Feature: emoji editor (#2411)

* Custom emoji editor: implement backend

This reuses the logo upload code

* Implement emoji edit admin interface

Again reuse base64 logic from the logo upload

* Allow toggling between uploaded and default emojis

* Add route that always serves uploaded emojis

This is needed for the admin emoji interface,
as otherwise the emojis will 404 if custom emojis are disabled

* Fix linter warnings

* Remove custom/uploaded emoji logic

* Reset timer after emoji deletion

* Setup: copy built-in emojis to emoji directory

config/constants.go

@@ -9,8 +9,8 @@ const (
 	FfmpegSuggestedVersion = "v4.1.5" // Requires the v
 	// DataDirectory is the directory we save data to.
 	DataDirectory = "data"
-	// EmojiDir is relative to the static directory.
-	EmojiDir = "/img/emoji"
+	// EmojiDir defines the URL route prefix for emoji requests.
+	EmojiDir = "/img/emoji/"
 	// MaxUserColor is the largest color value available to assign to users.
 	// They start at 0 and can be treated as IDs more than colors themselves.
 	MaxUserColor = 7
@@ -25,6 +25,6 @@ var (
 	// HLSStoragePath is the directory HLS video is written to.
 	HLSStoragePath = filepath.Join(DataDirectory, "hls")
 
-	// CustomEmojiPath is the optional emoji override directory.
+	// CustomEmojiPath is the emoji directory.
 	CustomEmojiPath = filepath.Join(DataDirectory, "emoji")
 )

controllers/admin/config.go

@@ -1,7 +1,6 @@
 package admin
 
 import (
-	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"net"
@@ -228,39 +227,12 @@ func SetLogo(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	s := strings.SplitN(configValue.Value.(string), ",", 2)
-	if len(s) < 2 {
-		controllers.WriteSimpleResponse(w, false, "Error splitting base64 image data.")
-		return
-	}
-	bytes, err := base64.StdEncoding.DecodeString(s[1])
+	bytes, extension, err := utils.DecodeBase64Image(configValue.Value.(string))
 	if err != nil {
 		controllers.WriteSimpleResponse(w, false, err.Error())
 		return
 	}
 
-	splitHeader := strings.Split(s[0], ":")
-	if len(splitHeader) < 2 {
-		controllers.WriteSimpleResponse(w, false, "Error splitting base64 image header.")
-		return
-	}
-	contentType := strings.Split(splitHeader[1], ";")[0]
-	extension := ""
-	if contentType == "image/svg+xml" {
-		extension = ".svg"
-	} else if contentType == "image/gif" {
-		extension = ".gif"
-	} else if contentType == "image/png" {
-		extension = ".png"
-	} else if contentType == "image/jpeg" {
-		extension = ".jpeg"
-	}
-
-	if extension == "" {
-		controllers.WriteSimpleResponse(w, false, "Missing or invalid contentType in base64 image.")
-		return
-	}
-
 	imgPath := filepath.Join("data", "logo"+extension)
 	if err := os.WriteFile(imgPath, bytes, 0o600); err != nil {
 		controllers.WriteSimpleResponse(w, false, err.Error())

controllers/admin/emoji.go

@@ -0,0 +1,92 @@
+package admin
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os"
+	"path/filepath"
+
+	"github.com/owncast/owncast/config"
+	"github.com/owncast/owncast/controllers"
+	"github.com/owncast/owncast/utils"
+)
+
+// UploadCustomEmoji allows POSTing a new custom emoji to the server.
+func UploadCustomEmoji(w http.ResponseWriter, r *http.Request) {
+	if !requirePOST(w, r) {
+		return
+	}
+
+	type postEmoji struct {
+		Name string `json:"name"`
+		Data string `json:"data"`
+	}
+
+	emoji := new(postEmoji)
+
+	if err := json.NewDecoder(r.Body).Decode(emoji); err != nil {
+		controllers.WriteSimpleResponse(w, false, err.Error())
+		return
+	}
+
+	bytes, _, err := utils.DecodeBase64Image(emoji.Data)
+	if err != nil {
+		controllers.WriteSimpleResponse(w, false, err.Error())
+		return
+	}
+
+	// Prevent path traversal attacks
+	var emojiFileName = filepath.Base(emoji.Name)
+	var targetPath = filepath.Join(config.CustomEmojiPath, emojiFileName)
+
+	err = os.MkdirAll(config.CustomEmojiPath, 0700)
+	if err != nil {
+		controllers.WriteSimpleResponse(w, false, err.Error())
+		return
+	}
+
+	if utils.DoesFileExists(targetPath) {
+		controllers.WriteSimpleResponse(w, false, fmt.Sprintf("An emoji with the name %q already exists", emojiFileName))
+		return
+	}
+
+	if err = os.WriteFile(targetPath, bytes, 0o600); err != nil {
+		controllers.WriteSimpleResponse(w, false, err.Error())
+		return
+	}
+
+	controllers.WriteSimpleResponse(w, true, fmt.Sprintf("Emoji %q has been uploaded", emojiFileName))
+}
+
+// DeleteCustomEmoji deletes a custom emoji.
+func DeleteCustomEmoji(w http.ResponseWriter, r *http.Request) {
+	if !requirePOST(w, r) {
+		return
+	}
+
+	type deleteEmoji struct {
+		Name string `json:"name"`
+	}
+
+	emoji := new(deleteEmoji)
+
+	if err := json.NewDecoder(r.Body).Decode(emoji); err != nil {
+		controllers.WriteSimpleResponse(w, false, err.Error())
+		return
+	}
+
+	var emojiFileName = filepath.Base(emoji.Name)
+	var targetPath = filepath.Join(config.CustomEmojiPath, emojiFileName)
+
+	if err := os.Remove(targetPath); err != nil {
+		if os.IsNotExist(err) {
+			controllers.WriteSimpleResponse(w, false, fmt.Sprintf("Emoji %q doesn't exist", emojiFileName))
+		} else {
+			controllers.WriteSimpleResponse(w, false, err.Error())
+		}
+		return
+	}
+
+	controllers.WriteSimpleResponse(w, true, fmt.Sprintf("Emoji %q has been deleted", emojiFileName))
+}

controllers/emoji.go

@@ -2,50 +2,17 @@ package controllers
 
 import (
 	"encoding/json"
-	"io/fs"
 	"net/http"
 	"os"
-	"path/filepath"
 	"strings"
 
 	"github.com/owncast/owncast/config"
-	"github.com/owncast/owncast/models"
-	"github.com/owncast/owncast/static"
-	"github.com/owncast/owncast/utils"
-	log "github.com/sirupsen/logrus"
+	"github.com/owncast/owncast/core/data"
 )
 
-var useCustomEmojiDirectory = utils.DoesFileExists(config.CustomEmojiPath)
-
-// getCustomEmojiList returns a list of custom emoji either from the cache or from the emoji directory.
-func getCustomEmojiList() []models.CustomEmoji {
-	var emojiFS fs.FS
-	if useCustomEmojiDirectory {
-		emojiFS = os.DirFS(config.CustomEmojiPath)
-	} else {
-		emojiFS = static.GetEmoji()
-	}
-
-	emojiResponse := make([]models.CustomEmoji, 0)
-
-	files, err := fs.Glob(emojiFS, "*")
-	if err != nil {
-		log.Errorln(err)
-		return emojiResponse
-	}
-
-	for _, name := range files {
-		emojiPath := filepath.Join(config.EmojiDir, name)
-		singleEmoji := models.CustomEmoji{Name: name, URL: emojiPath}
-		emojiResponse = append(emojiResponse, singleEmoji)
-	}
-
-	return emojiResponse
-}
-
-// GetCustomEmojiList returns a list of custom emoji via the API.
+// GetCustomEmojiList returns a list of emoji via the API.
 func GetCustomEmojiList(w http.ResponseWriter, r *http.Request) {
-	emojiList := getCustomEmojiList()
+	emojiList := data.GetEmojiList()
 
 	if err := json.NewEncoder(w).Encode(emojiList); err != nil {
 		InternalErrorHandler(w, err)
@@ -57,13 +24,6 @@ func GetCustomEmojiImage(w http.ResponseWriter, r *http.Request) {
 	path := strings.TrimPrefix(r.URL.Path, "/img/emoji/")
 	r.URL.Path = path
 
-	var emojiStaticServer http.Handler
-	if useCustomEmojiDirectory {
-		emojiFS := os.DirFS(config.CustomEmojiPath)
-		emojiStaticServer = http.FileServer(http.FS(emojiFS))
-	} else {
-		emojiStaticServer = http.FileServer(http.FS(static.GetEmoji()))
-	}
-
-	emojiStaticServer.ServeHTTP(w, r)
+	emojiFS := os.DirFS(config.CustomEmojiPath)
+	http.FileServer(http.FS(emojiFS)).ServeHTTP(w, r)
 }

core/data/emoji.go

@@ -0,0 +1,84 @@
+package data
+
+import (
+	"fmt"
+	"io"
+	"io/fs"
+	"os"
+	"path/filepath"
+
+	"github.com/owncast/owncast/config"
+	"github.com/owncast/owncast/models"
+	"github.com/owncast/owncast/static"
+	"github.com/owncast/owncast/utils"
+	log "github.com/sirupsen/logrus"
+)
+
+// GetEmojiList returns a list of custom emoji from the emoji directory.
+func GetEmojiList() []models.CustomEmoji {
+	var emojiFS = os.DirFS(config.CustomEmojiPath)
+
+	emojiResponse := make([]models.CustomEmoji, 0)
+
+	files, err := fs.Glob(emojiFS, "*")
+	if err != nil {
+		log.Errorln(err)
+		return emojiResponse
+	}
+
+	for _, name := range files {
+		emojiPath := filepath.Join(config.EmojiDir, name)
+		singleEmoji := models.CustomEmoji{Name: name, URL: emojiPath}
+		emojiResponse = append(emojiResponse, singleEmoji)
+	}
+
+	return emojiResponse
+}
+
+// SetupEmojiDirectory sets up the custom emoji directory by copying all built-in
+// emojis if the directory does not yet exist.
+func SetupEmojiDirectory() (err error) {
+	if utils.DoesFileExists(config.CustomEmojiPath) {
+		return nil
+	}
+
+	if err = os.MkdirAll(config.CustomEmojiPath, 0o750); err != nil {
+		return fmt.Errorf("unable to create custom emoji directory: %w", err)
+	}
+
+	staticFS := static.GetEmoji()
+	files, err := fs.Glob(staticFS, "*")
+	if err != nil {
+		return fmt.Errorf("unable to read built-in emoji files: %w", err)
+	}
+
+	// Now copy all built-in emojis to the custom emoji directory
+	for _, name := range files {
+		emojiPath := filepath.Join(config.CustomEmojiPath, filepath.Base(name))
+
+		// nolint:gosec
+		diskFile, err := os.Create(emojiPath)
+		if err != nil {
+			return fmt.Errorf("unable to create custom emoji file on disk: %w", err)
+		}
+
+		memFile, err := staticFS.Open(name)
+		if err != nil {
+			_ = diskFile.Close()
+			return fmt.Errorf("unable to open built-in emoji file: %w", err)
+		}
+
+		if _, err = io.Copy(diskFile, memFile); err != nil {
+			_ = diskFile.Close()
+			_ = os.Remove(emojiPath)
+			return fmt.Errorf("unable to copy built-in emoji file to disk: %w", err)
+		}
+
+		if err = diskFile.Close(); err != nil {
+			_ = os.Remove(emojiPath)
+			return fmt.Errorf("unable to close custom emoji file on disk: %w", err)
+		}
+	}
+
+	return nil
+}

main.go

@@ -47,6 +47,10 @@ func main() {
 			log.Fatalln("Cannot create data directory", err)
 		}
 	}
+	// Set up emoji directory
+	if err := data.SetupEmojiDirectory(); err != nil {
+		log.Fatalln("Cannot set up emoji directory", err)
+	}
 
 	// Recreate the temp dir
 	if utils.DoesFileExists(config.TempDir) {

router/router.go

@@ -39,7 +39,7 @@ func Start() error {
 	http.HandleFunc("/logo", controllers.GetLogo)
 
 	// Return a single emoji image.
-	http.HandleFunc("/img/emoji/", controllers.GetCustomEmojiImage)
+	http.HandleFunc(config.EmojiDir, controllers.GetCustomEmojiImage)
 
 	// return the logo
 
@@ -156,6 +156,12 @@ func Start() error {
 	// Set the following state of a follower or follow request.
 	http.HandleFunc("/api/admin/followers/approve", middleware.RequireAdminAuth(admin.ApproveFollower))
 
+	// Upload custom emoji
+	http.HandleFunc("/api/admin/emoji/upload", middleware.RequireAdminAuth(admin.UploadCustomEmoji))
+
+	// Delete custom emoji
+	http.HandleFunc("/api/admin/emoji/delete", middleware.RequireAdminAuth(admin.DeleteCustomEmoji))
+
 	// Update config values
 
 	// Change the current streaming key in memory

utils/utils.go

@@ -2,6 +2,7 @@ package utils
 
 import (
 	"bytes"
+	"encoding/base64"
 	"errors"
 	"fmt"
 	"io"
@@ -364,3 +365,42 @@ func ShuffleStringSlice(s []string) []string {
 func IntPercentage(x, total int) int {
 	return int(float64(x) / float64(total) * 100)
 }
+
+// DecodeBase64Image decodes a base64 image string into a byte array, returning the extension (including dot) for the content type.
+func DecodeBase64Image(url string) (bytes []byte, extension string, err error) {
+	s := strings.SplitN(url, ",", 2)
+	if len(s) < 2 {
+		err = errors.New("error splitting base64 image data")
+		return
+	}
+
+	bytes, err = base64.StdEncoding.DecodeString(s[1])
+	if err != nil {
+		return
+	}
+
+	splitHeader := strings.Split(s[0], ":")
+	if len(splitHeader) < 2 {
+		err = errors.New("error splitting base64 image header")
+		return
+	}
+
+	contentType := strings.Split(splitHeader[1], ";")[0]
+
+	if contentType == "image/svg+xml" {
+		extension = ".svg"
+	} else if contentType == "image/gif" {
+		extension = ".gif"
+	} else if contentType == "image/png" {
+		extension = ".png"
+	} else if contentType == "image/jpeg" {
+		extension = ".jpeg"
+	}
+
+	if extension == "" {
+		err = errors.New("missing or invalid contentType in base64 image")
+		return
+	}
+
+	return bytes, extension, nil
+}

web/components/MainLayout.tsx

@@ -143,6 +143,10 @@ export const MainLayout: FC<MainLayoutProps> = ({ children }) => {
       label: <Link href="/admin/chat/users">Users</Link>,
       key: 'chat-users',
     },
+    {
+      label: <Link href="/admin/chat/emojis">Emojis</Link>,
+      key: 'emojis',
+    },
   ];
 
   const utilitiesMenu = [

web/components/config/EditLogo.tsx

@@ -18,13 +18,7 @@ import {
 } from '../../utils/input-statuses';
 import { NEXT_PUBLIC_API_HOST } from '../../utils/apis';
 
-const ACCEPTED_FILE_TYPES = ['image/png', 'image/jpeg', 'image/gif'];
-
-function getBase64(img: File | Blob, callback: (imageUrl: string | ArrayBuffer) => void) {
-  const reader = new FileReader();
-  reader.addEventListener('load', () => callback(reader.result));
-  reader.readAsDataURL(img);
-}
+import { ACCEPTED_IMAGE_TYPES, getBase64 } from '../../utils/images';
 
 export const EditLogo: FC = () => {
   const [logoUrl, setlogoUrl] = useState(null);
@@ -53,7 +47,7 @@ export const EditLogo: FC = () => {
 
     // eslint-disable-next-line consistent-return
     return new Promise<void>((res, rej) => {
-      if (!ACCEPTED_FILE_TYPES.includes(file.type)) {
+      if (!ACCEPTED_IMAGE_TYPES.includes(file.type)) {
         const msg = `File type is not supported: ${file.type}`;
         setSubmitStatus(createInputStatus(STATUS_ERROR, `There was an error: ${msg}`));
         resetTimer = setTimeout(resetStates, RESET_TIMEOUT);
@@ -108,7 +102,7 @@ export const EditLogo: FC = () => {
             listType="picture"
             className="avatar-uploader"
             showUploadList={false}
-            accept={ACCEPTED_FILE_TYPES.join(',')}
+            accept={ACCEPTED_IMAGE_TYPES.join(',')}
             beforeUpload={beforeUpload}
             customRequest={handleLogoUpdate}
             disabled={loading}

web/pages/admin/chat/emojis.tsx

@@ -0,0 +1,183 @@
+import { DeleteOutlined } from '@ant-design/icons';
+import { Button, Space, Table, Typography, Upload } from 'antd';
+import { RcFile } from 'antd/lib/upload';
+import React, { useEffect, useState } from 'react';
+import FormStatusIndicator from '../../../components/config/FormStatusIndicator';
+
+import { DELETE_EMOJI, fetchData, UPLOAD_EMOJI } from '../../../utils/apis';
+
+import { ACCEPTED_IMAGE_TYPES, getBase64 } from '../../../utils/images';
+import {
+  createInputStatus,
+  STATUS_ERROR,
+  STATUS_PROCESSING,
+  STATUS_SUCCESS,
+} from '../../../utils/input-statuses';
+import { RESET_TIMEOUT } from '../../../utils/config-constants';
+import { URL_CUSTOM_EMOJIS } from '../../../utils/constants';
+
+type CustomEmoji = {
+  name: string;
+  url: string;
+};
+
+const { Title, Paragraph } = Typography;
+
+const Emoji = () => {
+  const [emojis, setEmojis] = useState<CustomEmoji[]>([]);
+
+  const [loading, setLoading] = useState(false);
+  const [submitStatus, setSubmitStatus] = useState(null);
+  const [uploadFile, setUploadFile] = useState<RcFile>(null);
+
+  let resetTimer = null;
+  const resetStates = () => {
+    setSubmitStatus(null);
+    clearTimeout(resetTimer);
+    resetTimer = null;
+  };
+
+  async function getEmojis() {
+    setLoading(true);
+    try {
+      const response = await fetchData(URL_CUSTOM_EMOJIS);
+      setEmojis(response);
+    } catch (error) {
+      console.error('error fetching emojis', error);
+    }
+    setLoading(false);
+  }
+  useEffect(() => {
+    getEmojis();
+  }, []);
+
+  async function handleDelete(name: string) {
+    setLoading(true);
+
+    setSubmitStatus(createInputStatus(STATUS_PROCESSING, 'Deleting emoji...'));
+
+    try {
+      const response = await fetchData(DELETE_EMOJI, {
+        method: 'POST',
+        data: { name },
+      });
+
+      if (response instanceof Error) {
+        throw response;
+      }
+
+      setSubmitStatus(createInputStatus(STATUS_SUCCESS, 'Emoji deleted'));
+      resetTimer = setTimeout(resetStates, RESET_TIMEOUT);
+    } catch (error) {
+      setSubmitStatus(createInputStatus(STATUS_ERROR, `${error}`));
+      setLoading(false);
+      resetTimer = setTimeout(resetStates, RESET_TIMEOUT);
+    }
+
+    getEmojis();
+  }
+
+  async function handleEmojiUpload() {
+    setLoading(true);
+    try {
+      setSubmitStatus(createInputStatus(STATUS_PROCESSING, 'Converting emoji...'));
+
+      // eslint-disable-next-line consistent-return
+      const emojiData = await new Promise<CustomEmoji>((res, rej) => {
+        if (!ACCEPTED_IMAGE_TYPES.includes(uploadFile.type)) {
+          const msg = `File type is not supported: ${uploadFile.type}`;
+          // eslint-disable-next-line no-promise-executor-return
+          return rej(msg);
+        }
+
+        getBase64(uploadFile, (url: string) =>
+          res({
+            name: uploadFile.name,
+            url,
+          }),
+        );
+      });
+
+      setSubmitStatus(createInputStatus(STATUS_PROCESSING, 'Uploading emoji...'));
+
+      const response = await fetchData(UPLOAD_EMOJI, {
+        method: 'POST',
+        data: {
+          name: emojiData.name,
+          data: emojiData.url,
+        },
+      });
+
+      if (response instanceof Error) {
+        throw response;
+      }
+
+      setSubmitStatus(createInputStatus(STATUS_SUCCESS, 'Emoji uploaded successfully!'));
+      getEmojis();
+    } catch (error) {
+      setSubmitStatus(createInputStatus(STATUS_ERROR, `${error}`));
+    }
+
+    resetTimer = setTimeout(resetStates, RESET_TIMEOUT);
+    setLoading(false);
+  }
+
+  const columns = [
+    {
+      title: '',
+      key: 'delete',
+      render: (text, record) => (
+        <Space size="middle">
+          <Button onClick={() => handleDelete(record.name)} icon={<DeleteOutlined />} />
+        </Space>
+      ),
+    },
+    {
+      title: 'Name',
+      key: 'name',
+      dataIndex: 'name',
+    },
+    {
+      title: 'Emoji',
+      key: 'url',
+      render: (text, record) => (
+        <img src={record.url} alt={record.name} style={{ maxWidth: '2vw' }} />
+      ),
+    },
+  ];
+
+  return (
+    <div>
+      <Title>Emojis</Title>
+      <Paragraph>
+        Here you can upload new custom emojis for usage in the chat. When uploading a new emoji, the
+        filename will be used as emoji name.
+      </Paragraph>
+
+      <Table
+        rowKey={record => record.url}
+        dataSource={emojis}
+        columns={columns}
+        pagination={false}
+      />
+      <br />
+      <Upload
+        name="emoji"
+        listType="picture"
+        className="emoji-uploader"
+        showUploadList={false}
+        accept={ACCEPTED_IMAGE_TYPES.join(',')}
+        beforeUpload={setUploadFile}
+        customRequest={handleEmojiUpload}
+        disabled={loading}
+      >
+        <Button type="primary" disabled={loading}>
+          Upload new emoji
+        </Button>
+      </Upload>
+      <FormStatusIndicator status={submitStatus} />
+    </div>
+  );
+};
+
+export default Emoji;

web/utils/apis.ts

@@ -64,6 +64,12 @@ export const CHAT_HISTORY = `${API_LOCATION}chat/messages`;
 // Get chat history
 export const UPDATE_CHAT_MESSGAE_VIZ = `/api/admin/chat/messagevisibility`;
 
+// Upload a new custom emoji
+export const UPLOAD_EMOJI = `${API_LOCATION}emoji/upload`;
+
+// Delete a custom emoji
+export const DELETE_EMOJI = `${API_LOCATION}emoji/delete`;
+
 // Get all access tokens
 export const ACCESS_TOKENS = `${API_LOCATION}accesstokens`;
 

web/utils/images.ts

@@ -0,0 +1,7 @@
+export const ACCEPTED_IMAGE_TYPES = ['image/png', 'image/jpeg', 'image/gif'];
+
+export function getBase64(img: File | Blob, callback: (imageUrl: string | ArrayBuffer) => void) {
+  const reader = new FileReader();
+  reader.addEventListener('load', () => callback(reader.result));
+  reader.readAsDataURL(img);
+}