157 lines
4 KiB
Go
157 lines
4 KiB
Go
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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model "github.com/HFO4/cloudreve/models"
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"github.com/HFO4/cloudreve/pkg/auth"
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"github.com/HFO4/cloudreve/pkg/cache"
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"github.com/HFO4/cloudreve/pkg/conf"
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"github.com/HFO4/cloudreve/pkg/filesystem/fsctx"
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"github.com/HFO4/cloudreve/pkg/filesystem/response"
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"github.com/HFO4/cloudreve/pkg/serializer"
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"github.com/HFO4/cloudreve/pkg/util"
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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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"time"
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)
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// Handler 本地策略适配器
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type Handler struct {
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Policy *model.Policy
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}
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// Get 获取文件内容
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func (handler Handler) 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(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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// 开启一个协程，用于请求结束后关闭reader
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// go closeReader(ctx, file)
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return file, nil
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}
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// closeReader 用于在请求结束后关闭reader
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// TODO 让业务代码自己关闭
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func closeReader(ctx context.Context, closer io.Closer) {
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select {
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case <-ctx.Done():
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_ = closer.Close()
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}
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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 Handler) Put(ctx context.Context, file io.ReadCloser, dst string, size uint64) error {
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defer file.Close()
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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, 0700)
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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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// 创建目标文件
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out, err := os.Create(dst)
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if err != nil {
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util.Log().Warning("无法创建文件，%s", err)
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return err
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}
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defer out.Close()
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// 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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// 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 Handler) 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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err := os.Remove(value)
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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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// 尝试删除文件的缩略图（如果有）
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_ = os.Remove(value + conf.ThumbConfig.FileSuffix)
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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 Handler) Thumb(ctx context.Context, path string) (*response.ContentResponse, error) {
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file, err := handler.Get(ctx, path+conf.ThumbConfig.FileSuffix)
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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 Handler) Source(ctx context.Context, path string, url url.URL, expires int64) (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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// 签名生成文件记录
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signedURI, err := auth.SignURI(
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fmt.Sprintf("/api/v3/file/get/%d/%s", file.ID, file.Name),
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0,
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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 := url.ResolveReference(signedURI).String()
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return finalURL, nil
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}
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func (handler Handler) GetDownloadURL(ctx context.Context, path string, url url.URL, ttl int64) (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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// 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, "无法创建下載会话", 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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fmt.Sprintf("/api/v3/file/download/%s", downloadSessionID),
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time.Now().Unix()+ttl,
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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 := url.ResolveReference(signedURI).String()
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return finalURL, nil
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}
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