Spring Cloud Gateway、Swagger、Nginx整合

1. test 服务中已配置分组
   
2. 配置网关
   1. pom 添加依赖

      <dependency>
          <groupId>io.springfoxgroupId>
          <artifactId>springfox-swagger2artifactId>
          <version>2.9.2version>
          <scope>compilescope>
      dependency>
      <dependency>
          <groupId>io.springfoxgroupId>
          <artifactId>springfox-swagger-uiartifactId>
          <version>2.9.2version>
      dependency>
      

   2. 注入路由到 SwaggerResource

      @Component
      @Primary
      public class SwaggerProvider implements SwaggerResourcesProvider {
      
          public static final String API_URI = "/v2/api-docs";
          private RouteLocator routeLocator;
          private GatewayProperties gatewayProperties;
      
      
          @Override
          public List<SwaggerResource> get() {
              List<SwaggerResource> resources = new ArrayList<>();
              List<String> routes = new ArrayList<>();
              //取出gateway的route
              routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
              //结合配置的route-路径(Path)，和route过滤，只获取有效的route节点
              gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId()))
                      .forEach(routeDefinition -> routeDefinition.getPredicates().stream()
                              .filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
                              .forEach(predicateDefinition -> {
                                  // FIXME 能力有限想不出更好的实现方法来整合单个服务的分组问题
                                  String name = routeDefinition.getId();
                                  // name为服务名
                                  if ("test".equals(name)) {
                                      String location = predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0")
                                              .replace("/**", API_URI);
                                      resources.add(swaggerResource(name + "/test1", location + "?group=test1"));
                                      resources.add(swaggerResource(name + "/test2", location + "?group=test2"));
                                      return;
                                  }
                                  resources.add(swaggerResource(name,
                                      predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0")
                                              .replace("/**", API_URI)));
                              }));
              return resources;
          }
      
          private SwaggerResource swaggerResource(String name, String location) {
              SwaggerResource swaggerResource = new SwaggerResource();
              swaggerResource.setName(name);
              swaggerResource.setLocation(location);
              swaggerResource.setSwaggerVersion("2.0");
              return swaggerResource;
          }
      
          @Autowired
          public SwaggerProvider(RouteLocator routeLocator, GatewayProperties gatewayProperties) {
              this.routeLocator = routeLocator;
              this.gatewayProperties = gatewayProperties;
          }
      

   3. 提供 Swagger 对外接口

      @RestController
      @RequestMapping("/swagger-resources")
      public class SwaggerController {
      
          @Autowired(required = false)
          private SecurityConfiguration securityConfiguration;
          @Autowired(required = false)
          private UiConfiguration uiConfiguration;
          private final SwaggerResourcesProvider swaggerResources;
      
      
          @GetMapping("/configuration/security")
          public Mono<ResponseEntity<SecurityConfiguration>> securityConfiguration() {
              return Mono.just(new ResponseEntity<>(
                      Optional.ofNullable(securityConfiguration).orElse(SecurityConfigurationBuilder.builder().build()), HttpStatus.OK));
          }
      
          @GetMapping("/configuration/ui")
          public Mono<ResponseEntity<UiConfiguration>> uiConfiguration() {
              return Mono.just(new ResponseEntity<>(
                      Optional.ofNullable(uiConfiguration).orElse(UiConfigurationBuilder.builder().build()), HttpStatus.OK));
          }
      
          @GetMapping
          public Mono<ResponseEntity> swaggerResources() {
              return Mono.just((new ResponseEntity<>(swaggerResources.get(), HttpStatus.OK)));
          }
      
          @Autowired
          public SwaggerController(SwaggerResourcesProvider swaggerResources) {
              this.swaggerResources = swaggerResources;
          }
      
      }
      

   4. Swagger 路径转换

      通过以上配置，可以实现文档的参考和展示了，但是使用 Swagger 的 try it out 功能发现路径是路由切割后的路径比如：
      Swagger 文档中的路径为：
      主机名：端口：映射路径 少了一个 服务路由前缀，是因为展示 handler 经过了 StripPrefixGatewayFilterFactory 这个过滤器的处理，原有的 路由前缀被过滤掉了！

      1. 方案1：通过 Swagger 的 host 配置手动维护一个前缀

         return new Docket(DocumentationType.SWAGGER_2)
             .apiInfo(apiInfo())
             .host("主机名：端口：服务前缀")  //注意这里的主机名：端口是网关的地址和端口
             .select()
             .apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))
             .paths(PathSelectors.any())
             .build()
             .globalOperationParameters(parameterList);
         

      2. 方案2：增加 X-Forwarded-Prefix

         @Component
         public class SwaggerHeaderFilter extends AbstractGatewayFilterFactory {
             private static final String HEADER_NAME = "X-Forwarded-Prefix";
         
             @Override
             public GatewayFilter apply(Object config) {
                 return (exchange, chain) -> {
                     ServerHttpRequest request = exchange.getRequest();
                     String path = request.getURI().getPath();
                     if (!StringUtils.endsWithIgnoreCase(path, SwaggerProvider.API_URI)) {
                         return chain.filter(exchange);
                     }
         
                     String basePath = path.substring(0, path.lastIndexOf(SwaggerProvider.API_URI));
         
         
                     ServerHttpRequest newRequest = request.mutate().header(HEADER_NAME, basePath).build();
                     ServerWebExchange newExchange = exchange.mutate().request(newRequest).build();
                     return chain.filter(newExchange);
                 };
             }
         }
         

         配置 appction.yml

         - id: test
           uri: lb://test
           predicates:
           - Path=/test/**
           filters:
           - SwaggerHeaderFilter
           - StripPrefix=1
         

3. Nginx 配置
   1. Nginx 配置文件

      	# 配置使用用户名和密码登录
      	location /swagger-ui.html {
              auth_basic "test";
              # 相对路径：htpasswd在机器上的位置：/usr/local/nginx/conf/htpasswd
              auth_basic_user_file htpasswd;
              # 绝对路径：htpasswd在机器上的位置：/tmp/htpasswd
              # auth_basic_user_file /tmp/htpasswd;
          	proxy_pass http://zxjl/swagger-ui.html;
          }
      
          location /swagger-resources {
          	proxy_pass http://zxjl/swagger-resources;
          }
      
          location /webjars {
          	proxy_pass http://zxjl/webjars;
          }
      

   2. 创建 htpasswd

      # 格式：用户名:密码，注意密码是使用crypt加密过的
      admin:PbSRr7orsxaso
      

参考：Spring Cloud Gateway 聚合swagger文档
nginx配置指令auth_basic、auth_basic_user_file及相关知识