fix: fix nested one of field handling for protobuf schema dependency …

…verification

karapace/protobuf/schema.py

@@ -164,7 +164,10 @@ def _process_nested_type(
 
         if isinstance(element_type, MessageElement):
             for one_of in element_type.one_ofs:
-                process_one_of(verifier, package_name, parent_name, one_of)
+                # The parent name for nested one of fields is the parent and element type name.
+                # The field type name is handled in process_one_of function.
+                one_of_parent_name = parent_name + "." + element_type.name
+                process_one_of(verifier, package_name, one_of_parent_name, one_of)
             for field in element_type.fields:
                 verifier.add_used_type(parent_name, field.element_type)
         for nested_type in element_type.nested_types:

tests/unit/protobuf/test_dependency.py

@@ -0,0 +1,114 @@
+"""
+Copyright (c) 2023 Aiven Ltd
+See LICENSE for details
+"""
+from karapace.protobuf.kotlin_wrapper import trim_margin
+from karapace.protobuf.schema import ProtobufSchema
+
+
+def test_nested_field_one_of_dependency():
+    """The nested field may contain nested messages that are referred with one of restriction.
+    This test is for regression when used types are added and parent name did not include correctly
+    the nested `Foo`.
+    The full used type is `.test.FooVal.Foo.Bar`.
+    """
+    proto = """
+      |syntax = "proto3";
+      |package test;
+      |
+      |option java_multiple_files = true;
+      |option java_string_check_utf8 = true;
+      |option java_outer_classname = "FooProto";
+      |option java_package = "test";
+      |
+      |// Comment
+      |message FooKey {
+      |  // Comment
+      |  string field_a = 1;
+      |
+      |}
+      |
+      |// Comment
+      |message FooVal {
+      |  // Comment
+      |  repeated Foo field_a = 1;
+      |
+      |  // Comment
+      |  string field_b = 2;
+      |
+      |  // Comment
+      |  message Foo {
+      |
+      |    // Comment
+      |    message Bar {
+      |      // Comment
+      |      string field_b = 1;
+      |    }
+      |
+      |    // Comment
+      |    message Bee {
+      |    }
+      |
+      |    // Comment
+      |    oneof packaging {
+      |      // Comment
+      |      Bar field_h = 2;
+      |
+      |      // Comment
+      |      Bee field_i = 3;
+      |    }
+      |  }
+      |}
+    """
+    proto = trim_margin(proto)
+    pbschema = ProtobufSchema(schema=proto, references=(), dependencies=())
+    deps = pbschema.verify_schema_dependencies()
+    assert deps.result, "Dependencies verification failed."
+
+
+def test_one_of_dependency():
+    proto = """
+      |syntax = "proto3";
+      |package test;
+      |
+      |option java_multiple_files = true;
+      |option java_string_check_utf8 = true;
+      |option java_outer_classname = "FooProto";
+      |option java_package = "test";
+      |
+      |// Comment
+      |message FooKey {
+      |  // Comment
+      |  string field_a = 1;
+      |
+      |}
+      |
+      |// Comment
+      |message FooVal {
+      |  // Comment
+      |  string field_b = 1;
+      |
+      |  // Comment
+      |  message Bar {
+      |    // Comment
+      |    string field_b = 1;
+      |  }
+      |
+      |  // Comment
+      |  message Bee {
+      |  }
+      |
+      |  // Comment
+      |  oneof packaging {
+      |    // Comment
+      |    Bar field_h = 2;
+      |
+      |    // Comment
+      |    Bee field_i = 3;
+      |  }
+      |}
+    """
+    proto = trim_margin(proto)
+    pbschema = ProtobufSchema(schema=proto, references=(), dependencies=())
+    deps = pbschema.verify_schema_dependencies()
+    assert deps.result, "Dependencies verification failed."