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processing/normalize_domain.py

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  1. """Domain normalization: URLs/domains -> normalized registrable form."""
  3. from __future__ import annotations
  5. import re
  6. import unicodedata
  8. # common multi-part public suffixes (small pragmatic list; full PSL is a
  9. # Phase-2 upgrade via publicsuffix2)
  10. MULTI_SUFFIXES = {
  11. "co.uk", "org.uk", "ac.uk", "gov.uk", "ltd.uk", "plc.uk",
  12. "com.au", "net.au", "org.au", "co.nz", "net.nz", "org.nz",
  13. "co.jp", "ne.jp", "or.jp", "ac.jp",
  14. "com.br", "com.mx", "com.ar", "com.co", "com.pe",
  15. "com.tr", "com.cn", "com.tw", "com.hk", "com.sg", "com.my",
  16. "co.in", "co.za", "com.pl", "com.ua", "co.kr", "com.vn",
  17. "com.ph", "com.gr", "co.il", "com.pt", "com.es", "com.se",
  18. "co.at", "or.at", "ac.at", "com.hr", "com.ee",
  19. }
  22. def normalize_domain(raw: str | None) -> str | None:
  23. """Return lowercase registrable-format domain (host) from a URL/domain."""
  24. if not raw or not isinstance(raw, str):
  25. return None
  26. s = raw.strip().lower()
  27. if "://" in s:
  28. s = s.split("://", 1)[1]
  29. s = s.split("/", 1)[0].split("?", 1)[0].split("#", 1)[0]
  30. if "@" in s:
  31. s = s.rsplit("@", 1)[1]
  32. s = s.split(":", 1)[0] # strip port
  33. s = s.rstrip(".")
  34. s = unicodedata.normalize("NFKC", s)
  35. if not s or " " in s:
  36. return None
  37. if "xn--" in s:
  38. try:
  39. decoded = s.encode("ascii").decode("idna")
  40. s = decoded.lower()
  41. except Exception:
  42. pass
  43. if not re.fullmatch(r"[a-z0-9\.\-]+", s):
  44. return None
  45. if s.startswith("www.") and len(s) > len("www."):
  46. s = s[len("www."):]
  47. return s or None
  50. def root_domain(domain: str | None) -> str | None:
  51. """Registrable root domain (eTLD+1, pragmatic suffix list)."""
  52. if not domain:
  53. return None
  54. parts = domain.split(".")
  55. if len(parts) >= 3 and ".".join(parts[-2:]) in MULTI_SUFFIXES:
  56. return ".".join(parts[-3:])
  57. return ".".join(parts[-2:]) if len(parts) >= 2 else domain
  60. def is_punycode(domain: str | None) -> bool:
  61. return bool(domain) and "xn--" in domain.lower()