feat: two-factor authentication with QR code#7
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Premium users can enable 6-digit TOTP (RFC 6238 / SHA-1 / 30s) on their
account. New twofactor package implements generation and verification
inline (no extra dependency) and is covered by the RFC reference test
vectors.
Setup flow:
POST /user/2fa/setup → secret + otpauth:// URI (not yet enabled)
POST /user/2fa/enable → verify code, flip enabled flag
POST /user/2fa/disable → require valid code, clear secret
Login flow change:
GET /auth/verify → if 2FA enabled, returns
{ two_factor_required: true, pending_token }
instead of an api_key
POST /auth/2fa/verify → exchange pending_token + TOTP code for the
real api_key
Pending tokens are stored under the __pending2fa__ sentinel with a
5-minute server-side TTL. Disable still requires a current code so a
stolen api key can't quietly drop the second factor.
Account page renders three states (off, setup pending with secret +
URI for QR, on with disable form). verify.astro renders a code prompt
when the magic-link response signals 2FA. Four locales translated.
Adds qrcode npm dep and a small QRCode.svelte component that renders the otpauth:// URI as a 180px canvas. The 2FA setup card shows it side-by- side with the secret string so users can either scan with their authenticator app or copy the secret manually.
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Summary
Test plan