Simple app login flow, works multi-tenant too

[sanjarcode]

// States (4) // Login <--> Reopen app <--> appInInvalidState? <--> Logout <--> Login

1. Login - store relevant values.Simple.
2. Reopen app - reuse stored values. Simple.
3. Logout - clear memory. Simple.
4. appInInvalidState. Detect invalid values
   • validate_token
   • check if api_subdomain, domain are invalid or missing.
   • if anything is invalid, clear the storage and go to login screen.

• Backend needs an extra endpoint for multiple tenant (in addition to sign_in). A single polymorphic (forgiving) function that takes email, or parsed stuff (subdomain) from url (web).
• for mobile, mandate email. Since url UI is absent.
• works for user 1-N tenants too. Show tenant choosing screen.

Holds for any spa. The above being multi tenant.