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<?php
namespace IMSGlobal\LTI\ToolProvider\Service;
use IMSGlobal\LTI\ToolProvider;
use IMSGlobal\LTI\HTTPMessage;
/**
* Class to implement a service
*
* @author Stephen P Vickers <svickers@imsglobal.org>
* @copyright IMS Global Learning Consortium Inc
* @date 2016
* @version 3.0.0
* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
*/
class Service
{
/**
* Whether service request should be sent unsigned.
*
* @var boolean $unsigned
*/
public $unsigned = false;
/**
* Service endpoint.
*
* @var string $endpoint
*/
protected $endpoint;
/**
* Tool Consumer for this service request.
*
* @var ToolConsumer $consumer
*/
private $consumer;
/**
* Media type of message body.
*
* @var string $mediaType
*/
private $mediaType;
/**
* Class constructor.
*
* @param ToolConsumer $consumer Tool consumer object for this service request
* @param string $endpoint Service endpoint
* @param string $mediaType Media type of message body
*/
public function __construct($consumer, $endpoint, $mediaType)
{
$this->consumer = $consumer;
$this->endpoint = $endpoint;
$this->mediaType = $mediaType;
}
/**
* Send a service request.
*
* @param string $method The action type constant (optional, default is GET)
* @param array $parameters Query parameters to add to endpoint (optional, default is none)
* @param string $body Body of request (optional, default is null)
*
* @return HTTPMessage HTTP object containing request and response details
*/
public function send($method, $parameters = array(), $body = null)
{
$url = $this->endpoint;
if (!empty($parameters)) {
if (strpos($url, '?') === false) {
$sep = '?';
} else {
$sep = '&';
}
foreach ($parameters as $name => $value) {
$url .= $sep . urlencode($name) . '=' . urlencode($value);
$sep = '&';
}
}
if (!$this->unsigned) {
$header = ToolProvider\ToolConsumer::addSignature($url, $this->consumer->getKey(), $this->consumer->secret, $body, $method, $this->mediaType);
} else {
$header = null;
}
// Connect to tool consumer
$http = new HTTPMessage($url, $method, $body, $header);
// Parse JSON response
if ($http->send() && !empty($http->response)) {
$http->responseJson = json_decode($http->response);
$http->ok = !is_null($http->responseJson);
}
return $http;
}
}