123 lines
3.3 KiB
Python
123 lines
3.3 KiB
Python
import codecs
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import re
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from typing import Any, Optional, Tuple
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from .core import IDNAError, alabel, decode, encode, ulabel
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_unicode_dots_re = re.compile("[\u002e\u3002\uff0e\uff61]")
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class Codec(codecs.Codec):
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def encode(self, data: str, errors: str = "strict") -> Tuple[bytes, int]:
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if errors != "strict":
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raise IDNAError('Unsupported error handling "{}"'.format(errors))
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if not data:
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return b"", 0
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return encode(data), len(data)
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def decode(self, data: bytes, errors: str = "strict") -> Tuple[str, int]:
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if errors != "strict":
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raise IDNAError('Unsupported error handling "{}"'.format(errors))
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if not data:
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return "", 0
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return decode(data), len(data)
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class IncrementalEncoder(codecs.BufferedIncrementalEncoder):
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def _buffer_encode(self, data: str, errors: str, final: bool) -> Tuple[bytes, int]:
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if errors != "strict":
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raise IDNAError('Unsupported error handling "{}"'.format(errors))
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if not data:
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return b"", 0
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labels = _unicode_dots_re.split(data)
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trailing_dot = b""
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if labels:
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if not labels[-1]:
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trailing_dot = b"."
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del labels[-1]
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elif not final:
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# Keep potentially unfinished label until the next call
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del labels[-1]
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if labels:
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trailing_dot = b"."
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result = []
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size = 0
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for label in labels:
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result.append(alabel(label))
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if size:
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size += 1
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size += len(label)
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# Join with U+002E
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result_bytes = b".".join(result) + trailing_dot
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size += len(trailing_dot)
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return result_bytes, size
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class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
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def _buffer_decode(self, data: Any, errors: str, final: bool) -> Tuple[str, int]:
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if errors != "strict":
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raise IDNAError('Unsupported error handling "{}"'.format(errors))
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if not data:
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return ("", 0)
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if not isinstance(data, str):
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data = str(data, "ascii")
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labels = _unicode_dots_re.split(data)
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trailing_dot = ""
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if labels:
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if not labels[-1]:
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trailing_dot = "."
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del labels[-1]
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elif not final:
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# Keep potentially unfinished label until the next call
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del labels[-1]
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if labels:
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trailing_dot = "."
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result = []
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size = 0
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for label in labels:
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result.append(ulabel(label))
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if size:
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size += 1
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size += len(label)
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result_str = ".".join(result) + trailing_dot
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size += len(trailing_dot)
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return (result_str, size)
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class StreamWriter(Codec, codecs.StreamWriter):
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pass
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class StreamReader(Codec, codecs.StreamReader):
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pass
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def search_function(name: str) -> Optional[codecs.CodecInfo]:
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if name != "idna2008":
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return None
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return codecs.CodecInfo(
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name=name,
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encode=Codec().encode,
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decode=Codec().decode,
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incrementalencoder=IncrementalEncoder,
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incrementaldecoder=IncrementalDecoder,
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streamwriter=StreamWriter,
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streamreader=StreamReader,
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)
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codecs.register(search_function)
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