File Coverage

File:C4/External/Amazon.pm
Coverage:38.0%

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1package C4::External::Amazon;
2# Copyright (C) 2006 LibLime
3# <jmf at liblime dot com>
4#
5# This file is part of Koha.
6#
7# Koha is free software; you can redistribute it and/or modify it under the
8# terms of the GNU General Public License as published by the Free Software
9# Foundation; either version 2 of the License, or (at your option) any later
10# version.
11#
12# Koha is distributed in the hope that it will be useful, but WITHOUT ANY
13# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
14# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
15#
16# You should have received a copy of the GNU General Public License along
17# with Koha; if not, write to the Free Software Foundation, Inc.,
18# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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use XML::Simple;
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use LWP::Simple;
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use LWP::UserAgent;
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use HTTP::Request::Common;
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use C4::Koha;
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use URI::Escape;
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use POSIX;
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use Digest::SHA qw(hmac_sha256_base64);
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use strict;
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use warnings;
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use vars qw($VERSION @ISA @EXPORT);
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34BEGIN {
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    require Exporter;
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    $VERSION = 0.03;
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    @ISA = qw(Exporter);
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    @EXPORT = qw(
39        get_amazon_details
40        get_amazon_tld
41    );
42}
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44
45sub get_amazon_tld {
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    my %tld = (
47        CA => '.ca',
48        DE => '.de',
49        FR => '.fr',
50        JP => '.jp',
51        UK => '.co.uk',
52        US => '.com',
53    );
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    my $locale = C4::Context->preference('AmazonLocale');
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    my $tld = $tld{ $locale } || '.com'; # default top level domain is .com
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    return $tld;
58}
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=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
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110sub get_amazon_details {
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    my ( $isbn, $record, $marcflavour, $aws_ref ) = @_;
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    return unless defined $aws_ref;
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    my @aws = @$aws_ref;
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    return if $#aws == -1;
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117    # Normalize the fields
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    $isbn = GetNormalizedISBN($isbn);
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    my $upc = GetNormalizedUPC($record,$marcflavour);
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    my $ean = GetNormalizedEAN($record,$marcflavour);
121    # warn "ISBN: $isbn | UPC: $upc | EAN: $ean";
122
123    # Choose the appropriate and available item identifier
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    my ( $id_type, $item_id ) =
125        defined($isbn) && length($isbn) == 13 ? ( 'EAN', $isbn ) :
126        $isbn ? ( 'ASIN', $isbn ) :
127        $upc ? ( 'UPC', $upc ) :
128        $ean ? ( 'EAN', $upc ) : ( undef, undef );
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    return unless defined($id_type);
130
131    # grab the item format to determine Amazon search index
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    my %hformat = ( a => 'Books', g => 'Video', j => 'Music' );
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    my $search_index = $hformat{ substr($record->leader(),6,1) } || 'Books';
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    my $parameters={Service=>"AWSECommerceService" ,
136        "AWSAccessKeyId"=> C4::Context->preference('AWSAccessKeyID') ,
137        "Operation"=>"ItemLookup",
138        "AssociateTag"=> C4::Context->preference('AmazonAssocTag') ,
139        "Version"=>"2009-06-01",
140        "ItemId"=>$item_id,
141        "IdType"=>$id_type,
142        "ResponseGroup"=> join( ',', @aws ),
143        "Timestamp"=>strftime("%Y-%m-%dT%H:%M:%SZ", gmtime)
144    };
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    $$parameters{"SearchIndex"} = $search_index if $id_type ne 'ASIN';
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    my @params;
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    while (my ($key,$value)=each %$parameters){
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        push @params, qq{$key=}.uri_escape($value, "^A-Za-z0-9\-_.~" );
149    }
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    my $url;
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    if (C4::Context->preference('AWSPrivateKey')) {
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        $url = qq{http://webservices.amazon} . get_amazon_tld() .
154               "/onca/xml?" . join("&",sort @params) . qq{&Signature=} . uri_escape(SignRequest(@params),"^A-Za-z0-9\-_.~" );
155    } else {
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        $url = qq{http://webservices.amazon} . get_amazon_tld() . "/onca/xml?" .join("&",sort @params);
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        warn "MUST set AWSPrivateKey syspref after 2009-08-15 in order to access Amazon web services";
158    }
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    my $content = get($url);
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    warn "could not retrieve $url" unless $content;
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    my $xmlsimple = XML::Simple->new();
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    my $response = $xmlsimple->XMLin(
164        $content,
165        forcearray => [ qw(SimilarProduct EditorialReview Review Item) ],
166    ) unless !$content;
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    return $response;
168}
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170sub SignRequest{
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    my @params=@_;
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    my $tld=get_amazon_tld();
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    my $string = qq{GET\nwebservices.amazon$tld\n/onca/xml\n} . join("&",sort @params);
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    return hmac_sha256_base64($string,C4::Context->preference('AWSPrivateKey')) . '=';
175}
176
177sub check_search_inside {
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        my $isbn = shift;
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        my $ua = LWP::UserAgent->new(
180        agent => "Mozilla/4.76 [en] (Win98; U)",
181        keep_alive => 1,
182        env_proxy => 1,
183        );
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        my $available = 1;
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        my $uri = "http://www.amazon.com/gp/reader/$isbn/ref=sib_dp_pt/002-7879865-0184864#reader-link";
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        my $req = HTTP::Request->new(GET => $uri);
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        $req->header (
188                'Accept' => 'image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */*',
189                'Accept-Charset' => 'iso-8859-1,*,utf-8',
190                'Accept-Language' => 'en-US' );
191
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        my $res = $ua->request($req);
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        my $content = $res->content();
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        if ($content =~ m/This book is temporarily unavailable/) {
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            undef $available;
195        }
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        return $available;
197}
198
1991;