springSecurity学习之springSecurity web如何取得用户信息

web如何取得用户信息

之前说过SecurityContextHolder默认使用的是ThreadLocal来进行存储的，而且每次都会清除，但是web每次请求都会验证用户权限，这是如何做到的呢？

这是通过SecurityContextPersistenceFilter来实现的，每次请求过来都会session中来获取SecurityContext，然后设置到SecurityContextHolder中，请求结束后再清除掉

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)throws IOException, ServletException {HttpServletRequest request = (HttpServletRequest) req;HttpServletResponse response = (HttpServletResponse) res;if (request.getAttribute(FILTER_APPLIED) != null) {// ensure that filter is only applied once per requestchain.doFilter(request, response);return;}request.setAttribute(FILTER_APPLIED, Boolean.TRUE);HttpRequestResponseHolder holder = new HttpRequestResponseHolder(request,response);// 从session获取SecurityContextSecurityContext contextBeforeChainExecution = repo.loadContext(holder);try {// 将SecurityContext存入SecurityContextHolderSecurityContextHolder.setContext(contextBeforeChainExecution);chain.doFilter(holder.getRequest(), holder.getResponse());}finally {SecurityContext contextAfterChainExecution = SecurityContextHolder.getContext();// Crucial removal of SecurityContextHolder contents - do this before anything// else.SecurityContextHolder.clearContext();// 存储SecurityContextrepo.saveContext(contextAfterChainExecution, holder.getRequest(),holder.getResponse());request.removeAttribute(FILTER_APPLIED);}
}

loadContext获取SecurityContext

使用HttpSessionSecurityContextRepository

public SecurityContext loadContext(HttpRequestResponseHolder requestResponseHolder) {HttpServletRequest request = requestResponseHolder.getRequest();HttpServletResponse response = requestResponseHolder.getResponse();HttpSession httpSession = request.getSession(false);// 从session中获取SecurityContextSecurityContext context = readSecurityContextFromSession(httpSession);if (context == null) {context = generateNewContext();}SaveToSessionResponseWrapper wrappedResponse = new SaveToSessionResponseWrapper(response, request, httpSession != null, context);requestResponseHolder.setResponse(wrappedResponse);return context;
}

从session中获取SecurityContext

private SecurityContext readSecurityContextFromSession(HttpSession httpSession) {final boolean debug = logger.isDebugEnabled();if (httpSession == null) {return null;}// Session exists, so try to obtain a context from it.Object contextFromSession = httpSession.getAttribute(springSecurityContextKey);if (contextFromSession == null) {return null;}// Everything OK. The only non-null return from this method.return (SecurityContext) contextFromSession;
}

存储SecurityContext

public void saveContext(SecurityContext context, HttpServletRequest request,HttpServletResponse response) {SaveContextOnUpdateOrErrorResponseWrapper responseWrapper = WebUtils.getNativeResponse(response,SaveContextOnUpdateOrErrorResponseWrapper.class);if (!responseWrapper.isContextSaved()) {responseWrapper.saveContext(context);}
}

protected void saveContext(SecurityContext context) {final Authentication authentication = context.getAuthentication();HttpSession httpSession = request.getSession(false);// See SEC-776if (authentication == null || trustResolver.isAnonymous(authentication)) {if (httpSession != null && authBeforeExecution != null) {// SEC-1587 A non-anonymous context may still be in the session// SEC-1735 remove if the contextBeforeExecution was not anonymoushttpSession.removeAttribute(springSecurityContextKey);}return;}if (httpSession == null) {httpSession = createNewSessionIfAllowed(context);}// If HttpSession exists, store current SecurityContext but only if it has// actually changed in this thread (see SEC-37, SEC-1307, SEC-1528)if (httpSession != null) {// We may have a new session, so check also whether the context attribute// is set SEC-1561if (contextChanged(context)|| httpSession.getAttribute(springSecurityContextKey) == null) {// 存到session中httpSession.setAttribute(springSecurityContextKey, context);}}
}

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