ABC-90 Add POST /emoji/search and GET /emoji/autocomplete API endpoints (#8125)

* Add POST /emoji/search and GET /emoji/autocomplete API endpoints

* Add constant to be clearer

api4/emoji.go

@@ -11,9 +11,15 @@ import (
 	"github.com/mattermost/mattermost-server/model"
 )
 
+const (
+	EMOJI_MAX_AUTOCOMPLETE_ITEMS = 100
+)
+
 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("/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")
 	api.BaseRoutes.Emoji.Handle("", api.ApiSessionRequired(getEmoji)).Methods("GET")
 	api.BaseRoutes.Emoji.Handle("/image", api.ApiSessionRequiredTrustRequester(getEmojiImage)).Methods("GET")
@@ -162,3 +168,41 @@ func getEmojiImage(c *Context, w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Cache-Control", "max-age=2592000, public")
 	w.Write(image)
 }
+
+func searchEmojis(c *Context, w http.ResponseWriter, r *http.Request) {
+	emojiSearch := model.EmojiSearchFromJson(r.Body)
+	if emojiSearch == nil {
+		c.SetInvalidParam("term")
+		return
+	}
+
+	if emojiSearch.Term == "" {
+		c.SetInvalidParam("term")
+		return
+	}
+
+	emojis, err := c.App.SearchEmoji(emojiSearch.Term, emojiSearch.PrefixOnly, PER_PAGE_MAXIMUM)
+	if err != nil {
+		c.Err = err
+		return
+	} else {
+		w.Write([]byte(model.EmojiListToJson(emojis)))
+	}
+}
+
+func autocompleteEmojis(c *Context, w http.ResponseWriter, r *http.Request) {
+	name := r.URL.Query().Get("name")
+
+	if name == "" {
+		c.SetInvalidUrlParam("name")
+		return
+	}
+
+	emojis, err := c.App.SearchEmoji(name, true, EMOJI_MAX_AUTOCOMPLETE_ITEMS)
+	if err != nil {
+		c.Err = err
+		return
+	} else {
+		w.Write([]byte(model.EmojiListToJson(emojis)))
+	}
+}