|
| 1 | +package http |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "image" |
| 6 | + "net/http" |
| 7 | + |
| 8 | + "github.com/disintegration/imaging" |
| 9 | + "github.com/gorilla/mux" |
| 10 | + |
| 11 | + "github.com/filebrowser/filebrowser/v2/files" |
| 12 | +) |
| 13 | + |
| 14 | +const ( |
| 15 | + sizeThumb = "thumb" |
| 16 | + sizeBig = "big" |
| 17 | +) |
| 18 | + |
| 19 | +type imageProcessor func(src image.Image) (image.Image, error) |
| 20 | + |
| 21 | +var previewHandler = withUser(func(w http.ResponseWriter, r *http.Request, d *data) (int, error) { |
| 22 | + if !d.user.Perm.Download { |
| 23 | + return http.StatusAccepted, nil |
| 24 | + } |
| 25 | + vars := mux.Vars(r) |
| 26 | + size := vars["size"] |
| 27 | + if size != sizeBig && size != sizeThumb { |
| 28 | + return http.StatusNotImplemented, nil |
| 29 | + } |
| 30 | + |
| 31 | + file, err := files.NewFileInfo(files.FileOptions{ |
| 32 | + Fs: d.user.Fs, |
| 33 | + Path: "/" + vars["path"], |
| 34 | + Modify: d.user.Perm.Modify, |
| 35 | + Expand: true, |
| 36 | + Checker: d, |
| 37 | + }) |
| 38 | + if err != nil { |
| 39 | + return errToStatus(err), err |
| 40 | + } |
| 41 | + |
| 42 | + setContentDisposition(w, r, file) |
| 43 | + |
| 44 | + switch file.Type { |
| 45 | + case "image": |
| 46 | + return handleImagePreview(w, r, file, size) |
| 47 | + default: |
| 48 | + return http.StatusNotImplemented, fmt.Errorf("can't create preview for %s type", file.Type) |
| 49 | + } |
| 50 | +}) |
| 51 | + |
| 52 | +func handleImagePreview(w http.ResponseWriter, r *http.Request, file *files.FileInfo, size string) (int, error) { |
| 53 | + format, err := imaging.FormatFromExtension(file.Extension) |
| 54 | + if err != nil { |
| 55 | + // Unsupported extensions directly return the raw data |
| 56 | + if err == imaging.ErrUnsupportedFormat { |
| 57 | + return rawFileHandler(w, r, file) |
| 58 | + } |
| 59 | + return errToStatus(err), err |
| 60 | + } |
| 61 | + |
| 62 | + var imgProcessor imageProcessor |
| 63 | + switch size { |
| 64 | + case sizeBig: |
| 65 | + imgProcessor = func(img image.Image) (image.Image, error) { |
| 66 | + return imaging.Fit(img, 1080, 1080, imaging.Lanczos), nil |
| 67 | + } |
| 68 | + case sizeThumb: |
| 69 | + imgProcessor = func(img image.Image) (image.Image, error) { |
| 70 | + return imaging.Thumbnail(img, 128, 128, imaging.Box), nil |
| 71 | + } |
| 72 | + default: |
| 73 | + return http.StatusBadRequest, fmt.Errorf("unsupported preview size %s", size) |
| 74 | + } |
| 75 | + |
| 76 | + fd, err := file.Fs.Open(file.Path) |
| 77 | + if err != nil { |
| 78 | + return errToStatus(err), err |
| 79 | + } |
| 80 | + defer fd.Close() |
| 81 | + |
| 82 | + img, err := imaging.Decode(fd, imaging.AutoOrientation(true)) |
| 83 | + if err != nil { |
| 84 | + return errToStatus(err), err |
| 85 | + } |
| 86 | + img, err = imgProcessor(img) |
| 87 | + if err != nil { |
| 88 | + return errToStatus(err), err |
| 89 | + } |
| 90 | + if imaging.Encode(w, img, format) != nil { |
| 91 | + return errToStatus(err), err |
| 92 | + } |
| 93 | + return 0, nil |
| 94 | +} |
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