myapp-common.js

if(Meteor.isServer) {
	cheerio = Npm.require("cheerio");
}

validEmail = function (email) {
	var re = /^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
	return re.test(email);
};

purify = function(text, allowedTags, allowedAttributes) {

	console.log(text);

	if(Meteor.isServer) {
		text = replaceTextSections(text);
	}

	if(!allowedTags) allowedTags = ['b', 'i', 'strong', 'em', 'ol', 'ul', 'li', 'p', 'span', 'a', 'img', 'br'];

	if(!allowedAttributes) allowedAttributes = ['href', 'src'];

	var disallowedTags = ['b', 'i', 'strong', 'em', 'blockquote', 'ol', 'ul', 'li', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'h7', 'p', 'span', 'pre', 'a', 'u', 'img', 'br', 'table'];

	// Check the difference between the default enabled tags and the allowed tags
	var disallowedTags = _.difference(disallowedTags, allowedTags);

	// Don't allow extra attributes to an element
	UniHTML.setNewAllowedAttributes(allowedAttributes, 'all_elements');
	// Purify the answer text and stripe disallowed tags
	var purified = UniHTML.purify(text, {
		withoutTags: disallowedTags
	});

	return purified;
};

var replaceTextSections = function(text) {

	if(Meteor.isServer) {
		 $ = cheerio.load(text);
	}

	$('br').after('<br>');

	console.log($);

	return $.html();
};

package.js

Package.describe({
	name: 'myapp-common',
	version: '0.0.1',
	// Brief, one-line summary of the package.
	summary: '',
	// URL to the Git repository containing the source code for this package.
	git: '',
	// By default, Meteor will default to using README.md for documentation.
	// To avoid submitting documentation, set this field to null.
	documentation: 'README.md'
});

Npm.depends({cheerio: '0.19.0'});

Package.onUse(function(api) {
	api.use([
		'tap:i18n',
	 	'myapp-i18n',
		'vazco:universe-html-purifier',
		'wtfzn:dompurify'
	]);

	api.use(['jquery', 'session'], 'client');

	api.addFiles([
		'myapp-common.js'
	]);

	api.export([
		'purify',
		'trans',
		'validEmail',
		'cheerio'
	]);

});

Package.onTest(function(api) {
	api.use('tinytest');
	api.use('myapp-common');
	api.addFiles('myapp-common-tests.js');
});