ValueError: invalid literal for int() with base 10: b'i1e' in TorrentDef.is_private()

[kozlovsky]

Sometimes TorrentDef.is_private() method crashes with the following error:

ValueError: invalid literal for int() with base 10: b'i1e' 

The private field of the info dict in the torrent metadata description should be of int type. Sometimes it has a bytes value b'i1e'. That value corresponds to the bencoded int value 1. It seems that some torrents files have their metadata incorrectly encoded, with the private field encoded twice: first, it is bencoded 1 -> b'i1e', and then it is bencoded again during the usual process of encoding the entire meta info dict.

To avoid the crash, an additional check should be added to the code that reads the attribute value.

The value b'i1e' means that the intention of the torrent's author was to set private=1 for the torrent. But as the value is technically incorrect, we can fall back to the default property value private=0 when interpreting this incorrect value.

[sentry-for-tribler]

Sentry issue: TRIBLER-112