ADK changes

PiperOrigin-RevId: 749973427

src/google/adk/tools/openapi_tool/openapi_spec_parser/operation_parser.py

@@ -14,20 +14,12 @@
 
 import inspect
 from textwrap import dedent
-from typing import Any
-from typing import Dict
-from typing import List
-from typing import Optional
-from typing import Union
+from typing import Any, Dict, List, Optional, Union
 
 from fastapi.encoders import jsonable_encoder
-from fastapi.openapi.models import Operation
-from fastapi.openapi.models import Parameter
-from fastapi.openapi.models import Schema
+from fastapi.openapi.models import Operation, Parameter, Schema
 
-from ..common.common import ApiParameter
-from ..common.common import PydocHelper
-from ..common.common import to_snake_case
+from ..common.common import ApiParameter, PydocHelper, to_snake_case
 
 
 class OperationParser:
@@ -110,7 +102,8 @@ class OperationParser:
       description = request_body.description or ''
 
       if schema and schema.type == 'object':
-        for prop_name, prop_details in schema.properties.items():
+        properties = schema.properties or {}
+        for prop_name, prop_details in properties.items():
           self.params.append(
               ApiParameter(
                   original_name=prop_name,

src/google/adk/tools/openapi_tool/openapi_spec_parser/rest_api_tool.py

@@ -17,6 +17,7 @@ from typing import Dict
 from typing import List
 from typing import Literal
 from typing import Optional
+from typing import Sequence
 from typing import Tuple
 from typing import Union
 
@@ -59,6 +60,40 @@ def snake_to_lower_camel(snake_case_string: str):
   ])
 
 
+# TODO: Switch to Gemini `from_json_schema` util when it is released
+# in Gemini SDK.
+def normalize_json_schema_type(
+    json_schema_type: Optional[Union[str, Sequence[str]]],
+) -> tuple[Optional[str], bool]:
+  """Converts a JSON Schema Type into Gemini Schema type.
+
+  Adopted and modified from Gemini SDK. This gets the first available schema
+  type from JSON Schema, and use it to mark Gemini schema type. If JSON Schema
+  contains a list of types, the first non null type is used.
+
+  Remove this after switching to Gemini `from_json_schema`.
+  """
+  if json_schema_type is None:
+    return None, False
+  if isinstance(json_schema_type, str):
+    if json_schema_type == "null":
+      return None, True
+    return json_schema_type, False
+
+  non_null_types = []
+  nullable = False
+  # If json schema type is an array, pick the first non null type.
+  for type_value in json_schema_type:
+    if type_value == "null":
+      nullable = True
+    else:
+      non_null_types.append(type_value)
+  non_null_type = non_null_types[0] if non_null_types else None
+  return non_null_type, nullable
+
+
+# TODO: Switch to Gemini `from_json_schema` util when it is released
+# in Gemini SDK.
 def to_gemini_schema(openapi_schema: Optional[Dict[str, Any]] = None) -> Schema:
   """Converts an OpenAPI schema dictionary to a Gemini Schema object.
 
@@ -82,13 +117,6 @@ def to_gemini_schema(openapi_schema: Optional[Dict[str, Any]] = None) -> Schema:
   if not openapi_schema.get("type"):
     openapi_schema["type"] = "object"
 
-  # Adding this to avoid "properties: should be non-empty for OBJECT type" error
-  # See b/385165182
-  if openapi_schema.get("type", "") == "object" and not openapi_schema.get(
-      "properties"
-  ):
-    openapi_schema["properties"] = {"dummy_DO_NOT_GENERATE": {"type": "string"}}
-
   for key, value in openapi_schema.items():
     snake_case_key = to_snake_case(key)
     # Check if the snake_case_key exists in the Schema model's fields.
@@ -99,7 +127,17 @@ def to_gemini_schema(openapi_schema: Optional[Dict[str, Any]] = None) -> Schema:
         # Format: properties[expiration].format: only 'enum' and 'date-time' are
         # supported for STRING type
         continue
-      if snake_case_key == "properties" and isinstance(value, dict):
+      elif snake_case_key == "type":
+        schema_type, nullable = normalize_json_schema_type(
+            openapi_schema.get("type", None)
+        )
+        # Adding this to force adding a type to an empty dict
+        # This avoid "... one_of or any_of must specify a type" error
+        pydantic_schema_data["type"] = schema_type if schema_type else "object"
+        pydantic_schema_data["type"] = pydantic_schema_data["type"].upper()
+        if nullable:
+          pydantic_schema_data["nullable"] = True
+      elif snake_case_key == "properties" and isinstance(value, dict):
         pydantic_schema_data[snake_case_key] = {
             k: to_gemini_schema(v) for k, v in value.items()
         }

tests/unittests/tools/openapi_tool/openapi_spec_parser/test_operation_parser.py

@@ -164,6 +164,18 @@ def test_process_request_body_no_name():
   assert parser.params[0].param_location == 'body'
 
 
+def test_process_request_body_empty_object():
+  """Test _process_request_body with a schema that is of type object but with no properties."""
+  operation = Operation(
+      requestBody=RequestBody(
+          content={'application/json': MediaType(schema=Schema(type='object'))}
+      )
+  )
+  parser = OperationParser(operation, should_parse=False)
+  parser._process_request_body()
+  assert len(parser.params) == 0
+
+
 def test_dedupe_param_names(sample_operation):
   """Test _dedupe_param_names method."""
   parser = OperationParser(sample_operation, should_parse=False)

tests/unittests/tools/openapi_tool/openapi_spec_parser/test_rest_api_tool.py

@@ -14,11 +14,9 @@
 
 
 import json
-from unittest.mock import MagicMock
-from unittest.mock import patch
+from unittest.mock import MagicMock, patch
 
-from fastapi.openapi.models import MediaType
-from fastapi.openapi.models import Operation
+from fastapi.openapi.models import MediaType, Operation
 from fastapi.openapi.models import Parameter as OpenAPIParameter
 from fastapi.openapi.models import RequestBody
 from fastapi.openapi.models import Schema as OpenAPISchema
@@ -27,13 +25,13 @@ from google.adk.tools.openapi_tool.auth.auth_helpers import token_to_scheme_cred
 from google.adk.tools.openapi_tool.common.common import ApiParameter
 from google.adk.tools.openapi_tool.openapi_spec_parser.openapi_spec_parser import OperationEndpoint
 from google.adk.tools.openapi_tool.openapi_spec_parser.operation_parser import OperationParser
-from google.adk.tools.openapi_tool.openapi_spec_parser.rest_api_tool import RestApiTool
-from google.adk.tools.openapi_tool.openapi_spec_parser.rest_api_tool import snake_to_lower_camel
-from google.adk.tools.openapi_tool.openapi_spec_parser.rest_api_tool import to_gemini_schema
+from google.adk.tools.openapi_tool.openapi_spec_parser.rest_api_tool import (
+    RestApiTool,
+    snake_to_lower_camel,
+    to_gemini_schema,
+)
 from google.adk.tools.tool_context import ToolContext
-from google.genai.types import FunctionDeclaration
-from google.genai.types import Schema
-from google.genai.types import Type
+from google.genai.types import FunctionDeclaration, Schema, Type
 import pytest
 
 
@@ -790,13 +788,13 @@ class TestToGeminiSchema:
     result = to_gemini_schema({})
     assert isinstance(result, Schema)
     assert result.type == Type.OBJECT
-    assert result.properties == {"dummy_DO_NOT_GENERATE": Schema(type="string")}
+    assert result.properties is None
 
   def test_to_gemini_schema_dict_with_only_object_type(self):
     result = to_gemini_schema({"type": "object"})
     assert isinstance(result, Schema)
     assert result.type == Type.OBJECT
-    assert result.properties == {"dummy_DO_NOT_GENERATE": Schema(type="string")}
+    assert result.properties is None
 
   def test_to_gemini_schema_basic_types(self):
     openapi_schema = {
@@ -814,6 +812,42 @@ class TestToGeminiSchema:
     assert gemini_schema.properties["age"].type == Type.INTEGER
     assert gemini_schema.properties["is_active"].type == Type.BOOLEAN
 
+  def test_to_gemini_schema_array_string_types(self):
+    openapi_schema = {
+        "type": "object",
+        "properties": {
+            "boolean_field": {"type": "boolean"},
+            "nonnullable_string": {"type": ["string"]},
+            "nullable_string": {"type": ["string", "null"]},
+            "nullable_number": {"type": ["null", "integer"]},
+            "object_nullable": {"type": "null"},
+            "multi_types_nullable": {"type": ["string", "null", "integer"]},
+            "empty_default_object": {},
+        },
+    }
+    gemini_schema = to_gemini_schema(openapi_schema)
+    assert isinstance(gemini_schema, Schema)
+    assert gemini_schema.type == Type.OBJECT
+    assert gemini_schema.properties["boolean_field"].type == Type.BOOLEAN
+
+    assert gemini_schema.properties["nonnullable_string"].type == Type.STRING
+    assert not gemini_schema.properties["nonnullable_string"].nullable
+
+    assert gemini_schema.properties["nullable_string"].type == Type.STRING
+    assert gemini_schema.properties["nullable_string"].nullable
+
+    assert gemini_schema.properties["nullable_number"].type == Type.INTEGER
+    assert gemini_schema.properties["nullable_number"].nullable
+
+    assert gemini_schema.properties["object_nullable"].type == Type.OBJECT
+    assert gemini_schema.properties["object_nullable"].nullable
+
+    assert gemini_schema.properties["multi_types_nullable"].type == Type.STRING
+    assert gemini_schema.properties["multi_types_nullable"].nullable
+
+    assert gemini_schema.properties["empty_default_object"].type == Type.OBJECT
+    assert not gemini_schema.properties["empty_default_object"].nullable
+
   def test_to_gemini_schema_nested_objects(self):
     openapi_schema = {
         "type": "object",
@@ -895,7 +929,15 @@ class TestToGeminiSchema:
   def test_to_gemini_schema_nested_dict(self):
     openapi_schema = {
         "type": "object",
-        "properties": {"metadata": {"key1": "value1", "key2": 123}},
+        "properties": {
+            "metadata": {
+                "type": "object",
+                "properties": {
+                    "key1": {"type": "object"},
+                    "key2": {"type": "string"},
+                },
+            }
+        },
     }
     gemini_schema = to_gemini_schema(openapi_schema)
     # Since metadata is not properties nor item, it will call to_gemini_schema recursively.
@@ -903,9 +945,15 @@ class TestToGeminiSchema:
     assert (
         gemini_schema.properties["metadata"].type == Type.OBJECT
     )  # add object type by default
-    assert gemini_schema.properties["metadata"].properties == {
-        "dummy_DO_NOT_GENERATE": Schema(type="string")
-    }
+    assert len(gemini_schema.properties["metadata"].properties) == 2
+    assert (
+        gemini_schema.properties["metadata"].properties["key1"].type
+        == Type.OBJECT
+    )
+    assert (
+        gemini_schema.properties["metadata"].properties["key2"].type
+        == Type.STRING
+    )
 
   def test_to_gemini_schema_ignore_title_default_format(self):
     openapi_schema = {