framework/web/ErrorHandler.php
<?php
/**
* @link https://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license https://www.yiiframework.com/license/
*/
namespace yii\web;
use Yii;
use yii\base\ErrorException;
use yii\base\Exception;
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`.
*
* For more details and usage information on ErrorHandler, see the [guide article on handling errors](guide:runtime-handling-errors).
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @author Timur Ruziev <resurtm@gmail.com>
* @since 2.0
*/
class ErrorHandler extends \yii\base\ErrorHandler
{
/**
* @var int maximum number of source code lines to be displayed. Defaults to 19.
*/
public $maxSourceLines = 19;
/**
* @var int maximum number of trace source code lines to be displayed. Defaults to 13.
*/
public $maxTraceSourceLines = 13;
/**
* @var string|null the route (e.g. `site/error`) to the controller action that will be used
* to display external errors. Inside the action, it can retrieve the error information
* using `Yii::$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 $previousExceptionView = '@yii/views/errorHandler/previousException.php';
/**
* @var array list of the PHP predefined variables that should be displayed on the error page.
* Note that a variable must be accessible via `$GLOBALS`. Otherwise it won't be displayed.
* Defaults to `['_GET', '_POST', '_FILES', '_COOKIE', '_SESSION']`.
* @see renderRequest()
* @since 2.0.7
*/
public $displayVars = ['_GET', '_POST', '_FILES', '_COOKIE', '_SESSION'];
/**
* @var string trace line with placeholders to be be substituted.
* The placeholders are {file}, {line} and {text} and the string should be as follows.
*
* `File: {file} - Line: {line} - Text: {text}`
*
* @example <a href="ide://open?file={file}&line={line}">{html}</a>
* @see https://github.com/yiisoft/yii2-debug#open-files-in-ide
* @since 2.0.14
*/
public $traceLine = '{html}';
/**
* Renders the exception.
* @param \Throwable $exception the exception to be rendered.
*/
protected function renderException($exception)
{
if (Yii::$app->has('response')) {
$response = Yii::$app->getResponse();
// reset parameters of response to avoid interference with partially created response data
// in case the error occurred while sending the response.
$response->isSent = false;
$response->stream = null;
$response->data = null;
$response->content = null;
} else {
$response = new Response();
}
$response->setStatusCodeByException($exception);
$useErrorView = $response->format === Response::FORMAT_HTML && (!YII_DEBUG || $exception instanceof UserException);
if ($useErrorView && $this->errorAction !== null) {
Yii::$app->view->clear();
$result = Yii::$app->runAction($this->errorAction);
if ($result instanceof Response) {
$response = $result;
} else {
$response->data = $result;
}
} elseif ($response->format === Response::FORMAT_HTML) {
if ($this->shouldRenderSimpleHtml()) {
// AJAX request
$response->data = '<pre>' . $this->htmlEncode(static::convertExceptionToString($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) {
$response->data = static::convertExceptionToString($exception);
} else {
$response->data = $this->convertExceptionToArray($exception);
}
$response->send();
}
/**
* Converts an exception into an array.
* @param \Throwable $exception the exception being converted
* @return array the array representation of the exception.
*/
protected function convertExceptionToArray($exception)
{
if (!YII_DEBUG && !$exception instanceof UserException && !$exception instanceof HttpException) {
$exception = new HttpException(500, Yii::t('yii', 'An internal server error occurred.'));
}
$array = [
'name' => ($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_NOQUOTES | ENT_SUBSTITUTE | ENT_HTML5, 'UTF-8');
}
/**
* 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 = null;
$shouldGenerateLink = true;
if ($method !== null && substr_compare($method, '{closure}', -9) !== 0) {
$reflection = new \ReflectionClass($class);
if ($reflection->hasMethod($method)) {
$reflectionMethod = $reflection->getMethod($method);
$shouldGenerateLink = $reflectionMethod->isPublic() || $reflectionMethod->isProtected();
} else {
$shouldGenerateLink = false;
}
}
if ($shouldGenerateLink) {
$url = $this->getTypeUrl($class, $method);
}
if ($url === null) {
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, $method)
{
if (strncmp($class, 'yii\\', 4) !== 0) {
return null;
}
$page = $this->htmlEncode(strtolower(str_replace('\\', '-', $class)));
$url = "https://www.yiiframework.com/doc-2.0/$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();
}
$view = Yii::$app->getView();
$view->clear();
return $view->renderFile($_file_, $_params_, $this);
}
/**
* Renders the previous exception stack for a given Exception.
* @param \Throwable $exception the exception whose precursors should be rendered.
* @return string HTML content of the rendered previous exceptions.
* Empty string if there are none.
*/
public function renderPreviousExceptions($exception)
{
if (($previous = $exception->getPrevious()) !== null) {
return $this->renderFile($this->previousExceptionView, ['exception' => $previous]);
}
return '';
}
/**
* Renders a single call stack element.
* @param string|null $file name where call has happened.
* @param int|null $line number on which call has happened.
* @param string|null $class called class name.
* @param string|null $method called function/method name.
* @param array $args array of method arguments.
* @param int $index number of the call stack element.
* @return string HTML content of the rendered call stack element.
*/
public function renderCallStackItem($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) {
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 call stack.
* @param \Throwable $exception exception to get call stack from
* @return string HTML content of the rendered call stack.
* @since 2.0.12
*/
public function renderCallStack($exception)
{
$out = '<ul>';
$out .= $this->renderCallStackItem($exception->getFile(), $exception->getLine(), null, null, [], 1);
for ($i = 0, $trace = $exception->getTrace(), $length = count($trace); $i < $length; ++$i) {
$file = !empty($trace[$i]['file']) ? $trace[$i]['file'] : null;
$line = !empty($trace[$i]['line']) ? $trace[$i]['line'] : null;
$class = !empty($trace[$i]['class']) ? $trace[$i]['class'] : null;
$function = null;
if (!empty($trace[$i]['function']) && $trace[$i]['function'] !== 'unknown') {
$function = $trace[$i]['function'];
}
$args = !empty($trace[$i]['args']) ? $trace[$i]['args'] : [];
$out .= $this->renderCallStackItem($file, $line, $class, $function, $args, $i + 2);
}
$out .= '</ul>';
return $out;
}
/**
* Renders the global variables of the request.
* List of global variables is defined in [[displayVars]].
* @return string the rendering result
* @see displayVars
*/
public function renderRequest()
{
$request = '';
foreach ($this->displayVars as $name) {
if (!empty($GLOBALS[$name])) {
$request .= '$' . $name . ' = ' . VarDumper::export($GLOBALS[$name]) . ";\n\n";
}
}
return '<pre>' . $this->htmlEncode(rtrim($request, "\n")) . '</pre>';
}
/**
* Determines whether given name of the file belongs to the framework.
* @param string $file name to be checked.
* @return bool whether given name of the file belongs to the framework.
*/
public function isCoreFile($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 int $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="https://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()
{
$serverUrls = [
'https://httpd.apache.org/' => ['apache'],
'https://nginx.org/' => ['nginx'],
'https://www.lighttpd.net/' => ['lighttpd'],
'http://gwan.com/' => ['g-wan', 'gwan'],
'https://www.iis.net/' => ['iis', 'services'],
'https://www.php.net/manual/en/features.commandline.webserver.php' => ['development'],
];
if (isset($_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="https://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, 'UTF-8') > 32) {
$displayValue = $this->htmlEncode(mb_substr($value, 0, 32, 'UTF-8')) . '...';
$args[$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]";
}
}
return implode(', ', $args);
}
/**
* Returns human-readable exception name.
* @param \Throwable $exception
* @return string|null human-readable exception name or null if it cannot be determined
*/
public function getExceptionName($exception)
{
if ($exception instanceof \yii\base\Exception || $exception instanceof \yii\base\InvalidCallException || $exception instanceof \yii\base\InvalidParamException || $exception instanceof \yii\base\UnknownMethodException) {
return $exception->getName();
}
return null;
}
/**
* @return bool if simple HTML should be rendered
* @since 2.0.12
*/
protected function shouldRenderSimpleHtml()
{
return YII_ENV_TEST || Yii::$app->request->getIsAjax();
}
}