1. const fs = require('fs');
  2. const zlib = require('zlib');
  4. /**
  5. * Decodes a file input for an isolated environment with rate limiting.
  6. *
  7. * @param {Buffer} fileData The file data as a Buffer.
  8. * @param {number} rateLimitMs The rate limit in milliseconds.
  9. * @returns {Promise<string>} A promise that resolves with the decoded string,
  10. * or rejects with an error.
  11. */
  12. async function decodeFile(fileData, rateLimitMs) {
  13. return new Promise((resolve, reject) => {
  14. // Rate limiting implementation
  15. let lastRequestTime = 0;
  16. const checkRateLimit = () => {
  17. const now = Date.now();
  18. if (now - lastRequestTime >= rateLimitMs) {
  19. lastRequestTime = now;
  20. } else {
  21. setTimeout(checkRateLimit, 10); // Check again later
  22. }
  23. };
  24. checkRateLimit();
  26. // Decode the file data
  27. zlib.gunzip(fileData, (err, buffer) => {
  28. if (err) {
  29. reject(err);
  30. return;
  31. }
  33. try {
  34. const decodedString = buffer.toString('utf8');
  35. resolve(decodedString);
  36. } catch (decodeError) {
  37. reject(decodeError);
  38. }
  39. });
  40. });
  41. }
  43. module.exports = decodeFile;

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