feat: oauth support: add oauth2 related classes#225
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kalenkevich merged 7 commits intomainfrom Apr 1, 2026
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LGTM with some comments
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- PKCE (Proof Key for Code Exchange) - CSRF (State Parameter) - Mix-Up attacks - SSRF via Discovery - Token Storage (XSS)
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Summary
This PR introduces the core infrastructure for OAuth2 support in the TypeScript ADK. It implements metadata discovery (RFC 8414 and RFC 9728), credential exchange, and token refreshing, along with comprehensive unit tests for each component.
These additions lay the groundwork for full OAuth2 authentication flows within the ADK.
Changes Made
Core Components
oauth2_discovery.ts
OAuth2DiscoveryManager: Implements OAuth 2.0 Authorization Server Metadata (RFC 8414) and OAuth 2.0 Protected Resource Metadata (RFC 9728) discovery..well-knownendpoints for both Authorization Servers and Protected Resources.issuerorresourcematches the target URL, defending against mix-up attacks.oauth2_credential_exchanger.ts
OAuth2CredentialExchanger: Handles exchangingclient_credentialsandauthorization_codefor access tokens.AuthCredentialobjects.oauth2_credential_refresher.ts
OAuth2CredentialRefresher: Automatically checks for token expiration and refreshes OAuth2 credentials using refresh tokens.oauth2_utils.ts