adds back reaction listener ....

cmd/welcomebot/main.go

@@ -49,6 +49,7 @@ func main() {
 		),
 		bot.WithEventListenerFunc(joinListener),
 		bot.WithEventListenerFunc(leaveListener),
+		bot.WithEventListenerFunc(reactionListener),
 	)
 	if err != nil {
 		log.Fatal("error while building disgo instance: ", err)
@@ -154,3 +155,89 @@ func leaveListener(event *events.GuildMemberLeave) {
 		return
 	}
 }
+
+func reactionListener(event *events.ComponentInteractionCreate) {
+
+	if event.ChannelID() != channelWelcomeID {
+		// reaction is not in welcome chat
+		return
+	}
+
+	approverID := event.User().ID
+	if approverID.String() == event.Client().ID().String() {
+		// reaction user is bot itself
+		return
+	}
+	if event.ButtonInteractionData().CustomID() != "approve" {
+		// not approve button
+		return
+	}
+	approver, err := event.Client().Rest().GetMember(registerGuildID, approverID)
+	if err != nil {
+		event.Client().Logger().Error("could not find user: ", err)
+		return
+	}
+	hasPermission := func() bool {
+		for _, roleID := range approver.RoleIDs {
+			if roleID.String() == roleAppleCoreID.String() {
+				return true
+			}
+		}
+		return false
+	}()
+
+	if hasPermission == false {
+		err = event.CreateMessage(discord.NewMessageCreateBuilder().
+			SetEphemeral(true).
+			SetContent("you don't have permissions to do this").
+			Build())
+		if err != nil {
+			event.Client().Logger().Error("could not respond to reaction: ", err)
+			return
+		}
+		return
+	}
+
+	messageID := event.Message.ID
+	message, err := event.Client().Rest().GetMessage(channelWelcomeID, messageID)
+	if err != nil {
+		event.Client().Logger().Error("could not find message: ", err)
+		return
+	}
+	if len(message.Mentions) != 1 {
+		// there should be only one mention in the message
+		return
+	}
+	user := message.Mentions[0]
+
+	// add role to user (bot role needs to be above roleAppleID)
+	err = event.Client().Rest().AddMemberRole(registerGuildID, user.ID, roleAppleID)
+	if err != nil {
+		event.Client().Logger().Error("not able to add role: ", err)
+		return
+	}
+
+	// update embed (and time)
+	if len(message.Embeds) != 1 {
+		// there should be only one embed in the message
+		return
+	}
+	embed := message.Embeds[0]
+	updatedMessage := discord.NewEmbedBuilder().
+		SetColor(16068661).
+		SetTimestamp(time.Now()).
+		SetThumbnail(embed.Thumbnail.URL).
+		AddFields(embed.Fields...).
+		AddField("Approval", fmt.Sprintf("%v approved by %v (`%v`)", user.Mention(), approver.Mention(), approver.User.Username), false).
+		Build()
+
+	err = event.UpdateMessage(discord.NewMessageUpdateBuilder().
+		SetContent(message.Content).
+		SetEmbeds(updatedMessage).
+		ClearContainerComponents().
+		Build())
+	if err != nil {
+		event.Client().Logger().Error("could not update message: ", err)
+		return
+	}
+}