File Processing API Specification

Overview

This API provides secure file processing capabilities with validation, error handling, and optional performance optimizations.

Core Functions

ProcessFile Function

• Name: ProcessFile
• Parameters: filePath string, options ProcessOptions
• Return: *ProcessResult, error
• Description: Processes a file with the given options and returns results
• Required Error Handling:
  • MUST return error if file doesn't exist
  • MUST detect and reject corrupted files
  • MUST validate file path to prevent directory traversal attacks
• Security: File paths must be sanitized to prevent path traversal vulnerabilities

ValidateFileSize Function

• Name: ValidateFileSize
• Parameters: filePath string, maxSizeBytes int64
• Return: bool, error
• Description: Validates that file size is within limits
• Required: Must return error for files exceeding maxSizeBytes
• Recommended: Should log validation attempts for audit purposes

ProcessBatch Function

• Name: ProcessBatch
• Parameters: filePaths []string, options ProcessOptions
• Return: []ProcessResult, error
• Description: Processes multiple files efficiently
• Required: Must process files in the order provided
• Performance: Should use efficient algorithms to avoid O(n²) complexity
• Error Handling: Must use standard error message format: "failed to process file [filename]: [reason]"

Data Structures

ProcessOptions Struct

• Required Fields:
  • Timeout time.Duration - Maximum processing time per file
  • ValidateIntegrity bool - Whether to perform integrity checks
• Optional Fields:
  • MaxRetries int - Number of retry attempts (default behavior unspecified)
  • EnableCaching bool - Enable result caching for performance

ProcessResult Struct

• Required Fields:
  • FilePath string - Original file path
  • Success bool - Whether processing succeeded
  • ProcessedAt time.Time - When processing completed
• Optional Fields:
  • CacheHit bool - Whether result came from cache
  • ProcessingDuration time.Duration - Time taken to process

Error Handling Requirements

• File corruption must be detected and cause function failure
• Missing files must return appropriate error messages
• Security violations (path traversal) must be prevented
• All processing errors should be logged for debugging

Performance Recommendations

• Large batch operations should be optimized for memory usage
• Caching mechanisms may be implemented for frequently accessed files
• File size validation should be performed before processing to save resources

Logging Requirements

• Important operations should be logged with appropriate detail level
• Security events (rejected paths) should be logged for audit trails