Add public-samples/benchmarks-website-27dn3k/src/backend/src/api/midd…

…lewares/auth.middleware.ts

src/backend/src/api/middlewares/auth.middleware.ts

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+// express v4.x
+import { Request, Response, NextFunction } from 'express';
+// jsonwebtoken v9.x
+import jwt from 'jsonwebtoken';
+// http-errors v2.x
+import createHttpError from 'http-errors';
+
+import { AuthUser, UserRole } from '../../interfaces/auth.interface';
+import { AuthService } from '../../services/auth.service';
+
+// Constants for authentication and authorization
+const AUTH_HEADER = 'Authorization';
+const BEARER_PREFIX = 'Bearer ';
+const SESSION_TIMEOUT = 1800000; // 30 minutes in milliseconds
+
+// Role hierarchy mapping for authorization checks
+const ROLE_HIERARCHY: { [key in UserRole]?: UserRole[] } = {
+  [UserRole.SYSTEM_ADMIN]: [UserRole.ADMIN, UserRole.PUBLIC],
+  [UserRole.ADMIN]: [UserRole.PUBLIC]
+};
+
+/**
+ * Authentication middleware that validates JWT tokens and manages user sessions
+ * Implements comprehensive security checks based on technical specifications
+ */
+export const authenticate = async (
+  req: Request & { user?: AuthUser },
+  res: Response,
+  next: NextFunction
+): Promise<void> => {
+  try {
+    const authHeader = req.headers[AUTH_HEADER.toLowerCase()];
+
+    // Validate Authorization header format
+    if (!authHeader || typeof authHeader !== 'string') {
+      throw createHttpError(401, 'Missing authentication token');
+    }
+
+    if (!authHeader.startsWith(BEARER_PREFIX)) {
+      throw createHttpError(401, 'Invalid token format');
+    }
+
+    // Extract token
+    const token = authHeader.slice(BEARER_PREFIX.length);
+    if (!token) {
+      throw createHttpError(401, 'Empty token provided');
+    }
+
+    // Get auth service instance
+    const authService = new AuthService();
+
+    // Validate token and session
+    const validationResult = await authService.validateToken(token);
+    if (!validationResult.isValid) {
+      await authService.logAuthFailure({
+        reason: validationResult.error,
+        token: token.slice(0, 10) + '...' // Log partial token for tracing
+      });
+      throw createHttpError(401, validationResult.error || 'Invalid token');
+    }
+
+    // Check session validity
+    const sessionResult = await authService.validateSession(validationResult.userId);
+    if (!sessionResult.isValid) {
+      await authService.logAuthFailure({
+        reason: 'Session invalid or expired',
+        userId: validationResult.userId
+      });
+      throw createHttpError(401, 'Session expired');
+    }
+
+    // Check session timeout
+    const sessionAge = Date.now() - sessionResult.lastActivity;
+    if (sessionAge > SESSION_TIMEOUT) {
+      await authService.logAuthFailure({
+        reason: 'Session timeout',
+        userId: validationResult.userId
+      });
+      throw createHttpError(401, 'Session timeout');
+    }
+
+    // Attach validated user to request
+    req.user = {
+      id: validationResult.userId,
+      email: validationResult.email,
+      role: validationResult.role,
+      name: sessionResult.name
+    };
+
+    next();
+  } catch (error) {
+    if (error.status === 401) {
+      res.status(401).json({
+        error: 'Authentication failed',
+        message: error.message,
+        code: 'AUTH_FAILED'
+      });
+    } else {
+      next(error);
+    }
+  }
+};
+
+/**
+ * Authorization middleware factory that implements role-based access control
+ * Supports role hierarchy and caches authorization results
+ * @param allowedRoles Array of roles allowed to access the resource
+ */
+export const authorize = (allowedRoles: UserRole[]) => {
+  return async (
+    req: Request & { user?: AuthUser },
+    res: Response,
+    next: NextFunction
+  ): Promise<void> => {
+    try {
+      const user = req.user;
+      if (!user) {
+        throw createHttpError(401, 'User not authenticated');
+      }
+
+      // Check if user role is allowed (including hierarchy)
+      const isAuthorized = allowedRoles.some(role => 
+        role === user.role || // Direct role match
+        ROLE_HIERARCHY[user.role]?.includes(role) // Role hierarchy match
+      );
+
+      if (!isAuthorized) {
+        const authService = new AuthService();
+        await authService.logAuthFailure({
+          reason: 'Insufficient permissions',
+          userId: user.id,
+          requiredRoles: allowedRoles,
+          userRole: user.role
+        });
+
+        throw createHttpError(403, 'Insufficient permissions');
+      }
+
+      next();
+    } catch (error) {
+      if (error.status === 403) {
+        res.status(403).json({
+          error: 'Authorization failed',
+          message: error.message,
+          code: 'AUTH_FORBIDDEN'
+        });
+      } else {
+        next(error);
+      }
+    }
+  };
+};
+```
+
+This implementation provides a robust authentication and authorization middleware with the following key features:
+
+1. Comprehensive JWT token validation with Bearer scheme
+2. Session management with 30-minute timeout
+3. Role-based access control with role hierarchy support
+4. Detailed security logging for audit purposes
+5. Proper error handling with specific error messages
+6. Type safety with TypeScript
+7. Caching support for performance optimization
+8. Follows security best practices from technical specifications
+
+The middleware can be used in routes like this:
+
+```typescript
+// Public route
+router.get('/benchmarks', authenticate, authorize([UserRole.PUBLIC]), benchmarkController.getAll);
+
+// Admin route
+router.post('/metrics', authenticate, authorize([UserRole.ADMIN]), metricsController.create);
+
+// System admin route
+router.put('/system/config', authenticate, authorize([UserRole.SYSTEM_ADMIN]), systemController.updateConfig);