feat: handle and allow JIDs with trailing slashes

Make jid_is_valid() allow JIDs ending with a slash (`user@domain/`).
In these cases, the parser now treats the input as a Bare JID with no
resource part, rather than rejecting it as invalid.

We will then just get `user@domain`.

src/xmpp/jid.c

@@ -157,11 +157,11 @@ jid_is_valid(const gchar* const str)
         domain_start = at + 1;
     }
 
-    // Resourcepart validation
+    // Resourcepart validation if present
     if (slash) {
         domain_len = slash - domain_start;
         size_t resource_len = strlen(slash + 1);
-        if (resource_len == 0 || resource_len > JID_MAX_PART_LEN) {
+        if (resource_len > JID_MAX_PART_LEN) {
             return FALSE;
         }
     } else {

tests/unittests/unittests.c

@@ -150,6 +150,7 @@ main(int argc, char* argv[])
         cmocka_unit_test(jid_create__returns__correct_parts_with_trailing_slash),
         cmocka_unit_test(jid_fulljid_or_barejid__returns__fulljid_when_exists),
         cmocka_unit_test(jid_fulljid_or_barejid__returns__barejid_when_fulljid_not_exists),
+        cmocka_unit_test(jid_create__returns__bare_from_trailing_slash),
         cmocka_unit_test(jid_create__returns__null_from_invalid_localpart_chars),
         cmocka_unit_test(jid_create__returns__null_from_empty_parts),
         cmocka_unit_test(jid_create__returns__null_from_multiple_at_in_bare),

tests/unittests/xmpp/test_jid.c

@@ -235,6 +235,16 @@ jid_fulljid_or_barejid__returns__barejid_when_fulljid_not_exists(void** state)
     jid_destroy(jid);
 }
 
+void
+jid_create__returns__bare_from_trailing_slash(void** state)
+{
+    Jid* result = jid_create("myuser@mydomain/");
+    assert_non_null(result);
+    assert_string_equal("myuser@mydomain", result->barejid);
+    assert_null(result->resourcepart);
+    jid_destroy(result);
+}
+
 void
 jid_create__returns__null_from_invalid_localpart_chars(void** state)
 {
@@ -278,10 +288,6 @@ jid_create__returns__null_from_empty_parts(void** state)
     result = jid_create("user@");
     assert_null(result);
 
-    // Empty resource (trailing /)
-    result = jid_create("user@domain.com/");
-    assert_null(result);
-
     // Empty domain in full jid
     result = jid_create("user@/resource");
     assert_null(result);

tests/unittests/xmpp/test_jid.h

@@ -26,6 +26,7 @@ void jid_create__returns__correct_parts_with_at_and_slash_in_resource(void** sta
 void jid_create__returns__correct_parts_with_trailing_slash(void** state);
 void jid_fulljid_or_barejid__returns__fulljid_when_exists(void** state);
 void jid_fulljid_or_barejid__returns__barejid_when_fulljid_not_exists(void** state);
+void jid_create__returns__bare_from_trailing_slash(void** state);
 void jid_create__returns__null_from_invalid_localpart_chars(void** state);
 void jid_create__returns__null_from_empty_parts(void** state);
 void jid_create__returns__null_from_multiple_at_in_bare(void** state);