Implement JWT Authentication Middleware for Secure Route Protection

[HermanKoii]

Implement JWT Authentication Middleware for Secure Route Protection

Description

Task

Develop middleware to validate JWT tokens for protected routes

Acceptance Criteria

• Middleware must extract and validate JWT tokens
• Reject requests without valid authentication tokens
• Attach decoded user information to request object
• Handle token expiration and invalid token scenarios
• Provide clear error messages for different authentication failures
• Ensure type-safe user information extension
• Pass all implemented test cases

Summary of Work

This pull request implements a robust JWT authentication middleware to secure routes and validate user tokens.

Key Implementation Details

Authentication Middleware Features

• Token extraction from Authorization header
• Comprehensive token validation
• Detailed error handling for different token scenarios
• Secure token verification using environment-based secret key
• User information attachment to request object

Security Considerations

• Validates token presence and format
• Handles expired and invalid tokens
• Provides clear, secure error responses
• Uses environment-based secret key management
• Extends Express Request interface for type-safe user information

Error Handling Scenarios

• No token provided (401 Unauthorized)
• Invalid token format (401 Unauthorized)
• Expired token (401 Unauthorized with specific message)
• Invalid token signature (401 Unauthorized)
• Unexpected authentication errors (500 Internal Server Error)

Testing Strategy

• Comprehensive unit tests covering various authentication scenarios
• Mock request and response objects for isolated testing
• Validates middleware behavior for different token states
• Ensures proper error responses and next() function calls

Changes Made

• Implemented authMiddleware in src/middleware/authMiddleware.ts
• Added token validation logic
• Created custom AuthenticationError class
• Extended Express Request interface for type safety
• Implemented comprehensive error handling
• Added tests in tests/authMiddleware.test.ts to validate middleware functionality

Tests

• Validate middleware rejects requests without token
• Verify middleware handles invalid token formats
• Test successful token validation
• Check middleware behavior with expired tokens
• Ensure user information is correctly attached to request object

Signatures

Staking Key

G79TK8ccVx11JCsStBY85thohoSCm5eDwACAVju4z7bj: XRT2jW4mptVsUMjiCawXNtF1V1feF19Bd2aaByaiMWowsrkSgZTQWSTYnT7G6uMm49hcBJy2sgtcyeWVcVQEJmHbuYsXnfsmLrWHiLnVyNty1haYqMDK3vzZRSb6GmcaFTuFxh8Ga93F2S6kXLJ8XuadYqG5TP6tQ5rG35wimJc6FdcLtP9gcXS37yLMtCoNiZPHoFgCcLuKUKjtSuBPw9NQBNQrBNCFryFyniTjPSVrKwX9c2gEqNB7Khov37tjLiZgywWVnVHVjDrKivHnYeMe556Hf17ZvdjV26QCpVmH1zUUBmRSEbY82AUejCzVq5GZmg487r3bVcyPUN9HXjQVBe56PQWyLpG28BpwBk2zA7xJBm7XKTeGbUW3RZ98V9dVRqtEZumdrqSP49UBjX3ShpUz8G1f5n

Public Key

3Zfb8hhM5g8ZC7nqNKELNBByLSP56s6gqGNc8RWB6PgP: 6nGoyjX66b4LocyYNTGEayipWzejene7YtimoQF4qwMJ6NF6U8enS358hTrNYgADDpnWvryB7cPx19UKzeNi2BnhcQzomqWSjc7Z5BFRoRZXG3niFQ6G7iohHr1WadGt9rdDwaddkWQKEdySAqSi9orQacddMAuMLMR2EaSetN5jrgwTwiQQYWZoYH8LjaoALVHjyKpw252LBF5688jDniEAiznDjiqT2RWGahCH28emTcFFztuepiK4M75sJs4CJ8u2bKnw8YHLm5JZWPta2SjDxBbARdRZzjYex3D156Sx165dgkQXsuJP1HJY1DCon1r6oDJsqjUmqLbpYTCUXra5XjqJHB8MmE8QJmv5o6MxdMKDdUCgpgG5Pm2EuebvspRPFy7dFHiSu2N4oztZkLn95DH3K5Cbm6