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HtmlDownloader.cs
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HtmlDownloader.cs
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using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Forms;
using HtmlAgilityPack;
using HtmlDocument = HtmlAgilityPack.HtmlDocument;
namespace TuentiDownloader
{
internal class HtmlDownloader
{
public string ResourcePath { get; set; }
public void Download(HtmlDocument document, string path)
{
Directory.CreateDirectory(ResourcePath);
//Descargar todos los recursos
_downloadImages(document);
_downloadResources(document, "link", "href", true);
_downloadResources(document, "script", "src");
//Añadir cabeceras meta para indificar codificación UTF8
HtmlNode meta = document.CreateElement("meta");
meta.Attributes.Add("charset", "utf-8");
document.DocumentNode.SelectSingleNode("//head").ChildNodes.Add(meta);
/*HtmlNode meta2 = document.CreateElement("meta");
meta2.Attributes.Add("http-equiv", "Content-Type");
meta2.Attributes.Add("content", "Type=text/html; charset=utf-8");
document.DocumentNode.SelectSingleNode("//head").ChildNodes.Add(meta2);*/
File.WriteAllText(path, document.DocumentNode.WriteTo(), new UTF8Encoding(true));
}
private void _downloadResources(HtmlDocument document, string tagName, string hrefAttr, bool rewriteUrls = false)
{
// foreach (HtmlElement link in document.GetElementsByTagName(tagName))
var links = document.DocumentNode.SelectNodes("//" + tagName);
if (links != null)
{
foreach (HtmlNode link in links)
{
try
{
// string url = link.GetAttribute(hrefAttr);
string url = link.Attributes[hrefAttr].Value;
if (string.IsNullOrEmpty(url))
continue;
bool isNew;
string fileName = _downloadFile(url, out isNew);
if (isNew && rewriteUrls)
{
var regex = new Regex("url\\(\"?(.+?)\"?\\)", RegexOptions.IgnoreCase | RegexOptions.Compiled);
string filePath = Path.Combine(ResourcePath, fileName);
string content = File.ReadAllText(filePath);
foreach (Match match in regex.Matches(content))
{
try
{
string resourceUrl = match.Groups[1].Value;
string filename = _downloadFile(resourceUrl, out isNew);
content = content.Replace(resourceUrl, filename);
}
catch
{
}
}
File.WriteAllText(filePath, content);
}
link.Attributes[hrefAttr].Value = "Recursos/" + fileName;
}
catch
{
}
}
}
}
private string _downloadFile(string url, out bool isNew)
{
if (url.StartsWith("//"))
url = "http:" + url;
string fileName = _makeValidFileName(url);
string filePath = Path.Combine(ResourcePath, fileName);
if (!File.Exists(filePath) || new FileInfo(filePath).Length==0)
{
Application.DoEvents();
using (var client = new WebClient())
{
client.DownloadFile(url, filePath);
isNew = true;
}
Application.DoEvents();
}
else
{
isNew = false;
}
return fileName;
}
private void _downloadImages(HtmlDocument document)
{
var images = document.DocumentNode.SelectNodes("//img");
if (images != null)
{
foreach (HtmlNode imageElement in images)
{
try
{
string url = imageElement.Attributes["src"].Value;
if (url.StartsWith("file://"))
continue;
bool isNew;
string fileName = _downloadFile(url, out isNew);
// if (isNew)
string filePath = Path.Combine(ResourcePath, fileName);
//Intentar ajustar la extensión
if (Path.GetExtension(fileName) == "" || Path.GetExtension(fileName).Length > 5)
{
try
{
string extension = ".jpg";
using (Image image = Image.FromFile(filePath))
{
if (ImageFormat.Jpeg.Equals(image.RawFormat))
{
extension = ".jpg";
}
else if (ImageFormat.Png.Equals(image.RawFormat))
{
extension = ".png";
}
else if (ImageFormat.Gif.Equals(image.RawFormat))
{
extension = ".gif";
}
}
fileName += extension;
string newFilePath = Path.Combine(ResourcePath, fileName);
if (File.Exists(newFilePath))
{
File.Delete(filePath);
}
else
{
File.Move(filePath, newFilePath);
}
filePath = newFilePath;
}
catch
{
}
}
imageElement.Attributes["src"].Value = "Recursos/" + fileName;
}
catch
{
}
}
}
}
private string _makeValidFileName(string name)
{
string regexSearch = new string(Path.GetInvalidFileNameChars()) + new string(Path.GetInvalidPathChars());
var r = new Regex(string.Format("[{0}]", Regex.Escape(regexSearch)));
return r.Replace(name, "");
}
}
}