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05/09/2024 07:14:10 AM
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__init__.py
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aliases.py
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ascii.py
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base64_codec.py
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big5.py
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big5hkscs.py
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bz2_codec.py
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charmap.py
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cp037.py
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cp1006.py
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cp1026.py
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cp1140.py
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cp1250.py
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cp1251.py
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cp1252.py
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cp1253.py
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cp1254.py
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cp1255.py
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cp1256.py
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cp1257.py
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cp1258.py
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cp424.py
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cp437.py
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cp500.py
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cp720.py
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cp737.py
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cp775.py
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cp850.py
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cp852.py
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cp855.py
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cp856.py
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cp857.py
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cp860.py
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cp862.py
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cp864.py
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cp865.py
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cp869.py
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cp874.py
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cp875.py
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cp932.py
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cp949.py
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cp950.py
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euc_jis_2004.py
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euc_jisx0213.py
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euc_jp.py
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euc_kr.py
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gb18030.py
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gb2312.py
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gbk.py
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hex_codec.py
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hp_roman8.py
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hz.py
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idna.py
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iso2022_jp.py
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iso2022_jp_1.py
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iso2022_jp_2.py
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iso2022_jp_2004.py
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iso2022_jp_3.py
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iso2022_jp_ext.py
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iso2022_kr.py
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iso8859_1.py
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iso8859_10.py
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iso8859_11.py
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iso8859_13.py
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iso8859_14.py
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iso8859_15.py
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iso8859_16.py
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iso8859_2.py
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iso8859_3.py
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iso8859_4.py
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iso8859_5.py
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iso8859_6.py
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iso8859_7.py
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iso8859_8.py
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iso8859_9.py
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johab.py
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koi8_r.py
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koi8_u.py
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latin_1.py
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mac_arabic.py
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mac_centeuro.py
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mac_croatian.py
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mac_cyrillic.py
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mac_farsi.py
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mac_greek.py
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mac_iceland.py
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mac_latin2.py
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mac_roman.py
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mac_romanian.py
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mac_turkish.py
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mbcs.py
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palmos.py
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ptcp154.py
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punycode.py
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quopri_codec.py
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raw_unicode_escape.py
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rot_13.py
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shift_jis.py
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shift_jis_2004.py
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shift_jisx0213.py
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string_escape.py
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tis_620.py
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undefined.py
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unicode_escape.py
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unicode_internal.py
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utf_16.py
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utf_16_be.py
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utf_16_le.py
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utf_32.py
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utf_32_be.py
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utf_32_le.py
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utf_7.py
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utf_8.py
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utf_8_sig.py
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uu_codec.py
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zlib_codec.py
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Editing: idna.py
Close
# This module implements the RFCs 3490 (IDNA) and 3491 (Nameprep) import stringprep, re, codecs from unicodedata import ucd_3_2_0 as unicodedata # IDNA section 3.1 dots = re.compile(u"[\u002E\u3002\uFF0E\uFF61]") # IDNA section 5 ace_prefix = "xn--" uace_prefix = unicode(ace_prefix, "ascii") # This assumes query strings, so AllowUnassigned is true def nameprep(label): # Map newlabel = [] for c in label: if stringprep.in_table_b1(c): # Map to nothing continue newlabel.append(stringprep.map_table_b2(c)) label = u"".join(newlabel) # Normalize label = unicodedata.normalize("NFKC", label) # Prohibit for c in label: if stringprep.in_table_c12(c) or \ stringprep.in_table_c22(c) or \ stringprep.in_table_c3(c) or \ stringprep.in_table_c4(c) or \ stringprep.in_table_c5(c) or \ stringprep.in_table_c6(c) or \ stringprep.in_table_c7(c) or \ stringprep.in_table_c8(c) or \ stringprep.in_table_c9(c): raise UnicodeError("Invalid character %r" % c) # Check bidi RandAL = map(stringprep.in_table_d1, label) if any(RandAL): # There is a RandAL char in the string. Must perform further # tests: # 1) The characters in section 5.8 MUST be prohibited. # This is table C.8, which was already checked # 2) If a string contains any RandALCat character, the string # MUST NOT contain any LCat character. if any(stringprep.in_table_d2(x) for x in label): raise UnicodeError("Violation of BIDI requirement 2") # 3) If a string contains any RandALCat character, a # RandALCat character MUST be the first character of the # string, and a RandALCat character MUST be the last # character of the string. if not RandAL[0] or not RandAL[-1]: raise UnicodeError("Violation of BIDI requirement 3") return label def ToASCII(label): try: # Step 1: try ASCII label = label.encode("ascii") except UnicodeError: pass else: # Skip to step 3: UseSTD3ASCIIRules is false, so # Skip to step 8. if 0 < len(label) < 64: return label raise UnicodeError("label empty or too long") # Step 2: nameprep label = nameprep(label) # Step 3: UseSTD3ASCIIRules is false # Step 4: try ASCII try: label = label.encode("ascii") except UnicodeError: pass else: # Skip to step 8. if 0 < len(label) < 64: return label raise UnicodeError("label empty or too long") # Step 5: Check ACE prefix if label.startswith(uace_prefix): raise UnicodeError("Label starts with ACE prefix") # Step 6: Encode with PUNYCODE label = label.encode("punycode") # Step 7: Prepend ACE prefix label = ace_prefix + label # Step 8: Check size if 0 < len(label) < 64: return label raise UnicodeError("label empty or too long") def ToUnicode(label): # Step 1: Check for ASCII if isinstance(label, str): pure_ascii = True else: try: label = label.encode("ascii") pure_ascii = True except UnicodeError: pure_ascii = False if not pure_ascii: # Step 2: Perform nameprep label = nameprep(label) # It doesn't say this, but apparently, it should be ASCII now try: label = label.encode("ascii") except UnicodeError: raise UnicodeError("Invalid character in IDN label") # Step 3: Check for ACE prefix if not label.startswith(ace_prefix): return unicode(label, "ascii") # Step 4: Remove ACE prefix label1 = label[len(ace_prefix):] # Step 5: Decode using PUNYCODE result = label1.decode("punycode") # Step 6: Apply ToASCII label2 = ToASCII(result) # Step 7: Compare the result of step 6 with the one of step 3 # label2 will already be in lower case. if label.lower() != label2: raise UnicodeError("IDNA does not round-trip", label, label2) # Step 8: return the result of step 5 return result ### Codec APIs class Codec(codecs.Codec): def encode(self,input,errors='strict'): if errors != 'strict': # IDNA is quite clear that implementations must be strict raise UnicodeError("unsupported error handling "+errors) if not input: return "", 0 result = [] labels = dots.split(input) if labels and len(labels[-1])==0: trailing_dot = '.' del labels[-1] else: trailing_dot = '' for label in labels: result.append(ToASCII(label)) # Join with U+002E return ".".join(result)+trailing_dot, len(input) def decode(self,input,errors='strict'): if errors != 'strict': raise UnicodeError("Unsupported error handling "+errors) if not input: return u"", 0 # IDNA allows decoding to operate on Unicode strings, too. if isinstance(input, unicode): labels = dots.split(input) else: # Must be ASCII string input = str(input) unicode(input, "ascii") labels = input.split(".") if labels and len(labels[-1]) == 0: trailing_dot = u'.' del labels[-1] else: trailing_dot = u'' result = [] for label in labels: result.append(ToUnicode(label)) return u".".join(result)+trailing_dot, len(input) class IncrementalEncoder(codecs.BufferedIncrementalEncoder): def _buffer_encode(self, input, errors, final): if errors != 'strict': # IDNA is quite clear that implementations must be strict raise UnicodeError("unsupported error handling "+errors) if not input: return ("", 0) labels = dots.split(input) trailing_dot = u'' if labels: if not labels[-1]: trailing_dot = '.' del labels[-1] elif not final: # Keep potentially unfinished label until the next call del labels[-1] if labels: trailing_dot = '.' result = [] size = 0 for label in labels: result.append(ToASCII(label)) if size: size += 1 size += len(label) # Join with U+002E result = ".".join(result) + trailing_dot size += len(trailing_dot) return (result, size) class IncrementalDecoder(codecs.BufferedIncrementalDecoder): def _buffer_decode(self, input, errors, final): if errors != 'strict': raise UnicodeError("Unsupported error handling "+errors) if not input: return (u"", 0) # IDNA allows decoding to operate on Unicode strings, too. if isinstance(input, unicode): labels = dots.split(input) else: # Must be ASCII string input = str(input) unicode(input, "ascii") labels = input.split(".") trailing_dot = u'' if labels: if not labels[-1]: trailing_dot = u'.' del labels[-1] elif not final: # Keep potentially unfinished label until the next call del labels[-1] if labels: trailing_dot = u'.' result = [] size = 0 for label in labels: result.append(ToUnicode(label)) if size: size += 1 size += len(label) result = u".".join(result) + trailing_dot size += len(trailing_dot) return (result, size) class StreamWriter(Codec,codecs.StreamWriter): pass class StreamReader(Codec,codecs.StreamReader): pass ### encodings module API def getregentry(): return codecs.CodecInfo( name='idna', encode=Codec().encode, decode=Codec().decode, incrementalencoder=IncrementalEncoder, incrementaldecoder=IncrementalDecoder, streamwriter=StreamWriter, streamreader=StreamReader, )