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diff --git a/flake.nix b/flake.nix
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diff --git a/justfile b/justfile
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diff --git a/nix/devShells/flake-module.nix b/nix/devShells/flake-module.nix
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diff --git a/nix/modules/customer-portal/default.nix b/nix/modules/customer-portal/default.nix
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diff --git a/nix/modules/customer-portal/flake-module.nix b/nix/modules/customer-portal/flake-module.nix
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index 041d2c1..b11b86f
--- a/nix/modules/customer-portal/flake-module.nix
+++ b/nix/modules/customer-portal/flake-module.nix
@@ -1,16 +1,144 @@
-{ ... }:
+{ moduleWithSystem, ... }:
 {
-  flake = {
-    nixosModules = {
-      # default = self'.nixosModules.amarth-customer-portal;
+  flake.nixosModules.default = moduleWithSystem (
+    perSystem@{ config, lib, pkgs, utils, ... }:
+    nixos@{ ... }:
+    let
+      inherit (lib) mkEnableOption mkPackageOption mkOption mkIf types;
 
-      # amarth-customer-portal = { ... }: {
-      #   imports = [ ./default.nix ];
-      # };
+      format = pkgs.formats.json {};
 
-      default = { ... }: {
-        imports = [ ./default.nix ];
+      cfg = config.services.amarth-customer-portal;
+    in
+    {
+      options.services.amarth-customer-portal = {
+        enable = mkEnableOption "Enable Amarth cloud's customer portal.";
+
+        package = mkPackageOption config.packages "amarth-customer-portal" {};
+
+        openFirewall = mkOption {
+          type = types.bool;
+          default = false;
+          example = "true";
+          description = ''
+            Open the configured port in the firewall.
+          '';
+        };
+
+        user = lib.mkOption {
+          type = types.str;
+          default = "amarth";
+          description = ''
+            User account under which FileBrowser runs.
+          '';
+        };
+
+        group = lib.mkOption {
+          type = types.str;
+          default = "amarth";
+          description = ''
+            Group under which FileBrowser runs.
+          '';
+        };
+
+        settings = mkOption {
+          default = {};
+          description = ''
+          '';
+          type = types.submodule {
+            freeformType = format.type;
+
+            options = {
+              address = mkOption {
+                default = "localhost";
+                description = ''
+                  The address to listen on.
+                '';
+                type = types.str;
+              };
+
+              port = mkOption {
+                type = types.port;
+                default = 8080;
+                description = ''
+                  Which port to run the portal on.
+                '';
+              };
+
+              dataDir = lib.mkOption {
+                default = "/var/lib/amarth/customer-portal";
+                description = ''
+                  Directory where the portal persists files.
+                '';
+                type = types.path;
+              };
+            };
+          };
+        };
       };
-    };
-  };
+
+      config = mkIf cfg.enable {
+        systemd = {
+          services.amarthCustomerPortal = {
+            after = [ "network.target" ];
+            wantedBy = [ "multi-user.target" ];
+
+            description = "Amarth cloud's customer portal";
+
+            serviceConfig = {
+              ExecStart = utils.escapeSystemdExecArgs [
+                (lib.getExe cfg.package)
+                "--config"
+                (format.generate "config.json" cfg.settings)
+              ];
+
+              StateDirectory = "amarth-customer-portal";
+              CacheDirectory = "amarth-customer-portal";
+              WorkingDirectory = cfg.settings.dataDir;
+
+              User = cfg.user;
+              Group = cfg.group;
+              UMask = "0077";
+
+              NoNewPrivileges = true;
+              PrivateDevices = true;
+              ProtectKernelTunables = true;
+              ProtectKernelModules = true;
+              ProtectControlGroups = true;
+              MemoryDenyWriteExecute = true;
+              LockPersonality = true;
+              RestrictAddressFamilies = [
+                "AF_UNIX"
+                "AF_INET"
+                "AF_INET6"
+              ];
+              DevicePolicy = "closed";
+              RestrictNamespaces = true;
+              RestrictRealtime = true;
+              RestrictSUIDSGID = true;
+            };
+          };
+
+          tmpfiles.settings.amarth-customer-portal = {
+            "${cfg.settings.dataDir}".d = {
+              inherit (cfg) user group;
+              mode = "0700";
+            };
+          };
+        };
+
+        users = {
+          users = mkIf (cfg.user == "amarth") {
+            amarth = { inherit (cfg) group; isSystemUser = true; };
+          };
+
+          groups = mkIf (cfg.group == "amarth") {
+            amarth = {};
+          };
+        };
+
+        networking.firewall.allowedTCPPorts = mkIf cfg.openFirewall [ cfg.settings.port ];
+      };
+    }
+  );
 }
\ No newline at end of file
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