xiao/commands/edit-avatar/fire.js

const Command = require('../../structures/Command');
const { createCanvas, loadImage } = require('canvas');
const GIFEncoder = require('gifencoder');
const request = require('node-superfetch');
const path = require('path');
const { streamToArray } = require('../../util/Util');
const { drawImageWithTint } = require('../../util/Canvas');
const frameCount = 31;

module.exports = class FireCommand extends Command {
	constructor(client) {
		super(client, {
			name: 'fire',
			aliases: ['hell', 'burn', 'flames'],
			group: 'edit-avatar',
			memberName: 'fire',
			description: 'Burns a user\'s avatar.',
			throttling: {
				usages: 2,
				duration: 30
			},
			clientPermissions: ['ATTACH_FILES'],
			credit: [
				{
					name: 'LowGif',
					url: 'http://www.lowgif.com/',
					reason: 'Images',
					reasonURL: 'http://www.lowgif.com/43360ebce9150f23.html'
				}
			],
			args: [
				{
					key: 'user',
					prompt: 'Which user would you like to edit the avatar of?',
					type: 'user',
					default: msg => msg.author
				}
			]
		});
	}

	async run(msg, { user }) {
		const avatarURL = user.displayAvatarURL({ format: 'png', size: 512 });
		try {
			const { body } = await request.get(avatarURL);
			const avatar = await loadImage(body);
			const encoder = new GIFEncoder(avatar.width, avatar.height);
			const canvas = createCanvas(avatar.width, avatar.height);
			const ctx = canvas.getContext('2d');
			const stream = encoder.createReadStream();
			encoder.start();
			encoder.setRepeat(0);
			encoder.setDelay(100);
			encoder.setQuality(200);
			for (let i = 0; i < frameCount; i += 2) {
				const frameID = `frame-${i.toString().padStart(2, '0')}.png`;
				const frame = await loadImage(path.join(__dirname, '..', '..', 'assets', 'images', 'fire', frameID));
				const ratio = frame.width / frame.height;
				const height = Math.round(avatar.width / ratio);
				drawImageWithTint(ctx, avatar, '#fc671e', 0, 0, avatar.width, avatar.height);
				ctx.drawImage(frame, 0, avatar.height - height, avatar.width, height);
				encoder.addFrame(ctx);
			}
			encoder.finish();
			const buffer = await streamToArray(stream);
			return msg.say({ files: [{ attachment: Buffer.concat(buffer), name: 'fire.gif' }] });
		} catch (err) {
			return msg.reply(`Oh no, an error occurred: \`${err.message}\`. Try again later!`);
		}
	}
};