"""
.. codeauthor:: Tsuyoshi Hombashi <tsuyoshi.hombashi@gmail.com>
"""
import ntpath
import os.path
import posixpath
import re
import warnings
from pathlib import Path, PurePath
from typing import List, Optional, Pattern, Sequence, Tuple
from ._base import AbstractSanitizer, AbstractValidator, BaseFile, BaseValidator
from ._common import findall_to_str, to_str, validate_pathtype
from ._const import _NTFS_RESERVED_FILE_NAMES, DEFAULT_MIN_LEN, INVALID_CHAR_ERR_MSG_TMPL, Platform
from ._filename import FileNameSanitizer, FileNameValidator
from ._types import PathType, PlatformType
from .error import ErrorAttrKey, ErrorReason, InvalidCharError, ReservedNameError, ValidationError
from .handler import ReservedNameHandler, ValidationErrorHandler
_RE_INVALID_PATH = re.compile(f"[{re.escape(BaseFile._INVALID_PATH_CHARS):s}]", re.UNICODE)
_RE_INVALID_WIN_PATH = re.compile(f"[{re.escape(BaseFile._INVALID_WIN_PATH_CHARS):s}]", re.UNICODE)
class FilePathSanitizer(AbstractSanitizer):
def __init__(
self,
max_len: int = -1,
fs_encoding: Optional[str] = None,
platform: Optional[PlatformType] = None,
null_value_handler: Optional[ValidationErrorHandler] = None,
reserved_name_handler: Optional[ValidationErrorHandler] = None,
additional_reserved_names: Optional[Sequence[str]] = None,
normalize: bool = True,
validate_after_sanitize: bool = False,
validator: Optional[AbstractValidator] = None,
) -> None:
if validator:
fpath_validator = validator
else:
fpath_validator = FilePathValidator(
min_len=DEFAULT_MIN_LEN,
max_len=max_len,
fs_encoding=fs_encoding,
check_reserved=True,
additional_reserved_names=additional_reserved_names,
platform=platform,
)
super().__init__(
max_len=max_len,
fs_encoding=fs_encoding,
validator=fpath_validator,
null_value_handler=null_value_handler,
reserved_name_handler=reserved_name_handler,
additional_reserved_names=additional_reserved_names,
platform=platform,
validate_after_sanitize=validate_after_sanitize,
)
self._sanitize_regexp = self._get_sanitize_regexp()
self.__fname_sanitizer = FileNameSanitizer(
max_len=self.max_len,
fs_encoding=fs_encoding,
null_value_handler=null_value_handler,
reserved_name_handler=reserved_name_handler,
additional_reserved_names=additional_reserved_names,
platform=self.platform,
validate_after_sanitize=validate_after_sanitize,
)
self.__normalize = normalize
if self._is_windows(include_universal=True):
self.__split_drive = ntpath.splitdrive
else:
self.__split_drive = posixpath.splitdrive
def sanitize(self, value: PathType, replacement_text: str = "") -> PathType:
try:
validate_pathtype(value, allow_whitespaces=not self._is_windows(include_universal=True))
except ValidationError as e:
if e.reason == ErrorReason.NULL_NAME:
if isinstance(value, PurePath):
raise
return self._null_value_handler(e)
raise
unicode_filepath = to_str(value)
drive, unicode_filepath = self.__split_drive(unicode_filepath)
unicode_filepath = self._sanitize_regexp.sub(replacement_text, unicode_filepath)
if self.__normalize and unicode_filepath:
unicode_filepath = os.path.normpath(unicode_filepath)
sanitized_path = unicode_filepath
sanitized_entries: List[str] = []
if drive:
sanitized_entries.append(drive)
for entry in sanitized_path.replace("\\", "/").split("/"):
if entry in _NTFS_RESERVED_FILE_NAMES:
sanitized_entries.append(f"{entry}_")
continue
sanitized_entry = str(
self.__fname_sanitizer.sanitize(entry, replacement_text=replacement_text)
)
if not sanitized_entry:
if not sanitized_entries:
sanitized_entries.append("")
continue
sanitized_entries.append(sanitized_entry)
sanitized_path = self.__get_path_separator().join(sanitized_entries)
try:
self._validator.validate(sanitized_path)
except ValidationError as e:
if e.reason == ErrorReason.NULL_NAME:
sanitized_path = self._null_value_handler(e)
if self._validate_after_sanitize:
self._validator.validate(sanitized_path)
if isinstance(value, PurePath):
return Path(sanitized_path)
return sanitized_path
def _get_sanitize_regexp(self) -> Pattern[str]:
if self._is_windows(include_universal=True):
return _RE_INVALID_WIN_PATH
return _RE_INVALID_PATH
def __get_path_separator(self) -> str:
if self._is_windows():
return "\\"
return "/"
class FilePathValidator(BaseValidator):
_RE_NTFS_RESERVED = re.compile(
"|".join(f"^/{re.escape(pattern)}$" for pattern in _NTFS_RESERVED_FILE_NAMES),
re.IGNORECASE,
)
_MACOS_RESERVED_FILE_PATHS = ("/", ":")
@property
def reserved_keywords(self) -> Tuple[str, ...]:
common_keywords = super().reserved_keywords
if any([self._is_universal(), self._is_posix(), self._is_macos()]):
return common_keywords + self._MACOS_RESERVED_FILE_PATHS
if self._is_linux():
return common_keywords + ("/",)
return common_keywords
def __init__(
self,
min_len: int = DEFAULT_MIN_LEN,
max_len: int = -1,
fs_encoding: Optional[str] = None,
platform: Optional[PlatformType] = None,
check_reserved: bool = True,
additional_reserved_names: Optional[Sequence[str]] = None,
) -> None:
super().__init__(
min_len=min_len,
max_len=max_len,
fs_encoding=fs_encoding,
check_reserved=check_reserved,
additional_reserved_names=additional_reserved_names,
platform=platform,
)
self.__fname_validator = FileNameValidator(
min_len=min_len,
max_len=max_len,
check_reserved=check_reserved,
additional_reserved_names=additional_reserved_names,
platform=platform,
)
if self._is_windows(include_universal=True):
self.__split_drive = ntpath.splitdrive
else:
self.__split_drive = posixpath.splitdrive
def validate(self, value: PathType) -> None:
validate_pathtype(value, allow_whitespaces=not self._is_windows(include_universal=True))
self.validate_abspath(value)
_drive, tail = self.__split_drive(value)
if not tail:
return
unicode_filepath = to_str(tail)
byte_ct = len(unicode_filepath.encode(self._fs_encoding))
err_kwargs = {
ErrorAttrKey.REASON: ErrorReason.INVALID_LENGTH,
ErrorAttrKey.PLATFORM: self.platform,
ErrorAttrKey.FS_ENCODING: self._fs_encoding,
ErrorAttrKey.BYTE_COUNT: byte_ct,
}
if byte_ct > self.max_len:
raise ValidationError(
[
f"file path is too long: expected<={self.max_len:d} bytes, actual={byte_ct:d} bytes"
],
**err_kwargs,
)
if byte_ct < self.min_len:
raise ValidationError(
[
"file path is too short: expected>={:d} bytes, actual={:d} bytes".format(
self.min_len, byte_ct
)
],
**err_kwargs,
)
self._validate_reserved_keywords(unicode_filepath)
unicode_filepath = unicode_filepath.replace("\\", "/")
for entry in unicode_filepath.split("/"):
if not entry or entry in (".", ".."):
continue
self.__fname_validator._validate_reserved_keywords(entry)
if self._is_windows(include_universal=True):
self.__validate_win_filepath(unicode_filepath)
else:
self.__validate_unix_filepath(unicode_filepath)
def validate_abspath(self, value: PathType) -> None:
is_posix_abs = posixpath.isabs(value)
is_nt_abs = ntpath.isabs(value)
err_object = ValidationError(
description=(
"an invalid absolute file path ({}) for the platform ({}).".format(
value, self.platform.value
)
+ " to avoid the error, specify an appropriate platform corresponding to"
+ " the path format or 'auto'."
),
platform=self.platform,
reason=ErrorReason.MALFORMED_ABS_PATH,
)
if any([self._is_windows() and is_nt_abs, self._is_linux() and is_posix_abs]):
return
if self._is_universal() and any([is_posix_abs, is_nt_abs]):
ValidationError(
description=(
("POSIX style" if is_posix_abs else "NT style")
+ " absolute file path found. expected a platform-independent file path."
),
platform=self.platform,
reason=ErrorReason.MALFORMED_ABS_PATH,
)
if self._is_windows(include_universal=True) and is_posix_abs:
raise err_object
drive, _tail = ntpath.splitdrive(value)
if not self._is_windows() and drive and is_nt_abs:
raise err_object
def __validate_unix_filepath(self, unicode_filepath: str) -> None:
match = _RE_INVALID_PATH.findall(unicode_filepath)
if match:
raise InvalidCharError(
INVALID_CHAR_ERR_MSG_TMPL.format(
invalid=findall_to_str(match), value=repr(unicode_filepath)
)
)
def __validate_win_filepath(self, unicode_filepath: str) -> None:
match = _RE_INVALID_WIN_PATH.findall(unicode_filepath)
if match:
raise InvalidCharError(
INVALID_CHAR_ERR_MSG_TMPL.format(
invalid=findall_to_str(match), value=repr(unicode_filepath)
),
platform=Platform.WINDOWS,
)
_drive, value = self.__split_drive(unicode_filepath)
if value:
match_reserved = self._RE_NTFS_RESERVED.search(value)
if match_reserved:
reserved_name = match_reserved.group()
raise ReservedNameError(
f"'{reserved_name}' is a reserved name",
reusable_name=False,
reserved_name=reserved_name,
platform=self.platform,
)
[docs]
def validate_filepath(
file_path: PathType,
platform: Optional[PlatformType] = None,
min_len: int = DEFAULT_MIN_LEN,
max_len: Optional[int] = None,
fs_encoding: Optional[str] = None,
check_reserved: bool = True,
additional_reserved_names: Optional[Sequence[str]] = None,
) -> None:
"""Verifying whether the ``file_path`` is a valid file path or not.
Args:
file_path (PathType):
File path to be validated.
platform (Optional[PlatformType], optional):
Target platform name of the file path.
.. include:: platform.txt
min_len (int, optional):
Minimum byte length of the ``file_path``. The value must be greater or equal to one.
Defaults to ``1``.
max_len (Optional[int], optional):
Maximum byte length of the ``file_path``. If the value is |None| or minus,
automatically determined by the ``platform``:
- ``Linux``: 4096
- ``macOS``: 1024
- ``Windows``: 260
- ``universal``: 260
fs_encoding (Optional[str], optional):
Filesystem encoding that used to calculate the byte length of the file path.
If |None|, get the value from the execution environment.
check_reserved (bool, optional):
If |True|, check reserved names of the ``platform``.
Defaults to |True|.
additional_reserved_names (Optional[Sequence[str]], optional):
Additional reserved names to check.
Raises:
ValidationError (ErrorReason.INVALID_CHARACTER):
If the ``file_path`` includes invalid char(s):
|invalid_file_path_chars|.
The following characters are also invalid for Windows platforms:
|invalid_win_file_path_chars|
ValidationError (ErrorReason.INVALID_LENGTH):
If the ``file_path`` is longer than ``max_len`` characters.
ValidationError:
If ``file_path`` include invalid values.
Example:
:ref:`example-validate-file-path`
See Also:
`Naming Files, Paths, and Namespaces - Win32 apps | Microsoft Docs
<https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file>`__
"""
FilePathValidator(
platform=platform,
min_len=min_len,
max_len=-1 if max_len is None else max_len,
fs_encoding=fs_encoding,
check_reserved=check_reserved,
additional_reserved_names=additional_reserved_names,
).validate(file_path)
[docs]
def is_valid_filepath(
file_path: PathType,
platform: Optional[PlatformType] = None,
min_len: int = DEFAULT_MIN_LEN,
max_len: Optional[int] = None,
fs_encoding: Optional[str] = None,
check_reserved: bool = True,
additional_reserved_names: Optional[Sequence[str]] = None,
) -> bool:
"""Check whether the ``file_path`` is a valid name or not.
Args:
file_path:
A filepath to be checked.
platform:
Target platform name of the file path.
Example:
:ref:`example-is-valid-filepath`
See Also:
:py:func:`.validate_filepath()`
"""
return FilePathValidator(
platform=platform,
min_len=min_len,
max_len=-1 if max_len is None else max_len,
fs_encoding=fs_encoding,
check_reserved=check_reserved,
additional_reserved_names=additional_reserved_names,
).is_valid(file_path)
[docs]
def sanitize_filepath(
file_path: PathType,
replacement_text: str = "",
platform: Optional[PlatformType] = None,
max_len: Optional[int] = None,
fs_encoding: Optional[str] = None,
check_reserved: Optional[bool] = None,
null_value_handler: Optional[ValidationErrorHandler] = None,
reserved_name_handler: Optional[ValidationErrorHandler] = None,
additional_reserved_names: Optional[Sequence[str]] = None,
normalize: bool = True,
validate_after_sanitize: bool = False,
) -> PathType:
"""Make a valid file path from a string.
To make a valid file path, the function does the following:
- Replace invalid characters for a file path within the ``file_path``
with the ``replacement_text``. Invalid characters are as follows:
- unprintable characters
- |invalid_file_path_chars|
- for Windows (or universal) only: |invalid_win_file_path_chars|
- Replace a value if a sanitized value is a reserved name by operating systems
with a specified handler by ``reserved_name_handler``.
Args:
file_path:
File path to sanitize.
replacement_text:
Replacement text for invalid characters.
Defaults to ``""``.
platform:
Target platform name of the file path.
.. include:: platform.txt
max_len:
Maximum byte length of the file path.
Truncate the path if the value length exceeds the `max_len`.
If the value is |None| or minus, ``max_len`` will automatically determined by the ``platform``:
- ``Linux``: 4096
- ``macOS``: 1024
- ``Windows``: 260
- ``universal``: 260
fs_encoding:
Filesystem encoding that used to calculate the byte length of the file path.
If |None|, get the value from the execution environment.
check_reserved:
[Deprecated] Use 'reserved_name_handler' instead.
null_value_handler:
Function called when a value after sanitization is an empty string.
You can specify predefined handlers:
- :py:func:`.handler.NullValueHandler.return_null_string`
- :py:func:`.handler.NullValueHandler.return_timestamp`
- :py:func:`.handler.raise_error`
Defaults to :py:func:`.handler.NullValueHandler.return_null_string` that just return ``""``.
reserved_name_handler:
Function called when a value after sanitization is one of the reserved names.
You can specify predefined handlers:
- :py:meth:`~.handler.ReservedNameHandler.add_leading_underscore`
- :py:meth:`~.handler.ReservedNameHandler.add_trailing_underscore`
- :py:meth:`~.handler.ReservedNameHandler.as_is`
- :py:func:`~.handler.raise_error`
Defaults to :py:func:`.handler.add_trailing_underscore`.
additional_reserved_names:
Additional reserved names to sanitize.
Case insensitive.
normalize:
If |True|, normalize the the file path.
validate_after_sanitize:
Execute validation after sanitization to the file path.
Returns:
Same type as the argument (str or PathLike object):
Sanitized filepath.
Raises:
ValueError:
If the ``file_path`` is an invalid file path.
Example:
:ref:`example-sanitize-file-path`
"""
if check_reserved is not None:
warnings.warn(
"'check_reserved' is deprecated. Use 'reserved_name_handler' instead.",
DeprecationWarning,
)
if check_reserved is False:
reserved_name_handler = ReservedNameHandler.as_is
return FilePathSanitizer(
platform=platform,
max_len=-1 if max_len is None else max_len,
fs_encoding=fs_encoding,
normalize=normalize,
null_value_handler=null_value_handler,
reserved_name_handler=reserved_name_handler,
additional_reserved_names=additional_reserved_names,
validate_after_sanitize=validate_after_sanitize,
).sanitize(file_path, replacement_text)