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lib/Captcha/reCAPTCHA.pm  view on Meta::CPAN

package Captcha::reCAPTCHA;

use warnings;
use strict;
use Carp;
use LWP::UserAgent;
use HTML::Tiny;

our $VERSION = '0.99';

use constant API_SERVER => 'http://www.google.com/recaptcha/api';
use constant API_SECURE_SERVER =>
 'https://www.google.com/recaptcha/api';
use constant API_VERIFY_SERVER => 'http://www.google.com';
use constant API_VERIFY_SERVER_V2 => 'https://www.google.com/recaptcha/api/siteverify';
use constant SERVER_ERROR      => 'recaptcha-not-reachable';
use constant API_V2_SERVER => 'https://www.google.com/recaptcha/api.js';

=head1 NAME

Captcha::reCAPTCHA - A Perl implementation of the reCAPTCHA API

=head1 VERSION

This document describes Captcha::reCAPTCHA version 0.99

=head1 NOTICE

Please note this module now allows the use of v2
there are no changes to version 1.
Version 2 has seperate methds you can call

=cut

=head1 SYNOPSIS

Note this release contains methods that use

    use Captcha::reCAPTCHA;

    my $c = Captcha::reCAPTCHA->new;

    # Output form New Version
    print $c->get_html_v2( 'your public key here' );

    # Version 1 (not recommended)
    print $c->get_html( 'your public key here' );

    # Verify submission
    my $result $c->check_answer_v2($private_key, $response, $ENV{REMOTE_ADDR});

    # Verify submission (Old Version)
    my $result = $c->check_answer(
        'your private key here', $ENV{'REMOTE_ADDR'},
        $challenge, $response
    );

    if ( $result->{is_valid} ) {
        print "Yes!";
    }
    else {
        # Error
        $error = $result->{error};
    }

For complete examples see the /examples subdirectory

=head1 DESCRIPTION

reCAPTCHA version 1 is a hybrid mechanical turk and captcha that allows visitors
who complete the captcha to assist in the digitization of books.

From L<http://recaptcha.net/learnmore.html>:

    reCAPTCHA improves the process of digitizing books by sending words that
    cannot be read by computers to the Web in the form of CAPTCHAs for
    humans to decipher. More specifically, each word that cannot be read
    correctly by OCR is placed on an image and used as a CAPTCHA. This is
    possible because most OCR programs alert you when a word cannot be read
    correctly.

version 1 of Perl implementation is modelled on the PHP interface that can be
found here:

L<http://recaptcha.net/plugins/php/>

To use reCAPTCHA you need to register your site here:

L<https://www.google.com/recaptcha/admin/create>


Version 2 is a new and eaasy to solve captcha that is
"easy for humans to solve, but hard for 'bots' and other malicious software"

=head1 INTERFACE

=over

=item C<< new >>

Create a new C<< Captcha::reCAPTCHA >>.

=cut

sub new {
  my $class = shift;
  my $self = bless {}, $class;
  $self->_initialize( @_ );
  return $self;
}