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// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package app
import (
"bytes"
"image"
"image/color/palette"
"image/draw"
"image/gif"
_ "image/jpeg"
"image/png"
"io"
"mime/multipart"
"net/http"
"github.com/disintegration/imaging"
"github.com/mattermost/platform/model"
)
const (
MaxEmojiFileSize = 1000 * 1024 // 1 MB
MaxEmojiWidth = 128
MaxEmojiHeight = 128
)
func CreateEmoji(sessionUserId string, emoji *model.Emoji, multiPartImageData *multipart.Form) (*model.Emoji, *model.AppError) {
// wipe the emoji id so that existing emojis can't get overwritten
emoji.Id = ""
// do our best to validate the emoji before committing anything to the DB so that we don't have to clean up
// orphaned files left over when validation fails later on
emoji.PreSave()
if err := emoji.IsValid(); err != nil {
return nil, err
}
if emoji.CreatorId != sessionUserId {
return nil, model.NewAppError("createEmoji", "api.emoji.create.other_user.app_error", nil, "", http.StatusForbidden)
}
if result := <-Srv.Store.Emoji().GetByName(emoji.Name); result.Err == nil && result.Data != nil {
return nil, model.NewAppError("createEmoji", "api.emoji.create.duplicate.app_error", nil, "", http.StatusBadRequest)
}
if imageData := multiPartImageData.File["image"]; len(imageData) == 0 {
err := model.NewLocAppError("Context", "api.context.invalid_body_param.app_error", map[string]interface{}{"Name": "createEmoji"}, "")
err.StatusCode = http.StatusBadRequest
return nil, err
} else if err := UploadEmojiImage(emoji.Id, imageData[0]); err != nil {
return nil, err
}
if result := <-Srv.Store.Emoji().Save(emoji); result.Err != nil {
return nil, result.Err
} else {
return result.Data.(*model.Emoji), nil
}
}
func GetEmojiList() ([]*model.Emoji, *model.AppError) {
if result := <-Srv.Store.Emoji().GetAll(); result.Err != nil {
return nil, result.Err
} else {
return result.Data.([]*model.Emoji), nil
}
}
func UploadEmojiImage(id string, imageData *multipart.FileHeader) *model.AppError {
file, err := imageData.Open()
if err != nil {
return model.NewAppError("uploadEmojiImage", "api.emoji.upload.open.app_error", nil, "", http.StatusBadRequest)
}
defer file.Close()
buf := bytes.NewBuffer(nil)
io.Copy(buf, file)
// make sure the file is an image and is within the required dimensions
if config, _, err := image.DecodeConfig(bytes.NewReader(buf.Bytes())); err != nil {
return model.NewAppError("uploadEmojiImage", "api.emoji.upload.image.app_error", nil, "", http.StatusBadRequest)
} else if config.Width > MaxEmojiWidth || config.Height > MaxEmojiHeight {
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.NewAppError("uploadEmojiImage", "api.emoji.upload.large_image.gif_decode_error", nil, "", http.StatusBadRequest)
} else {
resized_gif := resizeEmojiGif(gif_data)
if err := gif.EncodeAll(newbuf, resized_gif); err != nil {
return model.NewAppError("uploadEmojiImage", "api.emoji.upload.large_image.gif_encode_error", nil, "", http.StatusBadRequest)
}
if err := WriteFile(newbuf.Bytes(), getEmojiImagePath(id)); err != nil {
return err
}
}
} else {
if img, _, err := image.Decode(bytes.NewReader(data)); err != nil {
return model.NewAppError("uploadEmojiImage", "api.emoji.upload.large_image.decode_error", nil, "", http.StatusBadRequest)
} else {
resized_image := resizeEmoji(img, config.Width, config.Height)
if err := png.Encode(newbuf, resized_image); err != nil {
return model.NewAppError("uploadEmojiImage", "api.emoji.upload.large_image.encode_error", nil, "", http.StatusBadRequest)
}
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
}
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 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 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
}
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