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<?php
/**
* Piwik - free/libre analytics platform
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
*/
namespace Piwik\API;
use Exception;
use Piwik\Common;
use Piwik\DataTable;
use Piwik\DataTable\Renderer;
use Piwik\DataTable\DataTableInterface;
use Piwik\DataTable\Filter\ColumnDelete;
use Piwik\Plugin\Report;
use Piwik\Plugins\API\Renderer\Original;
/**
*/
class ResponseBuilder
{
private $outputFormat = null;
private $apiRenderer = null;
private $request = null;
private $sendHeader = true;
private $postProcessDataTable = true;
private $apiModule = false;
private $apiMethod = false;
/**
* @param string $outputFormat
* @param array $request
*/
public function __construct($outputFormat, $request = array())
{
$this->outputFormat = $outputFormat;
$this->request = $request;
$this->apiRenderer = ApiRenderer::factory($outputFormat, $request);
}
public function disableSendHeader()
{
$this->sendHeader = false;
}
public function disableDataTablePostProcessor()
{
$this->postProcessDataTable = false;
}
/**
* This method processes the data resulting from the API call.
*
* - If the data resulted from the API call is a DataTable then
* - we apply the standard filters if the parameters have been found
* in the URL. For example to offset,limit the Table you can add the following parameters to any API
* call that returns a DataTable: filter_limit=10&filter_offset=20
* - we apply the filters that have been previously queued on the DataTable
* @see DataTable::queueFilter()
* - we apply the renderer that generate the DataTable in a given format (XML, PHP, HTML, JSON, etc.)
* the format can be changed using the 'format' parameter in the request.
* Example: format=xml
*
* - If there is nothing returned (void) we display a standard success message
*
* - If there is a PHP array returned, we try to convert it to a dataTable
* It is then possible to convert this datatable to any requested format (xml/etc)
*
* - If a bool is returned we convert to a string (true is displayed as 'true' false as 'false')
*
* - If an integer / float is returned, we simply return it
*
* @param mixed $value The initial returned value, before post process. If set to null, success response is returned.
* @param bool|string $apiModule The API module that was called
* @param bool|string $apiMethod The API method that was called
* @return mixed Usually a string, but can still be a PHP data structure if the format requested is 'original'
*/
public function getResponse($value = null, $apiModule = false, $apiMethod = false)
{
$this->apiModule = $apiModule;
$this->apiMethod = $apiMethod;
$this->sendHeaderIfEnabled();
// when null or void is returned from the api call, we handle it as a successful operation
if (!isset($value)) {
if (ob_get_contents()) {
return null;
}
return $this->apiRenderer->renderSuccess('ok');
}
// If the returned value is an object DataTable we
// apply the set of generic filters if asked in the URL
// and we render the DataTable according to the format specified in the URL
if ($value instanceof DataTableInterface) {
return $this->handleDataTable($value);
}
// Case an array is returned from the API call, we convert it to the requested format
// - if calling from inside the application (format = original)
// => the data stays unchanged (ie. a standard php array or whatever data structure)
// - if any other format is requested, we have to convert this data structure (which we assume
// to be an array) to a DataTable in order to apply the requested DataTable_Renderer (for example XML)
if (is_array($value)) {
return $this->handleArray($value);
}
if (is_object($value)) {
return $this->apiRenderer->renderObject($value);
}
if (is_resource($value)) {
return $this->apiRenderer->renderResource($value);
}
return $this->apiRenderer->renderScalar($value);
}
/**
* Returns an error $message in the requested $format
*
* @param Exception $e
* @throws Exception
* @return string
*/
public function getResponseException(Exception $e)
{
$e = $this->decorateExceptionWithDebugTrace($e);
$message = $this->formatExceptionMessage($e);
$this->sendHeaderIfEnabled();
return $this->apiRenderer->renderException($message, $e);
}
/**
* @param Exception $e
* @return Exception
*/
private function decorateExceptionWithDebugTrace(Exception $e)
{
// If we are in tests, show full backtrace
if (defined('PIWIK_PATH_TEST_TO_ROOT')) {
if (\Piwik_ShouldPrintBackTraceWithMessage()) {
$message = $e->getMessage() . " in \n " . $e->getFile() . ":" . $e->getLine() . " \n " . $e->getTraceAsString();
} else {
$message = $e->getMessage() . "\n \n --> To temporarily debug this error further, set const PIWIK_PRINT_ERROR_BACKTRACE=true; in index.php";
}
return new Exception($message);
}
return $e;
}
private function formatExceptionMessage(Exception $exception)
{
$message = $exception->getMessage();
if (\Piwik_ShouldPrintBackTraceWithMessage()) {
$message .= "\n" . $exception->getTraceAsString();
}
return Renderer::formatValueXml($message);
}
private function handleDataTable(DataTableInterface $datatable)
{
if ($this->postProcessDataTable) {
$postProcessor = new DataTablePostProcessor($this->apiModule, $this->apiMethod, $this->request);
$datatable = $postProcessor->process($datatable);
}
return $this->apiRenderer->renderDataTable($datatable);
}
private function handleArray($array)
{
$firstArray = null;
$firstKey = null;
if (!empty($array)) {
$firstArray = reset($array);
$firstKey = key($array);
}
$isAssoc = !empty($firstArray) && is_numeric($firstKey) && is_array($firstArray) && count(array_filter(array_keys($firstArray), 'is_string'));
if ($isAssoc) {
$hideColumns = Common::getRequestVar('hideColumns', '', 'string', $this->request);
$showColumns = Common::getRequestVar('showColumns', '', 'string', $this->request);
if ($hideColumns !== '' || $showColumns !== '') {
$columnDelete = new ColumnDelete(new DataTable(), $hideColumns, $showColumns);
$array = $columnDelete->filter($array);
}
} else if (is_numeric($firstKey)) {
$limit = Common::getRequestVar('filter_limit', -1, 'integer', $this->request);
$offset = Common::getRequestVar('filter_offset', '0', 'integer', $this->request);
if (-1 !== $limit) {
$array = array_slice($array, $offset, $limit);
}
}
return $this->apiRenderer->renderArray($array);
}
private function sendHeaderIfEnabled()
{
if ($this->sendHeader) {
$this->apiRenderer->sendHeader();
}
}
}
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