Refresh Token Logic

readme.md

Refresh Token Logic

Created with <3 with dartpad.dev.

main.dart

import 'dart:async';
void main() {
  const monitor = 3000; // 3s
  
  Timer.periodic(Duration(seconds: monitor), (timer){
    print('Timer $timer');
    refreshTokenChk(monitor);
  });
}

void refreshTokenChk(int monitor) {
  print('Refresh Monitor Checker');
  const refreshTokenExpiresIn = 1696390306055; // 90 days
  const accessTokenExpiresIn = 1691209903; // 1 hour
  
 var refreshTokenExp = DateTime.now().millisecond + refreshTokenExpiresIn; 
  var accTokenExp = DateTime.now().millisecond + accessTokenExpiresIn;
  
  //Checks if refreshToken has expired
  if(DateTime.now().millisecond > refreshTokenExp) {
    print('RefreshToken Expired');
    //Need to log out the user to get new tokens
  }
  
  // Calculate the adjusted expiration time (2 minutes before actual expiration)
  var accTokenExpAdjusted = accTokenExp - (2 * 60 * 1000);

  if (DateTime.now().millisecondsSinceEpoch > accTokenExpAdjusted + monitor) {
    print('Access Token about to expire');
    // Refresh Access Token before it expires

  }
  
  if(DateTime.now().millisecond > accTokenExp + monitor){
    print('Access Token expired');
    // Need to refresh the accesss token
  }
}