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1 | package Catalyst::View::ContentNegotiation::XHTML; |
2 | |
3 | use Moose::Role; |
4 | use MooseX::Types::Moose qw/Num Str ArrayRef/; |
5 | use MooseX::Types::Structured qw/Tuple/; |
6 | use HTTP::Negotiate qw/choose/; |
7 | |
8 | use namespace::clean -except => 'meta'; |
9 | |
10 | # Remember to bump $VERSION in View::TT::XHTML also. |
11 | our $VERSION = '1.100'; |
12 | |
13 | requires 'process'; |
14 | |
15 | has variants => ( |
16 | is => 'ro', |
17 | isa => ArrayRef[Tuple[Str, Num, Str]], |
18 | lazy => 1, |
19 | builder => '_build_variants', |
20 | ); |
21 | |
22 | sub _build_variants { |
23 | return [ |
24 | [qw| xhtml 1.000 application/xhtml+xml |], |
25 | [qw| html 0.900 text/html |], |
26 | ]; |
27 | } |
28 | |
29 | after process => sub { |
30 | my ($self, $c) = @_; |
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31 | if ( my $accept = $self->pragmatic_accept($c) and $c->response->headers->{'content-type'} =~ m|text/html|) { |
32 | my $headers = $c->request->headers->clone; |
33 | $headers->header('Accept' => $accept); |
34 | if ( choose($self->variants, $headers) eq 'xhtml') { |
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35 | $c->response->headers->{'content-type'} =~ s|text/html|application/xhtml+xml|; |
36 | } |
37 | } |
38 | }; |
39 | |
40 | sub pragmatic_accept { |
41 | my ($self, $c) = @_; |
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42 | my $accept = $c->request->header('Accept') or return; |
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43 | if ($accept =~ m|text/html|) { |
44 | $accept =~ s!\*/\*\s*([,]+|$)!*/*;q=0.5$1!; |
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45 | } |
46 | else { |
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47 | $accept =~ s!\*/\*\s*([,]+|$)!text/html,*/*;q=0.5$1!; |
48 | } |
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49 | return $accept; |
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50 | } |
51 | |
52 | 1; |
53 | |
54 | __END__ |
55 | |
56 | =head1 NAME |
57 | |
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58 | Catalyst::View::ContentNegotiation::XHTML - Adjusts the |
59 | response Content-Type header to application/xhtml+xml |
60 | if the browser accepts it. |
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61 | |
62 | =head1 SYNOPSIS |
63 | |
64 | package Catalyst::View::TT; |
65 | |
66 | use Moose; |
67 | use namespace::clean -except => 'meta'; |
68 | |
69 | extends qw/Catalyst::View::TT/; |
70 | with qw/Catalyst::View::ContentNegotiation::XHTML/; |
71 | |
72 | 1; |
73 | |
74 | =head1 DESCRIPTION |
75 | |
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76 | This is a simple Role which sets the response C<Content-Type> to be |
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77 | C<application/xhtml+xml> if the users browser sends an C<Accept> header |
78 | indicating that it is willing to process that MIME type. |
79 | |
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80 | Changing the C<Content-Type> to C<application/xhtml+xml> causes |
81 | browsers to interpret the page as XML, meaning that your markup must |
82 | be well formed. |
83 | |
84 | =head1 CAVEATS |
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85 | |
86 | This is useful when you're developing your application, as you know that |
87 | all pages you view are parsed as XML, so any errors caused by your markup |
88 | not being well-formed will show up at once. |
89 | |
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90 | Whilst this module is has been tested against most popular browsers including |
91 | Internet Explorer, it may cause unexpected results on browsers which do not |
92 | properly support the C<application/xhtml+xml> MIME type. |
93 | |
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94 | =head1 METHOD MODIFIERS |
95 | |
96 | =head2 after process |
97 | |
98 | Changes the response C<Content-Type> if appropriate (from the requests C<Accept> header). |
99 | |
100 | =head1 METHODS |
101 | |
102 | =head2 pragmatic_accept |
103 | |
104 | Some browsers (such as Internet Explorer) have a nasty way of sending |
105 | Accept */* and this claiming to support XHTML just as well as HTML. |
106 | Saving to a file on disk or opening with another application does |
107 | count as accepting, but it really should have a lower q value then |
108 | text/html. This sub takes a pragmatic approach and corrects this mistake |
109 | by modifying the Accept header before passing it to content negotiation. |
110 | |
111 | =head1 ATTRIBUTES |
112 | |
113 | =head2 variants |
114 | |
115 | Returns an array ref of 3 part arrays, comprising name, priority, output |
116 | mime-type, which is used for the content negotiation algorithm. |
117 | |
118 | =head1 PRIVATE METHODS |
119 | |
120 | =head2 _build_variants |
121 | |
122 | Returns the default variant attribute contents. |
123 | |
124 | =head1 SEE ALSO |
125 | |
126 | =over |
127 | |
128 | =item L<Catalyst::View::TT::XHTML> - Trivial Catalyst TT view using this role. |
129 | |
130 | =item L<http://www.w3.org/Protocols/rfc2616/rfc2616-sec12.html> - Content negotiation RFC. |
131 | |
132 | =back |
133 | |
134 | =head1 BUGS |
135 | |
136 | Should be split into a base ContentNegotiation role which is consumed by ContentNegotiation::XHTML. |
137 | |
138 | =head1 AUTHOR |
139 | |
140 | Tomas Doran (t0m) C<< <bobtfish@bobtfish.net> >> |
141 | |
142 | =head1 CONTRIBUTORS |
143 | |
144 | =over |
145 | |
146 | =item David Dorward - test patches and */* pragmatism. |
147 | |
148 | =item Florian Ragwitz (rafl) C<< <rafl@debian.org> >> - Conversion into a Moose Role |
149 | |
150 | =back |
151 | |
152 | =head1 COPYRIGHT |
153 | |
154 | This module itself is copyright (c) 2008 Tomas Doran and is licensed under the same terms as Perl itself. |
155 | |
156 | =cut |