Implement Error Handling Middleware for File Not Found Scenarios

[gapcomputer]

Implement Error Handling Middleware for File Not Found Scenarios

Description

Task

Create middleware to handle file not found errors with appropriate error responses

Acceptance Criteria

• Middleware handles file not found errors
• Returns 404 status code
• Provides generic error message
• Supports custom error throwing

Summary of Work

Overview

This pull request implements a robust error handling middleware for file not found scenarios in our CDN file serving application, enhancing error management and providing a consistent error response mechanism.

Changes Made

• Created fileNotFoundMiddleware to handle file not found errors
• Implemented custom FileNotFoundError class for precise error typing
• Added comprehensive error response for file not found scenarios

Implementation Details

Middleware Components

1. fileNotFoundMiddleware

   • Catches errors with the name 'FileNotFoundError'
   • Returns a 404 status code with a generic, secure error message
   • Passes non-file-not-found errors to the next error handler

2. FileNotFoundError

   • Custom error class extending base Error
   • Allows explicit typing of file not found errors
   • Sets a consistent error name for middleware detection

Security Considerations

• Uses a generic error message to prevent information disclosure
• Provides a standardized error response mechanism
• Allows for future expansion of error handling strategies

Testing Approach

• Verifies correct error response for file not found scenarios
• Ensures middleware correctly identifies and handles file not found errors
• Validates that other error types are passed to subsequent error handlers

Notes

• Middleware is type-safe and follows TypeScript best practices
• Easy to integrate with existing Express.js error handling patterns

Changes Made

• Created src/middleware/file-not-found.middleware.ts
• Implemented fileNotFoundMiddleware function
• Added FileNotFoundError custom error class
• Ensured secure and generic error response

Tests

• Verify 404 status code for file not found errors
• Check error message does not reveal system details
• Confirm custom error class works as expected
• Validate error handling for different error scenarios

Signatures

Staking Key

GaAX5SsXwQtnAZpYuM8xiQy6jT6y45ZwceSDM44YmRDC: 5GQwM7J7vBjp6s8XamB55GTEr88HP3Qa75EZsiBRZW3xeV8C22YHjHufWZ1Mjf6pd8Kt46L13XsmQZdMqCD9mWU2r89ciabQg7z83QQi7ArFbkvTp2fDv6HTstEMhTV3At9btkjCohDCRmD3cXsboqP7Q9ddDkvfwuGwbtY1rX7Knq3Rtj8ioQ3ajgygo6cMvjZXYtjZwdkHVqQ4RkqBQMewr4oKb5bset4WoMbKt1bYcyHXXFRs7sPqykL6ftSfX2cT7x4tYUZPGH65wBviQYvrBy578UjnwoYVF6RwgXAsXeqNiFVjHVMmkQWAqGDCwoFVbqgjoHCfH6WfdrmGPYsxidyMCPeQw7wQS7NycFx4HfcS1pYdqV6RXPfRJKZJx6MPezr4negNg6utGmZUE7dLk8yrf2oKefJW8

Public Key

HUqT8zPGT5GXD98yLtdhg35nBeSMJgZoHW26vXQkDe7o: 7MY7StnRg1yVMARDMSa9LAiXcgcCEoXjY5k4pFot5wLDa1JTChFE2MzUwt7XhXS8TbN2nKLNUQypQ2D1svgm3jSzKQzzjaYvDEhV9D3vzdvymBK8KHj2Jij9kaxgCQpjphQ6c3voGP9wMhTAmvCMANmTqrpz33sqac8bkY2CpHXMG9uwibiiqawHkJkAekDdNYjAJ8ehAz5LSQP1xgTEzwmiwrR24fiTCF8A7SnET8aZqchm7Xgxvprd2aCW2ZnnKsvp4rQbPS1YvtbqSCCfcvXDyKTupSJkdoKe1MUj2nJWs8VRAq2HzZDa9yXGuQCkwkdU3s56TXnSSHQGbQq7ua5THHySeewx12WLih4PCLgWd2DiRbiGfgHV462dPjpoeHQrC6VZZXLwh5C2Pnc5oAxxXNRuoHhKJJbHW