205 lines
6.5 KiB
Python
205 lines
6.5 KiB
Python
import binascii
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import os
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import typing
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from pathlib import Path
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from ._transports.base import AsyncByteStream, SyncByteStream
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from ._types import FileContent, FileTypes, RequestFiles
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from ._utils import (
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format_form_param,
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guess_content_type,
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peek_filelike_length,
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primitive_value_to_str,
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to_bytes,
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)
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class DataField:
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"""
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A single form field item, within a multipart form field.
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"""
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def __init__(
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self, name: str, value: typing.Union[str, bytes, int, float, None]
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) -> None:
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if not isinstance(name, str):
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raise TypeError(
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f"Invalid type for name. Expected str, got {type(name)}: {name!r}"
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)
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if value is not None and not isinstance(value, (str, bytes, int, float)):
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raise TypeError(
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f"Invalid type for value. Expected primitive type, got {type(value)}: {value!r}"
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)
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self.name = name
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self.value: typing.Union[str, bytes] = (
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value if isinstance(value, bytes) else primitive_value_to_str(value)
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)
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def render_headers(self) -> bytes:
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if not hasattr(self, "_headers"):
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name = format_form_param("name", self.name)
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self._headers = b"".join(
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[b"Content-Disposition: form-data; ", name, b"\r\n\r\n"]
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)
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return self._headers
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def render_data(self) -> bytes:
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if not hasattr(self, "_data"):
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self._data = to_bytes(self.value)
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return self._data
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def get_length(self) -> int:
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headers = self.render_headers()
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data = self.render_data()
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return len(headers) + len(data)
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def render(self) -> typing.Iterator[bytes]:
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yield self.render_headers()
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yield self.render_data()
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class FileField:
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"""
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A single file field item, within a multipart form field.
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"""
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def __init__(self, name: str, value: FileTypes) -> None:
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self.name = name
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fileobj: FileContent
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if isinstance(value, tuple):
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try:
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filename, fileobj, content_type = value # type: ignore
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except ValueError:
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filename, fileobj = value # type: ignore
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content_type = guess_content_type(filename)
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else:
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filename = Path(str(getattr(value, "name", "upload"))).name
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fileobj = value
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content_type = guess_content_type(filename)
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self.filename = filename
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self.file = fileobj
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self.content_type = content_type
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self._consumed = False
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def get_length(self) -> int:
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headers = self.render_headers()
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if isinstance(self.file, (str, bytes)):
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return len(headers) + len(to_bytes(self.file))
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# Let's do our best not to read `file` into memory.
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file_length = peek_filelike_length(self.file)
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if file_length is None:
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# As a last resort, read file and cache contents for later.
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assert not hasattr(self, "_data")
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self._data = to_bytes(self.file.read())
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file_length = len(self._data)
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return len(headers) + file_length
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def render_headers(self) -> bytes:
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if not hasattr(self, "_headers"):
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parts = [
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b"Content-Disposition: form-data; ",
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format_form_param("name", self.name),
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]
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if self.filename:
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filename = format_form_param("filename", self.filename)
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parts.extend([b"; ", filename])
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if self.content_type is not None:
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content_type = self.content_type.encode()
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parts.extend([b"\r\nContent-Type: ", content_type])
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parts.append(b"\r\n\r\n")
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self._headers = b"".join(parts)
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return self._headers
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def render_data(self) -> typing.Iterator[bytes]:
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if isinstance(self.file, (str, bytes)):
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yield to_bytes(self.file)
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return
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if hasattr(self, "_data"):
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# Already rendered.
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yield self._data
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return
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if self._consumed: # pragma: nocover
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self.file.seek(0)
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self._consumed = True
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for chunk in self.file:
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yield to_bytes(chunk)
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def render(self) -> typing.Iterator[bytes]:
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yield self.render_headers()
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yield from self.render_data()
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class MultipartStream(SyncByteStream, AsyncByteStream):
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"""
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Request content as streaming multipart encoded form data.
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"""
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def __init__(self, data: dict, files: RequestFiles, boundary: bytes = None) -> None:
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if boundary is None:
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boundary = binascii.hexlify(os.urandom(16))
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self.boundary = boundary
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self.content_type = "multipart/form-data; boundary=%s" % boundary.decode(
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"ascii"
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)
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self.fields = list(self._iter_fields(data, files))
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def _iter_fields(
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self, data: dict, files: RequestFiles
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) -> typing.Iterator[typing.Union[FileField, DataField]]:
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for name, value in data.items():
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if isinstance(value, list):
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for item in value:
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yield DataField(name=name, value=item)
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else:
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yield DataField(name=name, value=value)
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file_items = files.items() if isinstance(files, typing.Mapping) else files
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for name, value in file_items:
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yield FileField(name=name, value=value)
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def iter_chunks(self) -> typing.Iterator[bytes]:
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for field in self.fields:
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yield b"--%s\r\n" % self.boundary
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yield from field.render()
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yield b"\r\n"
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yield b"--%s--\r\n" % self.boundary
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def iter_chunks_lengths(self) -> typing.Iterator[int]:
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boundary_length = len(self.boundary)
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# Follow closely what `.iter_chunks()` does.
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for field in self.fields:
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yield 2 + boundary_length + 2
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yield field.get_length()
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yield 2
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yield 2 + boundary_length + 4
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def get_content_length(self) -> int:
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return sum(self.iter_chunks_lengths())
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# Content stream interface.
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def get_headers(self) -> typing.Dict[str, str]:
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content_length = str(self.get_content_length())
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content_type = self.content_type
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return {"Content-Length": content_length, "Content-Type": content_type}
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def __iter__(self) -> typing.Iterator[bytes]:
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for chunk in self.iter_chunks():
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yield chunk
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async def __aiter__(self) -> typing.AsyncIterator[bytes]:
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for chunk in self.iter_chunks():
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yield chunk
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