feat(api-clients): return client mountpoint property

apps/emqx_gateway/i18n/emqx_gateway_api_clients_i18n.conf

@@ -245,6 +245,13 @@ emqx_gateway_api_clients {
         }
     }
 
+    mountpoint {
+        desc {
+            en: """Topic mountpoint"""
+            zh: """主题固定前缀"""
+        }
+    }
+
     proto_name {
         desc {
             en: """Client protocol name"""

apps/emqx_gateway/src/emqx_gateway_api_clients.erl

@@ -174,9 +174,7 @@ clients_insta(delete, #{
         {204}
     end).
 
-%% FIXME:
-%% List the subscription without mountpoint, but has SubOpts,
-%% for example, share group ...
+%% List the established subscriptions with mountpoint
 subscriptions(get, #{
     bindings := #{
         name := Name0,
@@ -189,7 +187,7 @@ subscriptions(get, #{
             {error, not_found} ->
                 return_http_error(404, "client process not found");
             {error, Reason} ->
-                return_http_error(500, Reason);
+                return_http_error(400, Reason);
             {ok, Subs} ->
                 {200, Subs}
         end
@@ -216,7 +214,7 @@ subscriptions(post, #{
                     {error, not_found} ->
                         return_http_error(404, "client process not found");
                     {error, Reason} ->
-                        return_http_error(500, Reason);
+                        return_http_error(400, Reason);
                     {ok, {NTopic, NSubOpts}} ->
                         {201, maps:merge(NSubOpts, #{topic => NTopic})}
                 end
@@ -368,6 +366,7 @@ format_channel_info({_, Infos, Stats} = R) ->
         {node, ClientInfo, Node},
         {clientid, ClientInfo},
         {username, ClientInfo},
+        {mountpoint, ClientInfo},
         {proto_name, ConnInfo},
         {proto_ver, ConnInfo},
         {ip_address, {peername, ConnInfo, fun peer_to_binary_addr/1}},
@@ -813,6 +812,11 @@ common_client_props() ->
                 binary(),
                 #{desc => ?DESC(username)}
             )},
+        {mountpoint,
+            mk(
+                binary(),
+                #{desc => ?DESC(mountpoint)}
+            )},
         {proto_name,
             mk(
                 binary(),

apps/emqx_management/src/emqx_mgmt_api_clients.erl

@@ -492,6 +492,7 @@ fields(client) ->
                         " Maximum number of subscriptions allowed by this client">>
             })},
         {username, hoconsc:mk(binary(), #{desc => <<"User name of client when connecting">>})},
+        {mountpoint, hoconsc:mk(binary(), #{desc => <<"Topic mountpoint">>})},
         {will_msg, hoconsc:mk(binary(), #{desc => <<"Client will message">>})},
         {zone,
             hoconsc:mk(binary(), #{
@@ -849,7 +850,6 @@ format_channel_info({_, ClientInfo0, ClientStats}) ->
             is_superuser,
             sockport,
             anonymous,
-            mountpoint,
             socktype,
             active_n,
             await_rel_timeout,