466 lines
16 KiB
Python
466 lines
16 KiB
Python
|
import typing as t
|
||
|
|
from functools import update_wrapper
|
||
|
|
from io import BytesIO
|
||
|
|
from itertools import chain
|
||
|
|
from typing import Union
|
||
|
|
|
||
|
|
from . import exceptions
|
||
|
|
from .datastructures import FileStorage
|
||
|
|
from .datastructures import Headers
|
||
|
|
from .datastructures import MultiDict
|
||
|
|
from .http import parse_options_header
|
||
|
|
from .sansio.multipart import Data
|
||
|
|
from .sansio.multipart import Epilogue
|
||
|
|
from .sansio.multipart import Field
|
||
|
|
from .sansio.multipart import File
|
||
|
|
from .sansio.multipart import MultipartDecoder
|
||
|
|
from .sansio.multipart import NeedData
|
||
|
|
from .urls import url_decode_stream
|
||
|
|
from .wsgi import _make_chunk_iter
|
||
|
|
from .wsgi import get_content_length
|
||
|
|
from .wsgi import get_input_stream
|
||
|
|
|
||
|
|
# there are some platforms where SpooledTemporaryFile is not available.
|
||
|
|
# In that case we need to provide a fallback.
|
||
|
|
try:
|
||
|
|
from tempfile import SpooledTemporaryFile
|
||
|
|
except ImportError:
|
||
|
|
from tempfile import TemporaryFile
|
||
|
|
|
||
|
|
SpooledTemporaryFile = None # type: ignore
|
||
|
|
|
||
|
|
if t.TYPE_CHECKING:
|
||
|
|
import typing as te
|
||
|
|
from _typeshed.wsgi import WSGIEnvironment
|
||
|
|
|
||
|
|
t_parse_result = t.Tuple[t.IO[bytes], MultiDict, MultiDict]
|
||
|
|
|
||
|
|
class TStreamFactory(te.Protocol):
|
||
|
|
def __call__(
|
||
|
|
self,
|
||
|
|
total_content_length: t.Optional[int],
|
||
|
|
content_type: t.Optional[str],
|
||
|
|
filename: t.Optional[str],
|
||
|
|
content_length: t.Optional[int] = None,
|
||
|
|
) -> t.IO[bytes]:
|
||
|
|
...
|
||
|
|
|
||
|
|
|
||
|
|
F = t.TypeVar("F", bound=t.Callable[..., t.Any])
|
||
|
|
|
||
|
|
|
||
|
|
def _exhaust(stream: t.IO[bytes]) -> None:
|
||
|
|
bts = stream.read(64 * 1024)
|
||
|
|
while bts:
|
||
|
|
bts = stream.read(64 * 1024)
|
||
|
|
|
||
|
|
|
||
|
|
def default_stream_factory(
|
||
|
|
total_content_length: t.Optional[int],
|
||
|
|
content_type: t.Optional[str],
|
||
|
|
filename: t.Optional[str],
|
||
|
|
content_length: t.Optional[int] = None,
|
||
|
|
) -> t.IO[bytes]:
|
||
|
|
max_size = 1024 * 500
|
||
|
|
|
||
|
|
if SpooledTemporaryFile is not None:
|
||
|
|
return t.cast(t.IO[bytes], SpooledTemporaryFile(max_size=max_size, mode="rb+"))
|
||
|
|
elif total_content_length is None or total_content_length > max_size:
|
||
|
|
return t.cast(t.IO[bytes], TemporaryFile("rb+"))
|
||
|
|
|
||
|
|
return BytesIO()
|
||
|
|
|
||
|
|
|
||
|
|
def parse_form_data(
|
||
|
|
environ: "WSGIEnvironment",
|
||
|
|
stream_factory: t.Optional["TStreamFactory"] = None,
|
||
|
|
charset: str = "utf-8",
|
||
|
|
errors: str = "replace",
|
||
|
|
max_form_memory_size: t.Optional[int] = None,
|
||
|
|
max_content_length: t.Optional[int] = None,
|
||
|
|
cls: t.Optional[t.Type[MultiDict]] = None,
|
||
|
|
silent: bool = True,
|
||
|
|
) -> "t_parse_result":
|
||
|
|
"""Parse the form data in the environ and return it as tuple in the form
|
||
|
|
``(stream, form, files)``. You should only call this method if the
|
||
|
|
transport method is `POST`, `PUT`, or `PATCH`.
|
||
|
|
|
||
|
|
If the mimetype of the data transmitted is `multipart/form-data` the
|
||
|
|
files multidict will be filled with `FileStorage` objects. If the
|
||
|
|
mimetype is unknown the input stream is wrapped and returned as first
|
||
|
|
argument, else the stream is empty.
|
||
|
|
|
||
|
|
This is a shortcut for the common usage of :class:`FormDataParser`.
|
||
|
|
|
||
|
|
Have a look at :doc:`/request_data` for more details.
|
||
|
|
|
||
|
|
.. versionadded:: 0.5
|
||
|
|
The `max_form_memory_size`, `max_content_length` and
|
||
|
|
`cls` parameters were added.
|
||
|
|
|
||
|
|
.. versionadded:: 0.5.1
|
||
|
|
The optional `silent` flag was added.
|
||
|
|
|
||
|
|
:param environ: the WSGI environment to be used for parsing.
|
||
|
|
:param stream_factory: An optional callable that returns a new read and
|
||
|
|
writeable file descriptor. This callable works
|
||
|
|
the same as :meth:`Response._get_file_stream`.
|
||
|
|
:param charset: The character set for URL and url encoded form data.
|
||
|
|
:param errors: The encoding error behavior.
|
||
|
|
:param max_form_memory_size: the maximum number of bytes to be accepted for
|
||
|
|
in-memory stored form data. If the data
|
||
|
|
exceeds the value specified an
|
||
|
|
:exc:`~exceptions.RequestEntityTooLarge`
|
||
|
|
exception is raised.
|
||
|
|
:param max_content_length: If this is provided and the transmitted data
|
||
|
|
is longer than this value an
|
||
|
|
:exc:`~exceptions.RequestEntityTooLarge`
|
||
|
|
exception is raised.
|
||
|
|
:param cls: an optional dict class to use. If this is not specified
|
||
|
|
or `None` the default :class:`MultiDict` is used.
|
||
|
|
:param silent: If set to False parsing errors will not be caught.
|
||
|
|
:return: A tuple in the form ``(stream, form, files)``.
|
||
|
|
"""
|
||
|
|
return FormDataParser(
|
||
|
|
stream_factory,
|
||
|
|
charset,
|
||
|
|
errors,
|
||
|
|
max_form_memory_size,
|
||
|
|
max_content_length,
|
||
|
|
cls,
|
||
|
|
silent,
|
||
|
|
).parse_from_environ(environ)
|
||
|
|
|
||
|
|
|
||
|
|
def exhaust_stream(f: F) -> F:
|
||
|
|
"""Helper decorator for methods that exhausts the stream on return."""
|
||
|
|
|
||
|
|
def wrapper(self, stream, *args, **kwargs): # type: ignore
|
||
|
|
try:
|
||
|
|
return f(self, stream, *args, **kwargs)
|
||
|
|
finally:
|
||
|
|
exhaust = getattr(stream, "exhaust", None)
|
||
|
|
|
||
|
|
if exhaust is not None:
|
||
|
|
exhaust()
|
||
|
|
else:
|
||
|
|
while True:
|
||
|
|
chunk = stream.read(1024 * 64)
|
||
|
|
|
||
|
|
if not chunk:
|
||
|
|
break
|
||
|
|
|
||
|
|
return update_wrapper(t.cast(F, wrapper), f)
|
||
|
|
|
||
|
|
|
||
|
|
class FormDataParser:
|
||
|
|
"""This class implements parsing of form data for Werkzeug. By itself
|
||
|
|
it can parse multipart and url encoded form data. It can be subclassed
|
||
|
|
and extended but for most mimetypes it is a better idea to use the
|
||
|
|
untouched stream and expose it as separate attributes on a request
|
||
|
|
object.
|
||
|
|
|
||
|
|
.. versionadded:: 0.8
|
||
|
|
|
||
|
|
:param stream_factory: An optional callable that returns a new read and
|
||
|
|
writeable file descriptor. This callable works
|
||
|
|
the same as :meth:`Response._get_file_stream`.
|
||
|
|
:param charset: The character set for URL and url encoded form data.
|
||
|
|
:param errors: The encoding error behavior.
|
||
|
|
:param max_form_memory_size: the maximum number of bytes to be accepted for
|
||
|
|
in-memory stored form data. If the data
|
||
|
|
exceeds the value specified an
|
||
|
|
:exc:`~exceptions.RequestEntityTooLarge`
|
||
|
|
exception is raised.
|
||
|
|
:param max_content_length: If this is provided and the transmitted data
|
||
|
|
is longer than this value an
|
||
|
|
:exc:`~exceptions.RequestEntityTooLarge`
|
||
|
|
exception is raised.
|
||
|
|
:param cls: an optional dict class to use. If this is not specified
|
||
|
|
or `None` the default :class:`MultiDict` is used.
|
||
|
|
:param silent: If set to False parsing errors will not be caught.
|
||
|
|
:param max_form_parts: The maximum number of parts to be parsed. If this is
|
||
|
|
exceeded, a :exc:`~exceptions.RequestEntityTooLarge` exception is raised.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(
|
||
|
|
self,
|
||
|
|
stream_factory: t.Optional["TStreamFactory"] = None,
|
||
|
|
charset: str = "utf-8",
|
||
|
|
errors: str = "replace",
|
||
|
|
max_form_memory_size: t.Optional[int] = None,
|
||
|
|
max_content_length: t.Optional[int] = None,
|
||
|
|
cls: t.Optional[t.Type[MultiDict]] = None,
|
||
|
|
silent: bool = True,
|
||
|
|
*,
|
||
|
|
max_form_parts: t.Optional[int] = None,
|
||
|
|
) -> None:
|
||
|
|
if stream_factory is None:
|
||
|
|
stream_factory = default_stream_factory
|
||
|
|
|
||
|
|
self.stream_factory = stream_factory
|
||
|
|
self.charset = charset
|
||
|
|
self.errors = errors
|
||
|
|
self.max_form_memory_size = max_form_memory_size
|
||
|
|
self.max_content_length = max_content_length
|
||
|
|
self.max_form_parts = max_form_parts
|
||
|
|
|
||
|
|
if cls is None:
|
||
|
|
cls = MultiDict
|
||
|
|
|
||
|
|
self.cls = cls
|
||
|
|
self.silent = silent
|
||
|
|
|
||
|
|
def get_parse_func(
|
||
|
|
self, mimetype: str, options: t.Dict[str, str]
|
||
|
|
) -> t.Optional[
|
||
|
|
t.Callable[
|
||
|
|
["FormDataParser", t.IO[bytes], str, t.Optional[int], t.Dict[str, str]],
|
||
|
|
"t_parse_result",
|
||
|
|
]
|
||
|
|
]:
|
||
|
|
return self.parse_functions.get(mimetype)
|
||
|
|
|
||
|
|
def parse_from_environ(self, environ: "WSGIEnvironment") -> "t_parse_result":
|
||
|
|
"""Parses the information from the environment as form data.
|
||
|
|
|
||
|
|
:param environ: the WSGI environment to be used for parsing.
|
||
|
|
:return: A tuple in the form ``(stream, form, files)``.
|
||
|
|
"""
|
||
|
|
content_type = environ.get("CONTENT_TYPE", "")
|
||
|
|
content_length = get_content_length(environ)
|
||
|
|
mimetype, options = parse_options_header(content_type)
|
||
|
|
return self.parse(get_input_stream(environ), mimetype, content_length, options)
|
||
|
|
|
||
|
|
def parse(
|
||
|
|
self,
|
||
|
|
stream: t.IO[bytes],
|
||
|
|
mimetype: str,
|
||
|
|
content_length: t.Optional[int],
|
||
|
|
options: t.Optional[t.Dict[str, str]] = None,
|
||
|
|
) -> "t_parse_result":
|
||
|
|
"""Parses the information from the given stream, mimetype,
|
||
|
|
content length and mimetype parameters.
|
||
|
|
|
||
|
|
:param stream: an input stream
|
||
|
|
:param mimetype: the mimetype of the data
|
||
|
|
:param content_length: the content length of the incoming data
|
||
|
|
:param options: optional mimetype parameters (used for
|
||
|
|
the multipart boundary for instance)
|
||
|
|
:return: A tuple in the form ``(stream, form, files)``.
|
||
|
|
"""
|
||
|
|
if (
|
||
|
|
self.max_content_length is not None
|
||
|
|
and content_length is not None
|
||
|
|
and content_length > self.max_content_length
|
||
|
|
):
|
||
|
|
# if the input stream is not exhausted, firefox reports Connection Reset
|
||
|
|
_exhaust(stream)
|
||
|
|
raise exceptions.RequestEntityTooLarge()
|
||
|
|
|
||
|
|
if options is None:
|
||
|
|
options = {}
|
||
|
|
|
||
|
|
parse_func = self.get_parse_func(mimetype, options)
|
||
|
|
|
||
|
|
if parse_func is not None:
|
||
|
|
try:
|
||
|
|
return parse_func(self, stream, mimetype, content_length, options)
|
||
|
|
except ValueError:
|
||
|
|
if not self.silent:
|
||
|
|
raise
|
||
|
|
|
||
|
|
return stream, self.cls(), self.cls()
|
||
|
|
|
||
|
|
@exhaust_stream
|
||
|
|
def _parse_multipart(
|
||
|
|
self,
|
||
|
|
stream: t.IO[bytes],
|
||
|
|
mimetype: str,
|
||
|
|
content_length: t.Optional[int],
|
||
|
|
options: t.Dict[str, str],
|
||
|
|
) -> "t_parse_result":
|
||
|
|
parser = MultiPartParser(
|
||
|
|
self.stream_factory,
|
||
|
|
self.charset,
|
||
|
|
self.errors,
|
||
|
|
max_form_memory_size=self.max_form_memory_size,
|
||
|
|
cls=self.cls,
|
||
|
|
max_form_parts=self.max_form_parts,
|
||
|
|
)
|
||
|
|
boundary = options.get("boundary", "").encode("ascii")
|
||
|
|
|
||
|
|
if not boundary:
|
||
|
|
raise ValueError("Missing boundary")
|
||
|
|
|
||
|
|
form, files = parser.parse(stream, boundary, content_length)
|
||
|
|
return stream, form, files
|
||
|
|
|
||
|
|
@exhaust_stream
|
||
|
|
def _parse_urlencoded(
|
||
|
|
self,
|
||
|
|
stream: t.IO[bytes],
|
||
|
|
mimetype: str,
|
||
|
|
content_length: t.Optional[int],
|
||
|
|
options: t.Dict[str, str],
|
||
|
|
) -> "t_parse_result":
|
||
|
|
if (
|
||
|
|
self.max_form_memory_size is not None
|
||
|
|
and content_length is not None
|
||
|
|
and content_length > self.max_form_memory_size
|
||
|
|
):
|
||
|
|
# if the input stream is not exhausted, firefox reports Connection Reset
|
||
|
|
_exhaust(stream)
|
||
|
|
raise exceptions.RequestEntityTooLarge()
|
||
|
|
|
||
|
|
form = url_decode_stream(stream, self.charset, errors=self.errors, cls=self.cls)
|
||
|
|
return stream, form, self.cls()
|
||
|
|
|
||
|
|
#: mapping of mimetypes to parsing functions
|
||
|
|
parse_functions: t.Dict[
|
||
|
|
str,
|
||
|
|
t.Callable[
|
||
|
|
["FormDataParser", t.IO[bytes], str, t.Optional[int], t.Dict[str, str]],
|
||
|
|
"t_parse_result",
|
||
|
|
],
|
||
|
|
] = {
|
||
|
|
"multipart/form-data": _parse_multipart,
|
||
|
|
"application/x-www-form-urlencoded": _parse_urlencoded,
|
||
|
|
"application/x-url-encoded": _parse_urlencoded,
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
def _line_parse(line: str) -> t.Tuple[str, bool]:
|
||
|
|
"""Removes line ending characters and returns a tuple (`stripped_line`,
|
||
|
|
`is_terminated`).
|
||
|
|
"""
|
||
|
|
if line[-2:] == "\r\n":
|
||
|
|
return line[:-2], True
|
||
|
|
|
||
|
|
elif line[-1:] in {"\r", "\n"}:
|
||
|
|
return line[:-1], True
|
||
|
|
|
||
|
|
return line, False
|
||
|
|
|
||
|
|
|
||
|
|
class MultiPartParser:
|
||
|
|
def __init__(
|
||
|
|
self,
|
||
|
|
stream_factory: t.Optional["TStreamFactory"] = None,
|
||
|
|
charset: str = "utf-8",
|
||
|
|
errors: str = "replace",
|
||
|
|
max_form_memory_size: t.Optional[int] = None,
|
||
|
|
cls: t.Optional[t.Type[MultiDict]] = None,
|
||
|
|
buffer_size: int = 64 * 1024,
|
||
|
|
max_form_parts: t.Optional[int] = None,
|
||
|
|
) -> None:
|
||
|
|
self.charset = charset
|
||
|
|
self.errors = errors
|
||
|
|
self.max_form_memory_size = max_form_memory_size
|
||
|
|
self.max_form_parts = max_form_parts
|
||
|
|
|
||
|
|
if stream_factory is None:
|
||
|
|
stream_factory = default_stream_factory
|
||
|
|
|
||
|
|
self.stream_factory = stream_factory
|
||
|
|
|
||
|
|
if cls is None:
|
||
|
|
cls = MultiDict
|
||
|
|
|
||
|
|
self.cls = cls
|
||
|
|
|
||
|
|
self.buffer_size = buffer_size
|
||
|
|
|
||
|
|
def fail(self, message: str) -> "te.NoReturn":
|
||
|
|
raise ValueError(message)
|
||
|
|
|
||
|
|
def get_part_charset(self, headers: Headers) -> str:
|
||
|
|
# Figure out input charset for current part
|
||
|
|
content_type = headers.get("content-type")
|
||
|
|
|
||
|
|
if content_type:
|
||
|
|
mimetype, ct_params = parse_options_header(content_type)
|
||
|
|
return ct_params.get("charset", self.charset)
|
||
|
|
|
||
|
|
return self.charset
|
||
|
|
|
||
|
|
def start_file_streaming(
|
||
|
|
self, event: File, total_content_length: t.Optional[int]
|
||
|
|
) -> t.IO[bytes]:
|
||
|
|
content_type = event.headers.get("content-type")
|
||
|
|
|
||
|
|
try:
|
||
|
|
content_length = int(event.headers["content-length"])
|
||
|
|
except (KeyError, ValueError):
|
||
|
|
content_length = 0
|
||
|
|
|
||
|
|
container = self.stream_factory(
|
||
|
|
total_content_length=total_content_length,
|
||
|
|
filename=event.filename,
|
||
|
|
content_type=content_type,
|
||
|
|
content_length=content_length,
|
||
|
|
)
|
||
|
|
return container
|
||
|
|
|
||
|
|
def parse(
|
||
|
|
self, stream: t.IO[bytes], boundary: bytes, content_length: t.Optional[int]
|
||
|
|
) -> t.Tuple[MultiDict, MultiDict]:
|
||
|
|
container: t.Union[t.IO[bytes], t.List[bytes]]
|
||
|
|
_write: t.Callable[[bytes], t.Any]
|
||
|
|
|
||
|
|
iterator = chain(
|
||
|
|
_make_chunk_iter(
|
||
|
|
stream,
|
||
|
|
limit=content_length,
|
||
|
|
buffer_size=self.buffer_size,
|
||
|
|
),
|
||
|
|
[None],
|
||
|
|
)
|
||
|
|
|
||
|
|
parser = MultipartDecoder(
|
||
|
|
boundary, self.max_form_memory_size, max_parts=self.max_form_parts
|
||
|
|
)
|
||
|
|
|
||
|
|
fields = []
|
||
|
|
files = []
|
||
|
|
|
||
|
|
current_part: Union[Field, File]
|
||
|
|
for data in iterator:
|
||
|
|
parser.receive_data(data)
|
||
|
|
event = parser.next_event()
|
||
|
|
while not isinstance(event, (Epilogue, NeedData)):
|
||
|
|
if isinstance(event, Field):
|
||
|
|
current_part = event
|
||
|
|
container = []
|
||
|
|
_write = container.append
|
||
|
|
elif isinstance(event, File):
|
||
|
|
current_part = event
|
||
|
|
container = self.start_file_streaming(event, content_length)
|
||
|
|
_write = container.write
|
||
|
|
elif isinstance(event, Data):
|
||
|
|
_write(event.data)
|
||
|
|
if not event.more_data:
|
||
|
|
if isinstance(current_part, Field):
|
||
|
|
value = b"".join(container).decode(
|
||
|
|
self.get_part_charset(current_part.headers), self.errors
|
||
|
|
)
|
||
|
|
fields.append((current_part.name, value))
|
||
|
|
else:
|
||
|
|
container = t.cast(t.IO[bytes], container)
|
||
|
|
container.seek(0)
|
||
|
|
files.append(
|
||
|
|
(
|
||
|
|
current_part.name,
|
||
|
|
FileStorage(
|
||
|
|
container,
|
||
|
|
current_part.filename,
|
||
|
|
current_part.name,
|
||
|
|
headers=current_part.headers,
|
||
|
|
),
|
||
|
|
)
|
||
|
|
)
|
||
|
|
|
||
|
|
event = parser.next_event()
|
||
|
|
|
||
|
|
return self.cls(fields), self.cls(files)
|