first commit

internal/middleware/auth_admin.go

@@ -0,0 +1,43 @@
+package middleware
+
+import (
+	"strings"
+
+	"github.com/gin-gonic/gin"
+
+	"portal-mini-go/internal/pkg/errors"
+	"portal-mini-go/internal/pkg/token"
+)
+
+const adminIDCtxKey = "admin_id"
+
+// AdminAuth 校验后台请求的 Bearer JWT，校验通过后将 admin_id 注入 context。
+func AdminAuth(jwtSecret string) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		auth := c.GetHeader("Authorization")
+		const prefix = "Bearer "
+		if !strings.HasPrefix(auth, prefix) {
+			c.Error(errors.ErrUnauthorized)
+			c.Abort()
+			return
+		}
+		claims, err := token.Parse(jwtSecret, strings.TrimPrefix(auth, prefix))
+		if err != nil {
+			c.Error(errors.ErrUnauthorized)
+			c.Abort()
+			return
+		}
+		c.Set(adminIDCtxKey, claims.AdminID)
+		c.Next()
+	}
+}
+
+// AdminID 从 gin.Context 取出已认证的后台管理员 ID。
+func AdminID(c *gin.Context) string {
+	if v, ok := c.Get(adminIDCtxKey); ok {
+		if s, ok := v.(string); ok {
+			return s
+		}
+	}
+	return ""
+}