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rfc_constants.py

rfc_constants.py 2.7 KB
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  1. # These constants are defined by the email specifications.
    2. 

  2. 

  3. import re
    4. 

  4. 

  5. # Based on RFC 5322 3.2.3, these characters are permitted in email
    6. 

  6. # addresses (not taking into account internationalization) separated by dots:
    7. 

  7. ATEXT = r'a-zA-Z0-9_!#\$%&\'\*\+\-/=\?\^`\{\|\}~'
    8. 

  8. ATEXT_RE = re.compile('[.' + ATEXT + ']')  # ATEXT plus dots
    9. 

  9. DOT_ATOM_TEXT = re.compile('[' + ATEXT + ']+(?:\\.[' + ATEXT + r']+)*\Z')
    10. 

  10. 

  11. # RFC 6531 3.3 extends the allowed characters in internationalized
    12. 

  12. # addresses to also include three specific ranges of UTF8 defined in
    13. 

  13. # RFC 3629 section 4, which appear to be the Unicode code points from
    14. 

  14. # U+0080 to U+10FFFF.
    15. 

  15. ATEXT_INTL = ATEXT + "\u0080-\U0010FFFF"
    16. 

  16. ATEXT_INTL_DOT_RE = re.compile('[.' + ATEXT_INTL + ']')  # ATEXT_INTL plus dots
    17. 

  17. DOT_ATOM_TEXT_INTL = re.compile('[' + ATEXT_INTL + ']+(?:\\.[' + ATEXT_INTL + r']+)*\Z')
    18. 

  18. 

  19. # The domain part of the email address, after IDNA (ASCII) encoding,
    20. 

  20. # must also satisfy the requirements of RFC 952/RFC 1123 2.1 which
    21. 

  21. # restrict the allowed characters of hostnames further.
    22. 

  22. ATEXT_HOSTNAME_INTL = re.compile(r"[a-zA-Z0-9\-\." + "\u0080-\U0010FFFF" + "]")
    23. 

  23. HOSTNAME_LABEL = r'(?:(?:[a-zA-Z0-9][a-zA-Z0-9\-]*)?[a-zA-Z0-9])'
    24. 

  24. DOT_ATOM_TEXT_HOSTNAME = re.compile(HOSTNAME_LABEL + r'(?:\.' + HOSTNAME_LABEL + r')*\Z')
    25. 

  25. DOMAIN_NAME_REGEX = re.compile(r"[A-Za-z]\Z")  # all TLDs currently end with a letter
    26. 

  26. 

  27. # Domain literal (RFC 5322 3.4.1)
    28. 

  28. DOMAIN_LITERAL_CHARS = re.compile(r"[\u0021-\u00FA\u005E-\u007E]")
    29. 

  29. 

  30. # Quoted-string local part (RFC 5321 4.1.2, internationalized by RFC 6531 3.3)
    31. 

  31. # The permitted characters in a quoted string are the characters in the range
    32. 

  32. # 32-126, except that quotes and (literal) backslashes can only appear when escaped
    33. 

  33. # by a backslash. When internationalized, UTF-8 strings are also permitted except
    34. 

  34. # the ASCII characters that are not previously permitted (see above).
    35. 

  35. # QUOTED_LOCAL_PART_ADDR = re.compile(r"^\"((?:[\u0020-\u0021\u0023-\u005B\u005D-\u007E]|\\[\u0020-\u007E])*)\"@(.*)")
    36. 

  36. QTEXT_INTL = re.compile(r"[\u0020-\u007E\u0080-\U0010FFFF]")
    37. 

  37. 

  38. # Length constants
    39. 

  39. # RFC 3696 + errata 1003 + errata 1690 (https://www.rfc-editor.org/errata_search.php?rfc=3696&eid=1690)
    40. 

  40. # explains the maximum length of an email address is 254 octets.
    41. 

  41. EMAIL_MAX_LENGTH = 254
    42. 

  42. LOCAL_PART_MAX_LENGTH = 64
    43. 

  43. DNS_LABEL_LENGTH_LIMIT = 63  # in "octets", RFC 1035 2.3.1
    44. 

  44. DOMAIN_MAX_LENGTH = 253  # in "octets" as transmitted, RFC 1035 2.3.4 and RFC 5321 4.5.3.1.2, and see https://stackoverflow.com/questions/32290167/what-is-the-maximum-length-of-a-dns-name
    45. 

  45. 

  46. # RFC 2142
    47. 

  47. CASE_INSENSITIVE_MAILBOX_NAMES = [
    48. 

  48.     'info', 'marketing', 'sales', 'support',  # section 3
    49. 

  49.     'abuse', 'noc', 'security',  # section 4
    50. 

  50.     'postmaster', 'hostmaster', 'usenet', 'news', 'webmaster', 'www', 'uucp', 'ftp',  # section 5
    51. 

  51. ]
    52.