Take other eldap_search_result cases into account

Reported here
#4281 (reply in thread)

Fixes #4444

Follow-up to #4285

Author: lukebakken

deps/rabbitmq_auth_backend_ldap/src/rabbit_auth_backend_ldap.erl

@@ -352,9 +352,15 @@ search_groups(LDAP, Desc, GroupsBase, Scope, DN) ->
             [];
         {ok, {referral, Referrals}} ->
             {error, {referrals_not_supported, Referrals}};
-        {ok, #eldap_search_result{entries = []}} ->
+        %% support #eldap_search_result before and after
+        %% https://github.com/erlang/otp/pull/5538
+        {ok, {eldap_search_result, [], _Referrals}} ->
             [];
-        {ok, #eldap_search_result{entries = Entries}} ->
+        {ok, {eldap_search_result, [], _Referrals, _Controls}}->
+            [];
+        {ok, {eldap_search_result, Entries, _Referrals}} ->
+            [ON || #eldap_entry{object_name = ON} <- Entries];
+        {ok, {eldap_search_result, Entries, _Referrals, _Controls}} ->
             [ON || #eldap_entry{object_name = ON} <- Entries]
     end.
 
@@ -438,7 +444,11 @@ object_exists(DN, Filter, LDAP) ->
                        {scope, eldap:baseObject()}]) of
         {ok, {referral, Referrals}} ->
             {error, {referrals_not_supported, Referrals}};
-        {ok, #eldap_search_result{entries = Entries}} ->
+        %% support #eldap_search_result before and after
+        %% https://github.com/erlang/otp/pull/5538
+        {ok, {eldap_search_result, Entries, _Referrals}} ->
+            length(Entries) > 0;
+        {ok, {eldap_search_result, Entries, _Referrals, _Controls}} ->
             length(Entries) > 0;
         {error, _} = E ->
             E
@@ -451,9 +461,15 @@ attribute(DN, AttributeName, LDAP) ->
                        {attributes, [AttributeName]}]) of
         {ok, {referral, Referrals}} ->
             {error, {referrals_not_supported, Referrals}};
-        {ok, #eldap_search_result{entries = E = [#eldap_entry{}|_]}} ->
+        %% support #eldap_search_result before and after
+        %% https://github.com/erlang/otp/pull/5538
+        {ok, {eldap_search_result, E = [#eldap_entry{}|_], _Referrals}} ->
             get_attributes(AttributeName, E);
-        {ok, #eldap_search_result{entries = _}} ->
+        {ok, {eldap_search_result, E = [#eldap_entry{}|_], _Referrals, _Controls}} ->
+            get_attributes(AttributeName, E);
+        {ok, {eldap_search_result, _Entries, _Referrals}} ->
+            {error, not_found};
+        {ok, {eldap_search_result, _Entries, _Referrals, _Controls}} ->
             {error, not_found};
         {error, _} = E ->
             E
@@ -829,15 +845,19 @@ dn_lookup(Username, LDAP) ->
                        {attributes, ["distinguishedName"]}]) of
         {ok, {referral, Referrals}} ->
             {error, {referrals_not_supported, Referrals}};
-            %% support #eldap_search_result before and after
-            %% https://github.com/erlang/otp/pull/5538
+        %% support #eldap_search_result before and after
+        %% https://github.com/erlang/otp/pull/5538
         {ok, {eldap_search_result, [#eldap_entry{object_name = DN}], _Referrals}}->
             ?L1("DN lookup: ~s -> ~s", [Username, DN]),
             DN;
         {ok, {eldap_search_result, [#eldap_entry{object_name = DN}], _Referrals, _Controls}}->
             ?L1("DN lookup: ~s -> ~s", [Username, DN]),
             DN;
-        {ok, #eldap_search_result{entries = Entries}} ->
+        {ok, {eldap_search_result, Entries, _Referrals}} ->
+            rabbit_log_ldap:warning("Searching for DN for ~s, got back ~p",
+                               [Filled, Entries]),
+            Filled;
+        {ok, {eldap_search_result, Entries, _Referrals, _Controls}} ->
             rabbit_log_ldap:warning("Searching for DN for ~s, got back ~p",
                                [Filled, Entries]),
             Filled;