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Amazon.pm
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Amazon.pm
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package C4::External::Amazon;
# Copyright (C) 2006 LibLime
# <jmf at liblime dot com>
#
# This file is part of Koha.
#
# Koha is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# Koha is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with Koha; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
use XML::Simple;
use LWP::Simple;
use LWP::UserAgent;
use HTTP::Request::Common;
use C4::Koha;
use URI::Escape;
use POSIX;
use Digest::SHA qw(hmac_sha256_base64);
use strict;
use warnings;
use vars qw($VERSION @ISA @EXPORT);
BEGIN {
require Exporter;
$VERSION = 0.03;
@ISA = qw(Exporter);
@EXPORT = qw(
get_amazon_details
get_amazon_tld
);
}
sub get_amazon_tld {
my %tld = (
CA => '.ca',
DE => '.de',
FR => '.fr',
JP => '.jp',
UK => '.co.uk',
US => '.com',
);
my $locale = C4::Context->preference('AmazonLocale');
my $tld = $tld{ $locale } || '.com'; # default top level domain is .com
return $tld;
}
=head1 NAME
C4::External::Amazon - Functions for retrieving Amazon.com content in Koha
=head2 FUNCTIONS
This module provides facilities for retrieving Amazon.com content in Koha
=over
=item get_amazon_detail( $isbn, $record, $marcflavour, $services )
Get editorial reviews, customer reviews, and similar products using Amazon Web Services.
Parameters:
=over
=item $isbn
Biblio record isbn
=item $record
Biblio MARC record
=item $marcflavour
MARC flavor, MARC21 or UNIMARC
=item $services
Requested Amazon services: A ref to an array. For example,
[ 'Similarities', 'EditorialReviews', 'Reviews' ].
No other service will be accepted. Services must be spelled exactly.
If no sercice is requested, AWS isn't called.
=back
=item get_amazon_tld()
Get Amazon Top Level Domain depending on Amazon local preference: AmazonLocal.
For example, if AmazonLocal is 'UK', returns '.co.uk'.
=back
=cut
sub get_amazon_details {
my ( $isbn, $record, $marcflavour, $aws_ref ) = @_;
return unless defined $aws_ref;
my @aws = @$aws_ref;
return if $#aws == -1;
# Normalize the fields
$isbn = GetNormalizedISBN($isbn);
my $upc = GetNormalizedUPC($record,$marcflavour);
my $ean = GetNormalizedEAN($record,$marcflavour);
# warn "ISBN: $isbn | UPC: $upc | EAN: $ean";
# Choose the appropriate and available item identifier
my ( $id_type, $item_id ) =
defined($isbn) && length($isbn) == 13 ? ( 'EAN', $isbn ) :
$isbn ? ( 'ASIN', $isbn ) :
$upc ? ( 'UPC', $upc ) :
$ean ? ( 'EAN', $upc ) : ( undef, undef );
return unless defined($id_type);
# grab the item format to determine Amazon search index
my %hformat = ( a => 'Books', g => 'Video', j => 'Music' );
my $search_index = $hformat{ substr($record->leader(),6,1) } || 'Books';
my $parameters={Service=>"AWSECommerceService" ,
"AWSAccessKeyId"=> C4::Context->preference('AWSAccessKeyID') ,
"Operation"=>"ItemLookup",
"AssociateTag"=> C4::Context->preference('AmazonAssocTag') ,
"Version"=>"2009-06-01",
"ItemId"=>$item_id,
"IdType"=>$id_type,
"ResponseGroup"=> join( ',', @aws ),
"Timestamp"=>strftime("%Y-%m-%dT%H:%M:%SZ", gmtime)
};
$$parameters{"SearchIndex"} = $search_index if $id_type ne 'ASIN';
my @params;
while (my ($key,$value)=each %$parameters){
push @params, qq{$key=}.uri_escape($value, "^A-Za-z0-9\-_.~" );
}
my $url;
if (C4::Context->preference('AWSPrivateKey')) {
$url = qq{http://webservices.amazon} . get_amazon_tld() .
"/onca/xml?" . join("&",sort @params) . qq{&Signature=} . uri_escape(SignRequest(@params),"^A-Za-z0-9\-_.~" );
} else {
$url = qq{http://webservices.amazon} . get_amazon_tld() . "/onca/xml?" .join("&",sort @params);
warn "MUST set AWSPrivateKey syspref after 2009-08-15 in order to access Amazon web services";
}
my $content = get($url);
warn "could not retrieve $url" unless $content;
my $xmlsimple = XML::Simple->new();
my $response = $xmlsimple->XMLin(
$content,
forcearray => [ qw(SimilarProduct EditorialReview Review Item) ],
) unless !$content;
return $response;
}
sub SignRequest{
my @params=@_;
my $tld=get_amazon_tld();
my $string = qq{GET\nwebservices.amazon$tld\n/onca/xml\n} . join("&",sort @params);
return hmac_sha256_base64($string,C4::Context->preference('AWSPrivateKey')) . '=';
}
sub check_search_inside {
my $isbn = shift;
my $ua = LWP::UserAgent->new(
agent => "Mozilla/4.76 [en] (Win98; U)",
keep_alive => 1,
env_proxy => 1,
);
my $available = 1;
my $uri = "http://www.amazon.com/gp/reader/$isbn/ref=sib_dp_pt/002-7879865-0184864#reader-link";
my $req = HTTP::Request->new(GET => $uri);
$req->header (
'Accept' => 'image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */*',
'Accept-Charset' => 'iso-8859-1,*,utf-8',
'Accept-Language' => 'en-US' );
my $res = $ua->request($req);
my $content = $res->content();
if ($content =~ m/This book is temporarily unavailable/) {
undef $available;
}
return $available;
}
1;
__END__
=head1 NOTES
=cut
=head1 AUTHOR
Joshua Ferraro <jmf@liblime.com>
=cut