Cross-site file fetching test in the Hypothesis LMS app

google-drive-test.diff

diff --git a/lms/static/scripts/frontend_apps/components/FilePickerApp.js b/lms/static/scripts/frontend_apps/components/FilePickerApp.js
index 1e32c81..a040a75 100644
--- a/lms/static/scripts/frontend_apps/components/FilePickerApp.js
+++ b/lms/static/scripts/frontend_apps/components/FilePickerApp.js
@@ -91,9 +91,11 @@ export default function FilePickerApp({
     try {
       setLoadingIndicatorVisible(true);
       const { id, url } = await googlePicker.showPicker();
+      await googlePicker.fetchFile(id);
       await googlePicker.enablePublicViewing(id);
       setUrl(url);
-      submit(true);
+      // TESTING
+      // submit(true);
     } catch (error) {
       setLoadingIndicatorVisible(false);
       if (!(error instanceof PickerCanceledError)) {
diff --git a/lms/static/scripts/frontend_apps/utils/google-picker-client.js b/lms/static/scripts/frontend_apps/utils/google-picker-client.js
index 44877c0..c3db8d0 100644
--- a/lms/static/scripts/frontend_apps/utils/google-picker-client.js
+++ b/lms/static/scripts/frontend_apps/utils/google-picker-client.js
@@ -124,6 +124,30 @@ export class GooglePickerClient {
     });
   }
 
+  async fetchFile(docId) {
+    const gapiClient = await this._gapiClient;
+
+    await gapiClient.init({
+      apiKey: this._developerKey,
+      clientId: this._clientId,
+      discoveryDocs: [
+        'https://www.googleapis.com/discovery/v1/apis/drive/v3/rest',
+      ],
+      scope: GOOGLE_DRIVE_SCOPE,
+    });
+
+    const request = gapiClient.drive.files.get({
+      fileId: docId,
+      alt: 'media',
+    });
+
+    return request.then(result => {
+      console.log('Google Drive fetch request result', result);
+    }).catch(err => {
+      console.log('Google Drive fetch request failure', err);
+    });
+  }
+
   /**
    * Change the sharing settings on a document in Google Drive to make it
    * publicly viewable to anyone with the link.