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annotate Lib/IMPL/Web/Handler/ErrorHandler.pm @ 357:ec58c47edb52

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web security: code cleanup, refactoring
author cin
date Fri, 18 Oct 2013 15:10:10 +0400
parents feeb3bc4a818
children 69a1f1508696
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1 package IMPL::Web::Handler::ErrorHandler;
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2 use strict;
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3
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4 use IMPL::Const qw(:prop);
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5 use IMPL::Exception();
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6 use IMPL::declare {
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7 require => {
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8 WebException => 'IMPL::Web::Exception',
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9 ArgumentException => '-IMPL::InvalidArgumentException',
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10 IOException => '-IMPL::IOException',
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11 HttpResponse => 'IMPL::Web::HttpResponse'
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12 },
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13 base => {
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14 'IMPL::Object' => undef,
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15 'IMPL::Object::Autofill' => '@_',
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16 'IMPL::Object::Serializable' => undef
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17 },
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18 props => [
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19 errors => PROP_RW,
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20 view => PROP_RW,
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21 layout => PROP_RW,
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22 fallback => PROP_RW,
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23 contentType => PROP_RW
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24 ]
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25 };
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26
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27 sub CTOR {
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28 my ($this) = @_;
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29
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30 die ArgumentException->new("view") unless $this->view;
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31 die ArgumentException->new("fallback") unless $this->fallback;
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32
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33 $this->errors({}) unless $this->errors;
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34
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35 }
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36
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37 sub Invoke {
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38 my ($this,$action,$next) = @_;
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39
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40 undef $@;
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41 my $result;
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42 eval {
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43 $result = $next ? $next->($action) : undef;
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44 };
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45
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46 if (my $err = $@) {
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47
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48 warn "error handler: $err";
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49
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50 my $vars = {
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51 error => $err
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52 };
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53
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54 my $status = "500 Internal Server Error";
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55
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56 if (eval { $err->isa(WebException) }) {
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57 $status = $err->status;
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58 }
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59
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60 my ($code) = ($status =~ m/^(\d+)/);
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61
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62 my $text = $this->view->display(
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63 $err,
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64 $this->errors->{$code} || $this->fallback,
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65 {
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66 layout => $this->layout
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67 }
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68 );
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70 $result = HttpResponse->new(
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71 status => $status,
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72 type => $this->contentType,
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73 charset => 'utf-8',
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74 headers => eval{ $err->headers } || {},
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75 body => $text
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76 );
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77 }
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78
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79 return $result;
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80 }
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81
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82 1;
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83
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84 __END__
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85
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86 =pod
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87
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88 =head1 NAME
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89
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90 C<IMPL::Web::Handler::ErrorHandler> - обертка для обработки исключений.
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92 =head1 SYNOPSIS
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93
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94 Используется в цеопчке обработчиков приложения.
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95
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96 =begin code xml
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97
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98 <handlers type="ARRAY">
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99 <item type="IMPL::Web::Handler::ErrorHandler">
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100 <contentType>text/html</contentType>
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101 <loader refid="tt-loader"/>
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102 <errors type="HASH">
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103 <error extname="500">errors/500</error>
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104 <error extname="404">errors/404</error>
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105 <error extname="403">errors/403</error>
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106 </errors>
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107 <fallback>errors/500</fallback>
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108 </item>
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109 </handlers>
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110
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111 =end code xml
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112
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113 =head1 DESCRIPTION
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114
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115 Позволяет создать представление для ресурса в случае ошибки, для этого
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116 используется соответствие представлений и кодов ошибок.
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117
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118 В результате обработчик либо прозрачно передает результат вышестоящего
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119 обработчика нижестоящему, либо создает C<IMPL::Web::HttpResponse> с
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120 соответствующим статусом и содержанием.
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121
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122 =cut