# Copyright 2021 Callum Brown
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import random
import string
from typing import Optional

from twisted.test.proto_helpers import MemoryReactor

import synapse.rest.admin
from synapse.api.errors import Codes
from synapse.rest.client import login
from synapse.server import HomeServer
from synapse.util import Clock

from tests import unittest


class ManageRegistrationTokensTestCase(unittest.HomeserverTestCase):
    servlets = [
        synapse.rest.admin.register_servlets,
        login.register_servlets,
    ]

    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
        self.store = hs.get_datastores().main
        self.admin_user = self.register_user("admin", "pass", admin=True)
        self.admin_user_tok = self.login("admin", "pass")

        self.other_user = self.register_user("user", "pass")
        self.other_user_tok = self.login("user", "pass")

        self.url = "/_synapse/admin/v1/registration_tokens"

    def _new_token(
        self,
        token: Optional[str] = None,
        uses_allowed: Optional[int] = None,
        pending: int = 0,
        completed: int = 0,
        expiry_time: Optional[int] = None,
    ) -> str:
        """Helper function to create a token."""
        if token is None:
            token = "".join(random.choices(string.ascii_letters, k=8))

        self.get_success(
            self.store.db_pool.simple_insert(
                "registration_tokens",
                {
                    "token": token,
                    "uses_allowed": uses_allowed,
                    "pending": pending,
                    "completed": completed,
                    "expiry_time": expiry_time,
                },
            )
        )
        return token

    # CREATION

    def test_create_no_auth(self) -> None:
        """Try to create a token without authentication."""
        channel = self.make_request("POST", self.url + "/new", {})
        self.assertEqual(401, channel.code, msg=channel.json_body)
        self.assertEqual(Codes.MISSING_TOKEN, channel.json_body["errcode"])

    def test_create_requester_not_admin(self) -> None:
        """Try to create a token while not an admin."""
        channel = self.make_request(
            "POST",
            self.url + "/new",
            {},
            access_token=self.other_user_tok,
        )
        self.assertEqual(403, channel.code, msg=channel.json_body)
        self.assertEqual(Codes.FORBIDDEN, channel.json_body["errcode"])

    def test_create_using_defaults(self) -> None:
        """Create a token using all the defaults."""
        channel = self.make_request(
            "POST",
            self.url + "/new",
            {},
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(len(channel.json_body["token"]), 16)
        self.assertIsNone(channel.json_body["uses_allowed"])
        self.assertIsNone(channel.json_body["expiry_time"])
        self.assertEqual(channel.json_body["pending"], 0)
        self.assertEqual(channel.json_body["completed"], 0)

    def test_create_specifying_fields(self) -> None:
        """Create a token specifying the value of all fields."""
        # As many of the allowed characters as possible with length <= 64
        token = "adefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789._~-"
        data = {
            "token": token,
            "uses_allowed": 1,
            "expiry_time": self.clock.time_msec() + 1000000,
        }

        channel = self.make_request(
            "POST",
            self.url + "/new",
            data,
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["token"], token)
        self.assertEqual(channel.json_body["uses_allowed"], 1)
        self.assertEqual(channel.json_body["expiry_time"], data["expiry_time"])
        self.assertEqual(channel.json_body["pending"], 0)
        self.assertEqual(channel.json_body["completed"], 0)

    def test_create_with_null_value(self) -> None:
        """Create a token specifying unlimited uses and no expiry."""
        data = {
            "uses_allowed": None,
            "expiry_time": None,
        }

        channel = self.make_request(
            "POST",
            self.url + "/new",
            data,
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(len(channel.json_body["token"]), 16)
        self.assertIsNone(channel.json_body["uses_allowed"])
        self.assertIsNone(channel.json_body["expiry_time"])
        self.assertEqual(channel.json_body["pending"], 0)
        self.assertEqual(channel.json_body["completed"], 0)

    def test_create_token_too_long(self) -> None:
        """Check token longer than 64 chars is invalid."""
        data = {"token": "a" * 65}

        channel = self.make_request(
            "POST",
            self.url + "/new",
            data,
            access_token=self.admin_user_tok,
        )

        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

    def test_create_token_invalid_chars(self) -> None:
        """Check you can't create token with invalid characters."""
        data = {
            "token": "abc/def",
        }

        channel = self.make_request(
            "POST",
            self.url + "/new",
            data,
            access_token=self.admin_user_tok,
        )

        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

    def test_create_token_already_exists(self) -> None:
        """Check you can't create token that already exists."""
        data = {
            "token": "abcd",
        }

        channel1 = self.make_request(
            "POST",
            self.url + "/new",
            data,
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, channel1.code, msg=channel1.json_body)

        channel2 = self.make_request(
            "POST",
            self.url + "/new",
            data,
            access_token=self.admin_user_tok,
        )
        self.assertEqual(400, channel2.code, msg=channel2.json_body)
        self.assertEqual(channel2.json_body["errcode"], Codes.INVALID_PARAM)

    def test_create_unable_to_generate_token(self) -> None:
        """Check right error is raised when server can't generate unique token."""
        # Create all possible single character tokens
        tokens = []
        for c in string.ascii_letters + string.digits + "._~-":
            tokens.append((c, None, 0, 0, None))
        self.get_success(
            self.store.db_pool.simple_insert_many(
                "registration_tokens",
                keys=("token", "uses_allowed", "pending", "completed", "expiry_time"),
                values=tokens,
                desc="create_all_registration_tokens",
            )
        )

        # Check creating a single character token fails with a 500 status code
        channel = self.make_request(
            "POST",
            self.url + "/new",
            {"length": 1},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(500, channel.code, msg=channel.json_body)

    def test_create_uses_allowed(self) -> None:
        """Check you can only create a token with good values for uses_allowed."""
        # Should work with 0 (token is invalid from the start)
        channel = self.make_request(
            "POST",
            self.url + "/new",
            {"uses_allowed": 0},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["uses_allowed"], 0)

        # Should fail with negative integer
        channel = self.make_request(
            "POST",
            self.url + "/new",
            {"uses_allowed": -5},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(
            400,
            channel.code,
            msg=channel.json_body,
        )
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

        # Should fail with float
        channel = self.make_request(
            "POST",
            self.url + "/new",
            {"uses_allowed": 1.5},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

    def test_create_expiry_time(self) -> None:
        """Check you can't create a token with an invalid expiry_time."""
        # Should fail with a time in the past
        channel = self.make_request(
            "POST",
            self.url + "/new",
            {"expiry_time": self.clock.time_msec() - 10000},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

        # Should fail with float
        channel = self.make_request(
            "POST",
            self.url + "/new",
            {"expiry_time": self.clock.time_msec() + 1000000.5},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

    def test_create_length(self) -> None:
        """Check you can only generate a token with a valid length."""
        # Should work with 64
        channel = self.make_request(
            "POST",
            self.url + "/new",
            {"length": 64},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(len(channel.json_body["token"]), 64)

        # Should fail with 0
        channel = self.make_request(
            "POST",
            self.url + "/new",
            {"length": 0},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

        # Should fail with a negative integer
        channel = self.make_request(
            "POST",
            self.url + "/new",
            {"length": -5},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

        # Should fail with a float
        channel = self.make_request(
            "POST",
            self.url + "/new",
            {"length": 8.5},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

        # Should fail with 65
        channel = self.make_request(
            "POST",
            self.url + "/new",
            {"length": 65},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

    # UPDATING

    def test_update_no_auth(self) -> None:
        """Try to update a token without authentication."""
        channel = self.make_request(
            "PUT",
            self.url + "/1234",  # Token doesn't exist but that doesn't matter
            {},
        )
        self.assertEqual(401, channel.code, msg=channel.json_body)
        self.assertEqual(Codes.MISSING_TOKEN, channel.json_body["errcode"])

    def test_update_requester_not_admin(self) -> None:
        """Try to update a token while not an admin."""
        channel = self.make_request(
            "PUT",
            self.url + "/1234",  # Token doesn't exist but that doesn't matter
            {},
            access_token=self.other_user_tok,
        )
        self.assertEqual(403, channel.code, msg=channel.json_body)
        self.assertEqual(Codes.FORBIDDEN, channel.json_body["errcode"])

    def test_update_non_existent(self) -> None:
        """Try to update a token that doesn't exist."""
        channel = self.make_request(
            "PUT",
            self.url + "/1234",
            {"uses_allowed": 1},
            access_token=self.admin_user_tok,
        )

        self.assertEqual(404, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.NOT_FOUND)

    def test_update_uses_allowed(self) -> None:
        """Test updating just uses_allowed."""
        # Create new token using default values
        token = self._new_token()

        # Should succeed with 1
        channel = self.make_request(
            "PUT",
            self.url + "/" + token,
            {"uses_allowed": 1},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["uses_allowed"], 1)
        self.assertIsNone(channel.json_body["expiry_time"])

        # Should succeed with 0 (makes token invalid)
        channel = self.make_request(
            "PUT",
            self.url + "/" + token,
            {"uses_allowed": 0},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["uses_allowed"], 0)
        self.assertIsNone(channel.json_body["expiry_time"])

        # Should succeed with null
        channel = self.make_request(
            "PUT",
            self.url + "/" + token,
            {"uses_allowed": None},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertIsNone(channel.json_body["uses_allowed"])
        self.assertIsNone(channel.json_body["expiry_time"])

        # Should fail with a float
        channel = self.make_request(
            "PUT",
            self.url + "/" + token,
            {"uses_allowed": 1.5},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

        # Should fail with a negative integer
        channel = self.make_request(
            "PUT",
            self.url + "/" + token,
            {"uses_allowed": -5},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

    def test_update_expiry_time(self) -> None:
        """Test updating just expiry_time."""
        # Create new token using default values
        token = self._new_token()
        new_expiry_time = self.clock.time_msec() + 1000000

        # Should succeed with a time in the future
        channel = self.make_request(
            "PUT",
            self.url + "/" + token,
            {"expiry_time": new_expiry_time},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["expiry_time"], new_expiry_time)
        self.assertIsNone(channel.json_body["uses_allowed"])

        # Should succeed with null
        channel = self.make_request(
            "PUT",
            self.url + "/" + token,
            {"expiry_time": None},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertIsNone(channel.json_body["expiry_time"])
        self.assertIsNone(channel.json_body["uses_allowed"])

        # Should fail with a time in the past
        past_time = self.clock.time_msec() - 10000
        channel = self.make_request(
            "PUT",
            self.url + "/" + token,
            {"expiry_time": past_time},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

        # Should fail a float
        channel = self.make_request(
            "PUT",
            self.url + "/" + token,
            {"expiry_time": new_expiry_time + 0.5},
            access_token=self.admin_user_tok,
        )
        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

    def test_update_both(self) -> None:
        """Test updating both uses_allowed and expiry_time."""
        # Create new token using default values
        token = self._new_token()
        new_expiry_time = self.clock.time_msec() + 1000000

        data = {
            "uses_allowed": 1,
            "expiry_time": new_expiry_time,
        }

        channel = self.make_request(
            "PUT",
            self.url + "/" + token,
            data,
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["uses_allowed"], 1)
        self.assertEqual(channel.json_body["expiry_time"], new_expiry_time)

    def test_update_invalid_type(self) -> None:
        """Test using invalid types doesn't work."""
        # Create new token using default values
        token = self._new_token()

        data = {
            "uses_allowed": False,
            "expiry_time": "1626430124000",
        }

        channel = self.make_request(
            "PUT",
            self.url + "/" + token,
            data,
            access_token=self.admin_user_tok,
        )

        self.assertEqual(400, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.INVALID_PARAM)

    # DELETING

    def test_delete_no_auth(self) -> None:
        """Try to delete a token without authentication."""
        channel = self.make_request(
            "DELETE",
            self.url + "/1234",  # Token doesn't exist but that doesn't matter
            {},
        )
        self.assertEqual(401, channel.code, msg=channel.json_body)
        self.assertEqual(Codes.MISSING_TOKEN, channel.json_body["errcode"])

    def test_delete_requester_not_admin(self) -> None:
        """Try to delete a token while not an admin."""
        channel = self.make_request(
            "DELETE",
            self.url + "/1234",  # Token doesn't exist but that doesn't matter
            {},
            access_token=self.other_user_tok,
        )
        self.assertEqual(403, channel.code, msg=channel.json_body)
        self.assertEqual(Codes.FORBIDDEN, channel.json_body["errcode"])

    def test_delete_non_existent(self) -> None:
        """Try to delete a token that doesn't exist."""
        channel = self.make_request(
            "DELETE",
            self.url + "/1234",
            {},
            access_token=self.admin_user_tok,
        )

        self.assertEqual(404, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.NOT_FOUND)

    def test_delete(self) -> None:
        """Test deleting a token."""
        # Create new token using default values
        token = self._new_token()

        channel = self.make_request(
            "DELETE",
            self.url + "/" + token,
            {},
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, channel.code, msg=channel.json_body)

    # GETTING ONE

    def test_get_no_auth(self) -> None:
        """Try to get a token without authentication."""
        channel = self.make_request(
            "GET",
            self.url + "/1234",  # Token doesn't exist but that doesn't matter
            {},
        )
        self.assertEqual(401, channel.code, msg=channel.json_body)
        self.assertEqual(Codes.MISSING_TOKEN, channel.json_body["errcode"])

    def test_get_requester_not_admin(self) -> None:
        """Try to get a token while not an admin."""
        channel = self.make_request(
            "GET",
            self.url + "/1234",  # Token doesn't exist but that doesn't matter
            {},
            access_token=self.other_user_tok,
        )
        self.assertEqual(
            403,
            channel.code,
            msg=channel.json_body,
        )
        self.assertEqual(Codes.FORBIDDEN, channel.json_body["errcode"])

    def test_get_non_existent(self) -> None:
        """Try to get a token that doesn't exist."""
        channel = self.make_request(
            "GET",
            self.url + "/1234",
            {},
            access_token=self.admin_user_tok,
        )

        self.assertEqual(404, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["errcode"], Codes.NOT_FOUND)

    def test_get(self) -> None:
        """Test getting a token."""
        # Create new token using default values
        token = self._new_token()

        channel = self.make_request(
            "GET",
            self.url + "/" + token,
            {},
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["token"], token)
        self.assertIsNone(channel.json_body["uses_allowed"])
        self.assertIsNone(channel.json_body["expiry_time"])
        self.assertEqual(channel.json_body["pending"], 0)
        self.assertEqual(channel.json_body["completed"], 0)

    # LISTING

    def test_list_no_auth(self) -> None:
        """Try to list tokens without authentication."""
        channel = self.make_request("GET", self.url, {})
        self.assertEqual(401, channel.code, msg=channel.json_body)
        self.assertEqual(Codes.MISSING_TOKEN, channel.json_body["errcode"])

    def test_list_requester_not_admin(self) -> None:
        """Try to list tokens while not an admin."""
        channel = self.make_request(
            "GET",
            self.url,
            {},
            access_token=self.other_user_tok,
        )
        self.assertEqual(403, channel.code, msg=channel.json_body)
        self.assertEqual(Codes.FORBIDDEN, channel.json_body["errcode"])

    def test_list_all(self) -> None:
        """Test listing all tokens."""
        # Create new token using default values
        token = self._new_token()

        channel = self.make_request(
            "GET",
            self.url,
            {},
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(len(channel.json_body["registration_tokens"]), 1)
        token_info = channel.json_body["registration_tokens"][0]
        self.assertEqual(token_info["token"], token)
        self.assertIsNone(token_info["uses_allowed"])
        self.assertIsNone(token_info["expiry_time"])
        self.assertEqual(token_info["pending"], 0)
        self.assertEqual(token_info["completed"], 0)

    def test_list_invalid_query_parameter(self) -> None:
        """Test with `valid` query parameter not `true` or `false`."""
        channel = self.make_request(
            "GET",
            self.url + "?valid=x",
            {},
            access_token=self.admin_user_tok,
        )

        self.assertEqual(400, channel.code, msg=channel.json_body)

    def _test_list_query_parameter(self, valid: str) -> None:
        """Helper used to test both valid=true and valid=false."""
        # Create 2 valid and 2 invalid tokens.
        now = self.hs.get_clock().time_msec()
        # Create always valid token
        valid1 = self._new_token()
        # Create token that hasn't been used up
        valid2 = self._new_token(uses_allowed=1)
        # Create token that has expired
        invalid1 = self._new_token(expiry_time=now - 10000)
        # Create token that has been used up but hasn't expired
        invalid2 = self._new_token(
            uses_allowed=2,
            pending=1,
            completed=1,
            expiry_time=now + 1000000,
        )

        if valid == "true":
            tokens = [valid1, valid2]
        else:
            tokens = [invalid1, invalid2]

        channel = self.make_request(
            "GET",
            self.url + "?valid=" + valid,
            {},
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(len(channel.json_body["registration_tokens"]), 2)
        token_info_1 = channel.json_body["registration_tokens"][0]
        token_info_2 = channel.json_body["registration_tokens"][1]
        self.assertIn(token_info_1["token"], tokens)
        self.assertIn(token_info_2["token"], tokens)

    def test_list_valid(self) -> None:
        """Test listing just valid tokens."""
        self._test_list_query_parameter(valid="true")

    def test_list_invalid(self) -> None:
        """Test listing just invalid tokens."""
        self._test_list_query_parameter(valid="false")