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本文是go-zero开发入门-API网关开发示例一文的延伸，继续之前请先阅读此文。
在项目根目录下创建子目录 middleware，在此目录下创建文件 auth.go，内容如下：
// 鉴权中间件
package middlewareimport ("context""errors""net/http"
)var ErrInvalidToken = errors.New("invalid token")func AuthMiddleware(next http.HandlerFunc) http.HandlerFunc {return func(w http.ResponseWriter, r *http.Request) {token := r.Header.Get("Authorization")// 调用登录服务接口生成鉴权信息// 这里只是一个示例，实际需替换为实际的登录服务调用if token != "valid-token" {w.Write([]byte("invalid token"))return}// 将鉴权信息添加到请求上下文中ctx := context.WithValue(r.Context(), "token", token)next.ServeHTTP(w, r.WithContext(ctx))}
}
在网关 main.go 文件中加入鉴权中间件：
package mainimport ("flag""fmt""gateway/middleware""github.com/zeromicro/go-zero/core/conf""github.com/zeromicro/go-zero/gateway"
)var configFile = flag.String("f", "etc/gateway.yaml", "the config file")func main() {var c gateway.GatewayConfflag.Parse()conf.MustLoad(*configFile, &c)server := gateway.MustNewServer(c)server.Use(middleware.AuthMiddleware) // 使用 server 的 Use() 方法添加全局中间件defer server.Stop()fmt.Printf("Starting server at %s:%d...\n", c.Host, c.Port)server.Start()
}
在网关的配置文件 etc/gateway.yaml 中加入鉴权：
Name: go-zero-gateway
Host: 0.0.0.0
Port: 9999
Upstreams:- Grpc:Etcd:Hosts:- 127.0.0.1:2379Key: add.rpcProtoSets:- /root/go-zero/gateway/proto/add.pbMappings: # Mappings can also be written in proto options- Method: getPath: /addRpcPath: add.Adder/addHeaders: - Authorization
编译生成网关可执行程序文件：
# cat Makefile
all: gateway
gateway: main.gogo build -o gateway main.go clean:rm -f gatewayrpc:goctl gateway -dir gateway
启动网关：
./gateway
请求网关：
# curl -i '127.0.0.1:9999/add?a=1&b=2'
HTTP/1.1 200 OK
Traceparent: 00-1cd6f9f8c902193d8dd7da646f775d0d-4959382686bbb075-00
Date: Sun, 10 Dec 2023 12:04:40 GMT
Content-Length: 13
Content-Type: text/plain; charset=utf-8invalid token