Innovative Software Design

/*
	Resource Qualifier - By Forrest Croce, December 2008.
	This code is released as open source;  please attribute the author and source.
*/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using HtmlAgilityPack;

namespace FullyQualifyNetworkResourceAddresses {
	public static class WebUtility {

		public static string GetPageCode(string uri) {
			if (!Uri.IsWellFormedUriString(uri, UriKind.Absolute))
				return null;

			return GetPageCode(new Uri(uri));
		}

		public static string GetPageCode(Uri uri) {
			try {
				WebClient web = new WebClient();
				return web.DownloadString(uri);
			} catch (Exception ex) {
				return null;
			}
		}

		public static HtmlDocument GetPage(Uri uri) {
			string html = GetPageCode(uri);

			if(string.IsNullOrEmpty(html))
				return null;

			HtmlDocument doc = new HtmlDocument();
			doc.LoadHtml(html);
			return doc;
		}

		public static Uri Qualify(string baseUri, string relativePath) {
			if (Uri.IsWellFormedUriString(relativePath, UriKind.Absolute))
				return new Uri(relativePath);

			if (!Uri.IsWellFormedUriString(baseUri, UriKind.Absolute))
				return null;

			Uri b = new Uri(baseUri, UriKind.RelativeOrAbsolute);

			return new Uri(b, relativePath);
		}


		internal static HtmlDocument GetPage(string html) {
			HtmlDocument doc = new HtmlDocument();
			doc.LoadHtml(html);
			return doc;
		}
	}
}