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import codecs
import re
from java.net import IDN
try:
# import from jarjar-ed version if available
from org.python.icu.text import StringPrep, StringPrepParseException
except ImportError:
# dev version of Jython, so use extlibs
from com.ibm.icu.text import StringPrep, StringPrepParseException
# IDNA section 3.1
dots = re.compile(u"[\u002E\u3002\uFF0E\uFF61]")
def nameprep(label):
try:
return StringPrep.getInstance(StringPrep.RFC3491_NAMEPREP).prepare(
label, StringPrep.ALLOW_UNASSIGNED)
except StringPrepParseException, e:
raise UnicodeError("Invalid character")
def ToASCII(label):
return IDN.toASCII(label)
def ToUnicode(label):
return IDN.toUnicode(label)
# BELOW is the implementation shared with CPython. TODO we should merge.
### 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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