mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-12-13 08:54:55 +01:00
244 lines
8.8 KiB
Python
244 lines
8.8 KiB
Python
|
import asyncio
|
||
|
|
import mimetypes
|
||
|
|
import os
|
||
|
|
import pathlib
|
||
|
|
import sys
|
||
|
|
from typing import ( # noqa
|
||
|
|
IO,
|
||
|
|
TYPE_CHECKING,
|
||
|
|
Any,
|
||
|
|
Awaitable,
|
||
|
|
Callable,
|
||
|
|
List,
|
||
|
|
Optional,
|
||
|
|
Union,
|
||
|
|
cast,
|
||
|
|
)
|
||
|
|
|
||
|
|
from . import hdrs
|
||
|
|
from .abc import AbstractStreamWriter
|
||
|
|
from .typedefs import LooseHeaders
|
||
|
|
from .web_exceptions import (
|
||
|
|
HTTPNotModified,
|
||
|
|
HTTPPartialContent,
|
||
|
|
HTTPPreconditionFailed,
|
||
|
|
HTTPRequestRangeNotSatisfiable,
|
||
|
|
)
|
||
|
|
from .web_response import StreamResponse
|
||
|
|
|
||
|
|
__all__ = ("FileResponse",)
|
||
|
|
|
||
|
|
if TYPE_CHECKING: # pragma: no cover
|
||
|
|
from .web_request import BaseRequest
|
||
|
|
|
||
|
|
|
||
|
|
_T_OnChunkSent = Optional[Callable[[bytes], Awaitable[None]]]
|
||
|
|
|
||
|
|
|
||
|
|
NOSENDFILE = bool(os.environ.get("AIOHTTP_NOSENDFILE"))
|
||
|
|
|
||
|
|
|
||
|
|
class FileResponse(StreamResponse):
|
||
|
|
"""A response object can be used to send files."""
|
||
|
|
|
||
|
|
def __init__(
|
||
|
|
self,
|
||
|
|
path: Union[str, pathlib.Path],
|
||
|
|
chunk_size: int = 256 * 1024,
|
||
|
|
status: int = 200,
|
||
|
|
reason: Optional[str] = None,
|
||
|
|
headers: Optional[LooseHeaders] = None,
|
||
|
|
) -> None:
|
||
|
|
super().__init__(status=status, reason=reason, headers=headers)
|
||
|
|
|
||
|
|
if isinstance(path, str):
|
||
|
|
path = pathlib.Path(path)
|
||
|
|
|
||
|
|
self._path = path
|
||
|
|
self._chunk_size = chunk_size
|
||
|
|
|
||
|
|
async def _sendfile_fallback(
|
||
|
|
self, writer: AbstractStreamWriter, fobj: IO[Any], offset: int, count: int
|
||
|
|
) -> AbstractStreamWriter:
|
||
|
|
# To keep memory usage low,fobj is transferred in chunks
|
||
|
|
# controlled by the constructor's chunk_size argument.
|
||
|
|
|
||
|
|
chunk_size = self._chunk_size
|
||
|
|
loop = asyncio.get_event_loop()
|
||
|
|
|
||
|
|
await loop.run_in_executor(None, fobj.seek, offset)
|
||
|
|
|
||
|
|
chunk = await loop.run_in_executor(None, fobj.read, chunk_size)
|
||
|
|
while chunk:
|
||
|
|
await writer.write(chunk)
|
||
|
|
count = count - chunk_size
|
||
|
|
if count <= 0:
|
||
|
|
break
|
||
|
|
chunk = await loop.run_in_executor(None, fobj.read, min(chunk_size, count))
|
||
|
|
|
||
|
|
await writer.drain()
|
||
|
|
return writer
|
||
|
|
|
||
|
|
async def _sendfile(
|
||
|
|
self, request: "BaseRequest", fobj: IO[Any], offset: int, count: int
|
||
|
|
) -> AbstractStreamWriter:
|
||
|
|
writer = await super().prepare(request)
|
||
|
|
assert writer is not None
|
||
|
|
|
||
|
|
if NOSENDFILE or sys.version_info < (3, 7) or self.compression:
|
||
|
|
return await self._sendfile_fallback(writer, fobj, offset, count)
|
||
|
|
|
||
|
|
loop = request._loop
|
||
|
|
transport = request.transport
|
||
|
|
assert transport is not None
|
||
|
|
|
||
|
|
try:
|
||
|
|
await loop.sendfile(transport, fobj, offset, count)
|
||
|
|
except NotImplementedError:
|
||
|
|
return await self._sendfile_fallback(writer, fobj, offset, count)
|
||
|
|
|
||
|
|
await super().write_eof()
|
||
|
|
return writer
|
||
|
|
|
||
|
|
async def prepare(self, request: "BaseRequest") -> Optional[AbstractStreamWriter]:
|
||
|
|
filepath = self._path
|
||
|
|
|
||
|
|
gzip = False
|
||
|
|
if "gzip" in request.headers.get(hdrs.ACCEPT_ENCODING, ""):
|
||
|
|
gzip_path = filepath.with_name(filepath.name + ".gz")
|
||
|
|
|
||
|
|
if gzip_path.is_file():
|
||
|
|
filepath = gzip_path
|
||
|
|
gzip = True
|
||
|
|
|
||
|
|
loop = asyncio.get_event_loop()
|
||
|
|
st = await loop.run_in_executor(None, filepath.stat)
|
||
|
|
|
||
|
|
modsince = request.if_modified_since
|
||
|
|
if modsince is not None and st.st_mtime <= modsince.timestamp():
|
||
|
|
self.set_status(HTTPNotModified.status_code)
|
||
|
|
self._length_check = False
|
||
|
|
# Delete any Content-Length headers provided by user. HTTP 304
|
||
|
|
# should always have empty response body
|
||
|
|
return await super().prepare(request)
|
||
|
|
|
||
|
|
unmodsince = request.if_unmodified_since
|
||
|
|
if unmodsince is not None and st.st_mtime > unmodsince.timestamp():
|
||
|
|
self.set_status(HTTPPreconditionFailed.status_code)
|
||
|
|
return await super().prepare(request)
|
||
|
|
|
||
|
|
if hdrs.CONTENT_TYPE not in self.headers:
|
||
|
|
ct, encoding = mimetypes.guess_type(str(filepath))
|
||
|
|
if not ct:
|
||
|
|
ct = "application/octet-stream"
|
||
|
|
should_set_ct = True
|
||
|
|
else:
|
||
|
|
encoding = "gzip" if gzip else None
|
||
|
|
should_set_ct = False
|
||
|
|
|
||
|
|
status = self._status
|
||
|
|
file_size = st.st_size
|
||
|
|
count = file_size
|
||
|
|
|
||
|
|
start = None
|
||
|
|
|
||
|
|
ifrange = request.if_range
|
||
|
|
if ifrange is None or st.st_mtime <= ifrange.timestamp():
|
||
|
|
# If-Range header check:
|
||
|
|
# condition = cached date >= last modification date
|
||
|
|
# return 206 if True else 200.
|
||
|
|
# if False:
|
||
|
|
# Range header would not be processed, return 200
|
||
|
|
# if True but Range header missing
|
||
|
|
# return 200
|
||
|
|
try:
|
||
|
|
rng = request.http_range
|
||
|
|
start = rng.start
|
||
|
|
end = rng.stop
|
||
|
|
except ValueError:
|
||
|
|
# https://tools.ietf.org/html/rfc7233:
|
||
|
|
# A server generating a 416 (Range Not Satisfiable) response to
|
||
|
|
# a byte-range request SHOULD send a Content-Range header field
|
||
|
|
# with an unsatisfied-range value.
|
||
|
|
# The complete-length in a 416 response indicates the current
|
||
|
|
# length of the selected representation.
|
||
|
|
#
|
||
|
|
# Will do the same below. Many servers ignore this and do not
|
||
|
|
# send a Content-Range header with HTTP 416
|
||
|
|
self.headers[hdrs.CONTENT_RANGE] = f"bytes */{file_size}"
|
||
|
|
self.set_status(HTTPRequestRangeNotSatisfiable.status_code)
|
||
|
|
return await super().prepare(request)
|
||
|
|
|
||
|
|
# If a range request has been made, convert start, end slice
|
||
|
|
# notation into file pointer offset and count
|
||
|
|
if start is not None or end is not None:
|
||
|
|
if start < 0 and end is None: # return tail of file
|
||
|
|
start += file_size
|
||
|
|
if start < 0:
|
||
|
|
# if Range:bytes=-1000 in request header but file size
|
||
|
|
# is only 200, there would be trouble without this
|
||
|
|
start = 0
|
||
|
|
count = file_size - start
|
||
|
|
else:
|
||
|
|
# rfc7233:If the last-byte-pos value is
|
||
|
|
# absent, or if the value is greater than or equal to
|
||
|
|
# the current length of the representation data,
|
||
|
|
# the byte range is interpreted as the remainder
|
||
|
|
# of the representation (i.e., the server replaces the
|
||
|
|
# value of last-byte-pos with a value that is one less than
|
||
|
|
# the current length of the selected representation).
|
||
|
|
count = (
|
||
|
|
min(end if end is not None else file_size, file_size) - start
|
||
|
|
)
|
||
|
|
|
||
|
|
if start >= file_size:
|
||
|
|
# HTTP 416 should be returned in this case.
|
||
|
|
#
|
||
|
|
# According to https://tools.ietf.org/html/rfc7233:
|
||
|
|
# If a valid byte-range-set includes at least one
|
||
|
|
# byte-range-spec with a first-byte-pos that is less than
|
||
|
|
# the current length of the representation, or at least one
|
||
|
|
# suffix-byte-range-spec with a non-zero suffix-length,
|
||
|
|
# then the byte-range-set is satisfiable. Otherwise, the
|
||
|
|
# byte-range-set is unsatisfiable.
|
||
|
|
self.headers[hdrs.CONTENT_RANGE] = f"bytes */{file_size}"
|
||
|
|
self.set_status(HTTPRequestRangeNotSatisfiable.status_code)
|
||
|
|
return await super().prepare(request)
|
||
|
|
|
||
|
|
status = HTTPPartialContent.status_code
|
||
|
|
# Even though you are sending the whole file, you should still
|
||
|
|
# return a HTTP 206 for a Range request.
|
||
|
|
self.set_status(status)
|
||
|
|
|
||
|
|
if should_set_ct:
|
||
|
|
self.content_type = ct # type: ignore
|
||
|
|
if encoding:
|
||
|
|
self.headers[hdrs.CONTENT_ENCODING] = encoding
|
||
|
|
if gzip:
|
||
|
|
self.headers[hdrs.VARY] = hdrs.ACCEPT_ENCODING
|
||
|
|
self.last_modified = st.st_mtime # type: ignore
|
||
|
|
self.content_length = count
|
||
|
|
|
||
|
|
self.headers[hdrs.ACCEPT_RANGES] = "bytes"
|
||
|
|
|
||
|
|
real_start = cast(int, start)
|
||
|
|
|
||
|
|
if status == HTTPPartialContent.status_code:
|
||
|
|
self.headers[hdrs.CONTENT_RANGE] = "bytes {}-{}/{}".format(
|
||
|
|
real_start, real_start + count - 1, file_size
|
||
|
|
)
|
||
|
|
|
||
|
|
if request.method == hdrs.METH_HEAD or self.status in [204, 304]:
|
||
|
|
return await super().prepare(request)
|
||
|
|
|
||
|
|
fobj = await loop.run_in_executor(None, filepath.open, "rb")
|
||
|
|
if start: # be aware that start could be None or int=0 here.
|
||
|
|
offset = start
|
||
|
|
else:
|
||
|
|
offset = 0
|
||
|
|
|
||
|
|
try:
|
||
|
|
return await self._sendfile(request, fobj, offset, count)
|
||
|
|
finally:
|
||
|
|
await loop.run_in_executor(None, fobj.close)
|