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<?php
/**
* @package FrameworkOnFramework
* @subpackage view
* @copyright Copyright (C) 2010 - 2012 Akeeba Ltd. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
// Protect from unauthorized access
defined('_JEXEC') or die;
JLoader::import('joomla.application.component.view');
/**
* FrameworkOnFramework JSON View class. Renders the data as a JSON object or
* array. It can optionally output HAL links as well.
*
* @package FrameworkOnFramework
* @since 2.0
*/
class FOFViewJson extends FOFViewHtml
{
/**
* When set to true we'll add hypermedia to the output, implementing the
* HAL specification (http://stateless.co/hal_specification.html)
*
* @var boolean
*/
public $useHypermedia = false;
/**
* Public constructor
*
* @param array $config The component's configuration array
*/
public function __construct($config = array())
{
parent::__construct($config);
if (isset($config['use_hypermedia']))
{
$this->useHypermedia = (bool) $config['use_hypermedia'];
}
}
/**
* The event which runs when we are displaying the record list JSON view
*
* @param string $tpl The view sub-template to use
*
* @return boolean True to allow display of the view
*/
protected function onDisplay($tpl = null)
{
// Load the model
$model = $this->getModel();
$items = $model->getItemList();
$this->items = $items;
$document = FOFPlatform::getInstance()->getDocument();
if ($document instanceof JDocument)
{
if ($this->useHypermedia)
{
$document->setMimeEncoding('application/hal+json');
}
else
{
$document->setMimeEncoding('application/json');
}
}
if (is_null($tpl))
{
$tpl = 'json';
}
if (version_compare(JVERSION, '3.0', 'lt'))
{
FOFPlatform::getInstance()->setErrorHandling(E_ALL, 'ignore');
}
$hasFailed = false;
try
{
$result = $this->loadTemplate($tpl, true);
if ($result instanceof Exception)
{
$hasFailed = true;
}
}
catch (Exception $e)
{
$hasFailed = true;
}
if (version_compare(JVERSION, '3.0', 'lt'))
{
if ($result instanceof Exception)
{
$hasFailed = true;
}
}
if ($hasFailed)
{
// Default JSON behaviour in case the template isn't there!
if ($this->useHypermedia)
{
$haldocument = $this->_createDocumentWithHypermedia($items, $model);
$json = $haldocument->render('json');
}
else
{
$json = json_encode($items);
}
// JSONP support
$callback = $this->input->getVar('callback', null);
if (!empty($callback))
{
echo $callback . '(' . $json . ')';
}
else
{
$defaultName = $this->input->getCmd('view', 'joomla');
$filename = $this->input->getCmd('basename', $defaultName);
$document->setName($filename);
echo $json;
}
return false;
}
else
{
echo $result;
return false;
}
}
/**
* The event which runs when we are displaying a single item JSON view
*
* @param string $tpl The view sub-template to use
*
* @return boolean True to allow display of the view
*/
protected function onRead($tpl = null)
{
$model = $this->getModel();
$item = $model->getItem();
$this->item = $item;
$document = FOFPlatform::getInstance()->getDocument();
if ($document instanceof JDocument)
{
if ($this->useHypermedia)
{
$document->setMimeEncoding('application/hal+json');
}
else
{
$document->setMimeEncoding('application/json');
}
}
if (is_null($tpl))
{
$tpl = 'json';
}
if (version_compare(JVERSION, '3.0', 'lt'))
{
FOFPlatform::getInstance()->setErrorHandling(E_ALL, 'ignore');
}
$hasFailed = false;
try
{
$result = $this->loadTemplate($tpl, true);
if ($result instanceof Exception)
{
$hasFailed = true;
}
}
catch (Exception $e)
{
$hasFailed = true;
}
if (version_compare(JVERSION, '3.0', 'lt'))
{
if ($result instanceof Exception)
{
$hasFailed = true;
}
}
if ($hasFailed)
{
// Default JSON behaviour in case the template isn't there!
if ($this->useHypermedia)
{
$haldocument = $this->_createDocumentWithHypermedia($item, $model);
$json = $haldocument->render('json');
}
else
{
$json = json_encode($item);
}
// JSONP support
$callback = $this->input->get('callback', null);
if (!empty($callback))
{
echo $callback . '(' . $json . ')';
}
else
{
$defaultName = $this->input->getCmd('view', 'joomla');
$filename = $this->input->getCmd('basename', $defaultName);
$document->setName($filename);
echo $json;
}
return false;
}
else
{
echo $result;
return false;
}
}
/**
* Creates a FOFHalDocument using the provided data
*
* @param array $data The data to put in the document
* @param FOFModel $model The model of this view
*
* @return FOFHalDocument A HAL-enabled document
*/
protected function _createDocumentWithHypermedia($data, $model = null)
{
// Create a new HAL document
if (is_array($data))
{
$count = count($data);
}
else
{
$count = null;
}
if ($count == 1)
{
reset($data);
$document = new FOFHalDocument(end($data));
}
else
{
$document = new FOFHalDocument($data);
}
// Create a self link
$uri = (string) (JUri::getInstance());
$uri = $this->_removeURIBase($uri);
$uri = JRoute::_($uri);
$document->addLink('self', new FOFHalLink($uri));
// Create relative links in a record list context
if (is_array($data) && ($model instanceof FOFModel))
{
$pagination = $model->getPagination();
if ($pagination->get('pages.total') > 1)
{
// Try to guess URL parameters and create a prototype URL
// NOTE: You are better off specialising this method
$protoUri = $this->_getPrototypeURIForPagination();
// The "first" link
$uri = clone $protoUri;
$uri->setVar('limitstart', 0);
$uri = JRoute::_((string) $uri);
$document->addLink('first', new FOFHalLink($uri));
// Do we need a "prev" link?
if ($pagination->get('pages.current') > 1)
{
$prevPage = $pagination->get('pages.current') - 1;
$limitstart = ($prevPage - 1) * $pagination->limit;
$uri = clone $protoUri;
$uri->setVar('limitstart', $limitstart);
$uri = JRoute::_((string) $uri);
$document->addLink('prev', new FOFHalLink($uri));
}
// Do we need a "next" link?
if ($pagination->get('pages.current') < $pagination->get('pages.total'))
{
$nextPage = $pagination->get('pages.current') + 1;
$limitstart = ($nextPage - 1) * $pagination->limit;
$uri = clone $protoUri;
$uri->setVar('limitstart', $limitstart);
$uri = JRoute::_((string) $uri);
$document->addLink('next', new FOFHalLink($uri));
}
// The "last" link?
$lastPage = $pagination->get('pages.total');
$limitstart = ($lastPage - 1) * $pagination->limit;
$uri = clone $protoUri;
$uri->setVar('limitstart', $limitstart);
$uri = JRoute::_((string) $uri);
$document->addLink('last', new FOFHalLink($uri));
}
}
return $document;
}
/**
* Convert an absolute URI to a relative one
*
* @param string $uri The URI to convert
*
* @return string The relative URL
*/
protected function _removeURIBase($uri)
{
static $root = null, $rootlen = 0;
if (is_null($root))
{
$root = rtrim(JURI::base(), '/');
$rootlen = strlen($root);
}
if (substr($uri, 0, $rootlen) == $root)
{
$uri = substr($uri, $rootlen);
}
return ltrim($uri, '/');
}
/**
* Returns a JUri instance with a prototype URI used as the base for the
* other URIs created by the JSON renderer
*
* @return JUri The prototype JUri instance
*/
protected function _getPrototypeURIForPagination()
{
$protoUri = new JUri('index.php');
$protoUri->setQuery($this->input->getData());
$protoUri->delVar('savestate');
$protoUri->delVar('base_path');
return $protoUri;
}
}
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