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Diffstat (limited to 'AppPkg/Applications/Python/Python-2.7.10/Lib/encodings/idna.py')
| -rw-r--r-- | AppPkg/Applications/Python/Python-2.7.10/Lib/encodings/idna.py | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/AppPkg/Applications/Python/Python-2.7.10/Lib/encodings/idna.py b/AppPkg/Applications/Python/Python-2.7.10/Lib/encodings/idna.py new file mode 100644 index 0000000000..ecbf2bed3f --- /dev/null +++ b/AppPkg/Applications/Python/Python-2.7.10/Lib/encodings/idna.py @@ -0,0 +1,288 @@ +# 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)
+ for c in RandAL:
+ if c:
+ # 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 filter(stringprep.in_table_d2, 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,
+ )
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