1. import java.io.*;
  2. import java.util.HashMap;
  3. import java.util.Map;
  5. public class HeaderMetadataAttacher {
  7. /**
  8. * Attaches metadata from a configuration file to request headers.
  9. *
  10. * @param requestHeaders A map of request headers.
  11. * @param configFilePath The path to the configuration file.
  12. * @return The updated map of request headers.
  13. * @throws IOException If an error occurs while reading the configuration file.
  14. */
  15. public static Map<String, String> attachMetadata(Map<String, String> requestHeaders, String configFilePath) throws IOException {
  17. // Load configuration from file
  18. Map<String, String> metadata = loadMetadata(configFilePath);
  20. // Merge metadata into request headers
  21. if (metadata != null) {
  22. requestHeaders.putAll(metadata); // Add new or update existing headers
  23. }
  25. return requestHeaders;
  26. }
  28. /**
  29. * Loads metadata from a configuration file.
  30. *
  31. * @param filePath The path to the configuration file.
  32. * @return A map of metadata, or null if the file cannot be loaded.
  33. * @throws IOException If an error occurs while reading the file.
  34. */
  35. private static Map<String, String> loadMetadata(String filePath) throws IOException {
  36. Map<String, String> metadata = new HashMap<>();
  38. try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
  39. String line;
  40. while ((line = reader.readLine()) != null) {
  41. String[] parts = line.split(":", 2); // Split into key and value
  42. if (parts.length == 2) {
  43. String key = parts[0].trim();
  44. String value = parts[1].trim();
  45. metadata.put(key, value);
  46. }
  47. }
  48. } catch (IOException e) {
  49. System.err.println("Error loading metadata from file: " + e.getMessage());
  50. return null; // Return null if file loading fails
  51. }
  53. return metadata;
  54. }
  56. public static void main(String[] args) {
  57. // Example usage
  58. Map<String, String> requestHeaders = new HashMap<>();
  59. requestHeaders.put("Content-Type", "application/json");
  61. String configFilePath = "metadata.config"; // Replace with your config file path
  63. try {
  64. Map<String, String> updatedHeaders = attachMetadata(requestHeaders, configFilePath);
  65. System.out.println(updatedHeaders);
  66. } catch (IOException e) {
  67. System.err.println("Error: " + e.getMessage());
  68. }
  69. }
  70. }

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