初始化

internal/middleware/auth.go

@@ -0,0 +1,21 @@
+package middleware
+
+import (
+	"crypto/subtle"
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+// RequireAPIKey 校验 Authorization: Bearer <api_key>（常数时间比较），不匹配返回 401。
+func RequireAPIKey(key string) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		token := strings.TrimSpace(strings.TrimPrefix(c.GetHeader("Authorization"), "Bearer "))
+		if key == "" || subtle.ConstantTimeCompare([]byte(token), []byte(key)) != 1 {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "UNAUTHORIZED"})
+			return
+		}
+		c.Next()
+	}
+}