gnu-social/plugins/TwitterBridge/jsonstreamreader.php

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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* PHP version 5
*
* LICENCE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Plugin
* @package StatusNet
* @author Brion Vibber <brion@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
class OAuthData
{
public $consumer_key, $consumer_secret, $token, $token_secret;
}
/**
*
*/
abstract class JsonStreamReader
{
const CRLF = "\r\n";
public $id;
protected $socket = null;
protected $state = 'init'; // 'init', 'connecting', 'waiting', 'headers', 'active'
public function __construct()
{
$this->id = get_class($this) . '.' . substr(md5(mt_rand()), 0, 8);
}
/**
* Starts asynchronous connect operation...
*
* @param <type> $url
*/
public function connect($url)
{
common_log(LOG_DEBUG, "$this->id opening connection to $url");
$scheme = parse_url($url, PHP_URL_SCHEME);
if ($scheme == 'http') {
$rawScheme = 'tcp';
} else if ($scheme == 'https') {
$rawScheme = 'ssl';
} else {
throw new ServerException('Invalid URL scheme for HTTP stream reader');
}
$host = parse_url($url, PHP_URL_HOST);
$port = parse_url($url, PHP_URL_PORT);
if (!$port) {
if ($scheme == 'https') {
$port = 443;
} else {
$port = 80;
}
}
$path = parse_url($url, PHP_URL_PATH);
$query = parse_url($url, PHP_URL_QUERY);
if ($query) {
$path .= '?' . $query;
}
$errno = $errstr = null;
$timeout = 5;
//$flags = STREAM_CLIENT_CONNECT | STREAM_CLIENT_ASYNC_CONNECT;
$flags = STREAM_CLIENT_CONNECT;
// @fixme add SSL params
$this->socket = stream_socket_client("$rawScheme://$host:$port", $errno, $errstr, $timeout, $flags);
$this->send($this->httpOpen($host, $path));
stream_set_blocking($this->socket, false);
$this->state = 'waiting';
}
/**
* Send some fun data off to the server.
*
* @param string $buffer
*/
function send($buffer)
{
fwrite($this->socket, $buffer);
}
/**
* Read next packet of data from the socket.
*
* @return string
*/
function read()
{
$buffer = fread($this->socket, 65536);
return $buffer;
}
protected function httpOpen($host, $path)
{
$lines = array(
"GET $path HTTP/1.1",
"Host: $host",
"User-Agent: StatusNet/" . STATUSNET_VERSION . " (TwitterBridgePlugin)",
"Connection: close",
"",
""
);
return implode(self::CRLF, $lines);
}
/**
* Close the current connection, if open.
*/
public function close()
{
if ($this->isConnected()) {
common_log(LOG_DEBUG, "$this->id closing connection.");
fclose($this->socket);
$this->socket = null;
}
}
/**
* Are we currently connected?
*
* @return boolean
*/
public function isConnected()
{
return $this->socket !== null;
}
/**
* Send any sockets we're listening on to the IO manager
* to wait for input.
*
* @return array of resources
*/
public function getSockets()
{
if ($this->isConnected()) {
return array($this->socket);
}
return array();
}
/**
* Take a chunk of input over the horn and go go go! :D
* @param string $buffer
*/
function handleInput($socket)
{
if ($this->socket !== $socket) {
throw new Exception('Got input from unexpected socket!');
}
$buffer = $this->read();
switch ($this->state)
{
case 'waiting':
$this->handleInputWaiting($buffer);
break;
case 'headers':
$this->handleInputHeaders($buffer);
break;
case 'active':
$this->handleInputActive($buffer);
break;
default:
throw new Exception('Invalid state in handleInput: ' . $this->state);
}
}
function handleInputWaiting($buffer)
{
common_log(LOG_DEBUG, "$this->id Does this happen? " . $buffer);
$this->state = 'headers';
$this->handleInputHeaders($buffer);
}
function handleInputHeaders($buffer)
{
$lines = explode(self::CRLF, $buffer);
foreach ($lines as $line) {
if ($this->state == 'headers') {
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$this->handleLineHeaders($line);
} else if ($this->state == 'active') {
$this->handleLineActive($line);
}
}
}
function handleInputActive($buffer)
{
// One JSON object on each line...
// Will we always deliver on packet boundaries?
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$lines = explode(self::CRLF, $buffer);
foreach ($lines as $line) {
$this->handleLineActive($line);
}
}
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function handleLineHeaders($line)
{
if ($line == '') {
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$this->state = 'active';
common_log(LOG_DEBUG, "$this->id connection is active!");
} else {
common_log(LOG_DEBUG, "$this->id read HTTP header: $line");
$this->responseHeaders[] = $line;
}
}
function handleLineActive($line)
{
if ($line == "") {
// Server sends empty lines as keepalive.
return;
}
$data = json_decode($line, true);
if ($data) {
$this->handleJson($data);
} else {
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common_log(LOG_ERR, "$this->id received bogus JSON data: " . var_export($line, true));
}
}
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abstract protected function handleJson(array $data);
}