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145 lines
3.3 KiB
145 lines
3.3 KiB
package C4::External::OverDrive;
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# Copyright (c) 2013 ByWater
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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
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# Koha is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# 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
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# along with Koha; if not, see <http://www.gnu.org/licenses>.
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use strict;
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use warnings;
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use JSON;
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use Koha::Cache;
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use HTTP::Request;
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use HTTP::Request::Common;
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use LWP::Authen::Basic;
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use LWP::UserAgent;
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BEGIN {
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require Exporter;
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our $VERSION = 3.07.00.049;
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our @ISA = qw( Exporter ) ;
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our @EXPORT = qw(
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IsOverDriveEnabled
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GetOverDriveToken
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);
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}
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sub _request {
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my ( $request ) = @_;
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my $ua = LWP::UserAgent->new( "Koha " . C4::Context->KOHAVERSION );
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my $response;
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eval {
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$response = $ua->request( $request ) ;
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};
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if ( $@ ) {
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warn "OverDrive request failed: $@";
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return;
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}
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return $response;
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}
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=head1 NAME
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C4::External::OverDrive - Retrieve OverDrive content availability information
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=head2 FUNCTIONS
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This module provides content search for OverDrive,
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=over
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=item IsOverDriveEnabled
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Returns 1 if all of the necessary system preferences for OverDrive are set.
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=back
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=cut
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sub IsOverDriveEnabled {
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return (
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C4::Context->preference( 'OverDriveClientKey' ) &&
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C4::Context->preference( 'OverDriveClientSecret' )
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);
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}
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=over
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=item GetOverDriveToken
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Fetches an OAuth2 auth token for the OverDrive API, reusing an existing token in
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Memcache if possible.
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Returns the token ( as "bearer ..." ) or undef on failure.
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=back
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=cut
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sub GetOverDriveToken {
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my $key = C4::Context->preference( 'OverDriveClientKey' );
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my $secret = C4::Context->preference( 'OverDriveClientSecret' );
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return unless ( $key && $secret ) ;
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my $cache;
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eval { $cache = Koha::Cache->get_instance() };
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my $token;
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$cache and $token = $cache->get_from_cache( "overdrive_token" ) and return $token;
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my $request = HTTP::Request::Common::POST( 'https://oauth.overdrive.com/token', [
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grant_type => 'client_credentials'
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] ) ;
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$request->header( Authorization => LWP::Authen::Basic->auth_header( $key, $secret ) );
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my $response = _request( $request ) or return;
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if ( $response->header('Content-Type') !~ m!application/json! ) {
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warn "Could not connect to OverDrive: " . $response->message;
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return;
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}
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my $contents = from_json( $response->decoded_content );
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if ( !$response->is_success ) {
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warn "Could not log into OverDrive: " . ( $contents ? $contents->{'error_description'} : $response->decoded_content );
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return;
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}
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$token = $contents->{'token_type'} . ' ' . $contents->{'access_token'};
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# Fudge factor to prevent spurious failures
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$cache
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and $cache->set_in_cache( 'overdrive_token', $token,
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{ expiry => $contents->{'expires_in'} - 5 } );
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return $token;
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}
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1;
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__END__
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=head1 NOTES
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=cut
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=head1 AUTHOR
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Jesse Weaver <pianohacker@gmail.com>
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=cut
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