🔐 User Authentication & Remember Me Flow

How users register, log in with persistent "Remember Me" sessions, refresh tokens, and access protected resources.

JWT Token Lifecycle & Remember Me

Access token TTL defaults to 60 minutes (config: Jwt:ExpiryMinutes). Refresh token TTL defaults to 7 days (config: Jwt:RefreshExpiryDays).

When a user enables Remember Me during login:

• The backend extends the refresh token cookie lifespan to 30 days.
• The frontend stores remembered_username in localStorage to automatically pre-fill returning user credentials.
• Refresh tokens are stored as httpOnly cookies (Secure on HTTPS, SameSite=None for HTTPS/localhost).

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Token Refresh Flow

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Registration Flow

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JWT Token Claims

{
  "sub": "00000000-0000-0000-0000-000000000001",
  "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name": "admin",
  "http://schemas.microsoft.com/ws/2008/06/identity/claims/role": "Admin",
  "jti": "unique-token-id",
  "iss": "InventoryAlert.Api",
  "aud": "InventoryAlert.UI",
  "exp": 1713000000
}

Claim	Purpose
sub	User ID (Guid) — used by all services to scope data access
name	Username — displayed in UI
role	User or Admin — controls endpoint authorization
exp	Token expiry — controlled by Jwt:ExpiryMinutes (default 60 minutes)
iss / aud	Validated on every request when configured (Jwt:Issuer, Jwt:Audience)

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Authorization Levels

Endpoint	Required
POST /api/v1/auth/login, POST /api/v1/auth/register, POST /api/v1/auth/refresh	[Public] — no token needed
All other endpoints	[Authorize] — valid JWT required
POST /api/v1/stocks/sync, GET/POST /api/v1/events/*	[Authorize(Roles = "Admin")]
GET /api/v1/market/status	[AllowAnonymous] — explicitly public

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Security Considerations

• Passwords are hashed with BCrypt.
• Access token delivered in JSON body; refresh token in httpOnly cookie — not accessible to JavaScript.
• Refresh tokens are rotated on each refresh call (revocation/deny-list can be added if strict single-use is required).
• All sensitive config (Jwt:Key, Database:ConnectionString, Finnhub:ApiKey) lives in appsettings.*.json which is gitignored. Only appsettings.Example.json is committed.