PLT-3145 Custom Emojis (#3381)

* Reorganized Backstage code to use a view controller and separated it from integrations code

* Renamed InstalledIntegrations component to BackstageList

* Added EmojiList page

* Added AddEmoji page

* Added custom emoji to autocomplete and text formatter

* Moved system emoji to EmojiStore

* Stopped trying to get emoji before logging in

* Rerender posts when emojis change

* Fixed submit handler on backstage pages to properly support enter

* Removed debugging code

* Updated javascript driver

* Fixed unit tests

* Fixed backstage routes

* Added clientside validation to prevent users from creating an emoji with the same name as a system one

* Fixed AddEmoji page to properly redirect when an emoji is created successfully

* Fixed updating emoji list when an emoji is deleted

* Added type prop to BackstageList to properly support using a table for the list

* Added help text to EmojiList

* Fixed backstage on smaller screen sizes

* Disable custom emoji by default

* Improved restrictions on creating emojis

* Fixed non-admin users seeing the option to delete each other's emojis

* Fixing gofmt

* Fixed emoji unit tests

* Fixed trying to get emoji from the server when it's disabled

api/emoji.go

@@ -16,6 +16,7 @@ import (
 
 	l4g "github.com/alecthomas/log4go"
 	"github.com/gorilla/mux"
+	"github.com/mattermost/platform/einterfaces"
 	"github.com/mattermost/platform/model"
 	"github.com/mattermost/platform/utils"
 )
@@ -32,7 +33,7 @@ func InitEmoji() {
 	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_]+}", ApiUserRequired(getEmojiImage)).Methods("GET")
+	BaseRoutes.Emoji.Handle("/{id:[A-Za-z0-9_]+}", ApiUserRequiredTrustRequester(getEmojiImage)).Methods("GET")
 }
 
 func getEmoji(c *Context, w http.ResponseWriter, r *http.Request) {
@@ -58,7 +59,8 @@ func createEmoji(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if !(*utils.Cfg.ServiceSettings.RestrictCustomEmojiCreation == model.RESTRICT_EMOJI_CREATION_ALL || c.IsSystemAdmin()) {
+	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