使用 Vaadin Flow (12.0.2)、Spring Boot Starter (2.0.2.RELEASE) 和 Spring Boot Security，基本上，我发现使用以下方式基于角色/权限进行授权；
基于路由/上下文的角色/权限管理
- 弹簧安全（HttpSecurity）
- Vaadin API（BeforeEnterListener 和 Route/Navigation API）
业务单位角色/权限管理
- 在代码里面使用 HttpServletRequest.isUserInRole 方法
让我们从一个简单的 Spring Security 配置示例开始；
@Configuration
@EnableWebSecurity
public class WebSecurityConfig
extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http) throws Exception {
http
.csrf().disable() // CSRF is handled by Vaadin: https://vaadin.com/framework/security
.exceptionHandling().accessDeniedPage("/accessDenied")
.authenticationEntryPoint(new LoginUrlAuthenticationEntryPoint("/login"))
.and().logout().logoutSuccessUrl("/")
.and()
.authorizeRequests()
// allow Vaadin URLs and the login URL without authentication
.regexMatchers("/frontend/.*", "/VAADIN/.*", "/login.*", "/accessDenied").permitAll()
.regexMatchers(HttpMethod.POST, "/\\?v-r=.*").permitAll()
// deny any other URL until authenticated
.antMatchers("/**").fullyAuthenticated()
/*
Note that anonymous authentication is enabled by default, therefore;
SecurityContextHolder.getContext().getAuthentication().isAuthenticated() always will return true.
Look at LoginView.beforeEnter method.
more info: https://docs.spring.io/spring-security/site/docs/4.0.x/reference/html/anonymous.html
*/
;
}
@Autowired
public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
auth
.inMemoryAuthentication().passwordEncoder(new BCryptPasswordEncoder())
.withUser("admin").password("$2a$10$obstjyWMAVfsNoKisfyCjO/DNfO9OoMOKNt5a6GRlVS7XNUzYuUbO").roles("ADMIN");// user and pass: admin
}
/**
* Expose the AuthenticationManager (to be used in LoginView)
* @return
* @throws Exception
*/
@Bean(name = BeanIds.AUTHENTICATION_MANAGER)
@Override
public AuthenticationManager authenticationManagerBean() throws Exception {
return super.authenticationManagerBean();
}
}
如您所见，我还没有在我的任何路由视图（使用@Route 注释）上指定任何基于角色的权限。我要做的是，如果我有一个路由视图，我将在构建它（路由视图）时注册一个 BeforeEnterListener，并在那里检查所需的角色/权限。
以下是在导航到 admin-utils 视图之前检查用户是否具有 ADMIN 角色的示例；
@Route(value = "admin-utils")
public class AdminUtilsView extends VerticalLayout {
@Autowired
private HttpServletRequest req;
...
AdminUtilsView() {
...
UI.getCurrent().addBeforeEnterListener(new BeforeEnterListener() {
@Override
public void beforeEnter(BeforeEnterEvent beforeEnterEvent) {
if (beforeEnterEvent.getNavigationTarget() != DeniedAccessView.class && // This is to avoid a
// loop if DeniedAccessView is the target
!req.isUserInRole("ADMIN")) {
beforeEnterEvent.rerouteTo(DeniedAccessView.class);
}
}
});
}
}
如果用户没有 ADMIN 角色，（s）他将被路由到 DeniedAccessView，这在 Spring Security 配置中已经允许所有人使用。
@Route(value = "accessDenied")
public class DeniedAccessView
extends VerticalLayout {
DeniedAccessView() {
FormLayout formLayout = new FormLayout();
formLayout.add(new Label("Access denied!"));
add(formLayout);
}
}
在上面的示例（AdminUtilsView）中，您还可以通过自动装配 HttpServletRequest 在 Vaadin 代码中看到 HttpServletRequest.isUserInRole() 的用例。
总结：如果你的视图有Route，请先使用BeforeEnterListener授权请求，否则使用Spring Security匹配器（例如regexMatchers或antMatchers）进行休息服务等。
注意：对同一规则同时使用 Vaadin Route 和 Spring Security 匹配器规则可能有点扭曲，我不建议这样做（它会导致 Vaadin 中的一些内部循环；例如，假设我们有一个使用 /view 路由的视图和在 Spring Security 中为 /view 输入所需角色。如果用户缺少此类角色并且（s）他被路由/导航到此类页面（使用 Vaadin 路由 API），Vaadin 尝试在 Spring 时打开与该路由关联的视图由于缺少角色，安全性避免了这种情况）。
另外，我认为，在重新路由或将用户导航到不同的视图/上下文之前，使用 Vaadin 流导航 API 的一个好做法是检查所需的角色/权限。
此外，为了有一个在 Vaadin 中使用 AuthenticationManager 的示例，我们可以有一个基于 Vaadin 的 LoginView，类似于：
@Route(value = "login")
public class LoginView
extends FlexLayout implements BeforeEnterObserver {
private final Label label;
private final TextField userNameTextField;
private final PasswordField passwordField;
/**
* AuthenticationManager is already exposed in WebSecurityConfig
*/
@Autowired
private AuthenticationManager authManager;
@Autowired
private HttpServletRequest req;
LoginView() {
label = new Label("Please login...");
userNameTextField = new TextField();
userNameTextField.setPlaceholder("Username");
UiUtils.makeFirstInputTextAutoFocus(Collections.singletonList(userNameTextField));
passwordField = new PasswordField();
passwordField.setPlaceholder("Password");
passwordField.addKeyDownListener(Key.ENTER, (ComponentEventListener<KeyDownEvent>) keyDownEvent -> authenticateAndNavigate());
Button submitButton = new Button("Login");
submitButton.addClickListener((ComponentEventListener<ClickEvent<Button>>) buttonClickEvent -> {
authenticateAndNavigate();
});
FormLayout formLayout = new FormLayout();
formLayout.add(label, userNameTextField, passwordField, submitButton);
add(formLayout);
// center the form
setAlignItems(Alignment.CENTER);
this.getElement().getStyle().set("height", "100%");
this.getElement().getStyle().set("justify-content", "center");
}
private void authenticateAndNavigate() {
/*
Set an authenticated user in Spring Security and Spring MVC
spring-security
*/
UsernamePasswordAuthenticationToken authReq
= new UsernamePasswordAuthenticationToken(userNameTextField.getValue(), passwordField.getValue());
try {
// Set authentication
Authentication auth = authManager.authenticate(authReq);
SecurityContext sc = SecurityContextHolder.getContext();
sc.setAuthentication(auth);
/*
Navigate to the requested page:
This is to redirect a user back to the originally requested URL – after they log in as we are not using
Spring's AuthenticationSuccessHandler.
*/
HttpSession session = req.getSession(false);
DefaultSavedRequest savedRequest = (DefaultSavedRequest) session.getAttribute("SPRING_SECURITY_SAVED_REQUEST");
String requestedURI = savedRequest != null ? savedRequest.getRequestURI() : Application.APP_URL;
this.getUI().ifPresent(ui -> ui.navigate(StringUtils.removeStart(requestedURI, "/")));
} catch (BadCredentialsException e) {
label.setText("Invalid username or password. Please try again.");
}
}
/**
* This is to redirect user to the main URL context if (s)he has already logged in and tries to open /login
*
* @param beforeEnterEvent
*/
@Override
public void beforeEnter(BeforeEnterEvent beforeEnterEvent) {
Authentication auth = SecurityContextHolder.getContext().getAuthentication();
//Anonymous Authentication is enabled in our Spring Security conf
if (auth != null && auth.isAuthenticated() && !(auth instanceof AnonymousAuthenticationToken)) {
//https://vaadin.com/docs/flow/routing/tutorial-routing-lifecycle.html
beforeEnterEvent.rerouteTo("");
}
}
}
最后，这是可以从菜单或按钮调用的注销方法：
/**
* log out the current user using Spring security and Vaadin session management
*/
void requestLogout() {
//https://stackoverflow.com/a/5727444/1572286
SecurityContextHolder.clearContext();
req.getSession(false).invalidate();
// And this is similar to how logout is handled in Vaadin 8:
// https://vaadin.com/docs/v8/framework/articles/HandlingLogout.html
UI.getCurrent().getSession().close();
UI.getCurrent().getPage().reload();// to redirect user to the login page
}
您可以通过查看以下示例继续使用 Spring UserDetailsService 完成角色管理并创建 PasswordEncoder bean：