feat: Added auth header to API transport#5
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Summary
POST /api/datapreviously accepted any request. This PR gates it behind a bearer JWT: the backend verifies the token on every write, and the frontend attaches one to every upload. The verification logic sits behind a single pluggable interface so adopters can swap the demo verifier for a real identity provider (Supabase, Clerk, etc.) by editing one file.How it works
The demo keeps its one-token shape: the client already fetches a PowerSync JWT from
/api/auth/tokeninfetchCredentials()for sync. Writes now reuse that same token as the bearer credential, and the backend verifies it against its own public key (the same key it signs with, exposed via a newgetPublicJwk()helper).Docs
auth-verifiers.md— adopter guide for swapping the verifier to Supabase or Clerk: worked verifier snippets, env vars, frontendgetToken()wiring, sync-token options, and a verification checklist.AI disclosure
This PR was created with the help of Claude Code. Help constitutes assistance in research, planning, and rough outline of implementation. Beyond having a hand in the implementation, I have also manually tested this work.