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<?php |
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|
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namespace DrewM\MailChimp; |
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|
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/** |
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* A MailChimp Webhook request. |
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* How to Set Up Webhooks: http://eepurl.com/bs-j_T |
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* |
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* @author Drew McLellan <drew.mclellan@gmail.com> |
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*/ |
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class Webhook |
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{ |
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private static $eventSubscriptions = array(); |
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private static $receivedWebhook = null; |
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|
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/** |
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* Subscribe to an incoming webhook request. The callback will be invoked when a matching webhook is received. |
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* |
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* @param string $event Name of the webhook event, e.g. subscribe, unsubscribe, campaign |
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* @param callable $callback A callable function to invoke with the data from the received webhook |
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* |
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* @return void |
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*/ |
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public static function subscribe($event, callable $callback) |
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{ |
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if (!isset(self::$eventSubscriptions[$event])) self::$eventSubscriptions[$event] = array(); |
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self::$eventSubscriptions[$event][] = $callback; |
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|
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self::receive(); |
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} |
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|
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/** |
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* Retrieve the incoming webhook request as sent. |
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* |
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* @param string $input An optional raw POST body to use instead of php://input - mainly for unit testing. |
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* |
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* @return array|false An associative array containing the details of the received webhook |
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*/ |
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public static function receive($input = null) |
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{ |
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if (is_null($input)) { |
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if (self::$receivedWebhook !== null) { |
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$input = self::$receivedWebhook; |
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} else { |
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$input = file_get_contents("php://input"); |
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} |
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} |
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|
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if (!is_null($input) && $input != '') { |
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return self::processWebhook($input); |
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} |
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|
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return false; |
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} |
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|
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/** |
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* Process the raw request into a PHP array and dispatch any matching subscription callbacks |
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* |
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* @param string $input The raw HTTP POST request |
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* |
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* @return array|false An associative array containing the details of the received webhook |
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*/ |
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private static function processWebhook($input) |
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{ |
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self::$receivedWebhook = $input; |
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parse_str($input, $result); |
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if ($result && isset($result['type'])) { |
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self::dispatchWebhookEvent($result['type'], $result['data']); |
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return $result; |
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} |
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|
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return false; |
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} |
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|
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/** |
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* Call any subscribed callbacks for this event |
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* |
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* @param string $event The name of the callback event |
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* @param array $data An associative array of the webhook data |
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* |
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* @return void |
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*/ |
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private static function dispatchWebhookEvent($event, $data) |
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{ |
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if (isset(self::$eventSubscriptions[$event])) { |
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foreach (self::$eventSubscriptions[$event] as $callback) { |
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$callback($data); |
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} |
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// reset subscriptions |
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self::$eventSubscriptions[$event] = array(); |
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} |
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} |
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} |
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|
