xiao/commands/edit-image/convert-image.js

const Command = require('../../structures/Command');
const { createCanvas, loadImage } = require('canvas');
const request = require('node-superfetch');
const { list } = require('../../util/Util');
const formats = {
	jpg: 'image/jpeg',
	jpeg: 'image/jpeg',
	png: 'image/png'
};

module.exports = class ConvertImageCommand extends Command {
	constructor(client) {
		super(client, {
			name: 'convert-image',
			aliases: ['convert-img', 'image-convert', 'img-convert'],
			group: 'edit-image',
			memberName: 'convert-image',
			description: 'Converts an image or user\'s avatar from one format to another.',
			details: `**Formats:** ${Object.keys(formats).join(', ')}`,
			throttling: {
				usages: 1,
				duration: 10
			},
			clientPermissions: ['ATTACH_FILES'],
			args: [
				{
					key: 'format',
					prompt: `What format do you want to convert the image to? Either ${list(Object.keys(formats), 'or')}.`,
					type: 'string',
					oneOf: Object.keys(formats),
					parse: format => format.toLowerCase()
				},
				{
					key: 'image',
					prompt: 'Which image would you like to edit?',
					type: 'image',
					default: msg => msg.author.displayAvatarURL({ format: 'png', size: 512 })
				}
			]
		});
	}

	async run(msg, { format, image }) {
		try {
			const { body } = await request.get(image);
			const data = await loadImage(body);
			const canvas = createCanvas(data.width, data.height);
			const ctx = canvas.getContext('2d');
			ctx.drawImage(data, 0, 0);
			return msg.say({ files: [{ attachment: canvas.toBuffer(formats[format]), name: `convert-image.${format}` }] });
		} catch (err) {
			return msg.reply(`Oh no, an error occurred: \`${err.message}\`. Try again later!`);
		}
	}
};