symfony 1.4 api action class

gistfile1.aw

<?php
/**
 * Extended action class for adding json rendering functionality.
 * 
 * @author     Phil Moorhouse <[email protected]>
 * @package    tlv4
 * @subpackage api
 */
class tlApiActions extends sfActions
{
  
  /**
   * Forwards the request to the correct api method action based on method param
   */
  public function executeMethodSwitch(sfWebRequest $request)
  {
    if(!$method = $request->getParameter('method'))
    {
      return $this->renderError("param 'method' is required", 400, $request);
    }
    
    $moduleName = $this->getModuleName();
    
    if(!$this->getController()->actionExists($moduleName, $method))
    {
      return $this->renderError("method '$moduleName?method=$method' does not exist", 404, $request);
    }
    
    $this->forward($this->getModuleName(), $method);
  }
  
  
  /**
   * If the action is accessed directly in dev env then the json will be 
   * dumped to the screen. Otherwise data is returned as JSON or JSONP
   * with correct headers.
   */
  public function renderJson($data, $request)
  {
    if(sfConfig::get('sf_environment') == 'dev' && !$this->getRequest()->isXmlHttpRequest())
    {
      $this->data = $data;
      $this->setTemplate('debug');
    }
    else
    {
      $this->setLayout(false);
      
      if($callback = $request->getParameter('callback'))
      {
        // request is JSONP (cross-domain) so wrap JSON in callback function
        $this->getResponse()->setHttpHeader('Content-type','text/javascript');
        return $this->renderText($callback.'('.json_encode($data).');');
      }
      else
      {
        // request is for pure-JSON
        $this->getResponse()->setHttpHeader('Content-type','application/json');
        return $this->renderText(json_encode($data));
      }
    }
  }
  
  
  /**
   * Respond with an error message / status code
   * 
   * @param string $errorMsg       The error message to return
   * @param int    $httpStatusCode The http status code for the response header
   */
  public function renderError($errorMsg, $httpStatusCode = 500, $request)
  {
    $this->getResponse()->setStatusCode($httpStatusCode);
    return $this->renderJson(array('error' => $errorMsg), $request);
  }
  
}