Add function that detects if token is JWT

Author: MarcialRosales

deps/rabbitmq_auth_backend_oauth2/src/uaa_jwt_jwt.erl

@@ -6,7 +6,7 @@
 %%
 -module(uaa_jwt_jwt).
 
--export([decode_and_verify/3, get_key_id/1, get_aud/1]).
+-export([decode_and_verify/3, get_key_id/1, get_aud/1, is_jwt_token/1]).
 
 -include_lib("jose/include/jose_jwt.hrl").
 -include_lib("jose/include/jose_jws.hrl").
@@ -42,3 +42,9 @@ get_aud(Token) ->
     catch Type:Err:Stacktrace ->
         {error, {invalid_token, Type, Err, Stacktrace}}
     end.
+
+is_jwt_token(Token) ->
+    case binary:split(Token, <<".">>, [global]) of 
+        [_, _, _] -> true;
+        _ -> false
+    end.

deps/rabbitmq_auth_backend_oauth2/test/jwks_SUITE.erl

@@ -41,6 +41,8 @@ all() ->
 
 groups() ->
     [{happy_path, [], [
+        test_is_jwt_token,
+        test_is_not_jwt_token,
         test_successful_connection_with_a_full_permission_token_and_all_defaults,
         test_successful_connection_with_a_full_permission_token_and_explicitly_configured_vhost,
         test_successful_connection_with_simple_strings_for_aud_and_scope,
@@ -685,6 +687,13 @@ test_successful_connection_with_a_full_permission_token_and_all_defaults(Config)
     {_Algo, Token} = get_config(Config, fixture_jwt),
     verify_queue_declare_with_token(Config, Token).
 
+test_is_jwt_token(Config) ->
+    {_Algo, Token} = get_config(Config, fixture_jwt),
+    ?assertEqual(true, uaa_jwt_jwt:is_jwt_token(Token)).
+
+test_is_not_jwt_token(_) ->
+    ?assertEqual(false, uaa_jwt_jwt:is_jwt_token(<<"some opaque token">>)).
+
 verify_queue_declare_with_token(Config, Token) ->
     Conn     = open_unmanaged_connection(Config, 0, <<"username">>, Token),
     {ok, Ch} = amqp_connection:open_channel(Conn),