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/*
 * This file is part of the symfony package.
 * (c) 2004-2006 Fabien Potencier <fabien.potencier@symfony-project.com>
 * (c) 2004-2006 Sean Kerr <sean@code-box.org>
 * 
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * sfException is the base class for all symfony related exceptions and
 * provides an additional method for printing up a detailed view of an
 * exception.
 *
 * @package    symfony
 * @subpackage exception
 * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
 * @author     Sean Kerr <sean@code-box.org>
 * @version    SVN: $Id: sfException.class.php 33214 2011-11-19 13:47:24Z fabien $
 */
class sfException extends Exception
{
  protected
    $wrappedException = null;

  static protected
    $lastException = null;

  /**
   * Wraps an Exception.
   *
   * @param Exception $e An Exception instance
   *
   * @return sfException An sfException instance that wraps the given Exception object
   */
  static public function createFromException(Exception $e)
  {
    $exception = new sfException(sprintf('Wrapped %s: %s', get_class($e), $e->getMessage()));
    $exception->setWrappedException($e);
    self::$lastException = $e;

    return $exception;
  }

  /**
   * Sets the wrapped exception.
   *
   * @param Exception $e An Exception instance
   */
  public function setWrappedException(Exception $e)
  {
    $this->wrappedException = $e;

    self::$lastException = $e;
  }

  /**
   * Gets the last wrapped exception.
   *
   * @return Exception An Exception instance
   */
  static public function getLastException()
  {
    return self::$lastException;
  }

  /**
   * Clears the $lastException property (added for #6342)
   */
  static public function clearLastException()
  {
  	self::$lastException = null;
  }
  
  /**
   * Prints the stack trace for this exception.
   */
  public function printStackTrace()
  {
    if (null === $this->wrappedException)
    {
      $this->setWrappedException($this);
    }

    $exception = $this->wrappedException;

    if (!sfConfig::get('sf_test'))
    {
      // log all exceptions in php log
      error_log($exception->getMessage());

      // clean current output buffer
      while (ob_get_level())
      {
        if (!ob_end_clean())
        {
          break;
        }
      }

      if (sfConfig::get('sf_compressed')) {
          ob_start('ob_gzhandler');
      }

      header('HTTP/1.0 500 Internal Server Error');
    }

    try
    {
      $this->outputStackTrace($exception);
    }
    catch (Exception $e)
    {
    }

    if (!sfConfig::get('sf_test'))
    {
      exit(1);
    }
  }

  /**
   * Gets the stack trace for this exception.
   */
  static protected function outputStackTrace(Exception $exception)
  {
    $format = 'html';
    $code   = '500';
    $text   = 'Internal Server Error';

    $response = null;
    if (class_exists('sfContext', false) && sfContext::hasInstance() && is_object($request = sfContext::getInstance()->getRequest()) && is_object($response = sfContext::getInstance()->getResponse()))
    {
      $dispatcher = sfContext::getInstance()->getEventDispatcher();

      if (sfConfig::get('sf_logging_enabled'))
      {
        $dispatcher->notify(new sfEvent($exception, 'application.log', array($exception->getMessage(), 'priority' => sfLogger::ERR)));
      }

      $event = $dispatcher->notifyUntil(new sfEvent($exception, 'application.throw_exception'));
      if ($event->isProcessed())
      {
        return;
      }

      if ($response->getStatusCode() < 300)
      {
        // status code has already been sent, but is included here for the purpose of testing
        $response->setStatusCode(500);
      }

      $response->setContentType('text/html');

      if (!sfConfig::get('sf_test'))
      {
        foreach ($response->getHttpHeaders() as $name => $value)
        {
          header($name.': '.$value);
        }
      }

      $code = $response->getStatusCode();
      $text = $response->getStatusText();

      $format = $request->getRequestFormat();
      if (!$format)
      {
        $format = 'html';
      }

      if ($mimeType = $request->getMimeType($format))
      {
        $response->setContentType($mimeType);
      }
    }
    else
    {
      // a backward compatible default
      if (!sfConfig::get('sf_test'))
      {
        header('Content-Type: text/html; charset='.sfConfig::get('sf_charset', 'utf-8'));
      }
    }

    // send an error 500 if not in debug mode
    if (!sfConfig::get('sf_debug'))
    {
      if ($template = self::getTemplatePathForError($format, false))
      {
        include $template;
        return;
      }
    }

    // when using CLI, we force the format to be TXT
    if (0 == strncasecmp(PHP_SAPI, 'cli', 3))
    {
      $format = 'txt';
    }

    $message = null === $exception->getMessage() ? 'n/a' : $exception->getMessage();
    $name    = get_class($exception);
    $traces  = self::getTraces($exception, $format);

    // dump main objects values
    $sf_settings = '';
    $settingsTable = $requestTable = $responseTable = $globalsTable = $userTable = '';
    if (class_exists('sfContext', false) && sfContext::hasInstance())
    {
      $context = sfContext::getInstance();
      $settingsTable = self::formatArrayAsHtml(sfDebug::settingsAsArray());
      $requestTable  = self::formatArrayAsHtml(sfDebug::requestAsArray($context->getRequest()));
      $responseTable = self::formatArrayAsHtml(sfDebug::responseAsArray($context->getResponse()));
      $userTable     = self::formatArrayAsHtml(sfDebug::userAsArray($context->getUser()));
      $globalsTable  = self::formatArrayAsHtml(sfDebug::globalsAsArray());
    }

    if (isset($response) && $response)
    {
      $response->sendHttpHeaders();
    }

    if ($template = self::getTemplatePathForError($format, true))
    {
      if (isset($dispatcher))
      {
        ob_start();
        include $template;
        $content = ob_get_clean();

        $event = $dispatcher->filter(new sfEvent($response, 'response.filter_content'), $content);

        echo $event->getReturnValue();
      }
      else
      {
        include $template;
      }

      return;
    }
  }

  /**
   * Returns the path for the template error message.
   *
   * @param  string  $format The request format
   * @param  Boolean $debug  Whether to return a template for the debug mode or not
   *
   * @return string|Boolean  false if the template cannot be found for the given format,
   *                         the absolute path to the template otherwise
   */
  static public function getTemplatePathForError($format, $debug)
  {
    $templatePaths = array(
      sfConfig::get('sf_app_config_dir').'/error',
      sfConfig::get('sf_config_dir').'/error',
      dirname(__FILE__).'/data',
    );

    $template = sprintf('%s.%s.php', $debug ? 'exception' : 'error', $format);
    foreach ($templatePaths as $path)
    {
      if (null !== $path && is_readable($file = $path.'/'.$template))
      {
        return $file;
      }
    }

    return false;
  }

  /**
   * Returns an array of exception traces.
   *
   * @param Exception $exception  An Exception implementation instance
   * @param string    $format     The trace format (txt or html)
   *
   * @return array An array of traces
   */
  static protected function getTraces($exception, $format = 'txt')
  {
    $traceData = $exception->getTrace();
    array_unshift($traceData, array(
      'function' => '',
      'file'     => $exception->getFile() != null ? $exception->getFile() : null,
      'line'     => $exception->getLine() != null ? $exception->getLine() : null,
      'args'     => array(),
    ));

    $traces = array();
    if ($format == 'html')
    {
      $lineFormat = 'at <strong>%s%s%s</strong>(%s)<br />in <em>%s</em> line %s <a href="#" onclick="toggle(\'%s\'); return false;">...</a><br /><ul class="code" id="%s" style="display: %s">%s</ul>';
    }
    else
    {
      $lineFormat = 'at %s%s%s(%s) in %s line %s';
    }

    for ($i = 0, $count = count($traceData); $i < $count; $i++)
    {
      $line = isset($traceData[$i]['line']) ? $traceData[$i]['line'] : null;
      $file = isset($traceData[$i]['file']) ? $traceData[$i]['file'] : null;
      $args = isset($traceData[$i]['args']) ? $traceData[$i]['args'] : array();
      $traces[] = sprintf($lineFormat,
        (isset($traceData[$i]['class']) ? $traceData[$i]['class'] : ''),
        (isset($traceData[$i]['type']) ? $traceData[$i]['type'] : ''),
        $traceData[$i]['function'],
        self::formatArgs($args, false, $format),
        self::formatFile($file, $line, $format, null === $file ? 'n/a' : sfDebug::shortenFilePath($file)),
        null === $line ? 'n/a' : $line,
        'trace_'.$i,
        'trace_'.$i,
        $i == 0 ? 'block' : 'none',
        self::fileExcerpt($file, $line)
      );
    }

    return $traces;
  }

  /**
   * Returns an HTML version of an array as YAML.
   *
   * @param array $values The values array
   *
   * @return string An HTML string
   */
  static protected function formatArrayAsHtml($values)
  {
    return '<pre>'.self::escape(@sfYaml::dump($values)).'</pre>';
  }

  /**
   * Returns an excerpt of a code file around the given line number.
   *
   * @param string $file  A file path
   * @param int    $line  The selected line number
   *
   * @return string An HTML string
   */
  static protected function fileExcerpt($file, $line)
  {
    if (is_readable($file))
    {
      $content = preg_split('#<br />#', preg_replace('/^<code>(.*)<\/code>$/s', '$1', highlight_file($file, true)));

      $lines = array();
      for ($i = max($line - 3, 1), $max = min($line + 3, count($content)); $i <= $max; $i++)
      {
        $lines[] = '<li'.($i == $line ? ' class="selected"' : '').'>'.$content[$i - 1].'</li>';
      }

      return '<ol start="'.max($line - 3, 1).'">'.implode("\n", $lines).'</ol>';
    }
  }

  /**
   * Formats an array as a string.
   *
   * @param array   $args     The argument array
   * @param boolean $single
   * @param string  $format   The format string (html or txt)
   *
   * @return string
   */
  static protected function formatArgs($args, $single = false, $format = 'html')
  {
    $result = array();

    $single and $args = array($args);

    foreach ($args as $key => $value)
    {
      if (is_object($value))
      {
        $formattedValue = ($format == 'html' ? '<em>object</em>' : 'object').sprintf("('%s')", get_class($value));
      }
      else if (is_array($value))
      {
        $formattedValue = ($format == 'html' ? '<em>array</em>' : 'array').sprintf("(%s)", self::formatArgs($value));
      }
      else if (is_string($value))
      {
        $formattedValue = ($format == 'html' ? sprintf("'%s'", self::escape($value)) : "'$value'");
      }
      else if (null === $value)
      {
        $formattedValue = ($format == 'html' ? '<em>null</em>' : 'null');
      }
      else
      {
        $formattedValue = $value;
      }
      
      $result[] = is_int($key) ? $formattedValue : sprintf("'%s' => %s", self::escape($key), $formattedValue);
    }

    return implode(', ', $result);
  }

  /**
   * Formats a file path.
   * 
   * @param  string  $file   An absolute file path
   * @param  integer $line   The line number
   * @param  string  $format The output format (txt or html)
   * @param  string  $text   Use this text for the link rather than the file path
   * 
   * @return string
   */
  static protected function formatFile($file, $line, $format = 'html', $text = null)
  {
    if (null === $text)
    {
      $text = $file;
    }

    if ('html' == $format && $file && $line && $linkFormat = sfConfig::get('sf_file_link_format', ini_get('xdebug.file_link_format')))
    {
      $link = strtr($linkFormat, array('%f' => $file, '%l' => $line));
      $text = sprintf('<a href="%s" title="Click to open this file" class="file_link">%s</a>', $link, $text);
    }

    return $text;
  }

  /**
   * Escapes a string value with html entities
   *
   * @param  string  $value
   *
   * @return string
   */
  static protected function escape($value)
  {
    if (!is_string($value))
    {
      return $value;
    }
    
    return htmlspecialchars($value, ENT_QUOTES, sfConfig::get('sf_charset', 'UTF-8'));
  }
}