RECaptcha v1 integration for Codeigniter

NOTICE: Google has stopped supporting reCAPTCHA v1 - all new API keys created on their website will only work for v2 - As v2 is a javascript implementation there seems to be no need for any special handling between the code and codeigniter itself.

Support for this library will no longer continue as its considered to reach its end of life any moment! Please use the new, more secure, less annoying reCAPTCHA from Google (v2+) https://www.google.com/recaptcha/intro/index.html

Thanks to all the contributors who has participated on this project!

CONTRIBUTE:

You are welcome to contribute to this code! Fork and submit your pull requests as you finish.

SETUP:

Copy Folder config and libraries to ./application

Edit ./application/config/recaptcha.php to update public and private key obtained from google here:

•      https://www.google.com/recaptcha/admin/create?app=Codeigniter
  

•      -> Use this URL for addressing the use of CodeIgniter - so that Google may discover it and host it on their site. 
  

• Setup is done.

HOW IT WORKS:

Load using CI: $this->load->library('recaptcha');

Get the HTML for the recaptcha: $this->recaptcha->recaptcha_get_html();

ex.

$this->load->library('recaptcha');
                    $data['recaptcha_html'] = $this->recaptcha->recaptcha_get_html();
                    $data['page'] = 'login/login';
                    $this->load->view(plane,$data);

On the website use this inside the form.

wherever you want the captcha.

Check the REcaptcha with the following function when submitted.

Run this code:

$this->recaptcha->recaptcha_check_answer();

Or this, if you have changed fieldnames:

$this->recaptcha->recaptcha_check_answer(
                    $_SERVER['REMOTE_ADDR'],
                    $this->input->post('recaptcha_challenge_field'),
                    $this->input->post('recaptcha_response_field'));

Check if the captcha was correct with:

$this->recaptcha->getIsValid() (BOOLEAN)

If it returns false, check errors with:

$this->recaptcha->getError()

EXAMPLE CODE

<?php

class Login extends MY_Controller {

	function  __construct()  {
        parent::__construct();
    }
        //Loads the login form if the user isnt logged in - redirects to root folder elseif. 
	public function index() {
	   
	       //Checks to see if the user is logged in
		if ($this->session->userdata('logged_in') == false)
		{
                    
                    $this->load->library('recaptcha');
                    
                    //Store the captcha HTML for correct MVC pattern use.
                    $data['recaptcha_html'] = $this->recaptcha->recaptcha_get_html();
                    
                    $data['page'] = 'login/login';
                    $this->load->view('login_template',$data); 
                    
                    
                    
                    
            }
        }
	
	//Gets called by the submit-form
	public function submit() {
	
	           //Load REcaptcha again.
                $this->load->library('recaptcha');
                
            //Check if anything is submitted at all
		if ($this->input->post('username') !== FALSE && $this->input->post('password') !== FALSE) 
		{
		          //Call to recaptcha to get the data validation set within the class. 
                    $this->recaptcha->recaptcha_check_answer();
                    
                    //Store the username and password for easier access
                    $username = $this->input->post('username');
                    $password = $this->input->post('password');
                    
                    
                    
                    if ($username == "user" && $password == "password" && $this->recaptcha->getIsValid()) {
                        
                        $this->session->set_userdata('logged_in','yes');
                        $this->session->set_userdata('user_id','test');
                        
                        redirect('');
                    } else {
                        if(!$this->recaptcha->getIsValid()) {
                            $this->session->set_flashdata('error','incorrect captcha');
                        } else {
                            $this->session->set_flashdata('error','incorrect credentials');
                        }
                        
                        
                        
                        redirect('login');
                    }
                    
		} else { redirect(''); }
	}//.submit()
	

}

Add this to the login webpage template.

    <html><body>
    <form action="login/submit" method="post">
    <span class="loginerror"> <?php if ($this->session->flashdata('error') !== FALSE) { echo $this->session->flashdata('error'); } ?></span>
    <span style="margin-top: 10px;	float: right;">
		            
    </span>
    <input  type="text" name="username" placeholder="username">
		 
    <input type="password" name="password" placeholder="password">
		 
		       
		 
    <input type="submit" value="log in">
    <span style="margin-top: 5px;	float: left;">
    <a href="#test" data-toggle="modal">Forgotten password</a>
    </span>
    <p><a href="<?php echo $this->recaptcha->recaptcha_get_signup_url(); ?>" >Get your API Code HERE</a></p>
    <?php echo $recaptcha_html; ?>
    </form>
    </html></body>