an idea of expansion of WebKit.NET's WebKitBrowser control

WebKitBrowserEx.cs

// Copyright (c) 2011, Hiroshi Tsujimura
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 
//  * Redistributions of source code must retain the above copyright notice,
//    this list of conditions and the following disclaimer.
//  * Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//  * Neither the name of watcher.moe-nifty.com. nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE. 

using System;
using System.Windows.Forms;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Text;
using System.Net;
using System.IO;
using WebKit;

namespace webkitTest4
{
    public class WebKitBrowserEx : WebKitBrowser
    {
        /// <summary>
        /// 「URL欄」表示用の URL の履歴
        /// </summary>
        public Collection<string> history;

        /// <summary>
        /// 「履歴メニュー」表示用の履歴情報(URL と title)
        /// </summary>
        public List<ToolStripMenuItem> histories;

        public WebKitBrowserEx()
        {
            ShowJavaScriptAlertPanel += (s, e) =>
                MessageBox.Show(e.Message, "[JavaScript Alert]");

            ShowJavaScriptConfirmPanel += (s, e) =>
            {
                e.ReturnValue =
                    MessageBox.Show(
                        e.Message,
                        "[JavaScript Confirm]",
                        MessageBoxButtons.YesNo) == DialogResult.Yes;
            };

            ShowJavaScriptPromptPanel += (s, e) =>
            {
                var dlg = new JavaScriptPrompt(e.Message, e.DefaultValue);
                if (dlg.ShowDialog() == DialogResult.OK)
                    e.ReturnValue = dlg.PromptText;
            };


            // history (初期値は「スピードダイアル」の代用 => 「優先URL」)
            history = new Collection<string>();
            history.Clear();

            history.Add("http://www.tumblr.com/dashboard");
            history.Add("http://b.hatena.ne.jp/");
            history.Add("http://twitter.com/");
            history.Add("http://www.google.co.jp/");
            history.Add("http://www.google.com/notebook/?hl=ja");
            history.Add("http://www.asahi.com/");

            histories = new List<ToolStripMenuItem>();
        }

        public new void Navigate(string url)
        {
            if (url.StartsWith("javascript:"))
            {
#if false
                JSContext ctx = (JSContext)GetGlobalScriptContext();
                JSValue val = ctx.EvaluateScript(url);
                if (val == null)
                    StringByEvaluatingJavaScriptFromString(url);
#else
                StringByEvaluatingJavaScriptFromString(url);
#endif
            }
            else
            {
                // なぜか https:// ではじまる Web ページに関しては base.Navigate(url) が
                // うまく機能しないので、WebRequest を使って何とかする
                // (あくまでも base.Navigate(url) がちゃんと機能するようになるまでの暫定対処)
                if (url.StartsWith("https://"))
                {
                    CookieContainer cc = new CookieContainer();
                    string text = GetWebPage(url, cc);
                    if (text != null && text.Length > 0)
                    {
                        DocumentText = text; // なぜか text の値が反映されない場合がある (例: https://github.com/)
                        if (DocumentText == string.Empty)
                            DocumentText =
                                @"<html>
                                  <head><title>https test</title></head>
                                  <body><p>https test page</p></body>
                                  </html>";
                    }
                }
                else
                    base.Navigate(url);
            }
        }

        public string GetWebPage(string url, CookieContainer cc)
        {
            WebProxy proxy = null;
            WebRequest.DefaultWebProxy = null;
            bool useProxy = Properties.Settings.Default.useProxy;
            if (useProxy)
            {
                string proxyServerURL = Properties.Settings.Default.proxyServer;
                int proxyServerPortNumber = Properties.Settings.Default.proxyPort;
                string proxyUserName = Properties.Settings.Default.proxyUsername;
                string proxyPassword = Properties.Settings.Default.proxyPassword;

                if ((proxyServerPortNumber > UInt16.MinValue) &&
                    (proxyServerPortNumber <= UInt16.MaxValue))
                {
                    proxy = new WebProxy(
                        proxyServerURL + ":" + proxyServerPortNumber.ToString());
                    if ((proxyUserName.Length > 0) && (proxyPassword.Length > 0))
                        proxy.Credentials =
                            new NetworkCredential(proxyUserName, proxyPassword);
                    WebRequest.DefaultWebProxy = proxy;
                }
            }

            string result = "";
            Encoding encode = Encoding.GetEncoding("utf-8");

            // 指定Webページを取得
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.UserAgent = UserAgent;

            if (cc != null)
                request.CookieContainer = cc;

            // はてブ対策 (http://d.hatena.ne.jp/tomity/20080213/1202890384)
            ServicePoint currentServicePoint = request.ServicePoint;
            if (currentServicePoint != null)
                currentServicePoint.Expect100Continue = false;
            request.AllowAutoRedirect = true;

            HttpWebResponse response = SendRequest(request);
            if (response == null)
                return result;

            Stream receiveStream = response.GetResponseStream();
            StreamReader readStream = new StreamReader(receiveStream, encode);

            while (!readStream.EndOfStream)
            {
                result += readStream.ReadLine();
            }

            readStream.Close();
            response.Close();

            return result;
        }

        public static HttpWebResponse SendRequest(HttpWebRequest request)
        {
            HttpWebResponse response = null;

            try
            {
                response = (HttpWebResponse)request.GetResponse();
            }
            catch (Exception ee)
            {
                string url = request.Address.ToString();

                if (ee.GetType() == typeof(WebException))
                {
                    WebException we = (WebException)ee;

                    string statusString = we.Status.ToString();
                    string messegeString = we.ToString();
                    int pos = messegeString.IndexOf("\r\n");
                    if (pos > 0)
                        messegeString = messegeString.Substring(0, pos - 1);
                    if (statusString.CompareTo(messegeString) != 0)
                    {
                        statusString += " :: " + messegeString;
                    }
                    if (we.Status == WebExceptionStatus.ProtocolError && we.Response != null)
                        MessageBox.Show(
                            url + ": Cannot access this web page" + "\r\n" +
                            "  Details: " +
                            ((HttpWebResponse)we.Response).StatusCode + "\r\n" +
                            "[" + ((HttpWebResponse)we.Response).StatusDescription + "]",
                            "Server Error");
                    else
                        MessageBox.Show(
                            url + ": Cannot access this web page" + "(" + statusString + ")",
                            "Server Error");
                }
                else
                    MessageBox.Show(
                            url + ": Some error occurred" + " \r\n" +
                            "(" + ee.Message + ")",
                            "Error");

                response = null;
            }

            return response;
        }
    }
}