1. <?php
  3. /**
  4. * Token Retry Logic (Development Only)
  5. *
  6. * This script provides a basic retry mechanism for authentication tokens.
  7. * It's intended for development and testing purposes only and should not
  8. * be used in production environments without proper security considerations.
  9. */
  11. /**
  12. * Function to attempt to refresh/retry an authentication token.
  13. * @param string $token The authentication token.
  14. * @param callable $refreshFunction A function that handles token refreshing.
  15. * @param int $maxRetries The maximum number of retry attempts.
  16. * @param int $retryDelay The delay in seconds between retries.
  17. * @return string|false The refreshed token on success, or false on failure.
  18. */
  19. function retryToken(string $token, callable $refreshFunction, int $maxRetries = 3, int $retryDelay = 5): string|false
  20. {
  21. $retries = 0;
  23. while ($retries < $maxRetries) {
  24. try {
  25. // Attempt to refresh the token
  26. $newToken = $refreshFunction($token);
  28. if ($newToken) {
  29. return $newToken; // Success!
  30. } else {
  31. $retries++;
  32. if ($retries < $maxRetries) {
  33. sleep($retryDelay); // Wait before retrying
  34. } else {
  35. // Max retries reached.
  36. error_log("Token refresh failed after $maxRetries attempts.");
  37. return false;
  38. }
  39. }
  40. } catch (Exception $e) {
  41. $retries++;
  42. if ($retries < $maxRetries) {
  43. sleep($retryDelay); // Wait before retrying
  44. } else {
  45. error_log("Token refresh failed due to exception: " . $e->getMessage());
  46. return false;
  47. }
  48. }
  49. }
  51. return false; // Should not reach here if logic is correct, but added for completeness.
  52. }
  54. /**
  55. * Example refresh function (replace with your actual logic)
  56. * @param string $token The token to refresh.
  57. * @return string|false The refreshed token or false on failure.
  58. */
  59. function exampleRefresh(string $token): string|false
  60. {
  61. // Basic input validation
  62. if (empty($token)) {
  63. error_log("Invalid token provided.");
  64. return false;
  65. }
  67. // Simulate token refresh logic
  68. // In a real application, this would interact with your authentication server.
  69. if (strpos($token, 'invalid') !== false) {
  70. error_log("Simulated token refresh failure.");
  71. return false;
  72. }
  74. // Simulate a successful refresh
  75. return 'new_token_value';
  76. }
  79. // Example Usage (Development)
  80. $initialToken = 'invalid_token'; // Replace with your initial token
  82. $refreshedToken = retryToken($initialToken, 'exampleRefresh');
  84. if ($refreshedToken) {
  85. echo "Token refreshed successfully: " . $refreshedToken . "\n";
  86. } else {
  87. echo "Token refresh failed.\n";
  88. }
  90. ?>

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