chore(emqx_auth_jwt): do not use gen_server call for jwt verification

apps/emqx_auth_jwt/src/emqx_auth_jwt.erl

@@ -46,8 +46,7 @@ register_metrics() ->
 %% Authentication callbacks
 %%--------------------------------------------------------------------
 
-check(ClientInfo, AuthResult, #{pid := Pid,
-                                from := From,
+check(ClientInfo, AuthResult, #{from := From,
                                 checklists := Checklists}) ->
     case maps:find(From, ClientInfo) of
         error ->
@@ -55,7 +54,7 @@ check(ClientInfo, AuthResult, #{pid := Pid,
         {ok, undefined} ->
             ok = emqx_metrics:inc(?AUTH_METRICS(ignore));
         {ok, Token} ->
-            case emqx_auth_jwt_svr:verify(Pid, Token) of
+            case emqx_auth_jwt_svr:verify(Token) of
                 {error, not_found} ->
                     ok = emqx_metrics:inc(?AUTH_METRICS(ignore));
                 {error, not_token} ->

apps/emqx_auth_jwt/src/emqx_auth_jwt_app.erl

@@ -33,11 +33,10 @@ start(_Type, _Args) ->
 
     {ok, Pid} = start_auth_server(jwks_svr_options()),
     ok = emqx_auth_jwt:register_metrics(),
-    AuthEnv0 = auth_env(),
-    AuthEnv1 = AuthEnv0#{pid => Pid},
+    AuthEnv = auth_env(),
 
-    _ = emqx:hook('client.authenticate', {emqx_auth_jwt, check, [AuthEnv1]}),
-    {ok, Sup, AuthEnv1}.
+    _ = emqx:hook('client.authenticate', {emqx_auth_jwt, check, [AuthEnv]}),
+    {ok, Sup, AuthEnv}.
 
 stop(AuthEnv) ->
     emqx:unhook('client.authenticate', {emqx_auth_jwt, check, [AuthEnv]}).

apps/emqx_auth_jwt/src/emqx_auth_jwt_svr.erl

@@ -26,7 +26,7 @@
 %% APIs
 -export([start_link/1]).
 
--export([verify/2]).
+-export([verify/1]).
 
 %% gen_server callbacks
 -export([ init/1
@@ -44,8 +44,9 @@
                 | {interval, pos_integer()}.
 
 -define(INTERVAL, 300000).
+-define(TAB, ?MODULE).
 
--record(state, {static, remote, addr, tref, intv}).
+-record(state, {addr, tref, intv}).
 
 %%--------------------------------------------------------------------
 %% APIs
@@ -55,13 +56,13 @@
 start_link(Options) ->
     gen_server:start_link(?MODULE, [Options], []).
 
--spec verify(pid(), binary())
+-spec verify(binary())
     -> {error, term()}
      | {ok, Payload :: map()}.
-verify(S, JwsCompacted) when is_binary(JwsCompacted) ->
+verify(JwsCompacted) when is_binary(JwsCompacted) ->
     case catch jose_jws:peek(JwsCompacted) of
         {'EXIT', _} -> {error, not_token};
-        _ -> gen_server:call(S, {verify, JwsCompacted})
+        _ -> do_verify(JwsCompacted)
     end.
 
 %%--------------------------------------------------------------------
@@ -70,12 +71,13 @@ verify(S, JwsCompacted) when is_binary(JwsCompacted) ->
 
 init([Options]) ->
     ok = jose:json_module(jiffy),
+    _ = ets:new(?TAB, [set, protected, named_table]),
     {Static, Remote} = do_init_jwks(Options),
+    true = ets:insert(?TAB, {static, Static}),
+    true = ets:insert(?TAB, {remote, Remote}),
     Intv = proplists:get_value(interval, Options, ?INTERVAL),
     {ok, reset_timer(
            #state{
-              static = Static,
-              remote = Remote,
               addr = proplists:get_value(jwks_addr, Options),
               intv = Intv})}.
 
@@ -105,9 +107,6 @@ do_init_jwks(Options) ->
     Remote = K2J(jwks_addr, fun request_jwks/1),
     {[J ||J <- [OctJwk, PemJwk], J /= undefined], Remote}.
 
-handle_call({verify, JwsCompacted}, _From, State) ->
-    handle_verify(JwsCompacted, State);
-
 handle_call(_Req, _From, State) ->
     {reply, ok, State}.
 
@@ -116,7 +115,7 @@ handle_cast(_Msg, State) ->
 
 handle_info({timeout, _TRef, refresh}, State = #state{addr = Addr}) ->
     NState = try
-                 State#state{remote = request_jwks(Addr)}
+                 true = ets:insert(?TAB, {remote, request_jwks(Addr)})
              catch _:_ ->
                  State
              end,
@@ -136,24 +135,10 @@ code_change(_OldVsn, State, _Extra) ->
 %% Internal funcs
 %%--------------------------------------------------------------------
 
-handle_verify(JwsCompacted,
-              State = #state{static = Static, remote = Remote}) ->
-    try
-        Jwks = case emqx_json:decode(jose_jws:peek_protected(JwsCompacted), [return_maps]) of
-                   #{<<"kid">> := Kid} when Remote /= undefined ->
-                       [J || J <- Remote, maps:get(<<"kid">>, J#jose_jwk.fields, undefined) =:= Kid];
-                   _ -> Static
-               end,
-        case Jwks of
-            [] -> {reply, {error, not_found}, State};
-            _ ->
-                {reply, do_verify(JwsCompacted, Jwks), State}
-        end
-    catch
-        Class : Reason : Stk ->
-            ?LOG(error, "Handle JWK crashed: ~p, ~p, stacktrace: ~p~n",
-                        [Class, Reason, Stk]),
-            {reply, {error, invalid_signature}, State}
+keys(Type) ->
+    case ets:lookup(?TAB, Type) of
+        [{_, Keys}] -> Keys;
+        [] -> []
     end.
 
 request_jwks(Addr) ->
@@ -181,6 +166,26 @@ cancel_timer(State = #state{tref = TRef}) ->
     _ = erlang:cancel_timer(TRef),
     State#state{tref = undefined}.
 
+do_verify(JwsCompacted) ->
+    try
+        Remote = keys(remote),
+        Jwks = case emqx_json:decode(jose_jws:peek_protected(JwsCompacted), [return_maps]) of
+                   #{<<"kid">> := Kid} when Remote /= undefined ->
+                       [J || J <- Remote, maps:get(<<"kid">>, J#jose_jwk.fields, undefined) =:= Kid];
+                   _ -> keys(static)
+               end,
+        case Jwks of
+            [] -> {error, not_found};
+            _ ->
+                do_verify(JwsCompacted, Jwks)
+        end
+    catch
+        Class : Reason : Stk ->
+            ?LOG(error, "Handle JWK crashed: ~p, ~p, stacktrace: ~p~n",
+                        [Class, Reason, Stk]),
+            {error, invalid_signature}
+    end.
+
 do_verify(_JwsCompated, []) ->
     {error, invalid_signature};
 do_verify(JwsCompacted, [Jwk|More]) ->