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Current File : /opt/cloudlinux/venv/lib64/python3.11/site-packages/aiohttp/web_fileresponse.py
import asyncio
import mimetypes
import os
import pathlib
from typing import (  # noqa
    IO,
    TYPE_CHECKING,
    Any,
    Awaitable,
    Callable,
    Final,
    Iterator,
    List,
    Optional,
    Tuple,
    Union,
    cast,
)

from . import hdrs
from .abc import AbstractStreamWriter
from .helpers import ETAG_ANY, ETag, must_be_empty_body
from .typedefs import LooseHeaders, PathLike
from .web_exceptions import (
    HTTPNotModified,
    HTTPPartialContent,
    HTTPPreconditionFailed,
    HTTPRequestRangeNotSatisfiable,
)
from .web_response import StreamResponse

__all__ = ("FileResponse",)

if TYPE_CHECKING:
    from .web_request import BaseRequest


_T_OnChunkSent = Optional[Callable[[bytes], Awaitable[None]]]


NOSENDFILE: Final[bool] = bool(os.environ.get("AIOHTTP_NOSENDFILE"))


class FileResponse(StreamResponse):
    """A response object can be used to send files."""

    def __init__(
        self,
        path: PathLike,
        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)

        self._path = pathlib.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 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

    @staticmethod
    def _strong_etag_match(etag_value: str, etags: Tuple[ETag, ...]) -> bool:
        if len(etags) == 1 and etags[0].value == ETAG_ANY:
            return True
        return any(etag.value == etag_value for etag in etags if not etag.is_weak)

    async def _not_modified(
        self, request: "BaseRequest", etag_value: str, last_modified: float
    ) -> Optional[AbstractStreamWriter]:
        self.set_status(HTTPNotModified.status_code)
        self._length_check = False
        self.etag = etag_value  # type: ignore[assignment]
        self.last_modified = last_modified  # type: ignore[assignment]
        # Delete any Content-Length headers provided by user. HTTP 304
        # should always have empty response body
        return await super().prepare(request)

    async def _precondition_failed(
        self, request: "BaseRequest"
    ) -> Optional[AbstractStreamWriter]:
        self.set_status(HTTPPreconditionFailed.status_code)
        self.content_length = 0
        return await super().prepare(request)

    def _get_file_path_stat_and_gzip(
        self, check_for_gzipped_file: bool
    ) -> Tuple[pathlib.Path, os.stat_result, bool]:
        """Return the file path, stat result, and gzip status.

        This method should be called from a thread executor
        since it calls os.stat which may block.
        """
        filepath = self._path
        if check_for_gzipped_file:
            gzip_path = filepath.with_name(filepath.name + ".gz")
            try:
                return gzip_path, gzip_path.stat(), True
            except OSError:
                # Fall through and try the non-gzipped file
                pass

        return filepath, filepath.stat(), False

    async def prepare(self, request: "BaseRequest") -> Optional[AbstractStreamWriter]:
        loop = asyncio.get_event_loop()
        check_for_gzipped_file = "gzip" in request.headers.get(hdrs.ACCEPT_ENCODING, "")
        filepath, st, gzip = await loop.run_in_executor(
            None, self._get_file_path_stat_and_gzip, check_for_gzipped_file
        )

        etag_value = f"{st.st_mtime_ns:x}-{st.st_size:x}"
        last_modified = st.st_mtime

        # https://tools.ietf.org/html/rfc7232#section-6
        ifmatch = request.if_match
        if ifmatch is not None and not self._strong_etag_match(etag_value, ifmatch):
            return await self._precondition_failed(request)

        unmodsince = request.if_unmodified_since
        if (
            unmodsince is not None
            and ifmatch is None
            and st.st_mtime > unmodsince.timestamp()
        ):
            return await self._precondition_failed(request)

        ifnonematch = request.if_none_match
        if ifnonematch is not None and self._strong_etag_match(etag_value, ifnonematch):
            return await self._not_modified(request, etag_value, last_modified)

        modsince = request.if_modified_since
        if (
            modsince is not None
            and ifnonematch is None
            and st.st_mtime <= modsince.timestamp()
        ):
            return await self._not_modified(request, etag_value, last_modified)

        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[assignment]
        if encoding:
            self.headers[hdrs.CONTENT_ENCODING] = encoding
        if gzip:
            self.headers[hdrs.VARY] = hdrs.ACCEPT_ENCODING
            # Disable compression if we are already sending
            # a compressed file since we don't want to double
            # compress.
            self._compression = False

        self.etag = etag_value  # type: ignore[assignment]
        self.last_modified = st.st_mtime  # type: ignore[assignment]
        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 we are sending 0 bytes calling sendfile() will throw a ValueError
        if count == 0 or must_be_empty_body(request.method, self.status):
            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 asyncio.shield(loop.run_in_executor(None, fobj.close))

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