<?php

/**
 * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
 *
 * You are hereby granted a non-exclusive, worldwide, royalty-free license to
 * use, copy, modify, and distribute this software in source code or binary
 * form for use in connection with the web services and APIs provided by
 * Facebook.
 *
 * As with any software that integrates with the Facebook platform, your use
 * of this software is subject to the Facebook Developer Principles and
 * Policies [http://developers.facebook.com/policy/]. This copyright notice
 * shall be included in all copies or substantial portions of the software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 */
namespace PixelCaffeine\Dependencies\FacebookAds;

class Session implements \PixelCaffeine\Dependencies\FacebookAds\SessionInterface
{
    /**
     * @var string
     */
    protected $appId;
    /**
     * @var string
     */
    protected $appSecret;
    /**
     * @var string
     */
    protected $accessToken;
    /**
     * @var string
     */
    protected $appSecretProof;
    /**
     * @param string $app_id
     * @param string $app_secret
     * @param string $access_token
     */
    public function __construct($app_id, $app_secret, $access_token)
    {
        $this->appId = $app_id;
        $this->appSecret = $app_secret;
        $this->accessToken = $access_token;
    }
    /**
     * @return string
     */
    public function getAppId()
    {
        return $this->appId;
    }
    /**
     * @return string
     */
    public function getAppSecret()
    {
        return $this->appSecret;
    }
    /**
     * @return string
     */
    public function getAccessToken()
    {
        return $this->accessToken;
    }
    /**
     * @return string
     */
    public function getAppSecretProof()
    {
        if ($this->getAppSecret() === null) {
            return null;
        }
        if ($this->appSecretProof === null) {
            $this->appSecretProof = \hash_hmac('sha256', $this->getAccessToken(), $this->getAppSecret());
        }
        return $this->appSecretProof;
    }
    /**
     * @return array
     */
    public function getRequestParameters()
    {
        if ($this->getAppSecretProof() !== null) {
            return array('access_token' => $this->getAccessToken(), 'appsecret_proof' => $this->getAppSecretProof());
        } else {
            return array('access_token' => $this->getAccessToken());
        }
    }
}
