AuthenticationFilter.java 文件源码

@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
    HttpServletRequest httpRequest = asHttp(request);
    HttpServletResponse httpResponse = asHttp(response);

    Optional<String> username = Optional.fromNullable(httpRequest.getParameter("username"));
    Optional<String> password = Optional.fromNullable(httpRequest.getParameter("password"));
    Optional<String> token = Optional.fromNullable(httpRequest.getHeader("Authorization"));

    String resourcePath = new UrlPathHelper().getPathWithinApplication(httpRequest);

    try {
        if (postToAuthenticate(httpRequest, resourcePath)) {
            logger.debug("Trying to authenticate user {} by Username method", username);
            processUsernamePasswordAuthentication(httpResponse, username, password);
            return;
        }

        if (token.isPresent()) {
            logger.debug("Trying to authenticate user by Token method. Token: {}", token);
            processTokenAuthentication(token);
        }

        logger.debug("AuthenticationFilter is passing request down the filter chain");
        addSessionContextToLogging();
        chain.doFilter(request, response);
    } catch (InternalAuthenticationServiceException internalAuthenticationServiceException) {
        SecurityContextHolder.clearContext();
        logger.error("Internal authentication service exception", internalAuthenticationServiceException);
        httpResponse.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    } catch (AuthenticationException authenticationException) {
        SecurityContextHolder.clearContext();
        httpResponse.sendError(HttpServletResponse.SC_UNAUTHORIZED, authenticationException.getMessage());
    } finally {
        MDC.remove(TOKEN_SESSION_KEY);
        MDC.remove(USER_SESSION_KEY);
    }
}