git.m6w6.name Git - mdref/mdref/blob - mdref/ExceptionHandler.php

   1 <?php
   2
   3 namespace mdref;
   4
   5 use http\Env as HTTP;
   6
   7 /**
   8  * Exception and error handler
   9  */
  10 class ExceptionHandler
  11 {
  12         /**
  13          * Set up error/exception/shutdown handler
  14          */
  15         public function __construct() {
  16                 set_exception_handler($this);
  17                 set_error_handler($this);
  18                 register_shutdown_function($this);
  19         }
  20
  21         /**
  22          * The exception/error/shutdown handler callback
  23          */
  24         public function __invoke($e = null, $msg = null) {
  25                 if ($e instanceof \Exception) {
  26                         try {
  27                                 echo static::htmlException($e);
  28                         } catch (\Exception $ignore) {
  29                                 headers_sent() or HTTP::setResponseCode(500);
  30                                 die("FATAL ERROR");
  31                         }
  32                 } elseif (isset($e, $msg)) {
  33                         throw new \Exception($msg, $e);
  34                 } elseif (($error = error_get_last())) {
  35                         switch ($error["type"]) {
  36                         case E_PARSE:
  37                         case E_ERROR:
  38                         case E_USER_ERROR:
  39                         case E_CORE_ERROR:
  40                         case E_COMPILE_ERROR:
  41                                 while (ob_get_level()) {
  42                                         if (!@ob_end_clean()) {
  43                                                 break;
  44                                         }
  45                                 }
  46                                 $message = sprintf("%s in %s at line %d",
  47                                         $error["message"], $error["file"], $error["line"]);
  48                                 echo static::htmlError("Application Error", $message, 500, "");
  49                                 break;
  50                         }
  51                 }
  52         }
  53
  54         /**
  55          * Format an exception as HTML and send appropriate exception info as HTTP headers
  56          * @param \Exception $e
  57          * @param array $title_tag
  58          * @param array $message_tag
  59          * @param array $trace_tag
  60          * @return string
  61          */
  62         public static function htmlException(\Exception $e, array $title_tag = ["h1"], array $message_tag = ["p"], array $trace_tag = ["pre", "style='font-size:smaller;overflow-x:scroll'"]) {
  63                 if ($e instanceof \http\Controller\Exception) {
  64                         $code = $e->getCode() ?: 500;
  65                         foreach ($e->getHeaders() as $key => $val) {
  66                                 HTTP::setResponseHeader($key, $val);
  67                         }
  68                 } else {
  69                         $code = 500;
  70                 }
  71
  72                 for ($html = ""; $e; $e = $e->getPrevious()) {
  73                         $html .= static::htmlError(HTTP::getResponseStatusForCode($code),
  74                                 $e->getMessage(), $code, $e->getTraceAsString(),
  75                                 $title_tag, $message_tag, $trace_tag);
  76                 }
  77                 return $html;
  78         }
  79
  80         /**
  81          * Format an error as HTML
  82          * @param string $title
  83          * @param string $message
  84          * @param int $code
  85          * @param string $trace
  86          * @param array $title_tag
  87          * @param array $message_tag
  88          * @param array $trace_tag
  89          * @return string
  90          */
  91         public static function htmlError($title, $message, $code, $trace = null, array $title_tag = ["h1"], array $message_tag = ["p"], array $trace_tag = ["pre", "style='font-size:smaller;overflow-x:scroll'"]) {
  92                 HTTP::setResponseCode($code);
  93
  94                 $html = sprintf("<%s>%s</%s>\n<%s>%s</%s>\n",
  95                                 implode(" ", $title_tag), $title, $title_tag[0],
  96                                 implode(" ", $message_tag), $message, $message_tag[0]);
  97                 if ($trace_tag) {
  98                         if (!isset($trace)) {
  99                                 ob_start();
 100                                 debug_print_backtrace();
 101                                 $trace = ob_get_clean();
 102                         }
 103                         if (!empty($trace)) {
 104                                 $html .= sprintf("<%s>%s</%s>\n",
 105                                                 implode(" ", $trace_tag), $trace, $trace_tag[0]);
 106                         }
 107                 }
 108
 109                 return $html;
 110         }
 111 }