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; |
9e447f9d |
13 | |
c0c50a2c |
14 | use namespace::clean -except => 'meta'; |
15 | |
e79a686c |
16 | our $VERSION = '0.23'; |
37160715 |
17 | |
ab634fee |
18 | my @session_data_accessors; # used in delete_session |
fff59d60 |
19 | |
20 | __PACKAGE__->mk_accessors( |
ab634fee |
21 | "_session_delete_reason", |
22 | @session_data_accessors = qw/ |
4207ce8d |
23 | _sessionid |
24 | _session |
25 | _session_expires |
260b14c4 |
26 | _extended_session_expires |
4207ce8d |
27 | _session_data_sig |
4207ce8d |
28 | _flash |
f4d79f85 |
29 | _flash_keep_keys |
30 | _flash_key_hashes |
1dbf4cd5 |
31 | _tried_loading_session_id |
32 | _tried_loading_session_data |
33 | _tried_loading_session_expires |
34 | _tried_loading_flash_data |
4207ce8d |
35 | / |
fff59d60 |
36 | ); |
37 | |
9e447f9d |
38 | |
39 | sub setup { |
9a9252c2 |
40 | my $c = shift; |
41 | |
fe0d5ebe |
42 | $c->maybe::next::method(@_); |
9a9252c2 |
43 | |
44 | $c->check_session_plugin_requirements; |
45 | $c->setup_session; |
46 | |
47 | return $c; |
9e447f9d |
48 | } |
49 | |
50 | sub check_session_plugin_requirements { |
9a9252c2 |
51 | my $c = shift; |
9e447f9d |
52 | |
9a9252c2 |
53 | unless ( $c->isa("Catalyst::Plugin::Session::State") |
54 | && $c->isa("Catalyst::Plugin::Session::Store") ) |
55 | { |
56 | my $err = |
57 | ( "The Session plugin requires both Session::State " |
58 | . "and Session::Store plugins to be used as well." ); |
9e447f9d |
59 | |
9a9252c2 |
60 | $c->log->fatal($err); |
61 | Catalyst::Exception->throw($err); |
62 | } |
9e447f9d |
63 | } |
64 | |
65 | sub setup_session { |
9a9252c2 |
66 | my $c = shift; |
9e447f9d |
67 | |
9a9252c2 |
68 | my $cfg = ( $c->config->{session} ||= {} ); |
9e447f9d |
69 | |
9a9252c2 |
70 | %$cfg = ( |
71 | expires => 7200, |
33641c1d |
72 | verify_address => 0, |
06c621b5 |
73 | verify_user_agent => 0, |
9a9252c2 |
74 | %$cfg, |
75 | ); |
9e447f9d |
76 | |
fe0d5ebe |
77 | $c->maybe::next::method(); |
9e447f9d |
78 | } |
79 | |
19c130c2 |
80 | sub prepare_action { |
81 | my $c = shift; |
82 | |
4207ce8d |
83 | if ( $c->config->{session}{flash_to_stash} |
e5b2372a |
84 | and $c->sessionid |
4207ce8d |
85 | and my $flash_data = $c->flash ) |
86 | { |
19c130c2 |
87 | @{ $c->stash }{ keys %$flash_data } = values %$flash_data; |
88 | } |
89 | |
fe0d5ebe |
90 | $c->maybe::next::method(@_); |
19c130c2 |
91 | } |
92 | |
ccc77553 |
93 | sub finalize_headers { |
9a9252c2 |
94 | my $c = shift; |
9e447f9d |
95 | |
d3c97126 |
96 | # fix cookie before we send headers |
97 | $c->_save_session_expires; |
2a45c03b |
98 | |
fe0d5ebe |
99 | return $c->maybe::next::method(@_); |
8f236527 |
100 | } |
101 | |
92eaec32 |
102 | sub finalize_body { |
d3c97126 |
103 | my $c = shift; |
d3c97126 |
104 | |
92eaec32 |
105 | # We have to finalize our session *before* $c->engine->finalize_xxx is called, |
106 | # because we do not want to send the HTTP response before the session is stored/committed to |
107 | # the session database (or whatever Session::Store you use). |
d3c97126 |
108 | $c->finalize_session; |
92eaec32 |
109 | |
fe0d5ebe |
110 | return $c->maybe::next::method(@_); |
d3c97126 |
111 | } |
112 | |
8f236527 |
113 | sub finalize_session { |
114 | my $c = shift; |
115 | |
fe0d5ebe |
116 | $c->maybe::next::method(@_); |
49727697 |
117 | |
9760b704 |
118 | $c->_save_session_id; |
9b0fa2a6 |
119 | $c->_save_session; |
120 | $c->_save_flash; |
121 | |
260b14c4 |
122 | $c->_clear_session_instance_data; |
9b0fa2a6 |
123 | } |
124 | |
b92ce604 |
125 | sub _save_session_id { |
126 | my $c = shift; |
23a2bf16 |
127 | |
128 | # we already called set when allocating |
129 | # no need to tell the state plugins anything new |
b92ce604 |
130 | } |
131 | |
1dbf4cd5 |
132 | sub _save_session_expires { |
9b0fa2a6 |
133 | my $c = shift; |
4207ce8d |
134 | |
260b14c4 |
135 | if ( defined($c->_session_expires) ) { |
136 | my $expires = $c->session_expires; # force extension |
137 | |
1dbf4cd5 |
138 | my $sid = $c->sessionid; |
139 | $c->store_session_data( "expires:$sid" => $expires ); |
1dbf4cd5 |
140 | } |
141 | } |
6687905d |
142 | |
1dbf4cd5 |
143 | sub _save_session { |
144 | my $c = shift; |
7a02371f |
145 | |
1dbf4cd5 |
146 | if ( my $session_data = $c->_session ) { |
d44bc687 |
147 | |
1dbf4cd5 |
148 | no warnings 'uninitialized'; |
149 | if ( Object::Signature::signature($session_data) ne |
150 | $c->_session_data_sig ) |
151 | { |
152 | $session_data->{__updated} = time(); |
153 | my $sid = $c->sessionid; |
154 | $c->store_session_data( "session:$sid" => $session_data ); |
ea972e9a |
155 | } |
9a9252c2 |
156 | } |
9b0fa2a6 |
157 | } |
9a9252c2 |
158 | |
9b0fa2a6 |
159 | sub _save_flash { |
160 | my $c = shift; |
161 | |
1dbf4cd5 |
162 | if ( my $flash_data = $c->_flash ) { |
4207ce8d |
163 | |
1dbf4cd5 |
164 | my $hashes = $c->_flash_key_hashes || {}; |
165 | my $keep = $c->_flash_keep_keys || {}; |
166 | foreach my $key ( keys %$hashes ) { |
167 | if ( !exists $keep->{$key} and Object::Signature::signature( \$flash_data->{$key} ) eq $hashes->{$key} ) { |
168 | delete $flash_data->{$key}; |
23fbca00 |
169 | } |
ea972e9a |
170 | } |
1dbf4cd5 |
171 | |
172 | my $sid = $c->sessionid; |
173 | |
eb250519 |
174 | my $session_data = $c->_session; |
1dbf4cd5 |
175 | if (%$flash_data) { |
eb250519 |
176 | $session_data->{__flash} = $flash_data; |
1dbf4cd5 |
177 | } |
178 | else { |
eb250519 |
179 | delete $session_data->{__flash}; |
1dbf4cd5 |
180 | } |
eb250519 |
181 | $c->_session($session_data); |
182 | $c->_save_session; |
9b0fa2a6 |
183 | } |
9e447f9d |
184 | } |
185 | |
e5b2372a |
186 | sub _load_session_expires { |
187 | my $c = shift; |
b92ce604 |
188 | return $c->_session_expires if $c->_tried_loading_session_expires; |
1dbf4cd5 |
189 | $c->_tried_loading_session_expires(1); |
e5b2372a |
190 | |
191 | if ( my $sid = $c->sessionid ) { |
192 | my $expires = $c->get_session_data("expires:$sid") || 0; |
193 | |
194 | if ( $expires >= time() ) { |
260b14c4 |
195 | $c->_session_expires( $expires ); |
196 | return $expires; |
e5b2372a |
197 | } else { |
198 | $c->delete_session( "session expired" ); |
199 | return 0; |
200 | } |
e5b2372a |
201 | } |
1dbf4cd5 |
202 | |
203 | return; |
e5b2372a |
204 | } |
205 | |
b7acf64e |
206 | sub _load_session { |
207 | my $c = shift; |
b92ce604 |
208 | return $c->_session if $c->_tried_loading_session_data; |
1dbf4cd5 |
209 | $c->_tried_loading_session_data(1); |
b7acf64e |
210 | |
e5b2372a |
211 | if ( my $sid = $c->sessionid ) { |
260b14c4 |
212 | if ( $c->_load_session_expires ) { # > 0 |
0974ac06 |
213 | |
2e412459 |
214 | my $session_data = $c->get_session_data("session:$sid") || return; |
6687905d |
215 | $c->_session($session_data); |
3f182468 |
216 | |
6687905d |
217 | no warnings 'uninitialized'; # ne __address |
218 | if ( $c->config->{session}{verify_address} |
219 | && $session_data->{__address} ne $c->request->address ) |
220 | { |
221 | $c->log->warn( |
222 | "Deleting session $sid due to address mismatch (" |
223 | . $session_data->{__address} . " != " |
47ca362e |
224 | . $c->request->address . ")" |
6687905d |
225 | ); |
226 | $c->delete_session("address mismatch"); |
227 | return; |
228 | } |
06c621b5 |
229 | if ( $c->config->{session}{verify_user_agent} |
230 | && $session_data->{__user_agent} ne $c->request->user_agent ) |
231 | { |
232 | $c->log->warn( |
233 | "Deleting session $sid due to user agent mismatch (" |
234 | . $session_data->{__user_agent} . " != " |
235 | . $c->request->user_agent . ")" |
236 | ); |
237 | $c->delete_session("user agent mismatch"); |
238 | return; |
239 | } |
4207ce8d |
240 | |
6687905d |
241 | $c->log->debug(qq/Restored session "$sid"/) if $c->debug; |
168d6819 |
242 | $c->_session_data_sig( Object::Signature::signature($session_data) ) if $session_data; |
6687905d |
243 | $c->_expire_session_keys; |
4207ce8d |
244 | |
6687905d |
245 | return $session_data; |
3f182468 |
246 | } |
9a9252c2 |
247 | } |
29d15411 |
248 | |
4207ce8d |
249 | return; |
b7acf64e |
250 | } |
9a9252c2 |
251 | |
9b0fa2a6 |
252 | sub _load_flash { |
253 | my $c = shift; |
b92ce604 |
254 | return $c->_flash if $c->_tried_loading_flash_data; |
1dbf4cd5 |
255 | $c->_tried_loading_flash_data(1); |
9b0fa2a6 |
256 | |
e5b2372a |
257 | if ( my $sid = $c->sessionid ) { |
eb250519 |
258 | |
259 | my $session_data = $c->session; |
260 | $c->_flash($session_data->{__flash}); |
261 | |
262 | if ( my $flash_data = $c->_flash ) |
4207ce8d |
263 | { |
f4d79f85 |
264 | $c->_flash_key_hashes({ map { $_ => Object::Signature::signature( \$flash_data->{$_} ) } keys %$flash_data }); |
e5b2372a |
265 | |
9b0fa2a6 |
266 | return $flash_data; |
267 | } |
268 | } |
269 | |
1dbf4cd5 |
270 | return; |
9b0fa2a6 |
271 | } |
272 | |
d44bc687 |
273 | sub _expire_session_keys { |
b7acf64e |
274 | my ( $c, $data ) = @_; |
275 | |
276 | my $now = time; |
277 | |
e5b2372a |
278 | my $expire_times = ( $data || $c->_session || {} )->{__expire_keys} || {}; |
279 | foreach my $key ( grep { $expire_times->{$_} < $now } keys %$expire_times ) { |
b7acf64e |
280 | delete $c->_session->{$key}; |
e5b2372a |
281 | delete $expire_times->{$key}; |
b7acf64e |
282 | } |
9e447f9d |
283 | } |
284 | |
260b14c4 |
285 | sub _clear_session_instance_data { |
286 | my $c = shift; |
287 | $c->$_(undef) for @session_data_accessors; |
fe0d5ebe |
288 | $c->maybe::next::method(@_); # allow other plugins to hook in on this |
260b14c4 |
289 | } |
290 | |
9e447f9d |
291 | sub delete_session { |
9a9252c2 |
292 | my ( $c, $msg ) = @_; |
9e447f9d |
293 | |
49727697 |
294 | $c->log->debug("Deleting session" . ( defined($msg) ? "($msg)" : '(no reason given)') ) if $c->debug; |
b92ce604 |
295 | |
9a9252c2 |
296 | # delete the session data |
b92ce604 |
297 | if ( my $sid = $c->sessionid ) { |
298 | $c->delete_session_data("${_}:${sid}") for qw/session expires flash/; |
c6eaa93a |
299 | $c->delete_session_id($sid); |
b92ce604 |
300 | } |
e5b2372a |
301 | |
9a9252c2 |
302 | # reset the values in the context object |
ab634fee |
303 | # see the BEGIN block |
260b14c4 |
304 | $c->_clear_session_instance_data; |
6687905d |
305 | |
29d15411 |
306 | $c->_session_delete_reason($msg); |
307 | } |
308 | |
309 | sub session_delete_reason { |
310 | my $c = shift; |
311 | |
e5b2372a |
312 | $c->session_is_valid; # check that it was loaded |
29d15411 |
313 | |
4207ce8d |
314 | $c->_session_delete_reason(@_); |
9e447f9d |
315 | } |
316 | |
6687905d |
317 | sub session_expires { |
e5b2372a |
318 | my $c = shift; |
6687905d |
319 | |
260b14c4 |
320 | if ( defined( my $expires = $c->_extended_session_expires ) ) { |
e5b2372a |
321 | return $expires; |
1dbf4cd5 |
322 | } elsif ( defined( $expires = $c->_load_session_expires ) ) { |
260b14c4 |
323 | return $c->extend_session_expires( $expires ); |
e5b2372a |
324 | } else { |
1dbf4cd5 |
325 | return 0; |
e5b2372a |
326 | } |
327 | } |
6687905d |
328 | |
e5b2372a |
329 | sub extend_session_expires { |
330 | my ( $c, $expires ) = @_; |
260b14c4 |
331 | $c->_extended_session_expires( my $updated = $c->calculate_extended_session_expires( $expires ) ); |
4c79feb6 |
332 | $c->extend_session_id( $c->sessionid, $updated ); |
e5b2372a |
333 | return $updated; |
334 | } |
6687905d |
335 | |
e5b2372a |
336 | sub calculate_initial_session_expires { |
337 | my $c = shift; |
338 | return ( time() + $c->config->{session}{expires} ); |
339 | } |
340 | |
341 | sub calculate_extended_session_expires { |
342 | my ( $c, $prev ) = @_; |
343 | $c->calculate_initial_session_expires; |
344 | } |
345 | |
346 | sub reset_session_expires { |
347 | my ( $c, $sid ) = @_; |
260b14c4 |
348 | |
349 | my $exp = $c->calculate_initial_session_expires; |
350 | $c->_session_expires( $exp ); |
351 | $c->_extended_session_expires( $exp ); |
e5b2372a |
352 | $exp; |
6687905d |
353 | } |
354 | |
0974ac06 |
355 | sub sessionid { |
4207ce8d |
356 | my $c = shift; |
e5b2372a |
357 | |
1dbf4cd5 |
358 | return $c->_sessionid || $c->_load_sessionid; |
359 | } |
360 | |
361 | sub _load_sessionid { |
362 | my $c = shift; |
363 | return if $c->_tried_loading_session_id; |
364 | $c->_tried_loading_session_id(1); |
365 | |
366 | if ( defined( my $sid = $c->get_session_id ) ) { |
367 | if ( $c->validate_session_id($sid) ) { |
ec299c02 |
368 | # temporarily set the inner key, so that validation will work |
369 | $c->_sessionid($sid); |
1dbf4cd5 |
370 | return $sid; |
371 | } else { |
372 | my $err = "Tried to set invalid session ID '$sid'"; |
373 | $c->log->error($err); |
374 | Catalyst::Exception->throw($err); |
4207ce8d |
375 | } |
376 | } |
1dbf4cd5 |
377 | |
378 | return; |
e5b2372a |
379 | } |
380 | |
381 | sub session_is_valid { |
382 | my $c = shift; |
4207ce8d |
383 | |
b92ce604 |
384 | # force a check for expiry, but also __address, etc |
385 | if ( $c->_load_session ) { |
e5b2372a |
386 | return 1; |
387 | } else { |
388 | return; |
389 | } |
0974ac06 |
390 | } |
391 | |
392 | sub validate_session_id { |
4207ce8d |
393 | my ( $c, $sid ) = @_; |
0974ac06 |
394 | |
4207ce8d |
395 | $sid and $sid =~ /^[a-f\d]+$/i; |
0974ac06 |
396 | } |
397 | |
9e447f9d |
398 | sub session { |
9a9252c2 |
399 | my $c = shift; |
9e447f9d |
400 | |
29d15411 |
401 | $c->_session || $c->_load_session || do { |
1dbf4cd5 |
402 | $c->create_session_id_if_needed; |
29d15411 |
403 | $c->initialize_session_data; |
4207ce8d |
404 | }; |
9e447f9d |
405 | } |
406 | |
f4d79f85 |
407 | sub keep_flash { |
408 | my ( $c, @keys ) = @_; |
2e412459 |
409 | my $href = $c->_flash_keep_keys || $c->_flash_keep_keys({}); |
410 | (@{$href}{@keys}) = ((undef) x @keys); |
f4d79f85 |
411 | } |
412 | |
c9396824 |
413 | sub _flash_data { |
873f7011 |
414 | my $c = shift; |
78476ce0 |
415 | $c->_flash || $c->_load_flash || do { |
1dbf4cd5 |
416 | $c->create_session_id_if_needed; |
78476ce0 |
417 | $c->_flash( {} ); |
c9396824 |
418 | }; |
419 | } |
420 | |
421 | sub _set_flash { |
422 | my $c = shift; |
423 | if (@_) { |
424 | my $items = @_ > 1 ? {@_} : $_[0]; |
425 | croak('flash takes a hash or hashref') unless ref $items; |
426 | @{ $c->_flash }{ keys %$items } = values %$items; |
1dbf4cd5 |
427 | } |
873f7011 |
428 | } |
429 | |
c9396824 |
430 | sub flash { |
431 | my $c = shift; |
432 | $c->_flash_data; |
f6009cac |
433 | $c->_set_flash(@_); |
434 | return $c->_flash; |
c9396824 |
435 | } |
436 | |
49727697 |
437 | sub clear_flash { |
438 | my $c = shift; |
5a1f6ed4 |
439 | |
440 | #$c->delete_session_data("flash:" . $c->sessionid); # should this be in here? or delayed till finalization? |
49727697 |
441 | $c->_flash_key_hashes({}); |
5a1f6ed4 |
442 | $c->_flash_keep_keys({}); |
49727697 |
443 | $c->_flash({}); |
444 | } |
445 | |
b7acf64e |
446 | sub session_expire_key { |
447 | my ( $c, %keys ) = @_; |
448 | |
449 | my $now = time; |
4207ce8d |
450 | @{ $c->session->{__expire_keys} }{ keys %keys } = |
451 | map { $now + $_ } values %keys; |
b7acf64e |
452 | } |
453 | |
9e447f9d |
454 | sub initialize_session_data { |
9a9252c2 |
455 | my $c = shift; |
9e447f9d |
456 | |
9a9252c2 |
457 | my $now = time; |
9e447f9d |
458 | |
4207ce8d |
459 | return $c->_session( |
460 | { |
461 | __created => $now, |
462 | __updated => $now, |
463 | |
464 | ( |
465 | $c->config->{session}{verify_address} |
466 | ? ( __address => $c->request->address ) |
467 | : () |
468 | ), |
06c621b5 |
469 | ( |
470 | $c->config->{session}{verify_user_agent} |
471 | ? ( __user_agent => $c->request->user_agent ) |
472 | : () |
473 | ), |
4207ce8d |
474 | } |
475 | ); |
9e447f9d |
476 | } |
477 | |
9e447f9d |
478 | sub generate_session_id { |
479 | my $c = shift; |
480 | |
481 | my $digest = $c->_find_digest(); |
482 | $digest->add( $c->session_hash_seed() ); |
483 | return $digest->hexdigest; |
484 | } |
485 | |
1dbf4cd5 |
486 | sub create_session_id_if_needed { |
78476ce0 |
487 | my $c = shift; |
1dbf4cd5 |
488 | $c->create_session_id unless $c->sessionid; |
489 | } |
78476ce0 |
490 | |
1dbf4cd5 |
491 | sub create_session_id { |
492 | my $c = shift; |
493 | |
e5b2372a |
494 | my $sid = $c->generate_session_id; |
78476ce0 |
495 | |
e5b2372a |
496 | $c->log->debug(qq/Created session "$sid"/) if $c->debug; |
78476ce0 |
497 | |
e5b2372a |
498 | $c->_sessionid($sid); |
499 | $c->reset_session_expires; |
500 | $c->set_session_id($sid); |
501 | |
502 | return $sid; |
78476ce0 |
503 | } |
504 | |
9e447f9d |
505 | my $counter; |
9a9252c2 |
506 | |
9e447f9d |
507 | sub session_hash_seed { |
9a9252c2 |
508 | my $c = shift; |
509 | |
510 | return join( "", ++$counter, time, rand, $$, {}, overload::StrVal($c), ); |
9e447f9d |
511 | } |
512 | |
513 | my $usable; |
9a9252c2 |
514 | |
9e447f9d |
515 | sub _find_digest () { |
9a9252c2 |
516 | unless ($usable) { |
d44bc687 |
517 | foreach my $alg (qw/SHA-1 SHA-256 MD5/) { |
4207ce8d |
518 | if ( eval { Digest->new($alg) } ) { |
5faaa4b0 |
519 | $usable = $alg; |
520 | last; |
521 | } |
7d139eeb |
522 | } |
4207ce8d |
523 | Catalyst::Exception->throw( |
9a9252c2 |
524 | "Could not find a suitable Digest module. Please install " |
4207ce8d |
525 | . "Digest::SHA1, Digest::SHA, or Digest::MD5" ) |
526 | unless $usable; |
9a9252c2 |
527 | } |
9e447f9d |
528 | |
529 | return Digest->new($usable); |
530 | } |
531 | |
99b2191e |
532 | sub dump_these { |
533 | my $c = shift; |
534 | |
535 | ( |
fe0d5ebe |
536 | $c->maybe::next::method(), |
99b2191e |
537 | |
538 | $c->sessionid |
539 | ? ( [ "Session ID" => $c->sessionid ], [ Session => $c->session ], ) |
540 | : () |
541 | ); |
542 | } |
543 | |
e5b2372a |
544 | |
fe0d5ebe |
545 | sub get_session_id { shift->maybe::next::method(@_) } |
546 | sub set_session_id { shift->maybe::next::method(@_) } |
547 | sub delete_session_id { shift->maybe::next::method(@_) } |
548 | sub extend_session_id { shift->maybe::next::method(@_) } |
e5b2372a |
549 | |
9e447f9d |
550 | __PACKAGE__; |
551 | |
552 | __END__ |
553 | |
554 | =pod |
555 | |
556 | =head1 NAME |
557 | |
7048c24e |
558 | Catalyst::Plugin::Session - Generic Session plugin - ties together server side storage and client side state required to maintain session data. |
9e447f9d |
559 | |
560 | =head1 SYNOPSIS |
561 | |
8f0b4c16 |
562 | # To get sessions to "just work", all you need to do is use these plugins: |
563 | |
564 | use Catalyst qw/ |
565 | Session |
566 | Session::Store::FastMmap |
567 | Session::State::Cookie |
568 | /; |
569 | |
7048c24e |
570 | # you can replace Store::FastMmap with Store::File - both have sensible |
571 | # default configurations (see their docs for details) |
8f0b4c16 |
572 | |
7048c24e |
573 | # more complicated backends are available for other scenarios (DBI storage, |
574 | # etc) |
8f0b4c16 |
575 | |
576 | |
577 | # after you've loaded the plugins you can save session data |
578 | # For example, if you are writing a shopping cart, it could be implemented |
579 | # like this: |
9e447f9d |
580 | |
229a5b53 |
581 | sub add_item : Local { |
582 | my ( $self, $c ) = @_; |
583 | |
584 | my $item_id = $c->req->param("item"); |
585 | |
8f0b4c16 |
586 | # $c->session is a hash ref, a bit like $c->stash |
587 | # the difference is that it' preserved across requests |
229a5b53 |
588 | |
589 | push @{ $c->session->{items} }, $item_id; |
590 | |
591 | $c->forward("MyView"); |
592 | } |
593 | |
594 | sub display_items : Local { |
595 | my ( $self, $c ) = @_; |
596 | |
597 | # values in $c->session are restored |
598 | $c->stash->{items_to_display} = |
8f0b4c16 |
599 | [ map { MyModel->retrieve($_) } @{ $c->session->{items} } ]; |
229a5b53 |
600 | |
601 | $c->forward("MyView"); |
602 | } |
603 | |
9e447f9d |
604 | =head1 DESCRIPTION |
605 | |
606 | The Session plugin is the base of two related parts of functionality required |
607 | for session management in web applications. |
608 | |
609 | The first part, the State, is getting the browser to repeat back a session key, |
610 | so that the web application can identify the client and logically string |
611 | several requests together into a session. |
612 | |
613 | The second part, the Store, deals with the actual storage of information about |
614 | the client. This data is stored so that the it may be revived for every request |
615 | made by the same client. |
616 | |
617 | This plugin links the two pieces together. |
618 | |
2a323f6f |
619 | =head1 RECOMENDED BACKENDS |
8f0b4c16 |
620 | |
621 | =over 4 |
622 | |
623 | =item Session::State::Cookie |
624 | |
625 | The only really sane way to do state is using cookies. |
626 | |
627 | =item Session::Store::File |
628 | |
629 | A portable backend, based on Cache::File. |
630 | |
631 | =item Session::Store::FastMmap |
632 | |
633 | A fast and flexible backend, based on Cache::FastMmap. |
634 | |
635 | =back |
636 | |
9e447f9d |
637 | =head1 METHODS |
638 | |
639 | =over 4 |
640 | |
641 | =item sessionid |
642 | |
643 | An accessor for the session ID value. |
644 | |
645 | =item session |
646 | |
647 | Returns a hash reference that might contain unserialized values from previous |
648 | requests in the same session, and whose modified value will be saved for future |
649 | requests. |
650 | |
651 | This method will automatically create a new session and session ID if none |
652 | exists. |
653 | |
ab634fee |
654 | =item session_expires |
655 | |
656 | =item session_expires $reset |
657 | |
658 | This method returns the time when the current session will expire, or 0 if |
659 | there is no current session. If there is a session and it already expired, it |
660 | will delete the session and return 0 as well. |
661 | |
662 | If the C<$reset> parameter is true, and there is a session ID the expiry time |
663 | will be reset to the current time plus the time to live (see |
664 | L</CONFIGURATION>). This is used when creating a new session. |
665 | |
07e714d2 |
666 | =item flash |
667 | |
668 | This is like Ruby on Rails' flash data structure. Think of it as a stash that |
44ab6d1c |
669 | lasts for longer than one request, letting you redirect instead of forward. |
670 | |
671 | The flash data will be cleaned up only on requests on which actually use |
672 | $c->flash (thus allowing multiple redirections), and the policy is to delete |
bf6bd311 |
673 | all the keys which haven't changed since the flash data was loaded at the end |
674 | of every request. |
07e714d2 |
675 | |
676 | sub moose : Local { |
677 | my ( $self, $c ) = @_; |
678 | |
679 | $c->flash->{beans} = 10; |
680 | $c->response->redirect( $c->uri_for("foo") ); |
681 | } |
682 | |
683 | sub foo : Local { |
684 | my ( $self, $c ) = @_; |
685 | |
686 | my $value = $c->flash->{beans}; |
687 | |
688 | # ... |
689 | |
690 | $c->response->redirect( $c->uri_for("bar") ); |
691 | } |
692 | |
693 | sub bar : Local { |
694 | my ( $self, $c ) = @_; |
695 | |
696 | if ( exists $c->flash->{beans} ) { # false |
697 | |
698 | } |
699 | } |
700 | |
49727697 |
701 | =item clear_flash |
702 | |
703 | Zap all the keys in the flash regardless of their current state. |
704 | |
bf6bd311 |
705 | =item keep_flash @keys |
706 | |
1961343c |
707 | If you want to keep a flash key for the next request too, even if it hasn't |
bf6bd311 |
708 | changed, call C<keep_flash> and pass in the keys as arguments. |
709 | |
fffeb18f |
710 | =item delete_session REASON |
711 | |
712 | This method is used to invalidate a session. It takes an optional parameter |
713 | which will be saved in C<session_delete_reason> if provided. |
714 | |
eb250519 |
715 | NOTE: This method will B<also> delete your flash data. |
716 | |
9e447f9d |
717 | =item session_delete_reason |
718 | |
719 | This accessor contains a string with the reason a session was deleted. Possible |
720 | values include: |
721 | |
722 | =over 4 |
723 | |
724 | =item * |
725 | |
726 | C<address mismatch> |
727 | |
728 | =item * |
729 | |
730 | C<session expired> |
731 | |
732 | =back |
733 | |
b7acf64e |
734 | =item session_expire_key $key, $ttl |
735 | |
736 | Mark a key to expire at a certain time (only useful when shorter than the |
737 | expiry time for the whole session). |
738 | |
739 | For example: |
740 | |
741 | __PACKAGE__->config->{session}{expires} = 1000000000000; # forever |
742 | |
743 | # later |
744 | |
745 | $c->session_expire_key( __user => 3600 ); |
746 | |
747 | Will make the session data survive, but the user will still be logged out after |
748 | an hour. |
749 | |
750 | Note that these values are not auto extended. |
751 | |
8f0b4c16 |
752 | =back |
753 | |
10c72079 |
754 | =head1 INTERNAL METHODS |
8f0b4c16 |
755 | |
756 | =over 4 |
757 | |
9e447f9d |
758 | =item setup |
759 | |
760 | This method is extended to also make calls to |
761 | C<check_session_plugin_requirements> and C<setup_session>. |
762 | |
763 | =item check_session_plugin_requirements |
764 | |
765 | This method ensures that a State and a Store plugin are also in use by the |
766 | application. |
767 | |
768 | =item setup_session |
769 | |
770 | This method populates C<< $c->config->{session} >> with the default values |
771 | listed in L</CONFIGURATION>. |
772 | |
773 | =item prepare_action |
774 | |
bfa4f9cc |
775 | This method is extended. |
68fd02ae |
776 | |
bfa4f9cc |
777 | Its only effect is if the (off by default) C<flash_to_stash> configuration |
68fd02ae |
778 | parameter is on - then it will copy the contents of the flash to the stash at |
779 | prepare time. |
9e447f9d |
780 | |
ccc77553 |
781 | =item finalize_headers |
9e447f9d |
782 | |
d3c97126 |
783 | This method is extended and will extend the expiry time before sending |
784 | the response. |
785 | |
92eaec32 |
786 | =item finalize_body |
d3c97126 |
787 | |
92eaec32 |
788 | This method is extended and will call finalize_session before the other |
789 | finalize_body methods run. Here we persist the session data if a session exists. |
9e447f9d |
790 | |
9e447f9d |
791 | =item initialize_session_data |
792 | |
793 | This method will initialize the internal structure of the session, and is |
794 | called by the C<session> method if appropriate. |
795 | |
68fd02ae |
796 | =item create_session_id |
797 | |
bfa4f9cc |
798 | Creates a new session ID using C<generate_session_id> if there is no session ID |
68fd02ae |
799 | yet. |
800 | |
ab634fee |
801 | =item validate_session_id SID |
802 | |
803 | Make sure a session ID is of the right format. |
804 | |
805 | This currently ensures that the session ID string is any amount of case |
806 | insensitive hexadecimal characters. |
807 | |
229a5b53 |
808 | =item generate_session_id |
809 | |
810 | This method will return a string that can be used as a session ID. It is |
811 | supposed to be a reasonably random string with enough bits to prevent |
812 | collision. It basically takes C<session_hash_seed> and hashes it using SHA-1, |
bfa4f9cc |
813 | MD5 or SHA-256, depending on the availability of these modules. |
229a5b53 |
814 | |
815 | =item session_hash_seed |
816 | |
817 | This method is actually rather internal to generate_session_id, but should be |
818 | overridable in case you want to provide more random data. |
819 | |
820 | Currently it returns a concatenated string which contains: |
821 | |
822 | =over 4 |
823 | |
7048c24e |
824 | =item * A counter |
229a5b53 |
825 | |
7048c24e |
826 | =item * The current time |
229a5b53 |
827 | |
7048c24e |
828 | =item * One value from C<rand>. |
229a5b53 |
829 | |
7048c24e |
830 | =item * The stringified value of a newly allocated hash reference |
229a5b53 |
831 | |
7048c24e |
832 | =item * The stringified value of the Catalyst context object |
229a5b53 |
833 | |
834 | =back |
835 | |
bfa4f9cc |
836 | in the hopes that those combined values are entropic enough for most uses. If |
229a5b53 |
837 | this is not the case you can replace C<session_hash_seed> with e.g. |
838 | |
839 | sub session_hash_seed { |
840 | open my $fh, "<", "/dev/random"; |
841 | read $fh, my $bytes, 20; |
842 | close $fh; |
843 | return $bytes; |
844 | } |
845 | |
846 | Or even more directly, replace C<generate_session_id>: |
847 | |
848 | sub generate_session_id { |
849 | open my $fh, "<", "/dev/random"; |
850 | read $fh, my $bytes, 20; |
851 | close $fh; |
852 | return unpack("H*", $bytes); |
853 | } |
854 | |
855 | Also have a look at L<Crypt::Random> and the various openssl bindings - these |
856 | modules provide APIs for cryptographically secure random data. |
857 | |
8f236527 |
858 | =item finalize_session |
859 | |
860 | Clean up the session during C<finalize>. |
861 | |
862 | This clears the various accessors after saving to the store. |
863 | |
99b2191e |
864 | =item dump_these |
865 | |
866 | See L<Catalyst/dump_these> - ammends the session data structure to the list of |
867 | dumped objects if session ID is defined. |
868 | |
d3c97126 |
869 | |
870 | =item calculate_extended_session_expires |
871 | |
872 | =item calculate_initial_session_expires |
873 | |
874 | =item create_session_id_if_needed |
875 | |
876 | =item delete_session_id |
877 | |
878 | =item extend_session_expires |
879 | |
880 | =item extend_session_id |
881 | |
882 | =item get_session_id |
883 | |
884 | =item reset_session_expires |
885 | |
886 | =item session_is_valid |
887 | |
888 | =item set_session_id |
889 | |
9e447f9d |
890 | =back |
891 | |
a92c8aeb |
892 | =head1 USING SESSIONS DURING PREPARE |
893 | |
894 | The earliest point in time at which you may use the session data is after |
895 | L<Catalyst::Plugin::Session>'s C<prepare_action> has finished. |
896 | |
897 | State plugins must set $c->session ID before C<prepare_action>, and during |
898 | C<prepare_action> L<Catalyst::Plugin::Session> will actually load the data from |
899 | the store. |
900 | |
7048c24e |
901 | sub prepare_action { |
902 | my $c = shift; |
a92c8aeb |
903 | |
7048c24e |
904 | # don't touch $c->session yet! |
b1cd7d77 |
905 | |
7048c24e |
906 | $c->NEXT::prepare_action( @_ ); |
a92c8aeb |
907 | |
7048c24e |
908 | $c->session; # this is OK |
909 | $c->sessionid; # this is also OK |
910 | } |
a92c8aeb |
911 | |
9e447f9d |
912 | =head1 CONFIGURATION |
913 | |
229a5b53 |
914 | $c->config->{session} = { |
915 | expires => 1234, |
916 | }; |
9e447f9d |
917 | |
918 | All configuation parameters are provided in a hash reference under the |
919 | C<session> key in the configuration hash. |
920 | |
921 | =over 4 |
922 | |
923 | =item expires |
924 | |
925 | The time-to-live of each session, expressed in seconds. Defaults to 7200 (two |
926 | hours). |
927 | |
928 | =item verify_address |
929 | |
8c7e922c |
930 | When true, C<<$c->request->address>> will be checked at prepare time. If it is |
931 | not the same as the address that initiated the session, the session is deleted. |
9e447f9d |
932 | |
33641c1d |
933 | Defaults to false. |
934 | |
06c621b5 |
935 | =item verify_user_agent |
936 | |
937 | When true, C<<$c->request->user_agent>> will be checked at prepare time. If it |
938 | is not the same as the user agent that initiated the session, the session is |
939 | deleted. |
940 | |
941 | Defaults to false. |
942 | |
68fd02ae |
943 | =item flash_to_stash |
944 | |
945 | This option makes it easier to have actions behave the same whether they were |
946 | forwarded to or redirected to. On prepare time it copies the contents of |
947 | C<flash> (if any) to the stash. |
948 | |
9e447f9d |
949 | =back |
950 | |
951 | =head1 SPECIAL KEYS |
952 | |
953 | The hash reference returned by C<< $c->session >> contains several keys which |
954 | are automatically set: |
955 | |
956 | =over 4 |
957 | |
958 | =item __expires |
959 | |
ab634fee |
960 | This key no longer exists. Use C<session_expires> instead. |
9e447f9d |
961 | |
962 | =item __updated |
963 | |
d44bc687 |
964 | The last time a session was saved to the store. |
9e447f9d |
965 | |
966 | =item __created |
967 | |
968 | The time when the session was first created. |
969 | |
970 | =item __address |
971 | |
972 | The value of C<< $c->request->address >> at the time the session was created. |
8c7e922c |
973 | This value is only populated if C<verify_address> is true in the configuration. |
9e447f9d |
974 | |
06c621b5 |
975 | =item __user_agent |
976 | |
e79a686c |
977 | The value of C<< $c->request->user_agent >> at the time the session was created. |
06c621b5 |
978 | This value is only populated if C<verify_user_agent> is true in the configuration. |
979 | |
9e447f9d |
980 | =back |
981 | |
c80e9f04 |
982 | =head1 CAVEATS |
983 | |
a552e4b5 |
984 | =head2 Round the Robin Proxies |
985 | |
c80e9f04 |
986 | C<verify_address> could make your site inaccessible to users who are behind |
987 | load balanced proxies. Some ISPs may give a different IP to each request by the |
988 | same client due to this type of proxying. If addresses are verified these |
989 | users' sessions cannot persist. |
990 | |
991 | To let these users access your site you can either disable address verification |
992 | as a whole, or provide a checkbox in the login dialog that tells the server |
993 | that it's OK for the address of the client to change. When the server sees that |
bfa4f9cc |
994 | this box is checked it should delete the C<__address> special key from the |
c80e9f04 |
995 | session hash when the hash is first created. |
996 | |
a552e4b5 |
997 | =head2 Race Conditions |
998 | |
bfa4f9cc |
999 | In this day and age where cleaning detergents and Dutch football (not the |
1000 | American kind) teams roam the plains in great numbers, requests may happen |
a552e4b5 |
1001 | simultaneously. This means that there is some risk of session data being |
1002 | overwritten, like this: |
1003 | |
1004 | =over 4 |
1005 | |
1006 | =item 1. |
1007 | |
bfa4f9cc |
1008 | request a starts, request b starts, with the same session ID |
a552e4b5 |
1009 | |
1010 | =item 2. |
1011 | |
1012 | session data is loaded in request a |
1013 | |
1014 | =item 3. |
1015 | |
1016 | session data is loaded in request b |
1017 | |
1018 | =item 4. |
1019 | |
1020 | session data is changed in request a |
1021 | |
1022 | =item 5. |
1023 | |
1024 | request a finishes, session data is updated and written to store |
1025 | |
1026 | =item 6. |
1027 | |
1028 | request b finishes, session data is updated and written to store, overwriting |
1029 | changes by request a |
1030 | |
1031 | =back |
1032 | |
bfa4f9cc |
1033 | If this is a concern in your application, a soon-to-be-developed locking |
a552e4b5 |
1034 | solution is the only safe way to go. This will have a bigger overhead. |
1035 | |
1036 | For applications where any given user is only making one request at a time this |
1037 | plugin should be safe enough. |
1038 | |
d45028d6 |
1039 | =head1 AUTHORS |
1040 | |
7048c24e |
1041 | Andy Grundman |
baa9db9c |
1042 | |
7048c24e |
1043 | Christian Hansen |
baa9db9c |
1044 | |
2842d938 |
1045 | Yuval Kogman, C<nothingmuch@woobling.org> |
baa9db9c |
1046 | |
7048c24e |
1047 | Sebastian Riedel |
baa9db9c |
1048 | |
2842d938 |
1049 | Tomas Doran (t0m) C<bobtfish@bobtfish.net> (current maintainer) |
1050 | |
1051 | Sergio Salvi |
1052 | |
baa9db9c |
1053 | And countless other contributers from #catalyst. Thanks guys! |
d45028d6 |
1054 | |
cc40ae4b |
1055 | =head1 COPYRIGHT & LICENSE |
d45028d6 |
1056 | |
7048c24e |
1057 | Copyright (c) 2005 the aforementioned authors. All rights |
1058 | reserved. This program is free software; you can redistribute |
1059 | it and/or modify it under the same terms as Perl itself. |
d45028d6 |
1060 | |
9e447f9d |
1061 | =cut |
1062 | |
1063 | |