@kldit/cms/lib/validators/image-resolution.js

A CMS Framework for @kldit/mvc

const gm = require('gm');
const { promisify } = require('util');
const Promise = require('bluebird');
Promise.promisifyAll(gm.prototype);

module.exports = async function (cms, fieldName, value, rule, db)
{
	const field = cms.request.column(fieldName).field;
	let url = field.url(cms, value);
	let stat = gm(url);

	let { width, height } = await stat.sizeAsync();
	let ar = undefined;
	if(rule['aspect-ratio'])
	{
		ar = rule['aspect-ratio'].split(":");
		ar = Math.floor(ar[0] * 1000 / ar[1]);
	}

	if(rule['min-width'] !== undefined && width < rule['min-width'])
	{
		return false;
	}
	else if(rule['max-width'] !== undefined && width > rule['max-width'])
	{
		return false;
	}
	else if(rule['width'] !== undefined && width != rule['width'])
	{
		return false;
	}
	else if(rule['min-height'] !== undefined && height < rule['min-height'])
	{
		return false;
	}
	else if(rule['max-height'] !== undefined && height > rule['max-height'])
	{
		return false;
	}
	else if(rule['height'] !== undefined && height != rule['height'])
	{
		return false;
	}
	else if(rule['aspect-ratio'] !== undefined && Math.floor(width * 1000 / height) != ar)
	{
		return false;
	}
	else
	{
		return true;
	}
};