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Sort thumbs to ensure -1 is largest

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Closes #1519.
This commit is contained in:
Lonami Exo 2020-08-11 23:14:31 +02:00
parent 0cefc73448
commit e19aa44d5c
1 changed files with 26 additions and 1 deletions
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27
telethon/client/downloads.py
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@ -310,13 +310,20 @@ class DownloadMethods:
The parameter should be an integer index between ``0`` and
``len(sizes)``. ``0`` will download the smallest thumbnail,
and ``len(sizes) - 1`` will download the largest thumbnail.
You can also use negative indices.
You can also use negative indices, which work the same as
they do in Python's `list`.
You can also pass the :tl:`PhotoSize` instance to use.
Alternatively, the thumb size type `str` may be used.
In short, use ``thumb=0`` if you want the smallest thumbnail
and ``thumb=-1`` if you want the largest thumbnail.
.. note::
The largest thumbnail may be a video instead of a photo,
as they are available since layer 116 and are bigger than
any of the photos.
Returns
`None` if no media was provided, or if it was Empty. On success
the file path is returned since it may differ from the one given.
@ -630,6 +637,24 @@ class DownloadMethods:
@staticmethod
def _get_thumb(thumbs, thumb):
# Seems Telegram has changed the order and put `PhotoStrippedSize`
# last while this is the smallest (layer 116). Ensure we have the
# sizes sorted correctly with a custom function.
def sort_thumbs(thumb):
if isinstance(thumb, types.PhotoStrippedSize):
return 1, len(thumb.bytes)
if isinstance(thumb, types.PhotoCachedSize):
return 1, len(thumb.bytes)
if isinstance(thumb, types.PhotoSize):
return 1, thumb.size
if isinstance(thumb, types.VideoSize):
return 2, thumb.size
# Empty size or invalid should go last
return 0, 0
thumbs = list(sorted(thumbs, key=sort_thumbs))
if thumb is None:
return thumbs[-1]
elif isinstance(thumb, int):