138 lines
3.5 KiB
Go
138 lines
3.5 KiB
Go
package storage
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import (
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"fmt"
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"io"
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"net/http"
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"os"
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"path/filepath"
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"strings"
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"time"
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)
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type LocalStorage struct {
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basePath string
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baseURL string
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}
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func NewLocalStorage(basePath, baseURL string) (*LocalStorage, error) {
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if err := os.MkdirAll(basePath, 0755); err != nil {
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return nil, fmt.Errorf("failed to create storage directory: %w", err)
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}
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return &LocalStorage{
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basePath: basePath,
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baseURL: baseURL,
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}, nil
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}
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func (s *LocalStorage) Upload(file io.Reader, filename string, category string) (string, error) {
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dir := filepath.Join(s.basePath, category)
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if err := os.MkdirAll(dir, 0755); err != nil {
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return "", fmt.Errorf("failed to create category directory: %w", err)
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}
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timestamp := time.Now().Format("20060102_150405")
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newFilename := fmt.Sprintf("%s_%s", timestamp, filename)
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filePath := filepath.Join(dir, newFilename)
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dst, err := os.Create(filePath)
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if err != nil {
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return "", fmt.Errorf("failed to create file: %w", err)
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}
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defer dst.Close()
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if _, err := io.Copy(dst, file); err != nil {
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return "", fmt.Errorf("failed to save file: %w", err)
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}
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url := fmt.Sprintf("%s/%s/%s", s.baseURL, category, newFilename)
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return url, nil
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}
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func (s *LocalStorage) Delete(url string) error {
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return nil
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}
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func (s *LocalStorage) GetURL(path string) string {
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return fmt.Sprintf("%s/%s", s.baseURL, path)
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}
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// DownloadFromURL 从远程URL下载文件到本地存储
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func (s *LocalStorage) DownloadFromURL(url, category string) (string, error) {
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// 发送HTTP请求下载文件
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resp, err := http.Get(url)
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if err != nil {
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return "", fmt.Errorf("failed to download file: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return "", fmt.Errorf("failed to download file: HTTP %d", resp.StatusCode)
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}
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// 从URL或Content-Type推断文件扩展名
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ext := getFileExtension(url, resp.Header.Get("Content-Type"))
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// 创建目录
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dir := filepath.Join(s.basePath, category)
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if err := os.MkdirAll(dir, 0755); err != nil {
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return "", fmt.Errorf("failed to create category directory: %w", err)
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}
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// 生成唯一文件名
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timestamp := time.Now().Format("20060102_150405_000")
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filename := fmt.Sprintf("%s%s", timestamp, ext)
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filePath := filepath.Join(dir, filename)
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// 保存文件
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dst, err := os.Create(filePath)
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if err != nil {
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return "", fmt.Errorf("failed to create file: %w", err)
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}
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defer dst.Close()
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if _, err := io.Copy(dst, resp.Body); err != nil {
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return "", fmt.Errorf("failed to save file: %w", err)
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}
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// 返回本地URL
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localURL := fmt.Sprintf("%s/%s/%s", s.baseURL, category, filename)
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return localURL, nil
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}
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// getFileExtension 从URL或Content-Type推断文件扩展名
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func getFileExtension(url, contentType string) string {
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// 首先尝试从URL获取扩展名
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if idx := strings.LastIndex(url, "."); idx != -1 {
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ext := url[idx:]
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// 只取扩展名部分，忽略查询参数
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if qIdx := strings.Index(ext, "?"); qIdx != -1 {
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ext = ext[:qIdx]
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}
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if len(ext) <= 5 { // 合理的扩展名长度
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return ext
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}
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}
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// 根据Content-Type推断扩展名
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switch {
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case strings.Contains(contentType, "image/jpeg"):
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return ".jpg"
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case strings.Contains(contentType, "image/png"):
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return ".png"
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case strings.Contains(contentType, "image/gif"):
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return ".gif"
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case strings.Contains(contentType, "image/webp"):
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return ".webp"
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case strings.Contains(contentType, "video/mp4"):
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return ".mp4"
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case strings.Contains(contentType, "video/webm"):
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return ".webm"
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case strings.Contains(contentType, "video/quicktime"):
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return ".mov"
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default:
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return ".bin"
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}
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}
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