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backend/middleware/auth.go

@@ -0,0 +1,100 @@
+package middleware
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/freefire/jiang13-bbs/service"
+	"github.com/gin-gonic/gin"
+)
+
+// AuthMiddleware 认证中间件
+type AuthMiddleware struct {
+	auth *service.AuthService
+}
+
+func NewAuthMiddleware(auth *service.AuthService) *AuthMiddleware {
+	return &AuthMiddleware{auth: auth}
+}
+
+// OptionalAuth 可选登录：解析 token，失败不阻断
+func (m *AuthMiddleware) OptionalAuth() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		user, ok := m.parseToken(c)
+		if ok {
+			c.Set("user", user)
+		}
+		c.Next()
+	}
+}
+
+// RequireAuth 必须登录
+func (m *AuthMiddleware) RequireAuth() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		user, ok := m.parseToken(c)
+		if !ok {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "未登录"})
+			return
+		}
+		if user.Banned {
+			c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"error": "账号已被封禁"})
+			return
+		}
+		c.Set("user", user)
+		c.Next()
+	}
+}
+
+// RequireAdmin 必须管理员
+func (m *AuthMiddleware) RequireAdmin() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		user, ok := m.parseToken(c)
+		if !ok {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "未登录"})
+			return
+		}
+		if user.Role != service.RoleAdmin {
+			c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"error": "需要管理员权限"})
+			return
+		}
+		c.Set("user", user)
+		c.Next()
+	}
+}
+
+// parseToken 解析并校验 token：
+// 1. 优先从 HttpOnly cookie 读取，回退 Authorization header
+// 2. 校验 JWT 签名和过期
+// 3. 查 DB 实时校验 token_version 和 banned 状态
+func (m *AuthMiddleware) parseToken(c *gin.Context) (*service.UserClaims, bool) {
+	tokenStr, err := c.Cookie(service.CookieName)
+	if err != nil || tokenStr == "" {
+		auth := c.GetHeader("Authorization")
+		if auth == "" {
+			return nil, false
+		}
+		tokenStr = strings.TrimPrefix(auth, "Bearer ")
+		if tokenStr == auth {
+			return nil, false
+		}
+	}
+	claims, err := m.auth.ParseToken(tokenStr)
+	if err != nil {
+		return nil, false
+	}
+	// 实时校验：token_version 匹配 + 未封禁（防止旧 JWT 在封禁/改密码后仍有效）
+	if _, err := m.auth.ValidateClaims(claims); err != nil {
+		return nil, false
+	}
+	return claims, true
+}
+
+// CurrentUser 从 context 获取当前用户
+func CurrentUser(c *gin.Context) *service.UserClaims {
+	if v, ok := c.Get("user"); ok {
+		if u, ok := v.(*service.UserClaims); ok {
+			return u
+		}
+	}
+	return nil
+}