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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙfrom . 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 if not label: raise IDNAError('No Input') label = str(label) check_label(label) label_bytes = _punycode(label) label_bytes = _alabel_prefix + label_bytes 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] # type: ignore 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 isinstance(s, (bytes, bytearray)): s = s.decode('ascii') 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 isinstance(s, (bytes, bytearray)): s = s.decode('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)