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Pubnub.php
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Pubnub.php
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<?php
/**
* PubNub 3.0 Real-time Push Cloud API
*
* @author Stephen Blum
* @package Pubnub
*/
class Pubnub {
private $ORIGIN = 'pubsub.pubnub.com';
private $PUBLISH_KEY = 'demo';
private $SUBSCRIBE_KEY = 'demo';
private $SECRET_KEY = false;
private $SSL = false;
/**
* Pubnub
*
* Init the Pubnub Client API
*
* @param string $publish_key required key to send messages.
* @param string $subscribe_key required key to receive messages.
* @param string $secret_key optional key to sign messages.
* @param string $origin optional setting for cloud origin.
* @param boolean $ssl required for 2048 bit encrypted messages.
*/
function Pubnub(
$publish_key = 'demo',
$subscribe_key = 'demo',
$secret_key = false,
$ssl = false,
$origin = false
) {
$this->PUBLISH_KEY = $publish_key;
$this->SUBSCRIBE_KEY = $subscribe_key;
$this->SECRET_KEY = $secret_key;
$this->SSL = $ssl;
if ($origin) $this->ORIGIN = $origin;
if ($ssl) $this->ORIGIN = 'https://' . $this->ORIGIN;
else $this->ORIGIN = 'http://' . $this->ORIGIN;
}
/**
* Publish
*
* Send a message to a channel.
*
* @param array $args with channel and message.
* @return array success information.
*/
function publish($args) {
## Fail if bad input.
if (!($args['channel'] && $args['message'])) {
echo('Missing Channel or Message');
return false;
}
## Capture User Input
$channel = $args['channel'];
$message = json_encode($args['message']);
## Generate String to Sign
$string_to_sign = implode( '/', array(
$this->PUBLISH_KEY,
$this->SUBSCRIBE_KEY,
$this->SECRET_KEY,
$channel,
$message
) );
## Sign Message
$signature = $this->SECRET_KEY ? md5($string_to_sign) : '0';
## Send Message
return $this->_request(array(
'publish',
$this->PUBLISH_KEY,
$this->SUBSCRIBE_KEY,
$signature,
$channel,
'0',
$message
));
}
/**
* Subscribe
*
* This is BLOCKING.
* Listen for a message on a channel.
*
* @param array $args with channel and message.
* @return mixed false on fail, array on success.
*/
function subscribe($args) {
## Capture User Input
$channel = $args['channel'];
$callback = $args['callback'];
$timetoken = isset($args['timetoken']) ? $args['timetoken'] : '0';
## Fail if missing channel
if (!$channel) {
echo("Missing Channel.\n");
return false;
}
## Fail if missing callback
if (!$callback) {
echo("Missing Callback.\n");
return false;
}
## Begin Recusive Subscribe
try {
## Wait for Message
$response = $this->_request(array(
'subscribe',
$this->SUBSCRIBE_KEY,
$channel,
'0',
$timetoken
));
$messages = $response[0];
$args['timetoken'] = $response[1];
## If it was a timeout
if (!count($messages)) {
return $this->subscribe($args);
}
## Run user Callback and Reconnect if user permits.
foreach ($messages as $message) {
if (!$callback($message)) return;
}
## Keep Listening.
return $this->subscribe($args);
}
catch (Exception $error) {
sleep(1);
return $this->subscribe($args);
}
}
/**
* History
*
* Load history from a channel.
*
* @param array $args with 'channel' and 'limit'.
* @return mixed false on fail, array on success.
*/
function history($args) {
## Capture User Input
$limit = +$args['limit'] ? +$args['limit'] : 10;
$channel = $args['channel'];
## Fail if bad input.
if (!$channel) {
echo('Missing Channel');
return false;
}
## Get History
return $this->_request(array(
'history',
$this->SUBSCRIBE_KEY,
$channel,
'0',
$limit
));
}
/**
* Time
*
* Timestamp from PubNub Cloud.
*
* @return int timestamp.
*/
function time() {
## Get History
$response = $this->_request(array(
'time',
'0'
));
return $response[0];
}
/**
* Request URL
*
* @param array $request of url directories.
* @return array from JSON response.
*/
private function _request($request) {
$request = array_map( 'Pubnub::_encode', $request );
array_unshift( $request, $this->ORIGIN );
$ctx = stream_context_create(array(
'http' => array( 'timeout' => 200 )
));
return json_decode( @file_get_contents(
implode( '/', $request ), 0, $ctx
), true );
}
/**
* Encode
*
* @param string $part of url directories.
* @return string encoded string.
*/
private static function _encode($part) {
return implode( '', array_map(
'Pubnub::_encode_char', str_split($part)
) );
}
/**
* Encode Char
*
* @param string $char val.
* @return string encoded char.
*/
private static function _encode_char($char) {
if (strpos( ' ~`!@#$%^&*()+=[]\\{}|;\':",./<>?', $char ) === false)
return $char;
return rawurlencode($char);
}
}
?>