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contributions/api.twitter/lib/helpers/converters/twitter.converter.php

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<?php
require_once GYRO_CORE_DIR . 'lib/helpers/converters/html.converter.php';

/**
 * Converte a twitter message into HTML
 * 
 * Replaces hashes with <b>..</b>, user (@..) by <i>..</i>
 * and links by an anchor tag
 * 
 * Optionally, if ConverterTwitter::EXPAND_LINKS is passed as parameter,
 * The component will try to resolve redirect services like bit.ly et al,
 * replacing the url in the message with the resolving one.
 * 
 * @ingroup Twitter
 * @author Gerd Riesselmann
 */
class ConverterTwitter implements IConverter {
        const EXPAND_LINKS = 1024;
        
        public function encode($value, $params = false) {
                $value = String::escape($this->decode($value));
                // Try to find hash tags and make them bold
                $search = '@(\s#[\S]*)@';
                $replace = ' <b>$1</b>';
                $value = String::preg_replace($search, $replace, $value);

                // Try to find users and make them italic
                $search = '|(@[\S]*)|';
                $replace = '<i>$1</i>';
                $value = String::preg_replace($search, $replace, $value);
                        
                // Replace URLS
                $search = "@(http[s]?://[\S]*)@";
                
                if (Common::flag_is_set($params, self::EXPAND_LINKS)) {
                        // FInd them to check for bit.ly et al
                        $matches = array();
                        String::preg_match_all($search, $value, $matches);
                        
                        Load::components('httprequest');
                        $err = new Status();
                        foreach (Arr::get_item($matches, 0, array()) as $url) {
                                $head = HttpRequest::get_head($url, $err);
                                // Look for a location header element
                                $search_loc = '@location: ([\S]*)@i';
                                $matches_loc = array();
                                if (String::preg_match_all($search_loc, $head, $matches_loc)) {
                                        // Get last redirect
                                        $new_url = String::escape(array_pop($matches_loc[1]));
                                        $value = str_replace($url, $new_url, $value);   
                                }                       
                        }
                }
                
                $replace =  '<a href="$1">$1</a>';
                $value = String::preg_replace($search, $replace, $value);
                
                return $value;
        }


        public function decode($value, $params = false) {
                $value = str_replace('&gt;', ">", $value);
                $value = str_replace('&lt;', "<", $value);
                return trim($value);            
        }               
}

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