fix(sandbox): Route forwarded provider egress#369
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Use Vercel Sandbox forwarded request headers as the credential egress boundary instead of routing provider traffic through a path-carried sandbox id. The proxy now verifies the sandbox OIDC token, uses its sandbox_id for the command-scoped egress session, and reconstructs upstream requests from forwarded host metadata plus the original path. Update the egress tests and specs to match the forwarded-request contract. Fixes #366 Co-authored-by: GPT-5 Codex <[email protected]>
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Drop the unused helper that described the old route-bound egress check. The proxy now uses the verified Vercel Sandbox OIDC sandbox_id as the active egress session key, so keeping the old helper made the security model look split across two paths. Refs GH-366 Co-Authored-By: GPT-5 Codex <[email protected]>
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Route sandbox provider egress through Junior’s forwarded-request handler instead of a path-specific internal route. Vercel Sandbox preserves the upstream path, so provider API calls now reach the proxy before normal app routes and use the signed sandbox OIDC claim to find the command-scoped credential session.
Forwarded Request Handling
The sandbox network policy forwards declared provider domains to the app root. The egress handler verifies Vercel OIDC, derives the session from
sandbox_id, reconstructs the upstream URL from forwarded metadata and the original path, and applies existing provider header transforms.Contracts
Update sandbox egress tests and credential policy docs to remove the route-carried sandbox id assumption.
Fixes #366