ReportGenerator.java

//.. Imports

public class ReportGenerator {
	  private final HttpServletRequest request;
	  private final WebDriver webDriver;

	  public ReportGenerator(HttpServletRequest request){
	  	this.request = request;
		this.webDriver = new ChromeDriver(...);
	  }
	
	  public Report createReport(){
		  // Important part
		  this.webDriver.get("<your app login page>");
		  
		  // Copy cookies from request sent by user
		  Arrays.stream(this.request.getCookies()).forEach(cookie -> {
            this.webDriver.manage().addCookie(new Cookie(cookie.getName(), cookie.getValue(), domain, null, null));
          });
		  
		  // Login Achieved.  Now go to whichever page you wish, without login!!
		  this.webDriver.get("<any page user can access>");  
		  // Now Take Screenshots, Export Report etc.
		  
		  return report; // Not defined, but assume it has necessary data
		  
	  }
}