Commit | Line | Data |
9e447f9d |
1 | #!/usr/bin/perl |
2 | |
3 | package Catalyst::Plugin::Session; |
9e447f9d |
4 | |
fff59d60 |
5 | use Moose; |
6 | with 'MooseX::Emulate::Class::Accessor::Fast'; |
fe0d5ebe |
7 | use MRO::Compat; |
9e447f9d |
8 | use Catalyst::Exception (); |
9a9252c2 |
9 | use Digest (); |
10 | use overload (); |
d44bc687 |
11 | use Object::Signature (); |
0466f6c7 |
12 | use Carp; |
4bb2f00a |
13 | use List::Util qw/ max /; |
9e447f9d |
14 | |
c0c50a2c |
15 | use namespace::clean -except => 'meta'; |
16 | |
06d0ceb7 |
17 | our $VERSION = '0.37'; |
9a50355f |
18 | $VERSION = eval $VERSION; |
37160715 |
19 | |
ab634fee |
20 | my @session_data_accessors; # used in delete_session |
fff59d60 |
21 | |
22 | __PACKAGE__->mk_accessors( |
ab634fee |
23 | "_session_delete_reason", |
24 | @session_data_accessors = qw/ |
4207ce8d |
25 | _sessionid |
26 | _session |
27 | _session_expires |
260b14c4 |
28 | _extended_session_expires |
4207ce8d |
29 | _session_data_sig |
4207ce8d |
30 | _flash |
f4d79f85 |
31 | _flash_keep_keys |
32 | _flash_key_hashes |
1dbf4cd5 |
33 | _tried_loading_session_id |
34 | _tried_loading_session_data |
35 | _tried_loading_session_expires |
36 | _tried_loading_flash_data |
4207ce8d |
37 | / |
fff59d60 |
38 | ); |
39 | |
064c3709 |
40 | sub _session_plugin_config { |
41 | my $c = shift; |
42 | # FIXME - Start warning once all the state/store modules have also been updated. |
43 | #$c->log->warn("Deprecated 'session' config key used, please use the key 'Plugin::Session' instead") |
44 | # if exists $c->config->{session} |
45 | #$c->config->{'Plugin::Session'} ||= delete($c->config->{session}) || {}; |
46 | $c->config->{'Plugin::Session'} ||= $c->config->{session} || {}; |
47 | } |
9e447f9d |
48 | |
49 | sub setup { |
9a9252c2 |
50 | my $c = shift; |
51 | |
fe0d5ebe |
52 | $c->maybe::next::method(@_); |
9a9252c2 |
53 | |
54 | $c->check_session_plugin_requirements; |
55 | $c->setup_session; |
56 | |
57 | return $c; |
9e447f9d |
58 | } |
59 | |
60 | sub check_session_plugin_requirements { |
9a9252c2 |
61 | my $c = shift; |
9e447f9d |
62 | |
9a9252c2 |
63 | unless ( $c->isa("Catalyst::Plugin::Session::State") |
64 | && $c->isa("Catalyst::Plugin::Session::Store") ) |
65 | { |
66 | my $err = |
67 | ( "The Session plugin requires both Session::State " |
68 | . "and Session::Store plugins to be used as well." ); |
9e447f9d |
69 | |
9a9252c2 |
70 | $c->log->fatal($err); |
71 | Catalyst::Exception->throw($err); |
72 | } |
9e447f9d |
73 | } |
74 | |
75 | sub setup_session { |
9a9252c2 |
76 | my $c = shift; |
9e447f9d |
77 | |
064c3709 |
78 | my $cfg = $c->_session_plugin_config; |
9e447f9d |
79 | |
9a9252c2 |
80 | %$cfg = ( |
81 | expires => 7200, |
33641c1d |
82 | verify_address => 0, |
06c621b5 |
83 | verify_user_agent => 0, |
f30f78e8 |
84 | expiry_threshold => 0, |
9a9252c2 |
85 | %$cfg, |
86 | ); |
9e447f9d |
87 | |
fe0d5ebe |
88 | $c->maybe::next::method(); |
9e447f9d |
89 | } |
90 | |
19c130c2 |
91 | sub prepare_action { |
92 | my $c = shift; |
93 | |
3e2a53a8 |
94 | $c->maybe::next::method(@_); |
95 | |
064c3709 |
96 | if ( $c->_session_plugin_config->{flash_to_stash} |
e5b2372a |
97 | and $c->sessionid |
4207ce8d |
98 | and my $flash_data = $c->flash ) |
99 | { |
19c130c2 |
100 | @{ $c->stash }{ keys %$flash_data } = values %$flash_data; |
101 | } |
19c130c2 |
102 | } |
103 | |
ccc77553 |
104 | sub finalize_headers { |
9a9252c2 |
105 | my $c = shift; |
9e447f9d |
106 | |
ea548a83 |
107 | # fix cookie before we send headers |
108 | $c->_save_session_expires; |
2a45c03b |
109 | |
f4e8370c |
110 | # Force extension of session_expires before finalizing headers, so a pos |
111 | # up to date. First call to session_expires will extend the expiry, subs |
112 | # just return the previously extended value. |
113 | $c->session_expires; |
114 | |
fe0d5ebe |
115 | return $c->maybe::next::method(@_); |
8f236527 |
116 | } |
117 | |
92eaec32 |
118 | sub finalize_body { |
d3c97126 |
119 | my $c = shift; |
d3c97126 |
120 | |
92eaec32 |
121 | # We have to finalize our session *before* $c->engine->finalize_xxx is called, |
122 | # because we do not want to send the HTTP response before the session is stored/committed to |
123 | # the session database (or whatever Session::Store you use). |
d3c97126 |
124 | $c->finalize_session; |
92eaec32 |
125 | |
fe0d5ebe |
126 | return $c->maybe::next::method(@_); |
d3c97126 |
127 | } |
128 | |
8f236527 |
129 | sub finalize_session { |
130 | my $c = shift; |
131 | |
fe0d5ebe |
132 | $c->maybe::next::method(@_); |
49727697 |
133 | |
9760b704 |
134 | $c->_save_session_id; |
9b0fa2a6 |
135 | $c->_save_session; |
136 | $c->_save_flash; |
137 | |
260b14c4 |
138 | $c->_clear_session_instance_data; |
9b0fa2a6 |
139 | } |
140 | |
b92ce604 |
141 | sub _save_session_id { |
142 | my $c = shift; |
23a2bf16 |
143 | |
144 | # we already called set when allocating |
145 | # no need to tell the state plugins anything new |
b92ce604 |
146 | } |
147 | |
1dbf4cd5 |
148 | sub _save_session_expires { |
9b0fa2a6 |
149 | my $c = shift; |
4207ce8d |
150 | |
260b14c4 |
151 | if ( defined($c->_session_expires) ) { |
260b14c4 |
152 | |
f30f78e8 |
153 | my $threshold = $c->_session_plugin_config->{expiry_threshold} || 0; |
154 | |
155 | if ( my $sid = $c->sessionid ) { |
4bb2f00a |
156 | my $cutoff = $c->_get_stored_session_expires - $threshold; |
f30f78e8 |
157 | |
158 | if (!$threshold || $cutoff <= time) { |
f30f78e8 |
159 | my $expires = $c->session_expires; # force extension |
160 | $c->store_session_data( "expires:$sid" => $expires ); |
161 | |
162 | } |
163 | |
164 | } |
165 | |
1dbf4cd5 |
166 | } |
167 | } |
6687905d |
168 | |
1dbf4cd5 |
169 | sub _save_session { |
170 | my $c = shift; |
7a02371f |
171 | |
1dbf4cd5 |
172 | if ( my $session_data = $c->_session ) { |
d44bc687 |
173 | |
1dbf4cd5 |
174 | no warnings 'uninitialized'; |
175 | if ( Object::Signature::signature($session_data) ne |
176 | $c->_session_data_sig ) |
177 | { |
178 | $session_data->{__updated} = time(); |
179 | my $sid = $c->sessionid; |
180 | $c->store_session_data( "session:$sid" => $session_data ); |
ea972e9a |
181 | } |
9a9252c2 |
182 | } |
9b0fa2a6 |
183 | } |
9a9252c2 |
184 | |
9b0fa2a6 |
185 | sub _save_flash { |
186 | my $c = shift; |
187 | |
1dbf4cd5 |
188 | if ( my $flash_data = $c->_flash ) { |
4207ce8d |
189 | |
1dbf4cd5 |
190 | my $hashes = $c->_flash_key_hashes || {}; |
191 | my $keep = $c->_flash_keep_keys || {}; |
192 | foreach my $key ( keys %$hashes ) { |
193 | if ( !exists $keep->{$key} and Object::Signature::signature( \$flash_data->{$key} ) eq $hashes->{$key} ) { |
194 | delete $flash_data->{$key}; |
23fbca00 |
195 | } |
ea972e9a |
196 | } |
af1e4bc8 |
197 | |
1dbf4cd5 |
198 | my $sid = $c->sessionid; |
199 | |
eb250519 |
200 | my $session_data = $c->_session; |
1dbf4cd5 |
201 | if (%$flash_data) { |
eb250519 |
202 | $session_data->{__flash} = $flash_data; |
1dbf4cd5 |
203 | } |
204 | else { |
eb250519 |
205 | delete $session_data->{__flash}; |
1dbf4cd5 |
206 | } |
eb250519 |
207 | $c->_session($session_data); |
208 | $c->_save_session; |
9b0fa2a6 |
209 | } |
9e447f9d |
210 | } |
211 | |
e5b2372a |
212 | sub _load_session_expires { |
213 | my $c = shift; |
b92ce604 |
214 | return $c->_session_expires if $c->_tried_loading_session_expires; |
1dbf4cd5 |
215 | $c->_tried_loading_session_expires(1); |
e5b2372a |
216 | |
217 | if ( my $sid = $c->sessionid ) { |
4bb2f00a |
218 | my $expires = $c->_get_stored_session_expires; |
e5b2372a |
219 | |
220 | if ( $expires >= time() ) { |
260b14c4 |
221 | $c->_session_expires( $expires ); |
222 | return $expires; |
e5b2372a |
223 | } else { |
224 | $c->delete_session( "session expired" ); |
225 | return 0; |
226 | } |
e5b2372a |
227 | } |
1dbf4cd5 |
228 | |
229 | return; |
e5b2372a |
230 | } |
231 | |
b7acf64e |
232 | sub _load_session { |
233 | my $c = shift; |
b92ce604 |
234 | return $c->_session if $c->_tried_loading_session_data; |
1dbf4cd5 |
235 | $c->_tried_loading_session_data(1); |
b7acf64e |
236 | |
e5b2372a |
237 | if ( my $sid = $c->sessionid ) { |
260b14c4 |
238 | if ( $c->_load_session_expires ) { # > 0 |
0974ac06 |
239 | |
2e412459 |
240 | my $session_data = $c->get_session_data("session:$sid") || return; |
6687905d |
241 | $c->_session($session_data); |
3f182468 |
242 | |
6687905d |
243 | no warnings 'uninitialized'; # ne __address |
064c3709 |
244 | if ( $c->_session_plugin_config->{verify_address} |
2a1463db |
245 | && exists $session_data->{__address} |
6687905d |
246 | && $session_data->{__address} ne $c->request->address ) |
247 | { |
248 | $c->log->warn( |
249 | "Deleting session $sid due to address mismatch (" |
250 | . $session_data->{__address} . " != " |
47ca362e |
251 | . $c->request->address . ")" |
6687905d |
252 | ); |
253 | $c->delete_session("address mismatch"); |
254 | return; |
255 | } |
064c3709 |
256 | if ( $c->_session_plugin_config->{verify_user_agent} |
06c621b5 |
257 | && $session_data->{__user_agent} ne $c->request->user_agent ) |
258 | { |
259 | $c->log->warn( |
260 | "Deleting session $sid due to user agent mismatch (" |
261 | . $session_data->{__user_agent} . " != " |
262 | . $c->request->user_agent . ")" |
263 | ); |
264 | $c->delete_session("user agent mismatch"); |
265 | return; |
266 | } |
4207ce8d |
267 | |
6687905d |
268 | $c->log->debug(qq/Restored session "$sid"/) if $c->debug; |
168d6819 |
269 | $c->_session_data_sig( Object::Signature::signature($session_data) ) if $session_data; |
6687905d |
270 | $c->_expire_session_keys; |
4207ce8d |
271 | |
6687905d |
272 | return $session_data; |
3f182468 |
273 | } |
9a9252c2 |
274 | } |
29d15411 |
275 | |
4207ce8d |
276 | return; |
b7acf64e |
277 | } |
9a9252c2 |
278 | |
9b0fa2a6 |
279 | sub _load_flash { |
280 | my $c = shift; |
b92ce604 |
281 | return $c->_flash if $c->_tried_loading_flash_data; |
1dbf4cd5 |
282 | $c->_tried_loading_flash_data(1); |
9b0fa2a6 |
283 | |
e5b2372a |
284 | if ( my $sid = $c->sessionid ) { |
eb250519 |
285 | |
286 | my $session_data = $c->session; |
287 | $c->_flash($session_data->{__flash}); |
288 | |
289 | if ( my $flash_data = $c->_flash ) |
4207ce8d |
290 | { |
f4d79f85 |
291 | $c->_flash_key_hashes({ map { $_ => Object::Signature::signature( \$flash_data->{$_} ) } keys %$flash_data }); |
af1e4bc8 |
292 | |
9b0fa2a6 |
293 | return $flash_data; |
294 | } |
295 | } |
296 | |
1dbf4cd5 |
297 | return; |
9b0fa2a6 |
298 | } |
299 | |
d44bc687 |
300 | sub _expire_session_keys { |
b7acf64e |
301 | my ( $c, $data ) = @_; |
302 | |
303 | my $now = time; |
304 | |
e5b2372a |
305 | my $expire_times = ( $data || $c->_session || {} )->{__expire_keys} || {}; |
306 | foreach my $key ( grep { $expire_times->{$_} < $now } keys %$expire_times ) { |
b7acf64e |
307 | delete $c->_session->{$key}; |
e5b2372a |
308 | delete $expire_times->{$key}; |
b7acf64e |
309 | } |
9e447f9d |
310 | } |
311 | |
260b14c4 |
312 | sub _clear_session_instance_data { |
313 | my $c = shift; |
314 | $c->$_(undef) for @session_data_accessors; |
fe0d5ebe |
315 | $c->maybe::next::method(@_); # allow other plugins to hook in on this |
260b14c4 |
316 | } |
317 | |
0ade68bd |
318 | sub change_session_id { |
319 | my $c = shift; |
320 | |
321 | my $sessiondata = $c->session; |
322 | my $oldsid = $c->sessionid; |
323 | my $newsid = $c->create_session_id; |
af1e4bc8 |
324 | |
0ade68bd |
325 | if ($oldsid) { |
326 | $c->log->debug(qq/change_sessid: deleting session data from "$oldsid"/) if $c->debug; |
327 | $c->delete_session_data("${_}:${oldsid}") for qw/session expires flash/; |
328 | } |
329 | |
330 | $c->log->debug(qq/change_sessid: storing session data to "$newsid"/) if $c->debug; |
331 | $c->store_session_data( "session:$newsid" => $sessiondata ); |
332 | |
af1e4bc8 |
333 | return $newsid; |
0ade68bd |
334 | } |
335 | |
9e447f9d |
336 | sub delete_session { |
9a9252c2 |
337 | my ( $c, $msg ) = @_; |
9e447f9d |
338 | |
49727697 |
339 | $c->log->debug("Deleting session" . ( defined($msg) ? "($msg)" : '(no reason given)') ) if $c->debug; |
b92ce604 |
340 | |
9a9252c2 |
341 | # delete the session data |
b92ce604 |
342 | if ( my $sid = $c->sessionid ) { |
343 | $c->delete_session_data("${_}:${sid}") for qw/session expires flash/; |
c6eaa93a |
344 | $c->delete_session_id($sid); |
b92ce604 |
345 | } |
e5b2372a |
346 | |
9a9252c2 |
347 | # reset the values in the context object |
ab634fee |
348 | # see the BEGIN block |
260b14c4 |
349 | $c->_clear_session_instance_data; |
6687905d |
350 | |
29d15411 |
351 | $c->_session_delete_reason($msg); |
352 | } |
353 | |
354 | sub session_delete_reason { |
355 | my $c = shift; |
356 | |
e5b2372a |
357 | $c->session_is_valid; # check that it was loaded |
29d15411 |
358 | |
4207ce8d |
359 | $c->_session_delete_reason(@_); |
9e447f9d |
360 | } |
361 | |
6687905d |
362 | sub session_expires { |
e5b2372a |
363 | my $c = shift; |
6687905d |
364 | |
260b14c4 |
365 | if ( defined( my $expires = $c->_extended_session_expires ) ) { |
e5b2372a |
366 | return $expires; |
1dbf4cd5 |
367 | } elsif ( defined( $expires = $c->_load_session_expires ) ) { |
a2e23c04 |
368 | return $c->extend_session_expires( $expires ); |
e5b2372a |
369 | } else { |
1dbf4cd5 |
370 | return 0; |
e5b2372a |
371 | } |
372 | } |
6687905d |
373 | |
e5b2372a |
374 | sub extend_session_expires { |
375 | my ( $c, $expires ) = @_; |
c31fa45f |
376 | $c->_extended_session_expires( my $updated = $c->calculate_initial_session_expires() ); |
4c79feb6 |
377 | $c->extend_session_id( $c->sessionid, $updated ); |
e5b2372a |
378 | return $updated; |
379 | } |
6687905d |
380 | |
601be17a |
381 | sub change_session_expires { |
382 | my ( $c, $expires ) = @_; |
383 | |
384 | $expires ||= 0; |
385 | my $sid = $c->sessionid; |
386 | my $time_exp = time() + $expires; |
387 | $c->store_session_data( "expires:$sid" => $time_exp ); |
388 | } |
389 | |
4bb2f00a |
390 | sub _get_stored_session_expires { |
391 | my ($c) = @_; |
392 | |
393 | if ( my $sid = $c->sessionid ) { |
394 | return $c->get_session_data("expires:$sid") || 0; |
395 | } else { |
396 | return 0; |
397 | } |
398 | } |
399 | |
601be17a |
400 | sub initial_session_expires { |
e5b2372a |
401 | my $c = shift; |
064c3709 |
402 | return ( time() + $c->_session_plugin_config->{expires} ); |
e5b2372a |
403 | } |
404 | |
601be17a |
405 | sub calculate_initial_session_expires { |
4bb2f00a |
406 | my ($c) = @_; |
407 | return max( $c->initial_session_expires, $c->_get_stored_session_expires ); |
601be17a |
408 | } |
409 | |
e5b2372a |
410 | sub calculate_extended_session_expires { |
411 | my ( $c, $prev ) = @_; |
d32c2b5a |
412 | return ( time() + $prev ); |
e5b2372a |
413 | } |
414 | |
415 | sub reset_session_expires { |
416 | my ( $c, $sid ) = @_; |
af1e4bc8 |
417 | |
260b14c4 |
418 | my $exp = $c->calculate_initial_session_expires; |
419 | $c->_session_expires( $exp ); |
cb104024 |
420 | # |
421 | # since we're setting _session_expires directly, make load_session_expires |
422 | # actually use that value. |
423 | # |
424 | $c->_tried_loading_session_expires(1); |
260b14c4 |
425 | $c->_extended_session_expires( $exp ); |
e5b2372a |
426 | $exp; |
6687905d |
427 | } |
428 | |
0974ac06 |
429 | sub sessionid { |
4207ce8d |
430 | my $c = shift; |
af1e4bc8 |
431 | |
1dbf4cd5 |
432 | return $c->_sessionid || $c->_load_sessionid; |
433 | } |
434 | |
435 | sub _load_sessionid { |
436 | my $c = shift; |
437 | return if $c->_tried_loading_session_id; |
438 | $c->_tried_loading_session_id(1); |
439 | |
440 | if ( defined( my $sid = $c->get_session_id ) ) { |
441 | if ( $c->validate_session_id($sid) ) { |
ec299c02 |
442 | # temporarily set the inner key, so that validation will work |
443 | $c->_sessionid($sid); |
1dbf4cd5 |
444 | return $sid; |
445 | } else { |
446 | my $err = "Tried to set invalid session ID '$sid'"; |
447 | $c->log->error($err); |
448 | Catalyst::Exception->throw($err); |
4207ce8d |
449 | } |
450 | } |
1dbf4cd5 |
451 | |
452 | return; |
e5b2372a |
453 | } |
454 | |
455 | sub session_is_valid { |
456 | my $c = shift; |
4207ce8d |
457 | |
b92ce604 |
458 | # force a check for expiry, but also __address, etc |
459 | if ( $c->_load_session ) { |
e5b2372a |
460 | return 1; |
461 | } else { |
462 | return; |
463 | } |
0974ac06 |
464 | } |
465 | |
466 | sub validate_session_id { |
4207ce8d |
467 | my ( $c, $sid ) = @_; |
0974ac06 |
468 | |
4207ce8d |
469 | $sid and $sid =~ /^[a-f\d]+$/i; |
0974ac06 |
470 | } |
471 | |
9e447f9d |
472 | sub session { |
9a9252c2 |
473 | my $c = shift; |
9e447f9d |
474 | |
a491a59b |
475 | my $session = $c->_session || $c->_load_session || do { |
1dbf4cd5 |
476 | $c->create_session_id_if_needed; |
29d15411 |
477 | $c->initialize_session_data; |
4207ce8d |
478 | }; |
a491a59b |
479 | |
480 | if (@_) { |
481 | my $new_values = @_ > 1 ? { @_ } : $_[0]; |
482 | croak('session takes a hash or hashref') unless ref $new_values; |
483 | |
484 | for my $key (keys %$new_values) { |
485 | $session->{$key} = $new_values->{$key}; |
486 | } |
487 | } |
488 | |
489 | $session; |
9e447f9d |
490 | } |
491 | |
f4d79f85 |
492 | sub keep_flash { |
493 | my ( $c, @keys ) = @_; |
2e412459 |
494 | my $href = $c->_flash_keep_keys || $c->_flash_keep_keys({}); |
495 | (@{$href}{@keys}) = ((undef) x @keys); |
f4d79f85 |
496 | } |
497 | |
af1e4bc8 |
498 | sub _flash_data { |
873f7011 |
499 | my $c = shift; |
78476ce0 |
500 | $c->_flash || $c->_load_flash || do { |
1dbf4cd5 |
501 | $c->create_session_id_if_needed; |
78476ce0 |
502 | $c->_flash( {} ); |
c9396824 |
503 | }; |
504 | } |
505 | |
506 | sub _set_flash { |
507 | my $c = shift; |
508 | if (@_) { |
509 | my $items = @_ > 1 ? {@_} : $_[0]; |
510 | croak('flash takes a hash or hashref') unless ref $items; |
511 | @{ $c->_flash }{ keys %$items } = values %$items; |
1dbf4cd5 |
512 | } |
873f7011 |
513 | } |
514 | |
c9396824 |
515 | sub flash { |
516 | my $c = shift; |
517 | $c->_flash_data; |
f6009cac |
518 | $c->_set_flash(@_); |
519 | return $c->_flash; |
c9396824 |
520 | } |
521 | |
49727697 |
522 | sub clear_flash { |
523 | my $c = shift; |
af1e4bc8 |
524 | |
5a1f6ed4 |
525 | #$c->delete_session_data("flash:" . $c->sessionid); # should this be in here? or delayed till finalization? |
49727697 |
526 | $c->_flash_key_hashes({}); |
5a1f6ed4 |
527 | $c->_flash_keep_keys({}); |
49727697 |
528 | $c->_flash({}); |
529 | } |
530 | |
b7acf64e |
531 | sub session_expire_key { |
532 | my ( $c, %keys ) = @_; |
533 | |
534 | my $now = time; |
4207ce8d |
535 | @{ $c->session->{__expire_keys} }{ keys %keys } = |
536 | map { $now + $_ } values %keys; |
b7acf64e |
537 | } |
538 | |
9e447f9d |
539 | sub initialize_session_data { |
9a9252c2 |
540 | my $c = shift; |
9e447f9d |
541 | |
9a9252c2 |
542 | my $now = time; |
9e447f9d |
543 | |
3b667f72 |
544 | return $c->_session( |
545 | { |
4207ce8d |
546 | __created => $now, |
547 | __updated => $now, |
548 | |
549 | ( |
064c3709 |
550 | $c->_session_plugin_config->{verify_address} |
f8f81744 |
551 | ? ( __address => $c->request->address||'' ) |
4207ce8d |
552 | : () |
553 | ), |
06c621b5 |
554 | ( |
064c3709 |
555 | $c->_session_plugin_config->{verify_user_agent} |
f8f81744 |
556 | ? ( __user_agent => $c->request->user_agent||'' ) |
06c621b5 |
557 | : () |
558 | ), |
3b667f72 |
559 | } |
560 | ); |
9e447f9d |
561 | } |
562 | |
9e447f9d |
563 | sub generate_session_id { |
564 | my $c = shift; |
565 | |
566 | my $digest = $c->_find_digest(); |
567 | $digest->add( $c->session_hash_seed() ); |
568 | return $digest->hexdigest; |
569 | } |
570 | |
1dbf4cd5 |
571 | sub create_session_id_if_needed { |
78476ce0 |
572 | my $c = shift; |
1dbf4cd5 |
573 | $c->create_session_id unless $c->sessionid; |
574 | } |
78476ce0 |
575 | |
1dbf4cd5 |
576 | sub create_session_id { |
577 | my $c = shift; |
af1e4bc8 |
578 | |
e5b2372a |
579 | my $sid = $c->generate_session_id; |
78476ce0 |
580 | |
e5b2372a |
581 | $c->log->debug(qq/Created session "$sid"/) if $c->debug; |
78476ce0 |
582 | |
e5b2372a |
583 | $c->_sessionid($sid); |
584 | $c->reset_session_expires; |
585 | $c->set_session_id($sid); |
586 | |
587 | return $sid; |
78476ce0 |
588 | } |
589 | |
9e447f9d |
590 | my $counter; |
9a9252c2 |
591 | |
9e447f9d |
592 | sub session_hash_seed { |
9a9252c2 |
593 | my $c = shift; |
594 | |
595 | return join( "", ++$counter, time, rand, $$, {}, overload::StrVal($c), ); |
9e447f9d |
596 | } |
597 | |
598 | my $usable; |
9a9252c2 |
599 | |
9e447f9d |
600 | sub _find_digest () { |
9a9252c2 |
601 | unless ($usable) { |
d44bc687 |
602 | foreach my $alg (qw/SHA-1 SHA-256 MD5/) { |
4207ce8d |
603 | if ( eval { Digest->new($alg) } ) { |
5faaa4b0 |
604 | $usable = $alg; |
605 | last; |
606 | } |
7d139eeb |
607 | } |
4207ce8d |
608 | Catalyst::Exception->throw( |
9a9252c2 |
609 | "Could not find a suitable Digest module. Please install " |
4207ce8d |
610 | . "Digest::SHA1, Digest::SHA, or Digest::MD5" ) |
611 | unless $usable; |
9a9252c2 |
612 | } |
9e447f9d |
613 | |
614 | return Digest->new($usable); |
615 | } |
616 | |
99b2191e |
617 | sub dump_these { |
618 | my $c = shift; |
619 | |
620 | ( |
fe0d5ebe |
621 | $c->maybe::next::method(), |
99b2191e |
622 | |
834ab0b8 |
623 | $c->_sessionid |
99b2191e |
624 | ? ( [ "Session ID" => $c->sessionid ], [ Session => $c->session ], ) |
625 | : () |
626 | ); |
627 | } |
628 | |
e5b2372a |
629 | |
fe0d5ebe |
630 | sub get_session_id { shift->maybe::next::method(@_) } |
631 | sub set_session_id { shift->maybe::next::method(@_) } |
632 | sub delete_session_id { shift->maybe::next::method(@_) } |
633 | sub extend_session_id { shift->maybe::next::method(@_) } |
e5b2372a |
634 | |
9e447f9d |
635 | __PACKAGE__; |
636 | |
637 | __END__ |
638 | |
639 | =pod |
640 | |
641 | =head1 NAME |
642 | |
7048c24e |
643 | Catalyst::Plugin::Session - Generic Session plugin - ties together server side storage and client side state required to maintain session data. |
9e447f9d |
644 | |
645 | =head1 SYNOPSIS |
646 | |
8f0b4c16 |
647 | # To get sessions to "just work", all you need to do is use these plugins: |
648 | |
649 | use Catalyst qw/ |
650 | Session |
651 | Session::Store::FastMmap |
652 | Session::State::Cookie |
653 | /; |
654 | |
7048c24e |
655 | # you can replace Store::FastMmap with Store::File - both have sensible |
656 | # default configurations (see their docs for details) |
8f0b4c16 |
657 | |
7048c24e |
658 | # more complicated backends are available for other scenarios (DBI storage, |
659 | # etc) |
8f0b4c16 |
660 | |
661 | |
662 | # after you've loaded the plugins you can save session data |
663 | # For example, if you are writing a shopping cart, it could be implemented |
664 | # like this: |
9e447f9d |
665 | |
229a5b53 |
666 | sub add_item : Local { |
667 | my ( $self, $c ) = @_; |
668 | |
669 | my $item_id = $c->req->param("item"); |
670 | |
8f0b4c16 |
671 | # $c->session is a hash ref, a bit like $c->stash |
672 | # the difference is that it' preserved across requests |
229a5b53 |
673 | |
674 | push @{ $c->session->{items} }, $item_id; |
675 | |
676 | $c->forward("MyView"); |
677 | } |
678 | |
679 | sub display_items : Local { |
680 | my ( $self, $c ) = @_; |
681 | |
682 | # values in $c->session are restored |
683 | $c->stash->{items_to_display} = |
8f0b4c16 |
684 | [ map { MyModel->retrieve($_) } @{ $c->session->{items} } ]; |
229a5b53 |
685 | |
686 | $c->forward("MyView"); |
687 | } |
688 | |
9e447f9d |
689 | =head1 DESCRIPTION |
690 | |
691 | The Session plugin is the base of two related parts of functionality required |
692 | for session management in web applications. |
693 | |
694 | The first part, the State, is getting the browser to repeat back a session key, |
695 | so that the web application can identify the client and logically string |
696 | several requests together into a session. |
697 | |
698 | The second part, the Store, deals with the actual storage of information about |
699 | the client. This data is stored so that the it may be revived for every request |
700 | made by the same client. |
701 | |
702 | This plugin links the two pieces together. |
703 | |
2a323f6f |
704 | =head1 RECOMENDED BACKENDS |
8f0b4c16 |
705 | |
706 | =over 4 |
707 | |
708 | =item Session::State::Cookie |
709 | |
710 | The only really sane way to do state is using cookies. |
711 | |
712 | =item Session::Store::File |
713 | |
714 | A portable backend, based on Cache::File. |
715 | |
716 | =item Session::Store::FastMmap |
717 | |
718 | A fast and flexible backend, based on Cache::FastMmap. |
719 | |
720 | =back |
721 | |
9e447f9d |
722 | =head1 METHODS |
723 | |
724 | =over 4 |
725 | |
726 | =item sessionid |
727 | |
728 | An accessor for the session ID value. |
729 | |
730 | =item session |
731 | |
732 | Returns a hash reference that might contain unserialized values from previous |
733 | requests in the same session, and whose modified value will be saved for future |
734 | requests. |
735 | |
736 | This method will automatically create a new session and session ID if none |
737 | exists. |
738 | |
a491a59b |
739 | You can also set session keys by passing a list of key/value pairs or a |
740 | hashref. |
741 | |
742 | $c->session->{foo} = "bar"; # This works. |
743 | $c->session(one => 1, two => 2); # And this. |
744 | $c->session({ answer => 42 }); # And this. |
745 | |
ab634fee |
746 | =item session_expires |
747 | |
ab634fee |
748 | This method returns the time when the current session will expire, or 0 if |
749 | there is no current session. If there is a session and it already expired, it |
750 | will delete the session and return 0 as well. |
751 | |
07e714d2 |
752 | =item flash |
753 | |
754 | This is like Ruby on Rails' flash data structure. Think of it as a stash that |
44ab6d1c |
755 | lasts for longer than one request, letting you redirect instead of forward. |
756 | |
757 | The flash data will be cleaned up only on requests on which actually use |
758 | $c->flash (thus allowing multiple redirections), and the policy is to delete |
bf6bd311 |
759 | all the keys which haven't changed since the flash data was loaded at the end |
760 | of every request. |
07e714d2 |
761 | |
ad3142b4 |
762 | Note that use of the flash is an easy way to get data across requests, but |
763 | it's also strongly disrecommended, due it it being inherently plagued with |
764 | race conditions. This means that it's unlikely to work well if your |
765 | users have multiple tabs open at once, or if your site does a lot of AJAX |
766 | requests. |
767 | |
768 | L<Catalyst::Plugin::StatusMessage> is the recommended alternative solution, |
769 | as this doesn't suffer from these issues. |
770 | |
07e714d2 |
771 | sub moose : Local { |
772 | my ( $self, $c ) = @_; |
773 | |
774 | $c->flash->{beans} = 10; |
775 | $c->response->redirect( $c->uri_for("foo") ); |
776 | } |
777 | |
778 | sub foo : Local { |
779 | my ( $self, $c ) = @_; |
780 | |
781 | my $value = $c->flash->{beans}; |
782 | |
783 | # ... |
784 | |
785 | $c->response->redirect( $c->uri_for("bar") ); |
786 | } |
787 | |
788 | sub bar : Local { |
789 | my ( $self, $c ) = @_; |
790 | |
791 | if ( exists $c->flash->{beans} ) { # false |
af1e4bc8 |
792 | |
07e714d2 |
793 | } |
794 | } |
795 | |
49727697 |
796 | =item clear_flash |
797 | |
798 | Zap all the keys in the flash regardless of their current state. |
799 | |
bf6bd311 |
800 | =item keep_flash @keys |
801 | |
1961343c |
802 | If you want to keep a flash key for the next request too, even if it hasn't |
bf6bd311 |
803 | changed, call C<keep_flash> and pass in the keys as arguments. |
804 | |
fffeb18f |
805 | =item delete_session REASON |
806 | |
807 | This method is used to invalidate a session. It takes an optional parameter |
808 | which will be saved in C<session_delete_reason> if provided. |
809 | |
eb250519 |
810 | NOTE: This method will B<also> delete your flash data. |
811 | |
9e447f9d |
812 | =item session_delete_reason |
813 | |
814 | This accessor contains a string with the reason a session was deleted. Possible |
815 | values include: |
816 | |
817 | =over 4 |
818 | |
819 | =item * |
820 | |
821 | C<address mismatch> |
822 | |
823 | =item * |
824 | |
825 | C<session expired> |
826 | |
827 | =back |
828 | |
b7acf64e |
829 | =item session_expire_key $key, $ttl |
830 | |
831 | Mark a key to expire at a certain time (only useful when shorter than the |
832 | expiry time for the whole session). |
833 | |
834 | For example: |
835 | |
32f97098 |
836 | __PACKAGE__->config('Plugin::Session' => { expires => 10000000000 }); # "forever" |
2110d078 |
837 | (NB If this number is too large, Y2K38 breakage could result.) |
b7acf64e |
838 | |
839 | # later |
840 | |
841 | $c->session_expire_key( __user => 3600 ); |
842 | |
843 | Will make the session data survive, but the user will still be logged out after |
844 | an hour. |
845 | |
846 | Note that these values are not auto extended. |
847 | |
0ade68bd |
848 | =item change_session_id |
849 | |
850 | By calling this method you can force a session id change while keeping all |
851 | session data. This method might come handy when you are paranoid about some |
852 | advanced variations of session fixation attack. |
853 | |
854 | If you want to prevent this session fixation scenario: |
855 | |
856 | 0) let us have WebApp with anonymous and authenticated parts |
af1e4bc8 |
857 | 1) a hacker goes to vulnerable WebApp and gets a real sessionid, |
0ade68bd |
858 | just by browsing anonymous part of WebApp |
859 | 2) the hacker inserts (somehow) this values into a cookie in victim's browser |
860 | 3) after the victim logs into WebApp the hacker can enter his/her session |
861 | |
862 | you should call change_session_id in your login controller like this: |
863 | |
864 | if ($c->authenticate( { username => $user, password => $pass } )) { |
865 | # login OK |
866 | $c->change_session_id; |
867 | ... |
868 | } else { |
869 | # login FAILED |
870 | ... |
871 | } |
872 | |
601be17a |
873 | =item change_session_expires $expires |
874 | |
875 | You can change the session expiration time for this session; |
876 | |
877 | $c->change_session_expires( 4000 ); |
878 | |
fa022110 |
879 | Note that this only works to set the session longer than the config setting. |
880 | |
8f0b4c16 |
881 | =back |
882 | |
10c72079 |
883 | =head1 INTERNAL METHODS |
8f0b4c16 |
884 | |
885 | =over 4 |
886 | |
9e447f9d |
887 | =item setup |
888 | |
889 | This method is extended to also make calls to |
890 | C<check_session_plugin_requirements> and C<setup_session>. |
891 | |
892 | =item check_session_plugin_requirements |
893 | |
894 | This method ensures that a State and a Store plugin are also in use by the |
895 | application. |
896 | |
897 | =item setup_session |
898 | |
064c3709 |
899 | This method populates C<< $c->config('Plugin::Session') >> with the default values |
9e447f9d |
900 | listed in L</CONFIGURATION>. |
901 | |
902 | =item prepare_action |
903 | |
bfa4f9cc |
904 | This method is extended. |
68fd02ae |
905 | |
bfa4f9cc |
906 | Its only effect is if the (off by default) C<flash_to_stash> configuration |
68fd02ae |
907 | parameter is on - then it will copy the contents of the flash to the stash at |
908 | prepare time. |
9e447f9d |
909 | |
ccc77553 |
910 | =item finalize_headers |
9e447f9d |
911 | |
d3c97126 |
912 | This method is extended and will extend the expiry time before sending |
913 | the response. |
914 | |
92eaec32 |
915 | =item finalize_body |
d3c97126 |
916 | |
92eaec32 |
917 | This method is extended and will call finalize_session before the other |
918 | finalize_body methods run. Here we persist the session data if a session exists. |
9e447f9d |
919 | |
9e447f9d |
920 | =item initialize_session_data |
921 | |
922 | This method will initialize the internal structure of the session, and is |
923 | called by the C<session> method if appropriate. |
924 | |
68fd02ae |
925 | =item create_session_id |
926 | |
bfa4f9cc |
927 | Creates a new session ID using C<generate_session_id> if there is no session ID |
68fd02ae |
928 | yet. |
929 | |
ab634fee |
930 | =item validate_session_id SID |
931 | |
932 | Make sure a session ID is of the right format. |
933 | |
934 | This currently ensures that the session ID string is any amount of case |
935 | insensitive hexadecimal characters. |
936 | |
229a5b53 |
937 | =item generate_session_id |
938 | |
939 | This method will return a string that can be used as a session ID. It is |
940 | supposed to be a reasonably random string with enough bits to prevent |
941 | collision. It basically takes C<session_hash_seed> and hashes it using SHA-1, |
bfa4f9cc |
942 | MD5 or SHA-256, depending on the availability of these modules. |
229a5b53 |
943 | |
944 | =item session_hash_seed |
945 | |
946 | This method is actually rather internal to generate_session_id, but should be |
947 | overridable in case you want to provide more random data. |
948 | |
949 | Currently it returns a concatenated string which contains: |
950 | |
951 | =over 4 |
952 | |
7048c24e |
953 | =item * A counter |
229a5b53 |
954 | |
7048c24e |
955 | =item * The current time |
229a5b53 |
956 | |
7048c24e |
957 | =item * One value from C<rand>. |
229a5b53 |
958 | |
7048c24e |
959 | =item * The stringified value of a newly allocated hash reference |
229a5b53 |
960 | |
7048c24e |
961 | =item * The stringified value of the Catalyst context object |
229a5b53 |
962 | |
963 | =back |
964 | |
bfa4f9cc |
965 | in the hopes that those combined values are entropic enough for most uses. If |
229a5b53 |
966 | this is not the case you can replace C<session_hash_seed> with e.g. |
967 | |
968 | sub session_hash_seed { |
969 | open my $fh, "<", "/dev/random"; |
970 | read $fh, my $bytes, 20; |
971 | close $fh; |
972 | return $bytes; |
973 | } |
974 | |
975 | Or even more directly, replace C<generate_session_id>: |
976 | |
977 | sub generate_session_id { |
978 | open my $fh, "<", "/dev/random"; |
979 | read $fh, my $bytes, 20; |
980 | close $fh; |
981 | return unpack("H*", $bytes); |
982 | } |
983 | |
984 | Also have a look at L<Crypt::Random> and the various openssl bindings - these |
985 | modules provide APIs for cryptographically secure random data. |
986 | |
8f236527 |
987 | =item finalize_session |
988 | |
989 | Clean up the session during C<finalize>. |
990 | |
991 | This clears the various accessors after saving to the store. |
992 | |
99b2191e |
993 | =item dump_these |
994 | |
995 | See L<Catalyst/dump_these> - ammends the session data structure to the list of |
996 | dumped objects if session ID is defined. |
997 | |
d3c97126 |
998 | |
999 | =item calculate_extended_session_expires |
1000 | |
1001 | =item calculate_initial_session_expires |
1002 | |
1003 | =item create_session_id_if_needed |
1004 | |
1005 | =item delete_session_id |
1006 | |
1007 | =item extend_session_expires |
1008 | |
601be17a |
1009 | Note: this is *not* used to give an individual user a longer session. See |
1010 | 'change_session_expires'. |
1011 | |
d3c97126 |
1012 | =item extend_session_id |
1013 | |
1014 | =item get_session_id |
1015 | |
1016 | =item reset_session_expires |
1017 | |
1018 | =item session_is_valid |
1019 | |
1020 | =item set_session_id |
1021 | |
f394eae3 |
1022 | =item initial_session_expires |
1023 | |
9e447f9d |
1024 | =back |
1025 | |
a92c8aeb |
1026 | =head1 USING SESSIONS DURING PREPARE |
1027 | |
1028 | The earliest point in time at which you may use the session data is after |
1029 | L<Catalyst::Plugin::Session>'s C<prepare_action> has finished. |
1030 | |
1031 | State plugins must set $c->session ID before C<prepare_action>, and during |
1032 | C<prepare_action> L<Catalyst::Plugin::Session> will actually load the data from |
1033 | the store. |
1034 | |
7048c24e |
1035 | sub prepare_action { |
1036 | my $c = shift; |
a92c8aeb |
1037 | |
7048c24e |
1038 | # don't touch $c->session yet! |
b1cd7d77 |
1039 | |
7048c24e |
1040 | $c->NEXT::prepare_action( @_ ); |
a92c8aeb |
1041 | |
7048c24e |
1042 | $c->session; # this is OK |
1043 | $c->sessionid; # this is also OK |
1044 | } |
a92c8aeb |
1045 | |
9e447f9d |
1046 | =head1 CONFIGURATION |
1047 | |
064c3709 |
1048 | $c->config('Plugin::Session' => { |
229a5b53 |
1049 | expires => 1234, |
064c3709 |
1050 | }); |
9e447f9d |
1051 | |
1052 | All configuation parameters are provided in a hash reference under the |
064c3709 |
1053 | C<Plugin::Session> key in the configuration hash. |
9e447f9d |
1054 | |
1055 | =over 4 |
1056 | |
1057 | =item expires |
1058 | |
1059 | The time-to-live of each session, expressed in seconds. Defaults to 7200 (two |
1060 | hours). |
1061 | |
f30f78e8 |
1062 | =item expiry_threshold |
1063 | |
1064 | The time (in seconds) before the session expiration to update the |
1065 | expiration time (and thus the session). |
1066 | |
1067 | The purpose of this is to keep the session store from being updated |
1068 | when nothing else in the session is updated. |
1069 | |
1070 | Defaults to 0 (in which case, the expiration will always be updated). |
1071 | |
9e447f9d |
1072 | =item verify_address |
1073 | |
dd7f0872 |
1074 | When true, C<< $c->request->address >> will be checked at prepare time. If it is |
8c7e922c |
1075 | not the same as the address that initiated the session, the session is deleted. |
9e447f9d |
1076 | |
33641c1d |
1077 | Defaults to false. |
1078 | |
06c621b5 |
1079 | =item verify_user_agent |
1080 | |
dd7f0872 |
1081 | When true, C<< $c->request->user_agent >> will be checked at prepare time. If it |
af1e4bc8 |
1082 | is not the same as the user agent that initiated the session, the session is |
06c621b5 |
1083 | deleted. |
1084 | |
1085 | Defaults to false. |
1086 | |
68fd02ae |
1087 | =item flash_to_stash |
1088 | |
1089 | This option makes it easier to have actions behave the same whether they were |
1090 | forwarded to or redirected to. On prepare time it copies the contents of |
1091 | C<flash> (if any) to the stash. |
1092 | |
9e447f9d |
1093 | =back |
1094 | |
1095 | =head1 SPECIAL KEYS |
1096 | |
1097 | The hash reference returned by C<< $c->session >> contains several keys which |
1098 | are automatically set: |
1099 | |
1100 | =over 4 |
1101 | |
1102 | =item __expires |
1103 | |
ab634fee |
1104 | This key no longer exists. Use C<session_expires> instead. |
9e447f9d |
1105 | |
1106 | =item __updated |
1107 | |
d44bc687 |
1108 | The last time a session was saved to the store. |
9e447f9d |
1109 | |
1110 | =item __created |
1111 | |
1112 | The time when the session was first created. |
1113 | |
1114 | =item __address |
1115 | |
1116 | The value of C<< $c->request->address >> at the time the session was created. |
8c7e922c |
1117 | This value is only populated if C<verify_address> is true in the configuration. |
9e447f9d |
1118 | |
06c621b5 |
1119 | =item __user_agent |
1120 | |
e79a686c |
1121 | The value of C<< $c->request->user_agent >> at the time the session was created. |
06c621b5 |
1122 | This value is only populated if C<verify_user_agent> is true in the configuration. |
1123 | |
9e447f9d |
1124 | =back |
1125 | |
c80e9f04 |
1126 | =head1 CAVEATS |
1127 | |
a552e4b5 |
1128 | =head2 Round the Robin Proxies |
1129 | |
c80e9f04 |
1130 | C<verify_address> could make your site inaccessible to users who are behind |
1131 | load balanced proxies. Some ISPs may give a different IP to each request by the |
1132 | same client due to this type of proxying. If addresses are verified these |
1133 | users' sessions cannot persist. |
1134 | |
1135 | To let these users access your site you can either disable address verification |
1136 | as a whole, or provide a checkbox in the login dialog that tells the server |
1137 | that it's OK for the address of the client to change. When the server sees that |
bfa4f9cc |
1138 | this box is checked it should delete the C<__address> special key from the |
c80e9f04 |
1139 | session hash when the hash is first created. |
1140 | |
a552e4b5 |
1141 | =head2 Race Conditions |
1142 | |
bfa4f9cc |
1143 | In this day and age where cleaning detergents and Dutch football (not the |
1144 | American kind) teams roam the plains in great numbers, requests may happen |
a552e4b5 |
1145 | simultaneously. This means that there is some risk of session data being |
1146 | overwritten, like this: |
1147 | |
1148 | =over 4 |
1149 | |
1150 | =item 1. |
1151 | |
bfa4f9cc |
1152 | request a starts, request b starts, with the same session ID |
a552e4b5 |
1153 | |
1154 | =item 2. |
1155 | |
1156 | session data is loaded in request a |
1157 | |
1158 | =item 3. |
1159 | |
1160 | session data is loaded in request b |
1161 | |
1162 | =item 4. |
1163 | |
1164 | session data is changed in request a |
1165 | |
1166 | =item 5. |
1167 | |
1168 | request a finishes, session data is updated and written to store |
1169 | |
1170 | =item 6. |
1171 | |
1172 | request b finishes, session data is updated and written to store, overwriting |
1173 | changes by request a |
1174 | |
1175 | =back |
1176 | |
b6dae3d3 |
1177 | For applications where any given user's session is only making one request |
1178 | at a time this plugin should be safe enough. |
a552e4b5 |
1179 | |
d45028d6 |
1180 | =head1 AUTHORS |
1181 | |
7048c24e |
1182 | Andy Grundman |
baa9db9c |
1183 | |
7048c24e |
1184 | Christian Hansen |
baa9db9c |
1185 | |
2842d938 |
1186 | Yuval Kogman, C<nothingmuch@woobling.org> |
baa9db9c |
1187 | |
7048c24e |
1188 | Sebastian Riedel |
baa9db9c |
1189 | |
2842d938 |
1190 | Tomas Doran (t0m) C<bobtfish@bobtfish.net> (current maintainer) |
1191 | |
1192 | Sergio Salvi |
1193 | |
af1e4bc8 |
1194 | kmx C<kmx@volny.cz> |
1195 | |
836b0a11 |
1196 | Florian Ragwitz (rafl) C<rafl@debian.org> |
1197 | |
1198 | Kent Fredric (kentnl) |
1199 | |
baa9db9c |
1200 | And countless other contributers from #catalyst. Thanks guys! |
d45028d6 |
1201 | |
1cc09185 |
1202 | =head1 Contributors |
1203 | |
1204 | Devin Austin (dhoss) <dhoss@cpan.org> |
1205 | |
cc40ae4b |
1206 | =head1 COPYRIGHT & LICENSE |
d45028d6 |
1207 | |
7048c24e |
1208 | Copyright (c) 2005 the aforementioned authors. All rights |
1209 | reserved. This program is free software; you can redistribute |
1210 | it and/or modify it under the same terms as Perl itself. |
d45028d6 |
1211 | |
9e447f9d |
1212 | =cut |
1213 | |
1214 | |