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1 | # |
2 | # REST.pm |
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3 | # Created by: Adam Jacob, Marchex, <adam@hjksolutions.com> |
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4 | # Created on: 10/12/2006 03:00:32 PM PDT |
5 | # |
6 | # $Id$ |
7 | |
8 | package Catalyst::Action::REST; |
9 | |
10 | use strict; |
11 | use warnings; |
12 | |
13 | use base 'Catalyst::Action'; |
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14 | use Class::Inspector; |
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15 | use Catalyst; |
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16 | use Catalyst::Request::REST; |
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17 | use Catalyst::Controller::REST; |
18 | |
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19 | use 5.8.1; |
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20 | |
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21 | our |
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22 | $VERSION = $Catalyst::Controller::REST::VERSION; |
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23 | |
24 | # This is wrong in several ways. First, there's no guarantee that |
25 | # Catalyst.pm has not been subclassed. Two, there's no guarantee that |
26 | # the user isn't already using their request subclass. |
27 | Catalyst->request_class('Catalyst::Request::REST') |
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28 | unless Catalyst->request_class->isa('Catalyst::Request::REST'); |
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29 | |
30 | =head1 NAME |
31 | |
32 | Catalyst::Action::REST - Automated REST Method Dispatching |
33 | |
34 | =head1 SYNOPSIS |
35 | |
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36 | sub foo :Local :ActionClass('REST') { |
37 | ... do setup for HTTP method specific handlers ... |
38 | } |
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39 | |
40 | sub foo_GET { |
41 | ... do something for GET requests ... |
42 | } |
43 | |
44 | sub foo_PUT { |
45 | ... do somethign for PUT requests ... |
46 | } |
47 | |
48 | =head1 DESCRIPTION |
49 | |
50 | This Action handles doing automatic method dispatching for REST requests. It |
51 | takes a normal Catalyst action, and changes the dispatch to append an |
52 | underscore and method name. |
53 | |
54 | For example, in the synopsis above, calling GET on "/foo" would result in |
55 | the foo_GET method being dispatched. |
56 | |
57 | If a method is requested that is not implemented, this action will |
58 | return a status 405 (Method Not Found). It will populate the "Allow" header |
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59 | with the list of implemented request methods. You can override this behavior |
60 | by implementing a custom 405 handler like so: |
61 | |
62 | sub foo_not_implemented { |
63 | ... handle not implemented methods ... |
64 | } |
65 | |
66 | If you do not provide an _OPTIONS subroutine, we will automatically respond |
67 | with a 200 OK. The "Allow" header will be populated with the list of |
68 | implemented request methods. |
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69 | |
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70 | It is likely that you really want to look at L<Catalyst::Controller::REST>, |
71 | which brings this class together with automatic Serialization of requests |
72 | and responses. |
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73 | |
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74 | When you use this module, the request class will be changed to |
75 | L<Catalyst::Request::REST>. |
76 | |
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77 | =head1 METHODS |
78 | |
79 | =over 4 |
80 | |
81 | =item dispatch |
82 | |
83 | This method overrides the default dispatch mechanism to the re-dispatching |
84 | mechanism described above. |
85 | |
86 | =cut |
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87 | |
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88 | sub dispatch { |
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89 | my $self = shift; |
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90 | my $c = shift; |
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91 | |
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92 | my $controller = $c->component( $self->class ); |
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93 | my $method = $self->name . "_" . uc( $c->request->method ); |
94 | if ( $controller->can($method) ) { |
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95 | $c->execute( $self->class, $self, @{ $c->req->args } ); |
96 | return $controller->$method( $c, @{ $c->req->args } ); |
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97 | } else { |
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98 | if ( $c->request->method eq "OPTIONS" ) { |
99 | return $self->_return_options($c); |
100 | } else { |
101 | my $handle_ni = $self->name . "_not_implemented"; |
102 | if ( $controller->can($handle_ni) ) { |
103 | return $controller->$handle_ni( $c, @{ $c->req->args } ); |
104 | } else { |
105 | return $self->_return_not_implemented($c); |
106 | } |
107 | } |
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108 | } |
109 | } |
110 | |
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111 | sub _return_options { |
112 | my ( $self, $c ) = @_; |
113 | |
114 | my @allowed = $self->_get_allowed_methods($c); |
115 | $c->response->content_type('text/plain'); |
116 | $c->response->status(200); |
117 | $c->response->header( 'Allow' => \@allowed ); |
118 | } |
119 | |
120 | sub _get_allowed_methods { |
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121 | my ( $self, $c ) = @_; |
122 | |
123 | my $controller = $self->class; |
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124 | my $methods = Class::Inspector->methods($controller); |
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125 | my @allowed; |
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126 | foreach my $method ( @{$methods} ) { |
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127 | my $name = $self->name; |
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128 | if ( $method =~ /^$name\_(.+)$/ ) { |
129 | push( @allowed, $1 ); |
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130 | } |
131 | } |
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132 | return @allowed; |
133 | } |
134 | |
135 | sub _return_not_implemented { |
136 | my ( $self, $c ) = @_; |
137 | |
138 | my @allowed = $self->_get_allowed_methods($c); |
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139 | $c->response->content_type('text/plain'); |
140 | $c->response->status(405); |
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141 | $c->response->header( 'Allow' => \@allowed ); |
142 | $c->response->body( "Method " |
143 | . $c->request->method |
144 | . " not implemented for " |
145 | . $c->uri_for( $self->reverse ) ); |
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146 | } |
147 | |
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148 | 1; |
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149 | |
150 | =back |
151 | |
152 | =head1 SEE ALSO |
153 | |
154 | You likely want to look at L<Catalyst::Controller::REST>, which implements |
155 | a sensible set of defaults for a controller doing REST. |
156 | |
157 | L<Catalyst::Action::Serialize>, L<Catalyst::Action::Deserialize> |
158 | |
159 | =head1 AUTHOR |
160 | |
161 | Adam Jacob <adam@stalecoffee.org>, with lots of help from mst and jrockway |
162 | |
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163 | Marchex, Inc. paid me while I developed this module. (http://www.marchex.com) |
164 | |
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165 | =head1 CONTRIBUTERS |
166 | |
167 | Daisuke Maki <daisuke@endeworks.jp> |
168 | |
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169 | =head1 LICENSE |
170 | |
171 | You may distribute this code under the same terms as Perl itself. |
172 | |
173 | =cut |
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174 | |