Middlewares

Explore how Sunar enhances your discord bot's functionality with middleware support.

Protectors

Protectors in Sunar act as middleware, allowing you to intercept and control the flow of commands and interactions within your Discord bot. They provide a flexible way to enforce permissions, validate inputs, or perform pre-processing before executing commands.

Create the protector logic

Create a file only-admins.js in the directory src/protectors/. This file defines a protector onlyAdmins that checks if the user has administrator permissions.

src/protectors/only-admins.js

import { PermissionFlagsBits } from 'discord.js';
import { Protector, execute } from 'sunar';

const onlyAdmins = new Protector({
	commands: ['slash'],
	signals: ['interactionCreate'],
});

const content = 'This command can only be used by administrators';

function checkIsAdmin(permissions) {
	if (!permissions) return false;
	return permissions.has(PermissionFlagsBits.Administrator);
}

execute(onlyAdmins, (arg, next) => {
	const entry = Array.isArray(arg) ? arg[0] : arg;
	const isAdmin = checkIsAdmin(entry.memberPermissions);

	if (entry.isRepliable() && !isAdmin) {
		return entry.reply({ content, ephemeral: true });
	}

	return isAdmin && next();
});

export { onlyAdmins };

When creating a Protector instance, specify the commands, signals, or components that will use this protector. This allows precise control over the arguments received through function parameters.

Create a protected command

Create a file protected.js in the directory src/commands/. This file defines a Slash command named protected that is protected by the onlyAdmins protector. Only administrators can execute this command, and it replies with a message indicating the user is an administrator.

src/commands/protected.js

import { Slash, execute, protect } from 'sunar';

import { onlyAdmins } from '../protectors/only-admins.js';

const slash = new Slash({
	name: 'protected',
	description: 'This is a protected slash command',
});

protect(slash, [onlyAdmins]);

execute(slash, (interaction) => {
	interaction.reply({ content: 'You are an admin!' });
});

export { slash };

File structure

Here's an overview of the project's file structure to help you visualize how files are organized in this example.

protected.js

only-admins.js

index.js

Protectors

Create the protector logic

Create a protected command

File structure

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