Commit | Line | Data |
06190e8b |
1 | package Plack::Session::State; |
2 | use strict; |
3 | use warnings; |
4 | |
3b4205cd |
5 | use Digest::SHA1 (); |
6 | |
ac4892f4 |
7 | use Plack::Util::Accessor qw[ |
8 | session_key |
9 | sid_generator |
56b9910a |
10 | sid_checker |
ac4892f4 |
11 | ]; |
06190e8b |
12 | |
13 | sub new { |
14 | my ($class, %params) = @_; |
ac4892f4 |
15 | |
16 | $params{'_expired'} ||= +{}; |
17 | $params{'session_key'} ||= 'plack_session'; |
18 | $params{'sid_generator'} ||= sub { |
ac4892f4 |
19 | Digest::SHA1::sha1_hex(rand() . $$ . {} . time) |
20 | }; |
56b9910a |
21 | $params{'sid_checker'} ||= qr/\A[0-9a-f]{40}\Z/; |
ac4892f4 |
22 | |
23 | bless { %params } => $class; |
06190e8b |
24 | } |
25 | |
26 | sub expire_session_id { |
27 | my ($self, $id) = @_; |
ac4892f4 |
28 | $self->{'_expired'}->{ $id }++; |
06190e8b |
29 | } |
30 | |
05b5f99d |
31 | sub is_session_expired { |
32 | my ($self, $id) = @_; |
33 | exists $self->{'_expired'}->{ $id } |
34 | } |
35 | |
bd992981 |
36 | sub check_expired { |
37 | my ($self, $id) = @_; |
05b5f99d |
38 | return unless $id && not $self->is_session_expired( $id ); |
06190e8b |
39 | return $id; |
40 | } |
41 | |
56b9910a |
42 | sub check_request_session_id { |
43 | my ($self, $request) = @_; |
44 | |
45 | my $reqest_session_id = $self->get_request_session_id($request); |
46 | my $sid_checker = $self->sid_checker; |
47 | |
48 | defined $reqest_session_id && $reqest_session_id =~ m{$sid_checker}; |
49 | } |
50 | |
06190e8b |
51 | sub get_session_id { |
52 | my ($self, $request) = @_; |
56b9910a |
53 | ( |
54 | $self->check_request_session_id($request) |
55 | && |
56 | $self->extract( $request ) |
57 | ) |
06190e8b |
58 | || |
bd992981 |
59 | $self->generate( $request ) |
60 | } |
61 | |
56b9910a |
62 | sub get_request_session_id { |
63 | my ($self, $request ) = @_; |
64 | |
65 | $request->param( $self->session_key ); |
66 | } |
67 | |
bd992981 |
68 | sub extract { |
69 | my ($self, $request) = @_; |
56b9910a |
70 | |
71 | $self->check_expired( $self->get_request_session_id($request) ); |
bd992981 |
72 | } |
73 | |
fe1bfe7d |
74 | sub generate { |
75 | my $self = shift; |
ac4892f4 |
76 | $self->sid_generator->( @_ ); |
bd992981 |
77 | } |
78 | |
fe1bfe7d |
79 | |
bd992981 |
80 | sub finalize { |
81 | my ($self, $id, $response) = @_; |
82 | (); |
06190e8b |
83 | } |
84 | |
fe1bfe7d |
85 | 1; |
ac4892f4 |
86 | |
87 | __END__ |
88 | |
89 | =pod |
90 | |
91 | =head1 NAME |
92 | |
93 | Plack::Session::State - Basic parameter-based session state |
94 | |
3d92cf47 |
95 | =head1 SYNOPSIS |
96 | |
97 | use Plack::Builder; |
98 | use Plack::Middleware::Session; |
99 | use Plack::Session::State; |
100 | |
101 | my $app = sub { |
102 | return [ 200, [ 'Content-Type' => 'text/plain' ], [ 'Hello Foo' ] ]; |
103 | }; |
104 | |
105 | builder { |
106 | enable 'Session', |
107 | state => Plack::Session::State->new; |
108 | $app; |
109 | }; |
110 | |
ac4892f4 |
111 | =head1 DESCRIPTION |
112 | |
3d92cf47 |
113 | This will maintain session state by passing the session through |
114 | the request params. It does not do this automatically though, |
115 | you are responsible for passing the session param. |
116 | |
117 | This should be considered the state "base" class (although |
118 | subclassing is not a requirement) and defines the spec for |
119 | all B<Plack::Session::State::*> modules. You will only |
120 | need to override a couple methods if you do subclass. See |
121 | L<Plack::Session::State::Cookie> for an example of this. |
122 | |
ac4892f4 |
123 | =head1 METHODS |
124 | |
125 | =over 4 |
126 | |
127 | =item B<new ( %params )> |
128 | |
56b9910a |
129 | The C<%params> can include I<session_key>, I<sid_generator> and I<sid_checker> |
3d92cf47 |
130 | however in both cases a default will be provided for you. |
131 | |
ac4892f4 |
132 | =item B<session_key> |
133 | |
43f34c01 |
134 | This is the name of the session key, it default to 'plack_session'. |
135 | |
ac4892f4 |
136 | =item B<sid_generator> |
137 | |
3d92cf47 |
138 | This is a CODE ref used to generate unique session ids, by default |
139 | it will generate a SHA1 using fairly sufficient entropy. If you are |
140 | concerned or interested, just read the source. |
43f34c01 |
141 | |
56b9910a |
142 | =item B<sid_checker> |
143 | |
144 | This is a regex used to check requested session id, |
145 | |
ac4892f4 |
146 | =back |
147 | |
43f34c01 |
148 | =head2 Session ID Managment |
149 | |
ac4892f4 |
150 | =over 4 |
151 | |
152 | =item B<get_session_id ( $request )> |
153 | |
43f34c01 |
154 | Given a C<$request> this will first attempt to extract the session, |
155 | if the is expired or does not exist, it will then generate a new |
156 | session. The C<$request> is expected to be a L<Plack::Request> instance |
157 | or an object with an equivalent interface. |
158 | |
ac4892f4 |
159 | =item B<extract ( $request )> |
160 | |
43f34c01 |
161 | This will attempt to extract the session from a C<$request> by looking |
162 | for the C<session_key> in the C<$request> params. It will then check to |
163 | see if the session has expired and return the session id if it is not. |
164 | The C<$request> is expected to be a L<Plack::Request> instance or an |
165 | object with an equivalent interface. |
166 | |
ac4892f4 |
167 | =item B<generate ( $request )> |
168 | |
43f34c01 |
169 | This will generate a new session id using the C<sid_generator> callback. |
170 | The C<$request> argument is not used by this method but is there for |
171 | use by subclasses. The C<$request> is expected to be a L<Plack::Request> |
172 | instance or an object with an equivalent interface. |
173 | |
ac4892f4 |
174 | =item B<finalize ( $session_id, $response )> |
175 | |
43f34c01 |
176 | Given a C<$session_id> and a C<$response> this will perform any |
177 | finalization nessecary to preserve state. This method is called by |
178 | the L<Plack::Session> C<finalize> method. The C<$response> is expected |
179 | to be a L<Plack::Response> instance or an object with an equivalent |
180 | interface. |
181 | |
ac4892f4 |
182 | =back |
183 | |
43f34c01 |
184 | =head2 Session Expiration Handling |
185 | |
ac4892f4 |
186 | =over 4 |
187 | |
188 | =item B<expire_session_id ( $id )> |
189 | |
43f34c01 |
190 | This will mark the session for C<$id> as expired. This method is called |
191 | by the L<Plack::Session> C<expire> method. |
192 | |
193 | =item B<is_session_expired ( $id )> |
194 | |
195 | This will check to see if the session C<$id> has been marked as |
196 | expired. |
197 | |
ac4892f4 |
198 | =item B<check_expired ( $id )> |
199 | |
43f34c01 |
200 | Given an session C<$id> this will return C<undef> if the session is |
201 | expired or return the C<$id> if it is not. |
202 | |
ac4892f4 |
203 | =back |
204 | |
205 | =head1 BUGS |
206 | |
207 | All complex software has bugs lurking in it, and this module is no |
208 | exception. If you find a bug please either email me, or add the bug |
209 | to cpan-RT. |
210 | |
211 | =head1 AUTHOR |
212 | |
213 | Stevan Little E<lt>stevan.little@iinteractive.comE<gt> |
214 | |
215 | =head1 COPYRIGHT AND LICENSE |
216 | |
217 | Copyright 2009 Infinity Interactive, Inc. |
218 | |
219 | L<http://www.iinteractive.com> |
220 | |
221 | This library is free software; you can redistribute it and/or modify |
222 | it under the same terms as Perl itself. |
223 | |
224 | =cut |
225 | |
226 | |