Configure Multer Middleware for Secure File Uploads

[tomaszlt]

Configure Multer Middleware for Secure File Uploads

Description

Task

Install and configure multer for file upload handling

Acceptance Criteria

• Secure multer middleware implemented
• File uploads restricted to specific types
• Maximum file size of 5MB enforced
• Unique filename generation
• Uploads directory automatically created

Summary of Work

Multer Configuration for Secure File Uploads

Changes Implemented

• Created comprehensive multer middleware for file upload handling
• Configured secure file storage with unique filename generation
• Implemented strict file type and size restrictions
• Set up automatic uploads directory creation

Implementation Details

Storage Configuration

• Uses multer.diskStorage for local file storage
• Generates unique filenames using:
  • Current timestamp
  • Cryptographically secure random bytes
• Stores files in an 'uploads' directory

File Filtering

• Restricts file uploads to specific MIME types:
  • Images: JPEG, PNG, GIF
  • Documents: PDF, Plain Text
• Prevents uploading of potentially harmful file types

Upload Limitations

• Maximum file size: 5MB
• Single file per upload
• Unique filename to prevent overwriting

Security Considerations

• Uses crypto.randomBytes() for secure filename generation
• Validates file types before storage
• Limits file size to prevent potential DoS attacks
• Creates uploads directory with recursive option

Testing Approach

• Comprehensive unit tests covering:
  • Storage configuration
  • File size limits
  • Upload file count
  • Uploads directory creation
  • File type validation

Notes

• Future improvements could include cloud storage integration
• Consider adding more granular file type controls if needed

Changes Made

• Created src/multer-config.ts with comprehensive multer configuration
• Implemented secure file storage with unique filename generation
• Added file type and size restrictions
• Created automatic uploads directory creation
• Added multer configuration test suite in src/multer-config.test.ts

Tests

• Verify storage configuration is correct
• Confirm 5MB file size limit
• Ensure single file upload limitation
• Check uploads directory creation
• Validate allowed and rejected file types

Signatures

Staking Key

AjM47QweoJapLGFM8hzA8fKNmhGgswaztoXzJvXpGELr: AJE5AZ7wx5MZsoxGj7TYtX22yANHLTB1RF4BwxPao1Dbu6w3iaN8dP6z6ZE8dJxYn6qfh6xYb2tWJGiSs9sKS7KPXhvUyePX1973v35EBoV1dAihDuJ6LHykv6FN2fR2gQmzSYiFN7qLGgF5MUPyXB6hQ5dYQWhQgMo2kKgho6YbxZrcd19rpXyoRw42EkTu2Fy5VGk1TZFWN8te1kiy4yFBc7H1MxouHXgVm2rZEb2ThysXfY1PT1JDNvgjznDVihZQcpRZ8t6CmA29nDkCUGP66nDVcuBuv9KLzVqcUjWjwLUu9cqAELBqrtsN6LHq8JEorVoRiriMvUMdjYVDZCDMzdxU192tzF98ZvFUkQkS8XpSb7S3Sk4cvz3LFREjtJx1tFND6onkqCDVvZCg9PDADW9MmvSNpk

Public Key

HBFHRca7xjSidvQ1WLdeo7pT449dEjNgiZeR5sRNr6H4: Krbz1bBEwvgqs7W5ih4EK7r1C44cSpbgt3ALJtctMsvuVLtPvEqgkX9xTndA9fCp6emSy1EzGeak2aNfmceo79vE7w2JxT7VsKr7dB9BvMTtt8UaauGCySQ5fYUXyUxY3yrD2WxcwebGUwELh7SL3LzVxQky5QM1oLrD6h2WoG84mknCRydXKzRZvd3Av1357Fiur6mfqFMrM5ovoD9zLdeMnGJad4fF9eCT7JwjAkrkvRwQm5XrY2zby9AHT6tcLNYJi9WHYUxkf8iERUn6GqBxUJozyzjk147MozhLtmeXXsGvpaCMggsMzwKUG4btdQo4APGxnaDTsWL29a9gNSUWcFVAPHNxwrYvkq8FqypCvEEdJKRTVfyjcnc1m2HQ9bTsyBzLpFwrq75cABnaCsaWXojusZFJRz