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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\Http\Client\Adapter;
use Traversable;
use Zend\Http\Client\Adapter\AdapterInterface as HttpAdapter;
use Zend\Http\Client\Adapter\Exception as AdapterException;
use Zend\Http\Response;
use Zend\Stdlib\ArrayUtils;
use Zend\Stdlib\ErrorHandler;
/**
* A sockets based (stream\socket\client) adapter class for Zend\Http\Client. Can be used
* on almost every PHP environment, and does not require any special extensions.
*/
class Socket implements HttpAdapter, StreamInterface
{
/**
* Map SSL transport wrappers to stream crypto method constants
*
* @var array
*/
protected static $sslCryptoTypes = array(
'ssl' => STREAM_CRYPTO_METHOD_SSLv23_CLIENT,
'sslv2' => STREAM_CRYPTO_METHOD_SSLv2_CLIENT,
'sslv3' => STREAM_CRYPTO_METHOD_SSLv3_CLIENT,
'tls' => STREAM_CRYPTO_METHOD_TLS_CLIENT,
);
/**
* The socket for server connection
*
* @var resource|null
*/
protected $socket = null;
/**
* What host/port are we connected to?
*
* @var array
*/
protected $connectedTo = array(null, null);
/**
* Stream for storing output
*
* @var resource
*/
protected $outStream = null;
/**
* Parameters array
*
* @var array
*/
protected $config = array(
'persistent' => false,
'ssltransport' => 'ssl',
'sslcert' => null,
'sslpassphrase' => null,
'sslverifypeer' => true,
'sslcafile' => null,
'sslcapath' => null,
'sslallowselfsigned' => false,
'sslusecontext' => false,
);
/**
* Request method - will be set by write() and might be used by read()
*
* @var string
*/
protected $method = null;
/**
* Stream context
*
* @var resource
*/
protected $context = null;
/**
* Adapter constructor, currently empty. Config is set using setOptions()
*
*/
public function __construct()
{
}
/**
* Set the configuration array for the adapter
*
* @param array|Traversable $options
* @throws AdapterException\InvalidArgumentException
*/
public function setOptions($options = array())
{
if ($options instanceof Traversable) {
$options = ArrayUtils::iteratorToArray($options);
}
if (!is_array($options)) {
throw new AdapterException\InvalidArgumentException(
'Array or Zend\Config object expected, got ' . gettype($options)
);
}
foreach ($options as $k => $v) {
$this->config[strtolower($k)] = $v;
}
}
/**
* Retrieve the array of all configuration options
*
* @return array
*/
public function getConfig()
{
return $this->config;
}
/**
* Set the stream context for the TCP connection to the server
*
* Can accept either a pre-existing stream context resource, or an array
* of stream options, similar to the options array passed to the
* stream_context_create() PHP function. In such case a new stream context
* will be created using the passed options.
*
* @since Zend Framework 1.9
*
* @param mixed $context Stream context or array of context options
* @throws Exception\InvalidArgumentException
* @return Socket
*/
public function setStreamContext($context)
{
if (is_resource($context) && get_resource_type($context) == 'stream-context') {
$this->context = $context;
} elseif (is_array($context)) {
$this->context = stream_context_create($context);
} else {
// Invalid parameter
throw new AdapterException\InvalidArgumentException(
"Expecting either a stream context resource or array, got " . gettype($context)
);
}
return $this;
}
/**
* Get the stream context for the TCP connection to the server.
*
* If no stream context is set, will create a default one.
*
* @return resource
*/
public function getStreamContext()
{
if (! $this->context) {
$this->context = stream_context_create();
}
return $this->context;
}
/**
* Connect to the remote server
*
* @param string $host
* @param int $port
* @param bool $secure
* @throws AdapterException\RuntimeException
*/
public function connect($host, $port = 80, $secure = false)
{
// If we are connected to the wrong host, disconnect first
$connectedHost = (strpos($this->connectedTo[0], '://'))
? substr($this->connectedTo[0], (strpos($this->connectedTo[0], '://') + 3), strlen($this->connectedTo[0]))
: $this->connectedTo[0];
if ($connectedHost != $host || $this->connectedTo[1] != $port) {
if (is_resource($this->socket)) {
$this->close();
}
}
// Now, if we are not connected, connect
if (!is_resource($this->socket) || ! $this->config['keepalive']) {
$context = $this->getStreamContext();
if ($secure || $this->config['sslusecontext']) {
if ($this->config['sslverifypeer'] !== null) {
if (!stream_context_set_option($context, 'ssl', 'verify_peer', $this->config['sslverifypeer'])) {
throw new AdapterException\RuntimeException('Unable to set sslverifypeer option');
}
}
if ($this->config['sslcafile']) {
if (!stream_context_set_option($context, 'ssl', 'cafile', $this->config['sslcafile'])) {
throw new AdapterException\RuntimeException('Unable to set sslcafile option');
}
}
if ($this->config['sslcapath']) {
if (!stream_context_set_option($context, 'ssl', 'capath', $this->config['sslcapath'])) {
throw new AdapterException\RuntimeException('Unable to set sslcapath option');
}
}
if ($this->config['sslallowselfsigned'] !== null) {
if (!stream_context_set_option($context, 'ssl', 'allow_self_signed', $this->config['sslallowselfsigned'])) {
throw new AdapterException\RuntimeException('Unable to set sslallowselfsigned option');
}
}
if ($this->config['sslcert'] !== null) {
if (!stream_context_set_option($context, 'ssl', 'local_cert', $this->config['sslcert'])) {
throw new AdapterException\RuntimeException('Unable to set sslcert option');
}
}
if ($this->config['sslpassphrase'] !== null) {
if (!stream_context_set_option($context, 'ssl', 'passphrase', $this->config['sslpassphrase'])) {
throw new AdapterException\RuntimeException('Unable to set sslpassphrase option');
}
}
}
$flags = STREAM_CLIENT_CONNECT;
if ($this->config['persistent']) {
$flags |= STREAM_CLIENT_PERSISTENT;
}
ErrorHandler::start();
$this->socket = stream_socket_client(
$host . ':' . $port,
$errno,
$errstr,
(int) $this->config['timeout'],
$flags,
$context
);
$error = ErrorHandler::stop();
if (!$this->socket) {
$this->close();
throw new AdapterException\RuntimeException(
sprintf(
'Unable to connect to %s:%d%s',
$host,
$port,
($error ? ' . Error #' . $error->getCode() . ': ' . $error->getMessage() : '')
),
0,
$error
);
}
// Set the stream timeout
if (!stream_set_timeout($this->socket, (int) $this->config['timeout'])) {
throw new AdapterException\RuntimeException('Unable to set the connection timeout');
}
if ($secure || $this->config['sslusecontext']) {
if ($this->config['ssltransport'] && isset(static::$sslCryptoTypes[$this->config['ssltransport']])) {
$sslCryptoMethod = static::$sslCryptoTypes[$this->config['ssltransport']];
} else {
$sslCryptoMethod = STREAM_CRYPTO_METHOD_SSLv3_CLIENT;
}
ErrorHandler::start();
$test = stream_socket_enable_crypto($this->socket, true, $sslCryptoMethod);
$error = ErrorHandler::stop();
if (!$test || $error) {
// Error handling is kind of difficult when it comes to SSL
$errorString = '';
if (extension_loaded('openssl')) {
while (($sslError = openssl_error_string()) != false) {
$errorString .= "; SSL error: $sslError";
}
}
$this->close();
if ((! $errorString) && $this->config['sslverifypeer']) {
// There's good chance our error is due to sslcapath not being properly set
if (! ($this->config['sslcafile'] || $this->config['sslcapath'])) {
$errorString = 'make sure the "sslcafile" or "sslcapath" option are properly set for the environment.';
} elseif ($this->config['sslcafile'] && !is_file($this->config['sslcafile'])) {
$errorString = 'make sure the "sslcafile" option points to a valid SSL certificate file';
} elseif ($this->config['sslcapath'] && !is_dir($this->config['sslcapath'])) {
$errorString = 'make sure the "sslcapath" option points to a valid SSL certificate directory';
}
}
if ($errorString) {
$errorString = ": $errorString";
}
throw new AdapterException\RuntimeException(sprintf(
'Unable to enable crypto on TCP connection %s%s',
$host,
$errorString
), 0, $error);
}
$host = $this->config['ssltransport'] . "://" . $host;
} else {
$host = 'tcp://' . $host;
}
// Update connectedTo
$this->connectedTo = array($host, $port);
}
}
/**
* Send request to the remote server
*
* @param string $method
* @param \Zend\Uri\Uri $uri
* @param string $httpVer
* @param array $headers
* @param string $body
* @throws AdapterException\RuntimeException
* @return string Request as string
*/
public function write($method, $uri, $httpVer = '1.1', $headers = array(), $body = '')
{
// Make sure we're properly connected
if (! $this->socket) {
throw new AdapterException\RuntimeException('Trying to write but we are not connected');
}
$host = $uri->getHost();
$host = (strtolower($uri->getScheme()) == 'https' ? $this->config['ssltransport'] : 'tcp') . '://' . $host;
if ($this->connectedTo[0] != $host || $this->connectedTo[1] != $uri->getPort()) {
throw new AdapterException\RuntimeException('Trying to write but we are connected to the wrong host');
}
// Save request method for later
$this->method = $method;
// Build request headers
$path = $uri->getPath();
if ($uri->getQuery()) {
$path .= '?' . $uri->getQuery();
}
$request = "{$method} {$path} HTTP/{$httpVer}\r\n";
foreach ($headers as $k => $v) {
if (is_string($k)) {
$v = ucfirst($k) . ": $v";
}
$request .= "$v\r\n";
}
if (is_resource($body)) {
$request .= "\r\n";
} else {
// Add the request body
$request .= "\r\n" . $body;
}
// Send the request
ErrorHandler::start();
$test = fwrite($this->socket, $request);
$error = ErrorHandler::stop();
if (false === $test) {
throw new AdapterException\RuntimeException('Error writing request to server', 0, $error);
}
if (is_resource($body)) {
if (stream_copy_to_stream($body, $this->socket) == 0) {
throw new AdapterException\RuntimeException('Error writing request to server');
}
}
return $request;
}
/**
* Read response from server
*
* @throws AdapterException\RuntimeException
* @return string
*/
public function read()
{
// First, read headers only
$response = '';
$gotStatus = false;
while (($line = fgets($this->socket)) !== false) {
$gotStatus = $gotStatus || (strpos($line, 'HTTP') !== false);
if ($gotStatus) {
$response .= $line;
if (rtrim($line) === '') {
break;
}
}
}
$this->_checkSocketReadTimeout();
$responseObj= Response::fromString($response);
$statusCode = $responseObj->getStatusCode();
// Handle 100 and 101 responses internally by restarting the read again
if ($statusCode == 100 || $statusCode == 101) {
return $this->read();
}
// Check headers to see what kind of connection / transfer encoding we have
$headers = $responseObj->getHeaders();
/**
* Responses to HEAD requests and 204 or 304 responses are not expected
* to have a body - stop reading here
*/
if ($statusCode == 304 || $statusCode == 204 ||
$this->method == \Zend\Http\Request::METHOD_HEAD) {
// Close the connection if requested to do so by the server
$connection = $headers->get('connection');
if ($connection && $connection->getFieldValue() == 'close') {
$this->close();
}
return $response;
}
// If we got a 'transfer-encoding: chunked' header
$transferEncoding = $headers->get('transfer-encoding');
$contentLength = $headers->get('content-length');
if ($transferEncoding !== false) {
if (strtolower($transferEncoding->getFieldValue()) == 'chunked') {
do {
$line = fgets($this->socket);
$this->_checkSocketReadTimeout();
$chunk = $line;
// Figure out the next chunk size
$chunksize = trim($line);
if (! ctype_xdigit($chunksize)) {
$this->close();
throw new AdapterException\RuntimeException('Invalid chunk size "' .
$chunksize . '" unable to read chunked body');
}
// Convert the hexadecimal value to plain integer
$chunksize = hexdec($chunksize);
// Read next chunk
$readTo = ftell($this->socket) + $chunksize;
do {
$currentPos = ftell($this->socket);
if ($currentPos >= $readTo) {
break;
}
if ($this->outStream) {
if (stream_copy_to_stream($this->socket, $this->outStream, $readTo - $currentPos) == 0) {
$this->_checkSocketReadTimeout();
break;
}
} else {
$line = fread($this->socket, $readTo - $currentPos);
if ($line === false || strlen($line) === 0) {
$this->_checkSocketReadTimeout();
break;
}
$chunk .= $line;
}
} while (! feof($this->socket));
ErrorHandler::start();
$chunk .= fgets($this->socket);
ErrorHandler::stop();
$this->_checkSocketReadTimeout();
if (!$this->outStream) {
$response .= $chunk;
}
} while ($chunksize > 0);
} else {
$this->close();
throw new AdapterException\RuntimeException('Cannot handle "' .
$transferEncoding->getFieldValue() . '" transfer encoding');
}
// We automatically decode chunked-messages when writing to a stream
// this means we have to disallow the Zend\Http\Response to do it again
if ($this->outStream) {
$response = str_ireplace("Transfer-Encoding: chunked\r\n", '', $response);
}
// Else, if we got the content-length header, read this number of bytes
} elseif ($contentLength !== false) {
// If we got more than one Content-Length header (see ZF-9404) use
// the last value sent
if (is_array($contentLength)) {
$contentLength = $contentLength[count($contentLength) - 1];
}
$contentLength = $contentLength->getFieldValue();
$currentPos = ftell($this->socket);
for ($readTo = $currentPos + $contentLength;
$readTo > $currentPos;
$currentPos = ftell($this->socket)) {
if ($this->outStream) {
if (stream_copy_to_stream($this->socket, $this->outStream, $readTo - $currentPos) == 0) {
$this->_checkSocketReadTimeout();
break;
}
} else {
$chunk = fread($this->socket, $readTo - $currentPos);
if ($chunk === false || strlen($chunk) === 0) {
$this->_checkSocketReadTimeout();
break;
}
$response .= $chunk;
}
// Break if the connection ended prematurely
if (feof($this->socket)) {
break;
}
}
// Fallback: just read the response until EOF
} else {
do {
if ($this->outStream) {
if (stream_copy_to_stream($this->socket, $this->outStream) == 0) {
$this->_checkSocketReadTimeout();
break;
}
} else {
$buff = fread($this->socket, 8192);
if ($buff === false || strlen($buff) === 0) {
$this->_checkSocketReadTimeout();
break;
} else {
$response .= $buff;
}
}
} while (feof($this->socket) === false);
$this->close();
}
// Close the connection if requested to do so by the server
$connection = $headers->get('connection');
if ($connection && $connection->getFieldValue() == 'close') {
$this->close();
}
return $response;
}
/**
* Close the connection to the server
*
*/
public function close()
{
if (is_resource($this->socket)) {
ErrorHandler::start();
fclose($this->socket);
ErrorHandler::stop();
}
$this->socket = null;
$this->connectedTo = array(null, null);
}
/**
* Check if the socket has timed out - if so close connection and throw
* an exception
*
* @throws AdapterException\TimeoutException with READ_TIMEOUT code
*/
protected function _checkSocketReadTimeout()
{
if ($this->socket) {
$info = stream_get_meta_data($this->socket);
$timedout = $info['timed_out'];
if ($timedout) {
$this->close();
throw new AdapterException\TimeoutException(
"Read timed out after {$this->config['timeout']} seconds",
AdapterException\TimeoutException::READ_TIMEOUT
);
}
}
}
/**
* Set output stream for the response
*
* @param resource $stream
* @return \Zend\Http\Client\Adapter\Socket
*/
public function setOutputStream($stream)
{
$this->outStream = $stream;
return $this;
}
/**
* Destructor: make sure the socket is disconnected
*
* If we are in persistent TCP mode, will not close the connection
*
*/
public function __destruct()
{
if (! $this->config['persistent']) {
if ($this->socket) {
$this->close();
}
}
}
}