fix(nixos): derive homepage hosts from joined registry

configs/nixos/guests/homepage.nix

@@ -9,7 +9,10 @@ in
 {
   config = lib.mkIf cfg.enable {
     guests.homepage = {
-      interior.modules.services.homepage.enable = true;
+      interior.modules.services.homepage = {
+        enable = true;
+        hostName = config.networking.hostName;
+      };
 
       limits = {
         memory = lib.mkDefault "1G";

configs/nixos/modules/services/homepage.nix

@@ -6,7 +6,6 @@
 }:
 let
   cfg = config.modules.services.homepage;
-  entryName = config.networking.hostName;
 
   mkRegistryPath = registryName: host: entry: "registry.${registryName}.${host}.${entry}";
 
@@ -23,10 +22,15 @@ let
   mkHref = item:
     if item.homepage.href != null then
       item.homepage.href
-    else if (item.composite.route or null) != null && item.composite.route.port != null then
-      "https://${item.composite.route.domain}"
+    else if (item.composite.route or null) != null then
+      if item.composite.route.port != null then
+        "https://${item.composite.route.domain}"
+      else if item.composite.route.http.port != null then
+        "http://${item.composite.route.domain}"
+      else
+        throw "${mkRegistryPath "homepage" item.host item.entry} needs href or a matching TCP route entry"
     else
-      throw "${mkRegistryPath "homepage" item.host item.entry} needs href or a matching TCP route entry";
+      throw "${mkRegistryPath "homepage" item.host item.entry} needs href or a matching route entry";
 
   mkServiceAttrs = item:
     lib.filterAttrs (_: value: value != null) {
@@ -92,24 +96,16 @@ let
 
   homepageServices = map mkTab (lib.filter (tab: lib.hasAttr tab entriesByTab) orderedTabs);
 
-  matchingAddresses = lib.concatLists (
-    lib.mapAttrsToList (
-      _host: entries:
-      lib.optional (lib.hasAttr entryName entries) entries.${entryName}
-    ) registry.address
-  );
-
-  matchingDomains = lib.concatLists (
-    lib.mapAttrsToList (
-      _host: entries:
-      lib.optional (lib.hasAttr entryName entries) entries.${entryName}.domain
-    ) registry.route
-  );
+  selfEntry = registry.join cfg.hostName cfg.entryName;
+  selfAddress = selfEntry.address or null;
+  selfRoute = selfEntry.route or null;
 
   derivedAllowedHosts = lib.unique (
-    matchingDomains
-    ++ matchingAddresses
-    ++ map (address: "${address}:${toString cfg.listenPort}") matchingAddresses
+    lib.optional (selfRoute != null) selfRoute.domain
+    ++ lib.optionals (selfAddress != null) [
+      selfAddress
+      "${selfAddress}:${toString cfg.listenPort}"
+    ]
   );
 in
 {
@@ -122,6 +118,17 @@ in
       description = "Port for Homepage to bind to.";
     };
 
+    hostName = lib.mkOption {
+      type = lib.types.str;
+      description = "Host registry key that owns the Homepage guest entry.";
+    };
+
+    entryName = lib.mkOption {
+      type = lib.types.str;
+      default = "homepage";
+      description = "Registry entry name for this Homepage service.";
+    };
+
     allowedHosts = lib.mkOption {
       type = lib.types.nullOr (lib.types.listOf lib.types.str);
       default = null;