utils/utils.py

"""
Copyright 2025 Google LLC

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""

from utils.a2a_types import (
    JSONRPCResponse,
    ContentTypeNotSupportedError,
    UnsupportedOperationError,
)
from typing import List


def are_modalities_compatible(
    server_output_modes: List[str], client_output_modes: List[str]
):
    """Modalities are compatible if they are both non-empty
    and there is at least one common element."""
    if client_output_modes is None or len(client_output_modes) == 0:
        return True

    if server_output_modes is None or len(server_output_modes) == 0:
        return True

    return any(x in server_output_modes for x in client_output_modes)


def new_incompatible_types_error(request_id):
    return JSONRPCResponse(id=request_id, error=ContentTypeNotSupportedError())


def new_not_implemented_error(request_id):
    return JSONRPCResponse(id=request_id, error=UnsupportedOperationError())