141 lines
4.6 KiB
PHP
141 lines
4.6 KiB
PHP
<?php
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/**
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* Simple OAI-PMH 2.0 Data Provider
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* Copyright (C) 2005 Heinrich Stamerjohanns <stamer@uni-oldenburg.de>
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* Copyright (C) 2011 Jianfeng Li <jianfeng.li@adelaide.edu.au>
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* Copyright (C) 2013 Daniel Neis Araujo <danielneis@gmail.com>
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* Copyright (C) 2017 Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it 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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* 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, see <http://www.gnu.org/licenses/>.
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*/
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require_once('oai2config.php');
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require_once('oai2server.php');
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// Get all available records and their respective status and timestamps
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$records = array();
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$deleted = array();
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$timestamps = array();
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$earliest = time();
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foreach($config['metadataFormats'] as $prefix => $uris) {
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$files = glob(rtrim($config['dataDirectory'], '/').'/'.$prefix.'/*.xml');
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foreach($files as $file) {
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$records[$prefix][pathinfo($file, PATHINFO_FILENAME)] = $file;
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$deleted[$prefix][pathinfo($file, PATHINFO_FILENAME)] = !filesize($file);
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$timestamps[$prefix][filemtime($file)][] = pathinfo($file, PATHINFO_FILENAME);
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if (filemtime($file) < $earliest) {
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$earliest = filemtime($file);
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}
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}
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ksort($records[$prefix]);
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reset($records[$prefix]);
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ksort($timestamps[$prefix]);
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reset($timestamps[$prefix]);
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}
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// Get current base URL
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$baseURL = $_SERVER['HTTP_HOST'].parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);
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if (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') {
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$baseURL = 'https://'.$baseURL;
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} else {
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$baseURL = 'http://'.$baseURL;
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}
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// Build the Identify response
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$identifyResponse = array(
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'repositoryName' => $config['repositoryName'],
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'baseURL' => $baseURL,
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'protocolVersion' => '2.0',
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'adminEmail' => $config['adminEmail'],
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'earliestDatestamp' => gmdate('Y-m-d\TH:i:s\Z', $earliest),
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'deletedRecord' => $config['deletedRecord'],
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'granularity' => 'YYYY-MM-DDThh:mm:ssZ'
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);
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$oai2 = new OAI2Server(
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$baseURL,
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$_GET,
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$identifyResponse,
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array(
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'GetRecord' =>
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function($identifier, $metadataPrefix) {
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global $records, $deleted;
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if (empty($records[$metadataPrefix][$identifier])) {
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return array();
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} else {
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return array(
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'identifier' => $identifier,
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'timestamp' => filemtime($records[$metadataPrefix][$identifier]),
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'deleted' => $deleted[$metadataPrefix][$identifier],
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'metadata' => $records[$metadataPrefix][$identifier]
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);
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}
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},
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'ListRecords' =>
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function($metadataPrefix, $from = null, $until = null, $count = false, $deliveredRecords = 0, $maxItems = 100) {
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global $records, $deleted, $timestamps;
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$resultSet = array();
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foreach($timestamps[$metadataPrefix] as $timestamp => $identifiers) {
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if ((is_null($from) || $timestamp >= $from) && (is_null($until) || $timestamp <= $until)) {
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foreach($identifiers as $identifier) {
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$resultSet[] = array(
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'identifier' => $identifier,
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'timestamp' => filemtime($records[$metadataPrefix][$identifier]),
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'deleted' => $deleted[$metadataPrefix][$identifier],
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'metadata' => $records[$metadataPrefix][$identifier]
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);
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}
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}
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}
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if ($count) {
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return count($resultSet);
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} else {
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return array_slice($resultSet, $deliveredRecords, $maxItems);
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}
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},
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'ListMetadataFormats' =>
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function($identifier = '') {
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global $config, $records;
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if (!empty($identifier)) {
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$formats = array();
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foreach($records as $format => $record) {
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if (!empty($record[$identifier])) {
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$formats[$format] = $config['metadataFormats'][$format];
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}
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}
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if (!empty($formats)) {
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return $formats;
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} else {
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throw new OAI2Exception('idDoesNotExist');
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}
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} else {
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return $config['metadataFormats'];
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}
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}
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),
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$config
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);
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$response = $oai2->response();
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if (isset($return)) {
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return $response;
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} else {
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$response->formatOutput = true;
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$response->preserveWhiteSpace = false;
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header('Content-Type: text/xml');
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echo $response->saveXML();
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}
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