fix: handle token expiry (#3847)

packages/netlify-cms-lib-util/src/AccessTokenError.ts

@@ -0,0 +1,11 @@
+export const ACCESS_TOKEN_ERROR = 'ACCESS_TOKEN_ERROR';
+
+export default class AccessTokenError extends Error {
+  message: string;
+
+  constructor(message: string) {
+    super(message);
+    this.message = message;
+    this.name = ACCESS_TOKEN_ERROR;
+  }
+}

packages/netlify-cms-lib-util/src/implementation.ts

@@ -84,6 +84,8 @@ export type Config = {
     large_media_url?: string;
     use_large_media_transforms_in_media_library?: boolean;
     proxy_url?: string;
+    auth_type?: string;
+    app_id?: string;
   };
   media_folder: string;
   base_url?: string;
@@ -139,6 +141,7 @@ export interface Implementation {
   ) => Promise<{ entries: ImplementationEntry[]; cursor: Cursor }>;
 
   isGitBackend?: () => boolean;
+  status: () => Promise<{ auth: boolean }>;
 }
 
 const MAX_CONCURRENT_DOWNLOADS = 10;

packages/netlify-cms-lib-util/src/index.ts

@@ -1,6 +1,7 @@
 import APIError from './APIError';
 import Cursor, { CURSOR_COMPATIBILITY_SYMBOL } from './Cursor';
 import EditorialWorkflowError, { EDITORIAL_WORKFLOW_ERROR } from './EditorialWorkflowError';
+import AccessTokenError from './AccessTokenError';
 import localForage from './localForage';
 import { isAbsolutePath, basename, fileExtensionWithSeparator, fileExtension } from './path';
 import { onlySuccessfulPromises, flowAsync, then } from './promise';
@@ -138,6 +139,7 @@ export const NetlifyCmsLibUtil = {
   blobToFileObj,
   requestWithBackoff,
   allEntriesByFolder,
+  AccessTokenError,
 };
 export {
   APIError,
@@ -192,4 +194,5 @@ export {
   blobToFileObj,
   requestWithBackoff,
   allEntriesByFolder,
+  AccessTokenError,
 };