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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 | sub BUILDARGS { |
14 | my $class = shift; |
15 | my $config = shift; |
16 | Catalyst::Request::REST->_insert_self_into( $config->{class} ); |
17 | return $class->SUPER::BUILDARGS($config, @_); |
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18 | } |
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19 | |
20 | =head1 NAME |
21 | |
22 | Catalyst::Action::REST - Automated REST Method Dispatching |
23 | |
24 | =head1 SYNOPSIS |
25 | |
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26 | sub foo :Local :ActionClass('REST') { |
27 | ... do setup for HTTP method specific handlers ... |
28 | } |
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29 | |
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30 | sub foo_GET { |
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31 | ... do something for GET requests ... |
32 | } |
33 | |
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34 | # alternatively use an Action |
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35 | sub foo_PUT : Action { |
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36 | ... do something for PUT requests ... |
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37 | } |
38 | |
39 | =head1 DESCRIPTION |
40 | |
41 | This Action handles doing automatic method dispatching for REST requests. It |
42 | takes a normal Catalyst action, and changes the dispatch to append an |
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43 | underscore and method name. First it will try dispatching to an action with |
44 | the generated name, and failing that it will try to dispatch to a regular |
45 | method. |
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46 | |
47 | For example, in the synopsis above, calling GET on "/foo" would result in |
48 | the foo_GET method being dispatched. |
49 | |
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50 | If a method is requested that is not implemented, this action will |
51 | return a status 405 (Method Not Found). It will populate the "Allow" header |
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52 | with the list of implemented request methods. You can override this behavior |
53 | by implementing a custom 405 handler like so: |
54 | |
55 | sub foo_not_implemented { |
56 | ... handle not implemented methods ... |
57 | } |
58 | |
59 | If you do not provide an _OPTIONS subroutine, we will automatically respond |
60 | with a 200 OK. The "Allow" header will be populated with the list of |
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61 | implemented request methods. If you do not provide an _HEAD either, we will |
62 | auto dispatch to the _GET one in case it exists. |
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63 | |
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64 | It is likely that you really want to look at L<Catalyst::Controller::REST>, |
65 | which brings this class together with automatic Serialization of requests |
66 | and responses. |
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67 | |
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68 | When you use this module, it adds the L<Catalyst::TraitFor::Request::REST> |
69 | role to your request class. |
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70 | |
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71 | =head1 METHODS |
72 | |
73 | =over 4 |
74 | |
75 | =item dispatch |
76 | |
77 | This method overrides the default dispatch mechanism to the re-dispatching |
78 | mechanism described above. |
79 | |
80 | =cut |
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81 | |
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82 | sub dispatch { |
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83 | my $self = shift; |
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84 | my $c = shift; |
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85 | |
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86 | my $rest_method = $self->name . "_" . uc( $c->request->method ); |
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87 | |
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88 | return $self->_dispatch_rest_method( $c, $rest_method ); |
89 | } |
90 | |
91 | sub _dispatch_rest_method { |
92 | my $self = shift; |
93 | my $c = shift; |
94 | my $rest_method = shift; |
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95 | my $req = $c->request; |
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96 | |
97 | my $controller = $c->component( $self->class ); |
98 | |
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99 | my ($code, $name); |
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100 | |
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101 | # Execute normal 'foo' action. |
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102 | $c->execute( $self->class, $self, @{ $req->args } ); |
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103 | |
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104 | # Common case, for foo_GET etc |
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105 | if ( $code = $controller->action_for($rest_method) ) { |
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106 | return $c->forward( $code, $req->args ); # Forward to foo_GET if it's an action |
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107 | } |
108 | elsif ($code = $controller->can($rest_method)) { |
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109 | $name = $rest_method; # Stash name and code to run 'foo_GET' like an action below. |
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110 | } |
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111 | |
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112 | # Generic handling for foo_* |
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113 | if (!$code) { |
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114 | my $code_action = { |
115 | OPTIONS => sub { |
116 | $name = $rest_method; |
117 | $code = sub { $self->_return_options($self->name, @_) }; |
118 | }, |
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119 | HEAD => sub { |
120 | $rest_method =~ s{_HEAD$}{_GET}i; |
121 | $self->_dispatch_rest_method($c, $rest_method); |
122 | }, |
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123 | default => sub { |
124 | # Otherwise, not implemented. |
125 | $name = $self->name . "_not_implemented"; |
126 | $code = $controller->can($name) # User method |
127 | # Generic not implemented |
128 | || sub { $self->_return_not_implemented($self->name, @_) }; |
129 | }, |
130 | }; |
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131 | my ( $http_method, $action_name ) = ( $rest_method, $self->name ); |
132 | $http_method =~ s{\Q$action_name\E\_}{}; |
133 | my $respond = ($code_action->{$http_method} |
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134 | || $code_action->{'default'})->(); |
135 | return $respond unless $name; |
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136 | } |
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137 | |
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138 | # localise stuff so we can dispatch the action 'as normal, but get |
139 | # different stats shown, and different code run. |
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140 | # Also get the full path for the action, and make it look like a forward |
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141 | local $self->{code} = $code; |
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142 | my @name = split m{/}, $self->reverse; |
143 | $name[-1] = $name; |
144 | local $self->{reverse} = "-> " . join('/', @name); |
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145 | |
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146 | $c->execute( $self->class, $self, @{ $req->args } ); |
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147 | } |
148 | |
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149 | sub get_allowed_methods { |
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150 | my ( $self, $controller, $c, $name ) = @_; |
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151 | my $class = ref($controller) ? ref($controller) : $controller; |
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152 | my $methods = { |
153 | map { /^$name\_(.+)$/ ? ( $1 => 1 ) : () } |
154 | @{ Class::Inspector->methods($class) } |
155 | }; |
156 | $methods->{'HEAD'} = 1 if $methods->{'GET'}; |
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157 | delete $methods->{'not_implemented'}; |
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158 | return sort keys %$methods; |
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159 | }; |
160 | |
161 | sub _return_options { |
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162 | my ( $self, $method_name, $controller, $c) = @_; |
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163 | my @allowed = $self->get_allowed_methods($controller, $c, $method_name); |
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164 | $c->response->content_type('text/plain'); |
165 | $c->response->status(200); |
166 | $c->response->header( 'Allow' => \@allowed ); |
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167 | $c->response->body(q{}); |
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168 | } |
169 | |
170 | sub _return_not_implemented { |
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171 | my ( $self, $method_name, $controller, $c ) = @_; |
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172 | |
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173 | my @allowed = $self->get_allowed_methods($controller, $c, $method_name); |
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174 | $c->response->content_type('text/plain'); |
175 | $c->response->status(405); |
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176 | $c->response->header( 'Allow' => \@allowed ); |
177 | $c->response->body( "Method " |
178 | . $c->request->method |
179 | . " not implemented for " |
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180 | . $c->uri_for( $method_name ) ); |
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181 | } |
182 | |
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183 | __PACKAGE__->meta->make_immutable; |
184 | |
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185 | 1; |
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186 | |
187 | =back |
188 | |
189 | =head1 SEE ALSO |
190 | |
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191 | You likely want to look at L<Catalyst::Controller::REST>, which implements a |
192 | sensible set of defaults for a controller doing REST. |
193 | |
194 | This class automatically adds the L<Catalyst::TraitFor::Request::REST> role to |
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195 | your request class. If you're writing a web application which provides RESTful |
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196 | responses and still needs to accommodate web browsers, you may prefer to use |
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197 | L<Catalyst::TraitFor::Request::REST::ForBrowsers> instead. |
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198 | |
199 | L<Catalyst::Action::Serialize>, L<Catalyst::Action::Deserialize> |
200 | |
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201 | =head1 TROUBLESHOOTING |
202 | |
203 | =over 4 |
204 | |
205 | =item Q: I'm getting a "415 Unsupported Media Type" error. What gives?! |
206 | |
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207 | A: Most likely, you haven't set Content-type equal to "application/json", or |
208 | one of the accepted return formats. You can do this by setting it in your query |
209 | accepted return formats. You can do this by setting it in your query string |
210 | thusly: C<< ?content-type=application%2Fjson (where %2F == / uri escaped). >> |
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211 | |
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212 | B<NOTE> Apache will refuse %2F unless configured otherwise. |
213 | Make sure C<AllowEncodedSlashes On> is in your httpd.conf file in order |
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214 | for this to run smoothly. |
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215 | |
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216 | =back |
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217 | |
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218 | =head1 AUTHOR |
219 | |
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220 | Adam Jacob E<lt>adam@stalecoffee.orgE<gt>, with lots of help from mst and jrockway |
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221 | |
222 | Marchex, Inc. paid me while I developed this module. (L<http://www.marchex.com>) |
223 | |
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224 | =head1 CONTRIBUTORS |
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225 | |
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226 | Tomas Doran (t0m) E<lt>bobtfish@bobtfish.netE<gt> |
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227 | |
228 | John Goulah |
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229 | |
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230 | Christopher Laco |
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231 | |
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232 | Daisuke Maki E<lt>daisuke@endeworks.jpE<gt> |
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233 | |
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234 | Hans Dieter Pearcey |
235 | |
16b5133c |
236 | Brian Phillips E<lt>bphillips@cpan.orgE<gt> |
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237 | |
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238 | Dave Rolsky E<lt>autarch@urth.orgE<gt> |
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239 | |
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240 | Luke Saunders |
241 | |
242 | Arthur Axel "fREW" Schmidt E<lt>frioux@gmail.comE<gt> |
243 | |
244 | J. Shirley E<lt>jshirley@gmail.comE<gt> |
245 | |
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246 | Gavin Henry E<lt>ghenry@surevoip.co.ukE<gt> |
247 | |
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248 | Gerv http://www.gerv.net/ |
249 | |
250 | Colin Newell <colin@opusvl.com> |
251 | |
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252 | Wallace Reis E<lt>wreis@cpan.orgE<gt> |
253 | |
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254 | =head1 COPYRIGHT |
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255 | |
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256 | Copyright (c) 2006-2012 the above named AUTHOR and CONTRIBUTORS |
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257 | |
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258 | =head1 LICENSE |
259 | |
260 | You may distribute this code under the same terms as Perl itself. |
261 | |
262 | =cut |
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263 | |