MM-54640 Add API to get multiple emojis by name at once (#24651)

* MM-54640 Add API to get multiple emojis by name at once

* Fix status code when too many names are requested

* Address feedback

* Update unit tests

* Fix styling

* Fix more styling

* Fix mismatched i18n id

server/channels/api4/emoji.go

@@ -17,11 +17,13 @@ import (
 
 const (
 	EmojiMaxAutocompleteItems = 100
+	GetEmojisByNamesMax       = 200
 )
 
 func (api *API) InitEmoji() {
 	api.BaseRoutes.Emojis.Handle("", api.APISessionRequired(createEmoji)).Methods("POST")
 	api.BaseRoutes.Emojis.Handle("", api.APISessionRequired(getEmojiList)).Methods("GET")
+	api.BaseRoutes.Emojis.Handle("/names", api.APISessionRequired(getEmojisByNames)).Methods("POST")
 	api.BaseRoutes.Emojis.Handle("/search", api.APISessionRequired(searchEmojis)).Methods("POST")
 	api.BaseRoutes.Emojis.Handle("/autocomplete", api.APISessionRequired(autocompleteEmojis)).Methods("GET")
 	api.BaseRoutes.Emoji.Handle("", api.APISessionRequired(deleteEmoji)).Methods("DELETE")
@@ -221,6 +223,11 @@ func getEmojiByName(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	if !*c.App.Config().ServiceSettings.EnableCustomEmoji {
+		c.Err = model.NewAppError("getEmojiByName", "api.emoji.disabled.app_error", nil, "", http.StatusNotImplemented)
+		return
+	}
+
 	emoji, err := c.App.GetEmojiByName(c.AppContext, c.Params.EmojiName)
 	if err != nil {
 		c.Err = err
@@ -232,6 +239,36 @@ func getEmojiByName(c *Context, w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func getEmojisByNames(c *Context, w http.ResponseWriter, r *http.Request) {
+	names := model.ArrayFromJSON(r.Body)
+	if len(names) == 0 {
+		c.SetInvalidParam("names")
+		return
+	}
+
+	if !*c.App.Config().ServiceSettings.EnableCustomEmoji {
+		c.Err = model.NewAppError("getEmojisByNames", "api.emoji.disabled.app_error", nil, "", http.StatusNotImplemented)
+		return
+	}
+
+	if len(names) > GetEmojisByNamesMax {
+		c.Err = model.NewAppError("getEmojisByNames", "api.emoji.get_multiple_by_name_too_many.request_error", map[string]any{
+			"MaxNames": GetEmojisByNamesMax,
+		}, "", http.StatusBadRequest)
+		return
+	}
+
+	emojis, err := c.App.GetMultipleEmojiByName(c.AppContext, names)
+	if err != nil {
+		c.Err = err
+		return
+	}
+
+	if err := json.NewEncoder(w).Encode(emojis); err != nil {
+		c.Logger.Warn("Error while writing response", mlog.Err(err))
+	}
+}
+
 func getEmojiImage(c *Context, w http.ResponseWriter, r *http.Request) {
 	c.RequireEmojiId()
 	if c.Err != nil {

server/channels/api4/emoji_test.go

@@ -280,6 +280,69 @@ func TestGetEmojiList(t *testing.T) {
 	require.Greater(t, len(listEmoji), 0, "should return more than 0")
 }
 
+func TestGetEmojisByNames(t *testing.T) {
+	th := Setup(t).InitBasic()
+	defer th.TearDown()
+
+	// Set up some custom emojis
+	adminClient := th.SystemAdminClient
+
+	imageBytes := utils.CreateTestJpeg(t, 10, 10)
+
+	emoji1 := &model.Emoji{
+		CreatorId: th.SystemAdminUser.Id,
+		Name:      model.NewId(),
+	}
+	emoji1, _, err := adminClient.CreateEmoji(context.Background(), emoji1, imageBytes, "emoji.jpg")
+	require.NoError(t, err)
+
+	emoji2 := &model.Emoji{
+		CreatorId: th.SystemAdminUser.Id,
+		Name:      model.NewId(),
+	}
+	emoji2, _, err = adminClient.CreateEmoji(context.Background(), emoji2, imageBytes, "emoji.jpg")
+	require.NoError(t, err)
+
+	client := th.Client
+
+	t.Run("should return a single emoji", func(t *testing.T) {
+		emojis, _, err := client.GetEmojisByNames(context.Background(), []string{emoji1.Name})
+
+		require.NoError(t, err)
+		require.Len(t, emojis, 1)
+		assert.Equal(t, emoji1.Id, emojis[0].Id)
+	})
+
+	t.Run("should return multiple emojis", func(t *testing.T) {
+		emojis, _, err := client.GetEmojisByNames(context.Background(), []string{emoji1.Name, emoji2.Name})
+
+		require.NoError(t, err)
+		require.Len(t, emojis, 2)
+		assert.Equal(t, emoji1.Id, emojis[0].Id)
+		assert.Equal(t, emoji2.Id, emojis[1].Id)
+	})
+
+	t.Run("should ignore non-existent emojis", func(t *testing.T) {
+		emojis, _, err := client.GetEmojisByNames(context.Background(), []string{emoji1.Name, emoji2.Name, model.NewId()})
+
+		require.NoError(t, err)
+		require.Len(t, emojis, 2)
+		assert.Equal(t, emoji1.Id, emojis[0].Id)
+		assert.Equal(t, emoji2.Id, emojis[1].Id)
+	})
+
+	t.Run("should return an error when too many emojis are requested", func(t *testing.T) {
+		names := make([]string, GetEmojisByNamesMax+1)
+		for i := 0; i < len(names); i++ {
+			names[i] = emoji1.Name
+		}
+
+		_, _, err := client.GetEmojisByNames(context.Background(), names)
+
+		require.Error(t, err)
+	})
+}
+
 func TestDeleteEmoji(t *testing.T) {
 	th := Setup(t).InitBasic()
 	defer th.TearDown()