class EBaySessionProduct

<?php

namespace App\Ebay;

class EBaySessionProduct
{
    public $requestToken;
    public $devID;
    public $appID;
    public $certID;
    public $serverUrl;
    public $compatLevel;
    public $siteID;
    public $verb;

    /** __construct
        Constructor to make a new instance of eBaySession with the details needed to make a call
        Input:  $userRequestToken - the authentication token fir the user making the call
                $developerID - Developer key obtained when registered at http://developer.ebay.com
                $applicationID - Application key obtained when registered at http://developer.ebay.com
                $certificateID - Certificate key obtained when registered at http://developer.ebay.com
                $useTestServer - Boolean, if true then Sandbox server is used, otherwise production server is used
                $compatabilityLevel - API version this is compatable with
                $siteToUseID - the Id of the eBay site to associate the call iwht (0 = US, 2 = Canada, 3 = UK, ...)
                $callName  - The name of the call being made (e.g. 'GeteBayOfficialTime')
        Output: Response string returned by the server
    */
    public function __construct($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;
    }
}