chore(authz): move file backend to a separate module

apps/emqx_authz/include/emqx_authz.hrl

@@ -1,22 +1,3 @@
--type(ipaddress() :: {ipaddr,  esockd_cidr:cidr_string()} |
-                     {ipaddrs, list(esockd_cidr:cidr_string())}).
-
--type(username() :: {username, binary()}).
-
--type(clientid() :: {clientid, binary()}).
-
--type(who() :: ipaddress() | username() | clientid() |
-               {'and', [ipaddress() | username() | clientid()]} |
-               {'or',  [ipaddress() | username() | clientid()]} |
-               all).
-
--type(action() :: subscribe | publish | all).
-
--type(permission() :: allow | deny).
-
--type(rule() :: {permission(), who(), action(), list(emqx_types:topic())}).
--type(rules() :: [rule()]).
-
 -define(APP, emqx_authz).
 
 -define(ALLOW_DENY(A), ((A =:= allow) orelse (A =:= <<"allow">>) orelse
@@ -36,6 +17,9 @@
 -define(ACL_TABLE_USERNAME, 1).
 -define(ACL_TABLE_CLIENTID, 2).
 
+-type(action() :: subscribe | publish | all).
+-type(permission() :: allow | deny).
+
 -record(emqx_acl, {
           who :: ?ACL_TABLE_ALL| {?ACL_TABLE_USERNAME, binary()} | {?ACL_TABLE_CLIENTID, binary()},
           rules :: [ {permission(), action(), emqx_topic:topic()} ]

apps/emqx_authz/src/emqx_authz.erl

@@ -333,8 +333,6 @@ find_action_in_hooks() ->
 
 authz_module('built-in-database') ->
     emqx_authz_mnesia;
-authz_module(file) ->
-    emqx_authz_rule;
 authz_module(Type) ->
     list_to_existing_atom("emqx_authz_" ++ atom_to_list(Type)).
 

apps/emqx_authz/src/emqx_authz_file.erl

@@ -0,0 +1,61 @@
+%%--------------------------------------------------------------------
+%% 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_file).
+
+-include("emqx_authz.hrl").
+-include_lib("emqx/include/logger.hrl").
+
+-behaviour(emqx_authz).
+
+-ifdef(TEST).
+-compile(export_all).
+-compile(nowarn_export_all).
+-endif.
+
+%% APIs
+-export([ description/0
+        , init/1
+        , destroy/1
+        , dry_run/1
+        , authorize/4
+        ]).
+
+description() ->
+    "AuthZ with static rules".
+
+init(#{path := Path} = Source) ->
+    Rules = case file:consult(Path) of
+                {ok, Terms} ->
+                    [emqx_authz_rule:compile(Term) || Term <- Terms];
+                {error, eacces} ->
+                    ?SLOG(alert, #{msg => "insufficient_permissions_to_read_file", path => Path}),
+                    error(eaccess);
+                {error, enoent} ->
+                    ?SLOG(alert, #{msg => "file_does_not_exist", path => Path}),
+                    error(enoent);
+                {error, Reason} ->
+                    ?SLOG(alert, #{msg => "failed_to_read_file", path => Path, reason => Reason}),
+                    error(Reason)
+            end,
+    Source#{annotations => #{rules => Rules}}.
+
+destroy(_Source) -> ok.
+
+dry_run(_Source) -> ok.
+
+authorize(Client, PubSub, Topic, #{annotations := #{rules := Rules}}) ->
+    emqx_authz_rule:matches(Client, PubSub, Topic, Rules).

apps/emqx_authz/src/emqx_authz_rule.erl

@@ -20,49 +20,33 @@
 -include_lib("emqx/include/logger.hrl").
 -include_lib("emqx/include/emqx_placeholder.hrl").
 
--behaviour(emqx_authz).
-
 -ifdef(TEST).
 -compile(export_all).
 -compile(nowarn_export_all).
 -endif.
 
 %% APIs
--export([ description/0
+-export([ match/4
-        , init/1
+        , matches/4
-        , destroy/1
+        , compile/1
-        , dry_run/1
-        , authorize/4
         ]).
 
+-type(ipaddress() :: {ipaddr,  esockd_cidr:cidr_string()} |
+                     {ipaddrs, list(esockd_cidr:cidr_string())}).
+
+-type(username() :: {username, binary()}).
+
+-type(clientid() :: {clientid, binary()}).
+
+-type(who() :: ipaddress() | username() | clientid() |
+               {'and', [ipaddress() | username() | clientid()]} |
+               {'or',  [ipaddress() | username() | clientid()]} |
+               all).
+
+-type(rule() :: {permission(), who(), action(), list(emqx_types:topic())}).
+
 -export_type([rule/0]).
 
-description() ->
-    "AuthZ with static rules".
-
-init(#{path := Path} = Source) ->
-    Rules = case file:consult(Path) of
-                {ok, Terms} ->
-                    [compile(Term) || Term <- Terms];
-                {error, eacces} ->
-                    ?SLOG(alert, #{msg => "insufficient_permissions_to_read_file", path => Path}),
-                    error(eaccess);
-                {error, enoent} ->
-                    ?SLOG(alert, #{msg => "file_does_not_exist", path => Path}),
-                    error(enoent);
-                {error, Reason} ->
-                    ?SLOG(alert, #{msg => "failed_to_read_file", path => Path, reason => Reason}),
-                    error(Reason)
-            end,
-    Source#{annotations => #{rules => Rules}}.
-
-destroy(_Source) -> ok.
-
-dry_run(_Source) -> ok.
-
-authorize(Client, PubSub, Topic, #{annotations := #{rules := Rules}}) ->
-    matches(Client, PubSub, Topic, Rules).
-
 compile({Permission, all})
   when ?ALLOW_DENY(Permission) -> {Permission, all, all, [compile_topic(<<"#">>)]};
 compile({Permission, Who, Action, TopicFilters})