symfony/debug/ExceptionHandler.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Debug;

use Symfony\Component\Debug\Exception\FlattenException;
use Symfony\Component\Debug\Exception\OutOfMemoryException;
use Symfony\Component\HttpKernel\Debug\FileLinkFormatter;

/**
 * ExceptionHandler converts an exception to a Response object.
 *
 * It is mostly useful in debug mode to replace the default PHP/XDebug
 * output with something prettier and more useful.
 *
 * As this class is mainly used during Kernel boot, where nothing is yet
 * available, the Response content is always HTML.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 * @author Nicolas Grekas <p@tchwork.com>
 */
class ExceptionHandler
{
    private $debug;
    private $charset;
    private $handler;
    private $caughtBuffer;
    private $caughtLength;
    private $fileLinkFormat;

    public function __construct($debug = true, $charset = null, $fileLinkFormat = null)
    {
        $this->debug = $debug;
        $this->charset = $charset ?: ini_get('default_charset') ?: 'UTF-8';
        $this->fileLinkFormat = $fileLinkFormat;
    }

    /**
     * Registers the exception handler.
     *
     * @param bool        $debug          Enable/disable debug mode, where the stack trace is displayed
     * @param string|null $charset        The charset used by exception messages
     * @param string|null $fileLinkFormat The IDE link template
     *
     * @return static
     */
    public static function register($debug = true, $charset = null, $fileLinkFormat = null)
    {
        $handler = new static($debug, $charset, $fileLinkFormat);

        $prev = set_exception_handler([$handler, 'handle']);
        if (\is_array($prev) && $prev[0] instanceof ErrorHandler) {
            restore_exception_handler();
            $prev[0]->setExceptionHandler([$handler, 'handle']);
        }

        return $handler;
    }

    /**
     * Sets a user exception handler.
     *
     * @param callable $handler An handler that will be called on Exception
     *
     * @return callable|null The previous exception handler if any
     */
    public function setHandler(callable $handler = null)
    {
        $old = $this->handler;
        $this->handler = $handler;

        return $old;
    }

    /**
     * Sets the format for links to source files.
     *
     * @param string|FileLinkFormatter $fileLinkFormat The format for links to source files
     *
     * @return string The previous file link format
     */
    public function setFileLinkFormat($fileLinkFormat)
    {
        $old = $this->fileLinkFormat;
        $this->fileLinkFormat = $fileLinkFormat;

        return $old;
    }

    /**
     * Sends a response for the given Exception.
     *
     * To be as fail-safe as possible, the exception is first handled
     * by our simple exception handler, then by the user exception handler.
     * The latter takes precedence and any output from the former is cancelled,
     * if and only if nothing bad happens in this handling path.
     */
    public function handle(\Exception $exception)
    {
        if (null === $this->handler || $exception instanceof OutOfMemoryException) {
            $this->sendPhpResponse($exception);

            return;
        }

        $caughtLength = $this->caughtLength = 0;

        ob_start(function ($buffer) {
            $this->caughtBuffer = $buffer;

            return '';
        });

        $this->sendPhpResponse($exception);
        while (null === $this->caughtBuffer && ob_end_flush()) {
            // Empty loop, everything is in the condition
        }
        if (isset($this->caughtBuffer[0])) {
            ob_start(function ($buffer) {
                if ($this->caughtLength) {
                    // use substr_replace() instead of substr() for mbstring overloading resistance
                    $cleanBuffer = substr_replace($buffer, '', 0, $this->caughtLength);
                    if (isset($cleanBuffer[0])) {
                        $buffer = $cleanBuffer;
                    }
                }

                return $buffer;
            });

            echo $this->caughtBuffer;
            $caughtLength = ob_get_length();
        }
        $this->caughtBuffer = null;

        try {
            \call_user_func($this->handler, $exception);
            $this->caughtLength = $caughtLength;
        } catch (\Exception $e) {
            if (!$caughtLength) {
                // All handlers failed. Let PHP handle that now.
                throw $exception;
            }
        }
    }

    /**
     * Sends the error associated with the given Exception as a plain PHP response.
     *
     * This method uses plain PHP functions like header() and echo to output
     * the response.
     *
     * @param \Exception|FlattenException $exception An \Exception or FlattenException instance
     */
    public function sendPhpResponse($exception)
    {
        if (!$exception instanceof FlattenException) {
            $exception = FlattenException::create($exception);
        }

        if (!headers_sent()) {
            header(sprintf('HTTP/1.0 %s', $exception->getStatusCode()));
            foreach ($exception->getHeaders() as $name => $value) {
                header($name.': '.$value, false);
            }
            header('Content-Type: text/html; charset='.$this->charset);
        }

        echo $this->decorate($this->getContent($exception), $this->getStylesheet($exception));
    }

    /**
     * Gets the full HTML content associated with the given exception.
     *
     * @param \Exception|FlattenException $exception An \Exception or FlattenException instance
     *
     * @return string The HTML content as a string
     */
    public function getHtml($exception)
    {
        if (!$exception instanceof FlattenException) {
            $exception = FlattenException::create($exception);
        }

        return $this->decorate($this->getContent($exception), $this->getStylesheet($exception));
    }

    /**
     * Gets the HTML content associated with the given exception.
     *
     * @return string The content as a string
     */
    public function getContent(FlattenException $exception)
    {
        switch ($exception->getStatusCode()) {
            case 404:
                $title = 'Sorry, the page you are looking for could not be found.';
                break;
            default:
                $title = 'Whoops, looks like something went wrong.';
        }

        if (!$this->debug) {
            return <<<EOF
                <div class="container">
                    <h1>$title</h1>
                </div>
EOF;
        }

        $content = '';
        try {
            $count = \count($exception->getAllPrevious());
            $total = $count + 1;
            foreach ($exception->toArray() as $position => $e) {
                $ind = $count - $position + 1;
                $class = $this->formatClass($e['class']);
                $message = nl2br($this->escapeHtml($e['message']));
                $content .= sprintf(<<<'EOF'
                    <div class="trace trace-as-html">
                        <table class="trace-details">
                            <thead class="trace-head"><tr><th>
                                <h3 class="trace-class">
                                    <span class="text-muted">(%d/%d)</span>
                                    <span class="exception_title">%s</span>
                                </h3>
                                <p class="break-long-words trace-message">%s</p>
                            </th></tr></thead>
                            <tbody>
EOF
                    , $ind, $total, $class, $message);
                foreach ($e['trace'] as $trace) {
                    $content .= '<tr><td>';
                    if ($trace['function']) {
                        $content .= sprintf('at <span class="trace-class">%s</span><span class="trace-type">%s</span><span class="trace-method">%s</span>(<span class="trace-arguments">%s</span>)', $this->formatClass($trace['class']), $trace['type'], $trace['function'], $this->formatArgs($trace['args']));
                    }
                    if (isset($trace['file']) && isset($trace['line'])) {
                        $content .= $this->formatPath($trace['file'], $trace['line']);
                    }
                    $content .= "</td></tr>\n";
                }

                $content .= "</tbody>\n</table>\n</div>\n";
            }
        } catch (\Exception $e) {
            // something nasty happened and we cannot throw an exception anymore
            if ($this->debug) {
                $title = sprintf('Exception thrown when handling an exception (%s: %s)', \get_class($e), $this->escapeHtml($e->getMessage()));
            } else {
                $title = 'Whoops, looks like something went wrong.';
            }
        }

        $symfonyGhostImageContents = $this->getSymfonyGhostAsSvg();

        return <<<EOF
            <div class="exception-summary">
                <div class="container">
                    <div class="exception-message-wrapper">
                        <h1 class="break-long-words exception-message">$title</h1>
                        <div class="exception-illustration hidden-xs-down">$symfonyGhostImageContents</div>
                    </div>
                </div>
            </div>

            <div class="container">
                $content
            </div>
EOF;
    }

    /**
     * Gets the stylesheet associated with the given exception.
     *
     * @return string The stylesheet as a string
     */
    public function getStylesheet(FlattenException $exception)
    {
        if (!$this->debug) {
            return <<<'EOF'
                body { background-color: #fff; color: #222; font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; margin: 0; }
                .container { margin: 30px; max-width: 600px; }
                h1 { color: #dc3545; font-size: 24px; }
EOF;
        }

        return <<<'EOF'
            body { background-color: #F9F9F9; color: #222; font: 14px/1.4 Helvetica, Arial, sans-serif; margin: 0; padding-bottom: 45px; }

            a { cursor: pointer; text-decoration: none; }
            a:hover { text-decoration: underline; }
            abbr[title] { border-bottom: none; cursor: help; text-decoration: none; }

            code, pre { font: 13px/1.5 Consolas, Monaco, Menlo, "Ubuntu Mono", "Liberation Mono", monospace; }

            table, tr, th, td { background: #FFF; border-collapse: collapse; vertical-align: top; }
            table { background: #FFF; border: 1px solid #E0E0E0; box-shadow: 0px 0px 1px rgba(128, 128, 128, .2); margin: 1em 0; width: 100%; }
            table th, table td { border: solid #E0E0E0; border-width: 1px 0; padding: 8px 10px; }
            table th { background-color: #E0E0E0; font-weight: bold; text-align: left; }

            .hidden-xs-down { display: none; }
            .block { display: block; }
            .break-long-words { -ms-word-break: break-all; word-break: break-all; word-break: break-word; -webkit-hyphens: auto; -moz-hyphens: auto; hyphens: auto; }
            .text-muted { color: #999; }

            .container { max-width: 1024px; margin: 0 auto; padding: 0 15px; }
            .container::after { content: ""; display: table; clear: both; }

            .exception-summary { background: #B0413E; border-bottom: 2px solid rgba(0, 0, 0, 0.1); border-top: 1px solid rgba(0, 0, 0, .3); flex: 0 0 auto; margin-bottom: 30px; }

            .exception-message-wrapper { display: flex; align-items: center; min-height: 70px; }
            .exception-message { flex-grow: 1; padding: 30px 0; }
            .exception-message, .exception-message a { color: #FFF; font-size: 21px; font-weight: 400; margin: 0; }
            .exception-message.long { font-size: 18px; }
            .exception-message a { border-bottom: 1px solid rgba(255, 255, 255, 0.5); font-size: inherit; text-decoration: none; }
            .exception-message a:hover { border-bottom-color: #ffffff; }

            .exception-illustration { flex-basis: 111px; flex-shrink: 0; height: 66px; margin-left: 15px; opacity: .7; }

            .trace + .trace { margin-top: 30px; }
            .trace-head .trace-class { color: #222; font-size: 18px; font-weight: bold; line-height: 1.3; margin: 0; position: relative; }

            .trace-message { font-size: 14px; font-weight: normal; margin: .5em 0 0; }

            .trace-file-path, .trace-file-path a { color: #222; margin-top: 3px; font-size: 13px; }
            .trace-class { color: #B0413E; }
            .trace-type { padding: 0 2px; }
            .trace-method { color: #B0413E; font-weight: bold; }
            .trace-arguments { color: #777; font-weight: normal; padding-left: 2px; }

            @media (min-width: 575px) {
                .hidden-xs-down { display: initial; }
            }
EOF;
    }

    private function decorate($content, $css)
    {
        return <<<EOF
<!DOCTYPE html>
<html>
    <head>
        <meta charset="{$this->charset}" />
        <meta name="robots" content="noindex,nofollow" />
        <style>$css</style>
    </head>
    <body>
        $content
    </body>
</html>
EOF;
    }

    private function formatClass($class)
    {
        $parts = explode('\\', $class);

        return sprintf('<abbr title="%s">%s</abbr>', $class, array_pop($parts));
    }

    private function formatPath($path, $line)
    {
        $file = $this->escapeHtml(preg_match('#[^/\\\\]*+$#', $path, $file) ? $file[0] : $path);
        $fmt = $this->fileLinkFormat ?: ini_get('xdebug.file_link_format') ?: get_cfg_var('xdebug.file_link_format');

        if (!$fmt) {
            return sprintf('<span class="block trace-file-path">in <span title="%s%3$s"><strong>%s</strong>%s</span></span>', $this->escapeHtml($path), $file, 0 < $line ? ' line '.$line : '');
        }

        if (\is_string($fmt)) {
            $i = strpos($f = $fmt, '&', max(strrpos($f, '%f'), strrpos($f, '%l'))) ?: \strlen($f);
            $fmt = [substr($f, 0, $i)] + preg_split('/&([^>]++)>/', substr($f, $i), -1, PREG_SPLIT_DELIM_CAPTURE);

            for ($i = 1; isset($fmt[$i]); ++$i) {
                if (0 === strpos($path, $k = $fmt[$i++])) {
                    $path = substr_replace($path, $fmt[$i], 0, \strlen($k));
                    break;
                }
            }

            $link = strtr($fmt[0], ['%f' => $path, '%l' => $line]);
        } else {
            try {
                $link = $fmt->format($path, $line);
            } catch (\Exception $e) {
                return sprintf('<span class="block trace-file-path">in <span title="%s%3$s"><strong>%s</strong>%s</span></span>', $this->escapeHtml($path), $file, 0 < $line ? ' line '.$line : '');
            }
        }

        return sprintf('<span class="block trace-file-path">in <a href="%s" title="Go to source"><strong>%s</string>%s</a></span>', $this->escapeHtml($link), $file, 0 < $line ? ' line '.$line : '');
    }

    /**
     * Formats an array as a string.
     *
     * @param array $args The argument array
     *
     * @return string
     */
    private function formatArgs(array $args)
    {
        $result = [];
        foreach ($args as $key => $item) {
            if ('object' === $item[0]) {
                $formattedValue = sprintf('<em>object</em>(%s)', $this->formatClass($item[1]));
            } elseif ('array' === $item[0]) {
                $formattedValue = sprintf('<em>array</em>(%s)', \is_array($item[1]) ? $this->formatArgs($item[1]) : $item[1]);
            } elseif ('null' === $item[0]) {
                $formattedValue = '<em>null</em>';
            } elseif ('boolean' === $item[0]) {
                $formattedValue = '<em>'.strtolower(var_export($item[1], true)).'</em>';
            } elseif ('resource' === $item[0]) {
                $formattedValue = '<em>resource</em>';
            } else {
                $formattedValue = str_replace("\n", '', $this->escapeHtml(var_export($item[1], true)));
            }

            $result[] = \is_int($key) ? $formattedValue : sprintf("'%s' => %s", $this->escapeHtml($key), $formattedValue);
        }

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

    /**
     * HTML-encodes a string.
     */
    private function escapeHtml($str)
    {
        return htmlspecialchars($str, ENT_COMPAT | ENT_SUBSTITUTE, $this->charset);
    }

    private function getSymfonyGhostAsSvg()
    {
        return '<svg viewBox="0 0 136 81" xmlns="http://www.w3.org/2000/svg" fill-rule="evenodd" clip-rule="evenodd" stroke-linejoin="round" stroke-miterlimit="1.4"><path d="M92.4 20.4a23.2 23.2 0 0 1 9 1.9 23.7 23.7 0 0 1 5.2 3 24.3 24.3 0 0 1 3.4 3.4 24.8 24.8 0 0 1 5 9.4c.5 1.7.8 3.4 1 5.2v14.5h.4l.5.2a7.4 7.4 0 0 0 2.5.2l.2-.2.6-.8.8-1.3-.2-.1a5.5 5.5 0 0 1-.8-.3 5.6 5.6 0 0 1-2.3-1.8 5.7 5.7 0 0 1-.9-1.6 6.5 6.5 0 0 1-.2-2.8 7.3 7.3 0 0 1 .5-2l.3-.3.8-.9.3-.3c.2-.2.5-.3.8-.3H120.7c.2 0 .3-.1.4 0h.4l.2.1.3.2.2-.4.3-.4.1-.1 1.2-1 .3-.2.4-.1.4-.1h.3l1.5.1.4.1.8.5.1.2 1 1.1v.2H129.4l.4-.2 1.4-.5h1.1c.3 0 .7.2 1 .4.2 0 .3.2.5.3l.2.2.5.3.4.6.1.3.4 1.4.1.4v.6a7.8 7.8 0 0 1-.1.6 9.9 9.9 0 0 1-.8 2.4 7.8 7.8 0 0 1-3 3.3 6.4 6.4 0 0 1-1 .5 6.1 6.1 0 0 1-.6.2l-.7.1h-.1a23.4 23.4 0 0 1-.2 1.7 14.3 14.3 0 0 1-.6 2.1l-.8 2a9.2 9.2 0 0 1-.4.6l-.7 1a9.1 9.1 0 0 1-2.3 2.2c-.9.5-2 .6-3 .7l-1.4.1h-.5l-.4.1a15.8 15.8 0 0 1-2.8-.1v4.2a9.7 9.7 0 0 1-.7 3.5 9.6 9.6 0 0 1-1.7 2.8 9.3 9.3 0 0 1-3 2.3 9 9 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