<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014-2019 British Columbia Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author CodeIgniter Dev Team
* @copyright 2014-2019 British Columbia Institute of Technology (https://bcit.ca/)
* @license https://opensource.org/licenses/MIT MIT License
* @link https://codeigniter.com
* @since Version 4.0.0
* @filesource
*/
namespace CodeIgniter\Debug;
use CodeIgniter\API\ResponseTrait;
use CodeIgniter\Exceptions\PageNotFoundException;
use CodeIgniter\HTTP\IncomingRequest;
use CodeIgniter\HTTP\Response;
use Config\Paths;
use function error_reporting;
use ErrorException;
use Throwable;
/**
* Exceptions manager
*/
class Exceptions
{
use ResponseTrait;
/**
* Nesting level of the output buffering mechanism
*
* @var integer
*/
public $ob_level;
/**
* The path to the directory containing the
* cli and html error view directories.
*
* @var string
*/
protected $viewPath;
/**
* Config for debug exceptions.
*
* @var \Config\Exceptions
*/
protected $config;
/**
* The incoming request.
*
* @var \CodeIgniter\HTTP\IncomingRequest
*/
protected $request;
/**
* The outgoing response.
*
* @var \CodeIgniter\HTTP\Response
*/
protected $response;
//--------------------------------------------------------------------
/**
* Constructor.
*
* @param \Config\Exceptions $config
* @param \CodeIgniter\HTTP\IncomingRequest $request
* @param \CodeIgniter\HTTP\Response $response
*/
public function __construct(\Config\Exceptions $config, IncomingRequest $request, Response $response)
{
$this->ob_level = ob_get_level();
$this->viewPath = rtrim($config->errorViewPath, '/ ') . '/';
$this->config = $config;
$this->request = $request;
$this->response = $response;
}
//--------------------------------------------------------------------
/**
* Responsible for registering the error, exception and shutdown
* handling of our application.
*/
public function initialize()
{
//Set the Exception Handler
set_exception_handler([$this, 'exceptionHandler']);
// Set the Error Handler
set_error_handler([$this, 'errorHandler']);
// Set the handler for shutdown to catch Parse errors
// Do we need this in PHP7?
register_shutdown_function([$this, 'shutdownHandler']);
}
//--------------------------------------------------------------------
/**
* Catches any uncaught errors and exceptions, including most Fatal errors
* (Yay PHP7!). Will log the error, display it if display_errors is on,
* and fire an event that allows custom actions to be taken at this point.
*
* @param \Throwable $exception
*/
public function exceptionHandler(Throwable $exception)
{
$codes = $this->determineCodes($exception);
$statusCode = $codes[0];
$exitCode = $codes[1];
// Log it
if ($this->config->log === true && ! in_array($statusCode, $this->config->ignoreCodes))
{
log_message('critical', $exception->getMessage() . "\n{trace}", [
'trace' => $exception->getTraceAsString(),
]);
}
if (! is_cli())
{
$this->response->setStatusCode($statusCode);
$header = "HTTP/{$this->request->getProtocolVersion()} {$this->response->getStatusCode()} {$this->response->getReason()}";
header($header, true, $statusCode);
if (strpos($this->request->getHeaderLine('accept'), 'text/html') === false)
{
$this->respond(ENVIRONMENT === 'development' ? $this->collectVars($exception, $statusCode) : '', $statusCode)->send();
exit($exitCode);
}
}
$this->render($exception, $statusCode);
exit($exitCode);
}
//--------------------------------------------------------------------
/**
* Even in PHP7, some errors make it through to the errorHandler, so
* convert these to Exceptions and let the exception handler log it and
* display it.
*
* This seems to be primarily when a user triggers it with trigger_error().
*
* @param integer $severity
* @param string $message
* @param string|null $file
* @param integer|null $line
* @param null $context
*
* @throws \ErrorException
*/
public function errorHandler(int $severity, string $message, string $file = null, int $line = null, $context = null)
{
if (! (error_reporting() & $severity))
{
return;
}
// Convert it to an exception and pass it along.
throw new ErrorException($message, 0, $severity, $file, $line);
}
//--------------------------------------------------------------------
/**
* Checks to see if any errors have happened during shutdown that
* need to be caught and handle them.
*/
public function shutdownHandler()
{
$error = error_get_last();
// If we've got an error that hasn't been displayed, then convert
// it to an Exception and use the Exception handler to display it
// to the user.
if (! is_null($error))
{
// Fatal Error?
if (in_array($error['type'], [E_ERROR, E_CORE_ERROR, E_COMPILE_ERROR, E_PARSE]))
{
$this->exceptionHandler(new ErrorException($error['message'], $error['type'], 0, $error['file'], $error['line']));
}
}
}
//--------------------------------------------------------------------
/**
* Determines the view to display based on the exception thrown,
* whether an HTTP or CLI request, etc.
*
* @param \Throwable $exception
* @param string $template_path
*
* @return string The path and filename of the view file to use
*/
protected function determineView(Throwable $exception, string $template_path): string
{
// Production environments should have a custom exception file.
$view = 'production.php';
$template_path = rtrim($template_path, '/ ') . '/';
if (str_ireplace(['off', 'none', 'no', 'false', 'null'], '', ini_get('display_errors')))
{
$view = 'error_exception.php';
}
// 404 Errors
if ($exception instanceof PageNotFoundException)
{
return 'error_404.php';
}
// Allow for custom views based upon the status code
else if (is_file($template_path . 'error_' . $exception->getCode() . '.php'))
{
return 'error_' . $exception->getCode() . '.php';
}
return $view;
}
//--------------------------------------------------------------------
/**
* Given an exception and status code will display the error to the client.
*
* @param \Throwable $exception
* @param integer $statusCode
*/
protected function render(Throwable $exception, int $statusCode)
{
// Determine directory with views
$path = $this->viewPath;
if (empty($path))
{
$paths = new Paths();
$path = $paths->viewDirectory . '/errors/';
}
$path = is_cli() ? $path . 'cli/' : $path . 'html/';
// Determine the vew
$view = $this->determineView($exception, $path);
// Prepare the vars
$vars = $this->collectVars($exception, $statusCode);
extract($vars);
// Render it
if (ob_get_level() > $this->ob_level + 1)
{
ob_end_clean();
}
ob_start();
include($path . $view);
$buffer = ob_get_contents();
ob_end_clean();
echo $buffer;
}
//--------------------------------------------------------------------
/**
* Gathers the variables that will be made available to the view.
*
* @param \Throwable $exception
* @param integer $statusCode
*
* @return array
*/
protected function collectVars(Throwable $exception, int $statusCode): array
{
return [
'title' => get_class($exception),
'type' => get_class($exception),
'code' => $statusCode,
'message' => $exception->getMessage() ?? '(null)',
'file' => $exception->getFile(),
'line' => $exception->getLine(),
'trace' => $exception->getTrace(),
];
}
/**
* Determines the HTTP status code and the exit status code for this request.
*
* @param \Throwable $exception
*
* @return array
*/
protected function determineCodes(Throwable $exception): array
{
$statusCode = abs($exception->getCode());
if ($statusCode < 100 || $statusCode > 599)
{
$exitStatus = $statusCode + EXIT__AUTO_MIN; // 9 is EXIT__AUTO_MIN
if ($exitStatus > EXIT__AUTO_MAX) // 125 is EXIT__AUTO_MAX
{
$exitStatus = EXIT_ERROR; // EXIT_ERROR
}
$statusCode = 500;
}
else
{
$exitStatus = 1; // EXIT_ERROR
}
return [
$statusCode ?? 500,
$exitStatus,
];
}
//--------------------------------------------------------------------
//--------------------------------------------------------------------
// Display Methods
//--------------------------------------------------------------------
/**
* Clean Path
*
* This makes nicer looking paths for the error output.
*
* @param string $file
*
* @return string
*/
public static function cleanPath(string $file): string
{
if (strpos($file, APPPATH) === 0)
{
$file = 'APPPATH/' . substr($file, strlen(APPPATH));
}
elseif (strpos($file, SYSTEMPATH) === 0)
{
$file = 'SYSTEMPATH/' . substr($file, strlen(SYSTEMPATH));
}
elseif (strpos($file, FCPATH) === 0)
{
$file = 'FCPATH/' . substr($file, strlen(FCPATH));
}
return $file;
}
//--------------------------------------------------------------------
/**
* Describes memory usage in real-world units. Intended for use
* with memory_get_usage, etc.
*
* @param $bytes
*
* @return string
*/
public static function describeMemory(int $bytes): string
{
if ($bytes < 1024)
{
return $bytes . 'B';
}
else if ($bytes < 1048576)
{
return round($bytes / 1024, 2) . 'KB';
}
return round($bytes / 1048576, 2) . 'MB';
}
//--------------------------------------------------------------------
/**
* Creates a syntax-highlighted version of a PHP file.
*
* @param string $file
* @param integer $lineNumber
* @param integer $lines
*
* @return boolean|string
*/
public static function highlightFile(string $file, int $lineNumber, int $lines = 15)
{
if (empty($file) || ! is_readable($file))
{
return false;
}
// Set our highlight colors:
if (function_exists('ini_set'))
{
ini_set('highlight.comment', '#767a7e; font-style: italic');
ini_set('highlight.default', '#c7c7c7');
ini_set('highlight.html', '#06B');
ini_set('highlight.keyword', '#f1ce61;');
ini_set('highlight.string', '#869d6a');
}
try
{
$source = file_get_contents($file);
}
catch (Throwable $e)
{
return false;
}
$source = str_replace(["\r\n", "\r"], "\n", $source);
$source = explode("\n", highlight_string($source, true));
$source = str_replace('<br />', "\n", $source[1]);
$source = explode("\n", str_replace("\r\n", "\n", $source));
// Get just the part to show
$start = $lineNumber - (int) round($lines / 2);
$start = $start < 0 ? 0 : $start;
// Get just the lines we need to display, while keeping line numbers...
$source = array_splice($source, $start, $lines, true);
// Used to format the line number in the source
$format = '% ' . strlen(sprintf('%sd', $start + $lines));
$out = '';
// Because the highlighting may have an uneven number
// of open and close span tags on one line, we need
// to ensure we can close them all to get the lines
// showing correctly.
$spans = 1;
foreach ($source as $n => $row)
{
$spans += substr_count($row, '<span') - substr_count($row, '</span');
$row = str_replace(["\r", "\n"], ['', ''], $row);
if (($n + $start + 1) === $lineNumber)
{
preg_match_all('#<[^>]+>#', $row, $tags);
$out .= sprintf("<span class='line highlight'><span class='number'>{$format}</span> %s\n</span>%s", $n + $start + 1, strip_tags($row), implode('', $tags[0])
);
}
else
{
$out .= sprintf('<span class="line"><span class="number">' . $format . '</span> %s', $n + $start + 1, $row) . "\n";
}
}
if ($spans > 0)
{
$out .= str_repeat('</span>', $spans);
}
return '<pre><code>' . $out . '</code></pre>';
}
//--------------------------------------------------------------------
}
Jim Parry