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ASP4
use base 'ASP4::HTTPHandler';
use vars __PACKAGE__->VARS;
use MIME::Base64;
use Data::Dumper;


sub run
{
  my ($s, $context) = @_;
  
  my $error = $Stash->{error};
  $s->print_error( $error );
  $s->send_error( $error );
}# end run()


sub print_error
{
  my ($s, $error) = @_;
  
  $Response->ContentType('text/html');

  if( $ENV{HTTP_HOST} eq 'localhost' )
  {
    $Response->Write( Dumper(\%$error) );
  }
  else
  {
    $Response->Write( $s->error_html( $error ) );
  }# end if()
  
  $Response->Flush;
}# end print_error()


sub send_error
{
  my ($s, $error) = @_;
  
  $Server->Mail(
    To                          => $Config->errors->mail_errors_to,
    From                        => $Config->errors->mail_errors_from,
    Subject                     => "ASP4: Error in @{[ $ENV{HTTP_HOST} ]}@{[ $ENV{REQUEST_URI} ]}",
    'content-type'              => 'text/html',
    'content-transfer-encoding' => 'base64',
    Message                     => encode_base64( $s->error_html($error) ),
    smtp                        => $Config->errors->smtp_server,
  );
}# end send_error()


sub error_html
{
  my ($s, $error) = @_;
  
  my $msg = <<"ERROR";
<!DOCTYPE html>
<html>
<head><title>500 Server Error</title>
<meta charset="utf-8" />
<style type="text/css">
HTML,BODY {
  background-color: #FFFFFF;
}
HTML,BODY,P,DIV {
  font-family: Arial, Helvetica, Sans-Serif;
}
HTML,BODY,P,PRE,DIV {
  font-size: 12px;
}
H1 {
  font-size: 50px;
  font-weight: bold;
}
PRE {
  padding-right: 10px;
  line-height: 16px;
}
.code {
  margin-top: 20px;
  margin-left: 15px;
  width: 95%;
  padding: 10px;
  overflow: auto;
  border: solid 1px #808080;
  background-color: #FFFFCC;
}
.clear {
  clear: both;
}
.label {
  text-align: right;
  padding-right: 5px;
  float: left;
  width: 80px;
  font-weight: bold;
}
.info {
  float: left;
  color: #CC0000;
}
</style>
<body>
<h1>500 Server Error</h1>
<h2>@{[ $error->message ]}</h2>
<div><div class="label">URL:</div> <div class="info"><code>@{[ $ENV{HTTP_HOST} ]}@{[ $ENV{REQUEST_URI} ]}</code></div></div>
<div class="clear"></div>
<div><div class="label">File:</div> <div class="info"><code>@{[ $error->file ]}</code></div></div>
<div class="clear"></div>
<div><div class="label">Line:</div> <div class="info">@{[ $error->line ]}</div></div>
<div class="clear"></div>
<div><div class="label">Time:</div> <div class="info">@{[ HTTP::Date::time2iso() ]}</div></div>
<div class="clear"></div>
<h2>Stacktrace follows below:</h2>
<div class="code"><pre>@{[ $error->stacktrace ]}</pre></div>
<div class="clear"></div>
<h3>\%ENV</h3>
<div class="code"><pre>
HTTP_REFERER:     '@{[ $Server->HTMLEncode($ENV{HTTP_REFERER}||'NONE') ]}'
HTTP_COOKIE:      '@{[ $Server->HTMLEncode($ENV{HTTP_COOKIE}||'NONE') ]}'
HTTP_USER_AGENT:  '@{[ $Server->HTMLEncode($ENV{HTTP_USER_AGENT}||'NONE') ]}'
REMOTE_ADDR:      '@{[ $Server->HTMLEncode($ENV{REMOTE_ADDR}||'NONE') ]}'
</pre></div>
<h3>\$Form</h3>
<div class="code"><pre>@{[ Dumper($Form) ]}</pre></div>
<div class="clear"></div>
<div style="display: none;">
</body>
</html>
ERROR
  
  return $msg;
}# end error_html()


1;# return true:

=pod

=head1 NAME

ASP4::ErrorHandler - Default fatal error handler

=head1 SYNOPSIS

In your C<asp4-config.json>:

  ...
    "errors": {
      "error_handler":    "ASP4::ErrorHandler",
      "mail_errors_to":   "you@server.com",
      "mail_errors_from": "root@localhost",
      "smtp_server":      "localhost"
    },
  ...

=head1 DESCRIPTION

This class provides a default error handler which does the following:

1) Makes a simple HTML page and prints it to the browser, telling the user
that an error has just occurred.

2) Sends that same HTML to the email address specified in the config, using the
SMTP server also specified in the config.  The email subject will look something like:

  ASP4: Error in your-site.com/index.asp

=head1 SUBCLASSING

To subclass C<ASP4::ErrorHandler> you must do the following:

  package My::ErrorHandler;
  
  use strict;
  use warnings 'all';
  use base 'ASP4::ErrorHandler';
  use vars __PACKAGE__->VARS;
  
  sub run {
    my ($s, $context) = @_;
    
    my $error = $Stash->{error};
    
    # $error is an ASP4::Error object.
  
    # Do something here about the error.
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