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Filename : OpenTracking.php
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<?php
/**
 * This helper builds the OpenTracking object for a /mail/send API call
 *
 * PHP Version - 5.6, 7.0, 7.1, 7.2
 *
 * @package   SendGrid\Mail
 * @author    Elmer Thomas <dx@sendgrid.com>
 * @copyright 2018-19 Twilio SendGrid
 * @license   https://opensource.org/licenses/MIT The MIT License
 * @version   GIT: <git_id>
 * @link      http://packagist.org/packages/sendgrid/sendgrid
 */

namespace SendGrid\Mail;

/**
 * This class is used to construct a OpenTracking object for the /mail/send API call
 *
 * Allows you to track whether the email was opened or not, but including a single
 * pixel image in the body of the content. When the pixel is loaded, we can log that
 * the email was opened
 *
 * @package SendGrid\Mail
 */
class OpenTracking implements \JsonSerializable
{
    /** @var $enable bool Indicates if this setting is enabled */
    private $enable;
    /** @var $substitution_tag string Allows you to specify a substitution tag that you can insert in the body of your email at a location that you desire. This tag will be replaced by the open tracking pixel */
    private $substitution_tag;

    /**
     * Optional constructor
     *
     * @param bool|null $enable Indicates if this setting is enabled
     * @param string|null $substitution_tag Allows you to specify a substitution
     *                                      tag that you can insert in the body
     *                                      of your email at a location that you
     *                                      desire. This tag will be replaced by
     *                                      the open tracking pixel
     */
    public function __construct($enable = null, $substitution_tag = null)
    {
        if (isset($enable)) {
            $this->setEnable($enable);
        }
        if (isset($substitution_tag)) {
            $this->setSubstitutionTag($substitution_tag);
        }
    }

    /**
     * Update the enable setting on a OpenTracking object
     *
     * @param bool $enable Indicates if this setting is enabled
     * 
     * @throws TypeException
     */ 
    public function setEnable($enable)
    {
        if (!is_bool($enable)) {
            throw new TypeException('$enable must be of type bool');
        }
        $this->enable = $enable;
    }

    /**
     * Retrieve the enable setting on a OpenTracking object
     *
     * @return bool
     */
    public function getEnable()
    {
        return $this->enable;
    }

    /**
     * Set the substitution tag on a OpenTracking object
     *
     * @param string $substitution_tag Allows you to specify a substitution
     *                                 tag that you can insert in the body
     *                                 of your email at a location that you
     *                                 desire. This tag will be replaced by
     *                                 the open tracking pixel
     * 
     * @throws TypeException
     */ 
    public function setSubstitutionTag($substitution_tag)
    {
        if (!is_string($substitution_tag)) {
            throw new TypeException('$substitution_tag must be of type string.');
        }
        $this->substitution_tag = $substitution_tag;
    }

    /**
     * Retrieve the substitution tag from a OpenTracking object
     *
     * @return string
     */
    public function getSubstitutionTag()
    {
        return $this->substitution_tag;
    }

    /**
     * Return an array representing a OpenTracking object for the Twilio SendGrid API
     *
     * @return null|array
     */
    public function jsonSerialize()
    {
        return array_filter(
            [
                'enable' => $this->getEnable(),
                'substitution_tag' => $this->getSubstitutionTag()
            ],
            function ($value) {
                return $value !== null;
            }
        ) ?: null;
    }
}