Add qBittorrent Widget

- extract cookie jar functionality into its own file
- use i18n for more strings in existing widgets

completes: #152
associated: #123

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

@@ -0,0 +1,69 @@
+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 QBittorrent ({ service }) {
+  const { t } = useTranslation();
+
+  const config = service.widget;
+
+  const { data: torrentData, error: torrentError } = useSWR(formatApiUrl(config, "torrents/info"));
+
+  if (torrentError) {
+    return <Widget error={t("widget.api_error")} />;
+  }
+
+  if (!torrentData) {
+    return (
+      <Widget>
+        <Block label={t("qbittorrent.leech")} />
+        <Block label={t("qbittorrent.download")} />
+        <Block label={t("qbittorrent.seed")} />
+        <Block label={t("qbittorrent.upload")} />
+      </Widget>
+    );
+  }
+
+  let rateDl = 0;
+  let rateUl = 0;
+  let completed = 0;
+
+  for (let i = 0; i < torrentData.length; i += 1) {
+    const torrent = torrentData[i];
+    rateDl += torrent.dlspeed;
+    rateUl += torrent.upspeed;
+    if (torrent.progress === 1) {
+      completed += 1;
+    }
+  }
+
+  const leech = torrentData.length - completed;
+
+  let unitsDl = "KB/s";
+  let unitsUl = "KB/s";
+  rateDl /= 1024;
+  rateUl /= 1024;
+
+  if (rateDl > 1024) {
+    rateDl /= 1024;
+    unitsDl = "MB/s";
+  }
+
+  if (rateUl > 1024) {
+    rateUl /= 1024;
+    unitsUl = "MB/s";
+  }
+
+  return (
+    <Widget>
+      <Block label={t("qbittorrent.leech")} value={t("common.number", { value: leech })} />
+      <Block label={t("qbittorrent.download")} value={`${rateDl.toFixed(2)} ${unitsDl}`} />
+      <Block label={t("qbittorrent.seed")} value={t("common.number", { value: completed })} />
+      <Block label={t("qbittorrent.upload")} value={`${rateUl.toFixed(2)} ${unitsUl}`} />
+    </Widget>
+  );
+}