Secret and tag now have to be put into config in hex

README.md

@@ -3,6 +3,8 @@ Erlang mtproto proxy
 
 This part of code was extracted from [@socksy_bot](https://t.me/socksy_bot).
 
+This implementation supports promoted channels! See `mtproto_proxy_app.src` `tag` option.
+
 How to start
 ------------
 
@@ -49,6 +51,7 @@ See `src/mtproto_proxy.app.src`.
 
 Secret key will be printed on start.
 
+
 Helpers
 -------
 

src/mtp_handler.erl

@@ -11,7 +11,7 @@
 
 %% API
 -export([start_link/4]).
--export([hex/1]).
+-export([hex/1, unhex/1]).
 -export([keys_str/0]).
 
 %% Callbacks
@@ -103,8 +103,8 @@ init({_Ref, Socket, Transport, [Secret, Tag]}) ->
             Timer = gen_timeout:new(
                       #{timeout => {env, ?APP, TimeoutKey, TimeoutDefault}}),
             State = #state{up_sock = Socket,
-                           secret = Secret,
-                           proxy_tag = Tag,
+                           secret = unhex(Secret),
+                           proxy_tag = unhex(Tag),
                            up_transport = Transport,
                            started_at = erlang:system_time(second),
                            timer = Timer},
@@ -486,6 +486,13 @@ hex(Bin) ->
          end
      end || <<N:4>> <= Bin>>.
 
+unhex(Chars) ->
+    UnHChar = fun(C) when C < $W -> C - $0;
+                 (C) when C > $W -> C - $W
+              end,
+    << <<(UnHChar(C)):4>> || <<C>> <= Chars>>.
+
+
 track(Direction, Data) ->
     Size = byte_size(Data),
     metric:count_inc([?APP, tracker, bytes], Size, #{labels => [Direction]}),

src/mtproto_proxy.app.src

@@ -19,8 +19,8 @@
         %% {external_ip, "YOUR.SERVER.EXTERNAL.IP"},
         {ports, [#{name => mtp_handler,
                    port => 1443,
-                   secret => <<208,214,225,17,186,218,85,17,252,206,149,132,222,173,190,239>>,
-                   tag => <<220,190,143,20,147,250,76,217,171,48,8,145,192,181,179,38>>}]},
+                   secret => <<"d0d6e111bada5511fcce9584deadbeef">>,
+                   tag => <<"dcbe8f1493fa4cd9ab300891c0b5b326">>}]},
         {num_acceptors, 60},
         {max_connections, 20480}
        ]},

src/mtproto_proxy_app.erl

@@ -42,8 +42,8 @@ start_proxy(#{name := Name, port := Port, secret := Secret, tag := Tag}) ->
            {num_acceptors, NumAcceptors},
            {max_connections, MaxConnections}],
           mtp_handler, [Secret, Tag]),
-    io:format("Proxy started on ~s:~p with key: ~s~n",
-              [inet:ntoa(ListenIp), Port, mtp_handler:hex(Secret)]),
+    io:format("Proxy started on ~s:~p with secret: ~s~n",
+              [inet:ntoa(ListenIp), Port, Secret]),
     Res.
 
 stop_proxy(#{name := Name}) ->