mirror of
https://mau.dev/maunium/synapse.git
synced 2024-10-01 01:36:05 -04:00
9edb725ebc
[MSC3916](https://github.com/matrix-org/matrix-spec-proposals/blob/rav/authentication-for-media/proposals/3916-authentication-for-media.md) adds new media endpoints under `_matrix/client`. This PR adds the `/preview_url`, `/config`, and `/thumbnail` endpoints. `/download` will be added in a follow-up PR once the work for the federation `/download` endpoint is complete (see https://github.com/element-hq/synapse/pull/17172). Should be reviewable commit-by-commit.
718 lines
26 KiB
Python
718 lines
26 KiB
Python
#
|
|
# This file is licensed under the Affero General Public License (AGPL) version 3.
|
|
#
|
|
# Copyright 2020-2021 The Matrix.org Foundation C.I.C.
|
|
# Copyright 2014-2016 OpenMarket Ltd
|
|
# Copyright (C) 2023 New Vector, Ltd
|
|
#
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU Affero General Public License as
|
|
# published by the Free Software Foundation, either version 3 of the
|
|
# License, or (at your option) any later version.
|
|
#
|
|
# See the GNU Affero General Public License for more details:
|
|
# <https://www.gnu.org/licenses/agpl-3.0.html>.
|
|
#
|
|
# Originally licensed under the Apache License, Version 2.0:
|
|
# <http://www.apache.org/licenses/LICENSE-2.0>.
|
|
#
|
|
# [This file includes modifications made by New Vector Limited]
|
|
#
|
|
#
|
|
import logging
|
|
from io import BytesIO
|
|
from types import TracebackType
|
|
from typing import TYPE_CHECKING, List, Optional, Tuple, Type
|
|
|
|
from PIL import Image
|
|
|
|
from synapse.api.errors import Codes, SynapseError, cs_error
|
|
from synapse.config.repository import THUMBNAIL_SUPPORTED_MEDIA_FORMAT_MAP
|
|
from synapse.http.server import respond_with_json
|
|
from synapse.http.site import SynapseRequest
|
|
from synapse.logging.opentracing import trace
|
|
from synapse.media._base import (
|
|
FileInfo,
|
|
ThumbnailInfo,
|
|
respond_404,
|
|
respond_with_file,
|
|
respond_with_responder,
|
|
)
|
|
from synapse.media.media_storage import MediaStorage
|
|
|
|
if TYPE_CHECKING:
|
|
from synapse.media.media_repository import MediaRepository
|
|
from synapse.server import HomeServer
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
EXIF_ORIENTATION_TAG = 0x0112
|
|
EXIF_TRANSPOSE_MAPPINGS = {
|
|
2: Image.FLIP_LEFT_RIGHT,
|
|
3: Image.ROTATE_180,
|
|
4: Image.FLIP_TOP_BOTTOM,
|
|
5: Image.TRANSPOSE,
|
|
6: Image.ROTATE_270,
|
|
7: Image.TRANSVERSE,
|
|
8: Image.ROTATE_90,
|
|
}
|
|
|
|
|
|
class ThumbnailError(Exception):
|
|
"""An error occurred generating a thumbnail."""
|
|
|
|
|
|
class Thumbnailer:
|
|
FORMATS = {"image/jpeg": "JPEG", "image/png": "PNG"}
|
|
|
|
@staticmethod
|
|
def set_limits(max_image_pixels: int) -> None:
|
|
Image.MAX_IMAGE_PIXELS = max_image_pixels
|
|
|
|
def __init__(self, input_path: str):
|
|
# Have we closed the image?
|
|
self._closed = False
|
|
|
|
try:
|
|
self.image = Image.open(input_path)
|
|
except OSError as e:
|
|
# If an error occurs opening the image, a thumbnail won't be able to
|
|
# be generated.
|
|
raise ThumbnailError from e
|
|
except Image.DecompressionBombError as e:
|
|
# If an image decompression bomb error occurs opening the image,
|
|
# then the image exceeds the pixel limit and a thumbnail won't
|
|
# be able to be generated.
|
|
raise ThumbnailError from e
|
|
|
|
self.width, self.height = self.image.size
|
|
self.transpose_method = None
|
|
try:
|
|
# We don't use ImageOps.exif_transpose since it crashes with big EXIF
|
|
#
|
|
# Ignore safety: Pillow seems to acknowledge that this method is
|
|
# "private, experimental, but generally widely used". Pillow 6
|
|
# includes a public getexif() method (no underscore) that we might
|
|
# consider using instead when we can bump that dependency.
|
|
#
|
|
# At the time of writing, Debian buster (currently oldstable)
|
|
# provides version 5.4.1. It's expected to EOL in mid-2022, see
|
|
# https://wiki.debian.org/DebianReleases#Production_Releases
|
|
image_exif = self.image._getexif() # type: ignore
|
|
if image_exif is not None:
|
|
image_orientation = image_exif.get(EXIF_ORIENTATION_TAG)
|
|
assert type(image_orientation) is int # noqa: E721
|
|
self.transpose_method = EXIF_TRANSPOSE_MAPPINGS.get(image_orientation)
|
|
except Exception as e:
|
|
# A lot of parsing errors can happen when parsing EXIF
|
|
logger.info("Error parsing image EXIF information: %s", e)
|
|
|
|
@trace
|
|
def transpose(self) -> Tuple[int, int]:
|
|
"""Transpose the image using its EXIF Orientation tag
|
|
|
|
Returns:
|
|
A tuple containing the new image size in pixels as (width, height).
|
|
"""
|
|
if self.transpose_method is not None:
|
|
# Safety: `transpose` takes an int rather than e.g. an IntEnum.
|
|
# self.transpose_method is set above to be a value in
|
|
# EXIF_TRANSPOSE_MAPPINGS, and that only contains correct values.
|
|
with self.image:
|
|
self.image = self.image.transpose(self.transpose_method) # type: ignore[arg-type]
|
|
self.width, self.height = self.image.size
|
|
self.transpose_method = None
|
|
# We don't need EXIF any more
|
|
self.image.info["exif"] = None
|
|
return self.image.size
|
|
|
|
def aspect(self, max_width: int, max_height: int) -> Tuple[int, int]:
|
|
"""Calculate the largest size that preserves aspect ratio which
|
|
fits within the given rectangle::
|
|
|
|
(w_in / h_in) = (w_out / h_out)
|
|
w_out = max(min(w_max, h_max * (w_in / h_in)), 1)
|
|
h_out = max(min(h_max, w_max * (h_in / w_in)), 1)
|
|
|
|
Args:
|
|
max_width: The largest possible width.
|
|
max_height: The largest possible height.
|
|
"""
|
|
|
|
if max_width * self.height < max_height * self.width:
|
|
return max_width, max((max_width * self.height) // self.width, 1)
|
|
else:
|
|
return max((max_height * self.width) // self.height, 1), max_height
|
|
|
|
def _resize(self, width: int, height: int) -> Image.Image:
|
|
# 1-bit or 8-bit color palette images need converting to RGB
|
|
# otherwise they will be scaled using nearest neighbour which
|
|
# looks awful.
|
|
#
|
|
# If the image has transparency, use RGBA instead.
|
|
if self.image.mode in ["1", "L", "P"]:
|
|
if self.image.info.get("transparency", None) is not None:
|
|
with self.image:
|
|
self.image = self.image.convert("RGBA")
|
|
else:
|
|
with self.image:
|
|
self.image = self.image.convert("RGB")
|
|
return self.image.resize((width, height), Image.LANCZOS)
|
|
|
|
@trace
|
|
def scale(self, width: int, height: int, output_type: str) -> BytesIO:
|
|
"""Rescales the image to the given dimensions.
|
|
|
|
Returns:
|
|
The bytes of the encoded image ready to be written to disk
|
|
"""
|
|
with self._resize(width, height) as scaled:
|
|
return self._encode_image(scaled, output_type)
|
|
|
|
@trace
|
|
def crop(self, width: int, height: int, output_type: str) -> BytesIO:
|
|
"""Rescales and crops the image to the given dimensions preserving
|
|
aspect::
|
|
(w_in / h_in) = (w_scaled / h_scaled)
|
|
w_scaled = max(w_out, h_out * (w_in / h_in))
|
|
h_scaled = max(h_out, w_out * (h_in / w_in))
|
|
|
|
Args:
|
|
max_width: The largest possible width.
|
|
max_height: The largest possible height.
|
|
|
|
Returns:
|
|
The bytes of the encoded image ready to be written to disk
|
|
"""
|
|
if width * self.height > height * self.width:
|
|
scaled_width = width
|
|
scaled_height = (width * self.height) // self.width
|
|
crop_top = (scaled_height - height) // 2
|
|
crop_bottom = height + crop_top
|
|
crop = (0, crop_top, width, crop_bottom)
|
|
else:
|
|
scaled_width = (height * self.width) // self.height
|
|
scaled_height = height
|
|
crop_left = (scaled_width - width) // 2
|
|
crop_right = width + crop_left
|
|
crop = (crop_left, 0, crop_right, height)
|
|
|
|
with self._resize(scaled_width, scaled_height) as scaled_image:
|
|
with scaled_image.crop(crop) as cropped:
|
|
return self._encode_image(cropped, output_type)
|
|
|
|
def _encode_image(self, output_image: Image.Image, output_type: str) -> BytesIO:
|
|
output_bytes_io = BytesIO()
|
|
fmt = self.FORMATS[output_type]
|
|
if fmt == "JPEG":
|
|
output_image = output_image.convert("RGB")
|
|
output_image.save(output_bytes_io, fmt, quality=80)
|
|
return output_bytes_io
|
|
|
|
def close(self) -> None:
|
|
"""Closes the underlying image file.
|
|
|
|
Once closed no other functions can be called.
|
|
|
|
Can be called multiple times.
|
|
"""
|
|
|
|
if self._closed:
|
|
return
|
|
|
|
self._closed = True
|
|
|
|
# Since we run this on the finalizer then we need to handle `__init__`
|
|
# raising an exception before it can define `self.image`.
|
|
image = getattr(self, "image", None)
|
|
if image is None:
|
|
return
|
|
|
|
image.close()
|
|
|
|
def __enter__(self) -> "Thumbnailer":
|
|
"""Make `Thumbnailer` a context manager that calls `close` on
|
|
`__exit__`.
|
|
"""
|
|
return self
|
|
|
|
def __exit__(
|
|
self,
|
|
type: Optional[Type[BaseException]],
|
|
value: Optional[BaseException],
|
|
traceback: Optional[TracebackType],
|
|
) -> None:
|
|
self.close()
|
|
|
|
def __del__(self) -> None:
|
|
# Make sure we actually do close the image, rather than leak data.
|
|
self.close()
|
|
|
|
|
|
class ThumbnailProvider:
|
|
def __init__(
|
|
self,
|
|
hs: "HomeServer",
|
|
media_repo: "MediaRepository",
|
|
media_storage: MediaStorage,
|
|
):
|
|
self.hs = hs
|
|
self.media_repo = media_repo
|
|
self.media_storage = media_storage
|
|
self.store = hs.get_datastores().main
|
|
self.dynamic_thumbnails = hs.config.media.dynamic_thumbnails
|
|
|
|
async def respond_local_thumbnail(
|
|
self,
|
|
request: SynapseRequest,
|
|
media_id: str,
|
|
width: int,
|
|
height: int,
|
|
method: str,
|
|
m_type: str,
|
|
max_timeout_ms: int,
|
|
) -> None:
|
|
media_info = await self.media_repo.get_local_media_info(
|
|
request, media_id, max_timeout_ms
|
|
)
|
|
if not media_info:
|
|
return
|
|
|
|
thumbnail_infos = await self.store.get_local_media_thumbnails(media_id)
|
|
await self._select_and_respond_with_thumbnail(
|
|
request,
|
|
width,
|
|
height,
|
|
method,
|
|
m_type,
|
|
thumbnail_infos,
|
|
media_id,
|
|
media_id,
|
|
url_cache=bool(media_info.url_cache),
|
|
server_name=None,
|
|
)
|
|
|
|
async def select_or_generate_local_thumbnail(
|
|
self,
|
|
request: SynapseRequest,
|
|
media_id: str,
|
|
desired_width: int,
|
|
desired_height: int,
|
|
desired_method: str,
|
|
desired_type: str,
|
|
max_timeout_ms: int,
|
|
) -> None:
|
|
media_info = await self.media_repo.get_local_media_info(
|
|
request, media_id, max_timeout_ms
|
|
)
|
|
|
|
if not media_info:
|
|
return
|
|
|
|
thumbnail_infos = await self.store.get_local_media_thumbnails(media_id)
|
|
for info in thumbnail_infos:
|
|
t_w = info.width == desired_width
|
|
t_h = info.height == desired_height
|
|
t_method = info.method == desired_method
|
|
t_type = info.type == desired_type
|
|
|
|
if t_w and t_h and t_method and t_type:
|
|
file_info = FileInfo(
|
|
server_name=None,
|
|
file_id=media_id,
|
|
url_cache=bool(media_info.url_cache),
|
|
thumbnail=info,
|
|
)
|
|
|
|
responder = await self.media_storage.fetch_media(file_info)
|
|
if responder:
|
|
await respond_with_responder(
|
|
request, responder, info.type, info.length
|
|
)
|
|
return
|
|
|
|
logger.debug("We don't have a thumbnail of that size. Generating")
|
|
|
|
# Okay, so we generate one.
|
|
file_path = await self.media_repo.generate_local_exact_thumbnail(
|
|
media_id,
|
|
desired_width,
|
|
desired_height,
|
|
desired_method,
|
|
desired_type,
|
|
url_cache=bool(media_info.url_cache),
|
|
)
|
|
|
|
if file_path:
|
|
await respond_with_file(request, desired_type, file_path)
|
|
else:
|
|
logger.warning("Failed to generate thumbnail")
|
|
raise SynapseError(400, "Failed to generate thumbnail.")
|
|
|
|
async def select_or_generate_remote_thumbnail(
|
|
self,
|
|
request: SynapseRequest,
|
|
server_name: str,
|
|
media_id: str,
|
|
desired_width: int,
|
|
desired_height: int,
|
|
desired_method: str,
|
|
desired_type: str,
|
|
max_timeout_ms: int,
|
|
) -> None:
|
|
media_info = await self.media_repo.get_remote_media_info(
|
|
server_name, media_id, max_timeout_ms
|
|
)
|
|
if not media_info:
|
|
respond_404(request)
|
|
return
|
|
|
|
thumbnail_infos = await self.store.get_remote_media_thumbnails(
|
|
server_name, media_id
|
|
)
|
|
|
|
file_id = media_info.filesystem_id
|
|
|
|
for info in thumbnail_infos:
|
|
t_w = info.width == desired_width
|
|
t_h = info.height == desired_height
|
|
t_method = info.method == desired_method
|
|
t_type = info.type == desired_type
|
|
|
|
if t_w and t_h and t_method and t_type:
|
|
file_info = FileInfo(
|
|
server_name=server_name,
|
|
file_id=file_id,
|
|
thumbnail=info,
|
|
)
|
|
|
|
responder = await self.media_storage.fetch_media(file_info)
|
|
if responder:
|
|
await respond_with_responder(
|
|
request, responder, info.type, info.length
|
|
)
|
|
return
|
|
|
|
logger.debug("We don't have a thumbnail of that size. Generating")
|
|
|
|
# Okay, so we generate one.
|
|
file_path = await self.media_repo.generate_remote_exact_thumbnail(
|
|
server_name,
|
|
file_id,
|
|
media_id,
|
|
desired_width,
|
|
desired_height,
|
|
desired_method,
|
|
desired_type,
|
|
)
|
|
|
|
if file_path:
|
|
await respond_with_file(request, desired_type, file_path)
|
|
else:
|
|
logger.warning("Failed to generate thumbnail")
|
|
raise SynapseError(400, "Failed to generate thumbnail.")
|
|
|
|
async def respond_remote_thumbnail(
|
|
self,
|
|
request: SynapseRequest,
|
|
server_name: str,
|
|
media_id: str,
|
|
width: int,
|
|
height: int,
|
|
method: str,
|
|
m_type: str,
|
|
max_timeout_ms: int,
|
|
) -> None:
|
|
# TODO: Don't download the whole remote file
|
|
# We should proxy the thumbnail from the remote server instead of
|
|
# downloading the remote file and generating our own thumbnails.
|
|
media_info = await self.media_repo.get_remote_media_info(
|
|
server_name, media_id, max_timeout_ms
|
|
)
|
|
if not media_info:
|
|
return
|
|
|
|
thumbnail_infos = await self.store.get_remote_media_thumbnails(
|
|
server_name, media_id
|
|
)
|
|
await self._select_and_respond_with_thumbnail(
|
|
request,
|
|
width,
|
|
height,
|
|
method,
|
|
m_type,
|
|
thumbnail_infos,
|
|
media_id,
|
|
media_info.filesystem_id,
|
|
url_cache=False,
|
|
server_name=server_name,
|
|
)
|
|
|
|
async def _select_and_respond_with_thumbnail(
|
|
self,
|
|
request: SynapseRequest,
|
|
desired_width: int,
|
|
desired_height: int,
|
|
desired_method: str,
|
|
desired_type: str,
|
|
thumbnail_infos: List[ThumbnailInfo],
|
|
media_id: str,
|
|
file_id: str,
|
|
url_cache: bool,
|
|
server_name: Optional[str] = None,
|
|
) -> None:
|
|
"""
|
|
Respond to a request with an appropriate thumbnail from the previously generated thumbnails.
|
|
|
|
Args:
|
|
request: The incoming request.
|
|
desired_width: The desired width, the returned thumbnail may be larger than this.
|
|
desired_height: The desired height, the returned thumbnail may be larger than this.
|
|
desired_method: The desired method used to generate the thumbnail.
|
|
desired_type: The desired content-type of the thumbnail.
|
|
thumbnail_infos: A list of thumbnail info of candidate thumbnails.
|
|
file_id: The ID of the media that a thumbnail is being requested for.
|
|
url_cache: True if this is from a URL cache.
|
|
server_name: The server name, if this is a remote thumbnail.
|
|
"""
|
|
logger.debug(
|
|
"_select_and_respond_with_thumbnail: media_id=%s desired=%sx%s (%s) thumbnail_infos=%s",
|
|
media_id,
|
|
desired_width,
|
|
desired_height,
|
|
desired_method,
|
|
thumbnail_infos,
|
|
)
|
|
|
|
# If `dynamic_thumbnails` is enabled, we expect Synapse to go down a
|
|
# different code path to handle it.
|
|
assert not self.dynamic_thumbnails
|
|
|
|
if thumbnail_infos:
|
|
file_info = self._select_thumbnail(
|
|
desired_width,
|
|
desired_height,
|
|
desired_method,
|
|
desired_type,
|
|
thumbnail_infos,
|
|
file_id,
|
|
url_cache,
|
|
server_name,
|
|
)
|
|
if not file_info:
|
|
logger.info("Couldn't find a thumbnail matching the desired inputs")
|
|
respond_404(request)
|
|
return
|
|
|
|
# The thumbnail property must exist.
|
|
assert file_info.thumbnail is not None
|
|
|
|
responder = await self.media_storage.fetch_media(file_info)
|
|
if responder:
|
|
await respond_with_responder(
|
|
request,
|
|
responder,
|
|
file_info.thumbnail.type,
|
|
file_info.thumbnail.length,
|
|
)
|
|
return
|
|
|
|
# If we can't find the thumbnail we regenerate it. This can happen
|
|
# if e.g. we've deleted the thumbnails but still have the original
|
|
# image somewhere.
|
|
#
|
|
# Since we have an entry for the thumbnail in the DB we a) know we
|
|
# have have successfully generated the thumbnail in the past (so we
|
|
# don't need to worry about repeatedly failing to generate
|
|
# thumbnails), and b) have already calculated that appropriate
|
|
# width/height/method so we can just call the "generate exact"
|
|
# methods.
|
|
|
|
# First let's check that we do actually have the original image
|
|
# still. This will throw a 404 if we don't.
|
|
# TODO: We should refetch the thumbnails for remote media.
|
|
await self.media_storage.ensure_media_is_in_local_cache(
|
|
FileInfo(server_name, file_id, url_cache=url_cache)
|
|
)
|
|
|
|
if server_name:
|
|
await self.media_repo.generate_remote_exact_thumbnail(
|
|
server_name,
|
|
file_id=file_id,
|
|
media_id=media_id,
|
|
t_width=file_info.thumbnail.width,
|
|
t_height=file_info.thumbnail.height,
|
|
t_method=file_info.thumbnail.method,
|
|
t_type=file_info.thumbnail.type,
|
|
)
|
|
else:
|
|
await self.media_repo.generate_local_exact_thumbnail(
|
|
media_id=media_id,
|
|
t_width=file_info.thumbnail.width,
|
|
t_height=file_info.thumbnail.height,
|
|
t_method=file_info.thumbnail.method,
|
|
t_type=file_info.thumbnail.type,
|
|
url_cache=url_cache,
|
|
)
|
|
|
|
responder = await self.media_storage.fetch_media(file_info)
|
|
await respond_with_responder(
|
|
request,
|
|
responder,
|
|
file_info.thumbnail.type,
|
|
file_info.thumbnail.length,
|
|
)
|
|
else:
|
|
# This might be because:
|
|
# 1. We can't create thumbnails for the given media (corrupted or
|
|
# unsupported file type), or
|
|
# 2. The thumbnailing process never ran or errored out initially
|
|
# when the media was first uploaded (these bugs should be
|
|
# reported and fixed).
|
|
# Note that we don't attempt to generate a thumbnail now because
|
|
# `dynamic_thumbnails` is disabled.
|
|
logger.info("Failed to find any generated thumbnails")
|
|
|
|
assert request.path is not None
|
|
respond_with_json(
|
|
request,
|
|
400,
|
|
cs_error(
|
|
"Cannot find any thumbnails for the requested media ('%s'). This might mean the media is not a supported_media_format=(%s) or that thumbnailing failed for some other reason. (Dynamic thumbnails are disabled on this server.)"
|
|
% (
|
|
request.path.decode(),
|
|
", ".join(THUMBNAIL_SUPPORTED_MEDIA_FORMAT_MAP.keys()),
|
|
),
|
|
code=Codes.UNKNOWN,
|
|
),
|
|
send_cors=True,
|
|
)
|
|
|
|
def _select_thumbnail(
|
|
self,
|
|
desired_width: int,
|
|
desired_height: int,
|
|
desired_method: str,
|
|
desired_type: str,
|
|
thumbnail_infos: List[ThumbnailInfo],
|
|
file_id: str,
|
|
url_cache: bool,
|
|
server_name: Optional[str],
|
|
) -> Optional[FileInfo]:
|
|
"""
|
|
Choose an appropriate thumbnail from the previously generated thumbnails.
|
|
|
|
Args:
|
|
desired_width: The desired width, the returned thumbnail may be larger than this.
|
|
desired_height: The desired height, the returned thumbnail may be larger than this.
|
|
desired_method: The desired method used to generate the thumbnail.
|
|
desired_type: The desired content-type of the thumbnail.
|
|
thumbnail_infos: A list of thumbnail infos of candidate thumbnails.
|
|
file_id: The ID of the media that a thumbnail is being requested for.
|
|
url_cache: True if this is from a URL cache.
|
|
server_name: The server name, if this is a remote thumbnail.
|
|
|
|
Returns:
|
|
The thumbnail which best matches the desired parameters.
|
|
"""
|
|
desired_method = desired_method.lower()
|
|
|
|
# The chosen thumbnail.
|
|
thumbnail_info = None
|
|
|
|
d_w = desired_width
|
|
d_h = desired_height
|
|
|
|
if desired_method == "crop":
|
|
# Thumbnails that match equal or larger sizes of desired width/height.
|
|
crop_info_list: List[
|
|
Tuple[int, int, int, bool, Optional[int], ThumbnailInfo]
|
|
] = []
|
|
# Other thumbnails.
|
|
crop_info_list2: List[
|
|
Tuple[int, int, int, bool, Optional[int], ThumbnailInfo]
|
|
] = []
|
|
for info in thumbnail_infos:
|
|
# Skip thumbnails generated with different methods.
|
|
if info.method != "crop":
|
|
continue
|
|
|
|
t_w = info.width
|
|
t_h = info.height
|
|
aspect_quality = abs(d_w * t_h - d_h * t_w)
|
|
min_quality = 0 if d_w <= t_w and d_h <= t_h else 1
|
|
size_quality = abs((d_w - t_w) * (d_h - t_h))
|
|
type_quality = desired_type != info.type
|
|
length_quality = info.length
|
|
if t_w >= d_w or t_h >= d_h:
|
|
crop_info_list.append(
|
|
(
|
|
aspect_quality,
|
|
min_quality,
|
|
size_quality,
|
|
type_quality,
|
|
length_quality,
|
|
info,
|
|
)
|
|
)
|
|
else:
|
|
crop_info_list2.append(
|
|
(
|
|
aspect_quality,
|
|
min_quality,
|
|
size_quality,
|
|
type_quality,
|
|
length_quality,
|
|
info,
|
|
)
|
|
)
|
|
# Pick the most appropriate thumbnail. Some values of `desired_width` and
|
|
# `desired_height` may result in a tie, in which case we avoid comparing on
|
|
# the thumbnail info and pick the thumbnail that appears earlier
|
|
# in the list of candidates.
|
|
if crop_info_list:
|
|
thumbnail_info = min(crop_info_list, key=lambda t: t[:-1])[-1]
|
|
elif crop_info_list2:
|
|
thumbnail_info = min(crop_info_list2, key=lambda t: t[:-1])[-1]
|
|
elif desired_method == "scale":
|
|
# Thumbnails that match equal or larger sizes of desired width/height.
|
|
info_list: List[Tuple[int, bool, int, ThumbnailInfo]] = []
|
|
# Other thumbnails.
|
|
info_list2: List[Tuple[int, bool, int, ThumbnailInfo]] = []
|
|
|
|
for info in thumbnail_infos:
|
|
# Skip thumbnails generated with different methods.
|
|
if info.method != "scale":
|
|
continue
|
|
|
|
t_w = info.width
|
|
t_h = info.height
|
|
size_quality = abs((d_w - t_w) * (d_h - t_h))
|
|
type_quality = desired_type != info.type
|
|
length_quality = info.length
|
|
if t_w >= d_w or t_h >= d_h:
|
|
info_list.append((size_quality, type_quality, length_quality, info))
|
|
else:
|
|
info_list2.append(
|
|
(size_quality, type_quality, length_quality, info)
|
|
)
|
|
# Pick the most appropriate thumbnail. Some values of `desired_width` and
|
|
# `desired_height` may result in a tie, in which case we avoid comparing on
|
|
# the thumbnail info and pick the thumbnail that appears earlier
|
|
# in the list of candidates.
|
|
if info_list:
|
|
thumbnail_info = min(info_list, key=lambda t: t[:-1])[-1]
|
|
elif info_list2:
|
|
thumbnail_info = min(info_list2, key=lambda t: t[:-1])[-1]
|
|
|
|
if thumbnail_info:
|
|
return FileInfo(
|
|
file_id=file_id,
|
|
url_cache=url_cache,
|
|
server_name=server_name,
|
|
thumbnail=thumbnail_info,
|
|
)
|
|
|
|
# No matching thumbnail was found.
|
|
return None
|