Commit | Line | Data |
06190e8b |
1 | package Plack::Session::State; |
2 | use strict; |
3 | use warnings; |
4 | |
30cc0a71 |
5 | our $VERSION = '0.01'; |
6 | our $AUTHORITY = 'cpan:STEVAN'; |
7 | |
3b4205cd |
8 | use Digest::SHA1 (); |
9 | |
ac4892f4 |
10 | use Plack::Util::Accessor qw[ |
11 | session_key |
12 | sid_generator |
6a695f07 |
13 | sid_validator |
ac4892f4 |
14 | ]; |
06190e8b |
15 | |
16 | sub new { |
17 | my ($class, %params) = @_; |
ac4892f4 |
18 | |
19 | $params{'_expired'} ||= +{}; |
20 | $params{'session_key'} ||= 'plack_session'; |
21 | $params{'sid_generator'} ||= sub { |
ac4892f4 |
22 | Digest::SHA1::sha1_hex(rand() . $$ . {} . time) |
23 | }; |
6a695f07 |
24 | $params{'sid_validator'} ||= qr/\A[0-9a-f]{40}\Z/; |
ac4892f4 |
25 | |
26 | bless { %params } => $class; |
06190e8b |
27 | } |
28 | |
29 | sub expire_session_id { |
30 | my ($self, $id) = @_; |
ac4892f4 |
31 | $self->{'_expired'}->{ $id }++; |
06190e8b |
32 | } |
33 | |
05b5f99d |
34 | sub is_session_expired { |
35 | my ($self, $id) = @_; |
36 | exists $self->{'_expired'}->{ $id } |
37 | } |
38 | |
bd992981 |
39 | sub check_expired { |
40 | my ($self, $id) = @_; |
ae35574f |
41 | return if $self->is_session_expired( $id ); |
06190e8b |
42 | return $id; |
43 | } |
44 | |
ae35574f |
45 | sub validate_session_id { |
46 | my ($self, $id) = @_; |
47 | $id =~ $self->sid_validator; |
56b9910a |
48 | } |
49 | |
06190e8b |
50 | sub get_session_id { |
51 | my ($self, $request) = @_; |
ae35574f |
52 | $self->extract( $request ) |
06190e8b |
53 | || |
bd992981 |
54 | $self->generate( $request ) |
55 | } |
56 | |
ae35574f |
57 | sub get_session_id_from_request { |
58 | my ($self, $request) = @_; |
56b9910a |
59 | $request->param( $self->session_key ); |
60 | } |
61 | |
bd992981 |
62 | sub extract { |
63 | my ($self, $request) = @_; |
56b9910a |
64 | |
ae35574f |
65 | my $id = $self->get_session_id_from_request( $request ); |
66 | return unless defined $id; |
67 | |
68 | $self->validate_session_id( $id ) |
69 | && |
70 | $self->check_expired( $id ); |
bd992981 |
71 | } |
72 | |
fe1bfe7d |
73 | sub generate { |
74 | my $self = shift; |
ac4892f4 |
75 | $self->sid_generator->( @_ ); |
bd992981 |
76 | } |
77 | |
fe1bfe7d |
78 | |
bd992981 |
79 | sub finalize { |
80 | my ($self, $id, $response) = @_; |
81 | (); |
06190e8b |
82 | } |
83 | |
fe1bfe7d |
84 | 1; |
ac4892f4 |
85 | |
86 | __END__ |
87 | |
88 | =pod |
89 | |
90 | =head1 NAME |
91 | |
92 | Plack::Session::State - Basic parameter-based session state |
93 | |
3d92cf47 |
94 | =head1 SYNOPSIS |
95 | |
96 | use Plack::Builder; |
97 | use Plack::Middleware::Session; |
98 | use Plack::Session::State; |
99 | |
100 | my $app = sub { |
101 | return [ 200, [ 'Content-Type' => 'text/plain' ], [ 'Hello Foo' ] ]; |
102 | }; |
103 | |
104 | builder { |
105 | enable 'Session', |
106 | state => Plack::Session::State->new; |
107 | $app; |
108 | }; |
109 | |
ac4892f4 |
110 | =head1 DESCRIPTION |
111 | |
3d92cf47 |
112 | This will maintain session state by passing the session through |
113 | the request params. It does not do this automatically though, |
114 | you are responsible for passing the session param. |
115 | |
116 | This should be considered the state "base" class (although |
117 | subclassing is not a requirement) and defines the spec for |
118 | all B<Plack::Session::State::*> modules. You will only |
119 | need to override a couple methods if you do subclass. See |
120 | L<Plack::Session::State::Cookie> for an example of this. |
121 | |
ac4892f4 |
122 | =head1 METHODS |
123 | |
124 | =over 4 |
125 | |
126 | =item B<new ( %params )> |
127 | |
56b9910a |
128 | The C<%params> can include I<session_key>, I<sid_generator> and I<sid_checker> |
3d92cf47 |
129 | however in both cases a default will be provided for you. |
130 | |
ac4892f4 |
131 | =item B<session_key> |
132 | |
43f34c01 |
133 | This is the name of the session key, it default to 'plack_session'. |
134 | |
ac4892f4 |
135 | =item B<sid_generator> |
136 | |
3d92cf47 |
137 | This is a CODE ref used to generate unique session ids, by default |
138 | it will generate a SHA1 using fairly sufficient entropy. If you are |
139 | concerned or interested, just read the source. |
43f34c01 |
140 | |
6a695f07 |
141 | =item B<sid_validator> |
56b9910a |
142 | |
ae35574f |
143 | This is a regex used to validate requested session id. |
56b9910a |
144 | |
ac4892f4 |
145 | =back |
146 | |
43f34c01 |
147 | =head2 Session ID Managment |
148 | |
ac4892f4 |
149 | =over 4 |
150 | |
151 | =item B<get_session_id ( $request )> |
152 | |
43f34c01 |
153 | Given a C<$request> this will first attempt to extract the session, |
154 | if the is expired or does not exist, it will then generate a new |
155 | session. The C<$request> is expected to be a L<Plack::Request> instance |
156 | or an object with an equivalent interface. |
157 | |
ae35574f |
158 | =item B<get_session_id_from_request ( $request )> |
159 | |
160 | This is the method used to extract the session id from a C<$request>. |
161 | Subclasses will often only need to override this method and the |
162 | C<finalize> method. |
163 | |
164 | =item B<validate_session_id ( $session_id )> |
165 | |
166 | This will use the C<sid_validator> regex and confirm that the |
167 | C<$session_id> is valid. |
6a695f07 |
168 | |
ac4892f4 |
169 | =item B<extract ( $request )> |
170 | |
43f34c01 |
171 | This will attempt to extract the session from a C<$request> by looking |
172 | for the C<session_key> in the C<$request> params. It will then check to |
a45f272f |
173 | see if the session is valid and that it has not expired. It will return |
174 | the session id if everything is good or undef otherwise. The C<$request> |
175 | is expected to be a L<Plack::Request> instance or an object with an |
176 | equivalent interface. |
43f34c01 |
177 | |
ac4892f4 |
178 | =item B<generate ( $request )> |
179 | |
43f34c01 |
180 | This will generate a new session id using the C<sid_generator> callback. |
181 | The C<$request> argument is not used by this method but is there for |
182 | use by subclasses. The C<$request> is expected to be a L<Plack::Request> |
183 | instance or an object with an equivalent interface. |
184 | |
ac4892f4 |
185 | =item B<finalize ( $session_id, $response )> |
186 | |
43f34c01 |
187 | Given a C<$session_id> and a C<$response> this will perform any |
188 | finalization nessecary to preserve state. This method is called by |
189 | the L<Plack::Session> C<finalize> method. The C<$response> is expected |
190 | to be a L<Plack::Response> instance or an object with an equivalent |
191 | interface. |
192 | |
ac4892f4 |
193 | =back |
194 | |
43f34c01 |
195 | =head2 Session Expiration Handling |
196 | |
ac4892f4 |
197 | =over 4 |
198 | |
199 | =item B<expire_session_id ( $id )> |
200 | |
43f34c01 |
201 | This will mark the session for C<$id> as expired. This method is called |
202 | by the L<Plack::Session> C<expire> method. |
203 | |
204 | =item B<is_session_expired ( $id )> |
205 | |
206 | This will check to see if the session C<$id> has been marked as |
207 | expired. |
208 | |
ac4892f4 |
209 | =item B<check_expired ( $id )> |
210 | |
43f34c01 |
211 | Given an session C<$id> this will return C<undef> if the session is |
212 | expired or return the C<$id> if it is not. |
213 | |
ac4892f4 |
214 | =back |
215 | |
216 | =head1 BUGS |
217 | |
218 | All complex software has bugs lurking in it, and this module is no |
219 | exception. If you find a bug please either email me, or add the bug |
220 | to cpan-RT. |
221 | |
222 | =head1 AUTHOR |
223 | |
224 | Stevan Little E<lt>stevan.little@iinteractive.comE<gt> |
225 | |
226 | =head1 COPYRIGHT AND LICENSE |
227 | |
228 | Copyright 2009 Infinity Interactive, Inc. |
229 | |
230 | L<http://www.iinteractive.com> |
231 | |
232 | This library is free software; you can redistribute it and/or modify |
233 | it under the same terms as Perl itself. |
234 | |
235 | =cut |
236 | |
237 | |