Fix custom endpoints

lib/endpoint.js

@@ -29,6 +29,9 @@ let backupEndpointsQueryUrl =
   'https://cdn.jsdelivr.net/gh/reactnativecn/react-native-pushy@master/endpoints.json';
 
 export async function tryBackupEndpoints() {
+  if (!backupEndpoints.length && !backupEndpointsQueryUrl) {
+    return;
+  }
   try {
     await ping(getStatusUrl(), true);
     logger('current endpoint ok');
@@ -73,10 +76,14 @@ export function getCheckUrl(APPKEY, endpoint = currentEndpoint) {
   return `${endpoint}/checkUpdate/${APPKEY}`;
 }
 
-export function setCustomEndpoints(mainEndpoint, backups) {
-  currentEndpoint = mainEndpoint;
+export function setCustomEndpoints({ main, backups, backupQueryUrl }) {
+  currentEndpoint = main;
+  backupEndpointsQueryUrl = null;
   if (Array.isArray(backups) && backups.length > 0) {
     backupEndpoints = backups;
     pickFatestAvailableEndpoint();
   }
+  if (typeof backupQueryUrl === 'string') {
+    backupEndpointsQueryUrl = backupQueryUrl;
+  }
 }

lib/index.d.ts

@@ -21,7 +21,7 @@ export interface UpdateAvailableResult {
   metaInfo: string;
   pdiffUrl: string;
   diffUrl?: string;
-};
+}
 
 export type CheckResult =
   | ExpiredResult
@@ -40,7 +40,18 @@ export function switchVersionLater(hash: string): void;
 
 export function markSuccess(): void;
 
-export function setCustomEndpoints(
-  mainEndpoint: string,
-  backupEndpoints?: string[],
-): void;
+/**
+ * @param {string} main - The main api endpoint
+ * @param {string[]} [backups] - The back up endpoints.
+ * @param {string} [backupQueryUrl] - An url that return a json file containing an array of endpoint.
+ *                                    like: ["https://backup.api/1", "https://backup.api/2"]
+ */
+export function setCustomEndpoints({
+  main,
+  backups,
+  backupQueryUrl,
+}: {
+  main: string;
+  backUps?: string[];
+  backupQueryUrl?: string;
+}): void;