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<?php
/* for OJS 3.4:
namespace APP\plugins\generic\rqc;
use PKP\plugins\PluginRegistry;
*/
import('plugins.generic.rqc.RqcPlugin');
import('plugins.generic.rqc.classes.RqcData');
import('plugins.generic.rqc.classes.RqcDevHelper');

define('RQC_MHS_APIKEYCHECK_URL', "%s/api/mhs_apikeycheck/%s");  // host, rqcJournalId
define('RQC_MHS_SUBMISSION_URL', "%s/api/mhs_submission/%s/%s");  // host, rqcJournalId, externalUid

/**
 * Class RqcCall.
 * The technical parts of calls to the RQC server.
 */
class RqcCall {
	static function call_mhs_submission(string $rqcHostUrl, string $rqcJournalId, string $rqcJournalAPIKey,
										$request, $contextId, $submissionId, bool $strict = false): array
	{
		$rqcdata = new RqcData();
		$data = $rqcdata->rqcdata_array($request, $contextId, $submissionId);
		$url = sprintf(RQC_MHS_SUBMISSION_URL, $rqcHostUrl, $rqcJournalId, $submissionId);
		return RqcCall::curlcall($url, $rqcJournalAPIKey, "POST", $data, $strict);
	}

static function call_mhs_apikeycheck(string $hostUrl, string $rqcJournalId, string $rqcJournalAPIKey,
										 bool $strict = false): array
	{
		$url = sprintf(RQC_MHS_APIKEYCHECK_URL, $hostUrl, $rqcJournalId);
		return RqcCall::curlcall($url, $rqcJournalAPIKey, "GET", array(), $strict);
	}

/**
	 * Call curl for mhs_submission (POST) or mhs_apikeycheck (GET) and return an array
	 * containing status and output, where output has key 'json' (decoded JSON) or
	 * 'body' (HTML string or redirect URL string).
	 * @param string $url  the complete URL to call
	 * @param string $rqcJournalAPIKey
	 * @param string $mode  "GET" or "POST"
	 * @param string $postbody data to be sent in body (for POST mode only)
	 * @param bool   $strict  whether to do proper SSL checking
	 * @return array  status and error information
	 */
	static function curlcall(string $url, string $rqcJournalAPIKey, string $mode, array $postdata,
	                         bool $strict): array
	{
		assert($mode == "GET" || $mode == "POST");
		assert($postdata || $mode == "GET");
		$result = array();
		//----- prepare call:
		$cc = curl_init($url);
		$http_headers = array(
			'Authorization: Bearer ' . $rqcJournalAPIKey,  // a la https://datatracker.ietf.org/doc/html/rfc6750
			'X-RQC-API-VERSION: ' . RQC_API_VERSION,
			'X-RQC-MHS-ADAPTER: ' . RQC_MHS_ADAPTER,  // imprecise: lacking a version
			'X-RQC-MHS-VERSION: ' . RQC_PLUGIN_VERSION,  // precise for plugin, questionable for OJS itself
			'X-RQC-TIME: ' . (new DateTime())->format('Y-m-d\TH:i:s\Z'),
		);
		if ($mode == "POST") {
			$http_headers[] = 'Content-Type: application/json';
		}
		$curlopts = array(
			CURLOPT_POST => ($mode == "POST"),
			CURLOPT_RETURNTRANSFER => TRUE,
			CURLOPT_HTTPHEADER => $http_headers);
		if ($mode == "POST") {
			$curlopts[CURLOPT_POSTFIELDS] = json_encode($postdata, JSON_PRETTY_PRINT);
			$result['request'] = $postdata;
		}
		curl_setopt_array($cc, $curlopts);
		if ($strict) {
			curl_setopt($cc, CURLOPT_SSL_VERIFYPEER, true);
			curl_setopt($cc, CURLOPT_SSL_VERIFYHOST, 2);  // 2:check host name against cert, 0:don't
		} else  {
			curl_setopt($cc, CURLOPT_SSL_VERIFYPEER, false);
			curl_setopt($cc, CURLOPT_SSL_VERIFYHOST, 0);  // 2:check host name against cert, 0:don't

}
		//----- make call:
		$body = curl_exec($cc);
		$curl_error = curl_error($cc);
		$status = curl_getinfo($cc, CURLINFO_RESPONSE_CODE);
		$content_type = curl_getinfo($cc, CURLINFO_CONTENT_TYPE);
		curl_close($cc);
		//----- handle call errors:
		if ($curl_error) {
			$result['status'] = 400;
			$result['response'] = array('error' => $curl_error);
			return $result;  // return prematurely
		}
		//----- create $result:
		$result['status'] = $status;
		if ($content_type == 'application/json') {  //----- handle expected JSON response:
			$result['response'] = json_decode($body, true);
		}
		else {                                      //----- handle unexpected response:
			error_log($body);  // TODO 1: make proper log message
			$result['response'] = array('error' => "received an unexpected non-JSON response from RQC",
				'responsebody' => $body);
		}
		return $result;
	}
}