chore: import upstream snapshot with attribution

examples/auth/client/main.go

@@ -0,0 +1,83 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+
+	"go-micro.dev/v6"
+	"go-micro.dev/v6/auth"
+	"go-micro.dev/v6/auth/noop"
+	"go-micro.dev/v6/client"
+	authWrapper "go-micro.dev/v6/wrapper/auth"
+
+	pb "go-micro.dev/v6/examples/auth/proto"
+)
+
+func main() {
+	// Get token from environment or generate one
+	token := os.Getenv("TOKEN")
+
+	// Create auth provider (same as server)
+	authProvider := noop.NewAuth()
+
+	// If no token provided, generate one
+	if token == "" {
+		log.Println("No TOKEN env var provided, generating test token...")
+		acc, err := authProvider.Generate("test-user")
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		t, err := authProvider.Token(auth.WithCredentials(acc.ID, acc.Secret))
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		token = t.AccessToken
+		log.Printf("Generated token: %s\n", token)
+	}
+
+	// Create service with auth client wrapper
+	service := micro.NewService("greeter.client", micro.WrapClient(
+		authWrapper.FromToken(token), // Add token to all requests
+	),
+	)
+
+	service.Init()
+
+	// Create greeter client
+	greeterClient := pb.NewGreeterService("greeter", service.Client())
+
+	// Test 1: Call protected endpoint (Hello) with auth
+	fmt.Println("\n=== Test 1: Protected endpoint WITH auth ===")
+	rsp, err := greeterClient.Hello(context.Background(), &pb.Request{Name: "John"})
+	if err != nil {
+		log.Printf("Error: %v", err)
+	} else {
+		fmt.Printf("Response: %s\n", rsp.Msg)
+	}
+
+	// Test 2: Call public endpoint (Health) without auth
+	fmt.Println("\n=== Test 2: Public endpoint (no auth needed) ===")
+	// Create client without auth wrapper for this test
+	plainClient := client.NewClient()
+	plainGreeterClient := pb.NewGreeterService("greeter", plainClient)
+
+	healthRsp, err := plainGreeterClient.Health(context.Background(), &pb.HealthRequest{})
+	if err != nil {
+		log.Printf("Error: %v", err)
+	} else {
+		fmt.Printf("Health Status: %s\n", healthRsp.Status)
+	}
+
+	// Test 3: Call protected endpoint WITHOUT auth (should fail)
+	fmt.Println("\n=== Test 3: Protected endpoint WITHOUT auth (should fail) ===")
+	_, err = plainGreeterClient.Hello(context.Background(), &pb.Request{Name: "John"})
+	if err != nil {
+		fmt.Printf("Expected error: %v\n", err)
+	} else {
+		fmt.Println("Unexpected: Call succeeded without auth!")
+	}
+}