Refactor flake.nix parts into separate files

flake.nix

@@ -1,5 +1,5 @@
 {
-  description = "A very basic flake";
+  description = "Content and server config for erambler.co.uk";
 
   inputs.nixpkgs.url = "github:NixOS/nixpkgs";
   inputs.flake-utils.url = "github:numtide/flake-utils";
@@ -8,39 +8,9 @@
     (flake-utils.lib.eachDefaultSystem (system:
       let pkgs = nixpkgs.legacyPackages.${system};
       in {
-        defaultPackage = pkgs.stdenv.mkDerivation {
-          name = "erambler-html";
-          src = ./.;
-          nativeBuildInputs = [ pkgs.hugo ];
-          buildPhase = "hugo";
-          installPhase = ''
-            mkdir $out
-            cp -R public/* public/.well-known $out
-          '';
-        };
-
-        devShell = pkgs.mkShell {
-          buildInputs = with pkgs; [
-            (python38.withPackages
-              (py: with py; [ python invoke rich requests ruamel_yaml sh ]))
-            yarn
-            hugo
-          ];
-        };
+        defaultPackage = pkgs.callPackage ./nix/build.nix { };
+        devShell = pkgs.callPackage ./nix/shell.nix { };
       })) // {
-        nixosModule = { config, pkgs, ... }: {
-          services.nginx = {
-            enable = true;
-
-            virtualHosts."erambler.co.uk" = {
-              enableACME = true;
-              forceSSL = true;
-
-              root = self.defaultPackage.${pkgs.system};
-            };
-          };
-
-          networking.firewall.allowedTCPPorts = [ 80 443 ];
-        };
+        nixosModule = import ./nix/server.nix;
       };
 }

nix/build.nix

@@ -0,0 +1,13 @@
+{ pkgs, ... }:
+
+with pkgs;
+stdenv.mkDerivation {
+  name = "erambler-html";
+  src = ./.;
+  nativeBuildInputs = [ hugo ];
+  buildPhase = "hugo";
+  installPhase = ''
+    mkdir $out
+    cp -R public/* public/.well-known $out
+  '';
+}

nix/server.nix

@@ -0,0 +1,27 @@
+{ config, pkgs, ... }:
+
+{
+  services.nginx = {
+    enable = true;
+
+    virtualHosts."erambler.co.uk" = {
+      enableACME = true;
+      forceSSL = true;
+
+      root = self.defaultPackage.${pkgs.system};
+      extraConfig = ''
+        rewrite ^/.well-known/(host-meta|webfinger).* https://fed.brid.gy$request_uri redirect;
+      '';
+      locations = {
+        "~ ^/(feed|rss)(\\.xml|/)".return = "301 /index.xml";
+        "~ ^/tags/([a-zA-Z-]+)\\.xml".return = "301 /tags/$1/index.xml";
+
+        "/index.xml".extraConfig = ''
+          add_header Link '<https://erambler.co.uk/rss.xml>; rel="self"';
+        '';
+      };
+    };
+  };
+
+  networking.firewall.allowedTCPPorts = [ 80 443 ];
+}

nix/shell.nix

@@ -0,0 +1,11 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+with pkgs;
+mkShell {
+  buildInputs = [
+    (python38.withPackages
+      (py: with py; [ python invoke rich requests ruamel_yaml sh ]))
+    yarn
+    hugo
+  ];
+}