diff options
Diffstat (limited to 'api/emoji.go')
-rw-r--r-- | api/emoji.go | 87 |
1 files changed, 79 insertions, 8 deletions
diff --git a/api/emoji.go b/api/emoji.go index 39f57a3c8..9108db2ad 100644 --- a/api/emoji.go +++ b/api/emoji.go @@ -6,23 +6,26 @@ package api import ( "bytes" "image" - _ "image/gif" + "image/draw" + "image/gif" _ "image/jpeg" - _ "image/png" + "image/png" "io" "mime/multipart" "net/http" "strings" l4g "github.com/alecthomas/log4go" + "github.com/disintegration/imaging" "github.com/gorilla/mux" "github.com/mattermost/platform/einterfaces" "github.com/mattermost/platform/model" "github.com/mattermost/platform/utils" + "image/color/palette" ) const ( - MaxEmojiFileSize = 64 * 1024 // 64 KB + MaxEmojiFileSize = 1000 * 1024 // 1 MB MaxEmojiWidth = 128 MaxEmojiHeight = 128 ) @@ -147,11 +150,39 @@ func uploadEmojiImage(id string, imageData *multipart.FileHeader) *model.AppErro if config, _, err := image.DecodeConfig(bytes.NewReader(buf.Bytes())); err != nil { return model.NewLocAppError("uploadEmojiImage", "api.emoji.upload.image.app_error", nil, err.Error()) } else if config.Width > MaxEmojiWidth || config.Height > MaxEmojiHeight { - return model.NewLocAppError("uploadEmojiImage", "api.emoji.upload.large_image.app_error", nil, "") - } - - if err := WriteFile(buf.Bytes(), getEmojiImagePath(id)); err != nil { - return err + data := buf.Bytes() + newbuf := bytes.NewBuffer(nil) + if info, err := model.GetInfoForBytes(imageData.Filename, data); err != nil { + return err + } else if info.MimeType == "image/gif" { + if gif_data, err := gif.DecodeAll(bytes.NewReader(data)); err != nil { + return model.NewLocAppError("uploadEmojiImage", "api.emoji.upload.large_image.gif_decode_error", nil, "") + } else { + resized_gif := resizeEmojiGif(gif_data) + if err := gif.EncodeAll(newbuf, resized_gif); err != nil { + return model.NewLocAppError("uploadEmojiImage", "api.emoji.upload.large_image.gif_encode_error", nil, "") + } + if err := WriteFile(newbuf.Bytes(), getEmojiImagePath(id)); err != nil { + return err + } + } + } else { + if img, _, err := image.Decode(bytes.NewReader(data)); err != nil { + return model.NewLocAppError("uploadEmojiImage", "api.emoji.upload.large_image.decode_error", nil, "") + } else { + resized_image := resizeEmoji(img, config.Width, config.Height) + if err := png.Encode(newbuf, resized_image); err != nil { + return model.NewLocAppError("uploadEmojiImage", "api.emoji.upload.large_image.encode_error", nil, "") + } + if err := WriteFile(newbuf.Bytes(), getEmojiImagePath(id)); err != nil { + return err + } + } + } + } else { + if err := WriteFile(buf.Bytes(), getEmojiImagePath(id)); err != nil { + return err + } } return nil @@ -252,3 +283,43 @@ func getEmojiImage(c *Context, w http.ResponseWriter, r *http.Request) { func getEmojiImagePath(id string) string { return "emoji/" + id + "/image" } + +func resizeEmoji(img image.Image, width int, height int) image.Image { + emojiWidth := float64(width) + emojiHeight := float64(height) + + var emoji image.Image + if emojiHeight <= MaxEmojiHeight && emojiWidth <= MaxEmojiWidth { + emoji = img + } else { + emoji = imaging.Fit(img, MaxEmojiWidth, MaxEmojiHeight, imaging.Lanczos) + } + return emoji +} + +func resizeEmojiGif(gifImg *gif.GIF) *gif.GIF { + // Create a new RGBA image to hold the incremental frames. + firstFrame := gifImg.Image[0].Bounds() + b := image.Rect(0, 0, firstFrame.Dx(), firstFrame.Dy()) + img := image.NewRGBA(b) + + resizedImage := image.Image(nil) + // Resize each frame. + for index, frame := range gifImg.Image { + bounds := frame.Bounds() + draw.Draw(img, bounds, frame, bounds.Min, draw.Over) + resizedImage = resizeEmoji(img, firstFrame.Dx(), firstFrame.Dy()) + gifImg.Image[index] = imageToPaletted(resizedImage) + } + // Set new gif width and height + gifImg.Config.Width = resizedImage.Bounds().Dx() + gifImg.Config.Height = resizedImage.Bounds().Dy() + return gifImg +} + +func imageToPaletted(img image.Image) *image.Paletted { + b := img.Bounds() + pm := image.NewPaletted(b, palette.Plan9) + draw.FloydSteinberg.Draw(pm, b, img, image.ZP) + return pm +} |