reCAPTCHA v2 install on OTRS 6.0.17 (Centos 7)

[altronrain]

Hello!
I'm pretty new to OTRS in terms of configuration/administration. I have a task to add reCAPTCHA to customer registration process. I tried to follow instructions from OTRS 5.0.X reCaptcha thread here (viewtopic.php?f=60&t=33699) but that not helped me.
So, what i've done:
1) Installed Captcha::reCAPTCHA module using cpan;
2) Copied Kernel/System/Web/InterfaceCustomer.pm to Custom directory (including subdirectory creation as Custom/Kernel...);
Same for Kernel/Output/HTML/Layout.pm and Kernel/Output/HTML/Templates/Standart/CustomerLogin.tt;
3) Implemented changes to Layout.pm as suggested:

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use Captcha::reCAPTCHA;

in use section and

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#begin recaptcha
        my $rc = Captcha::reCAPTCHA->new;
        my $rccustom = "<script type= \"text/javascript\">\n
var RecaptchaOptions = {\n
   lang : 'ru',
};\n
</script>\n";
        $Param{reCAPTCHA} = $rccustom . $rc->get_html("my_pub_key"); #public key
        #end recaptcha

inside /or after? account creation block;

Added

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<!--begin recaptcha -->
                    <div class="NewLine">

                        [% Data.reCAPTCHA %]

                    </div>
                    <!-- end recaptcha -->

inside CustomerLogin.tt before button CreateAccount lines;

And

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use Captcha::reCAPTCHA;

+

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#check reCAPTCHA
        my $rc = Captcha::reCAPTCHA->new;
        my $challenge = $ParamObject->GetParam(Param => 'recaptcha_challenge_field') || '';
        my $response = $ParamObject->GetParam(Param => 'recaptcha_response_field') || '';
        my $result = $rc->check_answer("my_sec_key", $ENV{'REMOTE_ADDR'}, # private key
           $challenge, $response
           );
        if ( !$result->{is_valid} ) {
            my $Output = $LayoutObject->CustomerHeader(
                Area  => 'Core',
                Title => 'Error'
            );
            $Output .= $LayoutObject->CustomerWarning(
                Message => 'reCAPTCHA entry failed.',
                Comment => 'Please press Back and try again.'
            );
            $Output .= $LayoutObject->CustomerFooter();
            $LayoutObject->Print( Output => \$Output );
            exit 0;
        }
        #end recaptcha

to InterfaceCustomer.pm

All changes made to Custom/Kernel... file copies.

4) After all manipulations all i get is 500 Internal error message on all otrs pages. What should i do to configure reCAPTCHA to OTRS 6 properly? (Can't find any instructions. Maybe smth in reCAPTCHA module changed or OTRS itself?)

[altronrain]

Okay, I made a little progress. Apache log says that i missed Captcha/reCAPTCHA.pm e.t.c. (even when i installed it under root and under otrs user separately). So i just copied needed files to one of @INC directories. After this Captcha started to work correctly. BUTI figured out that its v1 that shutdown already... So I need help to deal with v2 now.
(And could someone tell me how to properly configure Core.Login.css with Slider and PreLogin values cause customers can see (New password request fields that way (400px both))

[crythias]

note the new stuff for v2:
https://metacpan.org/pod/Captcha::reCAPTCHA

get_html_v2 vs get_html
check_answer_v2 has a new format:
my $private_key = 'my_secure_key';
my $result = $rc->check_answer_v2($private_key, $response, $ENV{REMOTE_ADDR});

as for the slider ... maybe I can check another time.

[altronrain]

yeah. Also discovered this yesterday evening. There are even Captcha::reCAPTCHA::v2 module (but idk how to configure its syntax).
So, i reconfigured Layout.pm:

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#begin recaptcha
        my $rc = Captcha::reCAPTCHA->new;
        my $rccustom = "<script type= \"text/javascript\">\n
var RecaptchaOptions = {\n
   lang : 'ru',
};\n
</script>\n";
        #my $html = $rc->html ('pub_key', { theme => 'white' });
        $Param{reCAPTCHA} = $rccustom . $rc->get_html_v2('pub_key'); #public key
        #end recaptcha

Then tried to do the same to InterfaceCustomer:

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#check reCAPTCHA
        my $rc = Captcha::reCAPTCHA->new;
        #my $challenge = $ParamObject->GetParam(Param => 'recaptcha_challenge_field') || ''; 
        my $response = $ParamObject->GetParam(Param => 'recaptcha_response_field') || '';
        #my $
        my $result = $rc->check_answer_v2('sec_key', $response, $ENV{'REMOTE_ADDR'}#, # private key
           #$challenge, $response
           );
        if ( !$result->{is_valid} ) {
            my $Output = $LayoutObject->CustomerHeader(
                Area  => 'Core',
                Title => 'Error'
            );
            $Output .= $LayoutObject->CustomerWarning(
                Message => 'reCAPTCHA entry failed.',
                Comment => 'Please press Back and try again.'
            );
            $Output .= $LayoutObject->CustomerFooter();
            $LayoutObject->Print( Output => \$Output );
            exit 0;
        }
        #end recaptcha

Now i can see Login forms (not a 500 error 100% uptime! Yeah!). Even can check the @Checkbox@ of reCAPTCHA (but then nothing happens...). But then again i get 500 error. Apache says that response is required (so, i guess it's empty?). If I comment my $response line Apache syas that it must be defined. So i guess the whole problem in this line syntax. Or not. It's time to learn rerl, i suppose.