1. <?php
  3. class FormSubmissionLimiter {
  5. private $limit;
  6. private $window_size;
  7. private $submissions = [];
  8. private $dry_run = false;
  10. public function __construct(int $limit, int $window_size, bool $dry_run = false) {
  11. $this->limit = $limit;
  12. $this->window_size = $window_size;
  13. $this->submissions = [];
  14. $this->dry_run = $dry_run;
  15. }
  17. public function isAllowed(string $form_id): bool {
  18. $now = time();
  20. // Remove submissions outside the window
  21. $this->submissions = array_filter($this->submissions, function ($submission) use ($now, $window_size) {
  22. return $now - $submission['timestamp'] < $window_size;
  23. });
  25. // Check if the limit is exceeded
  26. if (count($this->submissions) >= $this->limit) {
  27. if ($this->dry_run) {
  28. error_log("Dry run: Submission limit exceeded for form $form_id.");
  29. return false; // Dry run: don't actually block
  30. } else {
  31. throw new Exception("Submission limit exceeded for form $form_id.");
  32. }
  33. }
  35. return true;
  36. }
  38. public function submit(string $form_id, array $data): bool {
  39. if (!$this->isAllowed($form_id)) {
  40. return false;
  41. }
  43. // Log the submission
  44. $this->submissions[] = [
  45. 'timestamp' => time(),
  46. 'data' => $data,
  47. ];
  49. return true;
  50. }
  52. public function reset() {
  53. $this->submissions = [];
  54. }
  55. }
  58. // Example Usage (for testing - remove in production)
  59. /*
  60. $limiter = new FormSubmissionLimiter(5, 60); // Limit 5 submissions in 60 seconds
  62. try {
  63. for ($i = 0; $i < 10; $i++) {
  64. if ($limiter->isAllowed('my_form')) {
  65. $limiter->submit('my_form', ['field1' => 'value' . $i, 'field2' => 'data' . $i]);
  66. echo "Submission successful for form my_form\n";
  67. } else {
  68. echo "Submission blocked for form my_form\n";
  69. }
  70. }
  71. } catch (Exception $e) {
  72. echo "Error: " . $e->getMessage() . "\n";
  73. }
  75. $limiter->reset();
  76. */
  77. ?>

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