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

server {
  listen 80;

  include autossl.conf;

  set_real_ip_from 192.168.1.0/24;
  real_ip_header X-Real-IP;
  real_ip_recursive on;

  # Per-host SSO endpoints (#57), served on EVERY proxied host by the nodejs app.
  # This location deliberately sits OUTSIDE the auth gate in `location /` (so the
  # login flow itself is never gated) and forwards to the app, which runs the
  # OIDC flow and sets the __proxy_sso session cookie for this host.
  location /__proxy_auth/ {
	proxy_pass http://proxy_auth_backend;
	proxy_http_version 1.1;
	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;
  }

  location / {

	set $target '';
	set $target_scheme 'http';
	set $target_port '';
	set $header_host $host;
	set $skip_cache 1;

	access_by_lua_block {
		local targetInfo = require "targetinfo"
		local hostfeatures = require "hostfeatures"
		local host = ngx.var.host
		local uri = ngx.var.uri
		local scheme = ngx.var.scheme
		local res, errCode = targetInfo.get(ngx, host, ngx.ctx.targetInfo)
		if not res then
			return ngx.exit(errCode or 500)
		end

		if scheme == "http" then
			if res["forcessl"] == "true" then
				return ngx.redirect("https://"..host..uri, 301)
			end
		end

		if res["targetssl"] == "true" then
			ngx.var.target_scheme = "https"
		end

		if res["host-pass-though"] == "false" then
			ngx.var.header_host = res["ip"]
		end

		ngx.var.target = res["ip"]
		ngx.var.target_port = res["targetPort"]

		-- Per-host controls: IP allow/deny, rate limit, upstream headers, and
		-- the $skip_cache gate. May ngx.exit() (403/429).
		hostfeatures.access(ngx, res)
	}

	header_filter_by_lua_block {
		require("hostfeatures").header(ngx)
	}


	resolver 192.168.1.1 ipv6=off;  #8.8.4.4;  # use Google's open DNS server

	proxy_http_version 1.1;
	proxy_pass_request_headers on;

	# Response cache. Opt-in per host: $skip_cache is 0 only when the Host
	# record sets respcache_enabled. Global default TTL (48h) lives in
	# nginx.conf; upstream Cache-Control (private/no-store) is still honored.
	proxy_cache proxycache;
	proxy_cache_key $scheme$host$request_uri;
	proxy_cache_bypass $skip_cache;
	proxy_no_cache $skip_cache;

	proxy_pass $target_scheme://$target:$target_port;

	proxy_set_header Upgrade $http_upgrade;
	proxy_set_header Connection $connection_upgrade;
	proxy_ssl_session_reuse on;
	proxy_intercept_errors off;

	proxy_set_header Host $header_host;
	add_header X-Target-Host $target;
	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 $target_scheme;
	proxy_set_header Referer $target_scheme://$header_host;
	proxy_set_header Accept-Language $http_accept_language;
	proxy_set_header User-Agent $http_user_agent;

	sub_filter $target $host;
	sub_filter_once off;
  }
}