scrape-meta/dist/rules/url.js

A library to easily scrape metadata from an article on the web using Open Graph metadata, regular HTML metadata, and series of fallbacks.

'use strict';

var isUrl = require('is-url'

/**
 * Wrap a rule with validation and formatting logic.
 *
 * @param {Function} rule
 * @return {Function} wrapped
 */

);function wrap(rule) {
  return function ($) {
    var value = rule($);
    if (typeof value != 'string') return;

    // make sure it's a url
    value = value.trim();
    if (!isUrl(value)) return;

    return value;
  };
}

/**
 * Rules.
 */

module.exports = [wrap(function ($) {
  return $('meta[property="og:url"]').attr('content');
}), wrap(function ($) {
  return $('meta[name="twitter:url"]').attr('content');
}), wrap(function ($) {
  return $('link[rel="canonical"]').attr('href');
}), wrap(function ($, url) {
  return url;
})];