forked from GNUsocial/gnu-social
639 lines
21 KiB
PHP
639 lines
21 KiB
PHP
<?php
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/**
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* Phergie
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*
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* PHP version 5
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.
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* It is also available through the world-wide-web at this URL:
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* http://phergie.org/license
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*
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* @category Phergie
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* @package Phergie_Plugin_Url
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* @author Phergie Development Team <team@phergie.org>
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* @copyright 2008-2010 Phergie Development Team (http://phergie.org)
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* @license http://phergie.org/license New BSD License
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* @link http://pear.phergie.org/package/Phergie_Plugin_Url
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*/
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/**
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* Monitors incoming messages for instances of URLs and responds with messages
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* containing relevant information about detected URLs.
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*
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* Has an utility method accessible via
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* $this->getPlugin('Url')->getTitle('http://foo..').
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*
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* @category Phergie
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* @package Phergie_Plugin_Url
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* @author Phergie Development Team <team@phergie.org>
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* @license http://phergie.org/license New BSD License
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* @link http://pear.phergie.org/package/Phergie_Plugin_Url
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* @uses Phergie_Plugin_Encoding pear.phergie.org
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* @uses Phergie_Plugin_Http pear.phergie.org
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* @uses Phergie_Plugin_Tld pear.phergie.org
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*/
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class Phergie_Plugin_Url extends Phergie_Plugin_Abstract
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{
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/**
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* Links output format
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*
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* Can use the variables %nick%, %title% and %link% in it to display
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* page titles and links
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*
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* @var string
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*/
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protected $baseFormat = '%message%';
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protected $messageFormat = '[ %link% ] %title%';
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/**
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* Flag indicating whether a single response should be sent for a single
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* message containing multiple links
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*
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* @var bool
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*/
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protected $mergeLinks = true;
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/**
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* Max length of the fetched URL title
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*
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* @var int
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*/
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protected $titleLength = 40;
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/**
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* Url cache to prevent spamming, especially with multiple bots on the
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* same channel
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*
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* @var array
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*/
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protected $urlCache = array();
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protected $shortCache = array();
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/**
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* Time in seconds to store the cached entries
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*
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* Setting it to 0 or below disables the cache expiration
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*
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* @var int
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*/
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protected $expire = 1800;
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/**
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* Number of entries to keep in the cache at one time per channel
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*
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* Setting it to 0 or below disables the cache limit
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*
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* @var int
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*/
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protected $limit = 10;
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/**
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* Flag that determines if the plugin will fall back to using an HTTP
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* stream when a URL using SSL is detected and OpenSSL support isn't
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* available in the PHP installation in use
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*
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* @var bool
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*/
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protected $sslFallback = true;
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/**
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* Flag that is set to true by the custom error handler if an HTTP error
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* code has been received
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*
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* @var boolean
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*/
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protected $errorStatus = false;
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protected $errorMessage = null;
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/**
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* Flag indicating whether or not to display error messages as the title
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* if a link posted encounters an error
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*
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* @var boolean
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*/
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protected $showErrors = true;
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/**
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* Flag indicating whether to detect schemeless URLS (i.e. "example.com")
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*
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* @var boolean
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*/
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protected $detectSchemeless = false;
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/**
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* Shortener object
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*/
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protected $shortener;
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/**
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* Array of renderers
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*/
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protected $renderers = array();
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/**
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* Checks for dependencies.
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*
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* @return void
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*/
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public function onLoad()
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{
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$plugins = $this->plugins;
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$plugins->getPlugin('Encoding');
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$plugins->getPlugin('Http');
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$plugins->getPlugin('Tld');
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// make the shortener configurable
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$shortener = $this->getConfig('url.shortener', 'Trim');
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$shortener = "Phergie_Plugin_Url_Shorten_{$shortener}";
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$this->shortener = new $shortener($this->plugins->getPlugin('Http'));
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if (!$this->shortener instanceof Phergie_Plugin_Url_Shorten_Abstract) {
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$this->fail("Declared shortener class {$shortener} is not of proper ancestry");
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}
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// load config (a bit ugly, but focusing on porting):
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foreach (
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array(
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'detect_schemeless' => 'detectSchemeless',
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'base_format' => 'baseFormat',
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'message_format' => 'messageFormat',
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'merge_links' => 'mergeLinks',
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'title_length' => 'titleLength',
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'show_errors' => 'showErrors',
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'expire' => 'expire',
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) as $config => $local) {
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if (isset($this->config["url.{$config}"])) {
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$this->$local = $this->config["uri.{$config}"];
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}
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}
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}
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/**
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* Checks an incoming message for the presence of a URL and, if one is
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* found, responds with its title if it is an HTML document and the
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* shortened equivalent of its original URL if it meets length requirements.
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*
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* @todo Update this to pull configuration settings from $this->config
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* rather than caching them as class properties
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* @return void
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*/
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public function onPrivmsg()
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{
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$this->handleMsg();
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}
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/**
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* Checks an incoming message for the presence of a URL and, if one is
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* found, responds with its title if it is an HTML document and the
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* shortened equivalent of its original URL if it meets length requirements.
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*
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* @todo Update this to pull configuration settings from $this->config
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* rather than caching them as class properties
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* @return void
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*/
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public function onAction()
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{
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$this->handleMsg();
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}
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/**
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* Handles message events and responds with url titles.
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*
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* @return void
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*/
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protected function handleMsg()
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{
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$source = $this->getEvent()->getSource();
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$user = $this->getEvent()->getNick();
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$responses = array();
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$urls = $this->findUrls($this->getEvent()->getArgument(1));
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foreach ($urls as $parsed) {
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$url = $parsed['glued'];
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// allow out-of-class renderers to handle this URL
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foreach ($this->renderers as $renderer) {
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if ($renderer->renderUrl($parsed) === true) {
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// renderers should return true if they've fully
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// rendered the passed URL (they're responsible
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// for their own output)
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$this->debug('Handled by renderer: ' . get_class($renderer));
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continue 2;
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}
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}
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// Convert url
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$shortenedUrl = $this->shortener->shorten($url);
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if (!$shortenedUrl) {
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$this->debug('Invalid Url: Unable to shorten. (' . $url . ')');
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$shortenedUrl = $url;
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}
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// Prevent spamfest
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if ($this->checkUrlCache($url, $shortenedUrl)) {
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$this->debug('Invalid Url: URL is in the cache. (' . $url . ')');
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continue;
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}
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$title = $this->getTitle($url);
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if (!empty($title)) {
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$responses[] = str_replace(
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array(
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'%title%',
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'%link%',
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'%nick%'
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), array(
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$title,
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$shortenedUrl,
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$user
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), $this->messageFormat
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);
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}
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// Update cache
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$this->updateUrlCache($url, $shortenedUrl);
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unset($title, $shortenedUrl, $title);
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}
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// Check to see if there were any URL responses, format them and handle if they
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// get merged into one message or not
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if (count($responses) > 0) {
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if ($this->mergeLinks) {
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$message = str_replace(
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array(
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'%message%',
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'%nick%'
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), array(
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implode('; ', $responses),
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$user
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), $this->baseFormat
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);
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$this->doPrivmsg($source, $message);
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} else {
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foreach ($responses as $response) {
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$message = str_replace(
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array(
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'%message%',
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'%nick%'
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), array(
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implode('; ', $responses),
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$user
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), $this->baseFormat
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);
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$this->doPrivmsg($source, $message);
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}
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}
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}
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}
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/**
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* Detect URLs in a given string.
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*
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* @param string $message the string to detect urls in
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*
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* @return array the array of urls found
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*/
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public function findUrls($message)
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{
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$pattern = '#'.($this->detectSchemeless ? '' : 'https?://').'(?:([0-9]{1,3}(?:\.[0-9]{1,3}){3})(?![^/]) | ('
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.($this->detectSchemeless ? '(?<!http:/|https:/)[@/\\\]' : '').')?(?:(?:[a-z0-9_-]+\.?)+\.[a-z0-9]{1,6}))[^\s]*#xis';
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$urls = array();
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// URL Match
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if (preg_match_all($pattern, $message, $matches, PREG_SET_ORDER)) {
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foreach ($matches as $m) {
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$url = trim(rtrim($m[0], ', ].?!;'));
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// Check to see if the URL was from an email address, is a directory, etc
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if (!empty($m[2])) {
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$this->debug('Invalid Url: URL is either an email or a directory path. (' . $url . ')');
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continue;
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}
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// Parse the given URL
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if (!$parsed = $this->parseUrl($url)) {
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$this->debug('Invalid Url: Could not parse the URL. (' . $url . ')');
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continue;
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}
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// Check to see if the given IP/Host is valid
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if (!empty($m[1]) and !$this->checkValidIP($m[1])) {
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$this->debug('Invalid Url: ' . $m[1] . ' is not a valid IP address. (' . $url . ')');
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continue;
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}
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// Process TLD if it's not an IP
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if (empty($m[1])) {
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// Get the TLD from the host
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$pos = strrpos($parsed['host'], '.');
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$parsed['tld'] = ($pos !== false ? substr($parsed['host'], ($pos+1)) : '');
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// Check to see if the URL has a valid TLD
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if ($this->plugins->tld->getTld($parsed['tld']) === false) {
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$this->debug('Invalid Url: ' . $parsed['tld'] . ' is not a supported TLD. (' . $url . ')');
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continue;
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}
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}
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// Check to see if the URL is to a secured site or not and handle it accordingly
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if ($parsed['scheme'] == 'https' && !extension_loaded('openssl')) {
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if (!$this->sslFallback) {
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$this->debug('Invalid Url: HTTPS is an invalid scheme, OpenSSL isn\'t available. (' . $url . ')');
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continue;
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} else {
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$parsed['scheme'] = 'http';
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}
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}
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if (!in_array($parsed['scheme'], array('http', 'https'))) {
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$this->debug('Invalid Url: ' . $parsed['scheme'] . ' is not a supported scheme. (' . $url . ')');
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continue;
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}
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$urls[] = $parsed + array('glued' => $this->glueURL($parsed));
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}
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}
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return $urls;
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}
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/**
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* Checks a given URL (+shortened) against the cache to verify if they were
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* previously posted on the channel.
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*
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* @param string $url The URL to check against
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* @param string $shortenedUrl The shortened URL to check against
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*
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* @return bool
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*/
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protected function checkUrlCache($url, $shortenedUrl)
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{
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$source = $this->getEvent()->getSource();
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/**
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* Transform the URL (+shortened) into a HEX CRC32 checksum to prevent potential problems
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* and minimize the size of the cache for less cache bloat.
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*/
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$url = $this->getUrlChecksum($url);
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$shortenedUrl = $this->getUrlChecksum($shortenedUrl);
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$cache = array(
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'url' => isset($this->urlCache[$source][$url]) ? $this->urlCache[$source][$url] : null,
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'shortened' => isset($this->shortCache[$source][$shortenedUrl]) ? $this->shortCache[$source][$shortenedUrl] : null
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);
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$expire = $this->expire;
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$this->debug("Cache expire: {$expire}");
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/**
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* If cache expiration is enabled, check to see if the given url has expired in the cache
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* If expire is disabled, simply check to see if the url is listed
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*/
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if (($expire > 0 && (($cache['url'] + $expire) > time() || ($cache['shortened'] + $expire) > time()))
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|| ($expire <= 0 && (isset($cache['url']) || isset($cache['shortened'])))
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) {
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unset($cache, $url, $shortenedUrl, $expire);
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return true;
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}
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unset($cache, $url, $shortenedUrl, $expire);
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return false;
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}
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/**
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* Updates the cache and adds the given URL (+shortened) to the cache. It
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* also handles cleaning the cache of old entries as well.
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*
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* @param string $url The URL to add to the cache
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* @param string $shortenedUrl The shortened to add to the cache
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*
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* @return bool
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*/
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protected function updateUrlCache($url, $shortenedUrl)
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{
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$source = $this->getEvent()->getSource();
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/**
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* Transform the URL (+shortened) into a HEX CRC32 checksum to prevent potential problems
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* and minimize the size of the cache for less cache bloat.
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*/
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$url = $this->getUrlChecksum($url);
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$shortenedUrl = $this->getUrlChecksum($shortenedUrl);
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$time = time();
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// Handle the URL cache and remove old entries that surpass the limit if enabled
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$this->urlCache[$source][$url] = $time;
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if ($this->limit > 0 && count($this->urlCache[$source]) > $this->limit) {
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asort($this->urlCache[$source], SORT_NUMERIC);
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array_shift($this->urlCache[$source]);
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}
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// Handle the shortened cache and remove old entries that surpass the limit if enabled
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$this->shortCache[$source][$shortenedUrl] = $time;
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if ($this->limit > 0 && count($this->shortCache[$source]) > $this->limit) {
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asort($this->shortCache[$source], SORT_NUMERIC);
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array_shift($this->shortCache[$source]);
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}
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unset($url, $shortenedUrl, $time);
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}
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/**
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* Transliterates a UTF-8 string into corresponding ASCII characters and
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* truncates and appends an ellipsis to the string if it exceeds a given
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* length.
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*
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* @param string $str String to decode
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* @param int $trim Maximum string length, optional
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*
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* @return string
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*/
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protected function decode($str, $trim = null)
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{
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$out = $this->plugins->encoding->transliterate($str);
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if ($trim > 0) {
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$out = substr($out, 0, $trim) . (strlen($out) > $trim ? '...' : '');
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}
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return $out;
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}
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/**
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* Takes a url, parses and cleans the URL without of all the junk
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* and then return the hex checksum of the url.
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*
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* @param string $url url to checksum
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*
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* @return string the hex checksum of the cleaned url
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*/
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protected function getUrlChecksum($url)
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{
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$checksum = strtolower(urldecode($this->glueUrl($url, true)));
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$checksum = preg_replace('#\s#', '', $this->plugins->encoding->transliterate($checksum));
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return dechex(crc32($checksum));
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}
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/**
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* Parses a given URI and procceses the output to remove redundant
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* or missing values.
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*
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* @param string $url the url to parse
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*
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* @return array the url components
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*/
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protected function parseUrl($url)
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{
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if (is_array($url)) return $url;
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$url = trim(ltrim($url, ' /@\\'));
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if (!preg_match('&^(?:([a-z][-+.a-z0-9]*):)&xis', $url, $matches)) {
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$url = 'http://' . $url;
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}
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$parsed = parse_url($url);
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if (!isset($parsed['scheme'])) {
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$parsed['scheme'] = 'http';
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}
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$parsed['scheme'] = strtolower($parsed['scheme']);
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if (isset($parsed['path']) && !isset($parsed['host'])) {
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$host = $parsed['path'];
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$path = '';
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if (strpos($parsed['path'], '/') !== false) {
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list($host, $path) = array_pad(explode('/', $parsed['path'], 2), 2, null);
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}
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$parsed['host'] = $host;
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$parsed['path'] = $path;
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}
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return $parsed;
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}
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/**
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* Parses a given URI and then glues it back together in the proper format.
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* If base is set, then it chops off the scheme, user and pass and fragment
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* information to return a more unique base URI.
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*
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* @param string $uri uri to rebuild
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* @param string $base set to true to only return the base components
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*
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* @return string the rebuilt uri
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*/
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protected function glueUrl($uri, $base = false)
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{
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$parsed = $uri;
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if (!is_array($parsed)) {
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$parsed = $this->parseUrl($parsed);
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}
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if (is_array($parsed)) {
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$uri = '';
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if (!$base) {
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$uri .= (!empty($parsed['scheme']) ? $parsed['scheme'] . ':' .
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((strtolower($parsed['scheme']) == 'mailto') ? '' : '//') : '');
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$uri .= (!empty($parsed['user']) ? $parsed['user'] .
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|
(!empty($parsed['pass']) ? ':' . $parsed['pass'] : '') . '@' : '');
|
|
}
|
|
if ($base && !empty($parsed['host'])) {
|
|
$parsed['host'] = trim($parsed['host']);
|
|
if (substr($parsed['host'], 0, 4) == 'www.') {
|
|
$parsed['host'] = substr($parsed['host'], 4);
|
|
}
|
|
}
|
|
$uri .= (!empty($parsed['host']) ? $parsed['host'] : '');
|
|
if (!empty($parsed['port'])
|
|
&& (($parsed['scheme'] == 'http' && $parsed['port'] == 80)
|
|
|| ($parsed['scheme'] == 'https' && $parsed['port'] == 443))
|
|
) {
|
|
unset($parsed['port']);
|
|
}
|
|
$uri .= (!empty($parsed['port']) ? ':' . $parsed['port'] : '');
|
|
if (!empty($parsed['path']) && (!$base || $base && $parsed['path'] != '/')) {
|
|
$uri .= (substr($parsed['path'], 0, 1) == '/') ? $parsed['path'] : ('/' . $parsed['path']);
|
|
}
|
|
$uri .= (!empty($parsed['query']) ? '?' . $parsed['query'] : '');
|
|
if (!$base) {
|
|
$uri .= (!empty($parsed['fragment']) ? '#' . $parsed['fragment'] : '');
|
|
}
|
|
}
|
|
return $uri;
|
|
}
|
|
|
|
/**
|
|
* Checks the given string to see if its a valid IP4 address
|
|
*
|
|
* @param string $ip the ip to validate
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function checkValidIP($ip)
|
|
{
|
|
return long2ip(ip2long($ip)) === $ip;
|
|
}
|
|
|
|
/**
|
|
* Returns the title of the given page
|
|
*
|
|
* @param string $url url to the page
|
|
*
|
|
* @return string title
|
|
*/
|
|
public function getTitle($url)
|
|
{
|
|
$http = $this->plugins->getPlugin('Http');
|
|
$options = array(
|
|
'timeout' => 3.5,
|
|
'user_agent' => 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.12) Gecko/20080201 Firefox/2.0.0.12'
|
|
);
|
|
|
|
$response = $http->head($url, array(), $options);
|
|
$header = $response->getHeaders('Content-Type');
|
|
|
|
if (!preg_match('#^(text/x?html|application/xhtml+xml)(?:;.*)?$#', $header)) {
|
|
$title = $header;
|
|
} else {
|
|
$response = $http->get($url, array(), $options);
|
|
$content = $response->getContent();
|
|
if (preg_match('#<title[^>]*>(.*?)</title>#is', $content, $match)) {
|
|
$title = preg_replace('/[\s\v]+/', ' ', trim($match[1]));
|
|
}
|
|
}
|
|
$encoding = $this->plugins->getPlugin('Encoding');
|
|
$title = $encoding->decodeEntities($title);
|
|
|
|
if (empty($title)) {
|
|
if ($response->isError()) {
|
|
$title = $response->getCodeAsString();
|
|
} else {
|
|
$title = 'No Title';
|
|
}
|
|
}
|
|
|
|
return $title;
|
|
}
|
|
|
|
/**
|
|
* Output a debug message
|
|
*
|
|
* @param string $msg the message to output
|
|
*
|
|
* @return void
|
|
*/
|
|
protected function debug($msg)
|
|
{
|
|
echo "(DEBUG:Url) $msg\n";
|
|
}
|
|
|
|
/**
|
|
* Add a renderer to the stack
|
|
*
|
|
* @param object $obj the renderer to add
|
|
*
|
|
* @return void
|
|
*/
|
|
public function registerRenderer($obj)
|
|
{
|
|
$this->renderers[spl_object_hash($obj)] = $obj;
|
|
}
|
|
}
|