src/frontend_service/orchestrator/langchain_tools/tools.py [46:58]:
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        if not hasattr(CREDENTIALS, "id_token"):
            # Use Compute Engine default credential
            CREDENTIALS = compute_engine.IDTokenCredentials(
                request=Request(),
                target_audience=BASE_URL,
                use_metadata_identity_endpoint=True,
            )
    if not CREDENTIALS.valid:
        CREDENTIALS.refresh(Request())
    if hasattr(CREDENTIALS, "id_token"):
        return CREDENTIALS.id_token
    else:
        return CREDENTIALS.token
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src/frontend_service/orchestrator/langgraph/tools.py [40:52]:
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        if not hasattr(CREDENTIALS, "id_token"):
            # Use Compute Engine default credential
            CREDENTIALS = compute_engine.IDTokenCredentials(
                request=Request(),
                target_audience=BASE_URL,
                use_metadata_identity_endpoint=True,
            )
    if not CREDENTIALS.valid:
        CREDENTIALS.refresh(Request())
    if hasattr(CREDENTIALS, "id_token"):
        return CREDENTIALS.id_token
    else:
        return CREDENTIALS.token
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