Add a Consent Screen to Your OIDC Authorization Server with Hono

To implement a consent flow in an OAuth 2.0 authorization server, you need to ensure that the user is prompted for their consent before issuing an authorization code or access tokens. Here's how you can integrate this into your existing setup:

Step-by-Step Implementation

1. Update parseAuthorizationRequest Callback:

   • This callback needs to parse the request and extract necessary parameters like client ID, scope, etc.
   • Additionally, it should handle session cookies if present.

2. Update generateAuthorizationCode Callback:

   • If the user has already given consent (user.consentStatus === "allow"), proceed with generating an authorization code.
   • If the user has denied consent (user.consentStatus === "deny"), return a denial message.
   • If the user hasn't decided yet, prompt them for consent.

3. Update generateAccessToken Callback:

   • Similar to generateAuthorizationCode, check if the user has given consent before issuing an access token.

4. Handle Consent UI:

   • When the user's consent status is undefined or needs confirmation, redirect the user to a consent screen.
   • After the user confirms their choice (allow/d

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