How Python solves secure_ Filename does not support Chinese

catalogue

• 1、 Recently used secure_ Problems found by filename
• 2、 The reason was found later
• 3、 Solution
• 4、 Effect display

secure_ Filename (filename) function source code:
def secure_filename(filename: str) -> str:
    r"""Pass it a filename and it will return a secure version of it.  This
    filename can then safely be stored on a regular file system and passed
    to :func:`os.path.join`.  The filename returned is an ASCII only string
    for maximum portability.

    On windows systems the function also makes sure that the file is not
    named after one of the special device files.

    >>> secure_filename("My cool movie.mov")
    'My_cool_movie.mov'
    >>> secure_filename("../../../etc/passwd")
    'etc_passwd'
    >>> secure_filename('i contain cool \xfcml\xe4uts.txt')
    'i_contain_cool_umlauts.txt'

    The function might return an empty filename.  It's your responsibility
    to ensure that the filename is unique and that you abort or
    generate a random filename if the function returned an empty one.

    .. versionadded:: 0.5

    :param filename: the filename to secure
    """
    filename = unicodedata.normalize("NFKD", filename)
    filename = filename.encode("ascii", "ignore").decode("ascii")

    for sep in os.path.sep, os.path.altsep:
        if sep:
            filename = filename.replace(sep, " ")
    filename = str(_filename_ascii_strip_re.sub("", "_".join(filename.split()))).strip(
        "._"
    )

    # on nt a couple of special files are present in each folder.  We
    # have to ensure that the target file is not such a filename.  In
    # this case we prepend an underline
    if (
        os.name == "nt"
        and filename
        and filename.split(".")[0].upper() in _windows_device_files
    ):
        filename = f"_{filename}"

    return filename

def secure_filename(filename: str) -> str:
    r"""Pass it a filename and it will return a secure version of it.  This
    filename can then safely be stored on a regular file system and passed
    to :func:`os.path.join`.  The filename returned is an ASCII only string
    for maximum portability.

    On windows systems the function also makes sure that the file is not
    named after one of the special device files.

    >>> secure_filename("My cool movie.mov")
    'My_cool_movie.mov'
    >>> secure_filename("../../../etc/passwd")
    'etc_passwd'
    >>> secure_filename('i contain cool \xfcml\xe4uts.txt')
    'i_contain_cool_umlauts.txt'

    The function might return an empty filename.  It's your responsibility
    to ensure that the filename is unique and that you abort or
    generate a random filename if the function returned an empty one.

    .. versionadded:: 0.5

    :param filename: the filename to secure
    """
    filename = unicodedata.normalize("NFKD", filename)
    Filename = filename. Encode ("utf8", "ignore"). Decode ("utf8") # encoding format changed

    for sep in os.path.sep, os.path.altsep:
        if sep:
            filename = filename.replace(sep, " ")
    _filename_ascii_add_strip_re = re.compile(r'[^A-Za-z0-9_\u4E00-\u9FBF\u3040-\u30FF\u31F0-\u31FF.-]')
    Filename = str (_filename_ascii_add_strip_re. Sub ('', ''. Join (filename. Split())))). Strip ('.') # add new rule

    # on nt a couple of special files are present in each folder.  We
    # have to ensure that the target file is not such a filename.  In
    # this case we prepend an underline
    if (
        os.name == "nt"
        and filename
        and filename.split(".")[0].upper() in _windows_device_files
    ):
        filename = f"_{filename}"

    return filename