1. <?php
  3. /**
  4. * Loads request headers for hypothesis validation, with error logging.
  5. *
  6. * @param array $headers The request headers array.
  7. * @param array $requiredHeaders An array of required header names.
  8. * @param array $allowedValues An array of allowed values for specific headers (optional).
  9. * @param string $logFile The file to log errors to.
  10. * @return array|false An array of validated headers, or false on failure.
  11. */
  12. function validateRequestHeaders(array $headers, array $requiredHeaders, array $allowedValues = [], string $logFile = 'header_validation.log'): array|false
  13. {
  14. $validatedHeaders = [];
  15. $errors = [];
  17. // Log function
  18. function logError(string $message) use ($logFile) {
  19. error_log($message, 3, $logFile); // Log to file
  20. }
  22. // Check required headers
  23. foreach ($requiredHeaders as $headerName) {
  24. if (!isset($headers[$headerName])) {
  25. logError("Missing required header: " . $headerName);
  26. $errors[] = "Missing required header: " . $headerName;
  27. } else {
  28. $validatedHeaders[$headerName] = $headers[$headerName];
  29. }
  30. }
  32. // Check allowed values for specific headers
  33. if (!empty($allowedValues)) {
  34. foreach ($allowedValues as $headerName => $allowedValuesArray) {
  35. if (isset($headers[$headerName])) {
  36. if (!in_array($headers[$headerName], $allowedValuesArray)) {
  37. logError("Invalid value for header: " . $headerName . ". Allowed values: " . implode(", ", $allowedValuesArray) . ", Received: " . $headers[$headerName]);
  38. $errors[] = "Invalid value for header: " . $headerName . ". Allowed values: " . implode(", ", $allowedValuesArray) . ", Received: " . $headers[$headerName];
  39. } else {
  40. $validatedHeaders[$headerName] = $headers[$headerName];
  41. }
  42. }
  43. }
  44. }
  47. if (!empty($errors)) {
  48. logError("Header validation failed: " . implode(", ", $errors));
  49. return false; // Return false if any errors occurred
  50. }
  52. return $validatedHeaders;
  53. }
  55. ?>

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