GoogleScholarPlugin.inc.php

<?php
 
import('lib.pkp.classes.plugins.GenericPlugin');
 
class GoogleScholarPlugin extends GenericPlugin {
   function register($category, $path, $mainContextId = null) {
      if (parent::register($category, $path, $mainContextId)) {
         if ($this->getEnabled($mainContextId)) {
            HookRegistry::register('CatalogBookHandler::view', array($this, 'monographFileView'));
         }
         return true;
      }
      return false;
   }
 
   function getContextSpecificPluginSettingsFile() {
      return $this->getPluginPath() . '/settings.xml';
   }
 
   function monographFileView($hookName, $args) {
      $monograph =& $args[1];
      $publication = $monograph->getCurrentPublication();
      $publicationFormat =& $args[2];
      $submissionFile =& $args[3];
 
      if ($submissionFile->getFileType() == 'application/pdf') {
         $request = Application::get()->getRequest();
         $templateMgr = TemplateManager::getManager($request);
         $press = $request->getContext();
         $chapter = $templateMgr->getTemplateVars('chapter');
         $series = $templateMgr->getTemplateVars('series');
 
         $templateMgr->addHeader('googleScholarRevision', '<meta name="gs_meta_revision" content="1.1"/>');
         $templateMgr->addHeader('googleScholarPressTitle', '<meta name="citation_journal_title" content="' . htmlspecialchars($press->getName($press->getPrimaryLocale())) . '"/>');
         if ($series && $issn = $series->getOnlineISSN()) {
            $templateMgr->addHeader('googleScholarIssn', '<meta name="citation_issn" content="' . htmlspecialchars($issn) . '"/> ');
         }
 
         $identificationCodes = $publicationFormat->getIdentificationCodes();
         while ($identificationCode = $identificationCodes->next()) {
            if ($identificationCode->getCode() == "02" || $identificationCode->getCode() == "15") {
               // 02 and 15: ONIX codes for ISBN-10 or ISBN-13
               $templateMgr->addHeader('googleScholarIsbn' . $identificationCode->getCode(), '<meta name="citation_isbn" content="' . htmlspecialchars($identificationCode->getValue()) . '"/>');
            }
         }
 
         foreach ($chapter?$chapter->getAuthors()->toArray():$publication->getData('authors') as $i => $author) {
            $templateMgr->addHeader('googleScholarAuthor' . $i, '<meta name="citation_author" content="' . htmlspecialchars($author->getFullName(false)) . '"/>');
            if ($affiliation = htmlspecialchars($author->getAffiliation($publication->getData('locale')))) {
               $templateMgr->addHeader('googleScholarAuthor' . $i . 'Affiliation', '<meta name="citation_author_institution" content="' . $affiliation . '"/>');
            }
         }
 
         if ($chapter) {
            $templateMgr->addHeader('googleScholarTitle', '<meta name="citation_title" content="' . htmlspecialchars($chapter->getTitle($publication->getData('locale'))) . '"/>');
         } else {
            $templateMgr->addHeader('googleScholarTitle', '<meta name="citation_title" content="' . htmlspecialchars($publication->getData('title', $publication->getData('locale'))) . '"/>');
         }
 
         $templateMgr->addHeader('googleScholarDate', '<meta name="citation_publication_date" content="' . strftime('%Y/%m/%d', strtotime($publication->getData('datePublished'))) . '"/>');
 
         foreach((array) $templateMgr->getTemplateVars('pubIdPlugins') as $pubIdPlugin) {
            if ($pubId = $monograph->getStoredPubId($pubIdPlugin->getPubIdType())) {
               $templateMgr->addHeader('googleScholarPubId' . $pubIdPlugin->getPubIdDisplayType(), '<meta name="citation_' . htmlspecialchars(strtolower($pubIdPlugin->getPubIdDisplayType())) . '" content="' . htmlspecialchars($pubId) . '"/>');
            }
         }
 
         if ($languages = $publication->getData('languages')) foreach ($languages as $language) {
            $templateMgr->addHeader('googleScholarLanguage', '<meta name="citation_language" content="' . htmlspecialchars($language) . '"/>');
         }
 
         $i=0;
         $submissionSubjectDao = DAORegistry::getDAO('SubmissionSubjectDAO'); /* @var $submissionSubjectDao SubmissionSubjectDAO */
         $supportedLocales = array_keys(AppLocale::getSupportedFormLocales());
         if ($subjects = $submissionSubjectDao->getSubjects($publication->getId(), $supportedLocales)) foreach ($subjects as $locale => $subjectLocale) {
            foreach ($subjectLocale as $gsKeyword) $templateMgr->addHeader('googleScholarSubject' . $i++, '<meta name="citation_keywords" xml:lang="' . htmlspecialchars(substr($locale, 0, 2)) . '" content="' . htmlspecialchars($gsKeyword) . '"/>');
         }
 
         $i=0;
         $submissionKeywordDao = DAORegistry::getDAO('SubmissionKeywordDAO'); /* @var $submissionKeywordDao SubmissionKeywordDAO */
         if ($keywords = $submissionKeywordDao->getKeywords($publication->getId(), $supportedLocales)) foreach ($keywords as $locale => $keywordLocale) {
            foreach ($keywordLocale as $gsKeyword) $templateMgr->addHeader('googleScholarKeyword' . $i++, '<meta name="citation_keywords" xml:lang="' . htmlspecialchars(substr($locale, 0, 2)) . '" content="' . htmlspecialchars($gsKeyword) . '"/>');
         }
 
         $templateMgr->addHeader('googleScholarPdfUrl' . $i++, '<meta name="citation_pdf_url" content="' . $request->url(null, 'catalog', 'download', array($monograph->getBestId(), $publicationFormat->getId(), $submissionFile->getFileIdAndRevision())) . '"/>');
      }
 
      return false;
   }
 
   function getDisplayName() {
      return __('plugins.generic.googleScholar.name');
   }
 
   function getDescription() {
      return __('plugins.generic.googleScholar.description');
   }
}