FRONTEND CHANGELOG | Sep 01 - Sep 12 | 22 hours

API Client Architecture (Complete HTTP Layer Implementation)

Core API Client Infrastructure

A comprehensive API client system was implemented to handle all HTTP communication with the Node.js backend:

ApiClient Class:

• Centralized Dio-based HTTP client with configurable timeouts and base URL management
• Generic request() method supporting all HTTP methods with consistent error handling
• Convenience methods (get, post, put, delete, patch) with endpoint method validation
• Path parameter substitution via requestWithPathParams() for dynamic URLs
• Proper resource cleanup with close() method

Interceptor Chain (Order-Dependent):

1. AuthInterceptor - Automatic Bearer token injection and proactive token refresh
2. TokenRefreshInterceptor - Reactive 401 handling with automatic retry
3. ApiLoggingInterceptor - Comprehensive request/response logging with sensitive data marking
4. ErrorHandlingInterceptor - Status code-specific error handling and logging
5. RetryInterceptor - Exponential backoff retry for transient failures

API Endpoints & Exception Handling

ApiEndpoints Class: Static endpoint definitions with metadata including HTTP method, authentication requirements, timeout configuration, and descriptions. Currently defines health check, authentication endpoints (send-code, verify-code, refresh-token), with structured placeholder for future endpoints.

Exception Hierarchy: Custom ApiException base class with specialized subclasses:

• NetworkException - Connectivity issues and timeouts
• HTTP status-specific exceptions: BadRequestException (400), UnauthorizedException (401), ForbiddenException (403), NotFoundException (404), TooManyRequestsException (429), ServerException (5xx)
• RequestCancelledException and UnknownException for edge cases
• Smart error message extraction from API responses with validation error array handling

Authentication Services (Token Management System)

Token Storage Service

TokenStorageService: Secure token persistence using FlutterSecureStorage with automatic JSON serialization:

• AuthTokenData model for structured token storage (accessToken, refreshToken, expiresAt)
• Atomic operations for storing/retrieving authentication data
• Secure token removal with error handling
• Platform-specific secure storage integration

Token Refresh Service

TokenRefreshService: Automated JWT refresh management:

• Proactive refresh 5 minutes before expiry via ensureValidToken()
• Reactive refresh on 401 responses with concurrent request handling
• Retry logic with exponential backoff (3 attempts, 2-8-16 second delays)
• Thread-safe refresh with Completer to prevent duplicate refresh requests
• Automatic cleanup of invalid refresh tokens

Authentication Service Enhancements

AuthService Updates:

• Full integration with API client and token services
• Structured error handling with user-friendly messages
• Email validation with comprehensive regex patterns
• Automatic token refresh integration
• Router refresh notifications for navigation state updates

Project Management Feature (Workspace System)

Domain Models

ProjectModel: Complete project entity with:

• UUID-based identification and workspace association
• Intelligent abbreviation generation from project names (handles camelCase, spaces, special characters)
• Timestamp tracking (created, updated, lastViewed)
• JSON serialization support with fromJson/toJson
• Comprehensive equality and hashing implementation

Services & State Management

ProjectsService: Business logic layer for project operations:

• Project creation with name validation and abbreviation generation
• Recent projects tracking with view count management
• Project switching with state persistence
• Mock data generation for development

ProjectsStore: Riverpod-based state management:

• Current project tracking with automatic initialization
• Recent projects list with timestamp-based sorting
• Loading states and error handling
• Integration with navigation and UI components

UI Components

CreateProjectDialog: Modal dialog for project creation:

• Real-time name validation and abbreviation preview
• Form validation with comprehensive error messaging
• Responsive design with proper focus management
• Integration with projects service for creation workflow

ProjectSelector: Advanced dropdown with overlay system:

• Custom overlay positioning with LayerLink
• Keyboard navigation support (Escape to close)
• Current project display with abbreviation badges
• Recent projects list with quick switching
• “Show all” and “Create new” action integration

Navigation & UI Modernization

New Navigation Components

MorePopupButton: Consolidated settings menu replacing individual buttons:

• PopupMenuButton with theme switching, navigation (hotkeys, roadmap), and logout
• Conditional icon display based on current theme mode
• Consistent styling with Material symbols integration

LogoutNavButton: Dedicated logout component:

• Confirmation dialog with proper error state styling
• Hover effects with error color theming
• Responsive icon sizing and text overflow handling

Navigation Rail Improvements

• Replaced multiple individual action buttons with consolidated MorePopupButton
• Updated project selector integration with new workspace system
• Improved layout spacing and component organization

Infrastructure & Configuration Updates

Application Configuration

AppConfig Enhancements:

• appBarSize configuration (replacing appBarHeight)
• Environment-specific configuration loading
• Platform channel integration for configuration management

Provider Architecture

New Providers:

• apiClientProvider - Managed API client lifecycle
• tokenStorageServiceProvider - Secure token storage service
• tokenRefreshServiceProvider - Automated token refresh
• apiClientManagerProvider - API client cleanup management
• authServiceProvider - Enhanced authentication service

Routing & State Management

RouterRefreshNotifier: Auth state change listener for navigation updates:

• Integration with authentication service
• Automatic route refresh on auth state changes
• Proper cleanup and listener management

Utility & Framework Updates

Fractional Indexing Implementation

FractionalIndexing Class: Advanced ordering system for list management:

• Character-based fractional positioning between existing items
• Midpoint calculation for insertion operations
• Boundary handling for prepend/append operations
• Comprehensive validation and error handling

BACKEND CHANGELOG | Sep 01 - Sep 12 | 28 hours

Authentication System Overhaul

Enhanced Authentication Flow

Controller Restructuring:

• Renamed /auth/submit-email to /auth/send-code for clearer API semantics
• Updated authentication flow to handle both existing users (login) and new users with invitations (registration)
• Integrated @Public() decorator on entire AuthController to bypass JWT requirements for auth endpoints
• Comprehensive Swagger/OpenAPI documentation with detailed request/response schemas

JWT Token Refresh System:

• New /auth/refresh endpoint for secure token renewal
• RefreshTokenDto with validation for client refresh token requests
• Automatic generation of both new access and refresh tokens
• Integration with security metadata tracking (user agent, IP address)

Security Infrastructure

JWT Authentication Guard:

• JwtAuthGuard implemented as global guard protecting all routes by default
• @Public() decorator allows selective bypass for authentication endpoints
• JwtStrategy for Passport.js integration with configurable JWT verification
• @CurrentUser() decorator for clean user context extraction in controllers

Token Management:

• RefreshToken entity with comprehensive security fields (expiration, revocation, user agent, IP tracking)
• Secure token storage with cascade deletion on user removal
• Revocation system for compromised or expired refresh tokens
• Database relationship management with proper foreign key constraints

Authentication Service Enhancements

Service Architecture:

• Refactored AuthService with dependency injection for WorkspaceService and ProjectService
• Enhanced authenticate() method replacing submitEmail() for unified login/registration flow
• Automatic default workspace and project creation for new users
• refreshToken() method with comprehensive validation and token lifecycle management
• Updated user tracking with lastLoginAt timestamp

Project & Workspace Management System

Domain Models

Project Entity:

• Complete CRUD entity extending BaseEntity for standardized ID/timestamp management
• Workspace and user association with proper TypeORM relationships
• Name and description fields with length constraints and nullable handling
• Database schema with proper indexing and foreign key relationships

Workspace Entity:

• Multi-tenant workspace system with user ownership
• One-to-many relationship with projects for proper data isolation
• Extensible architecture for future multi-user workspace features
• Consistent with project entity patterns for maintainability

Project Management API

ProjectController: Full RESTful API implementation:

• POST /projects - Project creation with workspace validation
• GET /projects - List projects with workspace filtering and pagination support
• GET /projects/:id - Single project retrieval with ownership validation
• PUT /projects/:id - Project updates with authorization checks
• DELETE /projects/:id - Project deletion with cascade considerations

Data Transfer Objects:

• CreateProjectDto with comprehensive validation rules
• UpdateProjectDto using PartialType for flexible updates
• ProjectResponseDto with standardized response formatting
• Input validation using class-validator decorators

Service Layer Architecture

ProjectService: Business logic implementation:

• Project creation with workspace existence validation
• User authorization checks preventing cross-tenant access
• Database transaction handling for data consistency
• Error handling with appropriate HTTP status codes

WorkspaceService: Workspace management:

• Default workspace creation during user registration
• Workspace naming conventions based on user email
• Future-proofed for multi-workspace per user functionality

Database Architecture & Infrastructure

Entity Relationships

Enhanced User Entity:

• Added lastLoginAt field for authentication tracking
• Maintained backward compatibility with existing user data
• Proper relationships with workspaces and projects

Base Entity Pattern:

• Centralized BaseEntity with UUID primary keys and timestamp management
• Consistent across Project and Workspace entities
• Extensible foundation for future domain models

Authentication Data Models

Invitation System:

• Invitation entity for managing user registration approval
• Email-based invitation validation with status tracking
• Integration with authentication flow for seamless user onboarding

Verification Code System:

• Enhanced VerificationCode entity with consistent code length validation
• Temporal validation for code expiration handling
• Secure code generation and storage patterns

Application Architecture

Module Organization

Enhanced App Module:

• Global JWT authentication guard registration
• Integration of ProjectModule and WorkspaceModule
• Maintainence of existing rate limiting and database configurations

Authentication Module:

• Passport.js integration with JWT strategy
• Service dependency injection for cross-module communication
• Proper module encapsulation with clear service boundaries

Project Module:

• Complete module setup with controller, service, and repository patterns
• TypeORM repository integration for database operations
• Clean separation of concerns following NestJS best practices

Infrastructure Improvements

Database Configuration:

• Updated data source configuration for new entities
• Migration support for schema evolution
• Proper entity registration and relationship mapping

Global Exception Handling:

• Consistent error response formatting across all endpoints
• HTTP status code standardization
• Security-conscious error message exposure