package com.atlassian.sal.core.xsrf;
   
   import com.atlassian.sal.api.xsrf.XsrfTokenAccessor;
   import com.atlassian.sal.api.xsrf.XsrfTokenValidator;
   import com.atlassian.security.utils.ConstantTimeComparison;
   
   import javax.servlet.http.HttpServletRequest;
   
   /**
   * XSRF token validator that manages its own tokens, not using the underlying applications XSRF tokens
   *
   * @since 2.4
   */
  public class IndependentXsrfTokenValidator implements XsrfTokenValidator {
      public static final String XSRF_PARAM_NAME = "atl_token";
  
      private XsrfTokenAccessor accessor;
  
      public IndependentXsrfTokenValidator(XsrfTokenAccessor accessor) {
          this.accessor = accessor;
      }
  
      public boolean validateFormEncodedToken(HttpServletRequest request) {
          String parameterToken = request.getParameter(XSRF_PARAM_NAME);
          String requestToken = accessor.getXsrfToken(request, null, false);
  
          return parameterToken != null && requestToken != null && ConstantTimeComparison.isEqual(parameterToken, requestToken);
      }
  
      public String getXsrfParameterName() {
          return XSRF_PARAM_NAME;
      }
  }