PHPXRef 0.7.1 : DokuWiki : /inc/ErrorHandler.php source

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   1  <?php
   2  
   3  namespace dokuwiki;
   4  
   5  use dokuwiki\Exception\FatalException;
   6  
   7  /**
   8   * Manage the global handling of errors and exceptions
   9   *
  10   * Developer may use this to log and display exceptions themselves
  11   */
  12  class ErrorHandler
  13  {
  14      /**
  15       * Standard error codes used in PHP errors
  16       * @see https://www.php.net/manual/en/errorfunc.constants.php
  17       */
  18      const ERRORCODES = [
  19          1 => 'E_ERROR',
  20          2 => 'E_WARNING',
  21          4 => 'E_PARSE',
  22          8 => 'E_NOTICE',
  23          16 => 'E_CORE_ERROR',
  24          32 => 'E_CORE_WARNING',
  25          64 => 'E_COMPILE_ERROR',
  26          128 => 'E_COMPILE_WARNING',
  27          256 => 'E_USER_ERROR',
  28          512 => 'E_USER_WARNING',
  29          1024 => 'E_USER_NOTICE',
  30          2048 => 'E_STRICT',
  31          4096 => 'E_RECOVERABLE_ERROR',
  32          8192 => 'E_DEPRECATED',
  33          16384 => 'E_USER_DEPRECATED',
  34      ];
  35  
  36      /**
  37       * Register the default error handling
  38       */
  39      public static function register()
  40      {
  41          if (!defined('DOKU_UNITTEST')) {
  42              set_exception_handler([ErrorHandler::class, 'fatalException']);
  43              register_shutdown_function([ErrorHandler::class, 'fatalShutdown']);
  44              set_error_handler(
  45                  [ErrorHandler::class, 'errorHandler'],
  46                  E_WARNING|E_USER_ERROR|E_USER_WARNING|E_RECOVERABLE_ERROR
  47              );
  48          }
  49      }
  50  
  51      /**
  52       * Default Exception handler to show a nice user message before dieing
  53       *
  54       * The exception is logged to the error log
  55       *
  56       * @param \Throwable $e
  57       */
  58      public static function fatalException($e)
  59      {
  60          $plugin = self::guessPlugin($e);
  61          $title = hsc(get_class($e) . ': ' . $e->getMessage());
  62          $msg = 'An unforeseen error has occured. This is most likely a bug somewhere.';
  63          if ($plugin) $msg .= ' It might be a problem in the ' . $plugin . ' plugin.';
  64          $logged = self::logException($e)
  65              ? 'More info has been written to the DokuWiki error log.'
  66              : $e->getFile() . ':' . $e->getLine();
  67  
  68          echo <<<EOT
  69  <!DOCTYPE html>
  70  <html>
  71  <head><title>$title</title></head>
  72  <body style="font-family: Arial, sans-serif">
  73      <div style="width:60%; margin: auto; background-color: #fcc;
  74                  border: 1px solid #faa; padding: 0.5em 1em;">
  75          <h1 style="font-size: 120%">$title</h1>
  76          <p>$msg</p>
  77          <p>$logged</p>
  78      </div>
  79  </body>
  80  </html>
  81  EOT;
  82      }
  83  
  84      /**
  85       * Convenience method to display an error message for the given Exception
  86       *
  87       * @param \Throwable $e
  88       * @param string $intro
  89       */
  90      public static function showExceptionMsg($e, $intro = 'Error!')
  91      {
  92          $msg = hsc($intro) . '<br />' . hsc(get_class($e) . ': ' . $e->getMessage());
  93          if (self::logException($e)) $msg .= '<br />More info is available in the error log.';
  94          msg($msg, -1);
  95      }
  96  
  97      /**
  98       * Last resort to handle fatal errors that still can't be caught
  99       */
 100      public static function fatalShutdown()
 101      {
 102          $error = error_get_last();
 103          // Check if it's a core/fatal error, otherwise it's a normal shutdown
 104          if (
 105              $error !== null &&
 106              in_array(
 107                  $error['type'],
 108                  [
 109                      E_ERROR,
 110                      E_CORE_ERROR,
 111                      E_COMPILE_ERROR,
 112                  ]
 113              )
 114          ) {
 115              self::fatalException(
 116                  new FatalException($error['message'], 0, $error['type'], $error['file'], $error['line'])
 117              );
 118          }
 119      }
 120  
 121      /**
 122       * Log the given exception to the error log
 123       *
 124       * @param \Throwable $e
 125       * @return bool false if the logging failed
 126       */
 127      public static function logException($e)
 128      {
 129          if (is_a($e, \ErrorException::class)) {
 130              $prefix = self::ERRORCODES[$e->getSeverity()];
 131          } else {
 132              $prefix = get_class($e);
 133          }
 134  
 135          return Logger::getInstance()->log(
 136              $prefix . ': ' . $e->getMessage(),
 137              $e->getTraceAsString(),
 138              $e->getFile(),
 139              $e->getLine()
 140          );
 141      }
 142  
 143      /**
 144       * Error handler to log non-exception errors
 145       *
 146       * @param int $errno
 147       * @param string $errstr
 148       * @param string $errfile
 149       * @param int $errline
 150       * @return bool
 151       */
 152      public static function errorHandler($errno, $errstr, $errfile, $errline)
 153      {
 154          global $conf;
 155  
 156          // ignore supressed warnings
 157          if (!(error_reporting() & $errno)) return false;
 158  
 159          $ex = new \ErrorException(
 160              $errstr,
 161              0,
 162              $errno,
 163              $errfile,
 164              $errline
 165          );
 166          self::logException($ex);
 167  
 168          if($ex->getSeverity() === E_WARNING && $conf['hidewarnings']) {
 169              return true;
 170          }
 171  
 172          return false;
 173      }
 174  
 175      /**
 176       * Checks the the stacktrace for plugin files
 177       *
 178       * @param \Throwable $e
 179       * @return false|string
 180       */
 181      protected static function guessPlugin($e)
 182      {
 183          if (preg_match('/lib\/plugins\/(\w+)\//', str_replace('\\', '/', $e->getFile()), $match)) {
 184              return $match[1];
 185          }
 186  
 187          foreach ($e->getTrace() as $line) {
 188              if (
 189                  isset($line['class']) &&
 190                  preg_match('/\w+?_plugin_(\w+)/', $line['class'], $match)
 191              ) {
 192                  return $match[1];
 193              }
 194  
 195              if (
 196                  isset($line['file']) &&
 197                  preg_match('/lib\/plugins\/(\w+)\//', str_replace('\\', '/', $line['file']), $match)
 198              ) {
 199                  return $match[1];
 200              }
 201          }
 202  
 203          return false;
 204      }
 205  }
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/inc/ -> ErrorHandler.php (source)

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