84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
package middleware
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import (
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"net/http"
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"strings"
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"github.com/gin-gonic/gin"
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"github.com/golang-jwt/jwt/v5"
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)
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// 上下文键名常量，用于在 gin.Context 中存取鉴权后的用户信息
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const (
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ContextUserID = "user_id"
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ContextRole = "role"
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)
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// Claims JWT 自定义声明结构，嵌入标准声明
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type Claims struct {
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UserID uint `json:"user_id"`
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Role string `json:"role"`
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jwt.RegisteredClaims
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}
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// JWTAuth JWT 鉴权中间件，校验 Bearer Token 并将用户信息写入上下文
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func JWTAuth(secret string) gin.HandlerFunc {
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return func(c *gin.Context) {
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authHeader := c.GetHeader("Authorization")
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if authHeader == "" {
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c.JSON(http.StatusUnauthorized, gin.H{"code": 1, "message": "缺少认证信息", "data": nil})
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c.Abort()
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return
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}
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// 提取 Bearer <token> 中的 token 部分
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parts := strings.SplitN(authHeader, " ", 2)
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if len(parts) != 2 || !strings.EqualFold(parts[0], "Bearer") {
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c.JSON(http.StatusUnauthorized, gin.H{"code": 1, "message": "认证格式错误", "data": nil})
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c.Abort()
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return
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}
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tokenString := strings.TrimSpace(parts[1])
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// 解析并校验 token，同时确认签名算法为 HMAC
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claims := &Claims{}
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token, err := jwt.ParseWithClaims(tokenString, claims, func(t *jwt.Token) (interface{}, error) {
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if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, jwt.ErrTokenSignatureInvalid
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}
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return []byte(secret), nil
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})
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if err != nil || !token.Valid {
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c.JSON(http.StatusUnauthorized, gin.H{"code": 1, "message": "无效或过期的令牌", "data": nil})
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c.Abort()
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return
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}
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// 鉴权成功，将用户信息写入上下文供后续 handler 使用
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c.Set(ContextUserID, claims.UserID)
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c.Set(ContextRole, claims.Role)
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c.Next()
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}
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}
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// GetUserID 从上下文获取用户 ID，未取到时返回 0
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func GetUserID(c *gin.Context) uint {
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if v, exists := c.Get(ContextUserID); exists {
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if uid, ok := v.(uint); ok {
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return uid
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}
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}
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return 0
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}
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// GetRole 从上下文获取用户角色，未取到时返回空字符串
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func GetRole(c *gin.Context) string {
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if v, exists := c.Get(ContextRole); exists {
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if role, ok := v.(string); ok {
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return role
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}
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}
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return ""
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}
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