Add utils.get_input_location

telethon/telegram_client.py

@@ -2235,6 +2235,7 @@ class TelegramClient(TelegramBareClient):
         # The used client will change if FileMigrateError occurs
         client = self
         cdn_decrypter = None
+        input_location = utils.get_input_location(input_location)
 
         __log__.info('Downloading file in chunks of %d bytes', part_size)
         try:

telethon/utils.py

@@ -25,7 +25,8 @@ from .tl.types import (
     InputPhotoEmpty, FileLocation, ChatPhotoEmpty, UserProfilePhotoEmpty,
     FileLocationUnavailable, InputMediaUploadedDocument, ChannelFull,
     InputMediaUploadedPhoto, DocumentAttributeFilename, photos,
-    TopPeer, InputNotifyPeer, InputMessageID
+    TopPeer, InputNotifyPeer, InputMessageID, InputFileLocation,
+    InputDocumentFileLocation, PhotoSizeEmpty
 )
 from .tl.types.contacts import ResolvedPeer
 
@@ -352,6 +353,39 @@ def get_input_message(message):
     _raise_cast_fail(message, 'InputMedia')
 
 
+def get_input_location(location):
+    """Similar to :meth:`get_input_peer`, but for input messages."""
+    try:
+        if location.SUBCLASS_OF_ID == 0x1523d462:
+            return location  # crc32(b'InputFileLocation'):
+    except AttributeError:
+        _raise_cast_fail(location, 'InputFileLocation')
+
+    if isinstance(location, Message):
+        location = location.media
+
+    if isinstance(location, MessageMediaDocument):
+        location = location.document
+    elif isinstance(location, MessageMediaPhoto):
+        location = location.photo
+
+    if isinstance(location, Document):
+        return InputDocumentFileLocation(
+            location.id, location.access_hash, location.version)
+    elif isinstance(location, Photo):
+        try:
+            location = next(x for x in reversed(location.sizes)
+                            if not isinstance(x, PhotoSizeEmpty)).location
+        except StopIteration:
+            pass
+
+    if isinstance(location, (FileLocation, FileLocationUnavailable)):
+        return InputFileLocation(
+            location.volume_id, location.local_id, location.secret)
+
+    _raise_cast_fail(location, 'InputFileLocation')
+
+
 def is_image(file):
     """
     Returns ``True`` if the file extension looks like an image file to Telegram.