summaryrefslogtreecommitdiffstats
path: root/app/emoji.go
blob: 20d4bb44de84433c817c6f037d6b0471b05f93bc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.

package app

import (
	"bytes"
	"image"
	"image/draw"
	"image/gif"
	_ "image/jpeg"
	"image/png"
	"io"
	"mime/multipart"
	"net/http"

	l4g "github.com/alecthomas/log4go"

	"image/color/palette"

	"github.com/disintegration/imaging"
	"github.com/mattermost/mattermost-server/model"
	"github.com/mattermost/mattermost-server/utils"
)

const (
	MaxEmojiFileSize = 1000 * 1024 // 1 MB
	MaxEmojiWidth    = 128
	MaxEmojiHeight   = 128
)

func (a *App) 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 := <-a.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.NewAppError("Context", "api.context.invalid_body_param.app_error", map[string]interface{}{"Name": "createEmoji"}, "", http.StatusBadRequest)
		return nil, err
	} else if err := a.UploadEmojiImage(emoji.Id, imageData[0]); err != nil {
		return nil, err
	}

	if result := <-a.Srv.Store.Emoji().Save(emoji); result.Err != nil {
		return nil, result.Err
	} else {
		message := model.NewWebSocketEvent(model.WEBSOCKET_EVENT_EMOJI_ADDED, "", "", "", nil)
		message.Add("emoji", emoji.ToJson())

		a.Publish(message)
		return result.Data.(*model.Emoji), nil
	}
}

func (a *App) GetEmojiList(page, perPage int, sort string) ([]*model.Emoji, *model.AppError) {
	if result := <-a.Srv.Store.Emoji().GetList(page*perPage, perPage, sort); result.Err != nil {
		return nil, result.Err
	} else {
		return result.Data.([]*model.Emoji), nil
	}
}

func (a *App) 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 := a.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 := a.WriteFile(newbuf.Bytes(), getEmojiImagePath(id)); err != nil {
					return err
				}
			}
		}
	}

	return a.WriteFile(buf.Bytes(), getEmojiImagePath(id))
}

func (a *App) DeleteEmoji(emoji *model.Emoji) *model.AppError {
	if err := (<-a.Srv.Store.Emoji().Delete(emoji.Id, model.GetMillis())).Err; err != nil {
		return err
	}

	a.deleteEmojiImage(emoji.Id)
	a.deleteReactionsForEmoji(emoji.Name)
	return nil
}

func (a *App) GetEmoji(emojiId string) (*model.Emoji, *model.AppError) {
	if !*a.Config().ServiceSettings.EnableCustomEmoji {
		return nil, model.NewAppError("GetEmoji", "api.emoji.disabled.app_error", nil, "", http.StatusNotImplemented)
	}

	if len(*a.Config().FileSettings.DriverName) == 0 {
		return nil, model.NewAppError("GetEmoji", "api.emoji.storage.app_error", nil, "", http.StatusNotImplemented)
	}

	if result := <-a.Srv.Store.Emoji().Get(emojiId, false); result.Err != nil {
		return nil, result.Err
	} else {
		return result.Data.(*model.Emoji), nil
	}
}

func (a *App) GetEmojiByName(emojiName string) (*model.Emoji, *model.AppError) {
	if !*a.Config().ServiceSettings.EnableCustomEmoji {
		return nil, model.NewAppError("GetEmoji", "api.emoji.disabled.app_error", nil, "", http.StatusNotImplemented)
	}

	if len(*a.Config().FileSettings.DriverName) == 0 {
		return nil, model.NewAppError("GetEmoji", "api.emoji.storage.app_error", nil, "", http.StatusNotImplemented)
	}

	if result := <-a.Srv.Store.Emoji().GetByName(emojiName); result.Err != nil {
		return nil, result.Err
	} else {
		return result.Data.(*model.Emoji), nil
	}
}

func (a *App) GetEmojiImage(emojiId string) (imageByte []byte, imageType string, err *model.AppError) {
	if result := <-a.Srv.Store.Emoji().Get(emojiId, true); result.Err != nil {
		return nil, "", result.Err
	} else {
		var img []byte

		if data, err := a.ReadFile(getEmojiImagePath(emojiId)); err != nil {
			return nil, "", model.NewAppError("getEmojiImage", "api.emoji.get_image.read.app_error", nil, err.Error(), http.StatusNotFound)
		} else {
			img = data
		}

		_, imageType, err := image.DecodeConfig(bytes.NewReader(img))
		if err != nil {
			return nil, "", model.NewAppError("getEmojiImage", "api.emoji.get_image.decode.app_error", nil, err.Error(), http.StatusInternalServerError)
		}

		return img, imageType, nil
	}
}

func (a *App) SearchEmoji(name string, prefixOnly bool, limit int) ([]*model.Emoji, *model.AppError) {
	if !*a.Config().ServiceSettings.EnableCustomEmoji {
		return nil, model.NewAppError("SearchEmoji", "api.emoji.disabled.app_error", nil, "", http.StatusNotImplemented)
	}

	if result := <-a.Srv.Store.Emoji().Search(name, prefixOnly, limit); result.Err != nil {
		return nil, result.Err
	} else {
		return result.Data.([]*model.Emoji), 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
}

func (a *App) deleteEmojiImage(id string) {
	if err := a.MoveFile(getEmojiImagePath(id), "emoji/"+id+"/image_deleted"); err != nil {
		l4g.Error("Failed to rename image when deleting emoji %v", id)
	}
}

func (a *App) deleteReactionsForEmoji(emojiName string) {
	if result := <-a.Srv.Store.Reaction().DeleteAllWithEmojiName(emojiName); result.Err != nil {
		l4g.Warn(utils.T("api.emoji.delete.delete_reactions.app_error"), emojiName)
		l4g.Warn(result.Err)
	}
}