自研网关:多项目的swagger聚合功能

星痕

发布于 2020-09-15 09:58:48

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发布于 2020-09-15 09:58:48

文章被收录于专栏：JAVA后端开发

自研网关系统已开源，求star 项目地址

网关地址:https://gitee.com/starmark947618/starmark-gateway

网关一般都会有一个swagger聚合功能，方便于你测试文档接口。但网上的例子，如https://doc.xiaominfo.com/solution/ui-front-gateway.html#%E6%96%87%E6%A1%A3%E8%81%9A%E5%90%88%E4%B8%9A%E5%8A%A1%E7%BC%96%E7%A0%81. 这些例子都能解决swagger聚合的问题，但问题是他只支持一个项目，但我网关肯定会有多个项目，这个怎么处理呢。其实这个原理一样，但说起来也是有几个技术难点的.

doc.html路径问题: swagger默认的文档路径为doc.html或swagger-ui.html,但如果是多项目，即我这个项目，路径需要变成/项目编码/doc.html,这个怎么解决如下,如解决不当，会报404或跨域问题

@Component
public class SwaggerFilter implements WebFilter {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
        //获取工程编码
        String projectCode= RequestHelper.getRequestProjectCode(exchange.getRequest());
        if (StringUtils.isNotEmpty(projectCode)&&projectCode.endsWith(GatewayConstant.STARMARK_SWAGGER)) {
            if (exchange.getRequest().getURI().getPath().contains(projectCode + "/doc.html")) {
                return chain.filter(exchange.mutate().request(exchange.getRequest().mutate().path("/doc.html").build()).build());

            } else if (exchange.getRequest().getURI().getPath().contains(projectCode + "/webjars/")) {
                return chain.filter(exchange.mutate().request(exchange.getRequest().mutate().path(exchange.getRequest().getURI().getPath().replace("/" + projectCode, "")).build()).build());
            }
        }


        return chain.filter(exchange);
    }

}

通过过滤器，将请求转向根请求 2.支持多项目的配置,每个请求都含项目编码,知道属于哪个项目.

@Controller
@RequestMapping()
public class SwaggerHandler {
    @Autowired(required = false)
    private SecurityConfiguration securityConfiguration;
    @Autowired(required = false)
    private UiConfiguration uiConfiguration;
    private final SwaggerProvider swaggerResources;

    @Autowired
    public SwaggerHandler(SwaggerProvider swaggerResources) {
        this.swaggerResources = swaggerResources;
    }


    @GetMapping("/{projectCode}/swagger-resources/configuration/security")
    @ResponseBody
    public Mono<ResponseEntity<SecurityConfiguration>> securityConfiguration(@PathVariable("projectCode") String projectCode) {
        return Mono.just(new ResponseEntity<>(
                Optional.ofNullable(securityConfiguration).orElse(SecurityConfigurationBuilder.builder().build()), HttpStatus.OK));
    }

    @GetMapping("/{projectCode}/swagger-resources/configuration/ui")
    @ResponseBody
    public Mono<ResponseEntity<UiConfiguration>> uiConfiguration(){
        return Mono.just(new ResponseEntity<>(
                Optional.ofNullable(uiConfiguration).orElse(UiConfigurationBuilder.builder().build()), HttpStatus.OK));
    }

    @GetMapping("/{projectCode}/swagger-resources")
    @ResponseBody
    public Mono<ResponseEntity> swaggerResources(@PathVariable("projectCode") String projectCode) {
        return Mono.just((new ResponseEntity<>(swaggerResources.get(projectCode), HttpStatus.OK)));
    }



}

@Component
@Primary
@AllArgsConstructor
public class SwaggerProvider {


    @Autowired
    private IRouteService routeService;

    public List<SwaggerResource> get(String projectCode) {
        //获取真正的projectCode
        String innerProjectCode = projectCode.replace(GatewayConstant.STARMARK_SWAGGER, "");
        List<GatewayAppDto> appDtos = routeService.getGatewayApps(innerProjectCode);

        List<SwaggerResource> resources = appDtos.stream().map(this::swaggerResource).collect(Collectors.toList());
        return resources;
    }

    private SwaggerResource swaggerResource(GatewayAppDto gatewayAppVo) {
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(gatewayAppVo.getAppName());
        swaggerResource.setLocation("/v2/api-docs?swagger_code="+gatewayAppVo.getAppCode());
        swaggerResource.setSwaggerVersion("2.0");
        return swaggerResource;

    }


}

这样，我返回的每个接口地址都含有一个子模块参数swagger_code 3.解决swagger_code参数带来的不显示文档的问题现在其实已经能显示swagger聚合文档，但发现显示不全，文档接口全没有了。经排查，是接口/v2/api-docs不允许有任何参数。解决办法时，网关转发时，使用RemoveRequestParameter把该参数swagger_code去掉示例如下：

  private List<FilterDefinition> createSwaggerFilterDefinition() {
        List<FilterDefinition> filterDefinitions=new ArrayList<>();
        {
            Map<String, String> args = new HashMap<>();
            args.put("name", "swagger_code");
            FilterDefinition filterDefinition = new FilterDefinition();
            filterDefinition.setName("RemoveRequestParameter");
            filterDefinition.setArgs(args);
            filterDefinitions.add(filterDefinition);
        }
        filterDefinitions.add(createFilterDefinition("1"));
        return filterDefinitions;

    }

至此，多项目的网关聚合功能已完成.