command for checking and setting api status

src/main/java/me/youhavetrouble/inviter/Main.java

@@ -1,6 +1,9 @@
 package me.youhavetrouble.inviter;
 
+import me.youhavetrouble.inviter.discord.command.ApiStatusChangeCommand;
+import me.youhavetrouble.inviter.discord.command.Command;
 import me.youhavetrouble.inviter.discord.listener.GuildJoinAndLeaveListener;
+import me.youhavetrouble.inviter.discord.listener.SlashCommandInteractionListener;
 import me.youhavetrouble.inviter.http.ApiServer;
 import me.youhavetrouble.inviter.discord.DiscordInviteManager;
 import me.youhavetrouble.inviter.storage.SqliteStorage;
@@ -76,11 +79,16 @@ public class Main {
 
         jda = JDABuilder.createLight(token, Set.of(GatewayIntent.GUILD_INVITES))
                 .setCallbackPool(Executors.newVirtualThreadPerTaskExecutor())
-                .addEventListeners(new GuildJoinAndLeaveListener())
+                .addEventListeners(
+                        new GuildJoinAndLeaveListener(),
+                        new SlashCommandInteractionListener()
+                )
                 .build();
 
         jda.awaitReady();
 
+        Command.registerCommand(new ApiStatusChangeCommand());
+
         jda.getGuilds().parallelStream().forEach(guild -> storage.saveDefaultGuildSettings(guild.getIdLong()));
 
         discordInviteManager = new DiscordInviteManager(jda);
@@ -92,7 +100,7 @@ public class Main {
             System.exit(1);
         }
 
-        LOGGER.info("Welcome to the Inviter Application!");
+        LOGGER.info("Inviter is up and running!");
     }
 
     public static JDA getJda() {

src/main/java/me/youhavetrouble/inviter/discord/command/ApiStatusChangeCommand.java

@@ -0,0 +1,67 @@
+package me.youhavetrouble.inviter.discord.command;
+
+import me.youhavetrouble.inviter.Main;
+import me.youhavetrouble.inviter.discord.GuildSettings;
+import net.dv8tion.jda.api.JDA;
+import net.dv8tion.jda.api.Permission;
+import net.dv8tion.jda.api.entities.Guild;
+import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
+import net.dv8tion.jda.api.interactions.IntegrationType;
+import net.dv8tion.jda.api.interactions.InteractionContextType;
+import net.dv8tion.jda.api.interactions.commands.DefaultMemberPermissions;
+import net.dv8tion.jda.api.interactions.commands.OptionMapping;
+import net.dv8tion.jda.api.interactions.commands.OptionType;
+import net.dv8tion.jda.api.interactions.commands.build.Commands;
+import net.dv8tion.jda.api.interactions.commands.build.OptionData;
+import org.jetbrains.annotations.Nullable;
+
+public class ApiStatusChangeCommand extends Command {
+
+    @Nullable
+    public String getName() {
+        return "api";
+    }
+
+    public void register(JDA jda, String name) {
+        jda.upsertCommand(Commands.slash("api", "Change if Inviter API should allow to retrieve this server's invites.")
+                .setIntegrationTypes(IntegrationType.GUILD_INSTALL)
+                .addOptions(
+                        new OptionData(OptionType.BOOLEAN, "status", "Status of the api availability for this guild", false)
+                )
+                .setContexts(InteractionContextType.GUILD)
+                .setDefaultPermissions(DefaultMemberPermissions.enabledFor(Permission.MANAGE_SERVER))
+        ).queue();
+    }
+
+    @Override
+    public void execute(SlashCommandInteractionEvent event) {
+        OptionMapping statusMapping = event.getOption("status");
+
+        Guild guild = event.getGuild();
+        if (guild == null) {
+            event.reply("This command can only be used in a guild.").setEphemeral(true).queue();
+            return;
+        }
+
+        event.deferReply(true).queue();
+
+        if (statusMapping == null) {
+            GuildSettings setings = Main.getStorage().getGuildSettings(guild.getIdLong());
+
+            String message = setings.apiEnabled() ?
+                "Inviter API is currently __**enabled**__ for this server." :
+                "Inviter API is currently __**disabled**__ for this server.";
+
+            event.getHook().editOriginal(message).queue();
+            return;
+        }
+
+        boolean status = statusMapping.getAsBoolean();
+        long guildId = guild.getIdLong();
+
+        Main.getStorage().updateDiscordApiEnabled(guildId, status);
+        String message = status ? "Inviter API is now __**enabled**__ for this server." : "Inviter API is now __**disabled**__ for this server.";
+        event.getHook().editOriginal(message).queue();
+    }
+
+}

src/main/java/me/youhavetrouble/inviter/discord/command/Command.java

@@ -0,0 +1,56 @@
+package me.youhavetrouble.inviter.discord.command;
+
+import me.youhavetrouble.inviter.Main;
+import net.dv8tion.jda.api.JDA;
+import net.dv8tion.jda.api.entities.User;
+import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
+import net.dv8tion.jda.api.hooks.ListenerAdapter;
+
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+
+public abstract class Command extends ListenerAdapter {
+
+    private static final Map<String, Command> commands = new HashMap<>();
+
+    public abstract void register(JDA jda, String name);
+
+    public abstract void execute(SlashCommandInteractionEvent event);
+
+    public abstract String getName();
+
+    boolean canUse(User user) {
+        return true;
+    }
+
+    public static void registerCommand(Command command) {
+        String name = command.getName();
+        if (commands.containsKey(name)) {
+            Main.LOGGER.warn("Command {} is already registered.", name);
+            return;
+        }
+        command.register(Main.getJda(), name);
+        commands.put(name, command);
+    }
+
+    public static void executeCommand(SlashCommandInteractionEvent event, String name) {
+        Command command = commands.get(name.toLowerCase(Locale.ENGLISH));
+        if (command == null) {
+            event.reply("Unknown command.")
+                    .setEphemeral(true)
+                    .queue();
+            return;
+        }
+
+        if (!command.canUse(event.getUser())) {
+            event.reply("You do not have permission to use this command.")
+                    .setEphemeral(true)
+                    .queue();
+            return;
+        }
+
+        command.execute(event);
+    }
+
+}

src/main/java/me/youhavetrouble/inviter/discord/listener/SlashCommandInteractionListener.java

@@ -0,0 +1,15 @@
+package me.youhavetrouble.inviter.discord.listener;
+
+import me.youhavetrouble.inviter.discord.command.Command;
+import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
+import net.dv8tion.jda.api.hooks.ListenerAdapter;
+
+public class SlashCommandInteractionListener extends ListenerAdapter {
+
+    @Override
+    public void onSlashCommandInteraction(SlashCommandInteractionEvent event) {
+        String command = event.getName();
+        Command.executeCommand(event, command);
+    }
+
+}