Provided by: libcaptcha-recaptcha-perl_0.98+ds-1_all 
NAME
Captcha::reCAPTCHA - A Perl implementation of the reCAPTCHA API
VERSION
This document describes Captcha::reCAPTCHA version 0.98
NOTICE
Please note this module now allows the use of v2 there are no changes to version 1.
Version 2 has separate methds you can call
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
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 <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:
<http://recaptcha.net/plugins/php/>
To use reCAPTCHA you need to register your site here:
<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"
INTERFACE
"new"
Create a new "Captcha::reCAPTCHA".
"get_options_setter( $options )"
You can optionally customize the look of the reCAPTCHA widget with some JavaScript
settings. "get_options_setter" returns a block of Javascript wrapped in <script> ..
</script> tags that will set the options to be used by the widget.
$options is a reference to a hash that may contain the following keys:
"theme"
Defines which theme to use for reCAPTCHA. Possible values are 'red', 'white' or
'blackglass'. The default is 'red'.
"tabindex"
Sets a tabindex for the reCAPTCHA text box. If other elements in the form use a
tabindex, this should be set so that navigation is easier for the user. Default:
0.
"get_options_setter_div( $pubkey, $options )"
You can optionally customize the look of the reCAPTCHA widget with some settings.
"get_options_setter_div" returns a div element wrapped in <div> .. </div> tags that
will set the options to be used by the widget.
$options is a reference to a hash that may contain the following keys:
"data-theme"
Defines which theme to use for reCAPTCHA. Possible values are 'dark', 'light'. The
default is 'light'.
"data-type"
Defines the type of captcha to server. Possible values are 'audio' or 'image'.
Default is 'image'
"data-size"
Defines the size of the widget. Possible values are 'compact' or 'normal'.
Default is 'normal'
"data-tabindex"
Defines the tabindex of the widget and challenge. If other elements in your page
use tabindex, it should be set to make user navigation easier. Default is 0
"data-callback"
Defines the name of your callback function to be executed when the user submits a
successful CAPTCHA response. The user's response, g-recaptcha-response, will be
the input for your callback function.
"data-expired-callback"
Defines the name of your callback function to be executed when the recaptcha
response expires and the user needs to solve a new CAPTCHA
"get_html_v2( $pubkey, \%options )"
Generates HTML to display the captcha using the new api pubkey is public key for
\%options types the same as get_options_setter
print $captcha->get_html_v2($pubkey, $options);
This uses ssl by default and does not display custom error messages
"get_html( $pubkey, $error, $use_ssl, \%options )"
Generates HTML to display the captcha using api version 1.
print $captcha->get_html( $PUB, $err );
$pubkey
Your reCAPTCHA public key, from the API Signup Page
$error
Optional. If set this should be either a string containing a reCAPTCHA status code
or a result hash as returned by "check_answer".
$use_ssl
Optional. Should the SSL-based API be used? If you are displaying a page to the
user over SSL, be sure to set this to true so an error dialog doesn't come up in
the user's browser.
$options
Optional. A reference to a hash of options for the captcha. See
"get_options_setter" for more details.
Returns a string containing the HTML that should be used to display the captcha.
"check_answer_v2"
After the user has filled out the HTML form, including their answer for the CAPTCHA,
use "check_answer" to check their answer when they submit the form. The user's answer
will be in field, g-recaptcha-response. The reCAPTCHA library will make an HTTP
request to the reCAPTCHA server and verify the user's answer.
$privkey
Your reCAPTCHA private key, from the API Signup Page.
$remoteip
The user's IP address, in the format 192.168.0.1 (optional)
$response
The value of the form field recaptcha_response_field.
Returns a reference to a hash containing two fields: "is_valid" and "error".
my $result = $c->check_answer_v2(
'your private key here', $response,
$ENV{'REMOTE_ADDR'}
);
my $result = $c->check_answer_v2(
'your private key here', $response,
$ENV{'REMOTE_ADDR'}
);
if ( $result->{is_valid} ) {
print "Yes!";
}
else {
# Error
$error = $result->{error};
}
See the /examples subdirectory for examples of how to call "check_answer_v2".
Note: this method will make an HTTP request to Google to verify the user input. If
this request must be routed via a proxy in your environment, use the standard
environment variable to specify the proxy address, e.g.:
$ENV{http_proxy} = 'http://myproxy:3128';
"check_answer"
After the user has filled out the HTML form, including their answer for the CAPTCHA,
use "check_answer" to check their answer when they submit the form. The user's answer
will be in two form fields, recaptcha_challenge_field and recaptcha_response_field.
The reCAPTCHA library will make an HTTP request to the reCAPTCHA server and verify the
user's answer.
$privkey
Your reCAPTCHA private key, from the API Signup Page.
$remoteip
The user's IP address, in the format 192.168.0.1.
$challenge
The value of the form field recaptcha_challenge_field
$response
The value of the form field recaptcha_response_field.
Returns a reference to a hash containing two fields: "is_valid" and "error".
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};
}
See the /examples subdirectory for examples of how to call "check_answer_v1".
Note: this method will make an HTTP request to Google to verify the user input. If
this request must be routed via a proxy in your environment, use the standard
environment variable to specify the proxy address, e.g.:
$ENV{http_proxy} = 'http://myproxy:3128';
CONFIGURATION AND ENVIRONMENT
Captcha::reCAPTCHA requires no configuration files or environment variables.
To use reCAPTCHA sign up for a key pair here:
<https://www.google.com/recaptcha/admin/create>
DEPENDENCIES
LWP::UserAgent, HTML::Tiny
INCOMPATIBILITIES
None reported .
BUGS AND LIMITATIONS
Please see below link
https://rt.cpan.org/Public/Dist/Display.html?Name=Captcha-reCAPTCHA
Please report any bugs or feature requests to "bug-captcha-recaptcha@rt.cpan.org", or
through the web interface at <http://rt.cpan.org>.
AUTHOR
Mainainted by Sunny Patel "<sunnypatel4141@gmail.com>" Please report all bugs to Sunny
Patel
Version 0.95-0.97 was maintained by Fred Moyer "<fred@redhotpenguin.com>"
Original Author Andy Armstrong "<andy@hexten.net>"
LICENCE AND COPYRIGHT
Copyright (c) 2007, Andy Armstrong "<andy@hexten.net>". All rights reserved.
This module is free software; you can redistribute it and/or modify it under the same
terms as Perl itself. See perlartistic.
DISCLAIMER OF WARRANTY
BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE,
TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE
COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF
ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO
THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE
DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT
HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE SOFTWARE AS PERMITTED BY
THE ABOVE LICENCE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY
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SUCH DAMAGES.