User Agent string in fetch requests

src/WAConnection/Base.ts

@@ -59,8 +59,9 @@ export default class WAConnectionBase {
     protected pendingRequests: (() => void)[] = []
     protected reconnectLoop: () => Promise<void>
     protected referenceDate = new Date () // used for generating tags
-
+    protected userAgentString: string 
     constructor () {
+        this.userAgentString = Utils.userAgentString (this.browserDescription[1])
         this.registerCallback (['Cmd', 'type:disconnect'], json => this.unexpectedDisconnect(json[1].kind))
     }
     async unexpectedDisconnect (error: string) {

src/WAConnection/Utils.ts

@@ -3,6 +3,7 @@ import HKDF from 'futoin-hkdf'
 import Decoder from '../Binary/Decoder'
 import {platform, release} from 'os'
 import { BaileysError } from './Constants'
+import UserAgent from 'user-agents'
 
 const platformMap = {
     'aix': 'AIX',
@@ -17,6 +18,10 @@ export const Browsers = {
     /** The appropriate browser based on your OS & release */
     appropriate: browser => [ platformMap [platform()] || 'Ubuntu', browser, release() ] as [string, string, string]
 }
+export function userAgentString (browser) {
+    const agent = new UserAgent (new RegExp(browser))
+    return agent.toString ()
+}
 /** decrypt AES 256 CBC; where the IV is prefixed to the buffer */
 export function aesDecrypt(buffer: Buffer, key: Buffer) {
     return aesDecryptWithIV(buffer.slice(16, buffer.length), key, buffer.slice(0, 16))