Custom Authentication Schemes-2 #1587 - 1

[adk-bot]

1. Custom Authentication Schemes

Doc file: docs/tools-custom/authentication.md

Current state:

The docs/tools-custom/authentication.md document describes standard OpenAPI authentication schemes (API Key, HTTP, OAuth2, OpenID Connect) but does not mention how to implement custom authentication schemes or that OAuth2Auth supports a nonce.

Proposed Change:

1. Add a section explaining how to define custom authentication schemes by subclassing CustomAuthScheme (ensuring type_ has a default value).
2. Explain that custom auth providers can now define a supported_auth_schemes property (returning a tuple of scheme types) on their BaseAuthProvider implementation for easier registration.
3. Mention that OAuth2Auth now includes a nonce field, which can be used to securely bind the user's session to the authorization request during OIDC flows.

Reasoning:
The framework was expanded to support non-OpenAPI standard authentication flows via CustomAuthScheme and simplified provider registration. Documenting these features empowers developers to integrate with proprietary or legacy enterprise auth systems. The nonce addition is also an important security feature for OAuth/OIDC flows.

Reference: src/google/adk/auth/auth_schemes.py

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[jcwriter74]

• Closed on Custom Authentication Schemes-1 #1587 - 1 #1588