Add torrent-client whitelisting

[Ianleeclark]

A lot of private trackers tend to whitelist or blacklist specific clients (transmission 2.90 as of right now) so this is a much needed feature.

[anacrolix]

Do you know why this is done?

[Ianleeclark]

Trackers will typically enable Whitelisting because they feel a peer using
a specific client isn't safe. The safety can be toward the peer (for
example, disallowing a torrent client that has known malware) or toward the
torrenting community/tracker (for example disallowing the newer versions of
utorrent). These are the two most common reasons a tracker would white list
clients or blacklist clients
On Apr 8, 2016 04:28, "Matt Joiner" notifications@github.com wrote:

Do you know why this is done?

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#40 (comment)

[anacrolix]

This was a deep rabbit hole that lead to reading about uTorrent going bad, and Xunlei and other bad clients. Thanks.

If you begin a whitelist or blacklist, the values for github.com/anacrolix/torrent are to be found here: https://github.com/anacrolix/torrent/blob/master/global.go#L14 (recommend whitelist obviously).

[Ianleeclark]

Haha, I feel the same way about writing this entire tracker. Plus one you
ever dive into http specifications your always bound to learn something.

Thanks for the recommendation, anacrolix wrote a really solid library so
I'll definitely check out the Whitelisting section.
On Apr 14, 2016 02:20, "Matt Joiner" notifications@github.com wrote:

This was a deep rabbit hole that lead to reading about uTorrent going bad,
and Xunlei and other bad clients. Thanks.

If you begin a whitelist or blacklist, the values for
github.com/anacrolix/torrent are to be found here:
https://github.com/anacrolix/torrent/blob/master/global.go#L14 (recommend
whitelist obviously).

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#40 (comment)

[Ianleeclark]

Hah. I didn't realise you were anacrolix until just now.