ReCaptcha Audio

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Usage in ZennoPoster

To send audio captchas from ZennoPoster, you can use the snippet we have prepared:

//Main settings
 
// waiting timeout
var waitTime = 1000;
// recognition attempts
var tryRecognize = 10;
// attempts to load element
var tryLoadElement = 60;
// show recognizing progress messages
var needShowMessages = false;
// need to check answer's correctness
var needToCheck = true;
 
// Additional variables
 
// tab
var tab = instance.ActiveTab;
// congratulations, you are not robot
var success = false;
// audio file
var file = string.Empty;
// file has been deleted
var fileDeleted = true;
// answer to audio captcha
var answer = string.Empty;
// ReCaptcha 1
var isRecaptcha1 = false;
// timeout exceeded 
var timeout = false;
// error loading file
var fileLoadingError = false;
var usedURLs = new List<string>();
var isFirstAttempt = true;
var coincidenceReCaptcha2Index = -1;
 
// Searching audio button element
Action TryOpenAudioForm = () => {
for (int k = 0; k < tryLoadElement; k++)
{
var audioButton = tab.FindElementById("recaptcha-audio-button");
// if found
if (!audioButton.IsVoid)
{
// press button
audioButton.Click();
tab.WaitDownloading();
break;
}
System.Threading.Thread.Sleep(waitTime); // pause
if (k == (tryLoadElement - 1)) timeout = true;
}
System.Threading.Thread.Sleep(waitTime); // pause
};
 
Action OpenAudioTask= () => {
project.SendInfoToLog("Loading audio task", needShowMessages);
//checking task type in the form
var task = tab.FindElementByAttribute("div", "class", "rc-imageselect-desc-wrapper", "regexp", 0);
if (!task.IsVoid) TryOpenAudioForm(); // graphic task has been found, then loading audio
};
 
Action VisibleIndexReCaptchaDefinition= () => {
var recaptchaElementsGroup = tab.FindElementsByAttribute("div", "class", "recaptcha-checkbox-checkmark", "regexp");
int length = recaptchaElementsGroup.Elements.Length;
if (length == 1)
{
coincidenceReCaptcha2Index = 0;
return;
}
 
for(int i = 0; i < length; i++)
{
var element = recaptchaElementsGroup.Elements[i];
if (!element.IsVoid)
{
int x = element.DisplacementInTabWindow.X;
int y = element.DisplacementInTabWindow.Y;
 
var suspectVisibleElement = tab.GetElementFromPoint(x, y).DisplacementInTabWindow;
if (x == suspectVisibleElement.X && y == suspectVisibleElement.Y && element.Width != 0 && element.Height != 0 && x != 0 && y != 0)
{
coincidenceReCaptcha2Index = i;
break;
}
}
}
};
 
// Identifying ReCaptcha version
Action NotRobotClick= () => {
for (int k = 0; k < tryLoadElement; k++)
{
VisibleIndexReCaptchaDefinition();
if (coincidenceReCaptcha2Index < 0) coincidenceReCaptcha2Index = 0;
 
// поиск кнопки "Я не робот"
HtmlElement notRobot = tab.FindElementByAttribute("div", "class", "recaptcha-checkbox-checkmark", "regexp", coincidenceReCaptcha2Index);
 
// кнопка существует
if (!notRobot.IsVoid)
{
// клик по кнопке
notRobot.Click();
System.Threading.Thread.Sleep(waitTime); // подождём немного
 
// если ввод каптчи не требуется
var check = tab.FindElementByAttribute("div", "class", "recaptcha-checkbox-checkmark", "regexp", coincidenceReCaptcha2Index);
if (!check.IsVoid)
{
if (check.OuterHtml.Contains("style=\"\""))
{
success = true;
timeout = false;
break;
}
}
}
 
// Форма существует
var loadedForm = tab.FindElementByAttribute("div", "class", "primary-controls", "regexp", 0);
if (!loadedForm.IsVoid)
break;
 
// checking if ReCaptcha 1 audio button exists
HtmlElement r1 = tab.FindElementById("recaptcha_switch_audio");
if (!r1.IsVoid)
{
r1.Click();
isRecaptcha1 = true;
break;
}
 
// подождём загрузки элементов
System.Threading.Thread.Sleep(waitTime);
if (k == (tryLoadElement - 1)) timeout = true;
}
};
 
// Downloading mp3 file
Action GetAudioFile= () => {
 
var href = String.Empty;
 
// getting audio task
for (int k = 0; k < tryLoadElement; k++)
{
if (isRecaptcha1)
{
var audioChallenge = tab.FindElementByAttribute("a", "id", "recaptcha_audio_download", "text", 0);
// if found, getting link to audio file
if (!audioChallenge.IsVoid)
{
href = audioChallenge.GetAttribute("href");
break;
}
else System.Threading.Thread.Sleep(waitTime);
}
else
{
if (isFirstAttempt)
{
isFirstAttempt = false;
}
else
{
var reload = tab.FindElementById("recaptcha-reload-button");
if (!reload.IsVoid)
{
reload.Click();
tab.WaitDownloading();
}
}
 
var audioChallenge = tab.FindElementByAttribute("a", "class", "rc-audiochallenge-tdownload-link", "regexp", 0);
// if found, getting link to audio file
if (!audioChallenge.IsVoid)
{
href = audioChallenge.GetAttribute("href");
break;
}
System.Threading.Thread.Sleep(waitTime); // waiting when form will be loaded
}
if (k == (tryLoadElement - 1)) timeout = true;
}
 
foreach (var usedUrl in usedURLs)
{
if (usedUrl.Contains(href))
throw new Exception("new audio file is absent");
}
usedURLs.Add(href);
 
project.SendInfoToLog("Downloading audio file", needShowMessages);
try
{
var proxy = instance.GetProxy();
var respType = ZennoLab.InterfacesLibrary.Enums.Http.ResponceType.File;
var timeoutRequest = 30000;
var cookies = instance.GetCookie("google.com", true);
var userAgent = project.Profile.UserAgent;
var maxRedirectCount = 1;
var downloadPath = project.Directory + "\\audiofiles";
file = ZennoPoster.HttpGet(href, proxy, "UTF8", respType, timeoutRequest, cookies, userAgent, false, maxRedirectCount, null, downloadPath);
fileDeleted = false;
}
catch (Exception ex)
{
throw new Exception("Failed to download audio file");
}
};
 
Action Recognize= () => {
project.SendInfoToLog("Recognizing", needShowMessages);
try 
{
if (!File.Exists(file)) 
{
fileLoadingError = true;
fileDeleted = true;
return;
}
var bytes = File.ReadAllBytes(file);
if (bytes.Length < 1024)
{
fileLoadingError = true;
return;
}
 
var hexStringBuilder = new StringBuilder(2);
for (var i = 0; i < 2; i++)
hexStringBuilder.AppendFormat("{0:x2}", bytes[i]);
 
var header_prefix = hexStringBuilder.ToString();
if (!header_prefix.Equals("ffe3"))
{
fileLoadingError = true;
                        throw new Exception("Your IP was banned!");
return;
}
 
string str = Convert.ToBase64String(bytes);
var rc = ZennoPoster.CaptchaRecognition("CapMonster2.dll", str, "CapMonsterModule=ZennoLab.AudioReCaptcha&ParallelMode=true");
var split = rc.Split(new [] {"-|-"}, StringSplitOptions.RemoveEmptyEntries);
if (split.Length > 0)
answer = split[0];
        if (answer.Contains("133193320491090004119440")) throw new Exception("Your IP was banned!");
} 
finally 
{
    if (File.Exists(file)) 
    {
File.Delete(file);
fileDeleted = true;
        }
}
};
 
Action InputAnswer= () => {
if (!String.IsNullOrEmpty(answer) && answer != "sorry")
{
project.SendInfoToLog("Inserting answer", needShowMessages);
HtmlElement audioAnswerInput = null;
// searching answer input field
if (isRecaptcha1)
{
audioAnswerInput = tab.FindElementByAttribute("input:text", "id", "recaptcha_response_field", "text", 0);
}
else
{
audioAnswerInput = tab.FindElementByAttribute("input:text", "id", "audio-response", "regexp", 0);
}
 
// if found
if (!audioAnswerInput.IsVoid)
{
// inserting answer
audioAnswerInput.SetValue(answer, "None", false);
}
 
// pause
System.Threading.Thread.Sleep(waitTime);
}
else throw new Exception("Answer not received");
};
 
// Verifying
Action SubmitAnswer= () => {
// searching "Verify" button
HtmlElement apply = tab.FindElementById("recaptcha-verify-button");
 
if (!apply.IsVoid) apply.Click();
tab.WaitDownloading();
 
// pause
System.Threading.Thread.Sleep(waitTime);
};
 
// Checking if answer is correct for ReCaptcha 2
Action Check= () => {
project.SendInfoToLog("Verifying answer", needShowMessages);
tab.WaitDownloading();
 
for (int k = 0; k < tryLoadElement; k++)
{
System.Threading.Thread.Sleep(waitTime);
 
var checkAnswer = tab.FindElementByAttribute("div", "class", "recaptcha-checkbox-checkmark", "regexp", coincidenceReCaptcha2Index);
 
// проверка исчезновения формы
var loadedForm = tab.FindElementByAttribute("div", "class", "primary-controls", "regexp", 0);
if (loadedForm.IsVoid)
{
success = true;
break;
}
else
{
int xPrimaryControlsDisplaysment = loadedForm.DisplacementInTabWindow.X;
int yPrimaryControlsDisplaysment = loadedForm.DisplacementInTabWindow.Y;
 
if (xPrimaryControlsDisplaysment < 0 || yPrimaryControlsDisplaysment < 0) // there are no visible recaptcha
{
success = true;
break;
}
 
if (checkAnswer.IsVoid)
break;
}
 
var recaptchas = tab.FindElementsByAttribute("div", "class", "recaptcha-checkbox-checkmark", "regexp");
if (recaptchas.Count == 0)
{
success = true;
return;
}
 
if (!checkAnswer.IsVoid)
{
if (checkAnswer.OuterHtml.Contains("style=\"\""))
success = true;
else
success = false;
return;
}
if (k == (tryLoadElement - 1)) timeout = true;
}
};
 
// Checking "I'm not robot" checkbox
NotRobotClick();
if (success) return "ok";
 
// trying to recognize ReCaptcha
for (int i = 0; i < tryRecognize; i++)
{
if (!isRecaptcha1) OpenAudioTask();
if (timeout) break;
GetAudioFile();
if (timeout) break;
 
Recognize();
if (fileLoadingError) 
{
fileLoadingError = false;
continue;
}
if (timeout) break;
InputAnswer();
if (timeout) break;
if (!fileDeleted)
{
if (File.Exists(file))
{
File.Delete(file);
fileDeleted = true;
}
}
 
if (isRecaptcha1) return "ok";
SubmitAnswer();
 
if (!needToCheck) return "ok";
 
if (timeout) break;
Check();
if (success) return "ok";
}
 
if (timeout) throw new Exception("Loading element timeout is exceeded");
else throw new Exception("Not recognized, Attempts to recognize were ended, before the response was received");

Note

The snippet also works when an old or telephone user agent is used in the browser.

It is imperative to use a proxy, because after 3-5 recognized captchas from one IP, ReCaptcha denies access to the audio file.

If ReCaptcha is not recognized the first time, the snippet will try a second time. The number of attempts to load elements, the waiting time, the number of attempts to recognize the captcha and the need to check the correctness of the answer can be changed using the variables:

// wait time
var waitTime = 1000;
// number of attempts to recognize
var tryRecognize = 10;
// number of attempts to load an element
var tryLoadElement = 60;
// check the correctness of the recognized response
var needToCheck = true;
// show messages about the progress of recognition
var needShowMessages = false;

The function of sending captcha to the service looks like this:

ZennoPoster.CaptchaRecognition("CapMonster2.dll", str, "CapMonsterModule=ZennoLab.AudioReCaptcha&ParallelMode=true");

, where the CapMonster2.dll service parameters are listed separated by "&": specifying the module name and setting up recognition in parallel mode, respectively.

English Help ZennoLab

ReCaptcha Audio

Table of contents

Usage in ZennoPoster

Note