1. import re
  3. def validate_request_headers(headers, expected_headers):
  4. """
  5. Sorts request headers and performs validation checks with fallback logic.
  7. Args:
  8. headers (dict): A dictionary of request headers.
  9. expected_headers (dict): A dictionary of expected headers and their values.
  11. Returns:
  12. dict: A dictionary containing validation results for each expected header.
  13. Keys are header names, and values are dictionaries with 'valid' (bool) and 'value' (str).
  14. Returns None if headers is not a dictionary or expected_headers is not a dictionary.
  15. """
  17. if not isinstance(headers, dict) or not isinstance(expected_headers, dict):
  18. return None
  20. sorted_headers = dict(sorted(headers.items())) # Sort headers alphabetically
  22. results = {}
  23. for header_name, expected_value in expected_headers.items():
  24. if header_name in sorted_headers:
  25. actual_value = sorted_headers[header_name]
  27. # Basic validation: Check if the header exists and matches the expected value.
  28. if actual_value == expected_value:
  29. results[header_name] = {'valid': True, 'value': actual_value}
  30. else:
  31. # Fallback logic: Allow for variations in case (e.g., "Content-Type" vs "content-type")
  32. if expected_value.lower() in actual_value.lower(): #Case-insensitive comparison
  33. results[header_name] = {'valid': True, 'value': actual_value}
  34. else:
  35. results[header_name] = {'valid': False, 'value': actual_value}
  36. else:
  37. # Header is missing. Consider it invalid.
  38. results[header_name] = {'valid': False, 'value': None}
  39. return results

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