139 lines
3.5 KiB
Go
139 lines
3.5 KiB
Go
//go:generate go-enum --sql --marshal --names --file $GOFILE
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package http
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import (
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"bytes"
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"context"
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"fmt"
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"io"
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"net/http"
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"github.com/gorilla/mux"
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"github.com/filebrowser/filebrowser/v2/files"
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"github.com/filebrowser/filebrowser/v2/img"
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)
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/*
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ENUM(
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thumb
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big
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)
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*/
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type PreviewSize int
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type ImgService interface {
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FormatFromExtension(ext string) (img.Format, error)
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Resize(ctx context.Context, in io.Reader, width, height int, out io.Writer, options ...img.Option) error
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}
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type FileCache interface {
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Store(ctx context.Context, key string, value []byte) error
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Load(ctx context.Context, key string) ([]byte, bool, error)
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Delete(ctx context.Context, key string) error
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}
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func previewHandler(imgSvc ImgService, fileCache FileCache, enableThumbnails, resizePreview bool) handleFunc {
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return withUser(func(w http.ResponseWriter, r *http.Request, d *data) (int, error) {
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if !d.user.Perm.Download {
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return http.StatusAccepted, nil
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}
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vars := mux.Vars(r)
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previewSize, err := ParsePreviewSize(vars["size"])
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if err != nil {
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return http.StatusBadRequest, err
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}
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file, err := files.NewFileInfo(files.FileOptions{
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Fs: d.user.Fs,
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Path: "/" + vars["path"],
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Modify: d.user.Perm.Modify,
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Expand: true,
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ReadHeader: d.server.TypeDetectionByHeader,
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Checker: d,
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})
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if err != nil {
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return errToStatus(err), err
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}
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setContentDisposition(w, r, file)
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switch file.Type {
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case "image":
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return handleImagePreview(w, r, imgSvc, fileCache, file, previewSize, enableThumbnails, resizePreview)
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default:
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return http.StatusNotImplemented, fmt.Errorf("can't create preview for %s type", file.Type)
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}
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})
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}
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func handleImagePreview(w http.ResponseWriter, r *http.Request, imgSvc ImgService, fileCache FileCache,
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file *files.FileInfo, previewSize PreviewSize, enableThumbnails, resizePreview bool) (int, error) {
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format, err := imgSvc.FormatFromExtension(file.Extension)
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if err != nil {
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// Unsupported extensions directly return the raw data
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if err == img.ErrUnsupportedFormat {
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return rawFileHandler(w, r, file)
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}
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return errToStatus(err), err
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}
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cacheKey := previewCacheKey(file.Path, file.ModTime.Unix(), previewSize)
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cachedFile, ok, err := fileCache.Load(r.Context(), cacheKey)
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if err != nil {
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return errToStatus(err), err
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}
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if ok {
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_, _ = w.Write(cachedFile)
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return 0, nil
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}
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fd, err := file.Fs.Open(file.Path)
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if err != nil {
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return errToStatus(err), err
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}
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defer fd.Close()
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var (
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width int
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height int
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options []img.Option
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)
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switch {
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case previewSize == PreviewSizeBig && resizePreview && format != img.FormatGif:
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width = 1080
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height = 1080
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options = append(options, img.WithMode(img.ResizeModeFit), img.WithQuality(img.QualityMedium))
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case previewSize == PreviewSizeThumb && enableThumbnails:
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width = 128
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height = 128
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options = append(options, img.WithMode(img.ResizeModeFill), img.WithQuality(img.QualityLow), img.WithFormat(img.FormatJpeg))
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default:
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if _, err := rawFileHandler(w, r, file); err != nil {
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return errToStatus(err), err
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}
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return 0, nil
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}
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buf := &bytes.Buffer{}
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if err := imgSvc.Resize(context.Background(), fd, width, height, buf, options...); err != nil {
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return 0, err
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}
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go func() {
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if err := fileCache.Store(context.Background(), cacheKey, buf.Bytes()); err != nil {
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fmt.Printf("failed to cache resized image: %v", err)
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}
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}()
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_, _ = w.Write(buf.Bytes())
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return 0, nil
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}
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func previewCacheKey(fPath string, fTime int64, previewSize PreviewSize) string {
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return fmt.Sprintf("%x%x%x", fPath, fTime, previewSize)
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}
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