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msng/ogp.php

Created December 7, 2011 05:38
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OGP Helper class file
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ogp.php
<?php
/**
* Ogp Helper class file
*
* Adds OGP elements in <head />
*
* Licensed under The MIT License
*
* @author Masunaga Ray (http://www.msng.info/)
* @link http://www.msng.info/archives/2011/12/cakephp-ogp-helper.php
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
class OgpHelper extends AppHelper
{
public $helpers = array('Html');
/**
* Decides whether or not each property should be taken automatically
*
* Works only when the property is not configured anywhere.
**/
public $autoGetUrl = true;
public $autoGetTitle = true;
public $autoGetSiteName = true;
public $autoGetLocale = true;
/**
* Names for configurations
**/
public $configName = 'OGP';
public $configLocaleName = 'OGPlocales';
public $varName = 'ogp_params';
/**
* Default values for OGP are read from this property,
* Configure::read['OGP'] and View variable $ogp_params (by default)
* and the former is overwritten by the latter.
* Set to false to skip adding the property.
**/
public $defaults = array(
'fb:admins' => false,
'fb:app_id' => false,
'og:url' => false,
'og:type' => 'website',
'og:title' => false,
'og:locale' => false,
'og:site_name' => false,
'og:image' => false,
'og:description' => false,
);
/**
* Map for CakePHP's config.language with Facebook's locale code
* used by _getLocale method.
*
* Since they can not be associated one to one,
* these values are supposed to be overwritten by Configure::write('OGPlocales').
**/
public $locales = array(
'ja' => 'ja_JP',
'en' => 'en_US',
);
/**
* Namespace attributes for OGP and Facebook
**/
protected $_ns = ' xmlns:og="http://ogp.me/ns#" xmlns:fb="http://www.facebook.com/2008/fbml"';
/**
* Map used to correct irregular property names
**/
protected $_propertyNames = array(
'admin' => 'fb:admins',
'admins' => 'fb:admins',
'app_id' => 'fb:app_id',
'appid' => 'fb:app_id',
'appId' => 'fb:app_id',
'appID' => 'fb:app_id',
'url' => 'og:url',
'URL' => 'og:url',
'type' => 'og:type',
'title' => 'og:title',
'locale' => 'og:locale',
'site_name' => 'og:site_name',
'sitename' => 'og:site_name',
'siteName' => 'og:site_name',
'image' => 'og:image',
'img' => 'og:image',
'description' => 'og:description',
);
protected $_properties = array();
public function __construct() {
$this->view =& ClassRegistry::getObject('view');
}
/**
* Sets default values
**/
public function beforeRender() {
$this->defaults = $this->_normalize($this->defaults);
$conf = $this->_normalize(Configure::read($this->configName));
$viewVar = $this->_normalize($this->view->getVar($this->varName));
$ogp = array_merge($this->defaults, $conf, $viewVar);
if ($this->autoGetUrl && empty($ogp['og:url'])) {
$ogp['og:url'] = $this->url(null, true);
}
if ($this->autoGetTitle && empty($ogp['og:title'])) {
$ogp['og:title'] = $this->_getTitle();
}
if ($this->autoGetSiteName && empty($ogp['og:site_name'])) {
$ogp['og:site_name'] = $this->_getSiteName();
}
if ($this->autoGetLocale && empty($ogp['og:locale'])) {
$ogp['og:locale'] = $this->_getLocale();
}
foreach ($ogp as $property => $content) {
$this->set($property, $content);
}
}
/**
* Sets a meta tag in the view layout's <head />
**/
public function set($property, $content = false, $id = false) {
if ($property) {
$property = $this->_getPropertyName($property);
if (empty($this->_properties[$property]) || !in_array($content, $this->_properties[$property])) {
if ($id === false) {
if ($property == 'og:image' && isset($this->_properties['og:image'])) {
$id = count($this->_properties['og:image']);
} else {
$id = 0;
}
}
if ($content === false) {
return $this->delete($property, $id);
} else {
$propertyId = $this->_getPropertyId($property, $id);
$meta = $this->Html->meta(null, null, array(
'property' => $property,
'content' => $content,
'inline' => true,
));
$this->view->addScript($propertyId, $meta);
$this->_properties[$property][$id] = $meta;
}
}
}
return $content;
}
/**
* Deletes a tag associated with property name and the ID.
**/
public function delete($property, $id = 0) {
if ($property) {
$property = $this->_getPropertyName($property);
$propertyId = $this->_getPropertyId($property, $id);
if (isset($this->view->__scripts[$propertyId], $this->_properties[$property][$id])) {
unset($this->view->__scripts[$propertyId]);
unset($this->_properties[$property][$id]);
return true;
}
}
return false;
}
/**
* Returns namespace attributes for OGP and Facebook.
**/
public function ns() {
return $this->_ns;
}
/**
* Normalizes property names set as keys of an array
**/
protected function _normalize($ogp) {
if (is_array($ogp)) {
foreach ($ogp as $property => $content) {
$propertyName = $this->_getPropertyName($property);
if ($propertyName != $property) {
unset($ogp[$property]);
$ogp[$propertyName] = $content;
}
}
} else {
$ogp = array();
}
return $ogp;
}
/**
* Returns a proper property name for an OGP tag
**/
protected function _getPropertyName($property) {
if (isset($this->_propertyNames[$property])) {
$property = $this->_propertyNames[$property];
}
return $property;
}
/**
* Returns the $title_for_layout for the current view
**/
protected function _getTitle() {
if (!$title = $this->view->getVar('title_for_layout')) {
$title = Inflector::humanize($this->view->viewPath);
}
if ($title) {
return __($title, true);
} else {
return false;
}
}
/**
* Returns the <title /> in the layout
**/
protected function _getSiteName() {
$layoutFileName = $this->view->_getLayoutFileName();
if ($layoutFileName && file_exists($layoutFileName)) {
if ($layout = file_get_contents($layoutFileName)) {
$layout = str_replace(array("\r", "\n"), ' ', $layout);
$pattern = '#<title.*?>(.+?)</title.*?>#i';
preg_match($pattern, $layout, $matches);
$title = $matches[1];
$pattern = '/<\?(?:php|=)(.*?)\?>/i';
preg_match_all($pattern, $title, $codes);
if (is_array($codes[1]) && $codes[1]) {
$debug = Configure::read('debug');
Configure::write('debug', 0);
foreach ($codes[1] as $key => $code) {
ob_start();
eval($code);
$result = ob_get_contents();
ob_end_clean();
$title = str_replace($codes[0][$key], $result, $title);
}
Configure::write('debug', $debug);
}
$title = trim($title);
if ($title) {
return $title;
}
}
}
return false;
}
/**
* Returns a Facebook locale code associated with Config.language
**/
protected function _getLocale() {
if (!class_exists('L10n')) {
App::import('Core', 'l10n');
}
$l10n = new L10n;
$l10n->get();
$language = Configure::read('Config.language');
if (!empty($_SESSION['Config']['language'])) {
$language = $_SESSION['Config']['language'];
}
if ($language) {
$this->locales = array_merge($this->locales, (array)Configure::read($this->configLocaleName));
if (!empty($this->locales[$language])) {
return $this->locales[$language];
}
}
return false;
}
/**
* Creates a property ID string
**/
protected function _getPropertyId($property, $id) {
return $property . '-' . $id;
}
}
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