You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
396 lines
12 KiB
396 lines
12 KiB
5 months ago
|
from . import idnadata
|
||
|
|
import bisect
|
||
|
|
import unicodedata
|
||
|
|
import re
|
||
|
|
from typing import Union, Optional
|
||
|
|
from .intranges import intranges_contain
|
||
|
|
|
||
|
|
_virama_combining_class = 9
|
||
|
|
_alabel_prefix = b'xn--'
|
||
|
|
_unicode_dots_re = re.compile('[\u002e\u3002\uff0e\uff61]')
|
||
|
|
|
||
|
|
class IDNAError(UnicodeError):
|
||
|
|
""" Base exception for all IDNA-encoding related problems """
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
class IDNABidiError(IDNAError):
|
||
|
|
""" Exception when bidirectional requirements are not satisfied """
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
class InvalidCodepoint(IDNAError):
|
||
|
|
""" Exception when a disallowed or unallocated codepoint is used """
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
class InvalidCodepointContext(IDNAError):
|
||
|
|
""" Exception when the codepoint is not valid in the context it is used """
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
def _combining_class(cp: int) -> int:
|
||
|
|
v = unicodedata.combining(chr(cp))
|
||
|
|
if v == 0:
|
||
|
|
if not unicodedata.name(chr(cp)):
|
||
|
|
raise ValueError('Unknown character in unicodedata')
|
||
|
|
return v
|
||
|
|
|
||
|
|
def _is_script(cp: str, script: str) -> bool:
|
||
|
|
return intranges_contain(ord(cp), idnadata.scripts[script])
|
||
|
|
|
||
|
|
def _punycode(s: str) -> bytes:
|
||
|
|
return s.encode('punycode')
|
||
|
|
|
||
|
|
def _unot(s: int) -> str:
|
||
|
|
return 'U+{:04X}'.format(s)
|
||
|
|
|
||
|
|
|
||
|
|
def valid_label_length(label: Union[bytes, str]) -> bool:
|
||
|
|
if len(label) > 63:
|
||
|
|
return False
|
||
|
|
return True
|
||
|
|
|
||
|
|
|
||
|
|
def valid_string_length(label: Union[bytes, str], trailing_dot: bool) -> bool:
|
||
|
|
if len(label) > (254 if trailing_dot else 253):
|
||
|
|
return False
|
||
|
|
return True
|
||
|
|
|
||
|
|
|
||
|
|
def check_bidi(label: str, check_ltr: bool = False) -> bool:
|
||
|
|
# Bidi rules should only be applied if string contains RTL characters
|
||
|
|
bidi_label = False
|
||
|
|
for (idx, cp) in enumerate(label, 1):
|
||
|
|
direction = unicodedata.bidirectional(cp)
|
||
|
|
if direction == '':
|
||
|
|
# String likely comes from a newer version of Unicode
|
||
|
|
raise IDNABidiError('Unknown directionality in label {} at position {}'.format(repr(label), idx))
|
||
|
|
if direction in ['R', 'AL', 'AN']:
|
||
|
|
bidi_label = True
|
||
|
|
if not bidi_label and not check_ltr:
|
||
|
|
return True
|
||
|
|
|
||
|
|
# Bidi rule 1
|
||
|
|
direction = unicodedata.bidirectional(label[0])
|
||
|
|
if direction in ['R', 'AL']:
|
||
|
|
rtl = True
|
||
|
|
elif direction == 'L':
|
||
|
|
rtl = False
|
||
|
|
else:
|
||
|
|
raise IDNABidiError('First codepoint in label {} must be directionality L, R or AL'.format(repr(label)))
|
||
|
|
|
||
|
|
valid_ending = False
|
||
|
|
number_type = None # type: Optional[str]
|
||
|
|
for (idx, cp) in enumerate(label, 1):
|
||
|
|
direction = unicodedata.bidirectional(cp)
|
||
|
|
|
||
|
|
if rtl:
|
||
|
|
# Bidi rule 2
|
||
|
|
if not direction in ['R', 'AL', 'AN', 'EN', 'ES', 'CS', 'ET', 'ON', 'BN', 'NSM']:
|
||
|
|
raise IDNABidiError('Invalid direction for codepoint at position {} in a right-to-left label'.format(idx))
|
||
|
|
# Bidi rule 3
|
||
|
|
if direction in ['R', 'AL', 'EN', 'AN']:
|
||
|
|
valid_ending = True
|
||
|
|
elif direction != 'NSM':
|
||
|
|
valid_ending = False
|
||
|
|
# Bidi rule 4
|
||
|
|
if direction in ['AN', 'EN']:
|
||
|
|
if not number_type:
|
||
|
|
number_type = direction
|
||
|
|
else:
|
||
|
|
if number_type != direction:
|
||
|
|
raise IDNABidiError('Can not mix numeral types in a right-to-left label')
|
||
|
|
else:
|
||
|
|
# Bidi rule 5
|
||
|
|
if not direction in ['L', 'EN', 'ES', 'CS', 'ET', 'ON', 'BN', 'NSM']:
|
||
|
|
raise IDNABidiError('Invalid direction for codepoint at position {} in a left-to-right label'.format(idx))
|
||
|
|
# Bidi rule 6
|
||
|
|
if direction in ['L', 'EN']:
|
||
|
|
valid_ending = True
|
||
|
|
elif direction != 'NSM':
|
||
|
|
valid_ending = False
|
||
|
|
|
||
|
|
if not valid_ending:
|
||
|
|
raise IDNABidiError('Label ends with illegal codepoint directionality')
|
||
|
|
|
||
|
|
return True
|
||
|
|
|
||
|
|
|
||
|
|
def check_initial_combiner(label: str) -> bool:
|
||
|
|
if unicodedata.category(label[0])[0] == 'M':
|
||
|
|
raise IDNAError('Label begins with an illegal combining character')
|
||
|
|
return True
|
||
|
|
|
||
|
|
|
||
|
|
def check_hyphen_ok(label: str) -> bool:
|
||
|
|
if label[2:4] == '--':
|
||
|
|
raise IDNAError('Label has disallowed hyphens in 3rd and 4th position')
|
||
|
|
if label[0] == '-' or label[-1] == '-':
|
||
|
|
raise IDNAError('Label must not start or end with a hyphen')
|
||
|
|
return True
|
||
|
|
|
||
|
|
|
||
|
|
def check_nfc(label: str) -> None:
|
||
|
|
if unicodedata.normalize('NFC', label) != label:
|
||
|
|
raise IDNAError('Label must be in Normalization Form C')
|
||
|
|
|
||
|
|
|
||
|
|
def valid_contextj(label: str, pos: int) -> bool:
|
||
|
|
cp_value = ord(label[pos])
|
||
|
|
|
||
|
|
if cp_value == 0x200c:
|
||
|
|
|
||
|
|
if pos > 0:
|
||
|
|
if _combining_class(ord(label[pos - 1])) == _virama_combining_class:
|
||
|
|
return True
|
||
|
|
|
||
|
|
ok = False
|
||
|
|
for i in range(pos-1, -1, -1):
|
||
|
|
joining_type = idnadata.joining_types.get(ord(label[i]))
|
||
|
|
if joining_type == ord('T'):
|
||
|
|
continue
|
||
|
|
elif joining_type in [ord('L'), ord('D')]:
|
||
|
|
ok = True
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
break
|
||
|
|
|
||
|
|
if not ok:
|
||
|
|
return False
|
||
|
|
|
||
|
|
ok = False
|
||
|
|
for i in range(pos+1, len(label)):
|
||
|
|
joining_type = idnadata.joining_types.get(ord(label[i]))
|
||
|
|
if joining_type == ord('T'):
|
||
|
|
continue
|
||
|
|
elif joining_type in [ord('R'), ord('D')]:
|
||
|
|
ok = True
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
break
|
||
|
|
return ok
|
||
|
|
|
||
|
|
if cp_value == 0x200d:
|
||
|
|
|
||
|
|
if pos > 0:
|
||
|
|
if _combining_class(ord(label[pos - 1])) == _virama_combining_class:
|
||
|
|
return True
|
||
|
|
return False
|
||
|
|
|
||
|
|
else:
|
||
|
|
|
||
|
|
return False
|
||
|
|
|
||
|
|
|
||
|
|
def valid_contexto(label: str, pos: int, exception: bool = False) -> bool:
|
||
|
|
cp_value = ord(label[pos])
|
||
|
|
|
||
|
|
if cp_value == 0x00b7:
|
||
|
|
if 0 < pos < len(label)-1:
|
||
|
|
if ord(label[pos - 1]) == 0x006c and ord(label[pos + 1]) == 0x006c:
|
||
|
|
return True
|
||
|
|
return False
|
||
|
|
|
||
|
|
elif cp_value == 0x0375:
|
||
|
|
if pos < len(label)-1 and len(label) > 1:
|
||
|
|
return _is_script(label[pos + 1], 'Greek')
|
||
|
|
return False
|
||
|
|
|
||
|
|
elif cp_value == 0x05f3 or cp_value == 0x05f4:
|
||
|
|
if pos > 0:
|
||
|
|
return _is_script(label[pos - 1], 'Hebrew')
|
||
|
|
return False
|
||
|
|
|
||
|
|
elif cp_value == 0x30fb:
|
||
|
|
for cp in label:
|
||
|
|
if cp == '\u30fb':
|
||
|
|
continue
|
||
|
|
if _is_script(cp, 'Hiragana') or _is_script(cp, 'Katakana') or _is_script(cp, 'Han'):
|
||
|
|
return True
|
||
|
|
return False
|
||
|
|
|
||
|
|
elif 0x660 <= cp_value <= 0x669:
|
||
|
|
for cp in label:
|
||
|
|
if 0x6f0 <= ord(cp) <= 0x06f9:
|
||
|
|
return False
|
||
|
|
return True
|
||
|
|
|
||
|
|
elif 0x6f0 <= cp_value <= 0x6f9:
|
||
|
|
for cp in label:
|
||
|
|
if 0x660 <= ord(cp) <= 0x0669:
|
||
|
|
return False
|
||
|
|
return True
|
||
|
|
|
||
|
|
return False
|
||
|
|
|
||
|
|
|
||
|
|
def check_label(label: Union[str, bytes, bytearray]) -> None:
|
||
|
|
if isinstance(label, (bytes, bytearray)):
|
||
|
|
label = label.decode('utf-8')
|
||
|
|
if len(label) == 0:
|
||
|
|
raise IDNAError('Empty Label')
|
||
|
|
|
||
|
|
check_nfc(label)
|
||
|
|
check_hyphen_ok(label)
|
||
|
|
check_initial_combiner(label)
|
||
|
|
|
||
|
|
for (pos, cp) in enumerate(label):
|
||
|
|
cp_value = ord(cp)
|
||
|
|
if intranges_contain(cp_value, idnadata.codepoint_classes['PVALID']):
|
||
|
|
continue
|
||
|
|
elif intranges_contain(cp_value, idnadata.codepoint_classes['CONTEXTJ']):
|
||
|
|
if not valid_contextj(label, pos):
|
||
|
|
raise InvalidCodepointContext('Joiner {} not allowed at position {} in {}'.format(
|
||
|
|
_unot(cp_value), pos+1, repr(label)))
|
||
|
|
elif intranges_contain(cp_value, idnadata.codepoint_classes['CONTEXTO']):
|
||
|
|
if not valid_contexto(label, pos):
|
||
|
|
raise InvalidCodepointContext('Codepoint {} not allowed at position {} in {}'.format(_unot(cp_value), pos+1, repr(label)))
|
||
|
|
else:
|
||
|
|
raise InvalidCodepoint('Codepoint {} at position {} of {} not allowed'.format(_unot(cp_value), pos+1, repr(label)))
|
||
|
|
|
||
|
|
check_bidi(label)
|
||
|
|
|
||
|
|
|
||
|
|
def alabel(label: str) -> bytes:
|
||
|
|
try:
|
||
|
|
label_bytes = label.encode('ascii')
|
||
|
|
ulabel(label_bytes)
|
||
|
|
if not valid_label_length(label_bytes):
|
||
|
|
raise IDNAError('Label too long')
|
||
|
|
return label_bytes
|
||
|
|
except UnicodeEncodeError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
check_label(label)
|
||
|
|
label_bytes = _alabel_prefix + _punycode(label)
|
||
|
|
|
||
|
|
if not valid_label_length(label_bytes):
|
||
|
|
raise IDNAError('Label too long')
|
||
|
|
|
||
|
|
return label_bytes
|
||
|
|
|
||
|
|
|
||
|
|
def ulabel(label: Union[str, bytes, bytearray]) -> str:
|
||
|
|
if not isinstance(label, (bytes, bytearray)):
|
||
|
|
try:
|
||
|
|
label_bytes = label.encode('ascii')
|
||
|
|
except UnicodeEncodeError:
|
||
|
|
check_label(label)
|
||
|
|
return label
|
||
|
|
else:
|
||
|
|
label_bytes = label
|
||
|
|
|
||
|
|
label_bytes = label_bytes.lower()
|
||
|
|
if label_bytes.startswith(_alabel_prefix):
|
||
|
|
label_bytes = label_bytes[len(_alabel_prefix):]
|
||
|
|
if not label_bytes:
|
||
|
|
raise IDNAError('Malformed A-label, no Punycode eligible content found')
|
||
|
|
if label_bytes.decode('ascii')[-1] == '-':
|
||
|
|
raise IDNAError('A-label must not end with a hyphen')
|
||
|
|
else:
|
||
|
|
check_label(label_bytes)
|
||
|
|
return label_bytes.decode('ascii')
|
||
|
|
|
||
|
|
try:
|
||
|
|
label = label_bytes.decode('punycode')
|
||
|
|
except UnicodeError:
|
||
|
|
raise IDNAError('Invalid A-label')
|
||
|
|
check_label(label)
|
||
|
|
return label
|
||
|
|
|
||
|
|
|
||
|
|
def uts46_remap(domain: str, std3_rules: bool = True, transitional: bool = False) -> str:
|
||
|
|
"""Re-map the characters in the string according to UTS46 processing."""
|
||
|
|
from .uts46data import uts46data
|
||
|
|
output = ''
|
||
|
|
|
||
|
|
for pos, char in enumerate(domain):
|
||
|
|
code_point = ord(char)
|
||
|
|
try:
|
||
|
|
uts46row = uts46data[code_point if code_point < 256 else
|
||
|
|
bisect.bisect_left(uts46data, (code_point, 'Z')) - 1]
|
||
|
|
status = uts46row[1]
|
||
|
|
replacement = None # type: Optional[str]
|
||
|
|
if len(uts46row) == 3:
|
||
|
|
replacement = uts46row[2]
|
||
|
|
if (status == 'V' or
|
||
|
|
(status == 'D' and not transitional) or
|
||
|
|
(status == '3' and not std3_rules and replacement is None)):
|
||
|
|
output += char
|
||
|
|
elif replacement is not None and (status == 'M' or
|
||
|
|
(status == '3' and not std3_rules) or
|
||
|
|
(status == 'D' and transitional)):
|
||
|
|
output += replacement
|
||
|
|
elif status != 'I':
|
||
|
|
raise IndexError()
|
||
|
|
except IndexError:
|
||
|
|
raise InvalidCodepoint(
|
||
|
|
'Codepoint {} not allowed at position {} in {}'.format(
|
||
|
|
_unot(code_point), pos + 1, repr(domain)))
|
||
|
|
|
||
|
|
return unicodedata.normalize('NFC', output)
|
||
|
|
|
||
|
|
|
||
|
|
def encode(s: Union[str, bytes, bytearray], strict: bool = False, uts46: bool = False, std3_rules: bool = False, transitional: bool = False) -> bytes:
|
||
|
|
if not isinstance(s, str):
|
||
|
|
try:
|
||
|
|
s = str(s, 'ascii')
|
||
|
|
except UnicodeDecodeError:
|
||
|
|
raise IDNAError('should pass a unicode string to the function rather than a byte string.')
|
||
|
|
if uts46:
|
||
|
|
s = uts46_remap(s, std3_rules, transitional)
|
||
|
|
trailing_dot = False
|
||
|
|
result = []
|
||
|
|
if strict:
|
||
|
|
labels = s.split('.')
|
||
|
|
else:
|
||
|
|
labels = _unicode_dots_re.split(s)
|
||
|
|
if not labels or labels == ['']:
|
||
|
|
raise IDNAError('Empty domain')
|
||
|
|
if labels[-1] == '':
|
||
|
|
del labels[-1]
|
||
|
|
trailing_dot = True
|
||
|
|
for label in labels:
|
||
|
|
s = alabel(label)
|
||
|
|
if s:
|
||
|
|
result.append(s)
|
||
|
|
else:
|
||
|
|
raise IDNAError('Empty label')
|
||
|
|
if trailing_dot:
|
||
|
|
result.append(b'')
|
||
|
|
s = b'.'.join(result)
|
||
|
|
if not valid_string_length(s, trailing_dot):
|
||
|
|
raise IDNAError('Domain too long')
|
||
|
|
return s
|
||
|
|
|
||
|
|
|
||
|
|
def decode(s: Union[str, bytes, bytearray], strict: bool = False, uts46: bool = False, std3_rules: bool = False) -> str:
|
||
|
|
try:
|
||
|
|
if not isinstance(s, str):
|
||
|
|
s = str(s, 'ascii')
|
||
|
|
except UnicodeDecodeError:
|
||
|
|
raise IDNAError('Invalid ASCII in A-label')
|
||
|
|
if uts46:
|
||
|
|
s = uts46_remap(s, std3_rules, False)
|
||
|
|
trailing_dot = False
|
||
|
|
result = []
|
||
|
|
if not strict:
|
||
|
|
labels = _unicode_dots_re.split(s)
|
||
|
|
else:
|
||
|
|
labels = s.split('.')
|
||
|
|
if not labels or labels == ['']:
|
||
|
|
raise IDNAError('Empty domain')
|
||
|
|
if not labels[-1]:
|
||
|
|
del labels[-1]
|
||
|
|
trailing_dot = True
|
||
|
|
for label in labels:
|
||
|
|
s = ulabel(label)
|
||
|
|
if s:
|
||
|
|
result.append(s)
|
||
|
|
else:
|
||
|
|
raise IDNAError('Empty label')
|
||
|
|
if trailing_dot:
|
||
|
|
result.append('')
|
||
|
|
return '.'.join(result)
|