auto">This PR implements a comprehensive frontend infrastructure with role-based authentication for the SDLC Core system. The implementation provides a complete web-based user management system with secure authentication, granular access control, and a modern responsive interface.

Key Features Implemented

🔐 Authentication System

Secure User Registration & Login: Complete user account management with bcrypt password hashing
Session Management: Flask-Login integration for secure session handling
CSRF Protection: Built-in protection against cross-site request forgery attacks
Password Security: Strong password validation and secure storage

👥 Role-Based Access Control (RBAC)

5 Default Roles: admin, user, moderator, analyst, developer with clear permission boundaries
Flexible Decorators: Easy-to-use @require_role(), @admin_required, @login_required decorators
Runtime Permission Checking: Dynamic role validation in both templates and backend views
Multi-role Support: Users can be assigned multiple roles for complex permission scenarios

🌐 Modern Web Interface

Responsive Design: Bootstrap 5 framework with mobile-first responsive design
Professional UI: Clean, modern interface with icons, animations, and intuitive navigation
User Dashboard: Comprehensive profile management with role information and quick actions
Admin Panel: Full-featured administrative interface for user and role management

🔌 REST API Endpoints

Complete API implementation for programmatic access:

POST /auth/api/login - User authentication with JSON response
GET /auth/api/user/profile - User profile information
GET /api/admin/users - User management (admin only)
GET /api/admin/roles - Role management (admin only)

All endpoints include proper HTTP status codes, error handling, and JSON responses.

Technical Implementation

Architecture

The implementation follows Flask's application factory pattern with modular components:

from src.frontend.decorators import require_role, login_required

@require_role('developer')
def deploy_agent():
    # Only developers can deploy agents
    pass

@require_role('analyst') 
def generate_report():
    # Only analysts can generate reports
    pass

Database Models

User Model: Handles authentication, profile data, and role relationships
Role Model: Defines available roles with descriptions
UserRole Model: Many-to-many relationship mapping for flexible role assignment

Security Features

✅ Bcrypt password hashing for secure password storage
✅ CSRF token protection for all forms
✅ Secure session management with Flask-Login
✅ Server-side role validation for all protected routes
✅ Configurable security settings for different environments

Screenshots

Home Page

Login Interface

User Dashboard

Admin Panel

Quick Start

# Install dependencies
pip install -r requirements.txt

# Start the application
cd src/frontend
python app.py

# Access at http://localhost:5000
# Default admin: admin / admin123

Integration Ready

The frontend infrastructure is designed for seamless integration with existing SDLC Core components. It provides authentication decorators that can be used throughout the system to protect LLM endpoints, agent deployments, analytics functions, and other sensitive operations based on user roles.

The system includes comprehensive documentation (src/frontend/README.md and FRONTEND_INTEGRATION.md) with examples for integrating authentication into existing components.

Fixes #4.

Setting up Frontend Infrastructure for Role & Authentication #4

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