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<?php
/**
* This helper builds the Header 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 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 Header object for the /mail/send API call
*
* An object containing key/value pairs of header names and the value to substitute
* for them. You must ensure these are properly encoded if they contain unicode
* characters. Must not be one of the reserved headers
*
* @package SendGrid\Mail
*/
class Header implements \JsonSerializable
{
/** @var $key string Header key */
private $key;
/** @var $value string Header value */
private $value;
/**
* Optional constructor
*
* @param string|null $key Header key
* @param string|null $value Header value
*/
public function __construct($key = null, $value = null)
{
if (isset($key)) {
$this->setKey($key);
}
if (isset($value)) {
$this->setValue($value);
}
}
/**
* Add the key on a Header object
*
* @param string $key Header key
*
* @throws TypeException
*/
public function setKey($key)
{
if (!is_string($key)) {
throw new TypeException('$key must be of type string.');
}
$this->key = $key;
}
/**
* Retrieve the key from a Header object
*
* @return string
*/
public function getKey()
{
return $this->key;
}
/**
* Add the value on a Header object
*
* @param string $value Header value
*
* @throws TypeException
*/
public function setValue($value)
{
if (!is_string($value)) {
throw new TypeException('$value must be of type string.');
}
$this->value = $value;
}
/**
* Retrieve the value from a Header object
*
* @return string
*/
public function getValue()
{
return $this->value;
}
/**
* Return an array representing a Header object for the SendGrid API
*
* @return null|array
*/
public function jsonSerialize()
{
return array_filter(
[
'key' => $this->getKey(),
'value' => $this->getValue()
],
function ($value) {
return $value !== null;
}
) ?: null;
}
}
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