Set default value when null is passed to GraphQL API

big_tests/tests/graphql_muc_light_SUITE.erl

@@ -116,6 +116,7 @@ admin_muc_light_tests() ->
      admin_get_room_config,
      admin_get_room_config_non_existent_domain,
      admin_blocking_list,
+     admin_blocking_list_null,
      admin_blocking_list_errors
     ].
 
@@ -881,6 +882,30 @@ admin_blocking_list_story(Config, Alice, Bob) ->
     Res5 = get_user_blocking(AliceBin, Config),
     ?assertMatch([], get_ok_value(?GET_BLOCKING_LIST_PATH, Res5)).
 
+admin_blocking_list_null(Config) ->
+    escalus:fresh_story_with_config(Config, [{alice, 1}, {bob, 1}],
+                                    fun admin_blocking_list_null_story/3).
+
+admin_blocking_list_null_story(Config, Alice, Bob) ->
+    AliceBin = escalus_client:full_jid(Alice),
+    BobBin = escalus_client:full_jid(Bob),
+    BobShortBin = escalus_utils:jid_to_lower(escalus_client:short_jid(Bob)),
+    Res = get_user_blocking(AliceBin, Config),
+    ?assertMatch([], get_ok_value(?GET_BLOCKING_LIST_PATH, Res)),
+    Res2 = set_blocking(AliceBin, [{<<"USER">>, null, BobBin}], Config),
+    ?assertNotEqual(nomatch, binary:match(get_ok_value(?SET_BLOCKING_LIST_PATH, Res2),
+                                            <<"successfully">>)),
+    Res3 = get_user_blocking(AliceBin, Config),
+    ?assertEqual([#{<<"entityType">> => <<"USER">>,
+                    <<"action">> => <<"DENY">>,
+                    <<"entity">> => BobShortBin}],
+                    get_ok_value(?GET_BLOCKING_LIST_PATH, Res3)),
+    Res4 = set_blocking(AliceBin, [{<<"USER">>, <<"ALLOW">>, BobBin}], Config),
+    ?assertNotEqual(nomatch, binary:match(get_ok_value(?SET_BLOCKING_LIST_PATH, Res4),
+                                            <<"successfully">>)),
+    Res5 = get_user_blocking(AliceBin, Config),
+    ?assertMatch([], get_ok_value(?GET_BLOCKING_LIST_PATH, Res5)).
+
 admin_blocking_list_errors(Config) ->
     InvalidUser = make_bare_jid(?UNKNOWN, ?UNKNOWN_DOMAIN),
     Res = get_user_blocking(InvalidUser, Config),

big_tests/tests/graphql_stanza_SUITE.erl

@@ -40,6 +40,7 @@ admin_get_last_messages_cases() ->
      admin_get_last_messages_for_unknown_user,
      admin_get_last_messages_with,
      admin_get_last_messages_limit,
+     admin_get_last_messages_limit_null,
      admin_get_last_messages_limit_enforced,
      admin_get_last_messages_before].
 
@@ -399,6 +400,19 @@ admin_get_last_messages_limit_story(Config, Alice, Bob) ->
         get_ok_value([data, stanza, getLastMessages], Res),
     check_stanza_map(M1, Bob).
 
+admin_get_last_messages_limit_null(Config) ->
+    escalus:fresh_story_with_config(Config, [{alice, 1}, {bob, 1}],
+                                    fun admin_get_last_messages_limit_null_story/3).
+
+admin_get_last_messages_limit_null_story(Config, Alice, Bob) ->
+    admin_send_message_story(Config, Alice, Bob),
+    mam_helper:wait_for_archive_size(Alice, 1),
+    Caller = escalus_client:full_jid(Alice),
+    Res = get_last_messages(Caller, null, null, null, Config),
+    #{<<"stanzas">> := [M1], <<"limit">> := 50} =
+        get_ok_value([data, stanza, getLastMessages], Res),
+    check_stanza_map(M1, Alice).
+
 admin_get_last_messages_limit_enforced(Config) ->
     escalus:fresh_story_with_config(Config, [{alice, 1}, {bob, 1}],
                                     fun admin_get_last_messages_limit_enforced_story/3).

priv/graphql/schemas/global/muc_light.gql

@@ -13,7 +13,7 @@ input BlockingInput{
   "Type of entity to block"
   entityType: BlockedEntityType!
   "Type of blocking action"
-  action: BlockingAction!
+  action: BlockingAction! = DENY
   "Entity's JID"
   entity: JID!
 }

rebar.lock

@@ -49,7 +49,7 @@
  {<<"goldrush">>,{pkg,<<"goldrush">>,<<"0.1.9">>},1},
  {<<"graphql">>,
   {git,"https://github.com/esl/graphql-erlang.git",
-       {ref,"72bf290d50b4b5e2f462e06ccfdc5645a6d6401a"}},
+       {ref,"7bca478ed484b0859f986f3c74f1013c872265bb"}},
   0},
  {<<"gun">>,{pkg,<<"gun">>,<<"1.3.3">>},0},
  {<<"hackney">>,{pkg,<<"hackney">>,<<"1.13.0">>},1},

src/graphql/mongoose_graphql.erl

@@ -74,7 +74,8 @@ execute(Ep, #{document := Doc,
         {ok, #{ast := Ast2,
                fun_env := FunEnv}} = graphql:type_check(Ep, Ast),
         ok = graphql:validate(Ast2),
-        Coerced = graphql:type_check_params(Ep, FunEnv, OpName, Vars),
+        Vars2 = remove_null_args(Vars),
+        Coerced = graphql:type_check_params(Ep, FunEnv, OpName, Vars2),
         Ctx2 = Ctx#{params => Coerced,
                     operation_name => OpName,
                     authorized => AuthStatus,
@@ -125,6 +126,9 @@ graphql_parse(Doc) ->
             graphql_err:abort([], parse, Err)
     end.
 
+remove_null_args(Vars) ->
+    maps:filter(fun(_Key, Value) -> Value /= null end, Vars).
+
 admin_mapping_rules() ->
     #{objects => #{
         'AdminQuery' => mongoose_graphql_admin_query,