/twitter.php

<?php



/*

Plugin Name: Simple Twitter for Wordpress

Version: 1.0

Plugin URI: http://www.twitter.com/jrcryer

Description: Displays your public Twitter messages for all to read.

Author: James Cryer

Author URI: http://www.twitter.com/jrcryer

*/

define('MAGPIE_CACHE_ON', 1); //2.7 Cache Bug

define('MAGPIE_CACHE_AGE', 180);

define('MAGPIE_INPUT_ENCODING', 'UTF-8');

define('MAGPIE_OUTPUT_ENCODING', 'UTF-8');



class TwitterFeed {



    public function __contruct() {}



    /**

     * Extracts the feed items from Twitter

     *

     * @param string $username

     * @param integer $feedItemsNum

     * @param bool $encode

     * @param bool $extractLinks

     * @param bool $extractUsers

     * @return array

     */

    public function getFeedItems($username, $feedItemsNum = 5, $encode = true, $extractLinks = true, $extractUsers = true) {

        $aMessage = $this->getTwitterMessages($username, $feedItemsNum);



        if(empty($aMessage)) {

            return array();

        }

        $aMessage = $this->parseMessages($aMessage, $encode, $extractLinks, $extractUsers);

        return $aMessage;

    }

    

    /**

     * Returns the messages from the supplied users limited by the number

     * of items to display

     *

     * @param string $username

     * @param int $num

     * @return array

     */

    protected function getTwitterMessages($username, $num = 5) {

        include_once(ABSPATH . WPINC . '/rss.php');

        $aMessage = fetch_rss('http://api.twitter.com/1/statuses/user_timeline/'.$username.'.rss');



        if(empty($aMessage)) {

            return array();

        }

        $aMessage = array_slice($aMessage->items, 0, $num);

        return $aMessage;

    }



    /**

     * Encodes all message content with UTF-8 encoding

     *

     * @param array $aMessage

     * @return array

     */

    protected function parseMessages($aMessage, $encode, $extractLinks, $extractUsers) {

        $aParsedMsg = array();



        foreach($aMessage as $item) {

            $content = " ".substr(strstr($item['description'],': '), 2, strlen($item['description']))." ";



            if($encode) {

                $content = utf8_encode($content);

            }



            if($extractLinks) {

                $content = $this->extractHyperlinks($content);

            }



            if($extractUsers) {

                $content = $this->extractUsers($content);

            }

            $item['description'] = $content;

            $item['date-posted'] = $this->getMessageTimestamp($item['pubdate']);

            $aParsedMsg[] = $item;

        }

        return $aParsedMsg;

    }



    /**

     * Returns the message time stamp based on the publishDate

     *

     * @param int $publishDate

     * @return string

     */

    protected function getMessageTimestamp($publishDate) {



        $h_time      = null;

        $time        = strtotime($publishDate);

        if ( ( abs( time() - $time) ) < 86400 ) {

            $h_time = sprintf( __('%s ago'), human_time_diff( $time ) );

        }else {

            $h_time = date(__('Y/m/d'), $time);

        }

        return sprintf( __('%s', 'twitter-for-wordpress'),' <span class="twitter-timestamp"><abbr title="' . date(__('Y/m/d H:i:s'), $time) . '">' . $h_time . '</abbr></span>' );

    }



    /**

     * Extract the links from the messages

     *

     * @param string $text

     * @return string

     */

    private function extractHyperlinks($text) {

        // Props to Allen Shaw & webmancers.com

        // match protocol://address/path/file.extension?some=variable&another=asf%

        //$text = preg_replace("/\b([a-zA-Z]+:\/\/[a-z][a-z0-9\_\.\-]*[a-z]{2,6}[a-zA-Z0-9\/\*\-\?\&\%]*)\b/i","<a href=\"$1\" class=\"twitter-link\">$1</a>", $text);

        $text = preg_replace('/\b([a-zA-Z]+:\/\/[\w_.\-]+\.[a-zA-Z]{2,6}[\/\w\-~.?=&%#+$*!]*)\b/i',"<a href=\"$1\" class=\"twitter-link\">$1</a>", $text);

        // match www.something.domain/path/file.extension?some=variable&another=asf%

        //$text = preg_replace("/\b(www\.[a-z][a-z0-9\_\.\-]*[a-z]{2,6}[a-zA-Z0-9\/\*\-\?\&\%]*)\b/i","<a href=\"http://$1\" class=\"twitter-link\">$1</a>", $text);

        $text = preg_replace('/\b(?<!:\/\/)(www\.[\w_.\-]+\.[a-zA-Z]{2,6}[\/\w\-~.?=&%#+$*!]*)\b/i',"<a href=\"http://$1\" class=\"twitter-link\">$1</a>", $text);



        // match name@address

        $text = preg_replace("/\b([a-zA-Z][a-zA-Z0-9\_\.\-]*[a-zA-Z]*\@[a-zA-Z][a-zA-Z0-9\_\.\-]*[a-zA-Z]{2,6})\b/i","<a href=\"mailto://$1\" class=\"twitter-link\">$1</a>", $text);

        //mach #trendingtopics. Props to Michael Voigt

        $text = preg_replace('/([\.|\,|\:|\�|\�|\>|\{|\(]?)#{1}(\w*)([\.|\,|\:|\!|\?|\>|\}|\)]?)\s/i', "$1<a href=\"http://twitter.com/#search?q=$2\" class=\"twitter-link\">#$2</a>$3 ", $text);

        return $text;

    }



    /**

     * Extract the user from the messages

     *

     * @param string $text

     * @return string

     */

    private function extractUsers($text) {

        $text = preg_replace('/([\.|\,|\:|\�|\�|\>|\{|\(]?)@{1}(\w*)([\.|\,|\:|\!|\?|\>|\}|\)]?)\s/i', "$1<a href=\"http://twitter.com/$2\" class=\"twitter-user\">@$2</a>$3 ", $text);

        return $text;

    }

}



class TwitterWidget extends WP_Widget {



    public function TwitterWidget() {

        parent::WP_Widget(false, $name = 'TwitterWidget');

    }



    public function form($instance) {

        $title          = esc_attr($instance['title']);

        $username       = esc_attr($instance['username']);

        $number         = esc_attr($instance['num']);

        $update         = esc_attr($instance['update']);

        $linked         = esc_attr($instance['linked']);

        $hyperlinks     = esc_attr($instance['hyperlinks']);

        $twitter_users  = esc_attr($instance['twitter_users']);

        $encode         = esc_attr($instance['encode_utf8']);



        ?>

        <p>

            <label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:'); ?>

                <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo $title; ?>" />

            </label>

        </p>

        <p>

            <label for="<?php echo $this->get_field_id('username'); ?>"><?php _e('Twitter username:'); ?>

                <input class="widefat" id="<?php echo $this->get_field_id('username'); ?>" name="<?php echo $this->get_field_name('username'); ?>" type="text" value="<?php echo $username; ?>" />

            </label>

        </p>

        <p>

            <label for="<?php echo $this->get_field_id('num'); ?>"><?php _e('Number of tweets:'); ?>

                <input class="widefat" id="<?php echo $this->get_field_id('num'); ?>" name="<?php echo $this->get_field_name('num'); ?>" type="text" value="<?php echo $number; ?>" />

            </label>

        </p>

        <p>

            <label for="<?php echo $this->get_field_id('update'); ?>"><?php _e('Show date posted:'); ?>

                <input id="<?php echo $this->get_field_id('update'); ?>" name="<?php echo $this->get_field_name('update'); ?>" type="checkbox" <?php echo $update? 'checked="chcked"' : ''; ?> />

            </label>

        </p>

        <p>

            <label for="<?php echo $this->get_field_id('hyperlinks'); ?>"><?php _e('Discover hyperlinks:'); ?>

                <input id="<?php echo $this->get_field_id('hyperlinks'); ?>" name="<?php echo $this->get_field_name('hyperlinks'); ?>" type="checkbox" <?php echo $hyperlinks ? 'checked="checked"' : ''; ?> />

            </label>

        </p>

        <p>

            <label for="<?php echo $this->get_field_id('twitter_users'); ?>"><?php _e('Discover @replies:'); ?>

                <input id="<?php echo $this->get_field_id('twitter_users'); ?>" name="<?php echo $this->get_field_name('twitter_users'); ?>" type="checkbox" <?php echo $twitter_users ? 'checked="checked"' : ''; ?> />

            </label>

        </p>

        <p>

            <label for="<?php echo $this->get_field_id('encode_utf8'); ?>"><?php _e('UTF8 Encode:'); ?>

                <input id="<?php echo $this->get_field_id('encode_utf8'); ?>" name="<?php echo $this->get_field_name('encode_utf8'); ?>" type="checkbox" <?php echo $encode ? 'checked="checked"' : ''; ?> />

            </label>

        </p>

        <?php

    }



    /**

     * Update a widget values

     *

     * @param array $new_instance

     * @param array $old_instance

     * @return array

     */

    public function update($new_instance, $old_instance) {

        $instance = $old_instance;

	$instance['title']         = strip_tags($new_instance['title']);

        $instance['username']      = strip_tags($new_instance['username']);

        $instance['num']           = strip_tags($new_instance['num']);

        $instance['update']        = strip_tags($new_instance['update']);

        $instance['linked']        = strip_tags($new_instance['linked']);

        $instance['hyperlinks']    = strip_tags($new_instance['hyperlinks']);

        $instance['twitter_users'] = strip_tags($new_instance['twitter_users']);

        $instance['encode_utf8']   = strip_tags($new_instance['encode_utf8']);

        return $instance;

    }



    /**

     * Process the widget and output the content

     * 

     * @param array $args

     * @param array $instance

     * @return string

     */

    public function widget($args, $instance) {

        extract($args);



        $username               = $instance['username'];

        $num                    = $instance['num'];

        $list                   = $instance['list'];

        $update                 = $instance['update'];

        $linked                 = $instance['linked'];

        $extractLinks           = $instance['hyperlinks'];

        $extractUsers           = $instance['twitter_users'];

        $encode                 = $instance['utf8_encode'];



        if(empty($username)) {

            return false;

        }

        $oFeed    = new TwitterFeed();

        $aMessage = $oFeed->getFeedItems($username, $num, $encode, $extractLinks, $extractUsers);

        $content  = empty($aMessage) ?

                    '<p class="notice">There are no public messages.</p>' :

                    $this->generateMessageOutput($aMessage, $update);

        

        echo sprintf(

            "%s%s%s%s%s",

            $before_widget,

                $before_title,

                    $this->getTitle($instance),

                $after_title,

                $content,

            $after_widget

        );

    }



    /**

     * Returns the HTML for the title of the widget

     * 

     * @param array $instance

     * @return string

     */

    protected function getTitle($instance) {

        $title    = apply_filters('widget_title', $instance['title']);

        $username = $instance['username'];

        return sprintf(

            '<a class="twitter-title" href="http://twitter.com/%1$s" class="twitter_title_link">%2$s</a>'.

            '<a class="twitter-icon" href="http://www.twitter.com/%1$s"><img src="http://twitter-badges.s3.amazonaws.com/t_small-b.png" alt="Follow jrcryer on Twitter"/></a>',

            $username, $title

        );       

    }



    /**

     * Generates HTML list of feed items

     *

     * @param arrray $aMessage

     * @param bool $update

     * @return string

     */

    protected function generateMessageOutput($aMessage, $update = true) {

        

        $output = '<ul class="twitter">';



        foreach ( $aMessage as $item ) {

            $content  = $item['description'];

            $link     = $item['link'];



            $output .= sprintf(

                '<li class="twitter-item">%s%s</li>',

                $content,

                $update ? sprintf('<a href="%s" class="twitter-link">%s</a>', $link, $item['date-posted']) : ''

            );

        }

        $output .= '</ul>';

        return $output;

    }

}

add_action('widgets_init', create_function('', 'return register_widget("TwitterWidget");'));