/** The sitemap parameter holding the token context */
    protected static final String SITEMAP_PARAMETER_TOKEN_CONTEXT= "token-context";
    
    @Override
    protected boolean _handleAuthenticationToken(Request request, Parameters parameters)
    {
        String token = request.getHeader(HEADER_TOKEN);
        if (StringUtils.isBlank(token))
        {
            token = parameters.getParameter(PARAMETERS_PARAMETER_TOKEN, _getTokenFromRequest(request));
        }

        String tokenContext = parameters.getParameter(SITEMAP_PARAMETER_TOKEN_CONTEXT, null);
        
        if (StringUtils.isNotBlank(token))
        {
            UserIdentity userIdentity = _validateToken(token, tokenContext);
            if (userIdentity != null)
            {
                // Save user identity
                _setUserIdentityInSession(request, userIdentity, new UserDAO.ImpersonateCredentialProvider(), true);
                _validateCurrentlyConnectedUserIsInAuthorizedPopulation(userIdentity, request, parameters);
                return true;
            }
        }
        
        return false;
    }

    /**
     * Validate the given token
     * @param token The non empty token to validate
     * @param tokenContext The context token
     * @return The corresponding user identity or null
     */
    protected UserIdentity _validateToken(String token, String tokenContext)
    {
        return _authenticateTokenManager != null ? _authenticateTokenManager.validateToken(token, tokenContext) : null;
    }