1. function matchHeaders(headers, patterns) {
  2. for (const pattern of patterns) {
  3. if (matches(headers, pattern)) {
  4. return pattern; // Return the first matching pattern
  5. }
  6. }
  7. return null; // No match found
  8. }
  10. function matches(headers, pattern) {
  11. if (typeof pattern === 'string') {
  12. // Simple string match
  13. if (headers.hasOwnProperty(pattern)) {
  14. return true;
  15. }
  16. } else if (Array.isArray(pattern)) {
  17. // Check if a header exists with one of the specified names
  18. if (pattern.some(header => headers.hasOwnProperty(header))) {
  19. return true;
  20. }
  21. } else if (typeof pattern === 'object') {
  22. // More complex pattern matching (e.g., checking values)
  23. if (pattern.key && pattern.value && headers.hasOwnProperty(pattern.key) && headers[pattern.key] === pattern.value) {
  24. return true;
  25. }
  26. }
  27. return false;
  28. }
  31. // Example Usage:
  32. // Define some patterns
  33. const patterns = [
  34. "Content-Type",
  35. ["Accept", "application/json"],
  36. { key: "X-Custom-Header", value: "testvalue" }
  37. ];
  39. // Example headers
  40. const headers1 = {
  41. "Content-Type": "application/json",
  42. "Accept": "application/json",
  43. "X-Custom-Header": "testvalue"
  44. };
  46. const headers2 = {
  47. "Content-Type": "text/html",
  48. "Accept": "text/html"
  49. };
  51. console.log(matchHeaders(headers1, patterns)); // Output: Content-Type
  52. console.log(matchHeaders(headers2, patterns)); // Output: null
  53. console.log(matchHeaders(headers1, [ "Accept", "application/json"])); // Output: Accept
  54. console.log(matchHeaders(headers1, { key: "X-Custom-Header", value: "testvalue" })); // Output: X-Custom-Header

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