refactor: 移除不必要的配置依赖，简化上传URL生成逻辑并添加公开访问URL支持

pkg/storage/minio.go

@@ -13,8 +13,9 @@ import (
 
 // StorageClient S3兼容对象存储客户端包装 (支持RustFS、MinIO等)
 type StorageClient struct {
-	client  *minio.Client
-	buckets map[string]string
+	client    *minio.Client
+	buckets   map[string]string
+	publicURL string // 公开访问URL前缀
 }
 
 // NewStorage 创建新的对象存储客户端 (S3兼容，支持RustFS)
@@ -41,9 +42,21 @@ func NewStorage(cfg config.RustFSConfig) (*StorageClient, error) {
 		}
 	}
 
+	// 构建公开访问URL
+	publicURL := cfg.PublicURL
+	if publicURL == "" {
+		// 如果未配置 PublicURL，使用 Endpoint 构建
+		protocol := "http"
+		if cfg.UseSSL {
+			protocol = "https"
+		}
+		publicURL = fmt.Sprintf("%s://%s", protocol, cfg.Endpoint)
+	}
+
 	storageClient := &StorageClient{
-		client:  client,
-		buckets: cfg.Buckets,
+		client:    client,
+		buckets:   cfg.Buckets,
+		publicURL: publicURL,
 	}
 
 	return storageClient, nil
@@ -81,7 +94,7 @@ type PresignedPostPolicyResult struct {
 
 // GeneratePresignedPostURL 生成预签名POST URL (支持表单上传)
 // 注意：使用时必须确保file字段是表单的最后一个字段
-func (s *StorageClient) GeneratePresignedPostURL(ctx context.Context, bucketName, objectName string, minSize, maxSize int64, expires time.Duration, useSSL bool, endpoint string) (*PresignedPostPolicyResult, error) {
+func (s *StorageClient) GeneratePresignedPostURL(ctx context.Context, bucketName, objectName string, minSize, maxSize int64, expires time.Duration) (*PresignedPostPolicyResult, error) {
 	// 创建上传策略
 	policy := minio.NewPostPolicy()
 
@@ -105,12 +118,8 @@ func (s *StorageClient) GeneratePresignedPostURL(ctx context.Context, bucketName
 	// 注意：在Go中直接delete不存在的key是安全的
 	delete(formData, "bucket")
 
-	// 构造文件的永久访问URL
-	protocol := "http"
-	if useSSL {
-		protocol = "https"
-	}
-	fileURL := fmt.Sprintf("%s://%s/%s/%s", protocol, endpoint, bucketName, objectName)
+	// 使用配置的公开访问URL构造文件的永久访问URL
+	fileURL := s.BuildFileURL(bucketName, objectName)
 
 	return &PresignedPostPolicyResult{
 		PostURL:  postURL.String(),
@@ -118,3 +127,13 @@ func (s *StorageClient) GeneratePresignedPostURL(ctx context.Context, bucketName
 		FileURL:  fileURL,
 	}, nil
 }
+
+// BuildFileURL 构建文件的公开访问URL
+func (s *StorageClient) BuildFileURL(bucketName, objectName string) string {
+	return fmt.Sprintf("%s/%s/%s", s.publicURL, bucketName, objectName)
+}
+
+// GetPublicURL 获取公开访问URL前缀
+func (s *StorageClient) GetPublicURL() string {
+	return s.publicURL
+}