/class.c2dm.php

<?php
/**
 * A single class for Android Cloud to Device messaging
 *
 * The clever bits are copied from
 * http://stackoverflow.com/questions/4121508/c2dm-implementation-php-code/5232809#5232809
 */


class C2DM {
	private $source;
	private $authCode;
	private $username;
	private $password;

	public function __construct() {

	}

	public function setSource($s) {
		$this->source = $s;
	}

	public function setUsername($u) {
		$this->username = $u;
	}

	public function setPassword($p) {
		$this->password = $p;
	}

	public function setAuthCode($a) {
		$this->authCode = $a;
	}

	public function getAuthCode() {
		if($this->authCode) {
			return $this->authCode;
		} else {
			return $this->googleAuthenticate();
		}
	}

	/**
	 * Get the ClientLogin token for ac2dm. Techinically, you can change the service
	 * and get a token for whatever you please
	 */
	public function googleAuthenticate($service="ac2dm") {
		if(empty($this->username) || empty($this->password) || empty($this->source)) {
			throw new Exception("Username, password and source must all be set to get auth code");
		}

		$ch = curl_init();
		if(!$ch){
			throw new Exception("Curl must be enabled");
		}

		curl_setopt($ch, CURLOPT_URL, "https://www.google.com/accounts/ClientLogin");
		$post_fields = "accountType=" . urlencode('HOSTED_OR_GOOGLE')
			. "&Email=" . urlencode($this->username)
			. "&Passwd=" . urlencode($this->password)
			. "&source=" . urlencode($this->source)
			. "&service=" . urlencode($service);
		curl_setopt($ch, CURLOPT_HEADER, true);
		curl_setopt($ch, CURLOPT_POST, true);
		curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($ch, CURLOPT_FRESH_CONNECT, true);
		curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

		$response = curl_exec($ch);

		curl_close($ch);

		if (strpos($response, '200 OK') === false) {
			throw new InvalidResponseException($response);
		}

		// find the auth code
		preg_match("/(Auth=)([\w|-]+)/", $response, $matches);

		if (!$matches[2]) {
			throw new Exception("Can't parse the auth code from the response");
		}

		$this->authCode = $matches[2];
		return $matches[2];
	}

	public function send($deviceRegistrationId, $msgType, $payloadData = null, $retry = true) {
		$auth = $this->getAuthCode();

		$headers = array('Authorization: GoogleLogin auth=' . $auth);
		$data = array(
			'registration_id' => $deviceRegistrationId,
			'collapse_key' => $msgType
		);

		if(!empty($payloadData)) {
			foreach($payloadData as $key => $value) {
				$data['data.' . $key] = $value;
			}
		}

		$curlpost = "";
		foreach($data as $key=>$value) {
			$curlpost .= "{$key}={$value}&";
		}
		$curlpost = rtrim($curlpost, '&');

		$ch = curl_init();

		curl_setopt($ch, CURLOPT_URL, "https://android.apis.google.com/c2dm/send");
		curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
		curl_setopt($ch, CURLOPT_POSTFIELDS, $curlpost);
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
		curl_setopt($ch, CURLOPT_POST, true);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		//curl_setopt($ch, CURLOPT_HEADER, true);
		//curl_setopt($ch, CURLINFO_HEADER_OUT, true);

		$response = curl_exec($ch);

		$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
		if($code == 200) {
			if(strpos($response, "Error") !== false) {
				throw new Exception($response);
			}
		} else if ($code == 401) {
			$this->authCode = null;
			if($retry) {
				$this->send($deviceRegistrationId, $msgType, $payloadData, false);
			}
		} else {
			throw new Exception("C2DM Message returned code {$code}");
		}

		curl_close($ch);

		return $response;
	}
}

/**
 * C2DM renamed to GCM
 * http://developer.android.com/guide/google/gcm/c2dm.html
 */
class GCM extends C2DM {
	private $apiKey;

	public function __construct() {
		parent::__construct();
	}

	public function setApiKey($a) {
		$this->apiKey = $a;
	}

	/**
	 * Get the ClientLogin token for GCM
	 */
	public function googleAuthenticate($service="ac2dm") {
		return parent::googleAuthenticate($service);
	}

	public function send($deviceRegistrationId, $msgType, $payloadData = null, $retry = true) {
		$headers = array(
			"Content-Type: application/json; charset=utf-8",
			"Authorization: key=" . $this->apiKey
		);
		$data = array(
			'registration_ids' => array($deviceRegistrationId),
			'collapse_key' => $msgType,
			'data' => array()
		);

		if(!empty($payloadData)) {
			foreach($payloadData as $key => $value) {
				$data['data'][$key] = $value;
			}
		}

		$ch = curl_init();

		curl_setopt($ch, CURLOPT_URL, "https://android.googleapis.com/gcm/send");
		curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
		curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
		curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		//curl_setopt($ch, CURLOPT_HEADER, true);
		//curl_setopt($ch, CURLINFO_HEADER_OUT, true);

		$response = curl_exec($ch);

		$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
		if($code == 200) {
			if(strpos($response, "Error") !== false) {
				throw new Exception($response);
			}
		} else if ($code == 401) {
			$this->authCode = null;
			if($retry) {
				$this->send($deviceRegistrationId, $msgType, $payloadData, false);
			}
		} else {
			throw new Exception("GCM Message returned code {$code}");
		}

		curl_close($ch);

		return $response;
	}
}