RuneScape.cs

using System;
using System.Text;
using System.Net;
using System.IO;
using System.Net.Cache;
using System.Security.Authentication;

public sealed class RuneScape
{
    /// <summary>
    /// Username or Email address
    /// </summary>
    public String UserName { get; set; }

    /// <summary>
    /// Password
    /// </summary>
    public String Password { get; set; }

    /// <summary>
    /// Nickname
    /// </summary>
    public String NickName { get; protected set; }

    /// <summary>
    /// Member status
    /// </summary>
    public Boolean IsMember { get; protected set; }

    /// <summary>
    /// Account Id
    /// </summary>
    public Int32 AccountId { get; protected set; }

    /// <summary>
    /// Is authenticated
    /// </summary>
    public Boolean IsAuthenticated { get; protected set; }

    /// <summary>
    /// Session data
    /// </summary>
    public CookieContainer Cookies { get; protected set; }

    /// <summary>
    /// Proxy
    /// </summary>
    public WebProxy Proxy { get; set; }

    /// <summary>
    /// Base uri
    /// </summary>
    private const String Base = "https://secure.runescape.com";

    /// <summary>
    /// Constructor
    /// </summary>
    public RuneScape()
    {
        SslProtocols tlsToken = (SslProtocols)0xC00;
        ServicePointManager.SecurityProtocol = (SecurityProtocolType)tlsToken;
        ServicePointManager.MaxServicePoints = ushort.MaxValue;
        ServicePointManager.Expect100Continue = false;
        ServicePointManager.MaxServicePointIdleTime = 0;

        Refresh();
    }

    /// <summary>
    /// Refresh session
    /// </summary>
    /// <returns></returns>
    public Boolean Refresh()
    {
        IsAuthenticated = false;
        Cookies = new CookieContainer();
        return true;
    }

    /// <summary>
    /// Authenticate with RuneScape
    /// </summary>
    public Boolean Authenticate()
    {
        if (String.IsNullOrEmpty(UserName) || String.IsNullOrEmpty(Password))
            return false;

        if (CanAuthenticate())
        {
            Encoding encoding = Encoding.GetEncoding("iso-8859-15");
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Base + "/m=weblogin/login.ws");
            request.Method = "POST";

            request.CookieContainer = Cookies;
            request.Proxy = Proxy;
            request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
            request.UseDefaultCredentials = false;

            request.Headers.Set("Accept-Language", "en-US,en;q=0.5");
            request.Headers.Set("Accept-Encoding", "gzip, deflate, br");
            request.Headers.Set("Upgrade-Insecure-Requests", "1");
            request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0";
            request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
            request.AllowAutoRedirect = true;
            request.CachePolicy = new RequestCachePolicy(level: RequestCacheLevel.BypassCache);
            request.KeepAlive = true;

            String postData = string.Format("username={0}&password={1}&mod=www&ssl=1&expired=0&dest={2}", Uri.EscapeDataString(UserName), Uri.EscapeDataString(Password), Uri.EscapeDataString("account_settings.ws"));
            Byte[] httpPostData = Encoding.UTF8.GetBytes(postData);

            request.Referer = Path.Combine(Base, "/m=weblogin/loginform.ws?mod=www&ssl=1&expired=0");
            request.ContentType = "application/www-form-urlencoded";
            request.ContentLength = httpPostData.Length;

            using (Stream requestStream = request.GetRequestStream())
            {
                requestStream.Write(httpPostData, 0, httpPostData.Length);
            }

            HttpWebResponse response = default(HttpWebResponse);
            try
            {
                response = (HttpWebResponse)request.GetResponse();
            }
            catch (WebException exception)
            {
                response = (HttpWebResponse)exception.Response;
            }

            if (response != null)
            {
                if (((Int32)response.StatusCode / 100) == 2)
                {
                    Boolean result = response.ResponseUri.ToString().IndexOf("account_settings.ws") != -1;
                    if (result)
                    {
                        using (Stream responseStream = response.GetResponseStream())
                        {
                            using (StreamReader reader = new StreamReader(responseStream, encoding))
                            {
                                String htmlSource = reader.ReadToEnd();

                                NickName = GetNickname(htmlSource);
                                if (NickName == null)
                                    NickName = UserName;

                                IsMember = GetMemberStatus(htmlSource);
                                AccountId = GetAccountId(htmlSource);
                            }
                        }

                        IsAuthenticated = result;
                        return IsAuthenticated;
                    }
                }

                response.Close();
            }
            else {
                throw new WebException("Could not connect to the RuneScape server");
            }
        }

        return false;
    }

    /// <summary>
    /// Check if can authenticate
    /// </summary>
    public Boolean CanAuthenticate()
    {
        Encoding encoding = Encoding.GetEncoding("iso-8859-15");
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Base + "/m=weblogin/loginform.ws?mod=www&ssl=1&expired=0");
        request.Method = "GET";

        request.CookieContainer = Cookies;
        request.Proxy = Proxy;
        request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
        request.UseDefaultCredentials = false;

        request.Headers.Set("Accept-Language", "en-US,en;q=0.5");
        request.Headers.Set("Accept-Encoding", "gzip, deflate, br");
        request.Headers.Set("Upgrade-Insecure-Requests", "1");
        request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0";
        request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
        request.AllowAutoRedirect = true;
        request.CachePolicy = new RequestCachePolicy(level: RequestCacheLevel.BypassCache);
        request.KeepAlive = true;

        request.Referer = Base;

        HttpWebResponse response = default(HttpWebResponse);
        try
        {
            response = (HttpWebResponse)request.GetResponse();
        }
        catch (WebException exception)
        {
            response = (HttpWebResponse)exception.Response;
        }

        if (response != null)
        {
            if (((Int32)response.StatusCode / 100) == 2)
            {
                using (Stream responseStream = response.GetResponseStream())
                {
                    using (StreamReader reader = new StreamReader(responseStream, encoding))
                    {
                        String responseHtml = reader.ReadToEnd();
                        return (responseHtml.IndexOf("captcha") == -1);
                    }
                }
            }

            response.Close();
        }
        else
        {
            throw new WebException("Could not connect to the RuneScape server");
        }

        return false;
    }

    /// <summary>
    /// Extract nickname from HTML
    /// </summary>
    private String GetNickname(String htmlSource)
    {
        Int32 startIndex = htmlSource.IndexOf("name: ");
        Int32 endIndex = -1;

        if (startIndex == -1)
            return null;

        startIndex = htmlSource.IndexOf("'", startIndex);

        if (startIndex == 1)
            return null;

        endIndex = htmlSource.IndexOf("'", startIndex + 1);

        if (endIndex == -1 || startIndex == -1)
            return null;

        return htmlSource.Substring(startIndex + 1, (endIndex - startIndex - 1));
    }

    /// <summary>
    /// Extract membership status from HTML
    /// </summary>
    private Boolean GetMemberStatus(String htmlSource)
    {
        Int32 startIndex = htmlSource.IndexOf("member:");
        Int32 endIndex = -1;

        if (startIndex == -1)
            return false;

        startIndex = htmlSource.IndexOf(" ", startIndex);

        if (startIndex == 1)
            return false;

        endIndex = htmlSource.IndexOf(",", startIndex + 1);

        if (endIndex == -1 || startIndex == -1)
            return false;

        return htmlSource.Substring(startIndex + 1, (endIndex - startIndex - 1)) == "true";
    }

    /// <summary>
    /// Extract account id from HTML
    /// </summary>
    private Int32 GetAccountId(String htmlSource)
    {
        Int32 startIndex = htmlSource.IndexOf("id:");
        Int32 endIndex = -1;

        if (startIndex == -1)
            return -1;

        startIndex = htmlSource.IndexOf(" ", startIndex);

        if (startIndex == 1)
            return -1;

        endIndex = htmlSource.IndexOf(",", startIndex + 1);

        if (endIndex == -1 || startIndex == -1)
            return -1;

        return Int32.Parse(htmlSource.Substring(startIndex + 1, (endIndex - startIndex - 1)));
    }
}