Spring Cloud Gateway

casdoor-springcloud-gateway-example是一个示例，说明如何在Spring Cloud Gateway中使用casdoor-spring-boot-starter作为OAuth2插件。以下是使用它的步骤描述。

步骤1：部署Casdoor

以生产模式部署 Casdoor。见服务器安装。确认服务器可以访问，并且能在登录页登录（例如 admin / 123）。

步骤2：初始化一个Spring Cloud Gateway

示例代码可以直接用，也可以按你的应用修改。

您需要一个网关服务和至少一个业务服务。在这个例子中，casdoor-gateway 是网关服务，casdoor-api 是业务服务。

步骤3：包含依赖项

将 casdoor-spring-boot-starter 依赖项添加到您的 Spring Cloud Gateway 项目中。

对于Apache Maven：

/casdoor-gateway/pom.xml
<!-- https://mvnrepository.com/artifact/org.casbin/casdoor-spring-boot-starter -->
<dependency>
    <groupId>org.casbin</groupId>
    <artifactId>casdoor-spring-boot-starter</artifactId>
    <version>1.x.y</version>
</dependency>

对于Gradle：

// https://mvnrepository.com/artifact/org.casbin/casdoor-spring-boot-starter
implementation group: 'org.casbin', name: 'casdoor-spring-boot-starter', version: '1.x.y'

步骤4：配置您的属性

初始化需要6个参数，所有这些参数都是字符串类型。

名称(按顺序排列)	需要	描述
endpoint	是	Casdoor 服务器 URL，例如 `http://localhost:8000`
clientId	是	Application.client_id
clientSecret	是	Application.client_secret
certificate	是	Application.certificate
organizationName	是	Application.organization
applicationName	否	Application.name

通过 Java properties 或 YAML 初始化这些参数。

对于属性：

casdoor.endpoint=http://localhost:8000
casdoor.clientId=<client-id>
casdoor.clientSecret=<client-secret>
casdoor.certificate=<certificate>
casdoor.organizationName=built-in
casdoor.applicationName=app-built-in

对于YAML：

casdoor:
  endpoint: http://localhost:8000
  client-id: <client-id>
  client-secret: <client-secret>
  certificate: <certificate>
  organization-name: built-in
  application-name: app-built-in

同时配置网关路由。对于YAML：

spring:
  application:
    name: casdoor-gateway
  cloud:
    gateway:
      routes:
        - id: api-route
          uri: http://localhost:9091
          predicates:
            - Path=/api/**

步骤5：添加CasdoorAuthFilter

在网关中添加GlobalFilter接口的实现类，用于身份验证，例如本例中使用的CasdoorAuthFilter。

如果身份验证失败，它将返回401状态码给前端，以重定向他们到登录界面。

@Component
public class CasdoorAuthFilter implements GlobalFilter, Ordered {

    private static final Logger LOGGER = LoggerFactory.getLogger(CasdoorAuthFilter.class);

    @Override public int getOrder() {
        return 0;
    }

    @Override public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        return exchange.getSession().flatMap(webSession -> {
            CasdoorUser user = webSession.getAttribute("casdoorUser");
            if (user != null) {
                return chain.filter(exchange);
            }
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            response.getHeaders().add("Content-Type", "application/json");
            return response.setComplete();
        });
    }
}

步骤6：获取服务并使用它

现在提供5项服务：CasdoorAuthService，CasdoorUserService，CasdoorEmailService，CasdoorSmsService，以及CasdoorResourceService。

在 Gateway 项目中按如下方式创建它们。

@Resource
private CasdoorAuthService casdoorAuthService;

当应用需要认证时，带上目标地址跳转到 Casdoor 登录页。

提前把回调地址（例如 http://localhost:9090/callback）加到 Casdoor 应用中。

@RequestMapping("login")
public Mono<String> login() {
    return Mono.just("redirect:" + casdoorAuthService.getSigninUrl("http://localhost:9090/callback"));
}

Casdoor 验证用户后，会带着 code 和 state 跳回应用；用 code 和 getOAuthToken 获取 JWT。

CasdoorUser 保存来自 Casdoor 的用户信息，用它在你的应用中建立会话。

@RequestMapping("callback")
public Mono<String> callback(String code, String state, ServerWebExchange exchange) {
    String token = "";
    CasdoorUser user = null;
    try {
        token = casdoorAuthService.getOAuthToken(code, state);
        user = casdoorAuthService.parseJwtToken(token);
    } catch(CasdoorAuthException e) {
        e.printStackTrace();
    }
    CasdoorUser finalUser = user;
    return exchange.getSession().flatMap(session -> {
        session.getAttributes().put("casdoorUser", finalUser);
        return Mono.just("redirect:/");
    });
}

以下是API的示例。

CasdoorAuthService
- String token = casdoorAuthService.getOAuthToken(code, "app-built-in");
- CasdoorUser casdoorUser = casdoorAuthService.parseJwtToken(token);
CasdoorUserService
- CasdoorUser casdoorUser = casdoorUserService.getUser("admin");
- CasdoorUser casdoorUser = casdoorUserService.getUserByEmail("admin@example.com");
- CasdoorUser[] casdoorUsers = casdoorUserService.getUsers();
- CasdoorUser[] casdoorUsers = casdoorUserService.getSortedUsers("created_time", 5);
- int count = casdoorUserService.getUserCount("0");
- CasdoorResponse response = casdoorUserService.addUser(user);
- CasdoorResponse response = casdoorUserService.updateUser(user);
- CasdoorResponse response = casdoorUserService.deleteUser(user);
CasdoorEmailService
- CasdoorResponse response = casdoorEmailService.sendEmail(title, content, sender, receiver);
CasdoorSmsService
- CasdoorResponse response = casdoorSmsService.sendSms(randomCode(), receiver);
CasdoorResourceService
- CasdoorResponse response = casdoorResourceService.uploadResource(user, tag, parent, fullFilePath, file);
- CasdoorResponse response = casdoorResourceService.deleteResource(file.getName());