forked from GNUsocial/gnu-social
284 lines
9.4 KiB
PHP
284 lines
9.4 KiB
PHP
<?php
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/**
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* Socket wrapper class used by Socket Adapter
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*
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* PHP version 5
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*
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* LICENSE:
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*
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* Copyright (c) 2008-2012, Alexey Borzov <avb@php.net>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * The names of the authors may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @category HTTP
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* @package HTTP_Request2
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* @author Alexey Borzov <avb@php.net>
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* @license http://opensource.org/licenses/bsd-license.php New BSD License
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* @version SVN: $Id: SocketWrapper.php 324935 2012-04-07 07:10:50Z avb $
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* @link http://pear.php.net/package/HTTP_Request2
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*/
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/** Exception classes for HTTP_Request2 package */
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require_once 'HTTP/Request2/Exception.php';
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/**
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* Socket wrapper class used by Socket Adapter
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*
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* Needed to properly handle connection errors, global timeout support and
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* similar things. Loosely based on Net_Socket used by older HTTP_Request.
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*
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* @category HTTP
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* @package HTTP_Request2
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* @author Alexey Borzov <avb@php.net>
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* @license http://opensource.org/licenses/bsd-license.php New BSD License
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* @version Release: 2.1.1
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* @link http://pear.php.net/package/HTTP_Request2
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* @link http://pear.php.net/bugs/bug.php?id=19332
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* @link http://tools.ietf.org/html/rfc1928
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*/
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class HTTP_Request2_SocketWrapper
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{
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/**
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* PHP warning messages raised during stream_socket_client() call
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* @var array
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*/
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protected $connectionWarnings = array();
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/**
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* Connected socket
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* @var resource
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*/
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protected $socket;
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/**
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* Sum of start time and global timeout, exception will be thrown if request continues past this time
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* @var integer
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*/
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protected $deadline;
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/**
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* Global timeout value, mostly for exception messages
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* @var integer
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*/
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protected $timeout;
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/**
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* Class constructor, tries to establish connection
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*
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* @param string $address Address for stream_socket_client() call,
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* e.g. 'tcp://localhost:80'
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* @param int $timeout Connection timeout (seconds)
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* @param array $sslOptions SSL context options
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*
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* @throws HTTP_Request2_LogicException
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* @throws HTTP_Request2_ConnectionException
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*/
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public function __construct($address, $timeout, array $sslOptions = array())
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{
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$context = stream_context_create();
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foreach ($sslOptions as $name => $value) {
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if (!stream_context_set_option($context, 'ssl', $name, $value)) {
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throw new HTTP_Request2_LogicException(
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"Error setting SSL context option '{$name}'"
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);
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}
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}
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set_error_handler(array($this, 'connectionWarningsHandler'));
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$this->socket = stream_socket_client(
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$address, $errno, $errstr, $timeout, STREAM_CLIENT_CONNECT, $context
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);
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restore_error_handler();
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if (!$this->socket) {
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$error = $errstr ? $errstr : implode("\n", $this->connectionWarnings);
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throw new HTTP_Request2_ConnectionException(
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"Unable to connect to {$address}. Error: {$error}", 0, $errno
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);
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}
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}
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/**
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* Destructor, disconnects socket
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*/
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public function __destruct()
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{
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fclose($this->socket);
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}
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/**
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* Wrapper around fread(), handles global request timeout
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*
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* @param int $length Reads up to this number of bytes
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*
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* @return string Data read from socket
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* @throws HTTP_Request2_MessageException In case of timeout
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*/
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public function read($length)
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{
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if ($this->deadline) {
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stream_set_timeout($this->socket, max($this->deadline - time(), 1));
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}
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$data = fread($this->socket, $length);
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$this->checkTimeout();
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return $data;
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}
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/**
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* Reads until either the end of the socket or a newline, whichever comes first
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*
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* Strips the trailing newline from the returned data, handles global
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* request timeout. Method idea borrowed from Net_Socket PEAR package.
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*
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* @param int $bufferSize buffer size to use for reading
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*
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* @return string Available data up to the newline (not including newline)
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* @throws HTTP_Request2_MessageException In case of timeout
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*/
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public function readLine($bufferSize)
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{
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$line = '';
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while (!feof($this->socket)) {
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if ($this->deadline) {
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stream_set_timeout($this->socket, max($this->deadline - time(), 1));
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}
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$line .= @fgets($this->socket, $bufferSize);
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$this->checkTimeout();
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if (substr($line, -1) == "\n") {
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return rtrim($line, "\r\n");
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}
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}
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return $line;
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}
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/**
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* Wrapper around fwrite(), handles global request timeout
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*
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* @param string $data String to be written
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*
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* @return int
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* @throws HTTP_Request2_MessageException
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*/
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public function write($data)
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{
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if ($this->deadline) {
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stream_set_timeout($this->socket, max($this->deadline - time(), 1));
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}
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$written = fwrite($this->socket, $data);
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$this->checkTimeout();
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// http://www.php.net/manual/en/function.fwrite.php#96951
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if ($written < strlen($data)) {
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throw new HTTP_Request2_MessageException('Error writing request');
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}
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return $written;
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}
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/**
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* Tests for end-of-file on a socket
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*
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* @return bool
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*/
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public function eof()
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{
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return feof($this->socket);
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}
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/**
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* Sets request deadline
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*
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* @param int $deadline Exception will be thrown if request continues
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* past this time
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* @param int $timeout Original request timeout value, to use in
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* Exception message
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*/
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public function setDeadline($deadline, $timeout)
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{
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$this->deadline = $deadline;
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$this->timeout = $timeout;
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}
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/**
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* Turns on encryption on a socket
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*
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* @throws HTTP_Request2_ConnectionException
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*/
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public function enableCrypto()
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{
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$modes = array(
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STREAM_CRYPTO_METHOD_TLS_CLIENT,
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STREAM_CRYPTO_METHOD_SSLv3_CLIENT,
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STREAM_CRYPTO_METHOD_SSLv23_CLIENT,
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STREAM_CRYPTO_METHOD_SSLv2_CLIENT
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);
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foreach ($modes as $mode) {
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if (stream_socket_enable_crypto($this->socket, true, $mode)) {
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return;
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}
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}
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throw new HTTP_Request2_ConnectionException(
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'Failed to enable secure connection when connecting through proxy'
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);
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}
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/**
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* Throws an Exception if stream timed out
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*
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* @throws HTTP_Request2_MessageException
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*/
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protected function checkTimeout()
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{
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$info = stream_get_meta_data($this->socket);
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if ($info['timed_out'] || $this->deadline && time() > $this->deadline) {
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$reason = $this->deadline
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? "after {$this->timeout} second(s)"
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: 'due to default_socket_timeout php.ini setting';
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throw new HTTP_Request2_MessageException(
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"Request timed out {$reason}", HTTP_Request2_Exception::TIMEOUT
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);
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}
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}
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/**
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* Error handler to use during stream_socket_client() call
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*
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* One stream_socket_client() call may produce *multiple* PHP warnings
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* (especially OpenSSL-related), we keep them in an array to later use for
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* the message of HTTP_Request2_ConnectionException
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*
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* @param int $errno error level
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* @param string $errstr error message
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*
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* @return bool
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*/
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protected function connectionWarningsHandler($errno, $errstr)
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{
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if ($errno & E_WARNING) {
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array_unshift($this->connectionWarnings, $errstr);
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}
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return true;
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}
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}
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?>
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