map $http_upgrade $connection_upgrade {
  default upgrade;
  ''      close;
}

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

  server_name $NGINX_HOST;
  root /var/www/html;

  location /.well-known/acme-challenge/ {
      allow all;
  }

  location / {
      return 301 https://$host$request_uri;
  }
}

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

  server_name $NGINX_HOST;
  server_tokens off;

  ssl_protocols TLSv1.2;
  ssl_ciphers ECDHE+CHACHA20:AES256+EECDH:AES256+EDH:!aNULL;
  ssl_ecdh_curve secp384r1;
  ssl_prefer_server_ciphers on;
  ssl_session_cache shared:TLS:2m;
  ssl_session_timeout 10m;
  ssl_session_tickets off;
  ssl_stapling on;
  ssl_stapling_verify on;

  keepalive_timeout 70;
  sendfile on;
  client_max_body_size 0;

  add_header X-Frame-Options DENY;
  add_header X-Content-Type-Options nosniff;
  add_header X-XSS-Protection "1; mode=block";
  add_header Referrer-Policy "same-origin";
  add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload";

  ssl_certificate /etc/ssl/fullchain.pem;
  ssl_certificate_key /etc/ssl/privkey.pem;
  ssl_trusted_certificate /etc/ssl/cert.pem;

  resolver 1.1.1.1 1.0.0.1 [2606:4700:4700::1111] [2606:4700:4700::1001] valid=300s;
  resolver_timeout 5s;

  root /var/www/html;

  add_header Access-Control-Allow-Origin "https://$host";
  add_header X-Cache-Status $upstream_cache_status;

  location / {
    try_files $uri @proxy;
  }

  location /sw.js {
    add_header Cache-Control "public, max-age=0";
    try_files $uri @proxy;
  }

  location ~ ^/(emoji|packs|sounds|system/media_attachments/files) {
    add_header Cache-Control "public, max-age=31536000, immutable";

    gzip on;
    gzip_disable "msie6";
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_buffers 16 8k;
    gzip_http_version 1.1;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

    try_files $uri @proxy;
  }

  location @proxy {
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto https;
    proxy_set_header Proxy "";
    proxy_pass_header Server;

    proxy_pass http://mstweb:3000;
    proxy_buffering on;
    proxy_redirect off;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;

    proxy_cache CACHE;
    proxy_cache_valid 200 7d;
    proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
    proxy_cache_lock on;
    proxy_cache_revalidate on;

    tcp_nodelay on;
  }

  location /api/v1/streaming {
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto https;
    proxy_set_header Proxy "";

    proxy_pass http://mstweb:4000;
    proxy_buffering off;
    proxy_redirect off;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;

    tcp_nodelay on;
  }

  error_page 403 /assets/403.html;
  error_page 404 /assets/404.html;
  error_page 410 /assets/410.html;
  error_page 422 /assets/422.html;
  error_page 500 501 502 503 504 /assets/500.html;
}

proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=CACHE:10m inactive=7d max_size=2g use_temp_path=off;