ExceptionHandler.php 32 KB

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  1. <?php
  2. /*
  3. * This file is part of the Symfony package.
  4. *
  5. * (c) Fabien Potencier <fabien@symfony.com>
  6. *
  7. * For the full copyright and license information, please view the LICENSE
  8. * file that was distributed with this source code.
  9. */
  10. namespace Symfony\Component\Debug;
  11. use Symfony\Component\Debug\Exception\FlattenException;
  12. use Symfony\Component\Debug\Exception\OutOfMemoryException;
  13. use Symfony\Component\HttpKernel\Debug\FileLinkFormatter;
  14. /**
  15. * ExceptionHandler converts an exception to a Response object.
  16. *
  17. * It is mostly useful in debug mode to replace the default PHP/XDebug
  18. * output with something prettier and more useful.
  19. *
  20. * As this class is mainly used during Kernel boot, where nothing is yet
  21. * available, the Response content is always HTML.
  22. *
  23. * @author Fabien Potencier <fabien@symfony.com>
  24. * @author Nicolas Grekas <p@tchwork.com>
  25. */
  26. class ExceptionHandler
  27. {
  28. private $debug;
  29. private $charset;
  30. private $handler;
  31. private $caughtBuffer;
  32. private $caughtLength;
  33. private $fileLinkFormat;
  34. public function __construct($debug = true, $charset = null, $fileLinkFormat = null)
  35. {
  36. $this->debug = $debug;
  37. $this->charset = $charset ?: ini_get('default_charset') ?: 'UTF-8';
  38. $this->fileLinkFormat = $fileLinkFormat ?: ini_get('xdebug.file_link_format') ?: get_cfg_var('xdebug.file_link_format');
  39. }
  40. /**
  41. * Registers the exception handler.
  42. *
  43. * @param bool $debug Enable/disable debug mode, where the stack trace is displayed
  44. * @param string|null $charset The charset used by exception messages
  45. * @param string|null $fileLinkFormat The IDE link template
  46. *
  47. * @return static
  48. */
  49. public static function register($debug = true, $charset = null, $fileLinkFormat = null)
  50. {
  51. $handler = new static($debug, $charset, $fileLinkFormat);
  52. $prev = set_exception_handler(array($handler, 'handle'));
  53. if (is_array($prev) && $prev[0] instanceof ErrorHandler) {
  54. restore_exception_handler();
  55. $prev[0]->setExceptionHandler(array($handler, 'handle'));
  56. }
  57. return $handler;
  58. }
  59. /**
  60. * Sets a user exception handler.
  61. *
  62. * @param callable $handler An handler that will be called on Exception
  63. *
  64. * @return callable|null The previous exception handler if any
  65. */
  66. public function setHandler(callable $handler = null)
  67. {
  68. $old = $this->handler;
  69. $this->handler = $handler;
  70. return $old;
  71. }
  72. /**
  73. * Sets the format for links to source files.
  74. *
  75. * @param string|FileLinkFormatter $fileLinkFormat The format for links to source files
  76. *
  77. * @return string The previous file link format
  78. */
  79. public function setFileLinkFormat($fileLinkFormat)
  80. {
  81. $old = $this->fileLinkFormat;
  82. $this->fileLinkFormat = $fileLinkFormat;
  83. return $old;
  84. }
  85. /**
  86. * Sends a response for the given Exception.
  87. *
  88. * To be as fail-safe as possible, the exception is first handled
  89. * by our simple exception handler, then by the user exception handler.
  90. * The latter takes precedence and any output from the former is cancelled,
  91. * if and only if nothing bad happens in this handling path.
  92. */
  93. public function handle(\Exception $exception)
  94. {
  95. if (null === $this->handler || $exception instanceof OutOfMemoryException) {
  96. $this->sendPhpResponse($exception);
  97. return;
  98. }
  99. $caughtLength = $this->caughtLength = 0;
  100. ob_start(function ($buffer) {
  101. $this->caughtBuffer = $buffer;
  102. return '';
  103. });
  104. $this->sendPhpResponse($exception);
  105. while (null === $this->caughtBuffer && ob_end_flush()) {
  106. // Empty loop, everything is in the condition
  107. }
  108. if (isset($this->caughtBuffer[0])) {
  109. ob_start(function ($buffer) {
  110. if ($this->caughtLength) {
  111. // use substr_replace() instead of substr() for mbstring overloading resistance
  112. $cleanBuffer = substr_replace($buffer, '', 0, $this->caughtLength);
  113. if (isset($cleanBuffer[0])) {
  114. $buffer = $cleanBuffer;
  115. }
  116. }
  117. return $buffer;
  118. });
  119. echo $this->caughtBuffer;
  120. $caughtLength = ob_get_length();
  121. }
  122. $this->caughtBuffer = null;
  123. try {
  124. call_user_func($this->handler, $exception);
  125. $this->caughtLength = $caughtLength;
  126. } catch (\Exception $e) {
  127. if (!$caughtLength) {
  128. // All handlers failed. Let PHP handle that now.
  129. throw $exception;
  130. }
  131. }
  132. }
  133. /**
  134. * Sends the error associated with the given Exception as a plain PHP response.
  135. *
  136. * This method uses plain PHP functions like header() and echo to output
  137. * the response.
  138. *
  139. * @param \Exception|FlattenException $exception An \Exception or FlattenException instance
  140. */
  141. public function sendPhpResponse($exception)
  142. {
  143. if (!$exception instanceof FlattenException) {
  144. $exception = FlattenException::create($exception);
  145. }
  146. if (!headers_sent()) {
  147. header(sprintf('HTTP/1.0 %s', $exception->getStatusCode()));
  148. foreach ($exception->getHeaders() as $name => $value) {
  149. header($name.': '.$value, false);
  150. }
  151. header('Content-Type: text/html; charset='.$this->charset);
  152. }
  153. echo $this->decorate($this->getContent($exception), $this->getStylesheet($exception));
  154. }
  155. /**
  156. * Gets the full HTML content associated with the given exception.
  157. *
  158. * @param \Exception|FlattenException $exception An \Exception or FlattenException instance
  159. *
  160. * @return string The HTML content as a string
  161. */
  162. public function getHtml($exception)
  163. {
  164. if (!$exception instanceof FlattenException) {
  165. $exception = FlattenException::create($exception);
  166. }
  167. return $this->decorate($this->getContent($exception), $this->getStylesheet($exception));
  168. }
  169. /**
  170. * Gets the HTML content associated with the given exception.
  171. *
  172. * @param FlattenException $exception A FlattenException instance
  173. *
  174. * @return string The content as a string
  175. */
  176. public function getContent(FlattenException $exception)
  177. {
  178. switch ($exception->getStatusCode()) {
  179. case 404:
  180. $title = 'Sorry, the page you are looking for could not be found.';
  181. break;
  182. default:
  183. $title = 'Whoops, looks like something went wrong.';
  184. }
  185. $content = '';
  186. if ($this->debug) {
  187. try {
  188. $count = count($exception->getAllPrevious());
  189. $total = $count + 1;
  190. foreach ($exception->toArray() as $position => $e) {
  191. $ind = $count - $position + 1;
  192. $class = $this->formatClass($e['class']);
  193. $message = nl2br($this->escapeHtml($e['message']));
  194. $content .= sprintf(<<<'EOF'
  195. <div class="trace trace-as-html">
  196. <table class="trace-details">
  197. <thead class="trace-head"><tr><th>
  198. <h3 class="trace-class">
  199. <span class="text-muted">(%d/%d)</span>
  200. <span class="exception_title">%s</span>
  201. </h3>
  202. <p class="break-long-words trace-message">%s</p>
  203. </th></tr></thead>
  204. <tbody>
  205. EOF
  206. , $ind, $total, $class, $message);
  207. foreach ($e['trace'] as $trace) {
  208. $content .= '<tr><td>';
  209. if ($trace['function']) {
  210. $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']));
  211. }
  212. if (isset($trace['file']) && isset($trace['line'])) {
  213. $content .= $this->formatPath($trace['file'], $trace['line']);
  214. }
  215. $content .= "</td></tr>\n";
  216. }
  217. $content .= "</tbody>\n</table>\n</div>\n";
  218. }
  219. } catch (\Exception $e) {
  220. // something nasty happened and we cannot throw an exception anymore
  221. if ($this->debug) {
  222. $title = sprintf('Exception thrown when handling an exception (%s: %s)', get_class($e), $this->escapeHtml($e->getMessage()));
  223. } else {
  224. $title = 'Whoops, looks like something went wrong.';
  225. }
  226. }
  227. }
  228. $symfonyGhostImageContents = $this->getSymfonyGhostAsSvg();
  229. return <<<EOF
  230. <div class="exception-summary">
  231. <div class="container">
  232. <div class="exception-message-wrapper">
  233. <h1 class="break-long-words exception-message">$title</h1>
  234. <div class="exception-illustration hidden-xs-down">$symfonyGhostImageContents</div>
  235. </div>
  236. </div>
  237. </div>
  238. <div class="container">
  239. $content
  240. </div>
  241. EOF;
  242. }
  243. /**
  244. * Gets the stylesheet associated with the given exception.
  245. *
  246. * @param FlattenException $exception A FlattenException instance
  247. *
  248. * @return string The stylesheet as a string
  249. */
  250. public function getStylesheet(FlattenException $exception)
  251. {
  252. return <<<'EOF'
  253. body { background-color: #F9F9F9; color: #222; font: 14px/1.4 Helvetica, Arial, sans-serif; margin: 0; padding-bottom: 45px; }
  254. a { cursor: pointer; text-decoration: none; }
  255. a:hover { text-decoration: underline; }
  256. abbr[title] { border-bottom: none; cursor: help; text-decoration: none; }
  257. code, pre { font: 13px/1.5 Consolas, Monaco, Menlo, "Ubuntu Mono", "Liberation Mono", monospace; }
  258. table, tr, th, td { background: #FFF; border-collapse: collapse; vertical-align: top; }
  259. table { background: #FFF; border: 1px solid #E0E0E0; box-shadow: 0px 0px 1px rgba(128, 128, 128, .2); margin: 1em 0; width: 100%; }
  260. table th, table td { border: solid #E0E0E0; border-width: 1px 0; padding: 8px 10px; }
  261. table th { background-color: #E0E0E0; font-weight: bold; text-align: left; }
  262. .hidden-xs-down { display: none; }
  263. .block { display: block; }
  264. .break-long-words { -ms-word-break: break-all; word-break: break-all; word-break: break-word; -webkit-hyphens: auto; -moz-hyphens: auto; hyphens: auto; }
  265. .text-muted { color: #999; }
  266. .container { max-width: 1024px; margin: 0 auto; padding: 0 15px; }
  267. .container::after { content: ""; display: table; clear: both; }
  268. .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; }
  269. .exception-message-wrapper { display: flex; align-items: center; min-height: 70px; }
  270. .exception-message { flex-grow: 1; padding: 30px 0; }
  271. .exception-message, .exception-message a { color: #FFF; font-size: 21px; font-weight: 400; margin: 0; }
  272. .exception-message.long { font-size: 18px; }
  273. .exception-message a { text-decoration: none; }
  274. .exception-message a:hover { text-decoration: underline; }
  275. .exception-illustration { flex-basis: 111px; flex-shrink: 0; height: 66px; margin-left: 15px; opacity: .7; }
  276. .trace + .trace { margin-top: 30px; }
  277. .trace-head .trace-class { color: #222; font-size: 18px; font-weight: bold; line-height: 1.3; margin: 0; position: relative; }
  278. .trace-message { font-size: 14px; font-weight: normal; margin: .5em 0 0; }
  279. .trace-file-path, .trace-file-path a { margin-top: 3px; color: #999; color: #795da3; color: #B0413E; color: #222; font-size: 13px; }
  280. .trace-class { color: #B0413E; }
  281. .trace-type { padding: 0 2px; }
  282. .trace-method { color: #B0413E; color: #222; font-weight: bold; color: #B0413E; }
  283. .trace-arguments { color: #222; color: #999; font-weight: normal; color: #795da3; color: #777; padding-left: 2px; }
  284. @media (min-width: 575px) {
  285. .hidden-xs-down { display: initial; }
  286. }
  287. EOF;
  288. }
  289. private function decorate($content, $css)
  290. {
  291. return <<<EOF
  292. <!DOCTYPE html>
  293. <html>
  294. <head>
  295. <meta charset="{$this->charset}" />
  296. <meta name="robots" content="noindex,nofollow" />
  297. <style>$css</style>
  298. </head>
  299. <body>
  300. $content
  301. </body>
  302. </html>
  303. EOF;
  304. }
  305. private function formatClass($class)
  306. {
  307. $parts = explode('\\', $class);
  308. return sprintf('<abbr title="%s">%s</abbr>', $class, array_pop($parts));
  309. }
  310. private function formatPath($path, $line)
  311. {
  312. $file = $this->escapeHtml(preg_match('#[^/\\\\]*+$#', $path, $file) ? $file[0] : $path);
  313. $fmt = $this->fileLinkFormat;
  314. if ($fmt && $link = is_string($fmt) ? strtr($fmt, array('%f' => $path, '%l' => $line)) : $fmt->format($path, $line)) {
  315. return sprintf('<span class="block trace-file-path">in <a href="%s" title="Go to source">%s (line %d)</a></span>', $this->escapeHtml($link), $file, $line);
  316. }
  317. return sprintf('<span class="block trace-file-path">in <a title="%s line %3$d"><strong>%s</strong> (line %d)</a></span>', $this->escapeHtml($path), $file, $line);
  318. }
  319. /**
  320. * Formats an array as a string.
  321. *
  322. * @param array $args The argument array
  323. *
  324. * @return string
  325. */
  326. private function formatArgs(array $args)
  327. {
  328. $result = array();
  329. foreach ($args as $key => $item) {
  330. if ('object' === $item[0]) {
  331. $formattedValue = sprintf('<em>object</em>(%s)', $this->formatClass($item[1]));
  332. } elseif ('array' === $item[0]) {
  333. $formattedValue = sprintf('<em>array</em>(%s)', is_array($item[1]) ? $this->formatArgs($item[1]) : $item[1]);
  334. } elseif ('null' === $item[0]) {
  335. $formattedValue = '<em>null</em>';
  336. } elseif ('boolean' === $item[0]) {
  337. $formattedValue = '<em>'.strtolower(var_export($item[1], true)).'</em>';
  338. } elseif ('resource' === $item[0]) {
  339. $formattedValue = '<em>resource</em>';
  340. } else {
  341. $formattedValue = str_replace("\n", '', $this->escapeHtml(var_export($item[1], true)));
  342. }
  343. $result[] = is_int($key) ? $formattedValue : sprintf("'%s' => %s", $key, $formattedValue);
  344. }
  345. return implode(', ', $result);
  346. }
  347. /**
  348. * HTML-encodes a string.
  349. */
  350. private function escapeHtml($str)
  351. {
  352. return htmlspecialchars($str, ENT_COMPAT | ENT_SUBSTITUTE, $this->charset);
  353. }
  354. private function getSymfonyGhostAsSvg()
  355. {
  356. 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="1.414"><path d="M92.358 20.403a23.168 23.168 0 0 1 9.003 1.881 23.67 23.67 0 0 1 5.197 3.079 24.257 24.257 0 0 1 3.457 3.296 24.771 24.771 0 0 1 5.042 9.396c.486 1.72.78 3.492.895 5.28l.008.142.028.158.015.246v13.875c.116.034.232.065.348.098.193.054.383.116.577.168.487.125.989.191 1.49.215.338.016.689.023 1.021-.059.021-.005.032-.029.048-.044l.095-.1c.243-.265.461-.552.663-.851.277-.408.523-.837.746-1.279l.042-.087c-.066-.012-.131-.026-.197-.04l-.099-.023a5.536 5.536 0 0 1-.694-.242 5.649 5.649 0 0 1-2.374-1.845 5.694 5.694 0 0 1-.824-1.594 6.514 6.514 0 0 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