nginx.conf

# file: nginx.conf
# date: 2018-10-13
# license: GPLv3 https://www.gnu.org/licenses/gpl-3.0.txt
# author: nanpuyue <nanpuyue@gmail.com> https://blog.nanpuyue.com

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
	worker_connections 768;
}

rtmp {
    server{
        listen 1935;
        chunk_size 10240;

        application live {
            live on;
            record off;
            on_publish http://127.0.0.1:2080/auth;
            push rtmp://live.twitch.tv/app/xxxxxxxxxx;
            push rtmp://a.rtmp.youtube.com/xxxxxxxxxx;
        }
    }
}  

http {
    server {
        listen 127.0.0.1:2080;
        location /auth {
            rewrite_by_lua '
                ngx.req.read_body()
                local name = ngx.req.get_post_args().name
                if (name == "xxxxxxxxxx") then
                    ngx.status = 200
                    ngx.say("OK")
                    ngx.exit(200)
                else
                    ngx.status = 403
                    ngx.say("Forbidden")
                    ngx.exit(403)
                end
            ';
        }
    }
}

https://blog.nanpuyue.com/2018/047.html