Local shovels: Set default user/pass for uris like "amqp://"

deps/rabbitmq_shovel/src/rabbit_local_shovel.erl

@@ -546,7 +546,13 @@ get_user_vhost_from_amqp_param(Uri) ->
             #amqp_params_direct{username = U,
                                 password = P,
                                 virtual_host = V} ->
-                {U, P, V};
+                case {U, P} of
+                    {none, none} ->
+                        %% Default user for uris like amqp://
+                        {<<"guest">>, <<"guest">>, V};
+                    _ ->
+                        {U, P, V}
+                end;
             #amqp_params_network{username = U,
                                  password = P,
                                  virtual_host = V} ->

deps/rabbitmq_shovel/test/local_dynamic_SUITE.erl

@@ -76,7 +76,8 @@ groups() ->
                   local_to_local_quorum_credit_flow_no_ack,
                   local_to_local_stream_credit_flow_on_confirm,
                   local_to_local_stream_credit_flow_on_publish,
-                  local_to_local_stream_credit_flow_no_ack
+                  local_to_local_stream_credit_flow_no_ack,
+                  local_to_local_simple_uri
                  ]}
     ].
 
@@ -1029,6 +1030,21 @@ local_to_local_stream_credit_flow(Config, AckMode) ->
               amqp10_client:detach_link(Receiver)
       end).
 
+local_to_local_simple_uri(Config) ->
+    Src = ?config(srcq, Config),
+    Dest = ?config(destq, Config),
+    AltVHost = ?config(alt_vhost, Config),
+    Uri = <<"amqp://">>,
+    ok = rabbit_ct_broker_helpers:rpc(
+           Config, 0, rabbit_runtime_parameters, set,
+           [<<"/">>, <<"shovel">>, ?PARAM, [{<<"src-uri">>,  Uri},
+                                            {<<"dest-uri">>, [Uri]},
+                                            {<<"src-protocol">>, <<"local">>},
+                                            {<<"src-queue">>, Src},
+                                            {<<"dest-protocol">>, <<"local">>},
+                                            {<<"dest-queue">>, Dest}],
+            none]),
+    shovel_test_utils:await_shovel(Config, ?PARAM).
 
 %%----------------------------------------------------------------------------
 with_session(Config, Fun) ->