# How to install Epicyon

You will need python version 3.7 or later.

On a Debian based system:

    sudo apt install -y tor python3-socks imagemagick python3-numpy python3-setuptools python3-crypto python3-cryptodome python3-dateutil python3-pil.imagetk python3-idna python3-requests python3-flake8 libimage-exiftool-perl certbot nginx

The following instructions install Epicyon to the /opt directory. It's not essential that it be installed there, and it could be in any other preferred directory.

Clone the repo, or if you downloaded the tarball then extract it into the /opt directory.

    cd /opt
    git clone https://gitlab.com/bashrc2/epicyon

Create a user for the server to run as:

    sudo su
    adduser --system --home=/opt/epicyon --group epicyon
    chown -R epicyon:epicyon /opt/epicyon

Create a daemon:

    nano /etc/systemd/system/epicyon.service

Paste the following:

    [Unit]
    Description=epicyon
    After=syslog.target
    After=network.target

    [Service]
    Type=simple
    User=epicyon
    Group=epicyon
    WorkingDirectory=/opt/epicyon
    ExecStart=/usr/bin/python3 /opt/epicyon/epicyon.py --port 443 --proxy 7156 --domain YOUR_DOMAIN --registration open --debug
    Environment=USER=epicyon
    Environment=PYTHONUNBUFFERED=true
    Restart=always
    StandardError=syslog
    CPUQuota=80%

    [Install]
    WantedBy=multi-user.target

Activate the daemon:

    systemctl enable epicyon
    systemctl start epicyon

Create a web server configuration:

    nano /etc/nginx/sites-available/YOUR_DOMAIN

And paste the following:

    proxy_cache_path /var/www/cache levels=1:2 keys_zone=my_cache:10m max_size=10g
                     inactive=60m use_temp_path=off;
    server {
        listen 80;
        listen [::]:80;
        server_name YOUR_DOMAIN;
        access_log /dev/null;
        error_log /dev/null;
        client_max_body_size 31m;
        client_body_buffer_size 128k;

        limit_conn conn_limit_per_ip 10;
        limit_req zone=req_limit_per_ip burst=10 nodelay;

        index index.html;
        rewrite ^ https://$server_name$request_uri? permanent;
    }

    server {
        listen 443 ssl;
        server_name YOUR_DOMAIN;

        ssl_stapling off;
        ssl_stapling_verify off;
        ssl on;
        ssl_certificate /etc/letsencrypt/live/YOUR_DOMAIN/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/YOUR_DOMAIN/privkey.pem;
        #ssl_dhparam /etc/ssl/certs/YOUR_DOMAIN.dhparam;

        ssl_session_cache builtin:1000 shared:SSL:10m;
        ssl_session_timeout 60m;
        ssl_prefer_server_ciphers on;
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS';
        add_header X-Frame-Options DENY;
        add_header X-Content-Type-Options nosniff;
        add_header X-XSS-Protection "1; mode=block";
        add_header X-Download-Options noopen;
        add_header X-Permitted-Cross-Domain-Policies none;

        add_header X-Robots-Tag "noindex, nofollow, nosnippet, noarchive";
        add_header Strict-Transport-Security max-age=15768000;

        access_log /dev/null;
        error_log /dev/null;

        index index.html;

        location / {
            proxy_http_version 1.1;
            client_max_body_size 31M;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_set_header Host $http_host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forward-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forward-Proto http;
            proxy_set_header X-Nginx-Proxy true;
     	    expires epoch;
            proxy_no_cache 1;
            proxy_temp_file_write_size 64k;
            proxy_connect_timeout 10080s;
            proxy_send_timeout 10080;
            proxy_read_timeout 10080;
            proxy_buffer_size 64k;
            proxy_buffers 16 32k;
            proxy_busy_buffers_size 64k;
            proxy_redirect off;
            proxy_request_buffering on;
            proxy_buffering on;
	    proxy_cache my_cache;
	    proxy_cache_use_stale error timeout http_500 http_502 http_503 http_504;
	    location ~ ^/(icons|images|media|emoji)/(.*)/(.*).(png|jpg|gif|webp|mp3|ogv|ogg|mp4) {
	    	expires 7d;
                proxy_pass http://localhost:7156;
            }
            location ~ ^/icons/(.*)/(like|repeat|calendar)(.*).(png|jpg|gif|webp|mp3|ogv|ogg|mp4) {
                expires epoch;
                proxy_no_cache 1;
                proxy_pass http://localhost:7156;
            }
            location ~ ^/icons/(like|repeat|calendar)(.*).(png|jpg|gif|webp|mp3|ogv|ogg|mp4) {
                expires epoch;
                proxy_no_cache 1;
                proxy_pass http://localhost:7156;
            }
            location ~ ^/users/(.*)/(image|banner).png {
                expires epoch;
                proxy_no_cache 1;
                proxy_pass http://localhost:7156;
            }
            proxy_pass http://localhost:7156;
        }
    }

Enable the site:

    ln -s /etc/nginx/sites-available/YOUR_DOMAIN /etc/nginx/sites-enabled/
    mkdir /var/www/cache

Forward port 443 from your internet router to your server. If you have dynamic DNS make sure its configured. Add a TLS certificate:

    certbot certonly -n --server https://acme-v01.api.letsencrypt.org/directory --standalone -d YOUR_DOMAIN --renew-by-default --agree-tos --email YOUR_EMAIL

Restart your web server:

    systemctl restart nginx

If you are using the Caddy web server then see caddy.example.conf

Now you can navigate to your domain and register an account. The first account becomes the administrator.