Fix get_input_media for InputFile

It was actually using FileLocation, which had the invalid expected
type for what was being returned. Instead it should have been this
other type.

In addition, more parameters are passed so that the method can have
all the information it needs to correctly cast the type.

telethon/utils.py

@@ -355,12 +355,17 @@ def get_input_geo(geo):
     _raise_cast_fail(geo, 'InputGeoPoint')
 
 
-def get_input_media(media, is_photo=False):
+def get_input_media(
+        media, *,
+        is_photo=False, attributes=None, force_document=False,
+        voice_note=False, video_note=False, supports_streaming=False
+):
     """
     Similar to :meth:`get_input_peer`, but for media.
 
-    If the media is a file location and ``is_photo`` is known to be ``True``,
-    it will be treated as an :tl:`InputMediaUploadedPhoto`.
+    If the media is :tl:`InputFile` and ``is_photo`` is known to be ``True``,
+    it will be treated as an :tl:`InputMediaUploadedPhoto`. Else, the rest
+    of parameters will indicate how to treat it.
     """
     try:
         if media.SUBCLASS_OF_ID == 0xfaf846f4:  # crc32(b'InputMedia')
@@ -394,15 +399,20 @@ def get_input_media(media, is_photo=False):
             id=get_input_document(media)
         )
 
-    if isinstance(media, types.FileLocation):
+    if isinstance(media, (types.InputFile, types.InputFileBig)):
         if is_photo:
             return types.InputMediaUploadedPhoto(file=media)
         else:
-            return types.InputMediaUploadedDocument(
-                file=media,
-                mime_type='application/octet-stream',  # unknown, assume bytes
-                attributes=[types.DocumentAttributeFilename('unnamed')]
+            attrs, mime = get_attributes(
+                media,
+                attributes=attributes,
+                force_document=force_document,
+                voice_note=voice_note,
+                video_note=video_note,
+                supports_streaming=supports_streaming
             )
+            return types.InputMediaUploadedDocument(
+                file=media, mime_type=mime, attributes=attrs)
 
     if isinstance(media, types.MessageMediaGame):
         return types.InputMediaGame(id=media.game.id)
@@ -487,6 +497,7 @@ def get_attributes(file, *, attributes=None, mime_type=None,
     Get a list of attributes for the given file and
     the mime type as a tuple ([attribute], mime_type).
     """
+    # Note: ``file.name`` works for :tl:`InputFile` and some `IOBase` streams
     name = file if isinstance(file, str) else getattr(file, 'name', 'unnamed')
     if mime_type is None:
         mime_type = mimetypes.guess_type(name)[0]
@@ -641,6 +652,7 @@ def _get_extension(file):
         kind = imghdr.what(file) is not None
         return ('.' + kind) if kind else ''
     elif getattr(file, 'name', None):
+        # Note: ``file.name`` works for :tl:`InputFile` and some `IOBase`
         return _get_extension(file.name)
     else:
         return ''