upstream _btcpayserver {
  server localhost:<%= @btcpay_port %>;
}

# If we receive X-Forwarded-Proto, pass it through; otherwise, pass along the
# scheme used to connect to this server
map $http_x_forwarded_proto $proxy_x_forwarded_proto {
  default $http_x_forwarded_proto;
  ''      $scheme;
}

# If we receive X-Forwarded-Port, pass it through; otherwise, pass along the
# server port the client connected to
map $http_x_forwarded_port $proxy_x_forwarded_port {
  default $http_x_forwarded_port;
  ''      $server_port;
}

# If we receive Upgrade, set Connection to "upgrade"; otherwise, delete any
# Connection header that may have been passed to this server
map $http_upgrade $proxy_connection {
  default upgrade;
  '' close;
}

# Set appropriate X-Forwarded-Ssl header
map $scheme $proxy_x_forwarded_ssl {
  default off;
  https on;
}

# HTTP 1.1 support
proxy_http_version 1.1;
proxy_buffering off;
proxy_set_header Host $http_host;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $proxy_connection;
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 $proxy_x_forwarded_proto;
proxy_set_header X-Forwarded-Ssl $proxy_x_forwarded_ssl;
proxy_set_header X-Forwarded-Port $proxy_x_forwarded_port;

# Mitigate httpoxy attack
proxy_set_header Proxy "";

server {
  client_max_body_size 100M;
  server_name <%= @server_name %>;
  <% if File.exist?(@ssl_cert) && File.exist?(@ssl_key) -%>
  listen 443 ssl http2;
  <% else -%>
  listen 80;
  <% end -%>

  access_log <%= node[:nginx][:log_dir] %>/btcpayserver.access.log json;
  error_log <%= node[:nginx][:log_dir] %>/btcpayserver.error.log warn;

  ssl_prefer_server_ciphers on;
  ssl_session_timeout 5m;
  ssl_session_cache shared:SSL:50m;
  ssl_session_tickets off;

  <% if File.exist?(@ssl_cert) && File.exist?(@ssl_key) -%>
  ssl_certificate <%= @ssl_cert %>;
  ssl_certificate_key <%= @ssl_key %>;

  add_header Strict-Transport-Security "max-age=15768000";
  <% end -%>

  location / {
    proxy_pass http://_btcpayserver;
  }
}
