70 lines
2.4 KiB
PHP
70 lines
2.4 KiB
PHP
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<?php
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/**
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; under version 2
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* of the License (non-upgradable).
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*
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* This program is distributed in the hope that it will be useful,
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* but 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 this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright (c) 2017 (original work) Open Assessment Technologies SA (under the project TAO-PRODUCT);
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*
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*
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*/
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namespace oat\taoLti\models\classes\ResourceLink;
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use oat\oatbox\service\ConfigurableService;
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use oat\generis\model\OntologyAwareTrait;
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/**
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* Service to generate unique ids for consumers resource links
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* using the generis ontology
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*
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* @author joel bout (joel@taotesting.com)
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*/
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class OntologyLink extends ConfigurableService implements LinkService
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{
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use OntologyAwareTrait;
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const CLASS_LTI_INCOMINGLINK = 'http://www.tao.lu/Ontologies/TAOLTI.rdf#LtiIncomingLink';
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const PROPERTY_LINK_ID = 'http://www.tao.lu/Ontologies/TAOLTI.rdf#LTILinkId';
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const PROPERTY_CONSUMER = 'http://www.tao.lu/Ontologies/TAOLTI.rdf#LTILinkConsumer';
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const PROPERTY_LAUNCH_URL = 'http://www.tao.lu/Ontologies/TAOLTI.rdf#ResourceLinkLaunchUrl';
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public function getLinkId($consumerId, $resourceLink): string
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{
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$class = $this->getClass(self::CLASS_LTI_INCOMINGLINK);
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// search for existing resource
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$instances = $class->searchInstances([
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self::PROPERTY_LINK_ID => $resourceLink,
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self::PROPERTY_CONSUMER => $consumerId
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], ['like' => false,'recursive' => false]);
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if (count($instances) > 1) {
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throw new \common_exception_Error('Multiple resources for link ' . $resourceLink);
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}
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if (count($instances) == 1) {
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// use existing link
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$ltiLink = current($instances);
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} else {
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// spawn new link
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$ltiLink = $class->createInstanceWithProperties([
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self::PROPERTY_LINK_ID => $resourceLink,
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self::PROPERTY_CONSUMER => $consumerId
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]);
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}
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return $ltiLink->getUri();
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}
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}
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