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This brings SimplePie in sync with the most up to date version, 1.5.5. This update brings many bug fixes, small enhancements, and PHP compatibility fixes for newer versions of PHP. For a full list of changes, see https://github.com/simplepie/simplepie/blob/master/CHANGELOG.md#155-may-1-2020. Props dshanske, slushman, etruel, wpshades, dmenard, desrosj, hareesh-pillai, stevenkword, jrf, Ipstenu, johnbillion. Fixes #36669. Built from https://develop.svn.wordpress.org/trunk@47733 git-svn-id: http://core.svn.wordpress.org/trunk@47509 1a063a9b-81f0-0310-95a4-ce76da25c4cd
519 lines
11 KiB
PHP
519 lines
11 KiB
PHP
<?php
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/**
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* SimplePie
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*
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* A PHP-Based RSS and Atom Feed Framework.
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* Takes the hard work out of managing a complete RSS/Atom solution.
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*
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* Copyright (c) 2004-2016, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors
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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 modification, are
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* permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* * Neither the name of the SimplePie Team nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
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* AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @package SimplePie
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* @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue
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* @author Ryan Parman
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* @author Sam Sneddon
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* @author Ryan McCue
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* @link http://simplepie.org/ SimplePie
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License
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*/
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/**
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* HTTP Response Parser
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*
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* @package SimplePie
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* @subpackage HTTP
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*/
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class SimplePie_HTTP_Parser
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{
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/**
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* HTTP Version
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*
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* @var float
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*/
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public $http_version = 0.0;
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/**
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* Status code
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*
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* @var int
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*/
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public $status_code = 0;
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/**
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* Reason phrase
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*
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* @var string
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*/
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public $reason = '';
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/**
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* Key/value pairs of the headers
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*
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* @var array
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*/
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public $headers = array();
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/**
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* Body of the response
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*
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* @var string
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*/
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public $body = '';
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/**
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* Current state of the state machine
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*
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* @var string
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*/
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protected $state = 'http_version';
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/**
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* Input data
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*
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* @var string
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*/
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protected $data = '';
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/**
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* Input data length (to avoid calling strlen() everytime this is needed)
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*
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* @var int
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*/
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protected $data_length = 0;
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/**
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* Current position of the pointer
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*
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* @var int
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*/
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protected $position = 0;
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/**
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* Name of the hedaer currently being parsed
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*
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* @var string
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*/
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protected $name = '';
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/**
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* Value of the hedaer currently being parsed
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*
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* @var string
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*/
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protected $value = '';
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/**
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* Create an instance of the class with the input data
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*
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* @param string $data Input data
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*/
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public function __construct($data)
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{
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$this->data = $data;
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$this->data_length = strlen($this->data);
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}
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/**
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* Parse the input data
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*
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* @return bool true on success, false on failure
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*/
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public function parse()
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{
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while ($this->state && $this->state !== 'emit' && $this->has_data())
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{
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$state = $this->state;
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$this->$state();
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}
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$this->data = '';
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if ($this->state === 'emit' || $this->state === 'body')
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{
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return true;
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}
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$this->http_version = '';
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$this->status_code = '';
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$this->reason = '';
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$this->headers = array();
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$this->body = '';
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return false;
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}
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/**
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* Check whether there is data beyond the pointer
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*
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* @return bool true if there is further data, false if not
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*/
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protected function has_data()
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{
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return (bool) ($this->position < $this->data_length);
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}
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/**
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* See if the next character is LWS
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*
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* @return bool true if the next character is LWS, false if not
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*/
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protected function is_linear_whitespace()
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{
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return (bool) ($this->data[$this->position] === "\x09"
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|| $this->data[$this->position] === "\x20"
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|| ($this->data[$this->position] === "\x0A"
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&& isset($this->data[$this->position + 1])
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&& ($this->data[$this->position + 1] === "\x09" || $this->data[$this->position + 1] === "\x20")));
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}
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/**
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* Parse the HTTP version
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*/
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protected function http_version()
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{
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if (strpos($this->data, "\x0A") !== false && strtoupper(substr($this->data, 0, 5)) === 'HTTP/')
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{
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$len = strspn($this->data, '0123456789.', 5);
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$this->http_version = substr($this->data, 5, $len);
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$this->position += 5 + $len;
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if (substr_count($this->http_version, '.') <= 1)
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{
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$this->http_version = (float) $this->http_version;
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$this->position += strspn($this->data, "\x09\x20", $this->position);
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$this->state = 'status';
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}
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else
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{
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$this->state = false;
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}
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}
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else
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{
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$this->state = false;
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}
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}
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/**
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* Parse the status code
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*/
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protected function status()
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{
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if ($len = strspn($this->data, '0123456789', $this->position))
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{
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$this->status_code = (int) substr($this->data, $this->position, $len);
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$this->position += $len;
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$this->state = 'reason';
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}
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else
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{
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$this->state = false;
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}
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}
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/**
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* Parse the reason phrase
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*/
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protected function reason()
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{
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$len = strcspn($this->data, "\x0A", $this->position);
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$this->reason = trim(substr($this->data, $this->position, $len), "\x09\x0D\x20");
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$this->position += $len + 1;
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$this->state = 'new_line';
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}
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/**
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* Deal with a new line, shifting data around as needed
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*/
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protected function new_line()
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{
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$this->value = trim($this->value, "\x0D\x20");
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if ($this->name !== '' && $this->value !== '')
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{
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$this->name = strtolower($this->name);
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// We should only use the last Content-Type header. c.f. issue #1
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if (isset($this->headers[$this->name]) && $this->name !== 'content-type')
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{
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$this->headers[$this->name] .= ', ' . $this->value;
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}
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else
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{
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$this->headers[$this->name] = $this->value;
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}
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}
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$this->name = '';
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$this->value = '';
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if (substr($this->data[$this->position], 0, 2) === "\x0D\x0A")
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{
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$this->position += 2;
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$this->state = 'body';
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}
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elseif ($this->data[$this->position] === "\x0A")
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{
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$this->position++;
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$this->state = 'body';
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}
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else
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{
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$this->state = 'name';
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}
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}
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/**
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* Parse a header name
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*/
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protected function name()
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{
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$len = strcspn($this->data, "\x0A:", $this->position);
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if (isset($this->data[$this->position + $len]))
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{
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if ($this->data[$this->position + $len] === "\x0A")
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{
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$this->position += $len;
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$this->state = 'new_line';
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}
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else
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{
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$this->name = substr($this->data, $this->position, $len);
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$this->position += $len + 1;
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$this->state = 'value';
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}
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}
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else
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{
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$this->state = false;
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}
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}
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/**
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* Parse LWS, replacing consecutive LWS characters with a single space
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*/
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protected function linear_whitespace()
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{
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do
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{
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if (substr($this->data, $this->position, 2) === "\x0D\x0A")
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{
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$this->position += 2;
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}
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elseif ($this->data[$this->position] === "\x0A")
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{
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$this->position++;
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}
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$this->position += strspn($this->data, "\x09\x20", $this->position);
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} while ($this->has_data() && $this->is_linear_whitespace());
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$this->value .= "\x20";
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}
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/**
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* See what state to move to while within non-quoted header values
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*/
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protected function value()
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{
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if ($this->is_linear_whitespace())
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{
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$this->linear_whitespace();
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}
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else
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{
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switch ($this->data[$this->position])
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{
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case '"':
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// Workaround for ETags: we have to include the quotes as
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// part of the tag.
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if (strtolower($this->name) === 'etag')
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{
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$this->value .= '"';
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$this->position++;
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$this->state = 'value_char';
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break;
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}
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$this->position++;
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$this->state = 'quote';
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break;
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case "\x0A":
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$this->position++;
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$this->state = 'new_line';
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break;
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default:
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$this->state = 'value_char';
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break;
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}
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}
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}
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/**
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* Parse a header value while outside quotes
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*/
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protected function value_char()
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{
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$len = strcspn($this->data, "\x09\x20\x0A\"", $this->position);
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$this->value .= substr($this->data, $this->position, $len);
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$this->position += $len;
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$this->state = 'value';
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}
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/**
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* See what state to move to while within quoted header values
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*/
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protected function quote()
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{
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if ($this->is_linear_whitespace())
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{
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$this->linear_whitespace();
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}
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else
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{
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switch ($this->data[$this->position])
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{
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case '"':
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$this->position++;
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$this->state = 'value';
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break;
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case "\x0A":
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$this->position++;
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$this->state = 'new_line';
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break;
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case '\\':
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$this->position++;
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$this->state = 'quote_escaped';
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break;
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default:
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$this->state = 'quote_char';
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break;
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}
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}
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}
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/**
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* Parse a header value while within quotes
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*/
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protected function quote_char()
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{
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$len = strcspn($this->data, "\x09\x20\x0A\"\\", $this->position);
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$this->value .= substr($this->data, $this->position, $len);
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$this->position += $len;
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$this->state = 'value';
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}
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/**
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* Parse an escaped character within quotes
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*/
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protected function quote_escaped()
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{
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$this->value .= $this->data[$this->position];
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$this->position++;
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$this->state = 'quote';
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}
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/**
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* Parse the body
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*/
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protected function body()
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{
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$this->body = substr($this->data, $this->position);
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if (!empty($this->headers['transfer-encoding']))
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{
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unset($this->headers['transfer-encoding']);
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$this->state = 'chunked';
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}
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else
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{
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$this->state = 'emit';
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}
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}
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/**
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* Parsed a "Transfer-Encoding: chunked" body
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*/
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protected function chunked()
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{
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if (!preg_match('/^([0-9a-f]+)[^\r\n]*\r\n/i', trim($this->body)))
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{
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$this->state = 'emit';
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return;
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}
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$decoded = '';
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$encoded = $this->body;
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while (true)
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{
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$is_chunked = (bool) preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', $encoded, $matches );
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if (!$is_chunked)
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{
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// Looks like it's not chunked after all
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$this->state = 'emit';
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return;
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}
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$length = hexdec(trim($matches[1]));
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if ($length === 0)
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{
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// Ignore trailer headers
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$this->state = 'emit';
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$this->body = $decoded;
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return;
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}
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$chunk_length = strlen($matches[0]);
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$decoded .= $part = substr($encoded, $chunk_length, $length);
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$encoded = substr($encoded, $chunk_length + $length + 2);
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if (trim($encoded) === '0' || empty($encoded))
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{
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$this->state = 'emit';
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$this->body = $decoded;
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return;
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}
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}
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}
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/**
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* Prepare headers (take care of proxies headers)
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*
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* @param string $headers Raw headers
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* @param integer $count Redirection count. Default to 1.
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*
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* @return string
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*/
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static public function prepareHeaders($headers, $count = 1)
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{
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$data = explode("\r\n\r\n", $headers, $count);
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$data = array_pop($data);
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if (false !== stripos($data, "HTTP/1.0 200 Connection established\r\n\r\n")) {
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$data = str_ireplace("HTTP/1.0 200 Connection established\r\n\r\n", '', $data);
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}
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if (false !== stripos($data, "HTTP/1.1 200 Connection established\r\n\r\n")) {
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$data = str_ireplace("HTTP/1.1 200 Connection established\r\n\r\n", '', $data);
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}
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return $data;
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}
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}
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