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<?php

namespace GitHubWebhook;

class Handler

{

/**

* @var string secret passphrase

*/

private $_secret;

/**

* @var string[] response data

*/

private $_data;

/**

* @var string event type that triggered the web hook

*/

private $_event;

/**

* @var string Unique ID for this delivery

*/

private $_delivery;

/**

* @var CallbackHandler class that handle callback (obviously)

*/

private $_callbacks;

/**

* Constructor

*

* @param $secret

*/

public function __construct($secret)

{

$this->_secret = $secret;

$this->_callbacks = new CallbackHandler();

}

////// GETTER /////

/**

* @return string

*/

public function getData()

{

return $this->_data;

}

/**

* @return string

*/

public function getDelivery()

{

return $this->_delivery;

}

/**

* @return string

*/

public function getEvent()

{

return $this->_event;

}

/**

* @return string

*/

public function getSecret()

{

return $this->_secret;

}

/**

* If request is valid, then we launch our callback

*

* @see #validate()

* @return bool

*/

public function handle()

{

if (!$this->validate()) {

return false;

}

if ($this->_callbacks->hasCallback($this->_event)) {

$this->_callbacks->emit($this->_event, $this->_data);

}

//exec("git --work-tree={$this->gitDir} pull -f {$this->remote}", $this->gitOutput);

return true;

}

/**

* Validate the request to github and populate attributes with response

*

* @return bool

*/

public function validate()

{

$payload = file_get_contents('php://input');

$signature = isset($_SERVER['HTTP_X_HUB_SIGNATURE']) ? $_SERVER['HTTP_X_HUB_SIGNATURE'] : '';

// signature must be valid

if (!$this->validateSignature($signature, $payload)) {

return false;

}

// we must have those element from github in headers

if (empty($_SERVER['HTTP_X_GITHUB_EVENT']) || empty($_SERVER['HTTP_X_GITHUB_DELIVERY'])) {

return false;

}

$this->_data = json_decode($payload,true);

$this->_event = $_SERVER['HTTP_X_GITHUB_EVENT'];

$this->_delivery = $_SERVER['HTTP_X_GITHUB_DELIVERY'];

return true;

}

/**

* Validate github signature

* see https://developer.github.com/webhooks/securing/

*

* @param $gitHubSignatureHeader

* @param $payload

*

* @return bool

*/

protected function validateSignature($gitHubSignatureHeader, $payload)

{

list ($algo, $gitHubSignature) = explode("=", $gitHubSignatureHeader);

$payloadHash = hash_hmac($algo, $payload, $this->_secret);

return ($payloadHash == $gitHubSignature);

}

}