Optimize excalidraw code (#7942)

* optimize code

* optimize code

* optimize code

* optimize code

---------

Co-authored-by: 小强 <shuntian@Mac.lan>

frontend/src/pages/excalidraw-editor/api/index.js

@@ -0,0 +1,28 @@
+import axios from 'axios';
+
+class ExcalidrawServerApi {
+
+  constructor(options) {
+    this.server = options.exdrawServer;
+    this.docUuid = options.exdrawUuid;
+    this.accessToken = options.accessToken;
+  }
+
+  getSceneContent() {
+    const { server, docUuid, accessToken } = this;
+    const url = `${server}/api/v1/exdraw/${docUuid}/`;
+
+    return axios.get(url, { headers: { Authorization: `Token ${accessToken}` } });
+  }
+
+  saveSceneContent(content) {
+    const { server, docUuid, accessToken } = this;
+    const url = `${server}/api/v1/exdraw/${docUuid}/`;
+    const formData = new FormData();
+    formData.append('doc_content', content);
+
+    return axios.post(url, formData, { headers: { Authorization: `Token ${accessToken}` } });
+  }
+}
+
+export default ExcalidrawServerApi;