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1 | package Catalyst::TraitFor::Request::REST; |
2 | use Moose::Role; |
3 | use HTTP::Headers::Util qw(split_header_words); |
4 | use namespace::autoclean; |
5 | |
6 | has [qw/ data accept_only /] => ( is => 'rw' ); |
7 | |
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8 | has accepted_content_types => ( |
9 | is => 'ro', |
10 | isa => 'ArrayRef', |
11 | lazy => 1, |
12 | builder => '_build_accepted_content_types', |
13 | init_arg => undef, |
14 | ); |
15 | |
16 | has preferred_content_type => ( |
17 | is => 'ro', |
18 | isa => 'Str', |
19 | lazy => 1, |
20 | builder => '_build_preferred_content_type', |
21 | init_arg => undef, |
22 | ); |
23 | |
24 | sub _build_accepted_content_types { |
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25 | my $self = shift; |
26 | |
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27 | my %types; |
28 | |
29 | # First, we use the content type in the HTTP Request. It wins all. |
30 | $types{ $self->content_type } = 3 |
31 | if $self->content_type; |
32 | |
33 | if ($self->method eq "GET" && $self->param('content-type')) { |
34 | $types{ $self->param('content-type') } = 2; |
35 | } |
36 | |
37 | # Third, we parse the Accept header, and see if the client |
38 | # takes a format we understand. |
39 | # |
40 | # This is taken from chansen's Apache2::UploadProgress. |
41 | if ( $self->header('Accept') ) { |
42 | $self->accept_only(1) unless keys %types; |
43 | |
44 | my $accept_header = $self->header('Accept'); |
45 | my $counter = 0; |
46 | |
47 | foreach my $pair ( split_header_words($accept_header) ) { |
48 | my ( $type, $qvalue ) = @{$pair}[ 0, 3 ]; |
49 | next if $types{$type}; |
50 | |
51 | # cope with invalid (missing required q parameter) header like: |
52 | # application/json; charset="utf-8" |
53 | # http://tools.ietf.org/html/rfc2616#section-14.1 |
54 | unless ( defined $pair->[2] && lc $pair->[2] eq 'q' ) { |
55 | $qvalue = undef; |
56 | } |
57 | |
58 | unless ( defined $qvalue ) { |
59 | $qvalue = 1 - ( ++$counter / 1000 ); |
60 | } |
61 | |
62 | $types{$type} = sprintf( '%.3f', $qvalue ); |
63 | } |
64 | } |
65 | |
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66 | [ sort { $types{$b} <=> $types{$a} } keys %types ]; |
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67 | } |
68 | |
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69 | sub _build_preferred_content_type { $_[0]->accepted_content_types->[0] } |
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70 | |
71 | sub accepts { |
72 | my $self = shift; |
73 | my $type = shift; |
74 | |
75 | return grep { $_ eq $type } @{ $self->accepted_content_types }; |
76 | } |
77 | |
78 | 1; |
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79 | __END__ |
80 | |
81 | =head1 NAME |
82 | |
83 | Catalyst::TraitFor::Request::REST - A role to apply to Catalyst::Request giving it REST methods and attributes. |
84 | |
85 | =head1 SYNOPSIS |
86 | |
87 | if ( $c->request->accepts('application/json') ) { |
88 | ... |
89 | } |
90 | |
91 | my $types = $c->request->accepted_content_types(); |
92 | |
93 | =head1 DESCRIPTION |
94 | |
95 | This is a L<Moose::Role> applied to L<Catalyst::Request> that adds a few |
96 | methods to the request object to faciliate writing REST-y code. |
97 | Currently, these methods are all related to the content types accepted by |
98 | the client. |
99 | |
100 | =head1 METHODS |
101 | |
102 | =over |
103 | |
104 | =item data |
105 | |
106 | If the request went through the Deserializer action, this method will |
107 | return the deserialized data structure. |
108 | |
109 | =item accepted_content_types |
110 | |
111 | Returns an array reference of content types accepted by the |
112 | client. |
113 | |
114 | The list of types is created by looking at the following sources: |
115 | |
116 | =over 8 |
117 | |
118 | =item * Content-type header |
119 | |
120 | If this exists, this will always be the first type in the list. |
121 | |
122 | =item * content-type parameter |
123 | |
124 | If the request is a GET request and there is a "content-type" |
125 | parameter in the query string, this will come before any types in the |
126 | Accept header. |
127 | |
128 | =item * Accept header |
129 | |
130 | This will be parsed and the types found will be ordered by the |
131 | relative quality specified for each type. |
132 | |
133 | =back |
134 | |
135 | If a type appears in more than one of these places, it is ordered based on |
136 | where it is first found. |
137 | |
138 | =item preferred_content_type |
139 | |
140 | This returns the first content type found. It is shorthand for: |
141 | |
142 | $request->accepted_content_types->[0] |
143 | |
144 | =item accepts($type) |
145 | |
146 | Given a content type, this returns true if the type is accepted. |
147 | |
148 | Note that this does not do any wildcard expansion of types. |
149 | |
150 | =back |
151 | |
152 | =head1 AUTHORS |
153 | |
154 | See L<Catalyst::Action::REST> for authors. |
155 | |
156 | =head1 LICENSE |
157 | |
158 | You may distribute this code under the same terms as Perl itself. |
159 | |
160 | =cut |
161 | |