How to Verify Google Recaptcha V3 Response

2019-03-24 01:17发布

站内问答 / PHP
2018 4 2

How to integrate Google reCAPTCHA Version 3 in Client Side and Server Side(php). following code use to display recaptcha but its not working good. How to do this integration.

<html>

<head>
  <script src='https://www.google.com/recaptcha/api.js?render=6Le7-FkUAAAAADDSsTVBvpoUB5MkesNKgPVemFf-UD'></script>
</head>

<body>
  <script>
    grecaptcha.ready(function() {
      grecaptcha.execute('6Le7-FkUAAAAADDSsTVBvpoUB5MkesNKgPVemFf-UD', {
        action: 'action_name'
      });
    });
  </script>

  <form action="verify.php" method="post">
    <input type="text" name="name" placeholder="Your name" required>
    <input type="email" name="email" placeholder="Your email address" required>
    <textarea name="message" placeholder="Type your message here...." required></textarea>

    <input type="submit" name="submit" value="SUBMIT">

  </form>

</body>

</html>

Verify.php

<?php

    if(isset($_POST['g-recaptcha-response']) && !empty($_POST['g-recaptcha-response'])) {
        //your site secret key
        $secret = '6Le7-FkUAAAAAAJq065QqoXNvqJrtmlezcmvFMxHD';
        //get verify response data
        $verifyResponse = file_get_contents('https://www.google.com/recaptcha/api/siteverify?secret='.$secret.'&response='.$_POST['g-recaptcha-response']);
        $responseData = json_decode($verifyResponse);
        if($responseData->success):

             print_r("Working Fine"); exit;
        else:
             print_r("No valid Key"); exit;
        endif;
    } else {
        print_r("Not Working Captcha"); exit;
    }

?>

4条回答
Animai°情兽
2楼-- · 2019-03-24 01:48

Here is a sample working code with the demo.

html side code

<html>
  <head>
    <title>Google recapcha v3 demo - Codeforgeek</title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
      <script src="https://www.google.com/recaptcha/api.js?render=put your site key here"></script>
  </head>
  <body>
    <h1>Google reCAPTHA Demo</h1>
    <form id="comment_form" action="form.php" method="post" >
      <input type="email" name="email" placeholder="Type your email" size="40"><br><br>
      <textarea name="comment" rows="8" cols="39"></textarea><br><br>
      <input type="submit" name="submit" value="Post comment"><br><br>
    </form>
      <script>
       // when form is submit
    $('#comment_form').submit(function() {
        // we stoped it
        event.preventDefault();
        var email = $('#email').val();
        var comment = $("#comment").val();
        // needs for recaptacha ready
        grecaptcha.ready(function() {
            // do request for recaptcha token
            // response is promise with passed token
            grecaptcha.execute('put your site key here', {action: 'create_comment'}).then(function(token) {
                // add token to form
                $('#comment_form').prepend('<input type="hidden" name="g-recaptcha-response" value="' + token + '">');
                    $.post("form.php",{email: email, comment: comment, token: token}, function(result) {
                            console.log(result);
                            if(result.success) {
                                    alert('Thanks for posting comment.')
                            } else {
                                    alert('You are spammer ! Get the @$%K out.')
                            }
                    });
            });;
        });
  });
  </script>
  </body>
</html>

PHP code.

<?php

        $email;$comment;$captcha;
        if(isset($_POST['email'])){
          $email=$_POST['email'];
        }if(isset($_POST['comment'])){
          $comment=$_POST['comment'];
        }if(isset($_POST['token'])){
          $captcha=$_POST['token'];
          }
        if(!$captcha){
          echo '<h2>Please check the the captcha form.</h2>';
          exit;
        }
        $secretKey = "put your secret key here";
        $ip = $_SERVER['REMOTE_ADDR'];

        // post request to server

        $url =  'https://www.google.com/recaptcha/api/siteverify?secret=' . urlencode($secretKey) .  '&response=' . urlencode($captcha);
        $response = file_get_contents($url);
        $responseKeys = json_decode($response,true);
        header('Content-type: application/json');
        if($responseKeys["success"]) {
                echo json_encode(array('success' => 'true'));
        } else {
                echo json_encode(array('success' => 'false'));
        }
?>

Its working fine.

Demo: https://demo.codeforgeek.com/recaptcha-v3/

tutorial: https://codeforgeek.com/2019/02/google-recaptcha-v3-tutorial/

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爷的心禁止访问
3楼-- · 2019-03-24 01:53

I'd like to give you a complete workflow to integrate recaptchav3 into an ASP.NET core MVC solution.

in your appsettings.json file:

  "RecaptchaSettings": {
    "Uri": "https://www.google.com/recaptcha/api/siteverify",
    "SecretKey": "your private key"
    "SiteKey": "your public key",
    "Version": "v3"
  }

in your view (@razor syntax):

@using Microsoft.Extensions.Configuration
@inject IConfiguration Configuration

<script src="https://www.google.com/recaptcha/api.js?render=@Configuration.GetSection("RecaptchaSettings")["SiteKey"]"></script>

    <script>
        grecaptcha.ready(function () {
            grecaptcha.execute('@Configuration.GetSection("RecaptchaSettings")["SiteKey"]',  { action: 'homepage' })
                .then(function (token) {

                    document.getElementById('g-recaptcha-response').value = token;
                });
        });
    </script>

and in your form put this:

<form action="/">
…
<input type="hidden" id="g-recaptcha-response" name="g-recaptcha-response">
…

</form>

I create a simple method to manage it:

public async Task<bool> ChallengePassed(string uri, string gRecaptchaResponse, string secret)
        {

            var concUri = uri + "?secret=" + secret + "&response=" + gRecaptchaResponse;

            var request = new HttpRequestMessage(HttpMethod.Get, concUri);
            var res = await _Client.SendAsync(request);

            if (!res.IsSuccessStatusCode)
            {
                return false;
            }

            var data = await res.Content.ReadAsStringAsync();

            dynamic JSONdata = JObject.Parse(data);
            if (JSONdata.success != "true")
            {
                return false;
            }

            return true;
        }

        #endregion

        #region PRIVATE

        #endregion

        #endregion

        #endregion
    }

and simply I called it into a Controller:

 //recaptcha validation

    bool isChallengeOk = await _CaptchaVerify.ChallengePassed(_Configuration.GetValue<string>("RecaptchaSettings:Uri"), Request.Form["g-recaptcha-response"], _Configuration.GetValue<string>("RecaptchaSettings:SecretKey"));

notice that I'm setting the input parameters from the "_Configuration" object, that represents an instance of configuration setting object in Startup.cs. You can pass manually input parameters to the method.

Enjoy it

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The star\"
4楼-- · 2019-03-24 02:00

Try this.

<script>
  grecaptcha.ready(function() {
   grecaptcha.execute('<site-secret>', {action: 'MyForm'})
   .then(function(token) {
    console.log(token)
    document.getElementById('g-recaptcha-response').value =    token;
   }); 
  }); 
 </script> 

<form action="verify.php" method="post">
  <input type="hidden" id="g-recaptcha-response" name="g-recaptcha-response">
  <input type="text" name="name" placeholder="Your name" required >
  <input type="email" name="email" placeholder="Your email address" required>
  <input type="submit" name="submit" value="SUBMIT" >
</form>
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劫难
5楼-- · 2019-03-24 02:02 
<html>
    <head>
        <script src='https://www.google.com/recaptcha/api.js?render=6Le7-FkUAAAAADDSsTVBvpoUB5MkesNKgPVemFf-UD'></script>
    </head>
    <body> 
    <script>
    // when form is submit
    $('form').submit(function() { 
        // we stoped it
        event.preventDefault();
        // needs for recaptacha ready
        grecaptcha.ready(function() {
            // do request for recaptcha token
            // response is promise with passed token
            grecaptcha.execute('6Le7-FkUAAAAADDSsTVBvpoUB5MkesNKgPVemFf-UD', {action: 'create_comment'}).then(function(token) {
                // add token to form
                $('form').prepend('<input type="hidden" name="token" value="' + token + '">');
                $('form').prepend('<input type="hidden" name="action" value="create_comment">');
                // submit form now
                $('form').unbind('submit').submit();
            });;
        });
    });

    </script>

    <form action="verify.php" method="post">
        <input type="text" name="name" placeholder="Your name" required >
        <input type="email" name="email" placeholder="Your email address" required>
        <textarea name="message" placeholder="Type your message here...." required></textarea>   

        <input type="submit" name="submit" value="SUBMIT">

    </form>

    </body>

</html>

php

$token = $_POST['token'];
$secret = 'ur secret';
$action = $_POST['action'];
// now you need do a POST requst to google recaptcha server.
// url: https://www.google.com/recaptcha/api/siteverify.
// with data secret:$secret and response:$token

At this point in the code, you will need to do a post request to ReCAPTCHA to verify the token, as documented here: https://www.google.com/recaptcha/api/siteverify. The response will be a json object with field "success" (true/false) and "action" for comparison (==) and score (number from 0.0 - 1.0)

https://developers.google.com/recaptcha/docs/v3#api-response.

You can also specify action name for each request (create_post, update_post, create_comment ...)

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