Install server

Install requirements

sudo apt install nginx wget openssl

nginx config file

You have to create an SSL/TLS certificate (and change the path in the config)

server {
        listen 443 ssl http2;
        listen [::]:443 ssl http2;

        server_name SUB.DOMAIN.TLD;

        root /var/www/etopa;
        index index.html;

        ssl_certificate /etc/letsencrypt/live/SUB.DOMAIN.TLD/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/SUB.DOMAIN.TLD/privkey.pem;

        add_header Cache-Control no-cache;
        expires -1;

        location = / {
                try_files $uri $uri/ =404;
        }

        location = /app/ {
                try_files $uri $uri/ =404;
        }

        location ~* \.(js|css|html|woff2|wasm|png|ico|svg|json|txt)$ {
                try_files $uri $uri/ =404;
        }

        location / {
                proxy_set_header Host $host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_pass https://[::1]:4490;
        }
}

systemd file

sudo nano /usr/lib/systemd/system/etopa.service

[Unit]
Description=Etopa HTTPS API
After=network.target

[Service]
Type=simple
User=etopa
Group=etopa
WorkingDirectory=/var/lib/etopa
ExecStart=/usr/bin/etopa
KillMode=process
CapabilityBoundingSet=CAP_NET_BIND_SERVICE
AmbientCapabilities=CAP_NET_BIND_SERVICE

[Install]
WantedBy=multi-user.target

Configuration file

sudo nano /etc/etopa.conf

port = 4490
addr = [::]
threads = 2
vlt = 604800
data = data
cert = data/cert.pem
key = data/key.pem

Create user

sudo useradd -M -s /bin/false etopa

Create directories

sudo mkdir -p /var/lib/etopa/data /var/www/etopa

Etopa SSL/TLS certificate

sudo openssl req -x509 -newkey rsa:2048 -keyout /var/lib/etopa/data/key.pem -out /var/lib/etopa/data/cert.pem -days 3650 -nodes -subj '/CN=localhost'

Set file permissions

sudo chown -R etopa:etopa /var/lib/etopa

Download etopa binary

sudo wget -O /usr/bin/etopa https://github.com/ltheinrich/etopa/releases/latest/download/etopa && sudo chmod +x /usr/bin/etopa

Download and extract etopa web files

sudo wget -O /tmp/etopa.tar.xz https://github.com/ltheinrich/etopa/releases/latest/download/etopa.tar.xz

sudo tar xfJ /tmp/etopa.tar.xz -C /var/www/etopa

Edit web config (change API_URL)

sudo nano /var/www/etopa/config.js

Enable and start

sudo systemctl enable etopa.service && sudo systemctl start etopa.service && sudo systemctl restart nginx