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373
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1 package IMPL::Web::Application::Resource;
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2 use strict;
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3
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4 use constant {
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5 ResourceClass => __PACKAGE__
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6 };
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7 use Scalar::Util qw(blessed);
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8
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9 use IMPL::lang qw(:hash :base);
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10 use IMPL::Const qw(:prop);
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11 use IMPL::declare {
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12 require => {
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13 Exception => 'IMPL::Exception',
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14 OpException => '-IMPL::InvalidOperationException',
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15 NotFoundException => 'IMPL::Web::NotFoundException',
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16 ResourceInterface => '-IMPL::Web::Application',
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17 Loader => 'IMPL::Code::Loader'
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18 },
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19 base => [
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20 'IMPL::Object' => undef,
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21 'IMPL::Web::Application::ResourceBase' => '@_'
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22 ],
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23 props => [
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24 access => PROP_RW,
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25 verbs => PROP_RW,
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26 children => PROP_RW
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27 ]
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28 };
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29
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30 __PACKAGE__->static_accessor(verbNames => [qw(get post put delete options head)]);
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31 __PACKAGE__->static_accessor(httpMethodPrefix => 'Http');
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32
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33 sub CTOR {
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34 my ($this, %args) = @_;
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35
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36 my %verbs;
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37 my $httpPrefix = $this->httpMethodPrefix;
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38
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39 foreach my $verb (@{$this->verbNames}) {
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40 my $method = exists $args{$verb} ? $args{$verb} : $this->can($httpPrefix . ucfirst($verb));
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41 $verbs{$verb} = $method
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42 if $method;
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43 }
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44
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45 hashApply(\%verbs,$args{verbs})
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46 if ref($args{verbs}) eq 'HASH' ;
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47
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48 $this->children($args{children} || $this->GetChildResources());
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49
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50 $this->access($args{access})
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51 if $args{access};
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52
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53 $this->verbs(\%verbs);
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54 }
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55
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56 sub _isInvokable {
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57 my ($this,$method) = @_;
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58
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59 return
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60 (blessed($method) and $method->can('Invoke')) ||
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61 ref($method) eq 'CODE'
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62 }
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63
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64 sub _invoke {
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65 my ($this,$method,@args) = @_;
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66
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67 if(blessed($method) and $method->can('Invoke')) {
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68 return $method->Invoke($this,@args);
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69 } elsif(ref($method) eq 'CODE' || (not(ref($method)) and $this->can($method))) {
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70 return $this->$method(@args);
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71 } else {
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72 die OpException->new("Can't invoke the specified method: $method");
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73 }
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74 }
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75
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76 sub HttpGet {
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77 shift->model;
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78 }
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79
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80 sub Fetch {
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81 my ($this,$childId) = @_;
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82
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83 my $children = $this->children
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84 or die NotFoundException->new( $this->location->url, $childId );
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85
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86 if (ref($children) eq 'HASH') {
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87 return $children->{$childId};
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374
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88 } elsif($this->_isInvokable($children)) {
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89 return $this->_invoke($children,$childId);
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373
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90 } else {
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374
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91 die OpException->new("Invalid resource description", $childId, $children);
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373
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92 }
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93 }
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94
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95 sub FetchChildResource {
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96 my ($this,$childId) = @_;
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97
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98 my $info = $this->Fetch($childId);
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99
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100 return $info
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101 if (is($info,ResourceInterface));
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102
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103 return $this->CreateChildResource($info, $childId)
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104 if ref($info) eq 'HASH';
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105
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106 die OpException->new("Invalid resource description", $childId, $info);
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107 }
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108
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109 sub CreateChildResource {
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110 my ($this,$info, $childId) = @_;
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111
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112 my $params = hashApply(
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113 {
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114 parent => $this,
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115 id => $childId,
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116 request => $this->request,
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117 class => ResourceClass
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118 },
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119 $info
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120 );
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121
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122 $params->{model} = $this->_invoke($params->{model})
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123 if $this->_isInvokable($params->{model});
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124
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125 my $factory = Loader->default->Require($params->{class});
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126
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127 return $factory->new(%$params);
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128 }
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129
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130 sub GetChildResources {
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131 return {};
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132 }
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133
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134 1;
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135
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136 __END__
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137
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138 =pod
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139
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140 =head1 NAME
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141
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142 C<IMPL::Web::Application::Resource> - Ресурс C<REST> веб приложения
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143
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144 =head1 SYNOPSIS
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145
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146 =begin code
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147
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148 use IMPL::require {
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149 Resource => 'IMPL::Web::Application::Resource',
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150 Security => 'IMPL::Security',
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151 NotFoundException => 'IMPL::Web::NotFoundException',
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152 ForbiddenException => 'IMPL::Web::ForbiddenException'
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153 };
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154
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155 my $model = Resource->new(
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156 get => sub { },
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157 verbs => {
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158 # non-standart verbs placed here
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159 myverb => sub { }
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160 },
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161 #child resources can be a hash
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162 chidren => {
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163 user => {
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164 # a resource class may be specified optionally
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165 # class => Resource,
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166 model => sub {
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167 return Security->principal
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168 },
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169 # the default get implementation is implied
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170 # get => sub { shift->model },
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171 access => sub {
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172 my ($this,$verb) = @_;
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173 die ForbiddenException->new()
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174 if Security->principal->isNobody
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175 }
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176 },
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177 catalog => {
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178 get => sub {
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179 my $ctx = shift->application->ConnectDb()->AutoPtr();
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180
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181 return $ctx->products->find_rs({ in_stock => 1 });
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182 },
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183 # chid resource may be created dynamically
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184 children => sub {
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185 # binds model against the parent reource and id
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186 my ($this,$id) = @_;
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187
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188 ($id) = ($id =~ /^(\w+)$/)
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189 or die NotFoundException->new($id);
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190
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191 my $ctx = shift->application->ConnectDb()->AutoPtr();
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192
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193 my $item = $ctx->products->fetch($id);
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194
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195 die NotFoundException->new()
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196 unless $item;
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197
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198 # return parameters for the new resource
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199 return {
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200 model => $item,
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201 get => sub { shift->model }
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202 };
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203 }
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204 },
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205 # dynamically binds whole child resource. The result of binding is
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206 # the new resource or a hash with arguments to create one
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207 posts => sub {
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208 my ($this,$id) = @_;
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209
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210 # this approach can be used to create a dynamic resource relaying
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211 # on the type of the model
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212
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213 return Resource->new(
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214 id => $id,
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215 parent => $this,
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216 get => sub { shift->model }
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217 );
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218
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219 # ditto
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220 # parent and id will be mixed in automagically
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221 # return { get => sub { shift->model} }
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222 },
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223 post_only => {
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224 get => undef, # remove GET verb implicitly
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225 post => sub {
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226 my ($this) = @_;
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227 }
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228 }
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229 }
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230 );
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231
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232 =end code
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233
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234 Альтернативный вариант для создания класса ресурса.
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235
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236 =begin code
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237
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238 package MyResource;
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239
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240 use IMPL::declare {
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241 require => {
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242 ForbiddenException => 'IMPL::Web::ForbiddenException'
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243 },
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244 base => [
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245 'IMPL::Web::Application::Resource' => '@_'
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246 ]
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247 };
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248
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249 sub ds {
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250 my ($this) = @_;
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251
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252 $this->context->{ds} ||= $this->application->ConnectDb();
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253 }
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254
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255 sub InvokeHttpVerb {
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256 my $this = shift;
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257
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258 $this->ds->Begin();
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259
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260 my $result = $this->next::method(@_);
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261
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262 # in case of error the data context will be disposed and the transaction
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263 # will be reverted
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264 $this->ds->Commit();
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265
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266 return $result;
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267 }
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268
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269 # this method is inherited by default
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270 # sub HttpGet {
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271 # shift->model
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272 #
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273 # }
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274
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275 sub HttpPost {
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276 my ($this) = @_;
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277
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278 my %data = map {
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279 $_,
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280 $this->request->param($_)
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281 } qw(name description value);
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282
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283 die ForbiddenException->new("The item with the scpecified name can't be created'")
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284 if(not $data{name} or $this->ds->items->find({ name => $data{name}))
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285
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286 $this->ds->items->insert(\%data);
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287
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288 return $this->NoContent();
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289 }
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290
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291 sub Fetch {
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292 my ($this,$childId) = @_;
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293
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294 my $item = $this->ds->items->find({name => $childId})
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295 or die NotFoundException->new();
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296
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297 # return parameters for the child resource
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298 return { model => $item, role => "item food" };
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299 }
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300
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301 =end code
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302
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374
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303 =head1 MEMBERS
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304
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305 =head2 C<[virtual]Fetch($childId)>
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306
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307 Метод для получения дочернего ресурса.
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308
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309 Возвращает параметры для создания дочернего ресурса, либо уже созданный ресурс.
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310 Создание дочернего ресурса происходит при помощи метода C<CreateChildResource()>
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311 который добавляет недостающие параметры к возвращенным в данным методом и
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312 создает новый ресурс
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313
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314 =head2 C<>
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315
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373
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316 =cut
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317
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