泡泡SpringSecurity4.2【SpringSecurity核心源码分析-第一次请求】

doFilter处理用户请求
doFilterInternal根据当前的请求获取对应的过滤器链
主要过滤器：主要过滤器 | ProcessOn免费在线作图,在线流程图,在线思维导图
private String generateLoginPageHtml(HttpServletRequest request, boolean loginError, boolean logoutSuccess) {
        String errorMsg = "Invalid credentials";
        if (loginError) {
            HttpSession session = request.getSession(false);
            if (session != null) {
                AuthenticationException ex = (AuthenticationException)session.getAttribute("SPRING_SECURITY_LAST_EXCEPTION");
                errorMsg = ex != null ? ex.getMessage() : "Invalid credentials";
            }
        }

        StringBuilder sb = new StringBuilder();
        sb.append("<!DOCTYPE html>\n<html lang=\"en\">\n  <head>\n    <meta charset=\"utf-8\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1, shrink-to-fit=no\">\n    <meta name=\"description\" content=\"\">\n    <meta name=\"author\" content=\"\">\n    <title>Please sign in</title>\n    <link href=\"https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css\" rel=\"stylesheet\" integrity=\"sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M\" crossorigin=\"anonymous\">\n    <link href=\"https://getbootstrap.com/docs/4.0/examples/signin/signin.css\" rel=\"stylesheet\" crossorigin=\"anonymous\"/>\n  </head>\n  <body>\n     <div class=\"container\">\n");
        String contextPath = request.getContextPath();
        if (this.formLoginEnabled) {
            sb.append("      <form class=\"form-signin\" method=\"post\" action=\"" + contextPath + this.authenticationUrl + "\">\n        <h2 class=\"form-signin-heading\">Please sign in</h2>\n" + createError(loginError, errorMsg) + createLogoutSuccess(logoutSuccess) + "        <p>\n          <label for=\"username\" class=\"sr-only\">Username</label>\n          <input type=\"text\" id=\"username\" name=\"" + this.usernameParameter + "\" class=\"form-control\" placeholder=\"Username\" required autofocus>\n        </p>\n        <p>\n          <label for=\"password\" class=\"sr-only\">Password</label>\n          <input type=\"password\" id=\"password\" name=\"" + this.passwordParameter + "\" class=\"form-control\" placeholder=\"Password\" required>\n        </p>\n" + this.createRememberMe(this.rememberMeParameter) + this.renderHiddenInputs(request) + "        <button class=\"btn btn-lg btn-primary btn-block\" type=\"submit\">Sign in</button>\n      </form>\n");
        }

        if (this.openIdEnabled) {
            sb.append("      <form name=\"oidf\" class=\"form-signin\" method=\"post\" action=\"" + contextPath + this.openIDauthenticationUrl + "\">\n        <h2 class=\"form-signin-heading\">Login with OpenID Identity</h2>\n" + createError(loginError, errorMsg) + createLogoutSuccess(logoutSuccess) + "        <p>\n          <label for=\"username\" class=\"sr-only\">Identity</label>\n          <input type=\"text\" id=\"username\" name=\"" + this.openIDusernameParameter + "\" class=\"form-control\" placeholder=\"Username\" required autofocus>\n        </p>\n" + this.createRememberMe(this.openIDrememberMeParameter) + this.renderHiddenInputs(request) + "        <button class=\"btn btn-lg btn-primary btn-block\" type=\"submit\">Sign in</button>\n      </form>\n");
        }

        if (this.oauth2LoginEnabled) {
            sb.append("<h2 class=\"form-signin-heading\">Login with OAuth 2.0</h2>");
            sb.append(createError(loginError, errorMsg));
            sb.append(createLogoutSuccess(logoutSuccess));
            sb.append("<table class=\"table table-striped\">\n");
            Iterator var7 = this.oauth2AuthenticationUrlToClientName.entrySet().iterator();

            while(var7.hasNext()) {
                Entry<String, String> clientAuthenticationUrlToClientName = (Entry)var7.next();
                sb.append(" <tr><td>");
                String url = (String)clientAuthenticationUrlToClientName.getKey();
                sb.append("<a href=\"").append(contextPath).append(url).append("\">");
                String clientName = HtmlUtils.htmlEscape((String)clientAuthenticationUrlToClientName.getValue());
                sb.append(clientName);
                sb.append("</a>");
                sb.append("</td></tr>\n");
            }

            sb.append("</table>\n");
        }

        sb.append("</div>\n");
        sb.append("</body></html>");
        return sb.toString();
    }
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原文地址：https://www.cnblogs.com/yppah/p/15163232.html