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Authentication

Guest anonymous access

Anonymous Firebase accounts are created from several entry points when no user exists, with TTL fields for guest profiles.

Implemented Verified from source User-facing

In one sentence

signInAnonymously() is used from profile completion and some repositories.

Current behavior

ProfileInfoScreen creates an anonymous user if needed before writing profile fields. Nutrition and quota services can also ensure auth. Anonymous TTL is refreshed via UserRepository.

Current state

Implemented but multi-entry (not centralized). Verified-from-source.

Status

Status: Implemented
Verification: Verified from source
Updated: 2026-07-23
Facing: User-facing

Trigger

User skips auth during onboarding or a service needs a Firebase uid.

Data read or written

Reads: None.

Writes: None.

Files involved

lib/core/auth/auth_service.dart High impact

Dependencies

Depends on: Firebase authentication

Depended on by: Onboarding profile and goals

Related diagrams

Appears as a node in:

Auth providers · Onboarding and authentication flow

Related rationale

Anonymous auth created from multiple call sites