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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: 10/13/2006 03:54:33 PM PDT |
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5 | package Catalyst::Request::REST; |
6 | |
7 | use strict; |
8 | use warnings; |
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9 | use Scalar::Util qw/blessed/; |
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10 | |
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11 | use base qw/Catalyst::Request Class::Accessor::Fast/; |
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12 | |
13 | use Catalyst::Utils; |
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14 | use HTTP::Headers::Util qw(split_header_words); |
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15 | |
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16 | sub _insert_self_into { |
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17 | my ($class, $app_class ) = @_; |
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18 | # the fallback to $app_class is for the (rare and deprecated) case when |
19 | # people are defining actions in MyApp.pm instead of in a controller. |
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20 | my $app = (blessed($app_class) && $app_class->can('_application')) |
21 | ? $app_class->_application : Catalyst::Utils::class2appclass( $app_class ) || $app_class; |
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22 | |
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23 | my $req_class = $app->request_class; |
24 | return if $req_class->isa($class); |
25 | if ($req_class eq 'Catalyst::Request') { |
26 | $app->request_class($class); |
27 | } else { |
28 | die "$app has a custom request class $req_class, " |
29 | . "which is not a $class; see Catalyst::Request::REST"; |
30 | } |
31 | } |
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32 | |
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33 | __PACKAGE__->mk_accessors(qw(data accept_only)); |
34 | |
35 | sub accepted_content_types { |
36 | my $self = shift; |
37 | |
38 | return $self->{content_types} if $self->{content_types}; |
39 | |
40 | my %types; |
41 | |
42 | # First, we use the content type in the HTTP Request. It wins all. |
43 | $types{ $self->content_type } = 3 |
44 | if $self->content_type; |
45 | |
46 | if ($self->method eq "GET" && $self->param('content-type')) { |
47 | $types{ $self->param('content-type') } = 2; |
48 | } |
49 | |
50 | # Third, we parse the Accept header, and see if the client |
51 | # takes a format we understand. |
52 | # |
53 | # This is taken from chansen's Apache2::UploadProgress. |
54 | if ( $self->header('Accept') ) { |
55 | $self->accept_only(1) unless keys %types; |
56 | |
57 | my $accept_header = $self->header('Accept'); |
58 | my $counter = 0; |
59 | |
60 | foreach my $pair ( split_header_words($accept_header) ) { |
61 | my ( $type, $qvalue ) = @{$pair}[ 0, 3 ]; |
62 | next if $types{$type}; |
63 | |
64 | # cope with invalid (missing required q parameter) header like: |
65 | # application/json; charset="utf-8" |
66 | # http://tools.ietf.org/html/rfc2616#section-14.1 |
67 | unless ( defined $pair->[2] && lc $pair->[2] eq 'q' ) { |
68 | $qvalue = undef; |
69 | } |
70 | |
71 | unless ( defined $qvalue ) { |
72 | $qvalue = 1 - ( ++$counter / 1000 ); |
73 | } |
74 | |
75 | $types{$type} = sprintf( '%.3f', $qvalue ); |
76 | } |
77 | } |
78 | |
79 | return $self->{content_types} = |
80 | [ sort { $types{$b} <=> $types{$a} } keys %types ]; |
81 | } |
82 | |
83 | sub preferred_content_type { $_[0]->accepted_content_types->[0] } |
84 | |
85 | sub accepts { |
86 | my $self = shift; |
87 | my $type = shift; |
88 | |
89 | return grep { $_ eq $type } @{ $self->accepted_content_types }; |
90 | } |
91 | |
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92 | =head1 NAME |
93 | |
94 | Catalyst::Request::REST - A REST-y subclass of Catalyst::Request |
95 | |
96 | =head1 SYNOPSIS |
97 | |
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98 | if ( $c->request->accepts('application/json') ) { |
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99 | ... |
100 | } |
101 | |
102 | my $types = $c->request->accepted_content_types(); |
103 | |
104 | =head1 DESCRIPTION |
105 | |
106 | This is a subclass of C<Catalyst::Request> that adds a few methods to |
107 | the request object to faciliate writing REST-y code. Currently, these |
108 | methods are all related to the content types accepted by the client. |
109 | |
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110 | Note that if you have a custom request class in your application, and it does |
111 | not inherit from C<Catalyst::Request::REST>, your application will fail with an |
112 | error indicating a conflict the first time it tries to use |
113 | C<Catalyst::Request::REST>'s functionality. To fix this error, make sure your |
114 | custom request class inherits from C<Catalyst::Request::REST>. |
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115 | |
116 | =head1 METHODS |
117 | |
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118 | =over |
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119 | |
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120 | =item data |
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121 | |
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122 | If the request went through the Deserializer action, this method will |
123 | return the deserialized data structure. |
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124 | |
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125 | =item accepted_content_types |
126 | |
127 | Returns an array reference of content types accepted by the |
128 | client. |
129 | |
130 | The list of types is created by looking at the following sources: |
131 | |
132 | =over 8 |
133 | |
134 | =item * Content-type header |
135 | |
136 | If this exists, this will always be the first type in the list. |
137 | |
138 | =item * content-type parameter |
139 | |
140 | If the request is a GET request and there is a "content-type" |
141 | parameter in the query string, this will come before any types in the |
142 | Accept header. |
143 | |
144 | =item * Accept header |
145 | |
146 | This will be parsed and the types found will be ordered by the |
147 | relative quality specified for each type. |
148 | |
149 | =back |
150 | |
151 | If a type appears in more than one of these places, it is ordered based on |
152 | where it is first found. |
153 | |
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154 | =item preferred_content_type |
155 | |
156 | This returns the first content type found. It is shorthand for: |
157 | |
158 | $request->accepted_content_types->[0] |
159 | |
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160 | =item accepts($type) |
161 | |
162 | Given a content type, this returns true if the type is accepted. |
163 | |
164 | Note that this does not do any wildcard expansion of types. |
165 | |
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166 | =back |
167 | |
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168 | =head1 AUTHOR |
169 | |
170 | Adam Jacob <adam@stalecoffee.org>, with lots of help from mst and jrockway |
171 | |
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172 | =head1 MAINTAINER |
173 | |
174 | J. Shirley <jshirley@cpan.org> |
175 | |
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176 | =head1 LICENSE |
177 | |
178 | You may distribute this code under the same terms as Perl itself. |
179 | |
180 | =cut |
181 | |
182 | 1; |