File Coverage

blib/lib/Business/PayPal.pm

Criterion	Covered	Total	%
statement	73	85	85.8
branch	25	52	48.0
condition			n/a
subroutine	11	11	100.0
pod	5	6	83.3
total	114	154	74.0

package Business::PayPal;

use 5.6.1;
use strict;
use warnings;

our $VERSION = '0.19';

use Net::SSLeay 1.14;
use Digest::MD5 qw(md5_hex);

our $Cert;
our $Certcontent;

my @certificates;
# added to 0.12 on 2014.04.19
push @certificates, <<'CERT';
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
CERT

# added to 0.14 on 2015.04.01
push @certificates, <<'CERT';
-----BEGIN CERTIFICATE-----
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n64=
-----END CERTIFICATE-----
CERT

push @certificates, <<'CERT';
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
CERT

# added to 0.17 on 2015.10.02
push @certificates, <<'CERT';
-----BEGIN CERTIFICATE-----
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nA==
-----END CERTIFICATE-----
CERT

# added to 0.18 on 2016.08.02
push @certificates, <<'CERT';
-----BEGIN CERTIFICATE-----
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DGMucGF5cGFsLmNvbYINYzYucGF5cGFsLmNvbYIUZGV2ZWxvcGVyLnBheXBhbC5j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-----END CERTIFICATE-----
CERT

# added to 0.19 on 2020.03.07
push @certificates, <<'CERT';
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
CERT

# NEXT @certificates comes here
# added to 0.17 on 2015.10.02
# push @certificates, <<'CERT';
# CERT

chomp(@certificates);

my @cert_contents;
push @cert_contents, <<'CERTCONTENT';
Subject Name: /1.3.6.1.4.1.311.60.2.1.3=US/1.3.6.1.4.1.311.60.2.1.2=Delaware/businessCategory=Private Organization/serialNumber=3014267/C=US/postalCode=95131-2021/ST=California/L=San Jose/street=2211 N 1st St/O=PayPal, Inc./OU=CDN Support/CN=www.paypal.com
Issuer  Name: /C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=Terms of use at https://www.verisign.com/rpa (c)06/CN=VeriSign Class 3 Extended Validation SSL CA
CERTCONTENT

push @cert_contents, <<'CERTCONTENT';
Subject Name: /1.3.6.1.4.1.311.60.2.1.3=US/1.3.6.1.4.1.311.60.2.1.2=Delaware/businessCategory=Private Organization/serialNumber=3014267/C=US/postalCode=95131-2021/ST=California/L=San Jose/street=2211 N 1st St/O=PayPal, Inc./OU=CDN Support/CN=www.paypal.com
Issuer  Name: /C=US/O=Symantec Corporation/OU=Symantec Trust Network/CN=Symantec Class 3 EV SSL CA - G2
CERTCONTENT

# added to 0.17 on 2015.10.02
push @cert_contents, <<'CERTCONTENT';
Subject Name: /1.3.6.1.4.1.311.60.2.1.3=US/1.3.6.1.4.1.311.60.2.1.2=Delaware/businessCategory=Private Organization/serialNumber=3014267/C=US/postalCode=95131-2021/ST=California/L=San Jose/street=2211 N 1st St/O=PayPal, Inc./OU=CDN Support/CN=www.paypal.com
Issuer  Name: /C=US/O=Symantec Corporation/OU=Symantec Trust Network/CN=Symantec Class 3 EV SSL CA - G3
CERTCONTENT

# added to 0.19 on 2020.03.07
push @cert_contents, <<'CERTCONTENT';
Subject Name: /businessCategory=Private Organization/jurisdictionC=US/jurisdictionST=Delaware/serialNumber=3014267/C=US/ST=California/L=San Jose/O=PayPal, Inc./OU=CDN Support/CN=www.paypal.com
Issuer  Name: /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert SHA2 Extended Validation Server CA
CERTCONTENT

chomp(@cert_contents);

# creates new PayPal object.  Assigns an id if none is provided.
sub new {
    my $class = shift;

    my $self = {
        id => undef,
        address => 'https://www.paypal.com/cgi-bin/webscr',
        check_cert => 1,
        @_,
    };
    bless $self, $class;
    $self->{id} = md5_hex(rand()) unless $self->{id};

    return $self;
}

sub check_cert {
    my ($self, $value) = @_;
    $self->{check_cert} = $value;
    return;
}

# returns current PayPal id
sub id {
    my ($self) = @_;

    return $self->{id};
}

#creates a PayPal button
sub button {
    my $self = shift;

    my %buttonparam = (
        cmd                 => '_ext-enter',
        redirect_cmd        => '_xclick',
        button_image        => qq{},
        business            => undef,
        item_name           => undef,
        item_number         => undef,
        image_url           => undef,
        no_shipping         => 1,
        return              => undef,
        cancel_return       => undef,
        no_note             => 1,
        undefined_quantity  => 0,
        notify_url          => undef,
        first_name          => undef,
        last_name           => undef,
        shipping            => undef,
        shipping2           => undef,
        quantity            => undef,
        amount              => undef,
        address1            => undef,
        address2            => undef,
        city                => undef,
        state               => undef,
        zip                 => undef,
        night_phone_a       => undef,
        night_phone_b       => undef,
        night_phone_c       => undef,
        day_phone_a         => undef,
        day_phone_b         => undef,
        day_phone_c         => undef,
        receiver_email      => undef,
        invoice             => undef,
        currency_code       => undef,
        custom              => $self->{id},
        @_,
    );
    my $key;
    my $form_id = '';
    if (defined $buttonparam{form_id}) {
        $form_id = qq{id="$buttonparam{form_id}"};
        delete $buttonparam{form_id};
    }
    my $content = qq{\n};

    foreach my $param (sort keys %buttonparam) {
        next if not defined $buttonparam{$param};
        next if $param eq 'button_image';
        $content .= qq{\n};
    }
    $content .= "$buttonparam{button_image}\n";
    $content .= qq{\n};

    return $content;
}


# takes a reference to a hash of name value pairs, such as from a CGI query
# object, which should contain all the name value pairs which have been
# posted to the script by PayPal's Instant Payment Notification
# posts that data back to PayPal, checking if the ssl certificate matches,
# and returns success or failure, and the reason.
sub ipnvalidate {
    my ($self, $query) = @_;

    $query->{cmd} = '_notify-validate';
    my $id = $self->{id};
    my ($succ, $reason) = $self->postpaypal($query);

    return (wantarray ? ($id,   $reason) : $id  ) if $succ;
    return (wantarray ? (undef, $reason) : undef);
}

# this method should not normally be used unless you need to test, or if
# you are overriding the behaviour of ipnvalidate.  It takes a reference
# to a hash containing the query, posts to PayPal with the data, and returns
# success or failure, as well as PayPal's response.
sub postpaypal {
    my ($self, $query) = @_;

    my $address = $self->{address};
    my ($site, $port, $path);

    #following code splits an url into site, port and path components
    my @address = split /:\/\//, $address, 2;
    @address = split /(?=\/)/, $address[1], 2;
    if ($address[0] =~ /:/) {
        ($site, $port) = split /:/, $address[0];
    }
    else {
        ($site, $port) = ($address[0], '443');
    }
    $path = $address[1];
    my ($page,
        $response,
        $headers,
        $ppcert,
        ) = Net::SSLeay::post_https3($site,
                                         $port,
                                         $path,
                                         '',
                                         Net::SSLeay::make_form(%$query));

    return (wantarray ? (undef, "No PayPal cert found") : undef)
        unless $ppcert;

    my $ppx509 = Net::SSLeay::PEM_get_string_X509($ppcert);
    my $ppcertcontent =
    'Subject Name: '
        . Net::SSLeay::X509_NAME_oneline(
               Net::SSLeay::X509_get_subject_name($ppcert))
            . "\nIssuer  Name: "
                . Net::SSLeay::X509_NAME_oneline(
                       Net::SSLeay::X509_get_issuer_name($ppcert))
                    . "\n";

    chomp $ppx509;
    chomp $ppcertcontent;

    my @certs = @certificates;
    if ($Cert) {
        # TODO added in 0.12
        warn "The global variable \$Cert is deprecated and will be removed soon. Pass a certificate to the constructor using the 'cert' parameter.\n";
        push @certs, $Cert;
    }
    my @cert_cont = @cert_contents;
    if ($Certcontent) {
        # TODO added in 0.12
        warn "The global variable \$Certcontent is deprecated and will be removed soon. Pass a certificate to the constructor using the 'certcontent' parameter.\n";
        push @cert_cont, $Certcontent;
    }

    if ($self->{addcert}) {
        push @certs, $self->{cert};
    }
    if ($self->{addcertcontent}) {
        push @cert_cont, $self->{certcontent};
    }

    if ($self->{cert}) {
        @certs = $self->{cert};
    }
    if ($self->{certcontent}) {
        @cert_cont = $self->{certcontent};
    }

    if ($self->{check_cert}) {
        return (wantarray ? (undef, "PayPal cert failed to match:\n$ppx509") : undef)
            unless grep {$_ eq $ppx509} @certs;
        return (wantarray ? (undef, "PayPal cert contents failed to match:\n$ppcertcontent") : undef)
        unless grep { $_ eq $ppcertcontent } @cert_cont;
    }
    return (wantarray ? (undef, 'PayPal says transaction INVALID') : undef)
        if $page eq 'INVALID';
    return (wantarray ? (1, 'PayPal says transaction VERIFIED') : 1)
        if $page eq 'VERIFIED';
    warn "Bad stuff happened\n$page";
    return (wantarray ? (undef, "Bad stuff happened") :undef);
}



1;

=head1 NAME

Business::PayPal - Perl extension for automating PayPal transactions

=head1 ABSTRACT

Business::PayPal makes the automation of PayPal transactions as simple
as doing credit card transactions through a regular processor.  It includes
methods for creating PayPal buttons and for validating the Instant Payment
Notification that is sent when PayPal processes a payment.

=head1 SYNOPSIS

To generate a PayPal button for use on your site
Include something like the following in your CGI

  use Business::PayPal;
  my $paypal = Business::PayPal->new;
  my $button = $paypal->button(
      business => '[e-mail]',
      item_name => 'CanSecWest Registration Example',
      return => 'http://www.cansecwest.com/return.cgi',
      cancel_return => 'http://www.cansecwest.com/cancel.cgi',
      amount => '1600.00',
      quantity => 1,
      notify_url => http://www.cansecwest.com/ipn.cgi
  );
  my $id = $paypal->id;

Store $id somewhere so we can get it back again later

Store current context with $id.

Print button to the browser.

Note, button is an HTML form, already enclosed in  tags



To validate the Instant Payment Notification from PayPal for the
button used above include something like the following in your
'notify_url' CGI.

  use CGI;
  my $query = CGI->new;
  my %query = $query->Vars;
  my $id = $query{custom};
  my $paypal = Business::PayPal->new(id => $id);
  my ($txnstatus, $reason) = $paypal->ipnvalidate(\%query);
  die "PayPal failed: $reason" unless $txnstatus;
  my $money = $query{payment_gross};
  my $paystatus = $query{payment_status};

Check if paystatus eq 'Completed'.
Check if $money is the amount you expected.
Save payment status information to store as $id.


To tell the user if their payment succeeded or not, use something like
the following in the CGI pointed to by the 'return' parameter in your
PayPal button.

  use CGI;
  my $query = CGI->new;
  my $id = $query{custom};

  #get payment status from store for $id
  #return payment status to customer

In order to use the sandbox provided by PayPal, you can provide the address of the sandbox
in the constructor:

  my $pp = Business::PayPal->new( address  => 'https://www.sandbox.paypal.com/cgi-bin/webscr' );

=head1 DESCRIPTION

=head2 new()

Creates a new Business::PayPal object, it can take the
following parameters:

=over 2

=item id

The Business::PayPal object id, if not specified a new
id will be created using md5_hex(rand())

=item address

The address of PayPal's payment server, currently:
https://www.paypal.com/cgi-bin/webscr

=item cert

The x509 certificate for I, see source for default.

=item certcontent

The contents of the x509 certificate I, see source for
default.

=item addcert

The x509 certificate for I.
This is added to the default values.

=item addcertcontent

The contents of the x509 certificate I,
This is added to the default values.

=back

=head2 id()

Returns the id for the Business::PayPal object.

=head2 button()

Returns the HTML for a PayPal button.  It takes a large number of
parameters, which control the look and function of the button, some
of which are required and some of which have defaults.  They are
as follows:

=over 2

=item cmd

required, defaults to '_ext-enter'

This allows the user information to be pre-filled in.
You should never need to specify this, as the default should
work fine.

=item redirect_cmd

required, defaults to '_xclick'

This allows the user information to be pre-filled in.
You should never need to specify this, as the default should
work fine.

=item button_image

required, defaults to:

    CGI::image_button(-name => 'submit',
                      -src  => 'http://images.paypal.com/x-click-but01.gif'
                      -alt  => 'Make payments with PayPal',
                     )

You may wish to change this if the button is on an https page
so as to avoid the browser warnings about insecure content on a
secure page.

for example use a Bootstrap style button:

  button_image  => '9 USD per month',

=item form_id

  form_id => 'some_id',

Adding id="some_id" to the form created. Adding and id will make it easier to locate
the form on the page by some JavaScript code.

=item business

required, no default

This is the name of your PayPal account.

=item item_name

This is the name of the item you are selling.

=item item_number

This is a numerical id of the item you are selling.

=item image_url

A URL pointing to a 150 x 50 image which will be displayed
instead of the name of your PayPal account.

=item no_shipping

defaults to 1

If set to 1, does not ask customer for shipping info, if
set to 0 the customer will be prompted for shipping information.

=item return

This is the URL to which the customer will return to after
they have finished paying.

=item cancel_return

This is the URL to which the customer will be sent if they cancel
before paying.

=item no_note

defaults to 1

If set to 1, does not ask customer for a note with the payment,
if set to 0, the customer will be asked to include a note.

=item currency_code

Currency the payment should be taken in, e.g. EUR, GBP.
If not specified payments default to USD.

=item address1

=item undefined_quantity

defaults to 0

If set to 0 the quantity defaults to 1, if set to 1 the user
can edit the quantity.

=item notify_url

The URL to which PayPal Instant Payment Notification is sent.

=item first_name

First name of customer, used to pre-fill PayPal forms.

=item last_name

Last name of customer, used to pre-fill PayPal forms.

=item shipping

I don't know, something to do with shipping, please tell me if
you find out.

=item shipping2

I don't know, something to do with shipping, please tell me if you
find out.

=item quantity

defaults to 1

Number of items being sold.

=item amount

Price of the item being sold.

=item address1

Address of customer, used to pre-fill PayPal forms.

=item address2

Address of customer, used to pre-fill PayPal forms.

=item city

City of customer, used to pre-fill PayPal forms.

=item state

State of customer, used to pre-fill PayPal forms.

=item zip

Zip of customer, used to pre-fill PayPal forms.

=item night_phone_a

Phone

=item night_phone_b

Phone

=item night_phone_c

Phone

=item day_phone_a

Phone

=item day_phone_b

Phone

=item day_phone_c

Phone

=item receiver_email

Email address of customer - I think

=item invoice

Invoice number - I think

=item custom

defaults to the Business::PayPal id

Used by Business::PayPal to track which button is associated
with which Instant Payment Notification.

=back

=head2 ipnvalidate()

Takes a reference to a hash of name value pairs, such as from a
CGI query object, which should contain all the name value pairs
which have been posted to the script by PayPal's Instant Payment
Notification posts that data back to PayPal, checking if the ssl
certificate matches, and returns success or failure, and the
reason.

=head2 postpaypal()

This method should not normally be used unless you need to test,
or if you are overriding the behaviour of ipnvalidate.  It takes a
reference to a hash containing the query, posts to PayPal with
the data, and returns success or failure, as well as PayPal's
response.

=head1 MAINTAINER

Gabor Szabo, L, L

phred, [e-mail]

=head1 AUTHOR

mock, [e-mail]

=head1 SEE ALSO

L, L, L.

Explanation of the fields: L
See also in the pdf here: L


=head1 LICENSE

Copyright (c) 2010, phred [e-mail]. All rights reserved.

Copyright (c) 2002, mock [e-mail].  All rights reserved.

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=cut