如何在表单提交上验证Google reCaptcha

时间:2014-12-12 19:15:07

标签: php html recaptcha

最近,谷歌彻底彻底检查了他们的reCaptcha API,并将其简化为一个复选框。

reCaptcha

问题是,我可以提交包含reCaptcha的表单而不检查它,表单将忽略reCaptcha。

在您必须使用私钥等将表单发送到PHP文件之前,我在他们的开发人员指南中没有看到任何提及。我不知道如何验证表单以确保用户填写新的reCaptcha。

我错过了什么吗?是否仍需要具有私钥的PHP文件?

到目前为止,我所有的reCaptcha都是:

<div data-type="image" class="g-recaptcha" data-sitekey="My Public Key"></div>

12 个答案:

答案 0 :(得分:62)

如果您想检查用户是否点击了I'm not a robot复选框,您可以使用reCaptcha API提供的.getResponse()功能。

如果用户没有验证自己,它将返回一个空字符串,如下所示:

if (grecaptcha.getResponse() == ""){
    alert("You can't proceed!");
} else {
    alert("Thank you");
}

如果用户已经验证了自己,则响应将是一个非常长的字符串。

有关API的更多信息,请访问此页面:reCaptcha Javascript API

答案 1 :(得分:14)

var googleResponse = jQuery('#g-recaptcha-response').val();
if (!googleResponse) {
    $('<p style="color:red !important" class=error-captcha"><span class="glyphicon glyphicon-remove " ></span> Please fill up the captcha.</p>" ').insertAfter("#html_element");
    return false;
} else {            
    return true;
}

把它放在一个函数中。在提交时调用此函数... #html_element是我的空div。

答案 2 :(得分:13)

您可以根据Google reCAPTCHA documentation

以3种方式验证回复
  1. g-recaptcha-response:用户选中复选框(我不是机器人)后,您的HTML中会填充ID为g-recaptcha-response的字段。
    您现在可以使用此字段的值来了解用户是否是机器人,使用下面的mentioed行: -

    var captchResponse = $('#g-recaptcha-response').val();
    if(captchResponse.length == 0 )
        //user has not yet checked the 'I am not a robot' checkbox
    else 
        //user is a verified human and you are good to submit your form now
    
  2. 在您提交表单之前,您可以拨打以下电话: -

    var isCaptchaValidated = false;
    var response = grecaptcha.getResponse();
    if(response.length == 0) {
        isCaptchaValidated = false;
        toast('Please verify that you are a Human.');
    } else {
        isCaptchaValidated = true;
    }
    
    
    if (isCaptchaValidated ) {
        //you can now submit your form
    }
    
  3. 您可以按如下方式显示您的reCAPTCHA: -

    <div class="col s12 g-recaptcha" data-sitekey="YOUR_PRIVATE_KEY" data-callback='doSomething'></div>
    

    然后在JavaScript中定义该函数,该函数也可用于提交表单。

    function doSomething() { alert(1); }
    

    现在,一旦选中了复选框(我不是机器人),您将收到已定义回调的回调,在您的情况下为doSomething

答案 3 :(得分:10)

从用户体验的角度来看,它可以帮助用户明白何时可以继续提交表单 - 通过启用禁用按钮,或者只是使按钮可见。

这是一个简单的例子......

<form>
    <div class="g-recaptcha" data-sitekey="YOUR_PRIVATE_KEY" data-callback="recaptchaCallback"></div>
    <button type="submit" class="btn btn-default hidden" id="btnSubmit">Submit</button>
</form>

<script>
    function recaptchaCallback() {
        var btnSubmit = document.getElementById("btnSubmit");

        if ( btnSubmit.classList.contains("hidden") ) {
            btnSubmit.classList.remove("hidden");
            btnSubmitclassList.add("show");
        }
    }
</script>

答案 4 :(得分:2)

试试这个链接: https://github.com/google/ReCAPTCHA/tree/master/php

该页面的最新信息发布了该页面的链接: https://developers.google.com/recaptcha/intro

我提出的一个阻止这两个文件正常工作的问题是我的网站php.ini文件。确保正确设置此属性,如下所示: allow_url_fopen =开启

答案 5 :(得分:2)

使用JavaScript时对我有用

<script src='https://www.google.com/recaptcha/api.js'></script>
<script>
function submitUserForm() {
    var response = grecaptcha.getResponse();
    if(response.length == 0) {
        document.getElementById('g-recaptcha-error').innerHTML = '<span style="color:red;">This field is required.</span>';
        return false;
    }
    return true;
}
 
function verifyCaptcha() {
    document.getElementById('g-recaptcha-error').innerHTML = '';
}
</script>
<form method="post" onsubmit="return submitUserForm();">
    <div class="g-recaptcha" data-sitekey="YOUR_SITE_KEY" data-callback="verifyCaptcha"></div>
    <div id="g-recaptcha-error"></div>
    <input type="submit" name="submit" value="Submit" />
</form>

答案 6 :(得分:1)

您可以先在前端验证是否已标记复选框:

    var recaptchaRes = grecaptcha.getResponse();
    var message = "";

    if(recaptchaRes.length == 0) {
        // You can return the message to user
        message = "Please complete the reCAPTCHA challenge!";
        return false;
    } else {
       // Add reCAPTCHA response to the POST
       form.recaptchaRes = recaptchaRes;
    }

然后在服务器端使用Google reCAPTCHA API验证收到的响应:

    $receivedRecaptcha = $_POST['recaptchaRes'];
    $verifiedRecaptcha = file_get_contents('https://www.google.com/recaptcha/api/siteverify?secret='.$google_secret.'&response='.$receivedRecaptcha);

    $verResponseData = json_decode($verifiedRecaptcha);

    if(!$verResponseData->success)
    {
        return "reCAPTCHA is not valid; Please try again!";
    }

有关详情,请访问Google docs

答案 7 :(得分:1)

在表单提交后验证Google reCapcha是否有效

if ($post['g-recaptcha-response']) {
      $captcha = $post['g-recaptcha-response'];
      $secretKey = 'type here private key';
      $response = file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=" . $secretKey . "&response=" . $captcha);
        $responseKeys = json_decode($response, true);
        if (intval($responseKeys["success"]) !== 1) {
            return "failed";
        } else {
            return "success";
        }
    }
    else {
        return "failed";
    }

答案 8 :(得分:0)

//validate
$receivedRecaptcha = $_POST['recaptchaRes'];
$google_secret =  "Yoursecretgooglepapikey";
$verifiedRecaptchaUrl = 'https://www.google.com/recaptcha/api/siteverify?secret='.$google_secret.'&response='.$receivedRecaptcha;
$handle = curl_init($verifiedRecaptchaUrl);
curl_setopt($handle,  CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($handle, CURLOPT_SSL_VERIFYPEER, false); // not safe but works
//curl_setopt($handle, CURLOPT_CAINFO, "./my_cert.pem"); // safe
$response = curl_exec($handle);
$httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
curl_close($handle);
if ($httpCode >= 200 && $httpCode < 300) {
  if (strlen($response) > 0) {
        $responseobj = json_decode($response);
        if(!$responseobj->success) {
            echo "reCAPTCHA is not valid. Please try again!";
            }
        else {
            echo "reCAPTCHA is valid.";
        }
    }
} else {
  echo "curl failed. http code is ".$httpCode;
}

答案 9 :(得分:0)

我想到的一个阻止这两个文件正常工作的问题是我的网站的for(int i = 0;i<input.length;i++){ if(repeat(input[i])){ System.out.println("The answer is " + input[i] + " at index " + i); break;//you find it! Now break the loop } } 文件。确保正确设置此属性,如下所示:

php.ini

答案 10 :(得分:-1)

reCaptchareCaptcha DLL文件一起使用时,我们可以在C#中进行验证。

RecaptchaControl1.Validate();
bool Varify = RecaptchaControl1.IsValid;
if (Varify)
{
    // Pice of code after validation.
}

它为我工作。

答案 11 :(得分:-1)

var googleResponse = $('#g-recaptcha-response').val();

if(googleResponse=='')
{   
    $("#texterr").html("<span>Please check reCaptcha to continue.</span>");

    return false;
}