237 lines
6.6 KiB
Perl
237 lines
6.6 KiB
Perl
package C4::External::Amazon;
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# Copyright (C) 2006 LibLime
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# <jmf at liblime dot com>
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#
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# This file is part of Koha.
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#
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# Koha is free software; you can redistribute it and/or modify it under the
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# terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# Koha is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along with
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# Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
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# Suite 330, Boston, MA 02111-1307 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($VERSION @ISA @EXPORT);
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BEGIN {
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require Exporter;
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$VERSION = 0.03;
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@ISA = qw(Exporter);
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@EXPORT = qw(
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&get_amazon_details
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&check_search_inside
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&get_amazon_tld
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);
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}
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sub get_amazon_tld {
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my %tld = (
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CA => '.ca',
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DE => '.de',
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FR => '.fr',
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JP => '.jp',
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UK => '.co.uk',
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US => '.com',
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);
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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;
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}
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=head1 NAME
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C4::External::Amazon - Functions for retrieving Amazon.com content in Koha
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=head1 FUNCTIONS
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This module provides facilities for retrieving Amazon.com content in Koha
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=head2 get_amazon_details
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=over 4
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my $amazon_details = &get_amazon_details( $xisbn, $record, $marcflavour );
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=back
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Get editorial reviews, customer reviews, and similar products using Amazon Web Services.
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=cut
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sub get_amazon_details {
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my ( $isbn, $record, $marcflavour ) = @_;
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#normalize the ISBN
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$isbn = _normalize_match_point ($isbn);
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my $upc = _get_amazon_upc($record,$marcflavour);
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my $ean = _get_amazon_ean($record,$marcflavour);
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# warn "ISBN: $isbn | UPC: $upc | EAN: $ean";
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# Choose the appropriate and available item identifier
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my ( $id_type, $item_id ) =
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defined($isbn) && length($isbn) == 13 ? ( 'EAN', $isbn ) :
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$isbn ? ( 'ASIN', $isbn ) :
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$upc ? ( 'UPC', $upc ) :
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$ean ? ( 'EAN', $upc ) : ( undef, undef );
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return unless defined($id_type);
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# 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 $parameters={Service=>"AWSECommerceService" ,
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"AWSAccessKeyId"=> C4::Context->preference('AWSAccessKeyID') ,
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"Operation"=>"ItemLookup",
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"AssociateTag"=> C4::Context->preference('AmazonAssocTag') ,
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"Version"=>"2009-06-01",
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"ItemId"=>$item_id,
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"IdType"=>$id_type,
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"ResponseGroup"=> join( ',', @aws ),
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"Timestamp"=>strftime("%Y-%m-%dT%H:%M:%SZ", gmtime)
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};
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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\-_.~" );
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}
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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() .
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"/onca/xml?" . join("&",sort @params) . qq{&Signature=} . uri_escape(SignRequest(@params),"^A-Za-z0-9\-_.~" );
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} 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";
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}
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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 = $xmlsimple->XMLin(
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$content,
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forcearray => [ qw(SimilarProduct EditorialReview Review Item) ],
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) unless !$content;
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return $response;
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}
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sub 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')) . '=';
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}
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sub check_search_inside {
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my $isbn = shift;
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my $ua = LWP::UserAgent->new(
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agent => "Mozilla/4.76 [en] (Win98; U)",
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keep_alive => 1,
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env_proxy => 1,
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);
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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 (
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'Accept' => 'image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */*',
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'Accept-Charset' => 'iso-8859-1,*,utf-8',
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'Accept-Language' => 'en-US' );
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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;
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}
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return $available;
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}
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sub _get_amazon_upc {
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my ($record,$marcflavour) = @_;
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my (@fields,$upc);
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if ($marcflavour eq 'MARC21') {
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@fields = $record->field('024');
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foreach my $field (@fields) {
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my $indicator = $field->indicator(1);
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my $upc = _normalize_match_point($field->subfield('a'));
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if ($indicator == 1 and $upc ne '') {
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return $upc;
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}
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}
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}
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else { # assume unimarc if not marc21
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@fields = $record->field('072');
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foreach my $field (@fields) {
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my $upc = _normalize_match_point($field->subfield('a'));
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if ($upc ne '') {
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return $upc;
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}
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}
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}
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}
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sub _get_amazon_ean {
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my ($record,$marcflavour) = @_;
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my (@fields,$ean);
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if ($marcflavour eq 'MARC21') {
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@fields = $record->field('024');
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foreach my $field (@fields) {
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my $indicator = $field->indicator(1);
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my $upc = _normalize_match_point($field->subfield('a'));
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if ($indicator == 3 and $upc ne '') {
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return $upc;
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}
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}
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}
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else { # assume unimarc if not marc21
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@fields = $record->field('073');
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foreach my $field (@fields) {
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my $upc = _normalize_match_point($field->subfield('a'));
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if ($upc ne '') {
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return $upc;
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}
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}
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}
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}
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sub _normalize_match_point {
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my $match_point = shift;
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(my $normalized_match_point) = $match_point =~ /([\d-]*[X]*)/;
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$normalized_match_point =~ s/-//g;
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return $normalized_match_point;
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}
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1;
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__END__
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=head1 NOTES
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=head1 AUTHOR
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Joshua Ferraro <jmf@liblime.com>
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=cut
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