Add Deluge widget

- Create semi-generic jsonrpc proxy handler
- Refactor NZBGet to use jsonrpc proxy handler

closes #190

src/widgets/deluge/component.jsx

@@ -0,0 +1,52 @@
+import { useTranslation } from "next-i18next";
+
+import Container from "components/services/widget/container";
+import Block from "components/services/widget/block";
+import useWidgetAPI from "utils/proxy/use-widget-api";
+
+export default function Component({ service }) {
+  const { t } = useTranslation();
+
+  const { widget } = service;
+
+  const { data: torrentData, error: torrentError } = useWidgetAPI(widget);
+
+  if (torrentError) {
+    return <Container error={torrentError} />;
+  }
+
+  if (!torrentData) {
+    return (
+      <Container service={service}>
+        <Block label="deluge.leech" />
+        <Block label="deluge.download" />
+        <Block label="deluge.seed" />
+        <Block label="deluge.upload" />
+      </Container>
+    );
+  }
+
+  const { torrents } = torrentData;
+  let count = 0;
+  let rateDl = 0;
+  let rateUl = 0;
+  let completed = 0;
+  for (const key of Object.keys(torrents)) {
+    const torrent = torrents[key];
+    count += 1;
+    rateDl += torrent.download_payload_rate;
+    rateUl += torrent.upload_payload_rate;
+    completed += torrent.total_remaining === 0 ? 1 : 0;
+  }
+
+  const leech = count - completed || 0;
+
+  return (
+    <Container service={service}>
+      <Block label="deluge.leech" value={t("common.number", { value: leech })} />
+      <Block label="deluge.download" value={t("common.bitrate", { value: rateDl })} />
+      <Block label="deluge.seed" value={t("common.number", { value: completed })} />
+      <Block label="deluge.upload" value={t("common.bitrate", { value: rateUl })} />
+    </Container>
+  );
+}