<?php

if (!class_exists('EBDN_EbaySession')):

    class EBDN_EbaySession {

        private $requestToken;
        private $devID;
        private $appID;
        private $certID;
        private $serverUrl;
        private $compatLevel;
        private $siteID;
        private $verb;

        public function __construct($userRequestToken, $developerID, $applicationID, $certificateID, $serverUrl, $compatabilityLevel, $siteToUseID, $callName) {
            $this->requestToken = $userRequestToken;
            $this->devID = $developerID;
            $this->appID = $applicationID;
            $this->certID = $certificateID;
            $this->compatLevel = $compatabilityLevel;
            $this->siteID = $siteToUseID;
            $this->verb = $callName;
            $this->serverUrl = $serverUrl;
        }

        /** 	sendHttpRequest
          Sends a HTTP request to the server for this session
          Input:	$requestBody
          Output:	The HTTP Response as a String
         */
        public function sendHttpRequest($requestBody) {
            //build eBay headers using variables passed via constructor
            $headers = $this->buildEbayHeaders();

            //initialise a CURL session
            $connection = curl_init();
            //set the server we are using (could be Sandbox or Production server)
            curl_setopt($connection, CURLOPT_URL, $this->serverUrl);

            //stop CURL from verifying the peer's certificate
            curl_setopt($connection, CURLOPT_SSL_VERIFYPEER, 0);
            curl_setopt($connection, CURLOPT_SSL_VERIFYHOST, 0);

            //set the headers using the array of headers
            curl_setopt($connection, CURLOPT_HTTPHEADER, $headers);

            //set method as POST
            curl_setopt($connection, CURLOPT_POST, 1);

            //set the XML body of the request
            curl_setopt($connection, CURLOPT_POSTFIELDS, $requestBody);

            //set it to return the transfer as a string from curl_exec
            curl_setopt($connection, CURLOPT_RETURNTRANSFER, 1);

            //Send the Request
            $response = curl_exec($connection);

            //close the connection
            curl_close($connection);

            //return the response
            return $response;
        }

        /** 	buildEbayHeaders
          Generates an array of string to be used as the headers for the HTTP request to eBay
          Output:	String Array of Headers applicable for this call
         */
        private function buildEbayHeaders() {
            $headers = array(
                //Regulates versioning of the XML interface for the API
                'X-EBAY-API-COMPATIBILITY-LEVEL: ' . $this->compatLevel,
                //set the keys
                'X-EBAY-API-DEV-NAME: ' . $this->devID,
                'X-EBAY-API-APP-NAME: ' . $this->appID,
                'X-EBAY-API-CERT-NAME: ' . $this->certID,
                //the name of the call we are requesting
                'X-EBAY-API-CALL-NAME: ' . $this->verb,
                //SiteID must also be set in the Request's XML
                //SiteID = 0  (US) - UK = 3, Canada = 2, Australia = 15, ....
                //SiteID Indicates the eBay site to associate the call with
                'X-EBAY-API-SITEID: ' . $this->siteID,
            );

            return $headers;
        }

    }

    

    

endif;