114 lines
4.1 KiB
Erlang
114 lines
4.1 KiB
Erlang
%%--------------------------------------------------------------------
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%% Copyright (c) 2020-2022 EMQ Technologies Co., Ltd. All Rights Reserved.
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%%
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%% Licensed under the Apache License, Version 2.0 (the "License");
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%% you may not use this file except in compliance with the License.
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%% You may obtain a copy of the License at
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%%
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%% http://www.apache.org/licenses/LICENSE-2.0
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%%
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%% Unless required by applicable law or agreed to in writing, software
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%% distributed under the License is distributed on an "AS IS" BASIS,
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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%% See the License for the specific language governing permissions and
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%% limitations under the License.
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%%--------------------------------------------------------------------
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-module(emqx_authz_postgresql).
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-include("emqx_authz.hrl").
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-include_lib("emqx/include/emqx.hrl").
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-include_lib("emqx/include/logger.hrl").
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-include_lib("emqx/include/emqx_placeholder.hrl").
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-behaviour(emqx_authz).
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%% AuthZ Callbacks
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-export([ description/0
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, init/1
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, destroy/1
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, dry_run/1
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, authorize/4
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]).
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-ifdef(TEST).
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-compile(export_all).
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-compile(nowarn_export_all).
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-endif.
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-define(PLACEHOLDERS, [?PH_USERNAME,
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?PH_CLIENTID,
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?PH_PEERHOST,
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?PH_CERT_CN_NAME,
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?PH_CERT_SUBJECT]).
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description() ->
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"AuthZ with PostgreSQL".
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init(#{query := SQL0} = Source) ->
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{SQL, PlaceHolders} = emqx_authz_utils:parse_sql(
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SQL0,
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'$n',
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?PLACEHOLDERS),
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ResourceID = emqx_authz_utils:make_resource_id(emqx_connector_pgsql),
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case emqx_resource:create_local(
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ResourceID,
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?RESOURCE_GROUP,
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emqx_connector_pgsql,
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Source#{named_queries => #{ResourceID => SQL}},
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#{}) of
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{ok, _} ->
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Source#{annotations =>
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#{id => ResourceID,
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placeholders => PlaceHolders}};
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{error, Reason} ->
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error({load_config_error, Reason})
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end.
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destroy(#{annotations := #{id := Id}}) ->
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ok = emqx_resource:remove_local(Id).
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dry_run(Source) ->
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emqx_resource:create_dry_run_local(emqx_connector_pgsql, Source).
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authorize(Client, PubSub, Topic,
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#{annotations := #{id := ResourceID,
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placeholders := Placeholders
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}
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}) ->
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RenderedParams = emqx_authz_utils:render_sql_params(Placeholders, Client),
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case emqx_resource:query(ResourceID, {prepared_query, ResourceID, RenderedParams}) of
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{ok, _Columns, []} -> nomatch;
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{ok, Columns, Rows} ->
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do_authorize(Client, PubSub, Topic, Columns, Rows);
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{error, Reason} ->
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?SLOG(error, #{ msg => "query_postgresql_error"
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, reason => Reason
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, params => RenderedParams
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, resource_id => ResourceID}),
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nomatch
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end.
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do_authorize(_Client, _PubSub, _Topic, _Columns, []) ->
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nomatch;
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do_authorize(Client, PubSub, Topic, Columns, [Row | Tail]) ->
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case emqx_authz_rule:match(Client, PubSub, Topic,
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emqx_authz_rule:compile(format_result(Columns, Row))
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) of
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{matched, Permission} -> {matched, Permission};
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nomatch -> do_authorize(Client, PubSub, Topic, Columns, Tail)
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end.
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format_result(Columns, Row) ->
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Permission = lists:nth(index(<<"permission">>, 2, Columns), erlang:tuple_to_list(Row)),
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Action = lists:nth(index(<<"action">>, 2, Columns), erlang:tuple_to_list(Row)),
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Topic = lists:nth(index(<<"topic">>, 2, Columns), erlang:tuple_to_list(Row)),
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{Permission, all, Action, [Topic]}.
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index(Key, N, TupleList) when is_integer(N) ->
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Tuple = lists:keyfind(Key, N, TupleList),
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index(Tuple, TupleList, 1);
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index(_Tuple, [], _Index) -> {error, not_found};
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index(Tuple, [Tuple | _TupleList], Index) -> Index;
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index(Tuple, [_ | TupleList], Index) -> index(Tuple, TupleList, Index + 1).
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