dc_pixelaccess.module

<?php

/**
 * @file
 * Pixel access counter
 */

/**
 * Implementation of hook_menu().
 */
function dc_pixelaccess_menu() {
	$items = array();
	$items['ajax/dc_pixelaccess_stats.php'] = array(
		'page callback' => 'dc_pixelaccess_ajax_callback',
		'type' => MENU_CALLBACK,
		'access callback' => 1,
		'access arguments' => array('access content'),
		'file path' => drupal_get_path('module', 'dc_pixelaccess'),
		'file' => 'dc_pixelaccess.ajax.inc'
	);
	return $items;
}

/**
 * Implementation of hook_block().
 */
function dc_pixelaccess_block($op = 'list', $delta = 0, $edit = array()) {
	global $user;

	switch ($op) {
		case 'list':
			$blocks['dc-pixelaccess-count'] = array(
				'info'   => t('DrupalCONCEPT: AJAX core statistics'),
				'weight' => 10,
				'cache'  => BLOCK_NO_CACHE,
			);
			return $blocks;
		case 'view':
			//dpm($_SERVER);
			if (!( strpos($_SERVER['SCRIPT_FILENAME'], 'index.php') === FALSE
				|| variable_get('site_offline', 0)
				|| ($_SERVER['REQUEST_METHOD'] != 'GET' && $_SERVER['REQUEST_METHOD'] != 'HEAD')
				|| $_SERVER['SERVER_SOFTWARE'] === 'PHP CLI'
				|| isset($_GET['nocache'])
				|| !empty($user->uid)
				|| !module_exists('statistics')
			)) {
				$block = array();
				$block['subject'] = t('DrupalCONCEPT Pixelaccess counter');
				$block['content'] .= '<div id="dc_pixelaccess-stats"></div>' . dc_pixelaccess_stats_generate("ajax/dc_pixelaccess_stats.php");
			}
			else {
				$block['content'] .= '<div id="dc_pixelaccess-stats"></div>';
				drupal_add_js('$("#dc_pixelaccess-stats").parent().parent().hide();', 'inline', 'footer');
			}
			break;
	}
	return $block;
}


/**
 * Generate js/html for DC pixelaccess stat counter.
 *
 * NOTE HTML code could be added to the $buffer directly. Would prevent 2x
 * counts on first view. Would be hard to do though.
 *
 * @param $filename
 *   Name of pixelaccess's statistics php file.
 */
function dc_pixelaccess_stats_generate($filename) {
  global $base_path;

  // is node & node count enabled.
  if (arg(0) == 'node' && is_numeric(arg(1)) && arg(2) == '' && variable_get('statistics_count_content_views', 0)) {
    $nid = arg(1);;
  }
  else {
    $nid = 'NULL';
  }

  // access log enabled.
  if ((variable_get('statistics_enable_access_log', 0)) && (module_invoke('throttle', 'status') == 0)) {
    $title = drupal_urlencode(strip_tags(drupal_get_title()));
    $q = $_GET['q'];
  }
  else {
    $title = 'NULL';
    $q = 'NULL';
  }

  $page_js = array(
    'dc_pixelaccess' => array(
      'nid' => $nid,
      'q' => $q,
      'title' => $title,
    ),
  );
  $site_js = <<<ETO
$.getJSON(Drupal.settings.basePath + "$filename", {nocache: "1", js: "1", nid: Drupal.settings.dc_pixelaccess.nid, qq: Drupal.settings.dc_pixelaccess.q, title: Drupal.settings.dc_pixelaccess.title, referer: document.referrer}, function(response) {
  $.each(response, function(id, contents) {
    if (contents == 'NULL') {
      $(id).parent().parent().hide();
    }
    else {
      $(id).html(contents);
    }
  });
});
ETO;

  // page specific variables
  drupal_add_js($page_js, 'setting', 'header');
  // site-wide code
  drupal_add_js($site_js, 'inline', 'footer');
  // no script code
  $page_ns = '<noscript><div style="display:inline;"><img src="' . $base_path . $filename . '?nocache=1' . '&nid='. $nid . '&title='. $title . '&q='. $q . '" alt="" /></div></noscript>';

  return $page_ns;
}




/**
 * Output text & set php in async mode.
 *
 * @param $output
 *  string - Text to output to open connection.
 * @param $wait
 *  bool - Wait 1 second?
 * @param $content_type
 *  string - Content type header.
 */
function dc_pixelaccess_async_opp($output, $wait = TRUE, $content_type = "text/html; charset=utf-8", $length = 0) {
  // Calculate Content Lenght
  if ($length == 0) {
    $output .= "\n";
    $length = (mb_strlen($output, '8bit')-1);
  }
  // Prime php for background operations
  $loop = 0;
  while (ob_get_level() && $loop < 25) {
    ob_end_clean();
    $loop++;
  }
  header("Connection: close");
  ignore_user_abort();

  // Output headers & data
  ob_start();
  header("Content-type: " . $content_type);
  header("Expires: Sun, 19 Nov 1978 05:00:00 GMT");
  header("Cache-Control: no-cache");
  header("Cache-Control: must-revalidate");
  header("Content-Length: " . $length);
  header("Connection: close");
  print($output);
  ob_end_flush();
  flush();
  // wait for 5 milliseconds
  if ($wait) {
    usleep(5000);
  }

  // text returned and connection closed.
  // Do background processing. Time taken after should not effect page load times.
}