#
# this is an example nginx config for zammad with free letsencrypt.org ssl certificates
# replace all occurrences of example.com with your domain
# when creating letsencrypt certificates the first time comment out the https parts in the config or nginx will not start
# create letsencrypt certificate by: /usr/bin/letsencrypt certonly --rsa-key-size 4096 --duplicate --text --webroot-path /var/www/html/ --webroot -d example.com -d www.example.com
# create dhparam.pem by: openssl dhparam -out /etc/nginx/ssl/dhparam.pem 4096
# download x3 certificate by: wget -q https://letsencrypt.org/certs/lets-encrypt-x3-cross-signed.pem -P /etc/nginx/ssl
# you can test your ssl configuration @ https://www.ssllabs.com/ssltest/analyze.html
#

upstream zammad {
    server localhost:3000;
}

upstream zammad-websocket {
    server localhost:6042;
}

server {
    listen 80;
    listen [::]:80;

    server_name example.com www.example.com;

    access_log /var/log/nginx/example.com.access.log;
    error_log  /var/log/nginx/example.com.error.log;

    location /.well-known/ {
	root /var/www/html;
    }

    location / {
	rewrite ^/(.*)$ https://www.example.com/$1 permanent;
    }
}


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

    server_name example.com;

    ssl_certificate /etc/nginx/ssl/example.com-fullchain.pem;
    ssl_certificate_key /etc/nginx/ssl/example.com-privkey.pem;

    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

    ssl_ciphers HIGH:!aNULL:!MD5;

    ssl_dhparam /etc/nginx/ssl/dhparam.pem;

    ssl_prefer_server_ciphers on;

    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 180m;

    ssl_stapling on;
    ssl_stapling_verify on;

    ssl_trusted_certificate /etc/nginx/ssl/lets-encrypt-x3-cross-signed.pem;

    resolver 8.8.8.8 8.8.4.4;

    add_header Strict-Transport-Security "max-age=31536000" always;

    access_log /var/log/nginx/example.com.access.log;
    error_log  /var/log/nginx/example.com.error.log;

    rewrite ^/(.*)$ https://www.example.com/$1 permanent;
}

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

    server_name www.example.com;

    ssl_certificate /etc/nginx/ssl/example.com-fullchain.pem;
    ssl_certificate_key /etc/nginx/ssl/example.com-privkey.pem;

    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

    ssl_ciphers HIGH:!aNULL:!MD5;

    ssl_dhparam /etc/nginx/ssl/dhparam.pem;

    ssl_prefer_server_ciphers on;

    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 180m;

    ssl_stapling on;
    ssl_stapling_verify on;

    ssl_trusted_certificate /etc/nginx/ssl/lets-encrypt-x3-cross-signed.pem;

    resolver 8.8.8.8 8.8.4.4;

    add_header Strict-Transport-Security "max-age=31536000" always;

    location = /robots.txt  {
	access_log off; log_not_found off;
    }

    location = /favicon.ico {
	access_log off; log_not_found off;
    }

    root /opt/zammad/public;

    access_log /var/log/nginx/example.com.access.log;
    error_log  /var/log/nginx/example.com.error.log;

    client_max_body_size 50M;

    location ~ ^/(assets/|robots.txt|humans.txt|favicon.ico) {
        expires max;
    }

    location /ws {
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_set_header CLIENT_IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_read_timeout 86400;
        proxy_pass http://zammad-websocket;
    }

    location / {
        proxy_set_header Host $http_host;
        proxy_set_header CLIENT_IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_read_timeout 300;
        proxy_pass http://zammad;

        gzip on;
        gzip_types text/plain text/xml text/css image/svg+xml application/javascript application/x-javascript application/json application/xml;
        gzip_proxied any;
    }

}