Profile of Plack/App/URLMap.pm

Filename	/usr/share/perl5/Plack/App/URLMap.pm
Statements	Executed 0 statements in 0s

Line	Calls	Time in subs	Code
1			package Plack::App::URLMap;
2			use strict;
3			use warnings;
4			use parent qw(Plack::Component);
5			use constant DEBUG => $ENV{PLACK_URLMAP_DEBUG};
6
7			use Carp ();
8
9			sub mount { shift->map(@_) }
10
11			sub map {
12			my $self = shift;
13			my($location, $app) = @_;
14
15			my $host;
16			if ($location =~ m!^https?://(.?)(/.)!) {
17			$host = $1;
18			$location = $2;
19			}
20
21			if ($location !~ m!^/!) {
22			Carp::croak("Paths need to start with /");
23			}
24			$location =~ s!/$!!;
25
26			push @{$self->{_mapping}}, [ $host, $location, qr/^\Q$location\E/, $app ];
27			}
28
29			sub prepare_app {
30			my $self = shift;
31			# sort by path length
32			$self->{_sorted_mapping} = [
33			map { [ @{$_}[2..5] ] }
34			sort { $b->[0] <=> $a->[0] \|\| $b->[1] <=> $a->[1] }
35			map { [ ($_->[0] ? length $_->[0] : 0), length($_->[1]), @$_ ] } @{$self->{_mapping}},
36			];
37			}
38
39			sub call {
40			my ($self, $env) = @_;
41
42			my $path_info = $env->{PATH_INFO};
43			my $script_name = $env->{SCRIPT_NAME};
44
45			my($http_host, $server_name) = @{$env}{qw( HTTP_HOST SERVER_NAME )};
46
47			if ($http_host and my $port = $env->{SERVER_PORT}) {
48			$http_host =~ s/:$port$//;
49			}
50
51			for my $map (@{ $self->{_sorted_mapping} }) {
52			my($host, $location, $location_re, $app) = @$map;
53			my $path = $path_info; # copy
54			no warnings 'uninitialized';
55			DEBUG && warn "Matching request (Host=$http_host Path=$path) and the map (Host=$host Path=$location)\n";
56			next unless not defined $host or
57			$http_host eq $host or
58			$server_name eq $host;
59			next unless $location eq '' or $path =~ s!$location_re!!;
60			next unless $path eq '' or $path =~ m!^/!;
61			DEBUG && warn "-> Matched!\n";
62
63			my $orig_path_info = $env->{PATH_INFO};
64			my $orig_script_name = $env->{SCRIPT_NAME};
65
66			$env->{PATH_INFO} = $path;
67			$env->{SCRIPT_NAME} = $script_name . $location;
68			return $self->response_cb($app->($env), sub {
69			$env->{PATH_INFO} = $orig_path_info;
70			$env->{SCRIPT_NAME} = $orig_script_name;
71	3	160µs	}); # spent 160µs making 3 calls to Plack::Component::to_app_auto, avg 53µs/call
72			}
73
74			DEBUG && warn "All matching failed.\n";
75
76			return [404, [ 'Content-Type' => 'text/plain' ], [ "Not Found" ]];
77			}
78
79			1;
80
81			__END__
82
83			=head1 NAME
84
85			Plack::App::URLMap - Map multiple apps in different paths
86
87			=head1 SYNOPSIS
88
89			use Plack::App::URLMap;
90
91			my $app1 = sub { ... };
92			my $app2 = sub { ... };
93			my $app3 = sub { ... };
94
95			my $urlmap = Plack::App::URLMap->new;
96			$urlmap->map("/" => $app1);
97			$urlmap->map("/foo" => $app2);
98			$urlmap->map("http://bar.example.com/" => $app3);
99
100			my $app = $urlmap->to_app;
101
102			=head1 DESCRIPTION
103
104			Plack::App::URLMap is a PSGI application that can dispatch multiple
105			applications based on URL path and host names (a.k.a "virtual hosting")
106			and takes care of rewriting C<SCRIPT_NAME> and C<PATH_INFO> (See
107			L</"HOW THIS WORKS"> for details). This module is inspired by
108			Ruby's Rack::URLMap.
109
110			=head1 METHODS
111
112			=over 4
113
114			=item map
115
116			$urlmap->map("/foo" => $app);
117			$urlmap->map("http://bar.example.com/" => $another_app);
118
119			Maps URL path or an absolute URL to a PSGI application. The match
120			order is sorted by host name length and then path length (longest strings
121			first).
122
123			URL paths need to match from the beginning and should match completely
124			until the path separator (or the end of the path). For example, if you
125			register the path C</foo>, it I<will> match with the request C</foo>,
126			C</foo/> or C</foo/bar> but it I<won't> match with C</foox>.
127
128			Mapping URLs with host names is also possible, and in that case the URL
129			mapping works like a virtual host.
130
131			Mappings will nest. If $app is already mapped to C</baz> it will
132			match a request for C</foo/baz> but not C</foo>. See L</"HOW THIS
133			WORKS"> for more details.
134
135			=item mount
136
137			Alias for C<map>.
138
139			=item to_app
140
141			my $handler = $urlmap->to_app;
142
143			Returns the PSGI application code reference. Note that the
144			Plack::App::URLMap object is callable (by overloading the code
145			dereference), so returning the object itself as a PSGI application
146			should also work.
147
148			=back
149
150			=head1 PERFORMANCE
151
152			If you C<map> (or C<mount> with Plack::Builder) N applications,
153			Plack::App::URLMap will need to at most iterate through N paths to
154			match incoming requests.
155
156			It is a good idea to use C<map> only for a known, limited amount of
157			applications, since mounting hundreds of applications could affect
158			runtime request performance.
159
160			=head1 DEBUGGING
161
162			You can set the environment variable C<PLACK_URLMAP_DEBUG> to see how
163			this application matches with the incoming request host names and
164			paths.
165
166			=head1 HOW THIS WORKS
167
168			This application works by I<fixing> C<SCRIPT_NAME> and C<PATH_INFO>
169			before dispatching the incoming request to the relocated
170			applications.
171
172			Say you have a Wiki application that takes C</index> and C</page/*>
173			and makes a PSGI application C<$wiki_app> out of it, using one of
174			supported web frameworks, you can put the whole application under
175			C</wiki> by:
176
177			# MyWikiApp looks at PATH_INFO and handles /index and /page/*
178			my $wiki_app = sub { MyWikiApp->run(@_) };
179
180			use Plack::App::URLMap;
181			my $app = Plack::App::URLMap->new;
182			$app->mount("/wiki" => $wiki_app);
183
184			When a request comes in with C<PATH_INFO> set to C</wiki/page/foo>,
185			the URLMap application C<$app> strips the C</wiki> part from
186			C<PATH_INFO> and B<appends> that to C<SCRIPT_NAME>.
187
188			That way, if the C<$app> is mounted under the root
189			(i.e. C<SCRIPT_NAME> is C<"">) with standalone web servers like
190			L<Starman>, C<SCRIPT_NAME> is now locally set to C</wiki> and
191			C<PATH_INFO> is changed to C</page/foo> when C<$wiki_app> gets called.
192
193			=head1 AUTHOR
194
195			Tatsuhiko Miyagawa
196
197			=head1 SEE ALSO
198
199			L<Plack::Builder>
200
201			=cut