C# và 2captcha - Tích hợp giúp giải mã recaptcha

C#

28

bypass

5

Alex viết ngày 09/01/2020

Mã C# - trình bao bọc API 2captcha.

Để hiểu rõ hơn về cách sử dụng dịch vụ 2captcha, bạn có thể đọc bài “Python - cầu nối giúp giải mã reCaptcha v2.0 bằng dịch vụ 2captcha”.

using System.IO;    
using System;
using System.Net;
using System.Text;

class Recaptcha2captcha
{    
    private static string captcha_service_key;
    private string site_key;
    private string page_url;

    public void setServiceKey(string service_key)
    {        
        Recaptcha2captcha.captcha_service_key = service_key;
    }
    public void setSiteKey(string site_key)
    {
        this.site_key = site_key;
    }
    public void setPageUrl(string page_url)
    {
        this.page_url = page_url;
    }

    public string SendRequest() // HTTP POST
    {
        try
        {
            System.Net.ServicePointManager.Expect100Continue = false;
            var request = (HttpWebRequest)WebRequest.Create("http://2captcha.com/in.php");

            var postData = "key="+ Recaptcha2captcha.captcha_service_key +"&method=userrecaptcha&googlekey=" + this.site_key + "&page_url=" + this.page_url;
            var data = Encoding.ASCII.GetBytes(postData);

            request.Method = "POST";

            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = data.Length;

            using (var stream = request.GetRequestStream())
            {
                stream.Write(data, 0, data.Length);
            }

            var response = (HttpWebResponse)request.GetResponse();

            var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
            response.Close();
            if (responseString.Contains("OK|"))
            {
                return responseString;
            }
            else
            {
                return "2captcha service return error. Error code:" + responseString;
            }
        }
        catch (Exception e)
        {
            return e.Message;
        }

    }
    public string SubmitForm(string RecaptchaResponseToken)  // HTTP POST
    {
        // var page_url = "http://testing-ground.scraping.pro/recaptcha";
        try
        {
            System.Net.ServicePointManager.Expect100Continue = false;
            var request = (HttpWebRequest)WebRequest.Create(this.page_url);

            var postData = "submit=submin&g-recaptcha-response="  + RecaptchaResponseToken;
            var data = Encoding.ASCII.GetBytes(postData);

            request.Method = "POST";

            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = data.Length;

            using (var stream = request.GetRequestStream())
            {
                stream.Write(data, 0, data.Length);
            }

            var response = (HttpWebResponse)request.GetResponse();

            var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
            response.Close();
            return responseString;
        }
        catch (Exception e)
        {
            return e.Message;
        }

    }

    // the request to retrieve g-recaptcha-response token from 2captcha service
    public string getToken(string captcha_id)  // HTTP GET
    {
        WebClient webClient = new WebClient();
        webClient.QueryString.Add("key", Recaptcha2captcha.captcha_service_key);
        webClient.QueryString.Add("action", "get");
        webClient.QueryString.Add("id", captcha_id);

        return webClient.DownloadString("http://2captcha.com/res.php");
    }
    // validate site with returned token thru proxy.php  
    public string getValidate(string token)
    {
        WebClient webClient = new WebClient();
        webClient.QueryString.Add("response", token);
        return webClient.DownloadString("http://testing-ground.scraping.pro/proxy.php");
    }
}

class Program
{
    static void Main(string[] args)
    {  
        if (args.Length != 1)
        {
            System.Console.WriteLine("Usage: main.exe <2captcha_service_key>");
            return;
        }
        string service_key = args[0];
        // Console.WriteLine("2captcha service key: " + service_key);

        Recaptcha2captcha service = new Recaptcha2captcha();

        // we set 2captcha service key and target google site_key
        service.setServiceKey(service_key);
        service.setSiteKey("6Lf5CQkTAAAAAKA-kgNm9mV6sgqpGmRmRMFJYMz8");
        serivce.service.setPageUrl("http://testing-ground.scraping.pro/recaptcha");

        var resp = service.SendRequest();
        var gcaptchaToken = "";
        Console.WriteLine(resp.Substring( 3, resp.Length-3));
        if (resp.Contains("OK|")){
            // loop till the service solves captcha and gets g-recaptcha-response token
            var i=0;
            while (i++ <= 20)
            {
                System.Threading.Thread.Sleep(5000); // sleep 5 seconds
                Console.WriteLine("Captcha is being solved for {0} seconds", i*5);
                gcaptchaToken = service.getToken(resp.Substring( 3, resp.Length-3));
                if (gcaptchaToken.Contains("OK|"))
                {
                    break;
                }
            }


            if (gcaptchaToken.Contains("OK|"))
            {
                var RecaptchaResponseToken = gcaptchaToken.Substring(3, gcaptchaToken.Length-3);
                Console.WriteLine("g-recaptcha-response token:  " + RecaptchaResponseToken );

                // make google to validate g-recaptcha-response token
                var iSvalid = service.getValidate(RecaptchaResponseToken);
                Console.WriteLine("Token is validated by google: " + iSvalid );

                // submit form to the target site
                var SubmitFormResp = service.SubmitForm(RecaptchaResponseToken);
                Console.WriteLine("Submit form return: " + SubmitFormResp );

            } else {
                Console.WriteLine("Captcha has not been solved. Error code: " + gcaptchaToken);
                //Environment.Exit(0);
            }

        } else {
            Console.WriteLine("Error: " + resp);
            //Environment.Exit(0);
        }
        Console.Read();
    }
}   

2captcha 09-01-2020