557 lines
13 KiB
PHP
557 lines
13 KiB
PHP
<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014 - 2019, British Columbia Institute of Technology
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
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* @license https://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 1.0.0
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* @filesource
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*/
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defined('BASEPATH') OR exit('No direct script access allowed');
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/**
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* Trackback Class
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*
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* Trackback Sending/Receiving Class
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*
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* @package CodeIgniter
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* @subpackage Libraries
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* @category Trackbacks
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* @author EllisLab Dev Team
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* @link https://codeigniter.com/user_guide/libraries/trackback.html
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*/
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class CI_Trackback {
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/**
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* Character set
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*
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* @var string
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*/
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public $charset = 'UTF-8';
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/**
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* Trackback data
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*
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* @var array
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*/
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public $data = array(
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'url' => '',
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'title' => '',
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'excerpt' => '',
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'blog_name' => '',
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'charset' => ''
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);
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/**
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* Convert ASCII flag
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*
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* Whether to convert high-ASCII and MS Word
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* characters to HTML entities.
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*
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* @var bool
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*/
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public $convert_ascii = TRUE;
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/**
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* Response
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*
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* @var string
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*/
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public $response = '';
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/**
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* Error messages list
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*
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* @var string[]
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*/
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public $error_msg = array();
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// --------------------------------------------------------------------
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/**
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* Constructor
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*
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* @return void
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*/
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public function __construct()
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{
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log_message('info', 'Trackback Class Initialized');
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}
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// --------------------------------------------------------------------
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/**
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* Send Trackback
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*
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* @param array
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* @return bool
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*/
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public function send($tb_data)
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{
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if ( ! is_array($tb_data))
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{
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$this->set_error('The send() method must be passed an array');
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return FALSE;
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}
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// Pre-process the Trackback Data
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foreach (array('url', 'title', 'excerpt', 'blog_name', 'ping_url') as $item)
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{
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if ( ! isset($tb_data[$item]))
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{
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$this->set_error('Required item missing: '.$item);
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return FALSE;
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}
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switch ($item)
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{
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case 'ping_url':
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$$item = $this->extract_urls($tb_data[$item]);
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break;
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case 'excerpt':
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$$item = $this->limit_characters($this->convert_xml(strip_tags(stripslashes($tb_data[$item]))));
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break;
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case 'url':
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$$item = str_replace('-', '-', $this->convert_xml(strip_tags(stripslashes($tb_data[$item]))));
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break;
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default:
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$$item = $this->convert_xml(strip_tags(stripslashes($tb_data[$item])));
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break;
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}
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// Convert High ASCII Characters
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if ($this->convert_ascii === TRUE && in_array($item, array('excerpt', 'title', 'blog_name'), TRUE))
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{
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$$item = $this->convert_ascii($$item);
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}
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}
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// Build the Trackback data string
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$charset = isset($tb_data['charset']) ? $tb_data['charset'] : $this->charset;
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$data = 'url='.rawurlencode($url).'&title='.rawurlencode($title).'&blog_name='.rawurlencode($blog_name)
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.'&excerpt='.rawurlencode($excerpt).'&charset='.rawurlencode($charset);
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// Send Trackback(s)
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$return = TRUE;
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if (count($ping_url) > 0)
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{
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foreach ($ping_url as $url)
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{
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if ($this->process($url, $data) === FALSE)
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{
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$return = FALSE;
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}
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}
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}
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return $return;
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}
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// --------------------------------------------------------------------
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/**
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* Receive Trackback Data
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*
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* This function simply validates the incoming TB data.
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* It returns FALSE on failure and TRUE on success.
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* If the data is valid it is set to the $this->data array
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* so that it can be inserted into a database.
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*
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* @return bool
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*/
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public function receive()
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{
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foreach (array('url', 'title', 'blog_name', 'excerpt') as $val)
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{
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if (empty($_POST[$val]))
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{
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$this->set_error('The following required POST variable is missing: '.$val);
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return FALSE;
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}
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$this->data['charset'] = isset($_POST['charset']) ? strtoupper(trim($_POST['charset'])) : 'auto';
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if ($val !== 'url' && MB_ENABLED === TRUE)
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{
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if (MB_ENABLED === TRUE)
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{
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$_POST[$val] = mb_convert_encoding($_POST[$val], $this->charset, $this->data['charset']);
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}
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elseif (ICONV_ENABLED === TRUE)
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{
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$_POST[$val] = @iconv($this->data['charset'], $this->charset.'//IGNORE', $_POST[$val]);
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}
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}
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$_POST[$val] = ($val !== 'url') ? $this->convert_xml(strip_tags($_POST[$val])) : strip_tags($_POST[$val]);
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if ($val === 'excerpt')
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{
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$_POST['excerpt'] = $this->limit_characters($_POST['excerpt']);
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}
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$this->data[$val] = $_POST[$val];
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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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* Send Trackback Error Message
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*
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* Allows custom errors to be set. By default it
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* sends the "incomplete information" error, as that's
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* the most common one.
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*
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* @param string
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* @return void
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*/
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public function send_error($message = 'Incomplete Information')
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{
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exit('<?xml version="1.0" encoding="utf-8"?'.">\n<response>\n<error>1</error>\n<message>".$message."</message>\n</response>");
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}
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// --------------------------------------------------------------------
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/**
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* Send Trackback Success Message
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*
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* This should be called when a trackback has been
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* successfully received and inserted.
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*
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* @return void
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*/
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public function send_success()
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{
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exit('<?xml version="1.0" encoding="utf-8"?'.">\n<response>\n<error>0</error>\n</response>");
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}
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// --------------------------------------------------------------------
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/**
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* Fetch a particular item
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*
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* @param string
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* @return string
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*/
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public function data($item)
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{
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return isset($this->data[$item]) ? $this->data[$item] : '';
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}
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// --------------------------------------------------------------------
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/**
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* Process Trackback
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*
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* Opens a socket connection and passes the data to
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* the server. Returns TRUE on success, FALSE on failure
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*
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* @param string
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* @param string
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* @return bool
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*/
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public function process($url, $data)
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{
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$target = parse_url($url);
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// Open the socket
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if ( ! $fp = @fsockopen($target['host'], 80))
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{
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$this->set_error('Invalid Connection: '.$url);
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return FALSE;
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}
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// Build the path
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$path = isset($target['path']) ? $target['path'] : $url;
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empty($target['query']) OR $path .= '?'.$target['query'];
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// Add the Trackback ID to the data string
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if ($id = $this->get_id($url))
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{
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$data = 'tb_id='.$id.'&'.$data;
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}
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// Transfer the data
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fputs($fp, 'POST '.$path." HTTP/1.0\r\n");
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fputs($fp, 'Host: '.$target['host']."\r\n");
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fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n");
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fputs($fp, 'Content-length: '.strlen($data)."\r\n");
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fputs($fp, "Connection: close\r\n\r\n");
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fputs($fp, $data);
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// Was it successful?
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$this->response = '';
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while ( ! feof($fp))
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{
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$this->response .= fgets($fp, 128);
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}
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@fclose($fp);
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if (stripos($this->response, '<error>0</error>') === FALSE)
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{
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$message = preg_match('/<message>(.*?)<\/message>/is', $this->response, $match)
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? trim($match[1])
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: 'An unknown error was encountered';
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$this->set_error($message);
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return FALSE;
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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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* Extract Trackback URLs
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*
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* This function lets multiple trackbacks be sent.
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* It takes a string of URLs (separated by comma or
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* space) and puts each URL into an array
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*
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* @param string
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* @return string
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*/
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public function extract_urls($urls)
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{
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// Remove the pesky white space and replace with a comma, then replace doubles.
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$urls = str_replace(',,', ',', preg_replace('/\s*(\S+)\s*/', '\\1,', $urls));
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// Break into an array via commas and remove duplicates
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$urls = array_unique(preg_split('/[,]/', rtrim($urls, ',')));
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array_walk($urls, array($this, 'validate_url'));
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return $urls;
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}
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// --------------------------------------------------------------------
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/**
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* Validate URL
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*
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* Simply adds "http://" if missing
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*
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* @param string
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* @return void
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*/
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public function validate_url(&$url)
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{
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$url = trim($url);
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if (stripos($url, 'http') !== 0)
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{
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$url = 'http://'.$url;
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}
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}
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// --------------------------------------------------------------------
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/**
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* Find the Trackback URL's ID
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*
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* @param string
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* @return string
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*/
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public function get_id($url)
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{
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$tb_id = '';
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if (strpos($url, '?') !== FALSE)
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{
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$tb_array = explode('/', $url);
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$tb_end = $tb_array[count($tb_array)-1];
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if ( ! is_numeric($tb_end))
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{
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$tb_end = $tb_array[count($tb_array)-2];
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}
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$tb_array = explode('=', $tb_end);
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$tb_id = $tb_array[count($tb_array)-1];
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}
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else
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{
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$url = rtrim($url, '/');
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$tb_array = explode('/', $url);
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$tb_id = $tb_array[count($tb_array)-1];
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if ( ! is_numeric($tb_id))
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{
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$tb_id = $tb_array[count($tb_array)-2];
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}
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}
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return ctype_digit((string) $tb_id) ? $tb_id : FALSE;
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}
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// --------------------------------------------------------------------
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/**
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* Convert Reserved XML characters to Entities
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*
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* @param string
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* @return string
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*/
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public function convert_xml($str)
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{
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$temp = '__TEMP_AMPERSANDS__';
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$str = preg_replace(array('/&#(\d+);/', '/&(\w+);/'), $temp.'\\1;', $str);
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$str = str_replace(array('&', '<', '>', '"', "'", '-'),
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array('&', '<', '>', '"', ''', '-'),
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$str);
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return preg_replace(array('/'.$temp.'(\d+);/', '/'.$temp.'(\w+);/'), array('&#\\1;', '&\\1;'), $str);
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}
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// --------------------------------------------------------------------
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/**
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* Character limiter
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*
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* Limits the string based on the character count. Will preserve complete words.
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*
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* @param string
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* @param int
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* @param string
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* @return string
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*/
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public function limit_characters($str, $n = 500, $end_char = '…')
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{
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if (strlen($str) < $n)
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{
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return $str;
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}
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$str = preg_replace('/\s+/', ' ', str_replace(array("\r\n", "\r", "\n"), ' ', $str));
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if (strlen($str) <= $n)
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{
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return $str;
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}
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$out = '';
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foreach (explode(' ', trim($str)) as $val)
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{
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$out .= $val.' ';
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if (strlen($out) >= $n)
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{
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return rtrim($out).$end_char;
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}
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}
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}
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// --------------------------------------------------------------------
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/**
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* High ASCII to Entities
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*
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* Converts Hight ascii text and MS Word special chars
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* to character entities
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*
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* @param string
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* @return string
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*/
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public function convert_ascii($str)
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{
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$count = 1;
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$out = '';
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$temp = array();
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for ($i = 0, $s = strlen($str); $i < $s; $i++)
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{
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$ordinal = ord($str[$i]);
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if ($ordinal < 128)
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{
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$out .= $str[$i];
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}
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else
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{
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if (count($temp) === 0)
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{
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$count = ($ordinal < 224) ? 2 : 3;
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}
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$temp[] = $ordinal;
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if (count($temp) === $count)
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{
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$number = ($count === 3)
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? (($temp[0] % 16) * 4096) + (($temp[1] % 64) * 64) + ($temp[2] % 64)
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: (($temp[0] % 32) * 64) + ($temp[1] % 64);
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$out .= '&#'.$number.';';
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$count = 1;
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$temp = array();
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}
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}
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}
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return $out;
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}
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// --------------------------------------------------------------------
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/**
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* Set error message
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*
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* @param string
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* @return void
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*/
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public function set_error($msg)
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{
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log_message('error', $msg);
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$this->error_msg[] = $msg;
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}
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// --------------------------------------------------------------------
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/**
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* Show error messages
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*
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* @param string
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* @param string
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* @return string
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*/
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public function display_errors($open = '<p>', $close = '</p>')
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{
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return (count($this->error_msg) > 0) ? $open.implode($close.$open, $this->error_msg).$close : '';
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}
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}
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