Implement file download

-import React, { Fragment } from "react";
+import React from "react";
 import { FileItem } from "./useFileList";
 import { Link } from "react-router-dom";
+import { Button } from "antd";
 
 import { FolderFilled, FileFilled } from "@ant-design/icons";
+import { useDownload } from "./useDownload";
 
 export function FileListItem({ item }: { item: FileItem }) {
+  const download = useDownload();
   return item.is_folder ? (
-    <Fragment>
-      <Link to={`/folder/${item.id}`}>
-        <FolderFilled /> {item.name}
-      </Link>
-    </Fragment>
+    <Link to={`/folder/${item.id}`}>
+      <FolderFilled /> {item.name}
+    </Link>
   ) : (
-    <Fragment>
+    <Button
+      type="link"
+      size="small"
+      onClick={() => download(item.id)}
+      style={{ padding: 0 }}
+    >
       <FileFilled /> {item.name}
-    </Fragment>
+    </Button>
   );
 }

+import { useApi } from "util/useApi";
+import { useCallback } from "react";
+
+function downloadURL(url: string, name: string) {
+  const link = document.createElement("a");
+  link.setAttribute("download", name);
+  link.href = url;
+  link.target = "_blank";
+  link.click();
+}
+
+export function useDownload() {
+  const api = useApi();
+  const download = useCallback(
+    async (id: number) => {
+      const response = await api.get(`/items/${id}/`).json<any>();
+      const { signed_url, name } = response.data;
+      downloadURL(signed_url, name);
+    },
+    [api]
+  );
+  return download;
+}