password_split(self):
        self._test_htpasswd("plain", "tmp:be:po", (
            ("tmp", "be:po", True), ("tmp", "bepo", False)))

    def test_htpasswd_plain_unicode(self):
        self._test_htpasswd("plain", "😀:🔑", "unicode")

    def test_htpasswd_md5(self):
        self._test_htpasswd("md5", "tmp:$apr1$BI7VKCZh$GKW4vq2hqDINMr8uv7lDY/")

    def test_htpasswd_md5_unicode(self):
        self._test_htpasswd(
            "md5", "😀:$apr1$w4ev89r1$29xO8EvJmS2HEAadQ5qy11", "unicode")

    def test_htpasswd_bcrypt(self):
        self._test_htpasswd("bcrypt", "tmp:$2y$05$oD7hbiQFQlvCM7zoalo/T.MssV3V"
                            "NTRI3w5KDnj8NTUKJNWfVpvRq")

    def test_htpasswd_bcrypt_unicode(self):
        self._test_htpasswd("bcrypt", "😀:$2y$10$Oyz5aHV4MD9eQJbk6GPemOs4T6edK"
                            "6U9Sqlzr.W1mMVCS8wJUftnW", "unicode")

    def test_htpasswd_multi(self):
        self._test_htpasswd("plain", "ign:ign\ntmp:bepo")

    @pytest.mark.skipif(os.name == "nt", reason="leading and trailing "
                        "whitespaces not allowed in file names")
    def test_htpasswd_whitespace_user(self):
        for user in (" tmp", "tmp ", " tmp "):
            self._test_htpasswd("plain", "%s:bepo" % user, (
                (user, "bepo", True), ("tmp", "bepo", False)))

    def test_htpasswd_whitespace_password(self):
        for password in (" bepo", "bepo ", " bepo "):
            self._test_htpasswd("plain", "tmp:%s" % password, (
                ("tmp", password, True), ("tmp", "bepo", False)))

    def test_htpasswd_comment(self):
        self._test_htpasswd("plain", "#comment\n #comment\n \ntmp:bepo\n\n")

    def test_remote_user(self):
        self.configuration.update({"auth": {"type": "remote_user"}}, "test")
        self.application = Application(self.configuration)
        status, _, answer = self.request(
            "PROPFIND", "/",
            """<?xml version="1.0" encoding="utf-8"?>
               <propfind xmlns="DAV:">
                 <prop>
                   <current-user-principal />
                 </prop>
               </propfind>""", REMOTE_USER="test")
        assert status == 207
        assert ">/test/<" in answer

    def test_http_x_remote_user(self):
        self.configuration.update(
            {"auth": {"type": "http_x_remote_user"}}, "test")
        self.application = Application(self.configuration)
        status, _, answer = self.request(
            "PROPFIND", "/",
            """<?xml version="1.0" encoding="utf-8"?>
               <propfind xmlns="DAV:">
                 <prop>
                   <current-user-principal />
                 </prop>
               </propfind>""", HTTP_X_REMOTE_USER="test")
        assert status == 207
        assert ">/test/<" in answer

    def test_custom(self):
        """Custom authentication."""
        self.configuration.update(
            {"auth": {"type": "radicale.tests.custom.auth"}}, "test")
        self.application = Application(self.configuration)
        status, _, _ = self.request(
            "PROPFIND", "/tmp", HTTP_AUTHORIZATION="Basic %s" %
            base64.b64encode(("tmp:").encode()).decode())
        assert status == 207