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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’IIGÿÙ# 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("[\u002E\u3002\uFF0E\uFF61]") # IDNA section 5 ace_prefix = b"xn--" sace_prefix = "xn--" # 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 = "".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 = [stringprep.in_table_d1(x) for x in 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(sace_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, bytes): 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 str(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 str(label, "ascii").lower() != str(label2, "ascii"): 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 b'', 0 try: result = input.encode('ascii') except UnicodeEncodeError: pass else: # ASCII name: fast path labels = result.split(b'.') for label in labels[:-1]: if not (0 < len(label) < 64): raise UnicodeError("label empty or too long") if len(labels[-1]) >= 64: raise UnicodeError("label too long") return result, len(input) result = bytearray() labels = dots.split(input) if labels and not labels[-1]: trailing_dot = b'.' del labels[-1] else: trailing_dot = b'' for label in labels: if result: # Join with U+002E result.extend(b'.') result.extend(ToASCII(label)) return bytes(result+trailing_dot), len(input) def decode(self, input, errors='strict'): if errors != 'strict': raise UnicodeError("Unsupported error handling "+errors) if not input: return "", 0 # IDNA allows decoding to operate on Unicode strings, too. if not isinstance(input, bytes): # XXX obviously wrong, see #3232 input = bytes(input) if ace_prefix not in input: # Fast path try: return input.decode('ascii'), len(input) except UnicodeDecodeError: pass labels = input.split(b".") if labels and len(labels[-1]) == 0: trailing_dot = '.' del labels[-1] else: trailing_dot = '' result = [] for label in labels: result.append(ToUnicode(label)) return ".".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 (b'', 0) labels = dots.split(input) trailing_dot = b'' if labels: if not labels[-1]: trailing_dot = b'.' del labels[-1] elif not final: # Keep potentially unfinished label until the next call del labels[-1] if labels: trailing_dot = b'.' result = bytearray() size = 0 for label in labels: if size: # Join with U+002E result.extend(b'.') size += 1 result.extend(ToASCII(label)) size += len(label) result += trailing_dot size += len(trailing_dot) return (bytes(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 ("", 0) # IDNA allows decoding to operate on Unicode strings, too. if isinstance(input, str): labels = dots.split(input) else: # Must be ASCII string input = str(input, "ascii") labels = input.split(".") trailing_dot = '' 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(ToUnicode(label)) if size: size += 1 size += len(label) result = ".".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, )