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WebSocketServer.php
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WebSocketServer.php
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<?php
// WebSocketServer implementation in PHP
// by Bryan Bliewert, nVentis@GitHub
class WebSocketClient {
// get according socket in WebSocketServer using $this->Sockets[$Client->ID]
public
$ID,
$Headers = null,
$Handshake = null,
$timeCreated= null;
function __construct($Socket){
$this->ID = intval($Socket);
$this->timeCreated = time();
}
}
class WebSocketServer {
public
$logToFile = false,
$logFile = "log.txt",
$logToDisplay = true,
$Sockets = array(),
$bufferLength = 2048,
$maxClients = 20,
// applied with Start()
$errorReport = E_ALL,
$timeLimit = 0,
$implicitFlush = true;
protected
$Address,
$Port,
$socketMaster,
$Clients = array();
public function Log($M){
$M = "[". date(DATE_RFC1036, time()) ."] - $M \r\n";
if ($this->logToFile) file_put_contents($this->logFile, $M, FILE_APPEND);
if ($this->logToDisplay) echo $M;
}
protected function addClient($Socket){
$ClientID = intval($Socket);
$this->Clients[$ClientID] = new WebSocketClient($Socket);
$this->Sockets[$ClientID] = $Socket;
return $ClientID;
}
protected function getClient($Socket){
return $this->Clients[intval($Socket)];
}
public function Close($Socket){
socket_close($Socket);
$SocketID = intval($Socket);
unset($this->Clients[$SocketID]);
unset($this->Sockets[$SocketID]);
$this->onClose($SocketID);
return $SocketID;
}
protected function Handshake($Socket, $Buffer) {
$SocketID = intval($Socket);
$magicGUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
$Headers = array();
$Lines = explode("\n", $Buffer);
foreach ($Lines as $Line) {
if (strpos($Line, ":") !== false) {
$Header = explode(":", $Line, 2);
$Headers[strtolower(trim($Header[0]))] = trim($Header[1]);
} elseif (stripos($Line, "get ") !== false) {
preg_match("/GET (.*) HTTP/i", $Buffer, $reqResource);
$Headers['get'] = trim($reqResource[1]);
}
}
if (!isset($Headers['host'])
|| !isset($Headers['sec-websocket-key'])
|| (!isset($Headers['upgrade']) || strtolower($Headers['upgrade']) != 'websocket')
|| (!isset($Headers['connection']) || strpos(strtolower($Headers['connection']), 'upgrade') === FALSE))
$addHeader = "HTTP/1.1 400 Bad Request";
if (!isset($Headers['sec-websocket-version']) || strtolower($Headers['sec-websocket-version']) != 13)
$addHeader = "HTTP/1.1 426 Upgrade Required\r\nSec-WebSocketVersion: 13";
if (!isset($Headers['get']))
$addHeader = "HTTP/1.1 405 Method Not Allowed\r\n\r\n";
if (isset($addHeader)) {
@socket_write($Socket, $addHeader, strlen($addHeader));
$this->onError($SocketID, "Handshake aborted - [". trim($addHeader)."]");
return $this->Close($Socket);
}
$Token = "";
for ($i = 0; $i < 20; $i++) {
$Token .= chr(hexdec(substr(sha1($Headers['sec-websocket-key'] . $magicGUID), $i * 2, 2)));
}
$Token = base64_encode($Token) . "\r\n";
$addHeader = "HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: $Token\r\n";
@socket_write($Socket, $addHeader, strlen($addHeader));
$this->Clients[$SocketID]->Headers = $Headers;
$this->Clients[$SocketID]->Handshake = $Buffer;
$this->onOpen($SocketID);
}
protected function Encode($M) {
// inspiration for Encode() method : http://stackoverflow.com/questions/8125507/how-can-i-send-and-receive-websocket-messages-on-the-server-side
$L = strlen($M);
$bHead = [];
$bHead[0] = 129; // 0x1 text frame (FIN + opcode)
if ($L <= 125) {
$bHead[1] = $L;
} else if ($L >= 126 && $L <= 65535) {
$bHead[1] = 126;
$bHead[2] = ( $L >> 8 ) & 255;
$bHead[3] = ( $L ) & 255;
} else {
$bHead[1] = 127;
$bHead[2] = ( $L >> 56 ) & 255;
$bHead[3] = ( $L >> 48 ) & 255;
$bHead[4] = ( $L >> 40 ) & 255;
$bHead[5] = ( $L >> 32 ) & 255;
$bHead[6] = ( $L >> 24 ) & 255;
$bHead[7] = ( $L >> 16 ) & 255;
$bHead[8] = ( $L >> 8 ) & 255;
$bHead[9] = ( $L ) & 255;
}
return (implode(array_map("chr", $bHead)) . $M);
}
public function Write($SocketID, $M){
$M = $this->Encode($M);
return @socket_write($this->Sockets[$SocketID], $M, strlen($M));
}
protected function Decode($M){
$M = array_map("ord", str_split($M));
$L = $M[1] AND 127;
if ($L == 126)
$iFM = 4;
else if ($L == 127)
$iFM = 10;
else
$iFM = 2;
$Masks = array_slice($M, $iFM, 4);
$Out = "";
for ($i = $iFM + 4, $j = 0; $i < count($M); $i++, $j++ ) {
$Out .= chr($M[$i] ^ $Masks[$j % 4]);
}
return $Out;
}
public function Read($SocketID, $M){
$this->onData($SocketID, $this->Decode($M));
}
function __construct($Address, $Port){
$this->socketMaster = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if (!is_resource($this->socketMaster))
$this->Log("The master socket could not be created: ".socket_strerror(socket_last_error()), true);
socket_set_option($this->socketMaster, SOL_SOCKET, SO_REUSEADDR, 1);
if (!socket_bind($this->socketMaster, $Address, $Port))
$this->Log("Can't bind on master socket: ".socket_strerror(socket_last_error()), true);
if(!socket_listen($this->socketMaster, $this->maxClients))
$this->Log("Can't listen on master socket: ".socket_strerror(socket_last_error()), true);
$this->Sockets["m"] = $this->socketMaster;
$this->Log("Server initilaized on $Address:$Port");
}
public function Start(){
$this->Log("Starting server...");
error_reporting($this->errorReport);
set_time_limit($this->timeLimit);
if ($this->implicitFlush) ob_implicit_flush();
while (true){
if (empty($this->Sockets)) $this->Sockets["m"] = $this->socketMaster;
$socketArrayRead = $this->Sockets;
$socketArrayWrite = $socketArrayExceptions = NULL;
// by-ref function, thus we can now iterate over the array
@socket_select($socketArrayRead, $socketArrayWrite, $socketArrayExceptions, NULL);
foreach($socketArrayRead as $Socket){
$SocketID = intval($Socket);
if ($Socket == $this->socketMaster){
$Client = socket_accept($Socket);
if (!is_resource($Client)){
$this->onError($SocketID, "Connection could not be established");
continue;
} else {
$this->addClient($Client);
$this->onOpening($SocketID);
}
} else {
$receivedBytes = @socket_recv($Socket, $dataBuffer, $this->bufferLength, 0);
if ($receivedBytes === false) {
// on error
$sockerError = socket_last_error($Socket);
$socketErrorM = socket_strerror($sockerError);
if ($sockerError >= 100){
$this->onError($SocketID, "Unexpected disconnect with error $sockerError [$socketErrorM]");
$this->Close($Socket);
} else {
$this->onOther($SocketID, "Other socket error $sockerError [$socketErrorM]");
$this->Close($Socket);
}
} elseif($receivedBytes == 0) {
// no headers received (at all) --> disconnect
$SocketID = $this->Close($Socket);
$this->onError($SocketID, "Client disconnected - TCP connection lost");
} else {
// no error, --> check handshake
$Client = $this->getClient($Socket);
$this->Log("Client $SocketID is known - Handshake : " . (($Client->Handshake == false) ? "NO" : "TRUE" ) );
if ($Client->Handshake == false){
if (strpos(str_replace("\r", '', $dataBuffer), "\n\n") === false ) { // headers have not been completely received --> wait --> handshake
$this->onOther($SocketID, "Continue receving headers"); continue;
}
$this->Handshake($Socket, $dataBuffer);
} else {
$this->Read($SocketID, $dataBuffer);
}
}
}
}
}
}
// Methods to be configured by the user; executed directly after...
function onOpen ($SocketID ) //...successful handshake
{ $this->Log("Handshake with socket #$SocketID successful"); }
function onData ($SocketID, $M ) // ...message receipt; $M contains the decoded message
{ $this->Log("Received ". strlen($M) . " Bytes from socket #$SocketID"); }
function onClose($SocketID ) // ...socket has been closed AND deleted
{ $this->Log("Connection closed to socket #$SocketID"); }
function onError($SocketID, $M ) // ...any connection-releated error
{ $this->Log("Socket $SocketID - ". $M); }
function onOther($SocketID, $M ) // ...any connection-releated notification
{ $this->Log("Socket $SocketID - ". $M); }
function onOpening($SocketID ) // ...being accepted and added to the client list
{ $this->Log("New client connecting on socket #$SocketID"); }
}
?>