<?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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}

[301] Fix | Delete

else

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{

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$this->state = false;

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}

[305] Fix | Delete

}

[306] Fix | Delete

[307] Fix | Delete

/**

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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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}

[322] Fix | Delete

$this->position += strspn($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';

[348] Fix | Delete

break;

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}

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$this->position++;

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$this->state = 'quote';

[352] Fix | Delete

break;

[353] Fix | Delete

[354] Fix | Delete

case "\x0A":

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$this->position++;

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$this->state = 'new_line';

[357] Fix | Delete

break;

[358] Fix | Delete

[359] Fix | Delete

default:

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$this->state = 'value_char';

[361] Fix | Delete

break;

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}

[363] Fix | Delete

}

[364] Fix | Delete

}

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[366] Fix | Delete

/**

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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';

[375] Fix | Delete

}

[376] Fix | Delete

[377] Fix | Delete

/**

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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])

[389] Fix | Delete

{

[390] Fix | Delete

case '"':

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$this->position++;

[392] Fix | Delete

$this->state = 'value';

[393] Fix | Delete

break;

[394] Fix | Delete

[395] Fix | Delete

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++;

[402] Fix | Delete

$this->state = 'quote_escaped';

[403] Fix | Delete

break;

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[405] Fix | Delete

default:

[406] Fix | Delete

$this->state = 'quote_char';

[407] Fix | Delete

break;

[408] Fix | Delete

}

[409] Fix | Delete

}

[410] Fix | Delete

}

[411] Fix | Delete

[412] Fix | Delete

/**

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* Parse a header value while within quotes

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*/

[415] Fix | Delete

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;

[420] Fix | Delete

$this->state = 'value';

[421] Fix | Delete

}

[422] Fix | Delete

[423] Fix | Delete

/**

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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++;

[430] Fix | Delete

$this->state = 'quote';

[431] Fix | Delete

}

[432] Fix | Delete

[433] Fix | Delete

/**

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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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{

[441] Fix | Delete

unset($this->headers['transfer-encoding']);

[442] Fix | Delete

$this->state = 'chunked';

[443] Fix | Delete

}

[444] Fix | Delete

else

[445] Fix | Delete

{

[446] Fix | Delete

$this->state = 'emit';

[447] Fix | Delete

}

[448] Fix | Delete

}

[449] Fix | Delete

[450] Fix | Delete

/**

[451] Fix | Delete

* Parsed a "Transfer-Encoding: chunked" body

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*/

[453] Fix | Delete

protected function chunked()

[454] Fix | Delete

{

[455] Fix | Delete

if (!preg_match('/^([0-9a-f]+)[^\r\n]*\r\n/i', trim($this->body)))

[456] Fix | Delete

{

[457] Fix | Delete

$this->state = 'emit';

[458] Fix | Delete

return;

[459] Fix | Delete

}

[460] Fix | Delete

[461] Fix | Delete

$decoded = '';

[462] Fix | Delete

$encoded = $this->body;

[463] Fix | Delete

[464] Fix | Delete

while (true)

[465] Fix | Delete

{

[466] Fix | Delete

$is_chunked = (bool) preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', $encoded, $matches );

[467] Fix | Delete

if (!$is_chunked)

[468] Fix | Delete

{

[469] Fix | Delete

// Looks like it's not chunked after all

[470] Fix | Delete

$this->state = 'emit';

[471] Fix | Delete

return;

[472] Fix | Delete

}

[473] Fix | Delete

[474] Fix | Delete

$length = hexdec(trim($matches[1]));

[475] Fix | Delete

if ($length === 0)

[476] Fix | Delete

{

[477] Fix | Delete

// Ignore trailer headers

[478] Fix | Delete

$this->state = 'emit';

[479] Fix | Delete

$this->body = $decoded;

[480] Fix | Delete

return;

[481] Fix | Delete

}

[482] Fix | Delete

[483] Fix | Delete

$chunk_length = strlen($matches[0]);

[484] Fix | Delete

$decoded .= $part = substr($encoded, $chunk_length, $length);

[485] Fix | Delete

$encoded = substr($encoded, $chunk_length + $length + 2);

[486] Fix | Delete

[487] Fix | Delete

if (trim($encoded) === '0' || empty($encoded))

[488] Fix | Delete

{

[489] Fix | Delete

$this->state = 'emit';

[490] Fix | Delete

$this->body = $decoded;

[491] Fix | Delete

return;

[492] Fix | Delete

}

[493] Fix | Delete

}

[494] Fix | Delete

}

[495] Fix | Delete

[496] Fix | Delete

/**

[497] Fix | Delete

* Prepare headers (take care of proxies headers)

[498] Fix | Delete

*

[499] Fix | Delete