go语言实现简单认证样例

1、代码实现样例

2、postman调用

1、代码实现样例

package main

import (
	"net/http"
	"strings"

	"github.com/dgrijalva/jwt-go"
	"github.com/gin-gonic/gin"
)

var (
	// 密钥，用于验证 JWT 令牌
	signingKey = []byte("secret")
)

// AuthMiddleware 是一个 Gin 中间件函数，用于验证 JWT 令牌
func AuthMiddleware() gin.HandlerFunc {
	return func(c *gin.Context) {
		authHeader := c.GetHeader("Authorization")
		if authHeader == "" {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Missing Authorization header"})
			c.Abort()
			return
		}

		// 从 Authorization 头部提取令牌
		parts := strings.Split(authHeader, " ")
		if len(parts) != 2 || parts[0] != "Bearer" {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid Authorization header format"})
			c.Abort()
			return
		}
		tokenString := parts[1]

		// 解析令牌
		token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
			return signingKey, nil
		})
		if err != nil {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Failed to parse token"})
			c.Abort()
			return
		}

		// 验证令牌
		if !token.Valid {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid token"})
			c.Abort()
			return
		}

		// 将用户信息保存到上下文中
		if claims, ok := token.Claims.(jwt.MapClaims); ok {
			c.Set("username", claims["username"])
			c.Next()
		} else {
			c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid token claims"})
			c.Abort()
			return
		}
	}
}

func main() {
	r := gin.Default()

	// 使用中间件进行认证
	r.Use(AuthMiddleware())

	// 受保护的路由，需要认证通过才能访问
	r.GET("/protected", func(c *gin.Context) {
		username, _ := c.Get("username")
		c.JSON(http.StatusOK, gin.H{"message": "Hello, " + username.(string)})
	})

	// 启动服务
	r.Run(":8080")
}