verify the state of invites enabled setting

src/main/java/me/youhavetrouble/inviter/http/endpoints/GetDiscordInviteByGuildId.java

@@ -4,6 +4,7 @@ import com.sun.net.httpserver.HttpExchange;
 import me.youhavetrouble.inviter.discord.DiscordInvite;
 import me.youhavetrouble.inviter.Main;
 import me.youhavetrouble.inviter.discord.DiscordInviteManager;
+import me.youhavetrouble.inviter.discord.GuildSettings;
 import org.jetbrains.annotations.NotNull;
 
 import java.io.IOException;
@@ -39,6 +40,7 @@ public class GetDiscordInviteByGuildId implements EndpointHandler {
         }
 
         DiscordInviteManager inviteManager = Main.getDiscordInviteMenager();
+        GuildSettings settings = Main.getStorage().getGuildSettings(guildIdLong);
         DiscordInvite invite = inviteManager.getInvite(guildIdLong);
 
         if (invite == null) {
@@ -46,6 +48,11 @@ public class GetDiscordInviteByGuildId implements EndpointHandler {
             return;
         }
 
+        if (!settings.invitesEnabled()) {
+            exchange.sendResponseHeaders(401, -1); // Not Found
+            return;
+        }
+
         String inviteUrl = "https://discord.gg/" + invite.code();
 
         switch (exchange.getRequestHeaders().getFirst("Accept")) {