Adrien
6.4 KiB
Feature Specification: Basic Login Protection
Feature Branch: 003-basic-login
Created: 2026-04-06
Status: Draft
Input: User description: "Add simple and basic login (username and password) to protect the app."
User Scenarios & Testing (mandatory)
User Story 1 - Authenticate to Access the App (Priority: P1)
A user opens the application and is presented with a login screen. They enter their username and password and, upon successful authentication, gain access to the full application. Without logging in, no part of the application is accessible.
Why this priority: This is the core feature — all other functionality depends on this gate being in place.
Independent Test: Can be fully tested by navigating to any page without credentials (should redirect to login), then logging in with valid credentials (should grant access) — this alone delivers the full MVP value.
Acceptance Scenarios:
- Given an unauthenticated user, When they navigate to any page of the app, Then they are redirected to the login screen
- Given the login screen, When the user enters valid credentials and submits, Then they are redirected to the application home/dashboard
- Given the login screen, When the user enters invalid credentials and submits, Then an error message is displayed and they remain on the login screen
- Given an authenticated user, When they navigate directly to a protected page, Then they can access it without re-authenticating
User Story 2 - Log Out of the App (Priority: P2)
An authenticated user can explicitly log out of the application, terminating their session. After logging out, they are redirected to the login screen and must re-authenticate to access the app.
Why this priority: Logout is essential for security — especially on shared machines — but the app is still protected even without explicit logout (session expires).
Independent Test: Can be fully tested by logging in, clicking logout, and confirming that the protected pages are no longer accessible.
Acceptance Scenarios:
- Given an authenticated user, When they click the logout button, Then their session is terminated and they are redirected to the login screen
- Given a user who has logged out, When they navigate to a protected page, Then they are redirected to the login screen
User Story 3 - Session Persistence Across Browser Refresh (Priority: P3)
An authenticated user refreshes the page or reopens the browser tab and remains logged in without having to re-enter credentials, as long as their session has not expired.
Why this priority: Improves usability — users should not be forced to log in after every page refresh during normal use.
Independent Test: Can be tested by logging in, refreshing the page, and confirming the user is still authenticated.
Acceptance Scenarios:
- Given an authenticated user, When they refresh the browser, Then they remain logged in and on the same page
- Given a session that has expired, When the user tries to access a protected page, Then they are redirected to the login screen
Edge Cases
- What happens when the login form is submitted with empty username or password fields?
- How does the system handle a user whose credentials are removed/disabled while they have an active session?
- What happens if the user attempts to access the login page while already authenticated?
- How does the system behave if the session store becomes unavailable?
Requirements (mandatory)
Functional Requirements
- FR-001: System MUST display a login screen (username + password fields and submit button) to unauthenticated users
- FR-002: System MUST redirect unauthenticated users attempting to access any protected page to the login screen
- FR-003: System MUST validate submitted credentials against configured or stored credentials
- FR-004: System MUST create an authenticated session upon successful login
- FR-005: System MUST display a clear, user-friendly error message when credentials are incorrect (without revealing which field is wrong)
- FR-006: System MUST provide a logout action that terminates the active session
- FR-007: System MUST redirect users to the login screen after logout
- FR-008: System MUST prevent login form submission when username or password is empty
- FR-009: System MUST automatically expire sessions after a reasonable inactivity period
- FR-010: System MUST redirect users to the login page if their session has expired
- FR-011: Credentials MUST be stored securely (passwords hashed, not stored in plaintext)
- FR-012: System MUST allow at least one user account to be configured via environment variables or a configuration file; credential changes take effect on restart
Key Entities
- User Account: Represents a person who can authenticate; has a username (unique identifier) and a hashed password
- Session: Represents an active authenticated context; linked to a user account, has an expiry time
Success Criteria (mandatory)
Measurable Outcomes
- SC-001: Unauthenticated users cannot access any protected page — 100% of protected routes redirect to login
- SC-002: Users can complete the login flow (enter credentials, submit, land on the app) in under 30 seconds under normal conditions
- SC-003: Invalid login attempts display an error within 3 seconds and do not reveal which field was wrong
- SC-004: Authenticated sessions persist across page refreshes for the configured session duration without requiring re-authentication
- SC-005: Logout terminates the session immediately — any subsequent request to a protected page results in a redirect to login
Assumptions
- The target users are a small, known group — there is no public self-registration for new accounts
- A single set of credentials (or a small number of pre-configured accounts) is sufficient for this initial version
- Mobile/responsive design for the login form is expected but full mobile optimization is not the focus of this feature
- The app currently has no authentication layer, so this will be added globally
- Session duration defaults to a reasonable inactivity timeout (e.g., 30 minutes of inactivity), configurable if needed
- A "remember me" / persistent login cookie is out of scope for this initial implementation