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class-humcore-deposit-datacite-api.php
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class-humcore-deposit-datacite-api.php
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<?php
/**
* API to access DataCite.
*
* @package HumCORE
* @subpackage Deposits
*/
/**
* Class using WP_HTTP to access the EZIP API.
*/
class Humcore_Deposit_Datacite_Api {
private $datacite_settings = array();
private $base_url;
private $options = array();
private $datacite_path;
private $datacite_prefix;
public $datacite_proxy;
public $service_status;
public $namespace;
public $temp_dir;
/**
* Initialize DataCite API settings.
*/
public function __construct() {
$humcore_settings = get_option( 'humcore-deposits-humcore-settings' );
$this->service_status = $humcore_settings ? $humcore_settings['service_status'] : '';
if ( defined( 'CORE_HUMCORE_NAMESPACE' ) && ! empty( CORE_HUMCORE_NAMESPACE ) ) {
$this->namespace = CORE_HUMCORE_NAMESPACE;
} else {
$this->namespace = $humcore_settings['namespace'];
}
if ( defined( 'CORE_HUMCORE_TEMP_DIR' ) && ! empty( CORE_HUMCORE_TEMP_DIR ) ) {
$this->temp_dir = CORE_HUMCORE_TEMP_DIR;
} else {
$this->temp_dir = $humcore_settings['tempdir'];
}
$this->datacite_settings = get_option( 'humcore-deposits-datacite-settings' );
if ( defined( 'CORE_DATACITE_PROTOCOL' ) ) {
$this->datacite_settings['protocol'] = CORE_DATACITE_PROTOCOL;
}
if ( defined( 'CORE_DATACITE_HOST' ) ) {
$this->datacite_settings['host'] = CORE_DATACITE_HOST;
}
if ( defined( 'CORE_DATACITE_PORT' ) ) {
$this->datacite_settings['port'] = CORE_DATACITE_PORT;
}
if ( defined( 'CORE_DATACITE_PATH' ) ) {
$this->datacite_settings['path'] = CORE_DATACITE_PATH;
}
if ( defined( 'CORE_DATACITE_LOGIN' ) ) {
$this->datacite_settings['login'] = CORE_DATACITE_LOGIN;
}
if ( defined( 'CORE_DATACITE_PASSWORD' ) ) {
$this->datacite_settings['password'] = CORE_DATACITE_PASSWORD;
}
if ( defined( 'CORE_DATACITE_PROXY' ) ) {
$this->datacite_settings['proxy'] = CORE_DATACITE_PROXY;
}
if ( defined( 'CORE_DATACITE_PREFIX' ) ) {
$this->datacite_settings['prefix'] = CORE_DATACITE_PREFIX;
}
if ( ! empty( $this->datacite_settings['port'] ) ) {
$this->base_url = $this->datacite_settings['protocol'] . $this->datacite_settings['host'] . ':' . $this->datacite_settings['port'];
} else {
$this->base_url = $this->datacite_settings['protocol'] . $this->datacite_settings['host'];
}
$this->datacite_path = $this->datacite_settings['path'];
$this->datacite_proxy = $this->datacite_settings['proxy'];
$this->datacite_prefix = $this->datacite_settings['prefix'];
$this->options['api-auth']['headers']['Authorization'] = 'Basic ' . base64_encode( $this->datacite_settings['login'] . ':' . $this->datacite_settings['password'] );
$this->options['api-auth']['timeout'] = '10';
$this->options['api-auth']['httpversion'] = '1.1';
$this->options['api-auth']['sslverify'] = true;
$this->options['api']['httpversion'] = '1.1';
$this->options['api']['sslverify'] = true;
}
/**
* Get an identifier.
*
* @param array $args Array of arguments. Supports only the doi argument.
* @link http://datacite.cdlib.org/doc/apidoc.html#operation-get-identifier-metadata
* @return WP_Error|array identifier metadata
* @see wp_parse_args()
* @see wp_remote_request()
*/
public function get_identifier( $args ) {
$defaults = array(
'doi' => '',
);
$params = wp_parse_args( $args, $defaults );
$doi = $params['doi'];
if ( empty( $doi ) ) {
return new WP_Error( 'missingArg', 'DOI is missing.' );
}
$url = sprintf( '%1$s/dois/%2$s', $this->base_url, $doi );
$request_args = $this->options['api-auth'];
$request_args['method'] = 'GET';
$request_args['headers']['Accept'] = 'application/vnd.api+json';
$response = wp_remote_request( $url, $request_args );
if ( is_wp_error( $response ) ) {
return new WP_Error( $response->get_error_code(), $response->get_error_message(), $response->get_error_data( $response->get_error_code() ) );
}
$response_code = wp_remote_retrieve_response_code( $response );
$response_message = wp_remote_retrieve_response_message( $response );
$response_body = wp_remote_retrieve_body( $response );
if ( 200 != $response_code ) {
return new WP_Error( $response_code, $response_message, $response_body );
}
$datacite_metadata = $response_body;
return $datacite_metadata;
}
/**
* Create an identifier.
*
* @param array $args Array of arguments. Supports all arguments from apidoc.html#operation-create-identifier.
* @link http://datacite.cdlib.org/doc/apidoc.html#operation-create-identifier
* @return WP_Error|string body of the Response object
* @see wp_parse_args()
* @see wp_remote_request()
*/
public function create_identifier( array $args = array() ) {
$defaults = array(
'url' => '',
'json' => '',
);
$params = wp_parse_args( $args, $defaults );
if ( empty( $params['json'] ) ) {
return new WP_Error( 'missingArg', 'Metadata is missing.' );
}
$url = sprintf( '%1$s/dois/', $this->base_url );
$content = $params['json'];
//temporary override
//$content = '{"data":{"type":"dois","attributes":{"state":"draft","prefix":"' . $this->datacite_prefix . '","url":"' . $params['url'] . '"}}}';
$request_args = $this->options['api-auth'];
$request_args['method'] = 'POST';
$request_args['headers']['Content-Type'] = 'application/vnd.api+json';
$request_args['body'] = $content;
humcore_write_error_log( 'info', 'URL ', array( 'url' => $url ) );
humcore_write_error_log( 'info', 'Request Args ', array( 'request_args' => $request_args ) );
humcore_write_error_log( 'info', 'JSON ', array( 'JSON' => $params['json'] ) );
$response = wp_remote_request( $url, $request_args );
humcore_write_error_log( 'info', 'Response ', array( 'response' => $response ) );
if ( is_wp_error( $response ) ) {
return new WP_Error( $response->get_error_code(), $response->get_error_message(), $response->get_error_data( $response->get_error_code() ) );
}
$response_code = wp_remote_retrieve_response_code( $response );
$response_message = wp_remote_retrieve_response_message( $response );
$response_body = wp_remote_retrieve_body( $response );
if ( 201 != $response_code ) {
return new WP_Error( $response_code, $response_message, $response_body );
}
humcore_write_error_log( 'info', 'Create DOI ', array( 'response' => $response_body ) );
$doi_response = $response_body;
return $doi_response;
}
/**
* Create a draft identifier.
*
* @param array $args Array of arguments. no args necessary to create a draft doi.
* @link https://support.datacite.org/docs/api-create-dois
* @return WP_Error|string body of the Response object
* @see wp_remote_request()
*/
public function reserve_identifier( array $args = array() ) {
// bypass this function if host = 'none'
if ( 'none' === $this->datacite_settings['host'] ) {
return trim( $this->datacite_settings['host'] );
}
$url = sprintf( '%1$s/dois/', $this->base_url );
$content = '{"data":{"type":"dois","attributes":{"state":"draft","prefix":"' . $this->datacite_prefix . '"}}}';
$request_args = $this->options['api-auth'];
$request_args['method'] = 'POST';
$request_args['headers']['Content-Type'] = 'application/vnd.api+json';
$request_args['body'] = $content;
humcore_write_error_log( 'info', 'URL ', array( 'url' => $url ) );
humcore_write_error_log( 'info', 'Request Args ', array( 'request_args' => $request_args ) );
$response = wp_remote_request( $url, $request_args );
humcore_write_error_log( 'info', 'Response ', array( 'response' => $response ) );
if ( is_wp_error( $response ) ) {
return new WP_Error( $response->get_error_code(), $response->get_error_message(), $response->get_error_data( $response->get_error_code() ) );
}
$response_code = wp_remote_retrieve_response_code( $response );
$response_message = wp_remote_retrieve_response_message( $response );
$response_body = wp_remote_retrieve_body( $response );
if ( 201 != $response_code ) {
return new WP_Error( $response_code, $response_message, $response_body );
}
humcore_write_error_log( 'info', 'Reserve DOI ', array( 'response' => $response_body ) );
$doi_response = $response_body;
return $doi_response;
}
/**
* Modify an identifier.
*
* @param array $args Array of arguments. Supports all arguments from apidoc.html#operation-modify-identifier.
* @link http://datacite.cdlib.org/doc/apidoc.html#operation-modify-identifier
* @return WP_Error|string body of the Response object
* @see wp_parse_args()
* @see wp_remote_request()
*/
public function modify_identifier( array $args = array() ) {
$defaults = array(
'doi' => '',
'event' => '',
'json' => '',
);
$params = wp_parse_args( $args, $defaults );
$doi = $params['doi'];
unset( $params['doi'] ); // Leave out of the body.
if ( empty( $doi ) ) {
return new WP_Error( 'missingArg', 'DOI is missing.' );
}
if ( empty( $params['event'] ) && empty( $params['json'] ) ) {
return new WP_Error( 'missingArg', 'Metadata is missing.' );
}
$url = sprintf( '%1$s/dois/%2$s', $this->base_url, $doi );
if ( ! empty( $params['event'] ) ) {
$content = '{"data":{"type":"dois","attributes":{"event":"' . $params['event'] . '"}}}';
} else if ( ! empty( $params['json'] ) ) {
$content = $params['json'];
}
$request_args = $this->options['api-auth'];
$request_args['method'] = 'PUT';
$request_args['headers']['Content-Type'] = 'application/vnd.api+json';
$request_args['body'] = $content;
humcore_write_error_log( 'info', 'URL ', array( 'url' => $url ) );
humcore_write_error_log( 'info', 'Request Args ', array( 'request_args' => $request_args ) );
humcore_write_error_log( 'info', 'State ', array( 'state' => $params['state'] ) );
humcore_write_error_log( 'info', 'JSON ', array( 'json' => $params['json'] ) );
$response = wp_remote_request( $url, $request_args );
humcore_write_error_log( 'info', 'Response ', array( 'response' => $response ) );
if ( is_wp_error( $response ) ) {
return new WP_Error( $response->get_error_code(), $response->get_error_message(), $response->get_error_data( $response->get_error_code() ) );
}
$response_code = wp_remote_retrieve_response_code( $response );
$response_message = wp_remote_retrieve_response_message( $response );
$response_body = wp_remote_retrieve_body( $response );
if ( 200 != $response_code ) {
return new WP_Error( $response_code, $response_message, $response_body );
}
$doi_response = $response_body;
return $doi_response;
}
/**
* Delete an identifier.
*
* @param array $args Array of arguments. Supports only doi argument.
* @link http://datacite.cdlib.org/doc/apidoc.html#operation-delete-identifier
* @return WP_Error|string body of the Response object
* @see wp_parse_args()
* @see wp_remote_request()
*/
public function delete_identifier( array $args = array() ) {
$defaults = array(
'doi' => '',
);
$params = wp_parse_args( $args, $defaults );
$doi = $params['doi'];
unset( $params['doi'] ); // Leave out of the body.
if ( empty( $doi ) ) {
return new WP_Error( 'missingArg', 'DOI is missing.' );
}
$url = sprintf( '%1$s/dois/%2$s', $this->base_url, $doi );
$request_args = $this->options['api-auth'];
$request_args['method'] = 'DELETE';
$request_args['headers']['Content-Type'] = 'text/plain';
$response = wp_remote_request( $url, $request_args );
if ( is_wp_error( $response ) ) {
return new WP_Error( $response->get_error_code(), $response->get_error_message(), $response->get_error_data( $response->get_error_code() ) );
}
$response_code = wp_remote_retrieve_response_code( $response );
$response_message = wp_remote_retrieve_response_message( $response );
$response_body = wp_remote_retrieve_body( $response );
if ( 204 != $response_code ) {
return new WP_Error( $response_code, $response_message, $response_body );
}
return $response_body;
}
/**
* Prepare doi metadata json.
*
* @return WP_Error|string body of the Response object
* @see wp_remote_request()
*/
public function prepare_doi_metadata_json( $metadata, $state ) {
/*
$metadata['title'],
$metadata['pid'],
$metadata['authors'],
$metadata['type_of_resource'],
$metadata['date_issued'],
$metadata['publisher'],
$metadata['subject'],
$metadata['abstract'],
$metadata['genre'],
$metadata['language'],
$metadata['license']
*/
$resource_type_map = array();
$resource_type_map['Audio'] = 'Sound';
$resource_type_map['Image'] = 'Image';
$resource_type_map['Mixed material'] = 'Other';
$resource_type_map['Software'] = 'Software';
$resource_type_map['Text'] = 'Text';
$resource_type_map['Video'] = 'Audiovisual';
$license_link_list = array();
$license_link_list['Attribution'] = 'https://creativecommons.org/licenses/by/4.0/';
$license_link_list['All Rights Reserved'] = '';
$license_link_list['Attribution-NonCommercial'] = 'https://creativecommons.org/licenses/by-nc/4.0/';
$license_link_list['Attribution-ShareAlike'] = 'https://creativecommons.org/licenses/by-sa/4.0/';
$license_link_list['Attribution-NonCommercial-ShareAlike'] = 'https://creativecommons.org/licenses/by-nc-sa/4.0/';
$license_link_list['Attribution-NoDerivatives'] = 'https://creativecommons.org/licenses/by-nd/4.0/';
$license_link_list['Attribution-NonCommercial-NoDerivatives'] = 'https://creativecommons.org/licenses/by-nc-nd/4.0/';
$license_link_list['All-Rights-Granted'] = 'https://creativecommons.org/publicdomain/zero/1.0/';
$datacite_language_map = array();
$datacite_language_map['Arabic'] = 'ar';
$datacite_language_map['Catalan'] = 'ca';
$datacite_language_map['Chinese'] = 'zh';
$datacite_language_map['Croatian'] = 'hr';
$datacite_language_map['Czech'] = 'cs';
$datacite_language_map['Dutch'] = 'nl';
$datacite_language_map['Egyptian Arabic'] = 'ar';
$datacite_language_map['English'] = 'en';
$datacite_language_map['Filipino'] = 'fl';
$datacite_language_map['Finnish'] = 'fi';
$datacite_language_map['Frenc'] = 'fr';
$datacite_language_map['German'] = 'de';
$datacite_language_map['Greek'] = 'el';
$datacite_language_map['Hebrew'] = 'he';
$datacite_language_map['Hindi'] = 'hi';
$datacite_language_map['Hungarian'] = 'hu';
$datacite_language_map['Indonesian'] = 'id';
$datacite_language_map['Iranian Persian'] = 'fa';
$datacite_language_map['Irish'] = 'ga';
$datacite_language_map['Italian'] = 'it';
$datacite_language_map['Japanese'] = 'ja';
$datacite_language_map['Korean'] = 'ko';
$datacite_language_map['Kurdish'] = 'ku';
$datacite_language_map['Lao'] = 'lo';
$datacite_language_map['Mandarin Chinese'] = 'zh';
$datacite_language_map['Norwegian'] = 'no';
$datacite_language_map['Persian'] = 'fa';
$datacite_language_map['Polish'] = 'pl';
$datacite_language_map['Portuguese'] = 'pt';
$datacite_language_map['Romanian'] = 'ro';
$datacite_language_map['Russian'] = 'ru';
$datacite_language_map['Serbian'] = 'sr';
$datacite_language_map['Spanish'] = 'es';
$datacite_language_map['Swahili'] = 'sw';
$datacite_language_map['Swedish'] = 'sv';
$datacite_language_map['Tagalog'] = 'tl';
$datacite_language_map['Thai'] = 'th';
$datacite_language_map['Tibetan'] = 'bo';
$datacite_language_map['Turkish'] = 'tr';
$datacite_language_map['Ukrainian'] = 'uk';
$datacite_language_map['Urdu'] = 'ur';
$datacite_language_map['Wolof'] = 'wo';
$datacite_language_map['Yiddish'] = 'yi';
$resource_type_general = $resource_type_map[ $metadata['type_of_resource'] ];
if ( empty( $resource_type_general ) ) {
$resource_type_general = 'Other';
}
$doi_metadata = [];
$doi_metadata['data'] = [
'type' => 'dois',
'attributes' => [
'state' => $state,
'prefix' => $this->datacite_prefix,
'identifiers' => [],
'alternateIdentifiers' => [],
'creators' => [],
'titles' => [],
'publisher' => '',
'publicationYear' => '',
'dates' => [],
'subjects' => [],
'contributors' => [],
'language' => '',
'types' => [],
'rightsList' => [],
'descriptions' => [],
'url' => ""
]
];
$doi_metadata['data']['attributes']['titles']['title'] = htmlspecialchars( $metadata['title'], ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8', false );
$doi_metadata['data']['attributes']['publisher'] = 'Humanities Commons';
if ( 'yes' === $metadata['embargoed'] ) {
$doi_metadata['data']['attributes']['publicationYear'] = substr( $metadata['embargo_end_date'], 6, 4 );
} else {
$doi_metadata['data']['attributes']['publicationYear'] = $metadata['date_issued'];
}
$doi_metadata['data']['attributes']['dates'][] = array( 'date' => $metadata['record_creation_date'], 'dateType' => 'Created' );
$doi_metadata['data']['attributes']['dates'][] = array( 'date' => $metadata['record_change_date'], 'dateType' => 'Updated' );
$creator_found = false;
if ( ! empty( $metadata['authors'] ) ) {
foreach ( $metadata['authors'] as $creator ) {
if ( in_array( $creator['role'], array( 'creator', 'author' ) ) && ! empty( $creator['fullname'] ) ) {
$creator_found = true;
$doi_creator = [];
if ( empty( $creator['given'] ) ) {
$doi_creator['name'] = htmlspecialchars( $creator['fullname'], ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8', false );
$doi_creator['nameType'] = 'Organizational';
} else {
$doi_creator['name'] = $creator['family'] . ', ' . $creator['given'];
$doi_creator['nameType'] = 'Personal';
}
if ( 'author' === $creator['role'] ) {
if ( ! empty( $creator['given'] ) ) {
$doi_creator['givenName'] = $creator['given'];
}
if ( ! empty( $creator['family'] ) ) {
$doi_creator['familyName'] = $creator['family'];
}
if ( ! empty( $creator['affiliation'] ) ) {
$doi_creator['affiliation'] = htmlspecialchars( $creator['affiliation'], ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8', false );
}
}
}
if ( ! empty( $doi_creator ) ) {
$doi_metadata['data']['attributes']['creators'][] = $doi_creator;
}
}
if ( ! $creator_found ) {
$doi_metadata['data']['attributes']['creators']['name'] = 'HC User';
}
foreach ( $metadata['authors'] as $contributor ) {
if ( in_array( $contributor['role'], array( 'contributor', 'editor', 'translator' ) ) && ! empty( $contributor['fullname'] ) ) {
$doi_contributor = [];
if ( 'editor' === $contributor['role'] ) {
$doi_contributor['contributorType'] = 'Editor';
} else {
$doi_contributor['contributorType'] = 'Other';
}
if ( empty( $contributor['given'] ) ) {
$doi_contributor['name'] = htmlspecialchars( $contributor['fullname'], ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8', false );
$doi_contributor['nameType'] = 'Organizational';
} else {
$doi_contributor['name'] = $contributor['family'] . ', ' . $contributor['given'];
$doi_contributor['nameType'] = 'Personal';
}
if ( in_array( $contributor['role'], array( 'contributor', 'editor', 'translator' ) ) ) {
if ( ! empty( $contributor['given'] ) ) {
$doi_contributor['givenName'] = $contributor['given'];
}
if ( ! empty( $contributor['family'] ) ) {
$doi_contributor['familyName'] = $contributor['family'];
}
if ( ! empty( $contributor['affiliation'] ) ) {
$doi_contributor['affiliation'] = htmlspecialchars( $contributor['affiliation'], ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8', false );
}
}
}
if ( ! empty( $doi_contributor ) ) {
$doi_metadata['data']['attributes']['contributors'][] = $doi_contributor;
}
}
}
if ( ! empty( $metadata['subject'] ) ) {
$next_subject = [];
foreach ( $metadata['subject'] as $subject ) {
[$fast_id, $fast_subject, $fast_facet] = explode(":", $subject);
//$doi_metadata['data']['attributes']['subjects']['subject'] = htmlspecialchars( $subject, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8', false );
if( $fast_subject ) {
// FAST subject
$next_subject['subject'] = htmlspecialchars( $fast_subject, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8', false );
$next_subject['subjectScheme'] = "fast";
$next_subject['schemeURI'] = htmlspecialchars( "http://id.worldcat.org/fast", ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8', false );
$next_subject['valueURI'] = htmlspecialchars( "http://id.worldcat.org/fast/" . $fast_id, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8', false );
$next_subject['xml:lang'] = "en-US";
} else{
// legacy/MLA subject
$next_subject['subject'] = htmlspecialchars( $fast_subject, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8', false );
}
$doi_metadata['data']['attributes']['subjects'][] = $next_subject;
}
}
$doi_metadata['data']['attributes']['types']['resourceType'] = htmlspecialchars( $metadata['genre'], ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8', false );
$doi_metadata['data']['attributes']['types']['resourceTypeGeneral'] = $resource_type_general;
$datacite_language = $datacite_language_map[ $metadata['language'] ];
if ( ! empty( $datacite_language ) ) {
$doi_metadata['data']['attributes']['language'] = $datacite_language;
}
if ( ! empty( $metadata['type_of_license'] ) ) {
$doi_metadata['data']['attributes']['rightsList']['rights'] = $metadata['type_of_license'];
if ( 'All Rights Reserved' !== $metadata['type_of_license'] ) {
$doi_metadata['data']['attributes']['rightsList']['rightsURI'] = htmlspecialchars( $license_link_list[ $metadata['type_of_license'] ], ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8', false );
}
}
$doi_metadata['data']['attributes']['descriptions']['description'] = htmlspecialchars( str_replace( "\n", ' ', $metadata['abstract'] ), ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8', false );
$doi_metadata['data']['attributes']['descriptions']['descriptionType'] = 'Abstract';
$doi_metadata['data']['attributes']['url'] = sprintf( HC_SITE_URL . '/deposits/item/%s/', $metadata['pid'] );
//--------------------
// this is for debugging:
// subject attributes are not all getting set
//
// goes to /srv/www/commons/logs/hcommons_error.loh
//hcommons_write_error_log( 'debug', '(FAST) doi_metadata = ' . var_dump($doi_metadata) );
//hcommons_write_error_log( 'debug', '(FAST) JSON conversion of (doi_metadata) = ' . json_encode($doi_metadata) );
//--------------------
return json_encode( $doi_metadata );
}
/**
* Get the DataCite server status
*
* @link https://support.datacite.org/reference/heartbeat-1
* @return WP_Error|string http status
* @see wp_parse_args()
* @see wp_remote_request()
*/
public function server_status() {
// bypass this function if host == 'none'
if ( 'none' === $this->datacite_settings['host'] ) {
return trim( $this->datacite_settings['host'] );
}
$url = sprintf( '%1$s/heartbeat', $this->base_url );
$request_args = $this->options['api'];
$request_args['method'] = 'GET';
//echo "REQ - ", $url, " - ", var_export( $request_args, true ), "\n";
$response = wp_remote_request( $url, $request_args );
//echo "RES - ", var_export( $response, true ), "\n";
if ( is_wp_error( $response ) ) {
return new WP_Error( $response->get_error_code(), $response->get_error_message(), $response->get_error_data( $response->get_error_code() ) );
}
$response_code = wp_remote_retrieve_response_code( $response );
$response_message = wp_remote_retrieve_response_message( $response );
$response_body = wp_remote_retrieve_body( $response );
if ( 200 != $response_code ) {
return new WP_Error( 'dataciteServerError', 'DataCite server returned status ' . $response_code . '.' );
} else {
return $response_code;
}
}
}