is-discord-invite/scripts/sendHttpRequest.js

Verifies the presence of a Discord server invitation in a given string or message, with additional features for validating and confirming the authenticity and validity of the invitation link.

const https = require('node:https');
const { name, version, devDependencies } = require('../package.json');

const testRunnerVersion = process.env.JEST_WORKER_ID === undefined ? '' : ` jest/${devDependencies.jest.replace('^', '')}`;
const headers = {
	'User-Agent': `${name}/${version} (+https://github.com/sefinek/is-discord-invite)${testRunnerVersion}`,
	'Accept': 'application/json',
};

const extractCode = discordLink => {
	try {
		const parsedUrl = new URL(discordLink);
		const pathname = parsedUrl.pathname;

		return pathname.startsWith('/invite/') ? pathname.substring('/invite/'.length) : pathname.substring(1);
	} catch (err) {
		console.error(err);
		return null;
	}
};

const httpRequest = (url, options) => new Promise((resolve, reject) => {
	const req = https.get(url, options, res => {
		let data = '';
		res.on('data', chunk => data += chunk);
		res.on('end', () => {
			try {
				resolve({ data: JSON.parse(data), statusCode: res.statusCode });
			} catch (err) {
				reject(err);
			}
		});
	});

	req.on('error', reject);
	req.on('timeout', () => {
		req.destroy();
		reject(new Error('Request timed out.'));
	});
});

module.exports = async url => {
	if (!url) return { success: false, code: 200, isInvitation: false, message: 'Validation error. Missing invitation.', url: {}, inviter: null, guild: null };
	if (url.length >= 68) return { success: false, code: 200, isInvitation: false, message: 'Validation error. Invitation is too long.', url: {}, inviter: null, guild: null };

	const invitation = extractCode(url);
	if (!invitation) return { success: false, code: 200, isInvitation: false, message: 'Validation error. Unknown invitation.', url: {}, inviter: null, guild: null };

	try {
		const res = await httpRequest(`https://discord.com/api/v10/invites/${invitation}`, { headers });
		if (res.statusCode !== 200) return { success: true, code: res.statusCode, isInvitation: false, message: res.message || 'Discord API error.', url: res.code || {}, inviter: res.data.inviter || {}, guild: res.data.guild || {} };

		return {
			success: true,
			code: 200,
			isInvitation: true,
			message: 'Success',
			url: {
				full: url,
				invitationCode: invitation,
				fetchedCode: res.data.code || {},
			},
			inviter: res.data.inviter || {},
			guild: res.data.guild || {},
		};
	} catch (err) {
		return { success: false, code: err.response?.status || undefined, isInvitation: false, message: err.message, url: {}, inviter: null, guild: null };
	}
};