<?php /** * @link http://www.yiiframework.com/ * @copyright Copyright (c) 2008 Yii Software LLC * @license http://www.yiiframework.com/license/ */ namespace yii\web; use Yii; use yii\base\Exception; use yii\base\ErrorException; use yii\base\UserException; use yii\helpers\VarDumper; /** * ErrorHandler handles uncaught PHP errors and exceptions. * * ErrorHandler displays these errors using appropriate views based on the * nature of the errors and the mode the application runs at. * * ErrorHandler is configured as an application component in [[\yii\base\Application]] by default. * You can access that instance via `Yii::$app->errorHandler`. * * @author Qiang Xue <qiang.xue@gmail.com> * @author Timur Ruziev <resurtm@gmail.com> * @since 2.0 */ class ErrorHandler extends \yii\base\ErrorHandler { /** * @var integer maximum number of source code lines to be displayed. Defaults to 19. */ public $maxSourceLines = 19; /** * @var integer maximum number of trace source code lines to be displayed. Defaults to 13. */ public $maxTraceSourceLines = 13; /** * @var string the route (e.g. 'site/error') to the controller action that will be used * to display external errors. Inside the action, it can retrieve the error information * using `Yii::$app->errorHandler->exception. This property defaults to null, meaning ErrorHandler * will handle the error display. */ public $errorAction; /** * @var string the path of the view file for rendering exceptions without call stack information. */ public $errorView = '@yii/views/errorHandler/error.php'; /** * @var string the path of the view file for rendering exceptions. */ public $exceptionView = '@yii/views/errorHandler/exception.php'; /** * @var string the path of the view file for rendering exceptions and errors call stack element. */ public $callStackItemView = '@yii/views/errorHandler/callStackItem.php'; /** * @var string the path of the view file for rendering previous exceptions. */ public $previousExceptionView = '@yii/views/errorHandler/previousException.php'; /** * Renders the exception. * @param \Exception $exception the exception to be rendered. */ protected function renderException($exception) { if (Yii::$app->has('response')) { $response = Yii::$app->getResponse(); $response->isSent = false; } else { $response = new Response(); } $useErrorView = $response->format === Response::FORMAT_HTML && (!YII_DEBUG || $exception instanceof UserException); if ($useErrorView && $this->errorAction !== null) { $result = Yii::$app->runAction($this->errorAction); if ($result instanceof Response) { $response = $result; } else { $response->data = $result; } } elseif ($response->format === Response::FORMAT_HTML) { if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] === 'XMLHttpRequest' || YII_ENV_TEST) { // AJAX request $response->data = '<pre>' . $this->htmlEncode($this->convertExceptionToString($exception)) . '</pre>'; } else { // if there is an error during error rendering it's useful to // display PHP error in debug mode instead of a blank screen if (YII_DEBUG) { ini_set('display_errors', 1); } $file = $useErrorView ? $this->errorView : $this->exceptionView; $response->data = $this->renderFile($file, [ 'exception' => $exception, ]); } } elseif ($response->format === Response::FORMAT_RAW) { $response->data = $exception; } else { $response->data = $this->convertExceptionToArray($exception); } if ($exception instanceof HttpException) { $response->setStatusCode($exception->statusCode); } else { $response->setStatusCode(500); } $response->send(); } /** * Converts an exception into an array. * @param \Exception $exception the exception being converted * @return array the array representation of the exception. */ protected function convertExceptionToArray($exception) { if (!YII_DEBUG && !$exception instanceof UserException && !$exception instanceof HttpException) { $exception = new HttpException(500, 'There was an error at the server.'); } $array = [ 'name' => ($exception instanceof Exception || $exception instanceof ErrorException) ? $exception->getName() : 'Exception', 'message' => $exception->getMessage(), 'code' => $exception->getCode(), ]; if ($exception instanceof HttpException) { $array['status'] = $exception->statusCode; } if (YII_DEBUG) { $array['type'] = get_class($exception); if (!$exception instanceof UserException) { $array['file'] = $exception->getFile(); $array['line'] = $exception->getLine(); $array['stack-trace'] = explode("\n", $exception->getTraceAsString()); if ($exception instanceof \yii\db\Exception) { $array['error-info'] = $exception->errorInfo; } } } if (($prev = $exception->getPrevious()) !== null) { $array['previous'] = $this->convertExceptionToArray($prev); } return $array; } /** * Converts special characters to HTML entities. * @param string $text to encode. * @return string encoded original text. */ public function htmlEncode($text) { return htmlspecialchars($text, ENT_QUOTES, Yii::$app->charset); } /** * Adds informational links to the given PHP type/class. * @param string $code type/class name to be linkified. * @return string linkified with HTML type/class name. */ public function addTypeLinks($code) { if (preg_match('/(.*?)::([^(]+)/', $code, $matches)) { $class = $matches[1]; $method = $matches[2]; $text = $this->htmlEncode($class) . '::' . $this->htmlEncode($method); } else { $class = $code; $method = null; $text = $this->htmlEncode($class); } $url = $this->getTypeUrl($class, $method); if (!$url) { return $text; } return '<a href="' . $url . '" target="_blank">' . $text . '</a>'; } /** * Returns the informational link URL for a given PHP type/class. * @param string $class the type or class name. * @param string|null $method the method name. * @return string|null the informational link URL. * @see addTypeLinks() */ protected function getTypeUrl($class, $method) { if (strpos($class, 'yii\\') !== 0) { return null; } $page = $this->htmlEncode(strtolower(str_replace('\\', '-', $class))); $url = "http://www.yiiframework.com/doc-2.0/$page.html"; if ($method) { $url .= "#$method()-detail"; } return $url; } /** * Renders a view file as a PHP script. * @param string $_file_ the view file. * @param array $_params_ the parameters (name-value pairs) that will be extracted and made available in the view file. * @return string the rendering result */ public function renderFile($_file_, $_params_) { $_params_['handler'] = $this; if ($this->exception instanceof ErrorException || !Yii::$app->has('view')) { ob_start(); ob_implicit_flush(false); extract($_params_, EXTR_OVERWRITE); require(Yii::getAlias($_file_)); return ob_get_clean(); } else { return Yii::$app->getView()->renderFile($_file_, $_params_, $this); } } /** * Renders the previous exception stack for a given Exception. * @param \Exception $exception the exception whose precursors should be rendered. * @return string HTML content of the rendered previous exceptions. * Empty string if there are none. */ public function renderPreviousExceptions($exception) { if (($previous = $exception->getPrevious()) !== null) { return $this->renderFile($this->previousExceptionView, ['exception' => $previous]); } else { return ''; } } /** * Renders a single call stack element. * @param string|null $file name where call has happened. * @param integer|null $line number on which call has happened. * @param string|null $class called class name. * @param string|null $method called function/method name. * @param integer $index number of the call stack element. * @param array $args array of method arguments. * @return string HTML content of the rendered call stack element. */ public function renderCallStackItem($file, $line, $class, $method, $args, $index) { $lines = []; $begin = $end = 0; if ($file !== null && $line !== null) { $line--; // adjust line number from one-based to zero-based $lines = @file($file); if ($line < 0 || $lines === false || ($lineCount = count($lines)) < $line + 1) { return ''; } $half = (int) (($index == 1 ? $this->maxSourceLines : $this->maxTraceSourceLines) / 2); $begin = $line - $half > 0 ? $line - $half : 0; $end = $line + $half < $lineCount ? $line + $half : $lineCount - 1; } return $this->renderFile($this->callStackItemView, [ 'file' => $file, 'line' => $line, 'class' => $class, 'method' => $method, 'index' => $index, 'lines' => $lines, 'begin' => $begin, 'end' => $end, 'args' => $args, ]); } /** * Renders the request information. * @return string the rendering result */ public function renderRequest() { $request = ''; foreach (['_GET', '_POST', '_SERVER', '_FILES', '_COOKIE', '_SESSION', '_ENV'] as $name) { if (!empty($GLOBALS[$name])) { $request .= '$' . $name . ' = ' . VarDumper::export($GLOBALS[$name]) . ";\n\n"; } } return '<pre>' . rtrim($request, "\n") . '</pre>'; } /** * Determines whether given name of the file belongs to the framework. * @param string $file name to be checked. * @return boolean whether given name of the file belongs to the framework. */ public function isCoreFile($file) { return $file === null || strpos(realpath($file), YII2_PATH . DIRECTORY_SEPARATOR) === 0; } /** * Creates HTML containing link to the page with the information on given HTTP status code. * @param integer $statusCode to be used to generate information link. * @param string $statusDescription Description to display after the the status code. * @return string generated HTML with HTTP status code information. */ public function createHttpStatusLink($statusCode, $statusDescription) { return '<a href="http://en.wikipedia.org/wiki/List_of_HTTP_status_codes#' . (int) $statusCode . '" target="_blank">HTTP ' . (int) $statusCode . ' – ' . $statusDescription . '</a>'; } /** * Creates string containing HTML link which refers to the home page of determined web-server software * and its full name. * @return string server software information hyperlink. */ public function createServerInformationLink() { $serverUrls = [ 'http://httpd.apache.org/' => ['apache'], 'http://nginx.org/' => ['nginx'], 'http://lighttpd.net/' => ['lighttpd'], 'http://gwan.com/' => ['g-wan', 'gwan'], 'http://iis.net/' => ['iis', 'services'], 'http://php.net/manual/en/features.commandline.webserver.php' => ['development'], ]; if (isset($_SERVER['SERVER_SOFTWARE'])) { foreach ($serverUrls as $url => $keywords) { foreach ($keywords as $keyword) { if (stripos($_SERVER['SERVER_SOFTWARE'], $keyword) !== false) { return '<a href="' . $url . '" target="_blank">' . $this->htmlEncode($_SERVER['SERVER_SOFTWARE']) . '</a>'; } } } } return ''; } /** * Creates string containing HTML link which refers to the page with the current version * of the framework and version number text. * @return string framework version information hyperlink. */ public function createFrameworkVersionLink() { return '<a href="http://github.com/yiisoft/yii2/" target="_blank">' . $this->htmlEncode(Yii::getVersion()) . '</a>'; } /** * Converts arguments array to its string representation * * @param array $args arguments array to be converted * @return string string representation of the arguments array */ public function argumentsToString($args) { $count = 0; $isAssoc = $args !== array_values($args); foreach ($args as $key => $value) { $count++; if($count>=5) { if($count>5) { unset($args[$key]); } else { $args[$key] = '...'; } continue; } if (is_object($value)) { $args[$key] = '<span class="title">' . $this->htmlEncode(get_class($value)) . '</span>'; } elseif (is_bool($value)) { $args[$key] = '<span class="keyword">' . ($value ? 'true' : 'false') . '</span>'; } elseif (is_string($value)) { $fullValue = $this->htmlEncode($value); if (mb_strlen($value, 'utf8') > 32) { $displayValue = $this->htmlEncode(mb_substr($value, 0, 32, 'utf8')) . '...'; $args[$key] = "<span class=\"string\" title=\"$fullValue\">'$displayValue'</span>"; } else { $args[$key] = "<span class=\"string\">'$fullValue'</span>"; } } elseif (is_array($value)) { $args[$key] = '[' . $this->argumentsToString($value) . ']'; } elseif ($value === null) { $args[$key] = '<span class="keyword">null</span>'; } elseif(is_resource($value)) { $args[$key] = '<span class="keyword">resource</span>'; } else { $args[$key] = '<span class="number">' . $value . '</span>'; } if (is_string($key)) { $args[$key] = '<span class="string">\'' . $this->htmlEncode($key) . "'</span> => $args[$key]"; } elseif ($isAssoc) { $args[$key] = "<span class=\"number\">$key</span> => $args[$key]"; } } $out = implode(", ", $args); return $out; } /** * Returns human-readable exception name * @param \Exception $exception * @return string human-readable exception name or null if it cannot be determined */ public function getExceptionName($exception) { if ($exception instanceof \yii\base\Exception || $exception instanceof \yii\base\InvalidCallException || $exception instanceof \yii\base\InvalidParamException || $exception instanceof \yii\base\UnknownMethodException) { return $exception->getName(); } return null; } }