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<?php
/**
* Piwik - Open source web analytics
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
* @version $Id$
*
* @category Piwik
* @package Piwik
*/
/**
* JSON export.
* Works with recursive DataTable (when a row can be associated with a subDataTable).
*
* @package Piwik
* @subpackage Piwik_DataTable
*/
class Piwik_DataTable_Renderer_Json extends Piwik_DataTable_Renderer
{
/**
* Computes the dataTable output and returns the string/binary
*
* @return string
*/
public function render()
{
$this->renderHeader();
return $this->renderTable($this->table);
}
/**
* Computes the exception output and returns the string/binary
*
* @return string
*/
function renderException()
{
$this->renderHeader();
$exceptionMessage = self::renderHtmlEntities($this->exception->getMessage());
$exceptionMessage = str_replace(array("\r\n","\n"), "", $exceptionMessage);
$exceptionMessage = '{"result":"error", "message":"'.$exceptionMessage.'"}';
return $this->jsonpWrap($exceptionMessage);
}
/**
* Computes the output for the given data table
*
* @param Piwik_DataTable $table
* @return string
*/
protected function renderTable($table)
{
if (is_array($table))
{
$array = $table;
if (self::shouldWrapArrayBeforeRendering($array, $wrapSingleValues = true))
{
$array = array($array);
}
}
else
{
$renderer = new Piwik_DataTable_Renderer_Php();
$renderer->setTable($table);
$renderer->setRenderSubTables($this->isRenderSubtables());
$renderer->setSerialize(false);
$renderer->setHideIdSubDatableFromResponse($this->hideIdSubDatatable);
$array = $renderer->flatRender();
}
if(!is_array($array))
{
$array = array('value' => $array);
}
// decode all entities
$callback = create_function('&$value,$key', 'if(is_string($value)){$value = html_entity_decode($value, ENT_QUOTES, "UTF-8");}');
array_walk_recursive($array, $callback);
$str = Piwik_Common::json_encode($array);
return $this->jsonpWrap($str);
}
/**
* @param $str
* @return string
*/
protected function jsonpWrap($str)
{
if(($jsonCallback = Piwik_Common::getRequestVar('callback', false)) === false)
$jsonCallback = Piwik_Common::getRequestVar('jsoncallback', false);
if($jsonCallback !== false)
{
if(preg_match('/^[0-9a-zA-Z_]*$/D', $jsonCallback) > 0)
{
$str = $jsonCallback . "(" . $str . ")";
}
}
return $str;
}
/**
* Sends the http header for json file
*/
protected function renderHeader()
{
self::sendHeaderJSON();
Piwik::overrideCacheControlHeaders();
}
public static function sendHeaderJSON()
{
@header('Content-Type: application/json; charset=utf-8');
}
}
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