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// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package api
import (
"image"
"image/draw"
"image/gif"
"net/http"
"strings"
"image/color/palette"
l4g "github.com/alecthomas/log4go"
"github.com/disintegration/imaging"
"github.com/gorilla/mux"
"github.com/mattermost/mattermost-server/app"
"github.com/mattermost/mattermost-server/einterfaces"
"github.com/mattermost/mattermost-server/model"
"github.com/mattermost/mattermost-server/utils"
)
func InitEmoji() {
l4g.Debug(utils.T("api.emoji.init.debug"))
BaseRoutes.Emoji.Handle("/list", ApiUserRequired(getEmoji)).Methods("GET")
BaseRoutes.Emoji.Handle("/create", ApiUserRequired(createEmoji)).Methods("POST")
BaseRoutes.Emoji.Handle("/delete", ApiUserRequired(deleteEmoji)).Methods("POST")
BaseRoutes.Emoji.Handle("/{id:[A-Za-z0-9_]+}", ApiUserRequiredTrustRequester(getEmojiImage)).Methods("GET")
}
func getEmoji(c *Context, w http.ResponseWriter, r *http.Request) {
if !*utils.Cfg.ServiceSettings.EnableCustomEmoji {
c.Err = model.NewAppError("getEmoji", "api.emoji.disabled.app_error", nil, "", http.StatusNotImplemented)
return
}
listEmoji, err := c.App.GetEmojiList(0, 100000)
if err != nil {
c.Err = err
return
} else {
w.Write([]byte(model.EmojiListToJson(listEmoji)))
}
}
func createEmoji(c *Context, w http.ResponseWriter, r *http.Request) {
if !*utils.Cfg.ServiceSettings.EnableCustomEmoji {
c.Err = model.NewAppError("createEmoji", "api.emoji.disabled.app_error", nil, "", http.StatusNotImplemented)
return
}
if emojiInterface := einterfaces.GetEmojiInterface(); emojiInterface != nil &&
!emojiInterface.CanUserCreateEmoji(c.Session.Roles, c.Session.TeamMembers) {
c.Err = model.NewAppError("createEmoji", "api.emoji.create.permissions.app_error", nil, "user_id="+c.Session.UserId, http.StatusUnauthorized)
return
}
if len(*utils.Cfg.FileSettings.DriverName) == 0 {
c.Err = model.NewAppError("createEmoji", "api.emoji.storage.app_error", nil, "", http.StatusNotImplemented)
return
}
if r.ContentLength > app.MaxEmojiFileSize {
c.Err = model.NewAppError("createEmoji", "api.emoji.create.too_large.app_error", nil, "", http.StatusRequestEntityTooLarge)
return
}
if err := r.ParseMultipartForm(app.MaxEmojiFileSize); err != nil {
c.Err = model.NewAppError("createEmoji", "api.emoji.create.parse.app_error", nil, err.Error(), http.StatusBadRequest)
return
}
m := r.MultipartForm
props := m.Value
emoji := model.EmojiFromJson(strings.NewReader(props["emoji"][0]))
if emoji == nil {
c.SetInvalidParam("createEmoji", "emoji")
return
}
// 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 {
c.Err = err
c.Err.StatusCode = http.StatusBadRequest
return
}
if emoji.CreatorId != c.Session.UserId {
c.Err = model.NewAppError("createEmoji", "api.emoji.create.other_user.app_error", nil, "", http.StatusUnauthorized)
return
}
if result := <-c.App.Srv.Store.Emoji().GetByName(emoji.Name); result.Err == nil && result.Data != nil {
c.Err = model.NewAppError("createEmoji", "api.emoji.create.duplicate.app_error", nil, "", http.StatusBadRequest)
return
}
if imageData := m.File["image"]; len(imageData) == 0 {
c.SetInvalidParam("createEmoji", "image")
return
} else if err := app.UploadEmojiImage(emoji.Id, imageData[0]); err != nil {
c.Err = err
return
}
if result := <-c.App.Srv.Store.Emoji().Save(emoji); result.Err != nil {
c.Err = result.Err
return
} else {
message := model.NewWebSocketEvent(model.WEBSOCKET_EVENT_EMOJI_ADDED, "", "", "", nil)
message.Add("emoji", result.Data.(*model.Emoji).ToJson())
app.Publish(message)
w.Write([]byte(result.Data.(*model.Emoji).ToJson()))
}
}
func deleteEmoji(c *Context, w http.ResponseWriter, r *http.Request) {
if !*utils.Cfg.ServiceSettings.EnableCustomEmoji {
c.Err = model.NewAppError("deleteEmoji", "api.emoji.disabled.app_error", nil, "", http.StatusNotImplemented)
return
}
if len(*utils.Cfg.FileSettings.DriverName) == 0 {
c.Err = model.NewAppError("deleteImage", "api.emoji.storage.app_error", nil, "", http.StatusNotImplemented)
return
}
props := model.MapFromJson(r.Body)
id := props["id"]
if len(id) == 0 {
c.SetInvalidParam("deleteEmoji", "id")
return
}
emoji, err := c.App.GetEmoji(id)
if err != nil {
c.Err = err
return
}
if c.Session.UserId != emoji.CreatorId && !app.SessionHasPermissionTo(c.Session, model.PERMISSION_MANAGE_SYSTEM) {
c.Err = model.NewAppError("deleteEmoji", "api.emoji.delete.permissions.app_error", nil, "user_id="+c.Session.UserId, http.StatusUnauthorized)
return
}
err = c.App.DeleteEmoji(emoji)
if err != nil {
c.Err = err
return
} else {
ReturnStatusOK(w)
}
}
func getEmojiImage(c *Context, w http.ResponseWriter, r *http.Request) {
if !*utils.Cfg.ServiceSettings.EnableCustomEmoji {
c.Err = model.NewAppError("getEmojiImage", "api.emoji.disabled.app_error", nil, "", http.StatusNotImplemented)
return
}
if len(*utils.Cfg.FileSettings.DriverName) == 0 {
c.Err = model.NewAppError("getEmojiImage", "api.emoji.storage.app_error", nil, "", http.StatusNotImplemented)
return
}
params := mux.Vars(r)
id := params["id"]
if len(id) == 0 {
c.SetInvalidParam("getEmojiImage", "id")
return
}
image, imageType, err := c.App.GetEmojiImage(id)
if err != nil {
c.Err = err
return
}
w.Header().Set("Content-Type", "image/"+imageType)
w.Header().Set("Cache-Control", "max-age=2592000, public")
w.Write(image)
}
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 <= app.MaxEmojiHeight && emojiWidth <= app.MaxEmojiWidth {
emoji = img
} else {
emoji = imaging.Fit(img, app.MaxEmojiWidth, app.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
}
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