197 lines
6.0 KiB
Python
197 lines
6.0 KiB
Python
from __future__ import annotations
|
|
|
|
import mimetypes
|
|
from io import BytesIO
|
|
from os import fsdecode
|
|
from os import fspath
|
|
|
|
from .._internal import _plain_int
|
|
from .structures import MultiDict
|
|
|
|
|
|
class FileStorage:
|
|
"""The :class:`FileStorage` class is a thin wrapper over incoming files.
|
|
It is used by the request object to represent uploaded files. All the
|
|
attributes of the wrapper stream are proxied by the file storage so
|
|
it's possible to do ``storage.read()`` instead of the long form
|
|
``storage.stream.read()``.
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
stream=None,
|
|
filename=None,
|
|
name=None,
|
|
content_type=None,
|
|
content_length=None,
|
|
headers=None,
|
|
):
|
|
self.name = name
|
|
self.stream = stream or BytesIO()
|
|
|
|
# If no filename is provided, attempt to get the filename from
|
|
# the stream object. Python names special streams like
|
|
# ``<stderr>`` with angular brackets, skip these streams.
|
|
if filename is None:
|
|
filename = getattr(stream, "name", None)
|
|
|
|
if filename is not None:
|
|
filename = fsdecode(filename)
|
|
|
|
if filename and filename[0] == "<" and filename[-1] == ">":
|
|
filename = None
|
|
else:
|
|
filename = fsdecode(filename)
|
|
|
|
self.filename = filename
|
|
|
|
if headers is None:
|
|
from .headers import Headers
|
|
|
|
headers = Headers()
|
|
self.headers = headers
|
|
if content_type is not None:
|
|
headers["Content-Type"] = content_type
|
|
if content_length is not None:
|
|
headers["Content-Length"] = str(content_length)
|
|
|
|
def _parse_content_type(self):
|
|
if not hasattr(self, "_parsed_content_type"):
|
|
self._parsed_content_type = http.parse_options_header(self.content_type)
|
|
|
|
@property
|
|
def content_type(self):
|
|
"""The content-type sent in the header. Usually not available"""
|
|
return self.headers.get("content-type")
|
|
|
|
@property
|
|
def content_length(self):
|
|
"""The content-length sent in the header. Usually not available"""
|
|
if "content-length" in self.headers:
|
|
try:
|
|
return _plain_int(self.headers["content-length"])
|
|
except ValueError:
|
|
pass
|
|
|
|
return 0
|
|
|
|
@property
|
|
def mimetype(self):
|
|
"""Like :attr:`content_type`, but without parameters (eg, without
|
|
charset, type etc.) and always lowercase. For example if the content
|
|
type is ``text/HTML; charset=utf-8`` the mimetype would be
|
|
``'text/html'``.
|
|
|
|
.. versionadded:: 0.7
|
|
"""
|
|
self._parse_content_type()
|
|
return self._parsed_content_type[0].lower()
|
|
|
|
@property
|
|
def mimetype_params(self):
|
|
"""The mimetype parameters as dict. For example if the content
|
|
type is ``text/html; charset=utf-8`` the params would be
|
|
``{'charset': 'utf-8'}``.
|
|
|
|
.. versionadded:: 0.7
|
|
"""
|
|
self._parse_content_type()
|
|
return self._parsed_content_type[1]
|
|
|
|
def save(self, dst, buffer_size=16384):
|
|
"""Save the file to a destination path or file object. If the
|
|
destination is a file object you have to close it yourself after the
|
|
call. The buffer size is the number of bytes held in memory during
|
|
the copy process. It defaults to 16KB.
|
|
|
|
For secure file saving also have a look at :func:`secure_filename`.
|
|
|
|
:param dst: a filename, :class:`os.PathLike`, or open file
|
|
object to write to.
|
|
:param buffer_size: Passed as the ``length`` parameter of
|
|
:func:`shutil.copyfileobj`.
|
|
|
|
.. versionchanged:: 1.0
|
|
Supports :mod:`pathlib`.
|
|
"""
|
|
from shutil import copyfileobj
|
|
|
|
close_dst = False
|
|
|
|
if hasattr(dst, "__fspath__"):
|
|
dst = fspath(dst)
|
|
|
|
if isinstance(dst, str):
|
|
dst = open(dst, "wb")
|
|
close_dst = True
|
|
|
|
try:
|
|
copyfileobj(self.stream, dst, buffer_size)
|
|
finally:
|
|
if close_dst:
|
|
dst.close()
|
|
|
|
def close(self):
|
|
"""Close the underlying file if possible."""
|
|
try:
|
|
self.stream.close()
|
|
except Exception:
|
|
pass
|
|
|
|
def __bool__(self):
|
|
return bool(self.filename)
|
|
|
|
def __getattr__(self, name):
|
|
try:
|
|
return getattr(self.stream, name)
|
|
except AttributeError:
|
|
# SpooledTemporaryFile doesn't implement IOBase, get the
|
|
# attribute from its backing file instead.
|
|
# https://github.com/python/cpython/pull/3249
|
|
if hasattr(self.stream, "_file"):
|
|
return getattr(self.stream._file, name)
|
|
raise
|
|
|
|
def __iter__(self):
|
|
return iter(self.stream)
|
|
|
|
def __repr__(self):
|
|
return f"<{type(self).__name__}: {self.filename!r} ({self.content_type!r})>"
|
|
|
|
|
|
class FileMultiDict(MultiDict):
|
|
"""A special :class:`MultiDict` that has convenience methods to add
|
|
files to it. This is used for :class:`EnvironBuilder` and generally
|
|
useful for unittesting.
|
|
|
|
.. versionadded:: 0.5
|
|
"""
|
|
|
|
def add_file(self, name, file, filename=None, content_type=None):
|
|
"""Adds a new file to the dict. `file` can be a file name or
|
|
a :class:`file`-like or a :class:`FileStorage` object.
|
|
|
|
:param name: the name of the field.
|
|
:param file: a filename or :class:`file`-like object
|
|
:param filename: an optional filename
|
|
:param content_type: an optional content type
|
|
"""
|
|
if isinstance(file, FileStorage):
|
|
value = file
|
|
else:
|
|
if isinstance(file, str):
|
|
if filename is None:
|
|
filename = file
|
|
file = open(file, "rb")
|
|
if filename and content_type is None:
|
|
content_type = (
|
|
mimetypes.guess_type(filename)[0] or "application/octet-stream"
|
|
)
|
|
value = FileStorage(file, filename, name, content_type)
|
|
|
|
self.add(name, value)
|
|
|
|
|
|
# circular dependencies
|
|
from .. import http
|