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package local
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"net/url"
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"os"
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"path/filepath"
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model "github.com/cloudreve/Cloudreve/v3/models"
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"github.com/cloudreve/Cloudreve/v3/pkg/auth"
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"github.com/cloudreve/Cloudreve/v3/pkg/cache"
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"github.com/cloudreve/Cloudreve/v3/pkg/filesystem/fsctx"
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"github.com/cloudreve/Cloudreve/v3/pkg/filesystem/response"
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"github.com/cloudreve/Cloudreve/v3/pkg/serializer"
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"github.com/cloudreve/Cloudreve/v3/pkg/util"
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)
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const (
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Perm = 0744
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)
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// Driver 本地策略适配器
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type Driver struct {
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Policy *model.Policy
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}
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// List 递归列取给定物理路径下所有文件
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func (handler Driver) List(ctx context.Context, path string, recursive bool) ([]response.Object, error) {
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var res []response.Object
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// 取得起始路径
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root := util.RelativePath(filepath.FromSlash(path))
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// 开始遍历路径下的文件、目录
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err := filepath.Walk(root,
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func(path string, info os.FileInfo, err error) error {
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// 跳过根目录
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if path == root {
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return nil
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}
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if err != nil {
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util.Log().Warning("无法遍历目录 %s, %s", path, err)
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return filepath.SkipDir
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}
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// 将遍历对象的绝对路径转换为相对路径
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rel, err := filepath.Rel(root, path)
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if err != nil {
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return err
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}
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res = append(res, response.Object{
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Name: info.Name(),
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RelativePath: filepath.ToSlash(rel),
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Source: path,
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Size: uint64(info.Size()),
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IsDir: info.IsDir(),
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LastModify: info.ModTime(),
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})
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// 如果非递归，则不步入目录
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if !recursive && info.IsDir() {
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return filepath.SkipDir
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}
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return nil
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})
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return res, err
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}
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// Get 获取文件内容
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func (handler Driver) Get(ctx context.Context, path string) (response.RSCloser, error) {
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// 打开文件
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file, err := os.Open(util.RelativePath(path))
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if err != nil {
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util.Log().Debug("无法打开文件：%s", err)
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return nil, err
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}
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return file, nil
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}
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// Put 将文件流保存到指定目录
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func (handler Driver) Put(ctx context.Context, file fsctx.FileHeader) error {
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defer file.Close()
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fileInfo := file.Info()
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dst := util.RelativePath(filepath.FromSlash(fileInfo.SavePath))
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// 如果非 Overwrite，则检查是否有重名冲突
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if fileInfo.Mode&fsctx.Overwrite != fsctx.Overwrite {
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if util.Exists(dst) {
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util.Log().Warning("物理同名文件已存在或不可用: %s", dst)
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return errors.New("物理同名文件已存在或不可用")
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}
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}
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// 如果目标目录不存在，创建
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basePath := filepath.Dir(dst)
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if !util.Exists(basePath) {
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err := os.MkdirAll(basePath, Perm)
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if err != nil {
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util.Log().Warning("无法创建目录，%s", err)
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return err
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}
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}
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var (
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out *os.File
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err error
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)
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openMode := os.O_CREATE | os.O_RDWR
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if fileInfo.Mode&fsctx.Append == fsctx.Append {
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openMode |= os.O_APPEND
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} else {
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openMode |= os.O_TRUNC
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}
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out, err = os.OpenFile(dst, openMode, Perm)
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if err != nil {
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util.Log().Warning("无法打开或创建文件，%s", err)
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return err
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}
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defer out.Close()
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if fileInfo.Mode&fsctx.Append == fsctx.Append {
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stat, err := out.Stat()
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if err != nil {
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util.Log().Warning("无法读取文件信息，%s", err)
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return err
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}
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if uint64(stat.Size()) < fileInfo.AppendStart {
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return errors.New("未上传完成的文件分片与预期大小不一致")
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} else if uint64(stat.Size()) > fileInfo.AppendStart {
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out.Close()
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if err := handler.Truncate(ctx, dst, fileInfo.AppendStart); err != nil {
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return fmt.Errorf("覆盖分片时发生错误: %w", err)
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}
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out, err = os.OpenFile(dst, openMode, Perm)
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defer out.Close()
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if err != nil {
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util.Log().Warning("无法打开或创建文件，%s", err)
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return err
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}
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}
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}
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// 写入文件内容
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_, err = io.Copy(out, file)
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return err
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}
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func (handler Driver) Truncate(ctx context.Context, src string, size uint64) error {
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util.Log().Warning("截断文件 [%s] 至 [%d]", src, size)
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out, err := os.OpenFile(src, os.O_WRONLY, Perm)
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if err != nil {
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util.Log().Warning("无法打开文件，%s", err)
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return err
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}
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defer out.Close()
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return out.Truncate(int64(size))
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}
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// Delete 删除一个或多个文件，
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// 返回未删除的文件，及遇到的最后一个错误
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func (handler Driver) Delete(ctx context.Context, files []string) ([]string, error) {
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deleteFailed := make([]string, 0, len(files))
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var retErr error
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for _, value := range files {
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filePath := util.RelativePath(filepath.FromSlash(value))
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if util.Exists(filePath) {
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err := os.Remove(filePath)
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if err != nil {
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util.Log().Warning("无法删除文件，%s", err)
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retErr = err
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deleteFailed = append(deleteFailed, value)
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}
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}
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// 尝试删除文件的缩略图（如果有）
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_ = os.Remove(util.RelativePath(value + model.GetSettingByNameWithDefault("thumb_file_suffix", "._thumb")))
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}
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return deleteFailed, retErr
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}
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// Thumb 获取文件缩略图
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func (handler Driver) Thumb(ctx context.Context, path string) (*response.ContentResponse, error) {
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file, err := handler.Get(ctx, path+model.GetSettingByNameWithDefault("thumb_file_suffix", "._thumb"))
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if err != nil {
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return nil, err
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}
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return &response.ContentResponse{
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Redirect: false,
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Content: file,
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}, nil
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}
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// Source 获取外链URL
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func (handler Driver) Source(
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ctx context.Context,
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path string,
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baseURL url.URL,
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ttl int64,
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isDownload bool,
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speed int,
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) (string, error) {
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file, ok := ctx.Value(fsctx.FileModelCtx).(model.File)
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if !ok {
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return "", errors.New("无法获取文件记录上下文")
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}
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// 是否启用了CDN
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if handler.Policy.BaseURL != "" {
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cdnURL, err := url.Parse(handler.Policy.BaseURL)
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if err != nil {
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return "", err
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}
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baseURL = *cdnURL
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}
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var (
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signedURI *url.URL
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err error
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)
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if isDownload {
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// 创建下载会话，将文件信息写入缓存
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downloadSessionID := util.RandStringRunes(16)
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err = cache.Set("download_"+downloadSessionID, file, int(ttl))
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if err != nil {
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return "", serializer.NewError(serializer.CodeCacheOperation, "无法创建下载会话", err)
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}
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// 签名生成文件记录
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signedURI, err = auth.SignURI(
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auth.General,
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fmt.Sprintf("/api/v3/file/download/%s", downloadSessionID),
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ttl,
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)
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} else {
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// 签名生成文件记录
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signedURI, err = auth.SignURI(
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auth.General,
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fmt.Sprintf("/api/v3/file/get/%d/%s", file.ID, file.Name),
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ttl,
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)
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}
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if err != nil {
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return "", serializer.NewError(serializer.CodeEncryptError, "无法对URL进行签名", err)
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}
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finalURL := baseURL.ResolveReference(signedURI).String()
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return finalURL, nil
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}
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// Token 获取上传策略和认证Token，本地策略直接返回空值
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func (handler Driver) Token(ctx context.Context, ttl int64, uploadSession *serializer.UploadSession, file fsctx.FileHeader) (*serializer.UploadCredential, error) {
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if util.Exists(uploadSession.SavePath) {
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return nil, errors.New("placeholder file already exist")
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}
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return &serializer.UploadCredential{
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SessionID: uploadSession.Key,
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ChunkSize: handler.Policy.OptionsSerialized.ChunkSize,
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}, nil
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}
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// 取消上传凭证
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func (handler Driver) CancelToken(ctx context.Context, uploadSession *serializer.UploadSession) error {
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return nil
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}
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