Add the Jackett widget

- add the follow-redirect package
- add the tough-cookie package

Jackett API uses a redirect mechanism to set a CSRF token.
This CSRF token is stored in a cookie that is required to
be present or the API won't work.

src/components/services/widget.jsx

@@ -22,6 +22,7 @@ import Tautulli from "./widgets/service/tautulli";
 import CoinMarketCap from "./widgets/service/coinmarketcap";
 import Gotify from "./widgets/service/gotify";
 import Prowlarr from "./widgets/service/prowlarr";
+import Jackett from "./widgets/service/jackett";
 
 const widgetMappings = {
   docker: Docker,
@@ -45,7 +46,8 @@ const widgetMappings = {
   npm: Npm,
   tautulli: Tautulli,
   gotify: Gotify,
-  prowlarr: Prowlarr
+  prowlarr: Prowlarr,
+  jackett: Jackett
 };
 
 export default function Widget({ service }) {

src/components/services/widgets/service/jackett.jsx

@@ -0,0 +1,37 @@
+import useSWR from "swr";
+import { useTranslation } from "react-i18next";
+
+import Widget from "../widget";
+import Block from "../block";
+
+import { formatApiUrl } from "utils/api-helpers";
+
+export default function Jackett({ service }) {
+  const { t } = useTranslation();
+
+  const config = service.widget;
+
+  const { data: indexersData, error: indexersError } = useSWR(formatApiUrl(config, "indexers"));
+
+  if (indexersError) {
+    return <Widget error={t("widget.api_error")} />;
+  }
+
+  if (!indexersData) {
+    return (
+      <Widget>
+        <Block label={t("jackett.configured")} />
+        <Block label={t("jackett.errored")} />
+      </Widget>
+    );
+  }
+
+  const errored = indexersData.filter((indexer) => indexer.last_error);
+
+  return (
+    <Widget>
+      <Block label={t("jackett.configured")} value={indexersData.length} />
+      <Block label={t("jackett.errored")} value={errored.length} />
+    </Widget>
+  );
+}