upstream ${UPSTREAM_NAME} {
     server mastodon-web.${UPSTREAM_CNS_BASE_DOMAIN}:${UPSTREAM_PORT};
}

upstream streaming {
    server mastodon-streaming.${UPSTREAM_CNS_BASE_DOMAIN}:4000 fail_timeout=0;
}

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

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

# generated 2021-02-28, Mozilla Guideline v5.6, nginx 1.19, OpenSSL 1.1.1d, modern configuration
# https://ssl-config.mozilla.org/#server=nginx&version=1.19&config=modern&openssl=1.1.1d&guideline=5.6
server {
    listen 80 default_server;

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

server {
    listen 443 ssl http2;

    ssl_certificate /data/dehydrated/certs/${LETSENCRYPT_DOMAIN}/fullchain.pem;
    ssl_certificate_key /data/dehydrated/certs/${LETSENCRYPT_DOMAIN}/privkey.pem;
    ssl_session_timeout 1d;
    ssl_session_cache shared:MozSSL:10m;  # about 40000 sessions
    ssl_session_tickets off;

    # modern configuration
    ssl_protocols TLSv1.3;
    ssl_prefer_server_ciphers off;

    # HSTS (ngx_http_headers_module is required) (63072000 seconds)
    add_header Strict-Transport-Security "max-age=63072000" always;

    # OCSP stapling
    ssl_stapling on;
    ssl_stapling_verify on;

    # verify chain of trust of OCSP response using Root CA and Intermediate certs
    ssl_trusted_certificate /data/dehydrated/certs/${LETSENCRYPT_DOMAIN}/fullchain.pem;

    # replace with the IP address of your resolver
    resolver 85.88.23.13 85.88.23.14 85.88.1.92;

    keepalive_timeout    70;
    sendfile             on;
    client_max_body_size 80m;

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

    location / {
      try_files $uri @proxy;
    }

     location ~ ^/(emoji|packs|system/accounts/avatars|system/media_attachments/files) {
      add_header Cache-Control "public, max-age=31536000, immutable";
      add_header Strict-Transport-Security "max-age=31536000";
      try_files $uri @proxy;
    }

    location /sw.js {
      add_header Cache-Control "public, max-age=0";
      add_header Strict-Transport-Security "max-age=31536000";
      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 $scheme;
      proxy_set_header Proxy "";
      proxy_pass_header Server;

      proxy_pass http://${UPSTREAM_NAME};
      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_valid 410 24h;
      proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
      add_header X-Cached $upstream_cache_status;
      add_header Strict-Transport-Security "max-age=31536000";

      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 $scheme;
      proxy_set_header Proxy "";

      proxy_pass http://streaming;
      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 500 501 502 503 504 /500.html;
}