external_comments.php

<?php
/*
Plugin Name: External Comments
Description: Provides external comments support on pages supporting:
- Disqus 
- IntenseDebate
- Livefyre
- Facebook connect

*Can optionally override the page information so this call can be used
in external plugins like the News manager.
*Supports i18n language files
*Russian and German translations provided (Thanks Oleg and Connie)

Version: 0.9
Author: Rob Antonishen
Author URI: http://ffaat.poweredbyclear.com/
*/

# get correct id for plugin
$thisfile=basename(__FILE__, '.php');

#load internationalzation
i18n_merge('external_comments') || i18n_merge('external_comments','en_US');

# register plugin
register_plugin(
    $thisfile, 
    'External Comments',     
    '0.9',         
    'Rob Antonishen',
    'http://ffaat.poweredbyclear.com', 
    'Provides external comments support',
    'plugins',
    'external_comments_config'  
);

# global vars
$external_comments_conf = external_comments_loadconf();

# activate filter
add_filter('content','external_comments_display'); 

add_action('plugins-sidebar','createSideMenu',array($thisfile,'External Comments'));
add_action('theme-header','external_comments_header',array());

/* Inject meta code for facebook admin and VK into header as necessary */
function external_comments_header() {
  global $external_comments_conf, $data_index;

  if (strpos($data_index->content, '(% external_comments %)') !== false && $external_comments_conf['provider'] == 'facebook') {
    echo '<meta property="fb:admins" content="' . $external_comments_conf['shortname'] . '" />'."\n";
  }
  
  if (strpos($data_index->content, '(% external_comments %)') !== false && $external_comments_conf['provider'] == 'vk') {
    echo '<script src="http://userapi.com/js/api/openapi.js" type="text/javascript" charset="windows-1251"></script>'."\n";
  }
}

/* frontend content replacement */
function external_comments_display($contents) {
  $tmp_content = $contents;
  $location = stripos($tmp_content, '(% external_comments %)');
      
  if ($location !== FALSE) {
    $tmp_content = str_replace('(% external_comments %)','',$tmp_content);
    $start_content = substr($tmp_content, 0 ,$location);
    $end_content = substr($tmp_content, $location, strlen($tmp_content)-$location );
    
    $tmp_content = $start_content . return_external_comments() . $end_content;
  }
  // build page
  return $tmp_content;
}

/* echo the comment page code for use in templates */
function get_external_comments($PostID='', $PageURL='', $PageTitle='') {
  echo return_external_comments($PostID, $PageURL, $PageTitle);
}

/* returns the appropriate page code */
function return_external_comments($PostID='', $PageURL='', $PageTitle='') {
  global $external_comments_conf;

  if ($PostID=='') {
    $PostID=return_page_slug();
  }
  if ($PageURL=='') {
    $PageURL=get_page_url(True);
  }
  if ($PageTitle=='') {
    $PageTitle=return_page_title();
  }
  $PostID = addslashes($PostID);
  $PageURL = addslashes($PageURL);
  $PageTitle = addslashes($PageTitle);
  
  $new_content = "\n<!-- START: external_coments plugin embed code -->\n";  
    
  switch ($external_comments_conf['provider']) {
    case 'Disqus':    
      $new_content .= '<div id="disqus_thread"></div>';
      $new_content .= '<script type="text/javascript">';
      $new_content .= "var disqus_shortname = '" . $external_comments_conf['shortname'] . "';"; 
      $new_content .= "var disqus_developer = '" . $external_comments_conf['developer'] . "';"; 
      $new_content .= "var disqus_identifier = '" . $PostID . "';";
      $new_content .= "var disqus_url = '" . $PageURL . "';";
      $new_content .= "var disqus_title = '" . $PageTitle . "';";
      $new_content .= <<<INLINECODE
    (function() {
        var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
        dsq.src = 'http://' + disqus_shortname + '.disqus.com/embed.js';
        (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
    })();
</script>
<noscript>Please enable JavaScript to view the <a href="http://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript>
<a href="http://disqus.com" class="dsq-brlink">blog comments powered by <span class="logo-disqus">Disqus</span></a>
INLINECODE;
      break;
    
    case 'ID':
      $new_content .= '<script>';
      $new_content .= "var idcomments_acct = '" . $external_comments_conf['shortname'] . "';";
      $new_content .= "var idcomments_post_id = '" . $PostID . "';";
      $new_content .= "var idcomments_post_url = '" . $PageURL . "';";
      $new_content .= "</script>";
      $new_content .= '<span id="IDCommentsPostTitle" style="display:none"></span>';
      $new_content .= "<script type='text/javascript' src='http://www.intensedebate.com/js/genericCommentWrapperV2.js'></script>";
      break;

    case 'livefyre':
      $new_content .= "<script type='text/javascript' src='http://livefyre.com/wjs/javascripts/livefyre.js'></script>";
      $new_content .= "<script type='text/javascript'>var fyre = LF({site_id: " . $external_comments_conf['shortname'];
      $new_content .= ", article_id: '" . $PostID . "', version: '1.0' }); </script>";
      break;

    case 'vk':
      $new_content .= "<script type='text/javascript'>VK.init({apiId: " . $external_comments_conf['shortname'] . ", onlyWidgets: true });</script>";
      $new_content .= "<div id='vk_comments'></div>";
      $new_content .= "<script type='text/javascript'>VK.Widgets.Comments('vk_comments', {page_id: '" . $PostID . "'}); </script>";
      break;
      
    case 'facebook':
      $new_content .= '<div id="fb-root"></div>';
      $new_content .= '<script src="http://connect.facebook.net/en_US/all.js#appId=APP_ID&amp;xfbml=1"></script>';
      $new_content .= '<fb:comments href="' . $PageURL . '" num_posts="" width=""></fb:comments>';
      break;      
  }

  $new_content .= "\n<!-- END: external_coments plugin embed code -->\n";  

  return $new_content;
}


/* backend management page */
function external_comments_config() {
  global $external_comments_conf;
  
  if (isset($_POST) && sizeof($_POST)>0) {
    /* Save Settings */
    if (isset($_POST['developer'])) {
      $external_comments_conf['developer'] = 1;
    } else {
      $external_comments_conf['developer'] = 0;
    }
    if (isset($_POST['shortname'])) {
      $external_comments_conf['shortname'] = $_POST['shortname'];
    }
    if (isset($_POST['provider'])) {
      $external_comments_conf['provider'] = $_POST['provider'];
    }
    external_comments_saveconf();
    echo '<div style="display: block;" class="updated">' . i18n_r('external_comments/MSG_UPDATED') . '.</div>';
  }

  echo '<h3 class="floated">' . i18n_r('external_comments/PLUGINTITLE') . '</h3><br/><br/>';
  echo '<form name="settings" action="load.php?id=external_comments" method="post">';
  
  echo '<label>' . i18n_r('external_comments/LBL_SERVICE') . ':</label><p>';
  
  echo '<select name="provider" onChange="settings.submit();">';

  echo '<option value="Disqus"';
  if ($external_comments_conf['provider'] == 'Disqus') {
    echo ' selected="selected" ';
  }
  echo '>Disqus</option>';
  
  echo '<option value="ID"';
  if ($external_comments_conf['provider'] == 'ID') {
    echo ' selected="selected" ';
  }
  echo '>Intense Debate</option>';

  echo '<option value="livefyre"';
  if ($external_comments_conf['provider'] == 'livefyre') {
    echo ' selected="selected" ';
  }
  echo '>Livefyre</option>';

  echo '<option value="vk"';
  if ($external_comments_conf['provider'] == 'vk') {
    echo ' selected="selected" ';
  }
  echo '>VK</option>';

  echo '<option value="facebook"';
  if ($external_comments_conf['provider'] == 'facebook') {
    echo ' selected="selected" ';
  }
  echo '>Facebook Comments</option>';

  echo '</select>';
  
  echo '<br /><br />';
  
  switch ($external_comments_conf['provider']) {
    case 'Disqus':
      echo '<label>' . i18n_r('external_comments/LBL_DISQUSID') . ':</label>';
      echo '<input name="shortname" type="text" size="90" value="'.$external_comments_conf['shortname'] .'">';      
      echo '<p><input name="developer" type="checkbox" value="Y"';
      if ($external_comments_conf['developer'] == 1) {
        echo ' checked';
      }
      echo '>&nbsp; ' . i18n_r("external_comments/LBL_DISQUSDEV") . '</p><br />';
      break;
    
    case 'ID':
      echo '<label>' . i18n_r('external_comments/LBL_IDID') . ':</label>';
      echo '<input name="shortname" type="text" size="90" value="'.$external_comments_conf['shortname'] .'">';      
      break;
      
    case 'livefyre':
      echo '<label>' . i18n_r('external_comments/LBL_LIVEFYREID') . ':</label>';
      echo '<input name="shortname" type="text" size="90" value="'.$external_comments_conf['shortname'] .'">';      
      break;
      
    case 'vk':
      echo '<label>' . i18n_r('external_comments/LBL_VKID') . ':</label><p>';
      echo '<input name="shortname" type="text" size="90" value="'.$external_comments_conf['shortname'] .'">';      
      break;
      
    case 'facebook':
      echo '<label>' . i18n_r('external_comments/LBL_FACEBOOKID') . ':</label>';
      echo '<input name="shortname" type="text" size="90" value="'.$external_comments_conf['shortname'] .'">';      
      break;
  }
      
  echo "<input name='submit_settings' class='submit' type='submit' value='" . i18n_r('external_comments/BTN_SAVE') . "'><br />";
  echo '</form>';
  echo '<br /><p><i>' . i18n_r('external_comments/PLUGINHELP') . '</i></p>';
}

/* get config settings from file */
function external_comments_loadconf() {
  $vals=array();
  $configfile=GSDATAOTHERPATH . 'external_comments.xml';
  if (!file_exists($configfile)) {
    //default settings
    $xml_root = new SimpleXMLElement('<settings><provider>Disqus</provider><developer>0</developer><shortname></shortname></settings>');
    if ($xml_root->asXML($configfile) === FALSE) {
	  exit(i18n_r('external_comments/MSG_SAVEERROR') . ' ' . $configfile . ', ' . i18n_r('external_comments/MSG_CHECKPRIV'));
    }
    if (defined('GSCHMOD')) {
	  chmod($configfile, GSCHMOD);
    } else {
      chmod($configfile, 0755);
    }
  }

  $xml_root = simplexml_load_file($configfile);
  
  if ($xml_root !== FALSE) {
    $node = $xml_root->children();
  
    $vals['provider'] = (string)$node->provider;
    $vals['developer'] = (int)$node->developer;
    $vals['shortname'] = (string)$node->shortname;
  }
  return($vals);
}

/* save config settings to file*/
function external_comments_saveconf() {
  global $external_comments_conf;
  $configfile=GSDATAOTHERPATH . 'external_comments.xml';

  $xml_root = new SimpleXMLElement('<settings></settings>');
  $xml_root->addchild('provider', $external_comments_conf['provider']);
  $xml_root->addchild('developer', $external_comments_conf['developer']);
  $xml_root->addchild('shortname', $external_comments_conf['shortname']);
  
  if ($xml_root->asXML($configfile) === FALSE) {
	exit(i18n_r('external_comments/MSG_SAVEERROR') . ' ' . $configfile . ', ' . i18n_r('external_comments/MSG_CHECKPRIV'));
  }
}
?>