# Copyright 2017 Vector Creations Ltd
#
# 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 signedjson.key
import unpaddedbase64

from twisted.internet.defer import Deferred

from synapse.storage.keys import FetchKeyResult

import tests.unittest


def decode_verify_key_base64(key_id: str, key_base64: str):
    key_bytes = unpaddedbase64.decode_base64(key_base64)
    return signedjson.key.decode_verify_key_bytes(key_id, key_bytes)


KEY_1 = decode_verify_key_base64(
    "ed25519:key1", "fP5l4JzpZPq/zdbBg5xx6lQGAAOM9/3w94cqiJ5jPrw"
)
KEY_2 = decode_verify_key_base64(
    "ed25519:key2", "Noi6WqcDj0QmPxCNQqgezwTlBKrfqehY1u2FyWP9uYw"
)


class KeyStoreTestCase(tests.unittest.HomeserverTestCase):
    def test_get_server_verify_keys(self):
        store = self.hs.get_datastore()

        key_id_1 = "ed25519:key1"
        key_id_2 = "ed25519:KEY_ID_2"
        d = store.store_server_verify_keys(
            "from_server",
            10,
            [
                ("server1", key_id_1, FetchKeyResult(KEY_1, 100)),
                ("server1", key_id_2, FetchKeyResult(KEY_2, 200)),
            ],
        )
        self.get_success(d)

        d = store.get_server_verify_keys(
            [("server1", key_id_1), ("server1", key_id_2), ("server1", "ed25519:key3")]
        )
        res = self.get_success(d)

        self.assertEqual(len(res.keys()), 3)
        res1 = res[("server1", key_id_1)]
        self.assertEqual(res1.verify_key, KEY_1)
        self.assertEqual(res1.verify_key.version, "key1")
        self.assertEqual(res1.valid_until_ts, 100)

        res2 = res[("server1", key_id_2)]
        self.assertEqual(res2.verify_key, KEY_2)
        # version comes from the ID it was stored with
        self.assertEqual(res2.verify_key.version, "KEY_ID_2")
        self.assertEqual(res2.valid_until_ts, 200)

        # non-existent result gives None
        self.assertIsNone(res[("server1", "ed25519:key3")])

    def test_cache(self):
        """Check that updates correctly invalidate the cache."""

        store = self.hs.get_datastore()

        key_id_1 = "ed25519:key1"
        key_id_2 = "ed25519:key2"

        d = store.store_server_verify_keys(
            "from_server",
            0,
            [
                ("srv1", key_id_1, FetchKeyResult(KEY_1, 100)),
                ("srv1", key_id_2, FetchKeyResult(KEY_2, 200)),
            ],
        )
        self.get_success(d)

        d = store.get_server_verify_keys([("srv1", key_id_1), ("srv1", key_id_2)])
        res = self.get_success(d)
        self.assertEqual(len(res.keys()), 2)

        res1 = res[("srv1", key_id_1)]
        self.assertEqual(res1.verify_key, KEY_1)
        self.assertEqual(res1.valid_until_ts, 100)

        res2 = res[("srv1", key_id_2)]
        self.assertEqual(res2.verify_key, KEY_2)
        self.assertEqual(res2.valid_until_ts, 200)

        # we should be able to look up the same thing again without a db hit
        res = store.get_server_verify_keys([("srv1", key_id_1)])
        if isinstance(res, Deferred):
            res = self.successResultOf(res)
        self.assertEqual(len(res.keys()), 1)
        self.assertEqual(res[("srv1", key_id_1)].verify_key, KEY_1)

        new_key_2 = signedjson.key.get_verify_key(
            signedjson.key.generate_signing_key("key2")
        )
        d = store.store_server_verify_keys(
            "from_server", 10, [("srv1", key_id_2, FetchKeyResult(new_key_2, 300))]
        )
        self.get_success(d)

        d = store.get_server_verify_keys([("srv1", key_id_1), ("srv1", key_id_2)])
        res = self.get_success(d)
        self.assertEqual(len(res.keys()), 2)

        res1 = res[("srv1", key_id_1)]
        self.assertEqual(res1.verify_key, KEY_1)
        self.assertEqual(res1.valid_until_ts, 100)

        res2 = res[("srv1", key_id_2)]
        self.assertEqual(res2.verify_key, new_key_2)
        self.assertEqual(res2.valid_until_ts, 300)
