user                 www-data www-data;
error_log            /var/log/nginx/error.log;
pid                  /var/run/nginx.pid;
worker_processes     auto;
worker_rlimit_nofile 8192;

events {
  worker_connections  1024;
}

http {
  limit_req_zone $binary_remote_addr zone=ratelimit:10m rate=20r/s;
  proxy_set_header Host $host;
  charset utf-8;
  sendfile on;
  tcp_nopush on;
  tcp_nodelay on;
  server_tokens off;
  types_hash_max_size 2048;

  # buffering
  client_header_buffer_size 1k;
  client_max_body_size 20M;
  ignore_invalid_headers off;
  proxy_buffering off;

  log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';

  map $http_upgrade $connection_upgrade {
    default     "upgrade";
  }

  server {
    listen       80 default_server;
    listen  [::]:80 default_server;
    server_name  _;
    client_max_body_size 1000m;
    ignore_invalid_headers off;
    proxy_buffering off;
    # port_in_redirect off;

    location ^~ /.well-known/acme-challenge/ {
        default_type "text/plain";
        root         /var/www/html;
        break;
    }
    location = /.well-known/acme-challenge/ {
        return 404;
    }

    location /app {
      proxy_pass      http://127.0.0.1:4001;
    }

    location = / {
      proxy_pass      http://127.0.0.1:4001;
    }

    location ~ ^/(builder|app_) {
      proxy_http_version  1.1;
      proxy_set_header    Connection          $connection_upgrade;
      proxy_set_header    Upgrade             $http_upgrade;
      proxy_set_header    X-Real-IP           $remote_addr;
      proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;
      proxy_pass      http://127.0.0.1:4001;
    }

    location ~ ^/api/(system|admin|global)/ {
      proxy_pass      http://127.0.0.1:4002;
    }

    location /worker/ {
      proxy_pass      http://127.0.0.1:4002;
      rewrite ^/worker/(.*)$ /$1 break;
    }

    location /api/ {
      # calls to the API are rate limited with bursting
      limit_req zone=ratelimit burst=20 nodelay;

      # 120s timeout on API requests
      proxy_read_timeout 120s;
      proxy_connect_timeout 120s;
      proxy_send_timeout 120s;

      proxy_http_version  1.1;
      proxy_set_header    Connection          $connection_upgrade;
      proxy_set_header    Upgrade             $http_upgrade;
      proxy_set_header    X-Real-IP           $remote_addr;
      proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;

      proxy_pass      http://127.0.0.1:4001;
    }

    location /db/ {
      proxy_pass      http://127.0.0.1:5984;
      rewrite ^/db/(.*)$ /$1 break;
    }

    location / {
      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_connect_timeout 300;
      proxy_http_version 1.1;
      proxy_set_header Connection "";
      chunked_transfer_encoding off;
      proxy_pass      http://127.0.0.1:9000;
    }

    client_header_timeout 60;
    client_body_timeout   60;
    keepalive_timeout     60;

    # gzip
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types text/plain text/css text/xml application/json application/javascript application/rss+xml application/atom+xml image/svg+xml;
  }
}