1. /**
  2. * Attaches metadata to text files for sandbox usage with a timeout.
  3. *
  4. * @param {string} filePath The path to the text file.
  5. * @param {object} metadata The metadata to attach. Should be a plain JavaScript object.
  6. * @param {number} timeout The timeout in milliseconds.
  7. * @returns {Promise<boolean>} A promise that resolves if the metadata was attached successfully,
  8. * or rejects if an error occurred.
  9. */
  10. async function attachMetadataToTextFile(filePath, metadata, timeout) {
  11. return new Promise((resolve, reject) => {
  12. const startTime = Date.now();
  14. const fs = require('fs').promises; // Use promises-based fs API
  16. fs.readFile(filePath, 'utf-8')
  17. .then(fileContent => {
  18. // Construct the metadata string. Use a JSON string for simplicity.
  19. const metadataString = JSON.stringify(metadata);
  21. // Replace a placeholder in the file with the metadata string.
  22. const updatedContent = fileContent.replace(
  23. /METADATA_PLACEHOLDER/g, // Placeholder to denote where metadata will be inserted
  24. metadataString
  25. );
  27. // Write the updated content back to the file.
  28. return fs.writeFile(filePath, updatedContent, 'utf-8');
  29. })
  30. .then(() => {
  31. // File written successfully.
  32. resolve(true);
  33. })
  34. .catch(err => {
  35. // Handle file writing errors.
  36. console.error(`Error writing to file: ${err}`);
  37. reject(err);
  38. })
  39. .finally(() => {
  40. // Check for timeout.
  41. if (Date.now() - startTime > timeout) {
  42. console.warn('Metadata attachment timed out.');
  43. reject(new Error('Metadata attachment timed out.'));
  44. }
  45. });
  46. });
  47. }
  49. module.exports = attachMetadataToTextFile;

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