Implement file upload

-import React, { useCallback } from "react";
-import { Table, message, Button } from "antd";
+import React, { useCallback, useState } from "react";
+import { Table, message, Button, Popover } from "antd";
 import { ColumnsType } from "antd/lib/table";
 import filesize from "filesize";
 
@@ -10,10 +10,12 @@ import { FileListItem } from "./FileListItem";
 import { FileItemActions } from "./FileItemActions";
 
 import styles from "./FileList.module.scss";
+import { FileUploadPopover } from "./FileUploadPopover";
 
 export function FileList() {
   const id = useParams<{ id: string }>().id;
   const { data, reload } = useFileList(id);
+  const [upload, setUpload] = useState<boolean>(false);
 
   const api = useApi();
 
@@ -103,9 +105,16 @@ export function FileList() {
       <div className={styles.header}>
         <div>{data.parent !== null && <h3>{data.name}</h3>}</div>
         <div>
-          <Button type="link" size="small">
-            파일 업로드
-          </Button>
+          <Popover
+            content={<FileUploadPopover root={data.id} reload={reload} />}
+            trigger="click"
+            visible={upload}
+            onVisibleChange={setUpload}
+          >
+            <Button type="link" size="small">
+              파일 업로드
+            </Button>
+          </Popover>
           <Button type="link" size="small">
             새 폴더
           </Button>

+import React, { useCallback, useRef } from "react";
+import Dragger from "antd/lib/upload/Dragger";
+import { InboxOutlined } from "@ant-design/icons";
+import { useApi } from "util/useApi";
+
+export type FileUploadPopoverProps = {
+  root: number;
+  reload: () => void;
+};
+
+export function FileUploadPopover({ root, reload }: FileUploadPopoverProps) {
+  const api = useApi();
+  const fields = useRef<any>();
+  const stateMap = useRef<Record<string, number>>({});
+
+  const getS3Object = useCallback(
+    async (file: File) => {
+      const body = new URLSearchParams();
+      body.set("name", file.name);
+      body.set("size", file.size.toString());
+
+      const response = await api
+        .post(`/items/${root}/upload/`, { body })
+        .json<any>();
+
+      stateMap.current[file.name] = response.item.id;
+      fields.current = response.signed_url.fields;
+      return response.signed_url.url;
+    },
+    [api, root]
+  );
+
+  const setObjectStatus = useCallback(
+    async (info) => {
+      if (info.file.status === "done") {
+        const id = stateMap.current[info.file.name];
+        if (typeof id !== "undefined") {
+          const body = new URLSearchParams();
+          body.set("item_id", id.toString());
+          await api.post(`/items/${id}/status/`, { body });
+          reload();
+        }
+      }
+    },
+    [api, reload]
+  );
+
+  return (
+    <Dragger
+      name="file"
+      multiple={true}
+      action={getS3Object}
+      data={() => fields.current}
+      onChange={setObjectStatus}
+      style={{ padding: 40 }}
+    >
+      <p className="ant-upload-drag-icon">
+        <InboxOutlined />
+      </p>
+      <p className="ant-upload-text">
+        업로드할 파일을 선택하거나 드래그 하세요
+      </p>
+      <p className="ant-upload-hint"></p>
+    </Dragger>
+  );
+}