Implement SOCKS v4, v5 Proxy

[sethmlarson]

Related: #36

[sethmlarson]

So the issue with this is that there's no sans-I/O implementation of the SOCKv4 and SOCKSv5 protocols that doesn't require us to add 3 dependencies. The protocols are so simple that I'm actually in favor of writing our own library that has no dependencies.

[yeraydiazdiaz]

I'm happy to lend a hand on this @sethmlarson. Does it depend on #259?

[sethmlarson]

Thanks @yeraydiazdiaz! ❤️

It'll definitely intersect on the configuration stage on the client but the dispatcher implementation is separate, let's start by getting a sans-I/O implementation of SOCKSv4 and v5 w/o dependencies and go from there.

I actually think that the sans-I/O implementation should be it's own library, maybe on the python-http org, but it can start on one of our personal accounts. Would you like to be the originator or should I create a repo and add you and you can take it from there?

[yeraydiazdiaz]

I'll definitely need some help so it might be easier if it's all setup in non-personal repo from the start 🙂

[sethmlarson]

I pushed the initial commit: https://github.com/sethmlarson/socks
Feel free to make massive changes as nothing currently works E2E, it's just a result of me programming a few hours.
I've sent collaborator requests to everyone interested. :)

The repo will live under python-http once we release for the first time!

[mIcHyAmRaNe]

while waiting for the implementation, this is a temporary alternative for people who want to use socks4/5 with httpx by using pysocks :

# pip install PySocks

import httpx
import socks
import socket

socks.set_default_proxy(socks.SOCKS5, "127.0.0.1", 9050)
socket.socket = socks.socksocket

URL = 'http://ifconfig.me/ip'

with httpx.Client() as client:
    resp = client.get(URL)
    print(resp.text)

[romis2012]

If it's relevant, there is 3rd party SOCKS implementation: httpx-socks

[bbkane]

It looks like that one doesnt support trio (my favorite async backend).

[romis2012]

It looks like that one doesnt support trio (my favorite async backend).

Trio support added in version 0.2.0