feat(totp): add TOTP enrollment, management, and step-up#48
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Wrap the auth API's TOTP surface in the React SDK. The headless client gains getTotpStatus, startTotpEnrollment, verifyTotpEnrollment, and disableTotp for enrollment/management, plus verifyStepUpWithTotp(code) for TOTP-based step-up. AuthProvider/useAuth expose verifyStepUpWithTotp(code), which refreshes stepUpStatus on success alongside the existing passkey step-up helpers. The StepUpMethod type now includes 'totp', and TotpStatus and TotpEnrollmentStartResult are exported. TOTP applies to step-up verification, not to login: the auth API issues a full session on the first factor and does not gate login on TOTP. Requires a backend exposing the /totp/* routes (@seamless-auth/express 0.6+). Adds client and provider tests, README docs, and a changeset.
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Summary
Wraps the auth API's TOTP (authenticator app) surface in the React SDK. Previously the API supported TOTP fully but the SDK exposed none of it. Scoped to what the API supports today: enrollment, management, and TOTP-based step-up verification.
TOTP is not wired as a login second factor, because the auth API issues a full session on the first factor and does not gate login on TOTP. (See the discussion in the review — adding login-gating would require API changes plus recovery/backup codes to avoid hard lockout.)
Headless client (
createSeamlessAuthClient)getTotpStatus(): Promise<Response>startTotpEnrollment(): Promise<Response>— returnssecret+otpauthUrlverifyTotpEnrollment(code): Promise<Response>disableTotp(code): Promise<Response>verifyStepUpWithTotp(code): Promise<StepUpVerificationResult>(typed, like the passkey step-up helpers)Provider (
AuthProvider/useAuth)verifyStepUpWithTotp(code)— refreshesstepUpStatuson success, mirroringverifyStepUpWithPasskey.Types
StepUpMethodnow includes'totp'.TotpStatusandTotpEnrollmentStartResult.Tests / docs
stepUpStatus.npm run lintclean,npm run buildsucceeds, TOTP symbols present indist/index.d.ts.Dependency
Requires an auth backend exposing
/totp/*. That surface is added in seamless-auth-server#47 (@seamless-auth/express0.6+). Merge/release that first.