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1 | package Catalyst::Action::Serialize; |
2 | |
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3 | use Moose; |
4 | use namespace::autoclean; |
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5 | |
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6 | extends 'Catalyst::Action::SerializeBase'; |
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7 | use Module::Pluggable::Object; |
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8 | use MRO::Compat; |
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9 | |
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10 | # VERSION |
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11 | |
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12 | has _encoders => ( |
13 | is => 'ro', |
14 | isa => 'HashRef', |
15 | default => sub { {} }, |
16 | ); |
17 | |
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18 | sub execute { |
19 | my $self = shift; |
20 | my ( $controller, $c ) = @_; |
21 | |
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22 | $self->maybe::next::method(@_); |
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23 | |
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24 | return 1 if $c->req->method eq 'HEAD'; |
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25 | return 1 if $c->response->has_body; |
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26 | return 1 if scalar @{ $c->error }; |
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27 | return 1 if $c->response->status =~ /^(?:204)$/; |
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28 | return 1 if defined $c->stash->{current_view}; |
29 | return 1 if defined $c->stash->{current_view_instance}; |
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30 | |
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31 | my ( $sclass, $sarg, $content_type ) = |
32 | $self->_load_content_plugins( "Catalyst::Action::Serialize", |
33 | $controller, $c ); |
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34 | unless ( defined($sclass) ) { |
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35 | if ( defined($content_type) ) { |
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36 | $c->log->info("Could not find a serializer for $content_type"); |
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37 | } else { |
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38 | $c->log->info( |
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39 | "Could not find a serializer for an empty content-type"); |
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40 | } |
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41 | return 1; |
42 | } |
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43 | $c->log->debug( |
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44 | "Serializing with $sclass" . ( $sarg ? " [$sarg]" : '' ) ) if $c->debug; |
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45 | |
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46 | $self->_encoders->{$sclass} ||= $sclass->new; |
47 | my $sobj = $self->_encoders->{$sclass}; |
48 | |
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49 | my $rc; |
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50 | eval { |
51 | if ( defined($sarg) ) { |
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52 | $rc = $sobj->execute( $controller, $c, $sarg ); |
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53 | } else { |
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54 | $rc = $sobj->execute( $controller, $c ); |
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55 | } |
56 | }; |
57 | if ($@) { |
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58 | return $self->serialize_bad_request( $c, $content_type, $@ ); |
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59 | } elsif (!$rc) { |
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60 | return $self->unsupported_media_type( $c, $content_type ); |
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61 | } |
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62 | |
63 | return 1; |
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64 | } |
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65 | |
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66 | __PACKAGE__->meta->make_immutable; |
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67 | |
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68 | 1; |
69 | |
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70 | =head1 NAME |
71 | |
72 | Catalyst::Action::Serialize - Serialize Data in a Response |
73 | |
74 | =head1 SYNOPSIS |
75 | |
76 | package Foo::Controller::Bar; |
77 | |
78 | __PACKAGE__->config( |
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79 | 'default' => 'text/x-yaml', |
80 | 'stash_key' => 'rest', |
81 | 'map' => { |
82 | 'text/html' => [ 'View', 'TT', ], |
83 | 'text/x-yaml' => 'YAML', |
84 | 'text/x-data-dumper' => [ 'Data::Serializer', 'Data::Dumper' ], |
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85 | } |
86 | ); |
87 | |
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88 | sub end :ActionClass('Serialize') {} |
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89 | |
90 | =head1 DESCRIPTION |
91 | |
92 | This action will serialize the body of an HTTP Response. The serializer is |
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93 | selected by introspecting the HTTP Requests content-type header. |
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94 | |
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95 | It requires that your Catalyst controller is properly configured to set up the |
96 | mapping between Content Type's and Serialization classes. |
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97 | |
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98 | The specifics of serializing each content-type is implemented as a plugin to |
99 | L<Catalyst::Action::Serialize>. |
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100 | |
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101 | Typically, you would use this ActionClass on your C<end> method. However, |
102 | nothing is stopping you from choosing specific methods to Serialize: |
103 | |
104 | sub foo :Local :ActionClass('Serialize') { |
105 | .. populate stash with data .. |
106 | } |
107 | |
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108 | When you use this module, the request class will be changed to |
109 | L<Catalyst::Request::REST>. |
110 | |
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111 | =head1 CONFIGURATION |
112 | |
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113 | =head2 map |
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114 | |
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115 | Takes a hashref, mapping Content-Types to a given serializer plugin. |
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116 | |
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117 | =head2 default |
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118 | |
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119 | This is the 'fall-back' Content-Type if none of the requested or acceptable |
120 | types is found in the L</map>. It must be an entry in the L</map>. |
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121 | |
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122 | =head2 stash_key |
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123 | |
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124 | Specifies the key of the stash entry holding the data that is to be serialized. |
125 | So if the value is "rest", we will serialize the data under: |
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126 | |
127 | $c->stash->{'rest'} |
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128 | |
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129 | =head2 content_type_stash_key |
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130 | |
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131 | Specifies the key of the stash entry that optionally holds an overriding |
132 | Content-Type. If set, and if the specified stash entry has a valid value, |
133 | then it takes priority over the requested content types. |
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134 | |
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135 | This can be useful if you want to dynamically force a particular content type, |
136 | perhaps for debugging. |
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137 | |
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138 | =head1 HELPFUL PEOPLE |
139 | |
140 | Daisuke Maki pointed out that early versions of this Action did not play |
141 | well with others, or generally behave in a way that was very consistent |
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142 | with the rest of Catalyst. |
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143 | |
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144 | =head1 CUSTOM ERRORS |
145 | |
146 | For building custom error responses when serialization fails, you can create |
147 | an ActionRole (and use L<Catalyst::Controller::ActionRole> to apply it to the |
148 | C<end> action) which overrides C<unsupported_media_type> and/or C<_serialize_bad_request> |
149 | methods. |
150 | |
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151 | =head1 SEE ALSO |
152 | |
153 | You likely want to look at L<Catalyst::Controller::REST>, which implements |
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154 | a sensible set of defaults for doing a REST controller. |
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155 | |
156 | L<Catalyst::Action::Deserialize>, L<Catalyst::Action::REST> |
157 | |
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158 | =head1 AUTHORS |
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159 | |
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160 | See L<Catalyst::Action::REST> for authors. |
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161 | |
162 | =head1 LICENSE |
163 | |
164 | You may distribute this code under the same terms as Perl itself. |
165 | |
166 | =cut |