Offline Article Editor For CodeProject

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Text.RegularExpressions;
using System.Threading;
using System.IO;
using System.Net;

namespace CodeProjectArticleEditor
{
    class CPExtractor
    {
        // --------------------------------------------
        //  CodeProjectArticleEditor > CPExtractor.cs
        // --------------------------------------------
        //  CodeProject Article Editor
        //  Huseyin Atasoy
        //  atasoyweb.net [at] gmail.com
        //  www.atasoyweb.net
        //  September 2012
        // --------------------------------------------

        public Action After_LoadLoginPage = null;
        public Action After_Login = null;
        public Action After_LoadArticleList = null;
        public Action After_LoadAnArticle = null;
        public Action After_LoadLogoutPage = null;

        private bool _isLoggedIn = false;
        public bool isLoggedIn
        {
            get { return _isLoggedIn; }
        }

        private string _loginInfo = null;
        public string loginInfo
        {
            get { return _loginInfo; }
        }

        private string _memberID;
        public string memberID
        {
            get { return _memberID; }
        }

        private string _memberFullName;
        public string memberFullName
        {
            get { return _memberFullName; }
        }

        private string _memberName;
        public string memberName
        {
            get { return _memberName; }
        }

        private string _avgArRating;
        public string avgArRating
        {
            get { return _avgArRating; }
        }

        private int _articleCount;
        public int articleCount
        {
            get { return _articleCount; }
        }

        private string _lastLoadedArticleContent;
        public string lastLoadedArticleContent
        {
            get { return _lastLoadedArticleContent; }
        }


        public enum NavigatedFor
        {
            Nothing,
            LoadLoginPage,
            Login,
            LoadArticleList,
            LoadAnArticle,
            LoadLogoutPage
        }
        private NavigatedFor _navigatedFor = NavigatedFor.Nothing;
        public NavigatedFor navigatedFor
        {
            get { return _navigatedFor; }
        }

        public struct Article
        {
            public string id;
            public string name;
            public string info;
            public Article(string id, string name, string info)
            {
                this.id = id;
                this.name = name;
                this.info = info;
            }
        }

        private List<Article> _articles;
        public List<Article> articles
        {
            get { return _articles; }
        }

        private WebBrowser webBrowser;

        private frmMain actionInvoker;

        public CPExtractor(frmMain actionInvoker)
        {
            this.actionInvoker = actionInvoker;
            ClickSoundDisabler.disableClickSound();
            webBrowser = new WebBrowser();
            webBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser_DocumentCompleted);
        }

        private string email, password;
        public void login(string email, string password)
        {
            this.email = email;
            this.password = password;
            _navigatedFor = NavigatedFor.LoadLoginPage;
            webBrowser.Navigate("https://www.codeproject.com/script/Membership/LogOn.aspx?rp=/&yenilemesiicin=" + Guid.NewGuid().ToString());
        }

        public void logout()
        {
            _navigatedFor = NavigatedFor.LoadLogoutPage;
            webBrowser.Navigate("http://www.codeproject.com/script/Membership/LogOff.aspx?rp=%2f&yenilemesiicin=" + Guid.NewGuid().ToString());
        }

        private string lastLoadedArticleId;
        private string articlePathToSaveContents;
        public void loadArticle(int index, string articlePath)
        {
            _navigatedFor = NavigatedFor.LoadAnArticle;
            lastLoadedArticleId = _articles[index].id;
            this.articlePathToSaveContents = articlePath;
            webBrowser.Navigate("http://www.codeproject.com/script/Articles/ViewHtml.aspx?aid=" + lastLoadedArticleId + "&yenilemesiicin=" + Guid.NewGuid().ToString());
        }

        private void webBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            switch (_navigatedFor)
            {
                case NavigatedFor.Nothing:
                    return;

                case NavigatedFor.LoadLogoutPage:
                    _isLoggedIn = false;
                    if (After_LoadLogoutPage != null)
                        actionInvoker.Invoke(After_LoadLogoutPage);
                    break;

                case NavigatedFor.LoadLoginPage:
                    if (extractMemberId())
                    {
                        MessageBox.Show(null, "You are already logged in. Please don't forget to logout before you exit the program...", "Already Logged In", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                        _navigatedFor = NavigatedFor.Login;
                        webBrowser_DocumentCompleted(null, null);
                    }
                    else
                    {
                        try
                        {
                            _navigatedFor = NavigatedFor.Login;
                            webBrowser.Document.GetElementById(getElementId("_MC_MemberLogOn_CurrentEmail")).SetAttribute("value", email);
                            webBrowser.Document.GetElementById(getElementId("_MC_MemberLogOn_CurrentPassword")).SetAttribute("value", password);
                            webBrowser.Document.GetElementById(getElementId("_MC_MemberLogOn_SignInButton")).InvokeMember("click");
                        }
                        catch
                        {
                            _navigatedFor = NavigatedFor.Nothing;
                        }
                    }

                    if (After_LoadLoginPage != null)
                        actionInvoker.Invoke(After_LoadLoginPage);
                    break;

                case NavigatedFor.Login:
                    string errorElementId = getElementId("LogonError");
                    if (errorElementId.Length > 1)
                    {
                        _isLoggedIn = false;
                        _navigatedFor = NavigatedFor.Nothing;
                        HtmlElement errorElement = webBrowser.Document.GetElementById(errorElementId);
                        MessageBox.Show(null, errorElement.InnerText, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                    else
                    {
                        if (extractMemberId())
                        {
                            _isLoggedIn = true;
                            _navigatedFor = NavigatedFor.LoadArticleList;
                            webBrowser.Navigate("http://www.codeproject.com/script/Articles/MemberArticles.aspx?amid=" + _memberID + "&yenilemesiicin=" + Guid.NewGuid().ToString());
                        }
                        else
                        {
                            _isLoggedIn = false;
                            _navigatedFor = NavigatedFor.Nothing;
                        }
                    }
                    if (After_Login != null)
                        actionInvoker.Invoke(After_Login);
                    break;

                case NavigatedFor.LoadArticleList:
                    _avgArRating = webBrowser.Document.GetElementById(getElementId("ArticleRatingDiv")).InnerText.Trim();

                    bool startedFrom1 = false;
                    _articleCount = 0;
                    _articles = new List<Article>();

                    string prefixForArticles = getElementId("_MC_AR_ctl");
                    HtmlElement link = webBrowser.Document.GetElementById(prefixForArticles + _articleCount.ToString("00") + "_CAR_Title");
                    if (link == null) // Try to start from 1
                    {
                        startedFrom1 = true;
                        _articleCount = 1;
                        link = webBrowser.Document.GetElementById(prefixForArticles + _articleCount.ToString("00") + "_CAR_Title");
                    }
                    while (link != null)
                    {
                        string articleName = link.InnerText;

                        string articleInfo = "";
                        try
                        {
                            articleInfo = webBrowser.Document.GetElementById(prefixForArticles + _articleCount.ToString("00") + "_CAR_SbD").InnerText.Trim();
                            articleInfo = Regex.Replace(articleInfo, "[ ]{2,}", " | ");
                        }
                        catch { }

                        try
                        {
                            articleInfo += " | " + webBrowser.Document.GetElementById(prefixForArticles + _articleCount.ToString("00") + "_CAR_BookmarkCountSpan").InnerText.Trim();
                        }
                        catch { }

                        try
                        {
                            articleInfo += " | " + webBrowser.Document.GetElementById(prefixForArticles + _articleCount.ToString("00") + "_CAR_DownloadCountSpan").InnerText.Trim();
                        }
                        catch { }

                        string linkToTheArticle = link.GetAttribute("href");
                        string articleID = Regex.Match(linkToTheArticle, "/([0-9]{1,12})/").Groups[1].Value;

                        _articles.Add(new Article(articleID, articleName, articleInfo));

                        _articleCount++;
                        link = webBrowser.Document.GetElementById(prefixForArticles + _articleCount.ToString("00") + "_CAR_Title");
                    }

                    if (startedFrom1)
                        _articleCount--;

                    _navigatedFor = NavigatedFor.Nothing;
                    if (After_LoadArticleList != null)
                        actionInvoker.Invoke(After_LoadArticleList);
                    break;

                case NavigatedFor.LoadAnArticle:
                    _navigatedFor = NavigatedFor.Nothing;
                    if (webBrowser.Document.GetElementById("ArticleContent") != null)
                        downloadRelatedImages();
                    else
                    {
                        _lastLoadedArticleContent = null;

                        if (After_LoadAnArticle != null)
                            actionInvoker.Invoke(After_LoadAnArticle);
                    }
                    break;
            }
        }

        // Added on 05/10/2012 to be able to find element IDs using a suffix...
        private string getElementId(string suffix)
        {
            Match m = Regex.Match(webBrowser.Document.Body.InnerHtml, "(ctl[0-9]{1,3}[A-Za-z0-9_]{1,64}" + suffix + ")", RegexOptions.IgnoreCase);
            if (m.Success)
                return m.Groups[1].Value;
            else
                return "";
        }

        private void downloadRelatedImages()
        {
            string[] images = new string[webBrowser.Document.Images.Count];
            for (int i = 0; i < images.Length; i++)
                images[i] = webBrowser.Document.Images[i].GetAttribute("src");

            new Thread((object o) =>
            {
                try
                {
                    try{ Directory.CreateDirectory(articlePathToSaveContents + "\\" + lastLoadedArticleId + "\\"); }catch { }
                    WebClient webClient = new WebClient();
                    webClient.Proxy = null; // To prevent it from trying to determine proxy settings of IE
                    for (int i = 0; i < images.Length; i++)
                        try
                        {
                            string src = images[i];
                            Uri uri = new Uri(src);
                            string imageFileName = Path.GetFileName(uri.LocalPath);
                            webClient.DownloadFile(src, articlePathToSaveContents + lastLoadedArticleId + "\\" + imageFileName);
                            images[i] = lastLoadedArticleId + "/" + imageFileName; // To make src attribute relative
                        }
                        catch { }
                }
                catch { }

                webBrowser.Invoke((Action)(() =>
                {
                    for (int i = 0; i < images.Length; i++) // Change src attributes
                        webBrowser.Document.Images[i].SetAttribute("src", images[i]);

                    _lastLoadedArticleContent = webBrowser.Document.GetElementById("ArticleContent").InnerHtml; 
                }));

                if (After_LoadAnArticle != null)
                    actionInvoker.Invoke(After_LoadAnArticle);
            }).Start();
        }

        private bool extractMemberId()
        {
            try
            {
                string href = webBrowser.Document.GetElementById(getElementId("MyProfile")).GetAttribute("href");
                int start = href.LastIndexOf("=") + 1;
                _memberID = href.Substring(start, href.Length - start);
                _memberFullName = webBrowser.Document.GetElementById(getElementId("MyProfile")).InnerText;
                if (_memberID.Length < 1 || _memberFullName.Length < 1)
                    return false;
                if (_memberFullName.Contains(" "))
                    _memberName = _memberFullName.Substring(0, _memberFullName.IndexOf(" "));
                else
                    _memberName = _memberFullName;
            }
            catch
            {
                return false;
            }
            return true;
        }
    }
}