Service.php

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<?php

namespace IMSGlobal\LTI\ToolProvider\Service;

use IMSGlobal\LTI\ToolProvider;
use IMSGlobal\LTI\HTTPMessage;

class Service
{

    public $unsigned = false;

    protected $endpoint;
    private $consumer;
    private $mediaType;

    public function __construct($consumer, $endpoint, $mediaType)
    {

        $this->consumer = $consumer;
        $this->endpoint = $endpoint;
        $this->mediaType = $mediaType;

    }

    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;

    }

}