GramJs: Use "-1" DCs for file transfers (#1332)

src/lib/gramjs/Utils.js

@@ -605,37 +605,37 @@ function isListLike(item) {
     )
 }
 */
-function getDC(dcId) {
+function getDC(dcId, download = false) {
     // TODO Move to external config
     switch (dcId) {
         case 1:
             return {
                 id: 1,
-                ipAddress: 'zws1.web.telegram.org',
+                ipAddress: `zws1${download ? '-1' : ''}.web.telegram.org`,
                 port: 443,
             };
         case 2:
             return {
                 id: 2,
-                ipAddress: 'zws2.web.telegram.org',
+                ipAddress: `zws2${download ? '-1' : ''}.web.telegram.org`,
                 port: 443,
             };
         case 3:
             return {
                 id: 3,
-                ipAddress: 'zws3.web.telegram.org',
+                ipAddress: `zws3${download ? '-1' : ''}.web.telegram.org`,
                 port: 443,
             };
         case 4:
             return {
                 id: 4,
-                ipAddress: 'zws4.web.telegram.org',
+                ipAddress: `zws4${download ? '-1' : ''}.web.telegram.org`,
                 port: 443,
             };
         case 5:
             return {
                 id: 5,
-                ipAddress: 'zws5.web.telegram.org',
+                ipAddress: `zws5${download ? '-1' : ''}.web.telegram.org`,
                 port: 443,
             };
         default:

src/lib/gramjs/client/TelegramClient.js

@@ -325,7 +325,7 @@ class TelegramClient {
     }
 
     async _connectSender(sender, dcId) {
-        const dc = utils.getDC(dcId);
+        const dc = utils.getDC(dcId, true);
 
         while (true) {
             try {