2 use base qw(Class::Accessor::Fast Class::Data::Inheritable);
3 use UNIVERSAL::require;
7 use Maypole::Constants;
10 our $VERSION = '2.11';
12 # proposed privacy conventions:
13 # - no leading underscore - public to custom application code and plugins
14 # - single leading underscore - private to the main Maypole stack - *not*
16 # - double leading underscore - private to the current package
18 __PACKAGE__->mk_classdata($_) for qw( config init_done view_object );
19 __PACKAGE__->mk_accessors(
20 qw( params query objects model_class template_args output path
21 args action template error document_encoding content_type table
22 headers_in headers_out stash)
24 __PACKAGE__->config( Maypole::Config->new() );
25 __PACKAGE__->init_done(0);
31 my $calling_class = shift;
33 $calling_class = ref $calling_class if ref $calling_class;
35 my $config = $calling_class->config;
37 $config->model || $config->model('Maypole::Model::CDBI');
39 $config->model->require or die sprintf
40 "Couldn't load the model class %s: %s", $config->model, $@;
42 $config->model->setup_database($config, $calling_class, @_);
44 foreach my $subclass ( @{ $config->classes } )
47 unshift @{ $subclass . "::ISA" }, $config->model;
48 $config->model->adopt($subclass)
49 if $config->model->can("adopt");
56 my $config = $class->config;
57 $config->view || $config->view("Maypole::View::TT");
58 $config->view->require;
59 die "Couldn't load the view class " . $config->view . ": $@" if $@;
60 $config->display_tables
61 || $config->display_tables( $class->config->tables );
62 $class->view_object( $class->config->view->new );
73 config => $class->config,
79 # handler() has a method attribute so that mod_perl will invoke
80 # BeerDB->handler() as a method rather than a plain function
81 # BeerDB::handler() and so this inherited implementation will be
82 # found. See e.g. "Practical mod_perl" by Bekman & Cholet for
83 # more information <http://modperlbook.org/html/ch25_01.html>
86 # See Maypole::Workflow before trying to understand this.
87 my ($class, $req) = @_;
89 $class->init unless $class->init_done;
91 my $self = $class->new;
93 # initialise the request
94 $self->headers_out(Maypole::Headers->new);
95 $self->get_request($req);
96 $self->parse_location;
98 my $status = $self->handler_guts;
100 # moving this here causes unit test failures - need to check why
101 # before committing the move
102 #$status = $self->__call_process_view unless $self->output;
104 return $status unless $status == OK;
111 # The root of all evil
118 my $applicable = __to_boolean( $self->is_applicable );
120 $self->__setup_plain_template unless $applicable;
122 # We authenticate every request, needed for proper session management
125 eval { $status = $self->call_authenticate };
127 if ( my $error = $@ )
129 $status = $self->call_exception($error);
133 warn "caught authenticate error: $error";
134 return $self->debug ?
135 $self->view_object->error($self, $error) : ERROR;
139 if ( $self->debug and $status != OK and $status != DECLINED )
141 $self->view_object->error( $self,
142 "Got unexpected status $status from calling authentication" );
145 return $status unless $status == OK;
147 # We run additional_data for every request
148 $self->additional_data;
152 eval { $self->model_class->process($self) };
154 if ( my $error = $@ )
156 $status = $self->call_exception($error);
160 warn "caught model error: $error";
161 return $self->debug ?
162 $self->view_object->error($self, $error) : ERROR;
167 # less frequent path - perhaps output has been set to an error message
168 return OK if $self->output;
170 # normal path - no output has been generated yet
171 return $self->__call_process_view;
174 # is_applicable() returned false, so set up a plain template. Model processing
175 # will be skipped, but need to remove the model anyway so the template can't
177 sub __setup_plain_template
181 # It's just a plain template
182 $self->model_class(undef);
184 my $path = $self->path;
185 $path =~ s{/$}{}; # De-absolutify
188 $self->template($self->path);
191 # The model has been processed or skipped (if is_applicable returned false),
192 # any exceptions have been handled, and there's no content in $self->output
193 sub __call_process_view
199 eval { $status = $self->view_object->process($self) };
201 if ( my $error = $@ )
203 $status = $self->call_exception($error);
207 warn "caught view error: $error" if $self->debug;
208 return $self->debug ?
209 $self->view_object->error($self, $error) : ERROR;
219 $self->model_class( $self->config->model->class_of($self, $self->table) );
222 # is_applicable() should return true or false, not OK or DECLINED, because
223 # the return value is never used as the return value from handler(). There's
224 # probably a lot of code out there supplying the return codes though, so
225 # instead of changing is_applicable() to return 0 or 1, the return value is
226 # passed through __to_boolean. I think it helps handler_guts() if we don't
227 # have multiple sets of return codes being checked for different things -drb.
232 my $config = $self->config;
234 $config->ok_tables || $config->ok_tables( $config->display_tables );
236 $config->ok_tables( { map { $_ => 1 } @{ $config->ok_tables } } )
237 if ref $config->ok_tables eq "ARRAY";
239 my $table = $self->table;
241 warn "We don't have that table ($table).\n"
242 . "Available tables are: "
243 . join( ",", @{ $config->ok_tables } )
245 and not $config->ok_tables->{$table}
246 and $self->action; # this is probably always true
248 return DECLINED unless exists $config->ok_tables->{$table};
251 if (exists $config->ok_tables->{ $self->{table} }) {
254 if ( $self->_have_default_table_view ) {
255 my $path_is_ok = $self->default_table_view($self->{path},$self->{args});
257 unless ($path_is_ok) {
258 warn "We don't have that table ($self->{table}).\n"
259 . "Available tables are: "
260 . join( ",", @{ $config->{display_tables} } )
262 and not $config->ok_tables->{ $self->{table} }
267 return DECLINED() unless $path_is_ok;
270 return DECLINED unless $self->model_class->is_public($self->action);
275 # *only* intended for translating the return code from is_applicable()
276 sub __to_boolean { $_[0] == OK ? 1 : 0 }
278 sub call_authenticate
282 # Check if we have a model class with an authenticate() to delegate to
283 return $self->model_class->authenticate($self)
284 if $self->model_class and $self->model_class->can('authenticate');
286 # Interface consistency is a Good Thing -
287 # the invocant and the argument may one day be different things
288 # (i.e. controller and request), like they are when authenticate()
289 # is called on a model class (i.e. model and request)
290 return $self->authenticate($self);
295 my ($self, $error) = @_;
297 # Check if we have a model class with an exception() to delegate to
298 if ( $self->model_class && $self->model_class->can('exception') )
300 my $status = $self->model_class->exception( $self, $error );
301 return $status if $status == OK;
304 return $self->exception($error);
307 sub default_table_view {
308 my ($self,$path,$args) = @_;
310 my $default_table_view = __PACKAGE__->_default_table_view;
311 # (path class action field)
312 my @path = $self->{path} =~ m{([^/]+)/?}g;
313 my $search_value = shift(@path);
314 if ($default_table_view->{path}) {
315 if ($default_table_view->{path} eq $search_value) {
316 $search_value = shift(@path);
322 $self->{table} = $default_table_view->{class};
323 $self->{action} = $default_table_view->{action};
324 $self->{args} = [ $search_value,@path ];
328 sub additional_data { }
330 sub authenticate { return OK }
332 sub exception { return ERROR }
338 $self->path || $self->path('frontpage');
340 my @pi = grep {length} split '/', $self->path;
342 $self->table(shift @pi);
344 $self->action( shift @pi or 'index' );
349 # like CGI::param(), but read only
352 my ($self, $key) = @_;
354 return keys %{$self->params} unless defined $key;
356 return unless exists $self->params->{$key};
358 my $val = $self->params->{$key};
360 return ref $val ? @$val : ($val) if wantarray;
362 return ref $val ? $val->[0] : $val;
365 sub get_template_root {'.'}
369 die "get_protocol is a virtual method. Do not use Maypole directly; use Apache::MVC or similar";
373 die "parse_location is a virtual method. Do not use Maypole directly; use Apache::MVC or similar";
376 sub redirect_request {
377 die "parse_location is a virtual method. Do not use Maypole directly; use Apache::MVC or similar";
380 sub redirect_internal_request {
385 die "send_output is a virtual method. Do not use Maypole directly; use Apache::MVC or similar";
388 # Session and Repeat Submission Handling
391 use Maypole::Session;
392 return Maypole::Session::generate_unique_id();
397 Maypole - MVC web application framework
401 See L<Maypole::Application>.
405 This documents the Maypole request object. See the L<Maypole::Manual>, for a
406 detailed guide to using Maypole.
408 Maypole is a Perl web application framework similar to Java's struts. It is
409 essentially completely abstracted, and so doesn't know anything about
410 how to talk to the outside world.
412 To use it, you need to create a package which represents your entire
413 application. In our example above, this is the C<BeerDB> package.
415 This needs to first use L<Maypole::Application> which will make your package
416 inherit from the appropriate platform driver such as C<Apache::MVC> or
417 C<CGI::Maypole>, and then call setup. This sets up the model classes and
418 configures your application. The default model class for Maypole uses
419 L<Class::DBI> to map a database to classes, but this can be changed by altering
420 configuration. (B<Before> calling setup.)
426 Returns the L<Maypole::Config> object
430 My::App->setup($data_source, $user, $password, \%attr);
432 Initialise the maypole application and model classes. Your application should
433 call this after setting configuration via L<"config">
437 You should not call this directly, but you may wish to override this to
439 application-specific initialisation.
443 Constructs a very minimal new Maypole request object.
447 Get/set the Maypole::View object
451 sub My::App::debug {1}
453 Returns the debugging flag. Override this in your application class to
454 enable/disable debugging.
456 =head2 INSTANCE METHODS
458 =head3 parse_location
460 Turns the backend request (e.g. Apache::MVC, Maypole, CGI) into a
462 request. It does this by setting the C<path>, and invoking C<parse_path>
466 You should only need to define this method if you are writing a new
472 Returns the request path
476 Parses the request path and sets the C<args>, C<action> and C<table>
481 The table part of the Maypole request path
485 The action part of the Maypole request path
489 A list of remaining parts of the request path after table and action
495 A L<Maypole::Headers> object containing HTTP headers for the request
499 A L<HTTP::Headers> object that contains HTTP headers for the output
503 Turns post data and query string paramaters into a hash of C<params>.
505 You should only need to define this method if you are writing a new
511 An accessor for request parameters. It behaves similarly to CGI::param() for
512 accessing CGI parameters.
516 Returns a hash of request parameters. The source of the parameters may vary
517 depending on the Maypole backend, but they are usually populated from request
518 query string and POST data.
520 B<Note:> Where muliple values of a parameter were supplied, the
523 will be an array reference.
525 =head3 get_template_root
527 Implementation-specific path to template root.
529 You should only need to define this method if you are writing a new
531 backend. Otherwise, see L<Maypole::Config/"template_root">
535 You should only need to define this method if you are writing a new
536 Maypole backend. It should return something that looks like an Apache
537 or CGI request object, it defaults to blank.
539 =head3 default_table_view
543 Returns a Maypole::Constant to indicate whether the request is valid.
545 The default implementation checks that C<$self-E<gt>table> is publicly
547 and that the model class is configured to handle the C<$self-E<gt>action>
551 Returns a Maypole::Constant to indicate whether the user is
555 The default implementation returns C<OK>
559 Returns the perl package name that will serve as the model for the
560 request. It corresponds to the request C<table> attribute.
562 =head3 additional_data
564 Called before the model processes the request, this method gives you a
566 to do some processing for each request, for example, manipulating
571 Get/set a list of model objects. The objects will be accessible in the
575 If the first item in C<$self-E<gt>args> can be C<retrieve()>d by the model
577 it will be removed from C<args> and the retrieved object will be added
579 C<objects> list. See L<Maypole::Model> for more information.
583 $self->template_args->{foo} = 'bar';
585 Get/set a hash of template variables.
589 A place to put custom application data. Not used by Maypole itself.
593 Get/set the template to be used by the view. By default, it returns
598 This method is called if any exceptions are raised during the
601 model/view processing. It should accept the exception as a parameter and
603 a Maypole::Constant to indicate whether the request should continue to
609 Get/set a request error
613 Get/set the response output. This is usually populated by the view
615 can skip view processing by setting the C<output>.
617 =head3 document_encoding
619 Get/set the output encoding. Default: utf-8.
623 Get/set the output content type. Default: text/html
627 Sends the output and additional headers to the user.
629 =head3 call_authenticate
631 This method first checks if the relevant model class
632 can authenticate the user, or falls back to the default
633 authenticate method of your Maypole application.
636 =head3 call_exception
638 This model is called to catch exceptions, first after authenticate, then after
639 processing the model class, and finally to check for exceptions from the view
642 This method first checks if the relevant model class
643 can handle exceptions the user, or falls back to the default
644 exception method of your Maypole application.
646 =head3 make_random_id
648 returns a unique id for this request can be used to prevent or detect repeat
653 Returns the protocol the request was made with, i.e. https
655 =head3 redirect_request
657 Sets output headers to redirect based on the arguments provided
659 Accepts either a single argument of the full url to redirect to, or a hash of named parameters :
661 $r->redirect_request('http://www.example.com/path');
665 $r->redirect_request(protocol=>'https', domain=>'www.example.com', path=>'/path/file?arguments', status=>'302', url=>'..');
667 The named parameters are protocol, domain, path, status and url
669 Only 1 named parameter is required but other than url, they can be combined as required and current values (from the request) will be used in place of any missing arguments. The url argument must be a full url including protocol and can only be combined with status.
673 This method sets up the class if it's not done yet, sets some
674 defaults and leaves the dirty work to handler_guts.
678 This is the main request handling method and calls various methods to handle the request/response
679 and defines the workflow within Maypole.
681 Currently undocumented and liable to be refactored without warning.
685 There's more documentation, examples, and a information on our mailing lists
686 at the Maypole web site:
688 L<http://maypole.perl.org/>
690 L<Maypole::Application>, L<Apache::MVC>, L<CGI::Maypole>.
694 Maypole is currently maintained by Simon Flack C<simonflk#cpan.org>
696 =head1 AUTHOR EMERITUS
698 Simon Cozens, C<simon#cpan.org>
700 Sebastian Riedel, C<sri#oook.de> maintained Maypole from 1.99_01 to 2.04
704 Sebastian Riedel, Danijel Milicevic, Dave Slack, Jesse Sheidlower, Jody Belka,
705 Marcus Ramberg, Mickael Joanne, Randal Schwartz, Simon Flack, Steve Simms,
706 Veljko Vidovic and all the others who've helped.
710 You may distribute this code under the same terms as Perl itself.