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          * @var \http\Env\Response
  14          */
  15         private $response;
  16
  17         /**
  18          * Set up error/exception/shutdown handler
  19          */
  20         public function __construct(\http\Env\Response $r) {
  21                 $this->response = $r;
  22                 set_exception_handler($this);
  23                 set_error_handler($this);
  24                 register_shutdown_function($this);
  25         }
  26
  27         private static function cleanBuffers() {
  28                 while (ob_get_level()) {
  29                         if (!@ob_end_clean()) {
  30                                 break;
  31                         }
  32                 }
  33         }
  34
  35         /**
  36          * The exception/error/shutdown handler callback
  37          */
  38         public function __invoke($e = null, $msg = null) {
  39                 if ($e instanceof \Exception || $e instanceof \Throwable) {
  40                         try {
  41                                 self::cleanBuffers();
  42                                 echo static::htmlException($e);
  43                         } catch (\Exception $ignore) {
  44                                 headers_sent() or HTTP::setResponseCode(500);
  45                                 die("FATAL ERROR:\n$e\n$ignore");
  46                         }
  47                 } elseif (isset($e, $msg)) {
  48                         throw new \Exception($msg, $e);
  49                 } elseif (($error = error_get_last())) {
  50                         switch ($error["type"]) {
  51                         case E_PARSE:
  52                         case E_ERROR:
  53                         case E_USER_ERROR:
  54                         case E_CORE_ERROR:
  55                         case E_COMPILE_ERROR:
  56                                 self::cleanBuffers();
  57                                 $message = sprintf("%s in %s at line %d",
  58                                         $error["message"], $error["file"], $error["line"]);
  59                                 echo static::htmlError("Application Error", $message, 500, "");
  60                                 break;
  61                         }
  62                 }
  63         }
  64
  65         /**
  66          * Format an exception as HTML and send appropriate exception info as HTTP headers
  67          * @param Throwable $e
  68          * @param array $title_tag
  69          * @param array $message_tag
  70          * @param array $trace_tag
  71          * @return string
  72          */
  73         public static function htmlException(/*\Throwable*/ $e, array $title_tag = ["h1"], array $message_tag = ["p"], array $trace_tag = ["pre", "style='font-size:smaller;overflow-x:scroll'"]) {
  74                 if ($e instanceof Exception) {
  75                         $code = $e->getCode() ?: 500;
  76                 } else {
  77                         $code = 500;
  78                 }
  79
  80                 for ($html = ""; $e; $e = $e->getPrevious()) {
  81                         $html .= static::htmlError(HTTP::getResponseStatusForCode($code),
  82                                 $e->getMessage(), $code, $e->getTraceAsString(),
  83                                 $title_tag, $message_tag, $trace_tag);
  84                 }
  85                 return $html;
  86         }
  87
  88         /**
  89          * Format an error as HTML
  90          * @param string $title
  91          * @param string $message
  92          * @param int $code
  93          * @param string $trace
  94          * @param array $title_tag
  95          * @param array $message_tag
  96          * @param array $trace_tag
  97          * @return string
  98          */
  99         public static function htmlError($title, $message, $code, $trace = null, array $title_tag = ["h1"], array $message_tag = ["p"], array $trace_tag = ["pre", "style='font-size:smaller;overflow-x:scroll'"]) {
 100                 HTTP::setResponseCode($code);
 101
 102                 $html = sprintf("<%s>%s</%s>\n<%s>%s</%s>\n",
 103                                 implode(" ", $title_tag), $title, $title_tag[0],
 104                                 implode(" ", $message_tag), $message, $message_tag[0]);
 105                 if ($trace_tag) {
 106                         if (!isset($trace)) {
 107                                 ob_start();
 108                                 debug_print_backtrace();
 109                                 $trace = ob_get_clean();
 110                         }
 111                         if (!empty($trace)) {
 112                                 $html .= sprintf("<%s>%s</%s>\n",
 113                                                 implode(" ", $trace_tag), $trace, $trace_tag[0]);
 114                         }
 115                 }
 116
 117                 return $html;
 118         }
 119 }