fix sign

apps/njau_bot/src/http_handler/api_handler.erl

@@ -19,7 +19,7 @@ init(Req0, Opts) ->
     {ok, ReqBody, Req1} = parse_body(Req0),
     Sign = cowboy_req:header(<<"sign">>, Req1, <<>>),
     BodySign = njau_bot_signer:sign(ReqBody),
-    case BodySign =:= Sign of
+    case BodySign =:= string:lowercase(Sign) of
         true ->
             {ok, StatusCode, Resp} = handle_request(Method, Path, ReqBody),
             lager:debug("[http_protocol] request path: ~p, post_params: ~p, response: ~ts",

apps/njau_bot/src/njau_bot_signer.erl

@@ -10,7 +10,7 @@
 -author("anlicheng").
 
 %% API
--export([sign/1]).
+-export([sign/1, md5/1]).
 
 %% 数据签名
 -spec sign(S :: binary()) -> binary().