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// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package api
import (
"bytes"
"image"
_ "image/gif"
_ "image/jpeg"
_ "image/png"
"io"
"mime/multipart"
"net/http"
"strings"
l4g "github.com/alecthomas/log4go"
"github.com/gorilla/mux"
"github.com/mattermost/platform/einterfaces"
"github.com/mattermost/platform/model"
"github.com/mattermost/platform/utils"
)
const (
MaxEmojiFileSize = 64 * 1024 // 64 KB
MaxEmojiWidth = 128
MaxEmojiHeight = 128
)
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.NewLocAppError("getEmoji", "api.emoji.disabled.app_error", nil, "")
c.Err.StatusCode = http.StatusNotImplemented
return
}
if result := <-Srv.Store.Emoji().GetAll(); result.Err != nil {
c.Err = result.Err
return
} else {
emoji := result.Data.([]*model.Emoji)
w.Write([]byte(model.EmojiListToJson(emoji)))
}
}
func createEmoji(c *Context, w http.ResponseWriter, r *http.Request) {
if !*utils.Cfg.ServiceSettings.EnableCustomEmoji {
c.Err = model.NewLocAppError("createEmoji", "api.emoji.disabled.app_error", nil, "")
c.Err.StatusCode = http.StatusNotImplemented
return
}
if emojiInterface := einterfaces.GetEmojiInterface(); emojiInterface != nil &&
!emojiInterface.CanUserCreateEmoji(c.Session.Roles, c.Session.TeamMembers) {
c.Err = model.NewLocAppError("createEmoji", "api.emoji.create.permissions.app_error", nil, "user_id="+c.Session.UserId)
c.Err.StatusCode = http.StatusUnauthorized
return
}
if len(utils.Cfg.FileSettings.DriverName) == 0 {
c.Err = model.NewLocAppError("createEmoji", "api.emoji.storage.app_error", nil, "")
c.Err.StatusCode = http.StatusNotImplemented
return
}
if r.ContentLength > MaxEmojiFileSize {
c.Err = model.NewLocAppError("createEmoji", "api.emoji.create.too_large.app_error", nil, "")
c.Err.StatusCode = http.StatusRequestEntityTooLarge
return
}
if err := r.ParseMultipartForm(MaxEmojiFileSize); err != nil {
c.Err = model.NewLocAppError("createEmoji", "api.emoji.create.parse.app_error", nil, err.Error())
c.Err.StatusCode = 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.NewLocAppError("createEmoji", "api.emoji.create.other_user.app_error", nil, "")
c.Err.StatusCode = http.StatusUnauthorized
return
}
if result := <-Srv.Store.Emoji().GetByName(emoji.Name); result.Err == nil && result.Data != nil {
c.Err = model.NewLocAppError("createEmoji", "api.emoji.create.duplicate.app_error", nil, "")
c.Err.StatusCode = http.StatusBadRequest
return
}
if imageData := m.File["image"]; len(imageData) == 0 {
c.SetInvalidParam("createEmoji", "image")
return
} else if err := uploadEmojiImage(emoji.Id, imageData[0]); err != nil {
c.Err = err
return
}
if result := <-Srv.Store.Emoji().Save(emoji); result.Err != nil {
c.Err = result.Err
return
} else {
w.Write([]byte(result.Data.(*model.Emoji).ToJson()))
}
}
func uploadEmojiImage(id string, imageData *multipart.FileHeader) *model.AppError {
file, err := imageData.Open()
if err != nil {
return model.NewLocAppError("uploadEmojiImage", "api.emoji.upload.open.app_error", nil, "")
}
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.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
}
return nil
}
func deleteEmoji(c *Context, w http.ResponseWriter, r *http.Request) {
if !*utils.Cfg.ServiceSettings.EnableCustomEmoji {
c.Err = model.NewLocAppError("deleteEmoji", "api.emoji.disabled.app_error", nil, "")
c.Err.StatusCode = http.StatusNotImplemented
return
}
if len(utils.Cfg.FileSettings.DriverName) == 0 {
c.Err = model.NewLocAppError("deleteImage", "api.emoji.storage.app_error", nil, "")
c.Err.StatusCode = http.StatusNotImplemented
return
}
props := model.MapFromJson(r.Body)
id := props["id"]
if len(id) == 0 {
c.SetInvalidParam("deleteEmoji", "id")
return
}
if result := <-Srv.Store.Emoji().Get(id); result.Err != nil {
c.Err = result.Err
return
} else {
if c.Session.UserId != result.Data.(*model.Emoji).CreatorId && !c.IsSystemAdmin() {
c.Err = model.NewLocAppError("deleteEmoji", "api.emoji.delete.permissions.app_error", nil, "user_id="+c.Session.UserId)
c.Err.StatusCode = http.StatusUnauthorized
return
}
}
if err := (<-Srv.Store.Emoji().Delete(id, model.GetMillis())).Err; err != nil {
c.Err = err
return
}
go deleteEmojiImage(id)
ReturnStatusOK(w)
}
func deleteEmojiImage(id string) {
if err := MoveFile(getEmojiImagePath(id), "emoji/"+id+"/image_deleted"); err != nil {
l4g.Error("Failed to rename image when deleting emoji %v", id)
}
}
func getEmojiImage(c *Context, w http.ResponseWriter, r *http.Request) {
if !*utils.Cfg.ServiceSettings.EnableCustomEmoji {
c.Err = model.NewLocAppError("getEmojiImage", "api.emoji.disabled.app_error", nil, "")
c.Err.StatusCode = http.StatusNotImplemented
return
}
if len(utils.Cfg.FileSettings.DriverName) == 0 {
c.Err = model.NewLocAppError("getEmojiImage", "api.emoji.storage.app_error", nil, "")
c.Err.StatusCode = http.StatusNotImplemented
return
}
params := mux.Vars(r)
id := params["id"]
if len(id) == 0 {
c.SetInvalidParam("getEmojiImage", "id")
return
}
if result := <-Srv.Store.Emoji().Get(id); result.Err != nil {
c.Err = result.Err
return
} else {
var img []byte
if data, err := ReadFile(getEmojiImagePath(id)); err != nil {
c.Err = model.NewLocAppError("getEmojiImage", "api.emoji.get_image.read.app_error", nil, err.Error())
return
} else {
img = data
}
if _, imageType, err := image.DecodeConfig(bytes.NewReader(img)); err != nil {
model.NewLocAppError("getEmojiImage", "api.emoji.get_image.decode.app_error", nil, err.Error())
} else {
w.Header().Set("Content-Type", "image/"+imageType)
}
w.Write(img)
}
}
func getEmojiImagePath(id string) string {
return "emoji/" + id + "/image"
}
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