feat(webdav): WebDAV

modules/nixos/deertopia/webdav.nix

@@ -13,32 +13,54 @@ in {
         type = lib.types.port;
         description = ''
           The internal WebDAV port.  The actual server will be hosted at
-          https://dav.deertopia.net:80/.
+          https://dav.deertopia.net/.
         '';
       };
+
+      user = lib.mkOption {
+        default = "webdav";
+        type = lib.types.str;
+      };
+
+      group = lib.mkOption {
+        default = "webdav";
+        type = lib.types.str;
+      };
     };
   };
 
   config = mkIf cfg.enable {
-    systemd.services.deertopia-webdav-server =
-      let htpasswdFile = "/persist/deertopia.net/htpasswd";
-          directory = "/persist/deertopia.net/dav";
+    users.users.${cfg.user} = {
+      isSystemUser = true;
+      group = cfg.group;
+    };
+
+    users.groups.${cfg.group} = {};
+
+    systemd.services.webdav =
+      let htpasswdFile = "/run/secrets/webdav-htpasswd";
+          directory = "/var/lib/webdav";
       in {
         description = "Deertopia's WebDAV server";
         after = [ "network.target" ];
         wantedBy = [ "multi-user.target" ];
-        # TODO: Exclude .git.
-        # TODO: Respect .gitignore.
         script = ''
           ${pkgs.rclone}/bin/rclone serve webdav \
             --addr ":${builtins.toString cfg.port}" \
             --htpasswd "${htpasswdFile}" "${directory}"
         '';
-        serviceConfig.Restart = "always";
+        serviceConfig = {
+          User = cfg.user;
+          Group = cfg.group;
+          Restart = "always";
+        };
+        unitConfig = {
+          StateDirectory = "webdav";
+        };
       };
 
     # Without this, Nginx will attempt redirections to https://localhost, which
-    # is not okay, as localhost does not have any associated certs!
+    # is not okay because localhost does not have any associated certs!
     # See: https://forum.seafile.com/t/seafdav-move-command-causing-502/11582/26
     services.nginx.appendHttpConfig = ''
       map $http_destination $http_destination_webdav {
@@ -47,6 +69,25 @@ in {
       }
     '';
 
+    systemd.tmpfiles.settings."50-var-lib-webdav" =
+      let
+        e =
+          let x = { inherit (cfg) user group; mode = "2775"; };
+          in { z = x; v = x; };
+      in {
+        "/var/lib/webdav/~msyds/org" = e;
+        "/var/lib/webdav/~msyds/zotero" = e;
+      };
+
+    sydnix.sops.secrets.webdav-htpasswd = {
+      owner = cfg.user;
+      mode = "0600";
+    };
+
+    sydnix.impermanence.directories = [
+      "/var/lib/webdav"
+    ];
+
     sydnix.deertopia.nginx.vhosts."dav".vhost = {
       forceSSL = true;
       enableACME = true;