remote_block.module

<?php
// $Id$

/** 
* Implements hook_help()
*/
function remote_block_help($path, $arg) {
  $output = '';
  switch($path) {
    case 'admin/help#remote_block':
    $output = '<p>' . t('Remote Block renders blocks on a regionless page so that they may be embedded via an iframe. You may use the embed code it generates to embed any given block on a site. Note that required CSS and JS will be included, so blocks with special styles and behaviors (such as Quicktabs blocks) will still function.') . '</p>';
    $output .= '<p>' . t('Remote Block can also provide the same content via JSON for more advanced embeds. See the examples/json-demo.html file to see how it works.') . '</p>';
    $output .= '<p>' . t('Finally, Remote Block can display bare HTML if the ?theme=none query string is appended to the URL. This is useful when using wget to grab raw HTML for use in external sites.') . '</p>';
    break;
    }
  return $output;
}

/**
 * Implements hook_menu().
 */
function remote_block_menu() {
  $items = array();

  $items['remote-block/%/%/%'] = array(
    'page callback' => 'remote_block_embed',
    'page arguments' => array(1, 2, 3),
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );

  return $items;
}

/**
 * Implements hook_block().
 * Provides a block that shows the embed code for the "My City" page.
*/
function remote_block_block($op = 'list', $delta = 0) {
  $block = array();
  switch ($op) {
    case 'list':
      $block[0]['info'] = t('My City Embed Code');
      return $block;
    case 'view':
      switch ($delta) {
        case 0:
          $block['subject'] = t('Embed This Page');
          $block['content'] = remote_block_embed_code();
          break;
      }
      return $block;
  }
}

/** 
 * Content for the embed code block.
*/
function remote_block_embed_code() {
  return drupal_get_form('rb_embed_code_form');
}

/**
 * Form definition for the embed code block.
*/
function rb_embed_code_form() {
  $code = rb_get_city_embed_code();

  $form = array();
  $form['rb_embed_code'] = array(
    '#type' => 'fieldset',
    '#title' => t('Embed this page'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['rb_embed_code']['code'] = array(
    '#type' => 'textarea',
    '#title' => t('Embed code'),
    '#description' => t('Copy and paste this code into the &lt;body&gt; of your website\'s HTML'),
    '#value' => $code,
    '#maxlength' => FALSE,
  );
  return $form;
}

/**
 * Generates the embed code itself.
*/
function rb_get_city_embed_code() {
  if(arg(0) == "taxonomy" && arg(1) == "term" && is_numeric(arg(2))) {
    $term = taxonomy_get_term(arg(2));
    if(is_object($term)) {
      $embed_code = <<<EOF
<!-- begin TechMission ChristianVolunteering embed code for $term->name -->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" src="http://www.urbanministry.org/sites/all/modules/custom/remote_block/js/jquery.ba-postmessage.min.js"></script>
<script type="text/javascript">
$(function(){  
  var if_height,  
    src = 'http://www.urbanministry.org/remote-block/html/quicktabs/17/$term->tid#' + encodeURIComponent( document.location.href ),    
    iframe = $( '<iframe " src="' + src + '" width="600" height="50" scrolling="no" frameborder="0"><\/iframe>' )
      .appendTo( '#iframe' );  
  $.receiveMessage(function(e){    
    var h = Number( e.data.replace( /.*if_height=(\d+)(?:&|$)/, '$1' ) );    
    if ( !isNaN( h ) && h > 0 && h !== if_height ) {
      iframe.height( if_height = h );
    }    
  }, 'http://www.urbanministry.org' );
});
</script>
<div id="iframe"></div>
<!-- end embed code -->
EOF;
      return $embed_code;
    }
    else {
      return "No embed code available for the current term.";
    }
  }
  else {
    return "No embed code available.";
  }
}

/**
 * Menu callback for remote-block/%/%/% -
 * invokes the block view hook in order to render a certain block.
 */
function remote_block_embed($format, $module, $delta) {
  // Sets the variable to print without CSS and JS based on query string.
  $theme = TRUE;
  if(isset($_GET) && isset($_GET['theme']) && $_GET['theme'] == 'none') { $theme = FALSE; }

  // Loads the block content, or returns error if failure.
  if(isset($module) && module_exists($module) && isset($delta)) {
    $block = module_invoke($module, 'block', 'view', $delta);
  }
  else {
    print 'Invalid request.';
  }

  // Sets up the variables of $head, $css, $content, and $js.
  $head = drupal_get_html_head();
  $css = drupal_get_css();
  // Includes Quicktabs CSS if necessary.
  if($module == 'quicktabs') { 
    $css .= 
      '<style type="text/css">
         .quicktabs-hide {
          display: block;
          position: absolute;
          left: -10000px;
          top: -10000px;
         }
       </style>';
  }
  // If $format is "html" then add the JS for <iframe> window.postMessage.
  drupal_add_js(drupal_get_path('module', 'remote_block') . '/js/jquery.ba-postmessage.min.js');
  drupal_add_js(drupal_get_path('module', 'remote_block') . '/js/remote_block_child.js');
  // Adds JS at the bottom.
  $js = drupal_get_js();

  // Builds an entire HTML page for the HTML display format
  $content = '<!DOCTYPE html><html><head>' . $head . $css . '</head><body>' . $block['content'] . $js . '</body></html>';

  // Sets up variables for the JSON of the block, and JSON of block plus CSS/JS.
  $json_block = array('page' => $block['content']);
  // Sets up content array so page, css, and js can be added at specific points.
  $json_content = array('content' => $block['content'], 'css' => $css, 'js' => $js);
  
  if(isset($block) && is_array($block) && isset($block['content'])) { 
    if($theme == FALSE) {
      if($format == 'html') {
        print $block['content'];
      }
      elseif($format == 'json') {
        if(isset($_GET['callback'])) {
          $json_callback = $_GET['callback'];
        }
        else {
          $json_callback = '';
        }
        echo $json_callback . '(' . json_encode($json_block) . ');';
      }
      else {
        print 'Invalid format.';
      }
    }
    else {
      if($format == 'html') {
        print $content;
      }
      elseif($format == 'json') {
        if(isset($_GET['callback'])) {
          $json_callback = $_GET['callback'];
        }
        else {
          $json_callback = '';
        }
        echo $json_callback . '(' . json_encode($json_content) . ');';
      }
      else {
        print 'Invalid format.';
      }
    }
  }
}