conditionally send proxy protocol

hosts/proxy/default.nix

@@ -98,108 +98,126 @@
           domain = "docs.adm.htw.stura-dresden.de";
           httpPort = 8080;
           httpsPort = 8443;
+          sendProxy = false;
         };
         plone = {
           dest = "141.56.51.3";
           domain = "stura.htw-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         plone_alt = {
           dest = "141.56.51.3";
           domain = "www.stura.htw-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         plone_neu = {
           dest = "141.56.51.3";
           domain = "www.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         plone_neu2 = {
           dest = "141.56.51.3";
           domain = "htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         tix = {
           dest = "141.56.51.220";
           domain = "tix.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         post = {
           dest = "141.56.51.56";
           domain = "post.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         vot = {
           dest = "141.56.51.57";
           domain = "vot.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         mail = {
           dest = "141.56.51.14";
           domain = "mail.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         lists = {
           dest = "141.56.51.14";
           domain = "lists.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         dat = {
           dest = "141.56.51.17";
           domain = "dat.stu.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         pro = {
           dest = "141.56.51.15";
           domain = "pro.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         cloud = {
           dest = "141.56.51.16";
           domain = "cloud.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         wiki = {
           dest = "141.56.51.13";
           domain = "wiki.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         beach = {
           dest = "141.56.51.51";
           domain = "beach.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         studicloud = {
           dest = "141.56.51.17";
           domain = "dat.stu.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         bbb = {
           dest = "141.56.51.94";
           domain = "bbb.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         bbb-test = {
           dest = "141.56.51.94";
           domain = "bbb.test.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
       }
       # zusätzlich zu den oben definierten wird hier noch ein redirect für jeden nginx virtualhost in diese flake generiert
@@ -218,6 +236,10 @@
           prev
           // (builtins.foldl' (
             val: vhost:
+              let
+                proxyProtocol = if self.nixosConfigurations.${name}.config.services.nginx.virtualHosts.${vhost}.listen == [] then false else 
+                  true;
+              in
             val
             // {
               "${vhost}" = {
@@ -225,6 +247,7 @@
                 domain = vhost;
                 httpsPort = 443;
                 httpPort = 80;
+                sendProxy = proxyProtocol;
               };
             }
           ) { } vhosts)
@@ -519,13 +542,13 @@
 
               backend ${name}_80
                 mode http
-                server ${name} ${value.dest}:${builtins.toString value.httpPort}
+                server ${name} ${value.dest}:${builtins.toString value.httpPort} ${if value.sendProxy == true then "send-proxy-v2" else ""}
               backend ${name}_443
                 mode tcp
                 option tcpka  # Enable server TCP keep-alive (Phase 4)
                 timeout server 60s  # Increase from 30s for long-lived HTTPS
                 timeout connect 3s  # Reduce from 5s (local network)
-                server ${name} ${value.dest}:${builtins.toString value.httpsPort} check inter 3000 rise 2 fall 3 maxconn 5000
+                server ${name} ${value.dest}:${builtins.toString value.httpsPort} ${if value.sendProxy == true then "send-proxy-v2" else ""} check inter 3000 rise 2 fall 3 maxconn 5000
 
             ''
           ) "" forwards}