mcpkit

The project implements OAuth 2.1 with PKCE, Dynamic Client Registration (DCR), and Protected Resource Metadata (RFC 9728, 8414, 7591, 7636). It utilizes cryptographically secure token generation (`crypto/rand`) and constant-time comparisons (`crypto/subtle`) for sensitive operations. A critical open URL redirect vulnerability (CWE-601) in the `isValidRedirectURI` function was identified and promptly fixed in v0.3.1, demonstrating a proactive approach to security. The `oauth2.Config` allows for basic authentication via a `Users` map, which requires careful management of credentials by the implementer, though a custom `Authenticator` can be provided for more robust solutions. `ngrok` integration requires a securely managed `NGROK_AUTHTOKEN`.