We are going to Integrate ReCaptcha in Angular 8 applications. In this article, we will learn ReCaptcha integration client and server side verification, So let’s get started how to integrate ReCaptcha in Angular 8 application with live demo
Before start Angular 8 ReCaptcha integration. We need a Angular 8 Project. If you don’t know how to create a new angular 8 project. Follow this tutorial.
Create Site Key and Secret Key
To start using reCAPTCHA, you need to sign up for an API key pair for your site. The key pair consists of a site key and secret key. The site key is used to invoke reCAPTCHA service on your site or mobile application. The secret key authorizes communication between your application backend and the reCAPTCHA server to verify the user’s response. The secret key needs to be kept safe for security purposes.
Add a Placeholder
We need to add a placeholder for the ReCaptcha. To add the placeholder, open app.component.html file and put the below html markup
<div class="row mt-5">
<div class="col-md-9 mx-auto">
<h2 class="text-left">Angular 8 - Google ReCaptcha demo</h2>
<div class="card mt-3">
<div class="card-body">
<div #recaptcha ></div>
</div>
</div>
</div>
</div>
Basically we need only <div #recapthca></div> but to looks better i have added some styling.
Next, Open the app.component.ts file and add the below code
@ViewChild('recaptcha', {static: true }) recaptchaElement: ElementRef;
Access <div #recaptcha>: recaptchaElement is a reference to <div # recaptcha> inside app.component.html file. ViewChild directive creates a direct link between <div> element and a recaptchaElement member variable.
Load the Google ReCaptcha Library
Next, Open your component.ts file and add the below method. I am going to add this method on the app.component.ts file
addRecaptchaScript() {
window['grecaptchaCallback'] = () => {
}
(function(d, s, id, obj){
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) { return;}
js = d.createElement(s); js.id = id;
js.src = "https://www.google.com/recaptcha/api.js?onload=grecaptchaCallback&render=explicit";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'recaptcha-jssdk', this));
}
This method will load the Google ReCaptcha Library
You may notice that We have created a grecaptchaCallback method. We have added a callback when the Google ReCaptcha Library will loaded.
Next, Call the above method from ngOnInit () method
ngOnInit() {
this.addRecaptchaScript();
}
Render ReCaptcha
Next, We need to render the ReCaptcha. To render the ReCaptcha add the below method.
renderReCaptcha() {
window['grecaptcha'].render(this.recaptchaElement.nativeElement, {
'sitekey' : 'YOUR_SITE_KEY ',
'callback': (response) => {
console.log(response);
}
});
}
Here, Change the YOUR_SITE_KEY with your site key, Which we have created at the start of this tutorial.
Now, We need to call renderReCaptcha method after the ReCaptcha library loaded. We have to make some changes in the addRecaptchaScript method. We will call the renderReCaptcha method on callback function. After the changes our addRecaptchaScript will look like this
addRecaptchaScript() {
window['grecaptchaCallback'] = () => {
this.renderReCaptcha();
}
(function(d, s, id, obj){
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) { obj.renderReCaptcha(); return;}
js = d.createElement(s); js.id = id;
js.src = "https://www.google.com/recaptcha/api.js?onload=grecaptchaCallback&render=explicit";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'recaptcha-jssdk', this));
}
After the complete all the above steps, our component will looks like this
import { Component, OnInit, ElementRef, ViewChild } from '@angular/core';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
@ViewChild('recaptcha', {static: true }) recaptchaElement: ElementRef;
constructor() { }
ngOnInit() {
this.addRecaptchaScript();
}
renderReCaptch() {
window['grecaptcha'].render(this.recaptchaElement.nativeElement, {
'sitekey' : '6LePbq4UAAAAAPqwJU8u5g1Of1TIEMyoPpJQpyaD',
'callback': (response) => {
console.log(response);
}
});
}
addRecaptchaScript() {
window['grecaptchaCallback'] = () => {
this.renderReCaptch();
}
(function(d, s, id, obj){
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) { obj.renderReCaptch(); return;}
js = d.createElement(s); js.id = id;
js.src = "https://www.google.com/recaptcha/api.js?onload=grecaptchaCallback&render=explicit";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'recaptcha-jssdk', this));
}
}
Verifying the user’s response
We have one ReCaptcha integration with Angular 8, Now we need to verify the user’s response. let’s see how to verify a user’s response to a reCAPTCHA challenge from your application’s backend.
After you get the response token, you need to verify it within two minutes with reCAPTCHA using the following API to ensure the token is valid.
API Request
URL: https://www.google.com/recaptcha/api/siteverify
METHOD: POST
POST Parameter:
| secret | Required. The shared key between your site and reCAPTCHA. |
| response | Required. The user response token provided by the reCAPTCHA client-side integration on your site. |
| remoteip | Optional. The user’s IP address. |
Sample Code For Php
<?php
$data = http_build_query(array(
'secret' => "YOUR_SECRET_KEY",
'response' => "03AOLTBLReNhdz3sTw46RKhiVHu-eLNtu0BvWybASGv1zT9AKzauZPP36zxmGIaapD3wIu9OkPKT5LcHDSZ_scwPfRaT6u9PlDz0gk_OnK8cema0_cOAsGaw7fcFMTQyj9v32talc9L8McnAVOPcNhP_dDpoNxETtAIXSFZOOegTFNYQPvZx6FfTe_Pv4CwRP08T2Cjq8n8KZyge9RMbUdJOYamo3OhuE-9IQ-G_GWj-04en-x3KTcNH7AWfzHRrEJnNT9uKbb5PY6ywtQlpbZ3YKq5HqvbOd1KMkDKgbUCeI5cK0pM3DWLDgBD2mdRGA28IukWSmy_Unn"
));
$curl = curl_init();
$captcha_verify_url = "https://www.google.com/recaptcha/api/siteverify";
curl_setopt($curl, CURLOPT_URL,$captcha_verify_url);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
$captcha_output = curl_exec ($curl);
curl_close ($curl);
$decoded_captcha = json_decode($captcha_output);
print_r($captcha_output);
Here, You need to change the YOUR_SECRET_KEY with your secret key
Running application:
Run the application using ng serve --o
Preview
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