86 lines
3.3 KiB
PHP
86 lines
3.3 KiB
PHP
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<?php
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/**
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* http://www.openarchives.org/OAI/2.0/guidelines-harvester.htm
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* 8. Harvesting all the Metadata from a Repository
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*
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* Proxies, aggregators and other such agents may wish to harvest a complete copy of a repository
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* including set structure and all metadata formats. One strategy for doing this would be:
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*
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* # Issue an Identify request to find the finest datestamp granularity supported.
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* # Issue a ListMetadataFormats request to obtain a list of all metadataPrefixes supported.
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* # Harvest using ListRecords requests for each metadataPrefix supported. Knowledge of the
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* datestamp granularity allows for less overlap if granularities finer than a day are supported.
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* # Set structure can be inferred from the setSpec elements in the header blocks of each record
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* returned (consistency checks are possible).
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* # Items may be reconstructed from the constituent records. Local datestamps must be assigned to
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* harvested items.
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* # Provenance and other information in <about> blocks may be re-assembled at the item level if it
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* is the same for all metadata formats harvested. However, this information may be supplied
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* differently for different metadata formats and may thus need to be store separately for each
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* metadata format.
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*/
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class OAI2Client {
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public function __construct($server_base_url) {
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$this->server_base_url = $server_base_url;
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require_once('./curl.php');
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$this->curl = new Curl();
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}
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public function Identify() {
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return $this->curl->get($this->server_base_url.'?verb=Identify');
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}
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public function ListMetadataFormats($identifier = '') {
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$url = $this->server_base_url.'?verb=ListMetadataFormats';
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if (!empty($identifier)) {
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$url .= "&identifier={$identifier}";
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}
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return $this->curl->get($url);
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}
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public function ListSets($resumptionToken = '') {
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$url = $this->server_base_url.'?verb=ListSets';
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return $this->curl->get($url);
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}
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public function ListIdentifiers($options = array()) {
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$options_default = array('from' => null,
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'until' => null,
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'set' => null,
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'resumptionToken' => null,
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'metadataPrefix' => null); // required
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$url = $this->server_base_url.'?verb=ListIdentifiers';
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if (!empty($options['metadataPrefix'])) {
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$url .= "&metadataPrefix={$options['metadataPrefix']}";
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}
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return $this->curl->get($url);
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}
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public function ListRecords($options = array()) {
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$options_default = array('from' => null,
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'until' => null,
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'set' => null,
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'resumptionToken' => null,
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'metadataPrefix' => null); // required
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$url = $this->server_base_url.'?verb=ListRecords';
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if (!empty($options['metadataPrefix'])) {
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$url .= "&metadataPrefix={$options['metadataPrefix']}";
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}
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return $this->curl->get($url);
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}
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public function GetRecord($identifier, $metadataPrefix) {
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$url = $this->server_base_url.'?verb=ListRecords';
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$url .= "&identifier={$identifier}&metadataPrefix={$metadataPrefix}";
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return $this->curl->get($url);
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}
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}
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