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1 | package Catalyst::Action::REST; |
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'; |
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7 | use Class::Inspector; |
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8 | use Catalyst::Request::REST; |
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9 | use Catalyst::Controller::REST; |
10 | |
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11 | BEGIN { require 5.008001; } |
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12 | |
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13 | our $VERSION = '0.90'; |
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14 | $VERSION = eval $VERSION; |
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15 | |
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16 | sub BUILDARGS { |
17 | my $class = shift; |
18 | my $config = shift; |
19 | Catalyst::Request::REST->_insert_self_into( $config->{class} ); |
20 | return $class->SUPER::BUILDARGS($config, @_); |
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21 | } |
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22 | |
23 | =head1 NAME |
24 | |
25 | Catalyst::Action::REST - Automated REST Method Dispatching |
26 | |
27 | =head1 SYNOPSIS |
28 | |
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29 | sub foo :Local :ActionClass('REST') { |
30 | ... do setup for HTTP method specific handlers ... |
31 | } |
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32 | |
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33 | sub foo_GET { |
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34 | ... do something for GET requests ... |
35 | } |
36 | |
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37 | # alternatively use an Action |
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38 | sub foo_PUT : Action { |
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39 | ... do something for PUT requests ... |
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40 | } |
41 | |
42 | =head1 DESCRIPTION |
43 | |
44 | This Action handles doing automatic method dispatching for REST requests. It |
45 | takes a normal Catalyst action, and changes the dispatch to append an |
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46 | underscore and method name. First it will try dispatching to an action with |
47 | the generated name, and failing that it will try to dispatch to a regular |
48 | method. |
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49 | |
50 | For example, in the synopsis above, calling GET on "/foo" would result in |
51 | the foo_GET method being dispatched. |
52 | |
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53 | If a method is requested that is not implemented, this action will |
54 | return a status 405 (Method Not Found). It will populate the "Allow" header |
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55 | with the list of implemented request methods. You can override this behavior |
56 | by implementing a custom 405 handler like so: |
57 | |
58 | sub foo_not_implemented { |
59 | ... handle not implemented methods ... |
60 | } |
61 | |
62 | If you do not provide an _OPTIONS subroutine, we will automatically respond |
63 | with a 200 OK. The "Allow" header will be populated with the list of |
64 | implemented request methods. |
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65 | |
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66 | It is likely that you really want to look at L<Catalyst::Controller::REST>, |
67 | which brings this class together with automatic Serialization of requests |
68 | and responses. |
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69 | |
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70 | When you use this module, it adds the L<Catalyst::TraitFor::Request::REST> |
71 | role to your request class. |
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72 | |
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73 | =head1 METHODS |
74 | |
75 | =over 4 |
76 | |
77 | =item dispatch |
78 | |
79 | This method overrides the default dispatch mechanism to the re-dispatching |
80 | mechanism described above. |
81 | |
82 | =cut |
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83 | |
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84 | sub dispatch { |
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85 | my $self = shift; |
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86 | my $c = shift; |
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87 | |
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88 | my $rest_method = $self->name . "_" . uc( $c->request->method ); |
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89 | |
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90 | return $self->_dispatch_rest_method( $c, $rest_method ); |
91 | } |
92 | |
93 | sub _dispatch_rest_method { |
94 | my $self = shift; |
95 | my $c = shift; |
96 | my $rest_method = shift; |
97 | |
98 | my $controller = $c->component( $self->class ); |
99 | |
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100 | my ($code, $name); |
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101 | |
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102 | # Common case, for foo_GET etc |
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103 | if ( $code = $controller->action_for($rest_method) ) { |
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104 | $c->execute( $self->class, $self, @{ $c->req->args } ); # Execute normal 'foo' action. |
105 | return $c->forward( $code, $c->req->args ); # Forward to foo_GET if it's an action |
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106 | } |
107 | elsif ($code = $controller->can($rest_method)) { |
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108 | # Execute normal action |
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109 | $c->execute( $self->class, $self, @{ $c->req->args } ); |
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110 | $name = $rest_method; # Stash name and code to run 'foo_GET' like an action below. |
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111 | } |
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112 | |
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113 | # Generic handling for foo_OPTIONS |
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114 | if (!$code) { |
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115 | if ( $c->request->method eq "OPTIONS") { |
116 | $name = $rest_method; |
117 | $code = sub { $self->_return_options($self->name, @_) }; |
118 | } |
119 | else { |
120 | # Otherwise, not implemented. |
121 | $name = $self->name . "_not_implemented"; |
122 | $code = $controller->can($name) # User method |
123 | # Generic not implemented |
124 | || sub { $self->_return_not_implemented($self->name, @_) }; |
125 | } |
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126 | } |
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127 | |
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128 | # localise stuff so we can dispatch the action 'as normal, but get |
129 | # different stats shown, and different code run. |
130 | local $self->{code} = $code; |
131 | local $self->{reverse} = $name; |
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132 | |
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133 | $c->execute( $self->class, $self, @{ $c->req->args } ); |
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134 | } |
135 | |
136 | sub _get_allowed_methods { |
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137 | my ( $self, $controller, $c, $name ) = @_; |
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138 | my $class = ref($controller) ? ref($controller) : $controller; |
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139 | my $methods = Class::Inspector->methods($class); |
140 | return map { /^$name\_(.+)$/ } @$methods; |
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141 | }; |
142 | |
143 | sub _return_options { |
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144 | my ( $self, $method_name, $controller, $c) = @_; |
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145 | my @allowed = $self->_get_allowed_methods($controller, $c, $method_name); |
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146 | $c->response->content_type('text/plain'); |
147 | $c->response->status(200); |
148 | $c->response->header( 'Allow' => \@allowed ); |
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149 | } |
150 | |
151 | sub _return_not_implemented { |
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152 | my ( $self, $method_name, $controller, $c ) = @_; |
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153 | |
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154 | my @allowed = $self->_get_allowed_methods($controller, $c, $method_name); |
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155 | $c->response->content_type('text/plain'); |
156 | $c->response->status(405); |
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157 | $c->response->header( 'Allow' => \@allowed ); |
158 | $c->response->body( "Method " |
159 | . $c->request->method |
160 | . " not implemented for " |
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161 | . $c->uri_for( $method_name ) ); |
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162 | } |
163 | |
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164 | __PACKAGE__->meta->make_immutable; |
165 | |
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166 | 1; |
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167 | |
168 | =back |
169 | |
170 | =head1 SEE ALSO |
171 | |
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172 | You likely want to look at L<Catalyst::Controller::REST>, which implements a |
173 | sensible set of defaults for a controller doing REST. |
174 | |
175 | This class automatically adds the L<Catalyst::TraitFor::Request::REST> role to |
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176 | your request class. If you're writing a web application which provides RESTful |
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177 | responses and still needs to accommodate web browsers, you may prefer to use |
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178 | L<Catalyst::TraitFor::Request::REST::ForBrowsers> instead. |
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179 | |
180 | L<Catalyst::Action::Serialize>, L<Catalyst::Action::Deserialize> |
181 | |
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182 | =head1 TROUBLESHOOTING |
183 | |
184 | =over 4 |
185 | |
186 | =item Q: I'm getting a "415 Unsupported Media Type" error. What gives?! |
187 | |
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188 | A: Most likely, you haven't set Content-type equal to "application/json", or |
189 | one of the accepted return formats. You can do this by setting it in your query |
190 | accepted return formats. You can do this by setting it in your query string |
191 | thusly: C<< ?content-type=application%2Fjson (where %2F == / uri escaped). >> |
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192 | |
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193 | B<NOTE> Apache will refuse %2F unless configured otherwise. |
194 | Make sure C<AllowEncodedSlashes On> is in your httpd.conf file in order |
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195 | for this to run smoothly. |
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196 | |
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197 | =back |
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198 | |
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199 | =head1 AUTHOR |
200 | |
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201 | Adam Jacob E<lt>adam@stalecoffee.orgE<gt>, with lots of help from mst and jrockway |
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202 | |
203 | Marchex, Inc. paid me while I developed this module. (L<http://www.marchex.com>) |
204 | |
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205 | =head1 CONTRIBUTORS |
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206 | |
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207 | Tomas Doran (t0m) E<lt>bobtfish@bobtfish.netE<gt> |
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208 | |
209 | John Goulah |
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210 | |
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211 | Christopher Laco |
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212 | |
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213 | Daisuke Maki E<lt>daisuke@endeworks.jpE<gt> |
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214 | |
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215 | Hans Dieter Pearcey |
216 | |
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217 | Dave Rolsky E<lt>autarch@urth.orgE<gt> |
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218 | |
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219 | Luke Saunders |
220 | |
221 | Arthur Axel "fREW" Schmidt E<lt>frioux@gmail.comE<gt> |
222 | |
223 | J. Shirley E<lt>jshirley@gmail.comE<gt> |
224 | |
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225 | =head1 COPYRIGHT |
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226 | |
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227 | Copyright (c) 2006-2011 the above named AUTHOR and CONTRIBUTORS |
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228 | |
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229 | =head1 LICENSE |
230 | |
231 | You may distribute this code under the same terms as Perl itself. |
232 | |
233 | =cut |
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234 | |