Tor / proxy support with authentication

[Mikaela]

Is your feature request related to a problem? Please describe.

Currently Elements don't support using a proxy or Tor outside of Element Web flag without authentication.

Describe the solution you'd like

I would like Elements to support configuring a proxy (or in case of Element Android supporting connecting to OrBot directly) without obscure command line flags that don't support proxy authentication.

Additional context

I wrote this section in a text editor before seeing the issue template

I think Element should support avoiding censorship by proxies, especially Tor which by default uses socks5, TCP port 9050 or with Tor Browser 9150.

• Riot-meta: Proxy support riot-meta#287
• Android: Support for Socks/Http Proxy? element-android#488
• iOS: TOR needs to be integrated in IOS version because TOR is BROKEN with IOS element-ios#1085
• Web: add UI for setting HTTP proxy to desktop app element-desktop#772 (supported by --proxy-server=socks5://127.0.0.1:9050 which isn't particularly user friendly and no support for authentication)

Currently proxy authentication is not supported even by Element Web, but I consider that an important feature due to Tor's option IsolateSOCKSAuth which allows having different circuits for when different username/password combination is given.

IsolateSOCKSAuth
Don’t share circuits with streams for which different SOCKS authentication was provided. (For HTTPTunnelPort connections, this option looks at the Proxy-Authorization and
X-Tor-Stream-Isolation headers. On by default; you can disable it with NoIsolateSOCKSAuth.)

• https://2019.www.torproject.org/docs/tor-manual.html.en

[spignelon]

Any updates on this?
Many of us are unable to use the app in India due to the recent ban. The ISPs are throttling connection, rendering the app unusable without a VPN, it would be much easier if element apps had an inbuilt proxy option like Signal and Telegram.

https://element.io/blog/india-bans-flagship-client-for-the-matrix-network/