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Rainer Koschnick
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# User Management - Requirements Document
## Introduction
The User Management system extends the existing bookmark manager to support multiple users with individual accounts. This system provides user registration, authentication, and secure bookmark storage per user account. The feature transforms the application from a client-side tool to a full-stack web application with backend services and database persistence.
## Requirements
### Requirement 1: User Registration
**User Story:** As a new user, I want to create an account with email and password, so that I can have my own private bookmark collection.
#### Acceptance Criteria
1. WHEN a user visits the registration page THEN the system SHALL display a registration form with email, password, and confirm password fields
2. WHEN a user submits registration form THEN the system SHALL validate email format and password strength requirements
3. WHEN password validation occurs THEN the system SHALL require minimum 8 characters with at least one uppercase, lowercase, number, and special character
4. WHEN email validation occurs THEN the system SHALL check for valid email format and uniqueness in the database
5. WHEN registration is successful THEN the system SHALL create a new user account and send a verification email
6. WHEN registration fails THEN the system SHALL display specific error messages for validation failures
7. WHEN a user clicks the verification link THEN the system SHALL activate the account and redirect to login page
### Requirement 2: User Authentication
**User Story:** As a registered user, I want to log in and log out securely, so that I can access my personal bookmark collection.
#### Acceptance Criteria
1. WHEN a user visits the login page THEN the system SHALL display a login form with email and password fields
2. WHEN a user submits valid credentials THEN the system SHALL authenticate the user and create a secure session
3. WHEN authentication is successful THEN the system SHALL redirect the user to their bookmark dashboard
4. WHEN authentication fails THEN the system SHALL display an error message without revealing whether email or password was incorrect
5. WHEN a user clicks "Forgot Password" THEN the system SHALL send a password reset email to the registered email address
6. WHEN a user clicks "Logout" THEN the system SHALL terminate the session and redirect to the login page
7. WHEN a user session expires THEN the system SHALL automatically redirect to login page with session timeout message
### Requirement 3: Password Management
**User Story:** As a user, I want to reset my password and change it when logged in, so that I can maintain account security.
#### Acceptance Criteria
1. WHEN a user requests password reset THEN the system SHALL send a secure reset link valid for 1 hour
2. WHEN a user clicks a valid reset link THEN the system SHALL display a new password form
3. WHEN a user submits a new password THEN the system SHALL validate password strength and update the account
4. WHEN a logged-in user accesses account settings THEN the system SHALL provide a change password option
5. WHEN changing password THEN the system SHALL require current password verification before allowing change
6. WHEN password is successfully changed THEN the system SHALL invalidate all existing sessions except the current one
7. WHEN reset link is used or expires THEN the system SHALL invalidate the reset token
### Requirement 4: User Profile Management
**User Story:** As a user, I want to manage my profile information, so that I can keep my account details current.
#### Acceptance Criteria
1. WHEN a user accesses profile settings THEN the system SHALL display current profile information including email and account creation date
2. WHEN a user updates their email THEN the system SHALL require email verification before making the change
3. WHEN a user requests account deletion THEN the system SHALL require password confirmation and display data deletion warning
4. WHEN account deletion is confirmed THEN the system SHALL permanently delete user data and all associated bookmarks
5. WHEN a user updates profile THEN the system SHALL validate all changes before saving
6. WHEN profile update fails THEN the system SHALL display specific error messages for each validation failure
###
Requirement 5: Bookmark Data Isolation
**User Story:** As a user, I want my bookmarks to be private and separate from other users, so that my data remains secure and personal.
#### Acceptance Criteria
1. WHEN a user logs in THEN the system SHALL load only bookmarks associated with their user account
2. WHEN a user performs bookmark operations THEN the system SHALL ensure all operations are scoped to their user ID
3. WHEN bookmark data is stored THEN the system SHALL associate each bookmark with the authenticated user's ID
4. WHEN bookmark data is retrieved THEN the system SHALL filter results to only include the current user's bookmarks
5. WHEN a user logs out THEN the system SHALL clear all bookmark data from the client-side application
6. WHEN API requests are made THEN the system SHALL validate user authentication and authorization for all bookmark operations
### Requirement 6: Session Management
**User Story:** As a user, I want my login session to be secure and manageable, so that my account remains protected.
#### Acceptance Criteria
1. WHEN a user logs in THEN the system SHALL create a secure session with configurable timeout (default 24 hours)
2. WHEN a user is inactive for extended period THEN the system SHALL warn before session expiration
3. WHEN session expires THEN the system SHALL automatically log out the user and clear sensitive data
4. WHEN a user logs in from multiple devices THEN the system SHALL allow concurrent sessions with individual management
5. WHEN a user changes password THEN the system SHALL optionally invalidate all other sessions
6. WHEN suspicious activity is detected THEN the system SHALL require re-authentication
7. WHEN session data is stored THEN the system SHALL use secure, httpOnly cookies with appropriate security flags
### Requirement 7: Database Integration
**User Story:** As a system administrator, I want user and bookmark data stored securely in a database, so that data persists reliably across sessions and server restarts.
#### Acceptance Criteria
1. WHEN the system starts THEN it SHALL connect to a configured database (PostgreSQL or MySQL)
2. WHEN user data is stored THEN the system SHALL use proper database schemas with appropriate indexes
3. WHEN passwords are stored THEN the system SHALL hash them using bcrypt with appropriate salt rounds
4. WHEN database operations occur THEN the system SHALL use parameterized queries to prevent SQL injection
5. WHEN database connections are made THEN the system SHALL use connection pooling for performance
6. WHEN database errors occur THEN the system SHALL log errors appropriately without exposing sensitive information
7. WHEN data is queried THEN the system SHALL implement proper pagination for large datasets
### Requirement 8: API Security
**User Story:** As a developer, I want the API endpoints to be secure and properly authenticated, so that user data remains protected from unauthorized access.
#### Acceptance Criteria
1. WHEN API endpoints are accessed THEN the system SHALL require valid authentication tokens
2. WHEN authentication tokens are issued THEN the system SHALL use JWT tokens with appropriate expiration
3. WHEN API requests are made THEN the system SHALL validate token signature and expiration
4. WHEN API responses are sent THEN the system SHALL include appropriate security headers
5. WHEN API errors occur THEN the system SHALL return appropriate HTTP status codes without exposing system details
6. WHEN rate limiting is needed THEN the system SHALL implement per-user rate limits to prevent abuse
7. WHEN CORS is configured THEN the system SHALL allow only authorized origins
### Requirement 9: Data Migration
**User Story:** As an existing user of the client-side bookmark manager, I want to import my existing bookmarks into my new account, so that I don't lose my bookmark collection.
#### Acceptance Criteria
1. WHEN a new user registers THEN the system SHALL offer an option to import existing bookmarks from localStorage
2. WHEN importing from localStorage THEN the system SHALL validate and migrate bookmark data to the user's account
3. WHEN migration is successful THEN the system SHALL display confirmation of imported bookmark count
4. WHEN migration fails THEN the system SHALL provide error details and allow retry
5. WHEN a user has existing server-side bookmarks THEN the system SHALL offer merge or replace options during import
6. WHEN bookmark import completes THEN the system SHALL optionally clear localStorage data after confirmation
### Requirement 10: Error Handling and Logging
**User Story:** As a system administrator, I want comprehensive error handling and logging, so that I can monitor system health and troubleshoot issues.
#### Acceptance Criteria
1. WHEN system errors occur THEN the system SHALL log errors with appropriate detail level without exposing sensitive data
2. WHEN user authentication fails THEN the system SHALL log failed attempts for security monitoring
3. WHEN database operations fail THEN the system SHALL log errors and provide graceful degradation
4. WHEN API requests fail THEN the system SHALL return appropriate error responses with helpful messages
5. WHEN critical errors occur THEN the system SHALL notify administrators through configured channels
6. WHEN logs are generated THEN the system SHALL rotate logs and maintain appropriate retention policies
7. WHEN debugging is needed THEN the system SHALL provide configurable log levels for different components