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/vendor/symfony/debug/ -> ExceptionHandler.php (source)

   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\Debug;
  13  
  14  use Symfony\Component\Debug\Exception\FlattenException;
  15  use Symfony\Component\Debug\Exception\OutOfMemoryException;
  16  use Symfony\Component\HttpKernel\Debug\FileLinkFormatter;
  17  
  18  /**
  19   * ExceptionHandler converts an exception to a Response object.
  20   *
  21   * It is mostly useful in debug mode to replace the default PHP/XDebug
  22   * output with something prettier and more useful.
  23   *
  24   * As this class is mainly used during Kernel boot, where nothing is yet
  25   * available, the Response content is always HTML.
  26   *
  27   * @author Fabien Potencier <fabien@symfony.com>
  28   * @author Nicolas Grekas <p@tchwork.com>
  29   */
  30  class ExceptionHandler
  31  {
  32      private $debug;
  33      private $charset;
  34      private $handler;
  35      private $caughtBuffer;
  36      private $caughtLength;
  37      private $fileLinkFormat;
  38  
  39      public function __construct($debug = true, $charset = null, $fileLinkFormat = null)
  40      {
  41          $this->debug = $debug;
  42          $this->charset = $charset ?: ini_get('default_charset') ?: 'UTF-8';
  43          $this->fileLinkFormat = $fileLinkFormat;
  44      }
  45  
  46      /**
  47       * Registers the exception handler.
  48       *
  49       * @param bool        $debug          Enable/disable debug mode, where the stack trace is displayed
  50       * @param string|null $charset        The charset used by exception messages
  51       * @param string|null $fileLinkFormat The IDE link template
  52       *
  53       * @return static
  54       */
  55      public static function register($debug = true, $charset = null, $fileLinkFormat = null)
  56      {
  57          $handler = new static($debug, $charset, $fileLinkFormat);
  58  
  59          $prev = set_exception_handler([$handler, 'handle']);
  60          if (\is_array($prev) && $prev[0] instanceof ErrorHandler) {
  61              restore_exception_handler();
  62              $prev[0]->setExceptionHandler([$handler, 'handle']);
  63          }
  64  
  65          return $handler;
  66      }
  67  
  68      /**
  69       * Sets a user exception handler.
  70       *
  71       * @param callable $handler An handler that will be called on Exception
  72       *
  73       * @return callable|null The previous exception handler if any
  74       */
  75      public function setHandler(callable $handler = null)
  76      {
  77          $old = $this->handler;
  78          $this->handler = $handler;
  79  
  80          return $old;
  81      }
  82  
  83      /**
  84       * Sets the format for links to source files.
  85       *
  86       * @param string|FileLinkFormatter $fileLinkFormat The format for links to source files
  87       *
  88       * @return string The previous file link format
  89       */
  90      public function setFileLinkFormat($fileLinkFormat)
  91      {
  92          $old = $this->fileLinkFormat;
  93          $this->fileLinkFormat = $fileLinkFormat;
  94  
  95          return $old;
  96      }
  97  
  98      /**
  99       * Sends a response for the given Exception.
 100       *
 101       * To be as fail-safe as possible, the exception is first handled
 102       * by our simple exception handler, then by the user exception handler.
 103       * The latter takes precedence and any output from the former is cancelled,
 104       * if and only if nothing bad happens in this handling path.
 105       */
 106      public function handle(\Exception $exception)
 107      {
 108          if (null === $this->handler || $exception instanceof OutOfMemoryException) {
 109              $this->sendPhpResponse($exception);
 110  
 111              return;
 112          }
 113  
 114          $caughtLength = $this->caughtLength = 0;
 115  
 116          ob_start(function ($buffer) {
 117              $this->caughtBuffer = $buffer;
 118  
 119              return '';
 120          });
 121  
 122          $this->sendPhpResponse($exception);
 123          while (null === $this->caughtBuffer && ob_end_flush()) {
 124              // Empty loop, everything is in the condition
 125          }
 126          if (isset($this->caughtBuffer[0])) {
 127              ob_start(function ($buffer) {
 128                  if ($this->caughtLength) {
 129                      // use substr_replace() instead of substr() for mbstring overloading resistance
 130                      $cleanBuffer = substr_replace($buffer, '', 0, $this->caughtLength);
 131                      if (isset($cleanBuffer[0])) {
 132                          $buffer = $cleanBuffer;
 133                      }
 134                  }
 135  
 136                  return $buffer;
 137              });
 138  
 139              echo $this->caughtBuffer;
 140              $caughtLength = ob_get_length();
 141          }
 142          $this->caughtBuffer = null;
 143  
 144          try {
 145              \call_user_func($this->handler, $exception);
 146              $this->caughtLength = $caughtLength;
 147          } catch (\Exception $e) {
 148              if (!$caughtLength) {
 149                  // All handlers failed. Let PHP handle that now.
 150                  throw $exception;
 151              }
 152          }
 153      }
 154  
 155      /**
 156       * Sends the error associated with the given Exception as a plain PHP response.
 157       *
 158       * This method uses plain PHP functions like header() and echo to output
 159       * the response.
 160       *
 161       * @param \Exception|FlattenException $exception An \Exception or FlattenException instance
 162       */
 163      public function sendPhpResponse($exception)
 164      {
 165          if (!$exception instanceof FlattenException) {
 166              $exception = FlattenException::create($exception);
 167          }
 168  
 169          if (!headers_sent()) {
 170              header(sprintf('HTTP/1.0 %s', $exception->getStatusCode()));
 171              foreach ($exception->getHeaders() as $name => $value) {
 172                  header($name.': '.$value, false);
 173              }
 174              header('Content-Type: text/html; charset='.$this->charset);
 175          }
 176  
 177          echo $this->decorate($this->getContent($exception), $this->getStylesheet($exception));
 178      }
 179  
 180      /**
 181       * Gets the full HTML content associated with the given exception.
 182       *
 183       * @param \Exception|FlattenException $exception An \Exception or FlattenException instance
 184       *
 185       * @return string The HTML content as a string
 186       */
 187      public function getHtml($exception)
 188      {
 189          if (!$exception instanceof FlattenException) {
 190              $exception = FlattenException::create($exception);
 191          }
 192  
 193          return $this->decorate($this->getContent($exception), $this->getStylesheet($exception));
 194      }
 195  
 196      /**
 197       * Gets the HTML content associated with the given exception.
 198       *
 199       * @return string The content as a string
 200       */
 201      public function getContent(FlattenException $exception)
 202      {
 203          switch ($exception->getStatusCode()) {
 204              case 404:
 205                  $title = 'Sorry, the page you are looking for could not be found.';
 206                  break;
 207              default:
 208                  $title = 'Whoops, looks like something went wrong.';
 209          }
 210  
 211          if (!$this->debug) {
 212              return <<<EOF
 213                  <div class="container">
 214                      <h1>$title</h1>
 215                  </div>
 216  EOF;
 217          }
 218  
 219          $content = '';
 220          try {
 221              $count = \count($exception->getAllPrevious());
 222              $total = $count + 1;
 223              foreach ($exception->toArray() as $position => $e) {
 224                  $ind = $count - $position + 1;
 225                  $class = $this->formatClass($e['class']);
 226                  $message = nl2br($this->escapeHtml($e['message']));
 227                  $content .= sprintf(<<<'EOF'
 228                      <div class="trace trace-as-html">
 229                          <table class="trace-details">
 230                              <thead class="trace-head"><tr><th>
 231                                  <h3 class="trace-class">
 232                                      <span class="text-muted">(%d/%d)</span>
 233                                      <span class="exception_title">%s</span>
 234                                  </h3>
 235                                  <p class="break-long-words trace-message">%s</p>
 236                              </th></tr></thead>
 237                              <tbody>
 238  EOF
 239                      , $ind, $total, $class, $message);
 240                  foreach ($e['trace'] as $trace) {
 241                      $content .= '<tr><td>';
 242                      if ($trace['function']) {
 243                          $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']));
 244                      }
 245                      if (isset($trace['file']) && isset($trace['line'])) {
 246                          $content .= $this->formatPath($trace['file'], $trace['line']);
 247                      }
 248                      $content .= "</td></tr>\n";
 249                  }
 250  
 251                  $content .= "</tbody>\n</table>\n</div>\n";
 252              }
 253          } catch (\Exception $e) {
 254              // something nasty happened and we cannot throw an exception anymore
 255              if ($this->debug) {
 256                  $title = sprintf('Exception thrown when handling an exception (%s: %s)', \get_class($e), $this->escapeHtml($e->getMessage()));
 257              } else {
 258                  $title = 'Whoops, looks like something went wrong.';
 259              }
 260          }
 261  
 262          $symfonyGhostImageContents = $this->getSymfonyGhostAsSvg();
 263  
 264          return <<<EOF
 265              <div class="exception-summary">
 266                  <div class="container">
 267                      <div class="exception-message-wrapper">
 268                          <h1 class="break-long-words exception-message">$title</h1>
 269                          <div class="exception-illustration hidden-xs-down">$symfonyGhostImageContents</div>
 270                      </div>
 271                  </div>
 272              </div>
 273  
 274              <div class="container">
 275                  $content
 276              </div>
 277  EOF;
 278      }
 279  
 280      /**
 281       * Gets the stylesheet associated with the given exception.
 282       *
 283       * @return string The stylesheet as a string
 284       */
 285      public function getStylesheet(FlattenException $exception)
 286      {
 287          if (!$this->debug) {
 288              return <<<'EOF'
 289                  body { background-color: #fff; color: #222; font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; margin: 0; }
 290                  .container { margin: 30px; max-width: 600px; }
 291                  h1 { color: #dc3545; font-size: 24px; }
 292  EOF;
 293          }
 294  
 295          return <<<'EOF'
 296              body { background-color: #F9F9F9; color: #222; font: 14px/1.4 Helvetica, Arial, sans-serif; margin: 0; padding-bottom: 45px; }
 297  
 298              a { cursor: pointer; text-decoration: none; }
 299              a:hover { text-decoration: underline; }
 300              abbr[title] { border-bottom: none; cursor: help; text-decoration: none; }
 301  
 302              code, pre { font: 13px/1.5 Consolas, Monaco, Menlo, "Ubuntu Mono", "Liberation Mono", monospace; }
 303  
 304              table, tr, th, td { background: #FFF; border-collapse: collapse; vertical-align: top; }
 305              table { background: #FFF; border: 1px solid #E0E0E0; box-shadow: 0px 0px 1px rgba(128, 128, 128, .2); margin: 1em 0; width: 100%; }
 306              table th, table td { border: solid #E0E0E0; border-width: 1px 0; padding: 8px 10px; }
 307              table th { background-color: #E0E0E0; font-weight: bold; text-align: left; }
 308  
 309              .hidden-xs-down { display: none; }
 310              .block { display: block; }
 311              .break-long-words { -ms-word-break: break-all; word-break: break-all; word-break: break-word; -webkit-hyphens: auto; -moz-hyphens: auto; hyphens: auto; }
 312              .text-muted { color: #999; }
 313  
 314              .container { max-width: 1024px; margin: 0 auto; padding: 0 15px; }
 315              .container::after { content: ""; display: table; clear: both; }
 316  
 317              .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; }
 318  
 319              .exception-message-wrapper { display: flex; align-items: center; min-height: 70px; }
 320              .exception-message { flex-grow: 1; padding: 30px 0; }
 321              .exception-message, .exception-message a { color: #FFF; font-size: 21px; font-weight: 400; margin: 0; }
 322              .exception-message.long { font-size: 18px; }
 323              .exception-message a { border-bottom: 1px solid rgba(255, 255, 255, 0.5); font-size: inherit; text-decoration: none; }
 324              .exception-message a:hover { border-bottom-color: #ffffff; }
 325  
 326              .exception-illustration { flex-basis: 111px; flex-shrink: 0; height: 66px; margin-left: 15px; opacity: .7; }
 327  
 328              .trace + .trace { margin-top: 30px; }
 329              .trace-head .trace-class { color: #222; font-size: 18px; font-weight: bold; line-height: 1.3; margin: 0; position: relative; }
 330  
 331              .trace-message { font-size: 14px; font-weight: normal; margin: .5em 0 0; }
 332  
 333              .trace-file-path, .trace-file-path a { color: #222; margin-top: 3px; font-size: 13px; }
 334              .trace-class { color: #B0413E; }
 335              .trace-type { padding: 0 2px; }
 336              .trace-method { color: #B0413E; font-weight: bold; }
 337              .trace-arguments { color: #777; font-weight: normal; padding-left: 2px; }
 338  
 339              @media (min-width: 575px) {
 340                  .hidden-xs-down { display: initial; }
 341              }
 342  EOF;
 343      }
 344  
 345      private function decorate($content, $css)
 346      {
 347          return <<<EOF
 348  <!DOCTYPE html>
 349  <html>
 350      <head>
 351          <meta charset="{$this->charset}" />
 352          <meta name="robots" content="noindex,nofollow" />
 353          <style>$css</style>
 354      </head>
 355      <body>
 356          $content
 357      </body>
 358  </html>
 359  EOF;
 360      }
 361  
 362      private function formatClass($class)
 363      {
 364          $parts = explode('\\', $class);
 365  
 366          return sprintf('<abbr title="%s">%s</abbr>', $class, array_pop($parts));
 367      }
 368  
 369      private function formatPath($path, $line)
 370      {
 371          $file = $this->escapeHtml(preg_match('#[^/\\\\]*+$#', $path, $file) ? $file[0] : $path);
 372          $fmt = $this->fileLinkFormat ?: ini_get('xdebug.file_link_format') ?: get_cfg_var('xdebug.file_link_format');
 373  
 374          if (!$fmt) {
 375              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 : '');
 376          }
 377  
 378          if (\is_string($fmt)) {
 379              $i = strpos($f = $fmt, '&', max(strrpos($f, '%f'), strrpos($f, '%l'))) ?: \strlen($f);
 380              $fmt = [substr($f, 0, $i)] + preg_split('/&([^>]++)>/', substr($f, $i), -1, PREG_SPLIT_DELIM_CAPTURE);
 381  
 382              for ($i = 1; isset($fmt[$i]); ++$i) {
 383                  if (0 === strpos($path, $k = $fmt[$i++])) {
 384                      $path = substr_replace($path, $fmt[$i], 0, \strlen($k));
 385                      break;
 386                  }
 387              }
 388  
 389              $link = strtr($fmt[0], ['%f' => $path, '%l' => $line]);
 390          } else {
 391              try {
 392                  $link = $fmt->format($path, $line);
 393              } catch (\Exception $e) {
 394                  return sprintf('<span class="block trace-file-path">in <span title="%s%3$s"><strong>%s</strong>%s</span></span>', $this->escapeHtml($path), $file, 0 < $line ? ' line '.$line : '');
 395              }
 396          }
 397  
 398          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 : '');
 399      }
 400  
 401      /**
 402       * Formats an array as a string.
 403       *
 404       * @param array $args The argument array
 405       *
 406       * @return string
 407       */
 408      private function formatArgs(array $args)
 409      {
 410          $result = [];
 411          foreach ($args as $key => $item) {
 412              if ('object' === $item[0]) {
 413                  $formattedValue = sprintf('<em>object</em>(%s)', $this->formatClass($item[1]));
 414              } elseif ('array' === $item[0]) {
 415                  $formattedValue = sprintf('<em>array</em>(%s)', \is_array($item[1]) ? $this->formatArgs($item[1]) : $item[1]);
 416              } elseif ('null' === $item[0]) {
 417                  $formattedValue = '<em>null</em>';
 418              } elseif ('boolean' === $item[0]) {
 419                  $formattedValue = '<em>'.strtolower(var_export($item[1], true)).'</em>';
 420              } elseif ('resource' === $item[0]) {
 421                  $formattedValue = '<em>resource</em>';
 422              } else {
 423                  $formattedValue = str_replace("\n", '', $this->escapeHtml(var_export($item[1], true)));
 424              }
 425  
 426              $result[] = \is_int($key) ? $formattedValue : sprintf("'%s' => %s", $this->escapeHtml($key), $formattedValue);
 427          }
 428  
 429          return implode(', ', $result);
 430      }
 431  
 432      /**
 433       * HTML-encodes a string.
 434       */
 435      private function escapeHtml($str)
 436      {
 437          return htmlspecialchars($str, ENT_COMPAT | ENT_SUBSTITUTE, $this->charset);
 438      }
 439  
 440      private function getSymfonyGhostAsSvg()
 441      {
 442          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 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