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Edit File : core.py \| Size : 11.46 KB
from . import idnadata import bisect import unicodedata import re import sys from .intranges import intranges_contain _virama_combining_class = 9 _alabel_prefix = b'xn--' _unicode_dots_re = re.compile(u'[\u002e\u3002\uff0e\uff61]') if sys.version_info[0] == 3: unicode = str unichr = chr 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): v = unicodedata.combining(unichr(cp)) if v == 0: if not unicodedata.name(unichr(cp)): raise ValueError("Unknown character in unicodedata") return v def _is_script(cp, script): return intranges_contain(ord(cp), idnadata.scripts[script]) def _punycode(s): return s.encode('punycode') def _unot(s): return 'U+{0:04X}'.format(s) def valid_label_length(label): if len(label) > 63: return False return True def valid_string_length(label, trailing_dot): if len(label) > (254 if trailing_dot else 253): return False return True def check_bidi(label, check_ltr=False): # 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 {0} at position {1}'.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 {0} must be directionality L, R or AL'.format(repr(label))) valid_ending = False number_type = False 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 {0} 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 {0} 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): if unicodedata.category(label[0])[0] == 'M': raise IDNAError('Label begins with an illegal combining character') return True def check_hyphen_ok(label): 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): if unicodedata.normalize('NFC', label) != label: raise IDNAError('Label must be in Normalization Form C') def valid_contextj(label, pos): 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 if joining_type in [ord('L'), ord('D')]: ok = True 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 if joining_type in [ord('R'), ord('D')]: ok = True 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, pos, exception=False): 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 == u'\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 def check_label(label): 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']): try: if not valid_contextj(label, pos): raise InvalidCodepointContext('Joiner {0} not allowed at position {1} in {2}'.format( _unot(cp_value), pos+1, repr(label))) except ValueError: raise IDNAError('Unknown codepoint adjacent to joiner {0} at position {1} in {2}'.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 {0} not allowed at position {1} in {2}'.format(_unot(cp_value), pos+1, repr(label))) else: raise InvalidCodepoint('Codepoint {0} at position {1} of {2} not allowed'.format(_unot(cp_value), pos+1, repr(label))) check_bidi(label) def alabel(label): try: label = label.encode('ascii') ulabel(label) if not valid_label_length(label): raise IDNAError('Label too long') return label except UnicodeEncodeError: pass if not label: raise IDNAError('No Input') label = unicode(label) check_label(label) label = _punycode(label) label = _alabel_prefix + label if not valid_label_length(label): raise IDNAError('Label too long') return label def ulabel(label): if not isinstance(label, (bytes, bytearray)): try: label = label.encode('ascii') except UnicodeEncodeError: check_label(label) return label label = label.lower() if label.startswith(_alabel_prefix): label = label[len(_alabel_prefix):] else: check_label(label) return label.decode('ascii') label = label.decode('punycode') check_label(label) return label def uts46_remap(domain, std3_rules=True, transitional=False): """Re-map the characters in the string according to UTS46 processing.""" from .uts46data import uts46data output = u"" try: for pos, char in enumerate(domain): code_point = ord(char) uts46row = uts46data[code_point if code_point < 256 else bisect.bisect_left(uts46data, (code_point, "Z")) - 1] status = uts46row[1] replacement = uts46row[2] if len(uts46row) == 3 else None 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() return unicodedata.normalize("NFC", output) except IndexError: raise InvalidCodepoint( "Codepoint {0} not allowed at position {1} in {2}".format( _unot(code_point), pos + 1, repr(domain))) def encode(s, strict=False, uts46=False, std3_rules=False, transitional=False): 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, strict=False, uts46=False, std3_rules=False): if isinstance(s, (bytes, bytearray)): s = s.decode("ascii") 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(u'.') 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(u'') return u'.'.join(result) Back

Edit File : core.py | Size : 11.46 KB

from . import idnadata
import bisect
import unicodedata
import re
import sys
from .intranges import intranges_contain

_virama_combining_class = 9
_alabel_prefix = b'xn--'
_unicode_dots_re = re.compile(u'[\u002e\u3002\uff0e\uff61]')

if sys.version_info[0] == 3:
    unicode = str
    unichr = chr

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):
    v = unicodedata.combining(unichr(cp))
    if v == 0:
        if not unicodedata.name(unichr(cp)):
            raise ValueError("Unknown character in unicodedata")
    return v

def _is_script(cp, script):
    return intranges_contain(ord(cp), idnadata.scripts[script])

def _punycode(s):
    return s.encode('punycode')

def _unot(s):
    return 'U+{0:04X}'.format(s)

def valid_label_length(label):

if len(label) > 63:
        return False
    return True

def valid_string_length(label, trailing_dot):

if len(label) > (254 if trailing_dot else 253):
        return False
    return True

def check_bidi(label, check_ltr=False):

# 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 {0} at position {1}'.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 {0} must be directionality L, R or AL'.format(repr(label)))

valid_ending = False
    number_type = False
    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 {0} 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 {0} 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):

if unicodedata.category(label[0])[0] == 'M':
        raise IDNAError('Label begins with an illegal combining character')
    return True

def check_hyphen_ok(label):

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):

if unicodedata.normalize('NFC', label) != label:
        raise IDNAError('Label must be in Normalization Form C')

def valid_contextj(label, pos):

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
            if joining_type in [ord('L'), ord('D')]:
                ok = True
                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
            if joining_type in [ord('R'), ord('D')]:
                ok = True
                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, pos, exception=False):

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 == u'\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

def check_label(label):

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']):
            try:
                if not valid_contextj(label, pos):
                    raise InvalidCodepointContext('Joiner {0} not allowed at position {1} in {2}'.format(
                        _unot(cp_value), pos+1, repr(label)))
            except ValueError:
                raise IDNAError('Unknown codepoint adjacent to joiner {0} at position {1} in {2}'.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 {0} not allowed at position {1} in {2}'.format(_unot(cp_value), pos+1, repr(label)))
        else:
            raise InvalidCodepoint('Codepoint {0} at position {1} of {2} not allowed'.format(_unot(cp_value), pos+1, repr(label)))

check_bidi(label)

def alabel(label):

try:
        label = label.encode('ascii')
        ulabel(label)
        if not valid_label_length(label):
            raise IDNAError('Label too long')
        return label
    except UnicodeEncodeError:
        pass

if not label:
        raise IDNAError('No Input')

label = unicode(label)
    check_label(label)
    label = _punycode(label)
    label = _alabel_prefix + label

if not valid_label_length(label):
        raise IDNAError('Label too long')

return label

def ulabel(label):

if not isinstance(label, (bytes, bytearray)):
        try:
            label = label.encode('ascii')
        except UnicodeEncodeError:
            check_label(label)
            return label

label = label.lower()
    if label.startswith(_alabel_prefix):
        label = label[len(_alabel_prefix):]
    else:
        check_label(label)
        return label.decode('ascii')

label = label.decode('punycode')
    check_label(label)
    return label

def uts46_remap(domain, std3_rules=True, transitional=False):
    """Re-map the characters in the string according to UTS46 processing."""
    from .uts46data import uts46data
    output = u""
    try:
        for pos, char in enumerate(domain):
            code_point = ord(char)
            uts46row = uts46data[code_point if code_point < 256 else
                bisect.bisect_left(uts46data, (code_point, "Z")) - 1]
            status = uts46row[1]
            replacement = uts46row[2] if len(uts46row) == 3 else None
            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()
        return unicodedata.normalize("NFC", output)
    except IndexError:
        raise InvalidCodepoint(
            "Codepoint {0} not allowed at position {1} in {2}".format(
            _unot(code_point), pos + 1, repr(domain)))

def encode(s, strict=False, uts46=False, std3_rules=False, transitional=False):

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, strict=False, uts46=False, std3_rules=False):

if isinstance(s, (bytes, bytearray)):
        s = s.decode("ascii")
    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(u'.')
    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(u'')
    return u'.'.join(result)

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