415 lines
16 KiB
PHP
415 lines
16 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Debug;
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use Symfony\Component\Debug\Exception\FlattenException;
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use Symfony\Component\Debug\Exception\OutOfMemoryException;
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/**
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* ExceptionHandler converts an exception to a Response object.
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*
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* It is mostly useful in debug mode to replace the default PHP/XDebug
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* output with something prettier and more useful.
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*
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* As this class is mainly used during Kernel boot, where nothing is yet
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* available, the Response content is always HTML.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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* @author Nicolas Grekas <p@tchwork.com>
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*/
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class ExceptionHandler
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{
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private $debug;
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private $charset;
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private $handler;
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private $caughtBuffer;
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private $caughtLength;
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private $fileLinkFormat;
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public function __construct($debug = true, $charset = null, $fileLinkFormat = null)
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{
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$this->debug = $debug;
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$this->charset = $charset ?: ini_get('default_charset') ?: 'UTF-8';
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$this->fileLinkFormat = $fileLinkFormat ?: ini_get('xdebug.file_link_format') ?: get_cfg_var('xdebug.file_link_format');
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}
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/**
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* Registers the exception handler.
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*
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* @param bool $debug Enable/disable debug mode, where the stack trace is displayed
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* @param string|null $charset The charset used by exception messages
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* @param string|null $fileLinkFormat The IDE link template
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*
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* @return ExceptionHandler The registered exception handler
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*/
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public static function register($debug = true, $charset = null, $fileLinkFormat = null)
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{
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$handler = new static($debug, $charset, $fileLinkFormat);
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$prev = set_exception_handler(array($handler, 'handle'));
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if (is_array($prev) && $prev[0] instanceof ErrorHandler) {
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restore_exception_handler();
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$prev[0]->setExceptionHandler(array($handler, 'handle'));
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}
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return $handler;
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}
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/**
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* Sets a user exception handler.
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*
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* @param callable $handler An handler that will be called on Exception
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*
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* @return callable|null The previous exception handler if any
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*/
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public function setHandler(callable $handler = null)
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{
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$old = $this->handler;
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$this->handler = $handler;
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return $old;
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}
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/**
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* Sets the format for links to source files.
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*
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* @param string $format The format for links to source files
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*
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* @return string The previous file link format.
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*/
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public function setFileLinkFormat($format)
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{
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$old = $this->fileLinkFormat;
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$this->fileLinkFormat = $format;
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return $old;
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}
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/**
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* Sends a response for the given Exception.
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*
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* To be as fail-safe as possible, the exception is first handled
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* by our simple exception handler, then by the user exception handler.
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* The latter takes precedence and any output from the former is cancelled,
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* if and only if nothing bad happens in this handling path.
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*/
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public function handle(\Exception $exception)
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{
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if (null === $this->handler || $exception instanceof OutOfMemoryException) {
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$this->sendPhpResponse($exception);
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return;
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}
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$caughtLength = $this->caughtLength = 0;
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ob_start(function ($buffer) {
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$this->caughtBuffer = $buffer;
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return '';
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});
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$this->sendPhpResponse($exception);
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while (null === $this->caughtBuffer && ob_end_flush()) {
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// Empty loop, everything is in the condition
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}
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if (isset($this->caughtBuffer[0])) {
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ob_start(function ($buffer) {
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if ($this->caughtLength) {
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// use substr_replace() instead of substr() for mbstring overloading resistance
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$cleanBuffer = substr_replace($buffer, '', 0, $this->caughtLength);
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if (isset($cleanBuffer[0])) {
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$buffer = $cleanBuffer;
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}
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}
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return $buffer;
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});
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echo $this->caughtBuffer;
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$caughtLength = ob_get_length();
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}
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$this->caughtBuffer = null;
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try {
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call_user_func($this->handler, $exception);
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$this->caughtLength = $caughtLength;
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} catch (\Exception $e) {
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if (!$caughtLength) {
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// All handlers failed. Let PHP handle that now.
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throw $exception;
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}
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}
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}
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/**
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* Sends the error associated with the given Exception as a plain PHP response.
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*
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* This method uses plain PHP functions like header() and echo to output
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* the response.
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*
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* @param \Exception|FlattenException $exception An \Exception or FlattenException instance
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*/
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public function sendPhpResponse($exception)
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{
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if (!$exception instanceof FlattenException) {
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$exception = FlattenException::create($exception);
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}
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if (!headers_sent()) {
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header(sprintf('HTTP/1.0 %s', $exception->getStatusCode()));
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foreach ($exception->getHeaders() as $name => $value) {
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header($name.': '.$value, false);
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}
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header('Content-Type: text/html; charset='.$this->charset);
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}
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echo $this->decorate($this->getContent($exception), $this->getStylesheet($exception));
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}
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/**
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* Gets the full HTML content associated with the given exception.
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*
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* @param \Exception|FlattenException $exception An \Exception or FlattenException instance
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*
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* @return string The HTML content as a string
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*/
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public function getHtml($exception)
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{
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if (!$exception instanceof FlattenException) {
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$exception = FlattenException::create($exception);
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}
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return $this->decorate($this->getContent($exception), $this->getStylesheet($exception));
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}
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/**
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* Gets the HTML content associated with the given exception.
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*
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* @param FlattenException $exception A FlattenException instance
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*
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* @return string The content as a string
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*/
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public function getContent(FlattenException $exception)
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{
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switch ($exception->getStatusCode()) {
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case 404:
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$title = 'Sorry, the page you are looking for could not be found.';
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break;
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default:
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$title = 'Whoops, looks like something went wrong.';
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}
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$content = '';
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if ($this->debug) {
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try {
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$count = count($exception->getAllPrevious());
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$total = $count + 1;
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foreach ($exception->toArray() as $position => $e) {
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$ind = $count - $position + 1;
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$class = $this->formatClass($e['class']);
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$message = nl2br($this->escapeHtml($e['message']));
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$content .= sprintf(<<<'EOF'
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<h2 class="block_exception clear_fix">
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<span class="exception_counter">%d/%d</span>
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<span class="exception_title">%s%s:</span>
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<span class="exception_message">%s</span>
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</h2>
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<div class="block">
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<ol class="traces list_exception">
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EOF
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, $ind, $total, $class, $this->formatPath($e['trace'][0]['file'], $e['trace'][0]['line']), $message);
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foreach ($e['trace'] as $trace) {
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$content .= ' <li>';
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if ($trace['function']) {
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$content .= sprintf('at %s%s%s(%s)', $this->formatClass($trace['class']), $trace['type'], $trace['function'], $this->formatArgs($trace['args']));
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}
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if (isset($trace['file']) && isset($trace['line'])) {
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$content .= $this->formatPath($trace['file'], $trace['line']);
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}
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$content .= "</li>\n";
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}
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$content .= " </ol>\n</div>\n";
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}
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} catch (\Exception $e) {
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// something nasty happened and we cannot throw an exception anymore
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if ($this->debug) {
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$title = sprintf('Exception thrown when handling an exception (%s: %s)', get_class($e), $this->escapeHtml($e->getMessage()));
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} else {
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$title = 'Whoops, looks like something went wrong.';
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}
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}
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}
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return <<<EOF
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<div id="sf-resetcontent" class="sf-reset">
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<h1>$title</h1>
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$content
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</div>
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EOF;
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}
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/**
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* Gets the stylesheet associated with the given exception.
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*
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* @param FlattenException $exception A FlattenException instance
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*
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* @return string The stylesheet as a string
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*/
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public function getStylesheet(FlattenException $exception)
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{
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return <<<'EOF'
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.sf-reset { font: 11px Verdana, Arial, sans-serif; color: #333 }
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.sf-reset .clear { clear:both; height:0; font-size:0; line-height:0; }
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.sf-reset .clear_fix:after { display:block; height:0; clear:both; visibility:hidden; }
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.sf-reset .clear_fix { display:inline-block; }
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.sf-reset * html .clear_fix { height:1%; }
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.sf-reset .clear_fix { display:block; }
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.sf-reset, .sf-reset .block { margin: auto }
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.sf-reset abbr { border-bottom: 1px dotted #000; cursor: help; }
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.sf-reset p { font-size:14px; line-height:20px; color:#868686; padding-bottom:20px }
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.sf-reset strong { font-weight:bold; }
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.sf-reset a { color:#6c6159; cursor: default; }
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.sf-reset a img { border:none; }
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.sf-reset a:hover { text-decoration:underline; }
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.sf-reset em { font-style:italic; }
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.sf-reset h1, .sf-reset h2 { font: 20px Georgia, "Times New Roman", Times, serif }
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.sf-reset .exception_counter { background-color: #fff; color: #333; padding: 6px; float: left; margin-right: 10px; float: left; display: block; }
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.sf-reset .exception_title { margin-left: 3em; margin-bottom: 0.7em; display: block; }
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.sf-reset .exception_message { margin-left: 3em; display: block; }
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.sf-reset .traces li { font-size:12px; padding: 2px 4px; list-style-type:decimal; margin-left:20px; }
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.sf-reset .block { background-color:#FFFFFF; padding:10px 28px; margin-bottom:20px;
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-webkit-border-bottom-right-radius: 16px;
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-webkit-border-bottom-left-radius: 16px;
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-moz-border-radius-bottomright: 16px;
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-moz-border-radius-bottomleft: 16px;
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border-bottom-right-radius: 16px;
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border-bottom-left-radius: 16px;
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border-bottom:1px solid #ccc;
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border-right:1px solid #ccc;
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border-left:1px solid #ccc;
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}
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.sf-reset .block_exception { background-color:#ddd; color: #333; padding:20px;
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-webkit-border-top-left-radius: 16px;
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-webkit-border-top-right-radius: 16px;
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-moz-border-radius-topleft: 16px;
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-moz-border-radius-topright: 16px;
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border-top-left-radius: 16px;
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border-top-right-radius: 16px;
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border-top:1px solid #ccc;
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border-right:1px solid #ccc;
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border-left:1px solid #ccc;
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overflow: hidden;
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word-wrap: break-word;
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}
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.sf-reset a { background:none; color:#868686; text-decoration:none; }
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.sf-reset a:hover { background:none; color:#313131; text-decoration:underline; }
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.sf-reset ol { padding: 10px 0; }
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.sf-reset h1 { background-color:#FFFFFF; padding: 15px 28px; margin-bottom: 20px;
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-webkit-border-radius: 10px;
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-moz-border-radius: 10px;
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border-radius: 10px;
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border: 1px solid #ccc;
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}
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EOF;
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}
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private function decorate($content, $css)
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{
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return <<<EOF
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="{$this->charset}" />
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<meta name="robots" content="noindex,nofollow" />
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<style>
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/* Copyright (c) 2010, Yahoo! Inc. All rights reserved. Code licensed under the BSD License: http://developer.yahoo.com/yui/license.html */
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html{color:#000;background:#FFF;}body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,textarea,p,blockquote,th,td{margin:0;padding:0;}table{border-collapse:collapse;border-spacing:0;}fieldset,img{border:0;}address,caption,cite,code,dfn,em,strong,th,var{font-style:normal;font-weight:normal;}li{list-style:none;}caption,th{text-align:left;}h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:normal;}q:before,q:after{content:'';}abbr,acronym{border:0;font-variant:normal;}sup{vertical-align:text-top;}sub{vertical-align:text-bottom;}input,textarea,select{font-family:inherit;font-size:inherit;font-weight:inherit;}input,textarea,select{*font-size:100%;}legend{color:#000;}
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html { background: #eee; padding: 10px }
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img { border: 0; }
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#sf-resetcontent { width:970px; margin:0 auto; }
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$css
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</style>
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</head>
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<body>
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$content
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</body>
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</html>
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EOF;
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}
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private function formatClass($class)
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{
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$parts = explode('\\', $class);
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return sprintf('<abbr title="%s">%s</abbr>', $class, array_pop($parts));
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}
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private function formatPath($path, $line)
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{
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$path = $this->escapeHtml($path);
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$file = preg_match('#[^/\\\\]*$#', $path, $file) ? $file[0] : $path;
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if ($linkFormat = $this->fileLinkFormat) {
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$link = strtr($this->escapeHtml($linkFormat), array('%f' => $path, '%l' => (int) $line));
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return sprintf(' in <a href="%s" title="Go to source">%s line %d</a>', $link, $file, $line);
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}
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return sprintf(' in <a title="%s line %3$d" ondblclick="var f=this.innerHTML;this.innerHTML=this.title;this.title=f;">%s line %d</a>', $path, $file, $line);
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}
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/**
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* Formats an array as a string.
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*
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* @param array $args The argument array
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*
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* @return string
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*/
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private function formatArgs(array $args)
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{
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$result = array();
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foreach ($args as $key => $item) {
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if ('object' === $item[0]) {
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$formattedValue = sprintf('<em>object</em>(%s)', $this->formatClass($item[1]));
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} elseif ('array' === $item[0]) {
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$formattedValue = sprintf('<em>array</em>(%s)', is_array($item[1]) ? $this->formatArgs($item[1]) : $item[1]);
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} elseif ('string' === $item[0]) {
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$formattedValue = sprintf("'%s'", $this->escapeHtml($item[1]));
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} elseif ('null' === $item[0]) {
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$formattedValue = '<em>null</em>';
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} elseif ('boolean' === $item[0]) {
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$formattedValue = '<em>'.strtolower(var_export($item[1], true)).'</em>';
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} elseif ('resource' === $item[0]) {
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$formattedValue = '<em>resource</em>';
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} else {
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$formattedValue = str_replace("\n", '', var_export($this->escapeHtml((string) $item[1]), true));
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}
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$result[] = is_int($key) ? $formattedValue : sprintf("'%s' => %s", $key, $formattedValue);
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}
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return implode(', ', $result);
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}
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/**
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* HTML-encodes a string.
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*/
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private function escapeHtml($str)
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{
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return htmlspecialchars($str, ENT_QUOTES | ENT_SUBSTITUTE, $this->charset);
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}
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}
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