web-redirect: init new service for simple domain redirects

services/default.nix

@@ -8,5 +8,6 @@
     ./navidrome.nix
     ./pipewire-low-latency.nix
     ./remote-builder.nix
+    ./web-redirect.nix
   ];
-}
+}

services/web-redirect.nix

@@ -0,0 +1,30 @@
+{ config, lib, pkgs, ... }:
+
+let
+  inherit (lib) mkIf mkOption mkEnableOption types;
+  cfg = config.fountain.services.web-redirect;
+in
+{
+  options.fountain.services.web-redirect = {
+    enable = mkEnableOption "Module to do simple 301 redirects from one domain to another";
+    domains = mkOption {
+      type = types.attrsOf types.str;
+      description = "Mapping from source domain to destination domain";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services.nginx = {
+      enable = true;
+      virtualHosts = builtins.mapAttrs
+        (name: value: {
+          forceSSL = true;
+          enableACME = true;
+          locations."/".return = "301 https://${value}$request_uri";
+        })
+        cfg.domains;
+    };
+
+    networking.firewall.allowedTCPPorts = [ 80 443 ];
+  };
+}