package explorer import ( "context" "encoding/base64" "encoding/json" "fmt" "io/ioutil" "net/http" "net/url" "path" "strconv" "strings" "time" model "github.com/cloudreve/Cloudreve/v3/models" "github.com/cloudreve/Cloudreve/v3/pkg/cache" "github.com/cloudreve/Cloudreve/v3/pkg/filesystem" "github.com/cloudreve/Cloudreve/v3/pkg/filesystem/driver/local" "github.com/cloudreve/Cloudreve/v3/pkg/filesystem/fsctx" "github.com/cloudreve/Cloudreve/v3/pkg/serializer" "github.com/gin-gonic/gin" "github.com/jinzhu/gorm" ) // SingleFileService 对单文件进行操作的五福,path为文件完整路径 type SingleFileService struct { Path string `uri:"path" json:"path" binding:"required,min=1,max=65535"` } // FileIDService 通过文件ID对文件进行操作的服务 type FileIDService struct { } // FileAnonymousGetService 匿名(外链)获取文件服务 type FileAnonymousGetService struct { ID uint `uri:"id" binding:"required,min=1"` Name string `uri:"name" binding:"required"` } // DownloadService 文件下載服务 type DownloadService struct { ID string `uri:"id" binding:"required"` } // SlaveDownloadService 从机文件下載服务 type SlaveDownloadService struct { PathEncoded string `uri:"path" binding:"required"` Name string `uri:"name" binding:"required"` Speed int `uri:"speed" binding:"min=0"` } // SlaveFileService 从机单文件文件相关服务 type SlaveFileService struct { PathEncoded string `uri:"path" binding:"required"` } // SlaveFilesService 从机多文件相关服务 type SlaveFilesService struct { Files []string `json:"files" binding:"required,gt=0"` } // SlaveListService 从机列表服务 type SlaveListService struct { Path string `json:"path" binding:"required,min=1,max=65535"` Recursive bool `json:"recursive"` } // New 创建新文件 func (service *SingleFileService) Create(c *gin.Context) serializer.Response { // 创建文件系统 fs, err := filesystem.NewFileSystemFromContext(c) if err != nil { return serializer.Err(serializer.CodePolicyNotAllowed, err.Error(), err) } defer fs.Recycle() // 上下文 ctx, cancel := context.WithCancel(context.Background()) defer cancel() ctx = context.WithValue(ctx, fsctx.DisableOverwrite, true) // 给文件系统分配钩子 fs.Use("BeforeUpload", filesystem.HookValidateFile) fs.Use("AfterUpload", filesystem.GenericAfterUpload) // 上传空文件 err = fs.Upload(ctx, local.FileStream{ File: ioutil.NopCloser(strings.NewReader("")), Size: 0, VirtualPath: path.Dir(service.Path), Name: path.Base(service.Path), }) if err != nil { return serializer.Err(serializer.CodeUploadFailed, err.Error(), err) } return serializer.Response{ Code: 0, } } // List 列出从机上的文件 func (service *SlaveListService) List(c *gin.Context) serializer.Response { // 创建文件系统 fs, err := filesystem.NewAnonymousFileSystem() if err != nil { return serializer.Err(serializer.CodePolicyNotAllowed, err.Error(), err) } defer fs.Recycle() objects, err := fs.Handler.List(context.Background(), service.Path, service.Recursive) if err != nil { return serializer.Err(serializer.CodeIOFailed, "无法列取文件", err) } res, _ := json.Marshal(objects) return serializer.Response{Data: string(res)} } // DownloadArchived 下載已打包的多文件 func (service *DownloadService) DownloadArchived(ctx context.Context, c *gin.Context) serializer.Response { // 创建文件系统 fs, err := filesystem.NewFileSystemFromContext(c) if err != nil { return serializer.Err(serializer.CodePolicyNotAllowed, err.Error(), err) } defer fs.Recycle() // 查找打包的临时文件 zipPath, exist := cache.Get("archive_" + service.ID) if !exist { return serializer.Err(404, "归档文件不存在", nil) } // 获取文件流 rs, err := fs.GetPhysicalFileContent(ctx, zipPath.(string)) defer rs.Close() if err != nil { return serializer.Err(serializer.CodeNotSet, err.Error(), err) } if fs.User.Group.OptionsSerialized.OneTimeDownload { // 清理资源,删除临时文件 _ = cache.Deletes([]string{service.ID}, "archive_") } c.Header("Content-Disposition", "attachment;") c.Header("Content-Type", "application/zip") http.ServeContent(c.Writer, c.Request, "", time.Now(), rs) return serializer.Response{ Code: 0, } } // Download 签名的匿名文件下载 func (service *FileAnonymousGetService) Download(ctx context.Context, c *gin.Context) serializer.Response { fs, err := filesystem.NewAnonymousFileSystem() if err != nil { return serializer.Err(serializer.CodeGroupNotAllowed, err.Error(), err) } defer fs.Recycle() // 查找文件 err = fs.SetTargetFileByIDs([]uint{service.ID}) if err != nil { return serializer.Err(serializer.CodeNotSet, err.Error(), err) } // 获取文件流 rs, err := fs.GetDownloadContent(ctx, 0) defer rs.Close() if err != nil { return serializer.Err(serializer.CodeNotSet, err.Error(), err) } // 发送文件 http.ServeContent(c.Writer, c.Request, service.Name, fs.FileTarget[0].UpdatedAt, rs) return serializer.Response{ Code: 0, } } // CreateDocPreviewSession 创建DOC文件预览会话,返回预览地址 func (service *FileIDService) CreateDocPreviewSession(ctx context.Context, c *gin.Context) serializer.Response { // 创建文件系统 fs, err := filesystem.NewFileSystemFromContext(c) if err != nil { return serializer.Err(serializer.CodePolicyNotAllowed, err.Error(), err) } defer fs.Recycle() // 获取对象id objectID, _ := c.Get("object_id") // 如果上下文中已有File对象,则重设目标 if file, ok := ctx.Value(fsctx.FileModelCtx).(*model.File); ok { fs.SetTargetFile(&[]model.File{*file}) objectID = uint(0) } // 如果上下文中已有Folder对象,则重设根目录 if folder, ok := ctx.Value(fsctx.FolderModelCtx).(*model.Folder); ok { fs.Root = folder path := ctx.Value(fsctx.PathCtx).(string) err := fs.ResetFileIfNotExist(ctx, path) if err != nil { return serializer.Err(serializer.CodeNotFound, err.Error(), err) } objectID = uint(0) } // 获取文件临时下载地址 downloadURL, err := fs.GetDownloadURL(ctx, objectID.(uint), "doc_preview_timeout") if err != nil { return serializer.Err(serializer.CodeNotSet, err.Error(), err) } // 生成最终的预览器地址 // TODO 从配置文件中读取 viewerBase, _ := url.Parse("https://view.officeapps.live.com/op/view.aspx") params := viewerBase.Query() params.Set("src", downloadURL) viewerBase.RawQuery = params.Encode() return serializer.Response{ Code: 0, Data: viewerBase.String(), } } // CreateDownloadSession 创建下载会话,获取下载URL func (service *FileIDService) CreateDownloadSession(ctx context.Context, c *gin.Context) serializer.Response { // 创建文件系统 fs, err := filesystem.NewFileSystemFromContext(c) if err != nil { return serializer.Err(serializer.CodePolicyNotAllowed, err.Error(), err) } defer fs.Recycle() // 获取对象id objectID, _ := c.Get("object_id") // 获取下载地址 downloadURL, err := fs.GetDownloadURL(ctx, objectID.(uint), "download_timeout") if err != nil { return serializer.Err(serializer.CodeNotSet, err.Error(), err) } return serializer.Response{ Code: 0, Data: downloadURL, } } // Download 通过签名URL的文件下载,无需登录 func (service *DownloadService) Download(ctx context.Context, c *gin.Context) serializer.Response { // 创建文件系统 fs, err := filesystem.NewFileSystemFromContext(c) if err != nil { return serializer.Err(serializer.CodePolicyNotAllowed, err.Error(), err) } defer fs.Recycle() // 查找打包的临时文件 file, exist := cache.Get("download_" + service.ID) if !exist { return serializer.Err(404, "文件下载会话不存在", nil) } fs.FileTarget = []model.File{file.(model.File)} // 开始处理下载 ctx = context.WithValue(ctx, fsctx.GinCtx, c) rs, err := fs.GetDownloadContent(ctx, 0) if err != nil { return serializer.Err(serializer.CodeNotSet, err.Error(), err) } defer rs.Close() // 设置文件名 c.Header("Content-Disposition", "attachment; filename=\""+url.PathEscape(fs.FileTarget[0].Name)+"\"") if fs.User.Group.OptionsSerialized.OneTimeDownload { // 清理资源,删除临时文件 _ = cache.Deletes([]string{service.ID}, "download_") } // 发送文件 http.ServeContent(c.Writer, c.Request, fs.FileTarget[0].Name, fs.FileTarget[0].UpdatedAt, rs) return serializer.Response{ Code: 0, } } // PreviewContent 预览文件,需要登录会话, isText - 是否为文本文件,文本文件会 // 强制经由服务端中转 func (service *FileIDService) PreviewContent(ctx context.Context, c *gin.Context, isText bool) serializer.Response { // 创建文件系统 fs, err := filesystem.NewFileSystemFromContext(c) if err != nil { return serializer.Err(serializer.CodePolicyNotAllowed, err.Error(), err) } defer fs.Recycle() // 获取对象id objectID, _ := c.Get("object_id") // 如果上下文中已有File对象,则重设目标 if file, ok := ctx.Value(fsctx.FileModelCtx).(*model.File); ok { fs.SetTargetFile(&[]model.File{*file}) objectID = uint(0) } // 如果上下文中已有Folder对象,则重设根目录 if folder, ok := ctx.Value(fsctx.FolderModelCtx).(*model.Folder); ok { fs.Root = folder path := ctx.Value(fsctx.PathCtx).(string) err := fs.ResetFileIfNotExist(ctx, path) if err != nil { return serializer.Err(serializer.CodeNotFound, err.Error(), err) } objectID = uint(0) } // 获取文件预览响应 resp, err := fs.Preview(ctx, objectID.(uint), isText) if err != nil { return serializer.Err(serializer.CodeNotSet, err.Error(), err) } // 重定向到文件源 if resp.Redirect { c.Header("Cache-Control", fmt.Sprintf("max-age=%d", resp.MaxAge)) return serializer.Response{ Code: -301, Data: resp.URL, } } // 直接返回文件内容 defer resp.Content.Close() if isText { c.Header("Cache-Control", "no-cache") } http.ServeContent(c.Writer, c.Request, fs.FileTarget[0].Name, fs.FileTarget[0].UpdatedAt, resp.Content) return serializer.Response{ Code: 0, } } // PutContent 更新文件内容 func (service *FileIDService) PutContent(ctx context.Context, c *gin.Context) serializer.Response { // 创建上下文 ctx, cancel := context.WithCancel(context.Background()) defer cancel() // 取得文件大小 fileSize, err := strconv.ParseUint(c.Request.Header.Get("Content-Length"), 10, 64) if err != nil { return serializer.ParamErr("无法解析文件尺寸", err) } fileData := local.FileStream{ MIMEType: c.Request.Header.Get("Content-Type"), File: c.Request.Body, Size: fileSize, } // 创建文件系统 fs, err := filesystem.NewFileSystemFromContext(c) if err != nil { return serializer.Err(serializer.CodePolicyNotAllowed, err.Error(), err) } uploadCtx := context.WithValue(ctx, fsctx.GinCtx, c) // 取得现有文件 fileID, _ := c.Get("object_id") originFile, _ := model.GetFilesByIDs([]uint{fileID.(uint)}, fs.User.ID) if len(originFile) == 0 { return serializer.Err(404, "文件不存在", nil) } fileData.Name = originFile[0].Name // 检查此文件是否有软链接 fileList, err := model.RemoveFilesWithSoftLinks([]model.File{originFile[0]}) if err == nil && len(fileList) == 0 { // 如果包含软连接,应重新生成新文件副本,并更新source_name originFile[0].SourceName = fs.GenerateSavePath(uploadCtx, fileData) fs.Use("AfterUpload", filesystem.HookUpdateSourceName) fs.Use("AfterUploadCanceled", filesystem.HookUpdateSourceName) fs.Use("AfterValidateFailed", filesystem.HookUpdateSourceName) } // 给文件系统分配钩子 fs.Use("BeforeUpload", filesystem.HookResetPolicy) fs.Use("BeforeUpload", filesystem.HookValidateFile) fs.Use("BeforeUpload", filesystem.HookChangeCapacity) fs.Use("AfterUploadCanceled", filesystem.HookCleanFileContent) fs.Use("AfterUploadCanceled", filesystem.HookClearFileSize) fs.Use("AfterUploadCanceled", filesystem.HookGiveBackCapacity) fs.Use("AfterUpload", filesystem.GenericAfterUpdate) fs.Use("AfterValidateFailed", filesystem.HookCleanFileContent) fs.Use("AfterValidateFailed", filesystem.HookClearFileSize) fs.Use("AfterValidateFailed", filesystem.HookGiveBackCapacity) // 执行上传 uploadCtx = context.WithValue(uploadCtx, fsctx.FileModelCtx, originFile[0]) err = fs.Upload(uploadCtx, fileData) if err != nil { return serializer.Err(serializer.CodeUploadFailed, err.Error(), err) } return serializer.Response{ Code: 0, } } // ServeFile 通过签名的URL下载从机文件 func (service *SlaveDownloadService) ServeFile(ctx context.Context, c *gin.Context, isDownload bool) serializer.Response { // 创建文件系统 fs, err := filesystem.NewAnonymousFileSystem() if err != nil { return serializer.Err(serializer.CodePolicyNotAllowed, err.Error(), err) } defer fs.Recycle() // 解码文件路径 fileSource, err := base64.RawURLEncoding.DecodeString(service.PathEncoded) if err != nil { return serializer.ParamErr("无法解析的文件地址", err) } // 根据URL里的信息创建一个文件对象和用户对象 file := model.File{ Name: service.Name, SourceName: string(fileSource), Policy: model.Policy{ Model: gorm.Model{ID: 1}, Type: "local", }, } fs.User = &model.User{ Group: model.Group{SpeedLimit: service.Speed}, } fs.FileTarget = []model.File{file} // 开始处理下载 ctx = context.WithValue(ctx, fsctx.GinCtx, c) rs, err := fs.GetDownloadContent(ctx, 0) if err != nil { return serializer.Err(serializer.CodeNotSet, err.Error(), err) } defer rs.Close() // 设置下载文件名 if isDownload { c.Header("Content-Disposition", "attachment; filename=\""+url.PathEscape(fs.FileTarget[0].Name)+"\"") } // 发送文件 http.ServeContent(c.Writer, c.Request, fs.FileTarget[0].Name, time.Now(), rs) return serializer.Response{ Code: 0, } } // Delete 通过签名的URL删除从机文件 func (service *SlaveFilesService) Delete(ctx context.Context, c *gin.Context) serializer.Response { // 创建文件系统 fs, err := filesystem.NewAnonymousFileSystem() if err != nil { return serializer.Err(serializer.CodePolicyNotAllowed, err.Error(), err) } defer fs.Recycle() // 删除文件 failed, err := fs.Handler.Delete(ctx, service.Files) if err != nil { // 将Data字段写为字符串方便主控端解析 data, _ := json.Marshal(serializer.RemoteDeleteRequest{Files: failed}) return serializer.Response{ Code: serializer.CodeNotFullySuccess, Data: string(data), Msg: fmt.Sprintf("有 %d 个文件未能成功删除", len(failed)), Error: err.Error(), } } return serializer.Response{Code: 0} } // Thumb 通过签名URL获取从机文件缩略图 func (service *SlaveFileService) Thumb(ctx context.Context, c *gin.Context) serializer.Response { // 创建文件系统 fs, err := filesystem.NewAnonymousFileSystem() if err != nil { return serializer.Err(serializer.CodePolicyNotAllowed, err.Error(), err) } defer fs.Recycle() // 解码文件路径 fileSource, err := base64.RawURLEncoding.DecodeString(service.PathEncoded) if err != nil { return serializer.ParamErr("无法解析的文件地址", err) } fs.FileTarget = []model.File{{SourceName: string(fileSource), PicInfo: "1,1"}} // 获取缩略图 resp, err := fs.GetThumb(ctx, 0) if err != nil { return serializer.Err(serializer.CodeNotSet, "无法获取缩略图", err) } defer resp.Content.Close() http.ServeContent(c.Writer, c.Request, "thumb.png", time.Now(), resp.Content) return serializer.Response{Code: 0} }