%%--------------------------------------------------------------------
%% Copyright (c) 2020-2021 EMQ Technologies Co., Ltd. All Rights Reserved.
%%
%% 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.
%%--------------------------------------------------------------------

-module(emqx_authz_mysql_SUITE).

-compile(nowarn_export_all).
-compile(export_all).

-include("emqx_authz.hrl").
-include_lib("eunit/include/eunit.hrl").
-include_lib("common_test/include/ct.hrl").


-define(MYSQL_HOST, "mysql").
-define(MYSQL_PORT, 3306).
-define(MYSQL_RESOURCE, <<"emqx_authz_mysql_SUITE">>).

all() ->
    emqx_common_test_helpers:all(?MODULE).

groups() ->
    [].

init_per_suite(Config) ->
    case emqx_authn_test_lib:is_tcp_server_available(?MYSQL_HOST, ?MYSQL_PORT) of
        true ->
            ok = emqx_common_test_helpers:start_apps(
                   [emqx_conf, emqx_authz],
                   fun set_special_configs/1
                  ),
            ok = start_apps([emqx_resource, emqx_connector]),
            {ok, _} = emqx_resource:create_local(
              ?MYSQL_RESOURCE,
              emqx_connector_mysql,
              mysql_config()),
            Config;
        false ->
            {skip, no_mysql}
    end.

end_per_suite(_Config) ->
    ok = emqx_authz_test_lib:restore_authorizers(),
    ok = emqx_resource:remove_local(?MYSQL_RESOURCE),
    ok = stop_apps([emqx_resource, emqx_connector]),
    ok = emqx_common_test_helpers:stop_apps([emqx_authz]).

init_per_testcase(_TestCase, Config) ->
    ok = emqx_authz_test_lib:reset_authorizers(),
    Config.

set_special_configs(emqx_authz) ->
    ok = emqx_authz_test_lib:reset_authorizers();

set_special_configs(_) ->
    ok.

%%------------------------------------------------------------------------------
%% Testcases
%%------------------------------------------------------------------------------

t_topic_rules(_Config) ->
    ClientInfo = #{clientid => <<"clientid">>,
                   username => <<"username">>,
                   peerhost => {127,0,0,1},
                   zone => default,
                   listener => {tcp, default}
                  },

    ok = emqx_authz_test_lib:test_no_topic_rules(ClientInfo, fun setup_client_samples/2),

    ok = emqx_authz_test_lib:test_allow_topic_rules(ClientInfo, fun setup_client_samples/2),

    ok = emqx_authz_test_lib:test_deny_topic_rules(ClientInfo, fun setup_client_samples/2).


t_lookups(_Config) ->
    ClientInfo = #{clientid => <<"clientid">>,
                   cn => <<"cn">>,
                   dn => <<"dn">>,
                   username => <<"username">>,
                   peerhost => {127,0,0,1},
                   zone => default,
                   listener => {tcp, default}
                  },

    %% by clientid

    ok = init_table(),
    ok = q(<<"INSERT INTO acl(clientid, topic, permission, action)"
             "VALUES(?, ?, ?, ?)">>,
           [<<"clientid">>, <<"a">>, <<"allow">>, <<"subscribe">>]),

    ok = setup_config(
      #{<<"query">> => <<"SELECT permission, action, topic "
                         "FROM acl WHERE clientid = ${clientid}">>}),

    ok = emqx_authz_test_lib:test_samples(
           ClientInfo,
           [{allow, subscribe, <<"a">>},
            {deny, subscribe, <<"b">>}]),

    %% by peerhost

    ok = init_table(),
    ok = q(<<"INSERT INTO acl(peerhost, topic, permission, action)"
             "VALUES(?, ?, ?, ?)">>,
           [<<"127.0.0.1">>, <<"a">>, <<"allow">>, <<"subscribe">>]),

    ok = setup_config(
      #{<<"query">> => <<"SELECT permission, action, topic "
                         "FROM acl WHERE peerhost = ${peerhost}">>}),

    ok = emqx_authz_test_lib:test_samples(
           ClientInfo,
           [{allow, subscribe, <<"a">>},
            {deny, subscribe, <<"b">>}]),

    %% by cn

    ok = init_table(),
    ok = q(<<"INSERT INTO acl(cn, topic, permission, action)"
             "VALUES(?, ?, ?, ?)">>,
           [<<"cn">>, <<"a">>, <<"allow">>, <<"subscribe">>]),

    ok = setup_config(
      #{<<"query">> => <<"SELECT permission, action, topic "
                         "FROM acl WHERE cn = ${cert_common_name}">>}),

    ok = emqx_authz_test_lib:test_samples(
           ClientInfo,
           [{allow, subscribe, <<"a">>},
            {deny, subscribe, <<"b">>}]),

    %% by dn

    ok = init_table(),
    ok = q(<<"INSERT INTO acl(dn, topic, permission, action)"
             "VALUES(?, ?, ?, ?)">>,
           [<<"dn">>, <<"a">>, <<"allow">>, <<"subscribe">>]),

    ok = setup_config(
      #{<<"query">> => <<"SELECT permission, action, topic "
                         "FROM acl WHERE dn = ${cert_subject}">>}),

    ok = emqx_authz_test_lib:test_samples(
           ClientInfo,
           [{allow, subscribe, <<"a">>},
            {deny, subscribe, <<"b">>}]).

t_mysql_error(_Config) ->
    ClientInfo = #{clientid => <<"clientid">>,
                   username => <<"username">>,
                   peerhost => {127,0,0,1},
                   zone => default,
                   listener => {tcp, default}
                  },

    ok = setup_config(
      #{<<"query">> => <<"SOME INVALID STATEMENT">>}),

    ok = emqx_authz_test_lib:test_samples(
           ClientInfo,
           [{deny, subscribe, <<"a">>}]).


t_create_invalid(_Config) ->
    BadConfig = maps:merge(
                  raw_mysql_authz_config(),
                  #{<<"server">> => <<"255.255.255.255:33333">>}),
    {error, _} = emqx_authz:update(?CMD_REPLACE, [BadConfig]),

    [] = emqx_authz:lookup().

t_nonbinary_values(_Config) ->
    ClientInfo = #{clientid => clientid,
                   username => "username",
                   peerhost => {127,0,0,1},
                   zone => default,
                   listener => {tcp, default}
                  },


    ok = init_table(),
    ok = q(<<"INSERT INTO acl(clientid, username, topic, permission, action)"
             "VALUES(?, ?, ?, ?, ?)">>,
           [<<"clientid">>, <<"username">>, <<"a">>, <<"allow">>, <<"subscribe">>]),

    ok = setup_config(
      #{<<"query">> => <<"SELECT permission, action, topic "
                         "FROM acl WHERE clientid = ${clientid} AND username = ${username}">>}),

    ok = emqx_authz_test_lib:test_samples(
           ClientInfo,
           [{allow, subscribe, <<"a">>},
            {deny, subscribe, <<"b">>}]).

%%------------------------------------------------------------------------------
%% Helpers
%%------------------------------------------------------------------------------

raw_mysql_authz_config() ->
    #{
        <<"enable">> => <<"true">>,

        <<"type">> => <<"mysql">>,
        <<"database">> => <<"mqtt">>,
        <<"username">> => <<"root">>,
        <<"password">> => <<"public">>,

        <<"query">> => <<"SELECT permission, action, topic "
                         "FROM acl WHERE username = ${username}">>,

        <<"server">> => mysql_server()
    }.

q(Sql) ->
    emqx_resource:query(
      ?MYSQL_RESOURCE,
      {sql, Sql}).

q(Sql, Params) ->
    emqx_resource:query(
      ?MYSQL_RESOURCE,
      {sql, Sql, Params}).

init_table() ->
    ok = drop_table(),
    ok = q("CREATE TABLE acl(
                       username VARCHAR(255),
                       clientid VARCHAR(255),
                       peerhost VARCHAR(255),
                       cn VARCHAR(255),
                       dn VARCHAR(255),
                       topic VARCHAR(255),
                       permission VARCHAR(255),
                       action VARCHAR(255))").

drop_table() ->
    ok = q("DROP TABLE IF EXISTS acl").

setup_client_samples(ClientInfo, Samples) ->
    #{username := Username} = ClientInfo,
    ok = init_table(),
    ok = lists:foreach(
           fun(#{topics := Topics, permission := Permission, action := Action}) ->
                   lists:foreach(
                     fun(Topic) ->
                             q(<<"INSERT INTO acl(username, topic, permission, action)"
                                 "VALUES(?, ?, ?, ?)">>,
                               [Username, Topic, Permission, Action])
                     end,
                     Topics)
           end,
           Samples),
    setup_config(
      #{<<"query">> => <<"SELECT permission, action, topic "
                         "FROM acl WHERE username = ${username}">>}).

setup_config(SpecialParams) ->
    emqx_authz_test_lib:setup_config(
      raw_mysql_authz_config(),
      SpecialParams).

mysql_server() ->
    iolist_to_binary(
      io_lib:format(
        "~s:~b",
        [?MYSQL_HOST, ?MYSQL_PORT])).

mysql_config() ->
    #{auto_reconnect => true,
      database => <<"mqtt">>,
      username => <<"root">>,
      password => <<"public">>,
      pool_size => 8,
      server => {?MYSQL_HOST, ?MYSQL_PORT},
      ssl => #{enable => false}
     }.

start_apps(Apps) ->
    lists:foreach(fun application:ensure_all_started/1, Apps).

stop_apps(Apps) ->
    lists:foreach(fun application:stop/1, Apps).