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Dancer::Plugin(3pm) User Contributed Perl Documentation Dancer::Plugin(3pm)

Dancer::Plugin - helper for writing Dancer plugins

version 1.3521

  package Dancer::Plugin::LinkBlocker;
  use Dancer ':syntax';
  use Dancer::Plugin;
  register block_links_from => sub {
    my $conf = plugin_setting();
    my $re = join ('|', @{$conf->{hosts}});
    before sub {
        if (request->referer && request->referer =~ /$re/) {
            status 403 || $conf->{http_code};
        }
    };
  };
  register_plugin;
  1;

And in your application:

    package My::Webapp;
    
    use Dancer ':syntax';
    use Dancer::Plugin::LinkBlocker;
    block_links_from; # this is exported by the plugin

Create plugins for Dancer

You can extend Dancer by writing your own Plugin.

A plugin is a module that exports a bunch of symbols to the current namespace (the caller will see all the symbols defined via "register").

Note that you have to "use" the plugin wherever you want to use its symbols. For instance, if you have Webapp::App1 and Webapp::App2, both loaded from your main application, they both need to "use FooPlugin" if they want to use the symbols exported by "FooPlugin".

METHODS

Lets you define a keyword that will be exported by the plugin. 

    register my_symbol_to_export => sub {
        # ... some code 
    };
A Dancer plugin must end with this statement. This lets the plugin register all the symbols define with "register" as exported symbols (via the Exporter module).

A Dancer plugin inherits from Dancer::Plugin and Exporter transparently.

Allows a plugin to declare a list of supported hooks. Any hook declared like so can be executed by the plugin with "execute_hooks". 

    register_hook 'foo'; 
    register_hook 'foo', 'bar', 'baz';
Allows a plugin to execute the hooks attached at the given position 

    execute_hooks 'some_hook';

The hook must have been registered by the plugin first, with "register_hook".

Configuration for plugin should be structured like this in the config.yml of the application: 

  plugins:
    plugin_name:
      key: value

If "plugin_setting" is called inside a plugin, the appropriate configuration will be returned. The "plugin_name" should be the name of the package, or, if the plugin name is under the Dancer::Plugin:: namespace (which is recommended), the remaining part of the plugin name.

Enclose the remaining part in quotes if it contains ::, e.g. for Dancer::Plugin::Foo::Bar, use:

  plugins:
    "Foo::Bar":
      key: value
To easy migration and interoperability between Dancer 1 and Dancer 2 you can use this method to obtain the arguments or parameters passed to a plugin-defined keyword. Although not relevant for Dancer 1 only, or Dancer 2 only, plugins, it is useful for universal plugins. 

  register foo => sub {
     my ($self, @args) = plugin_args(@_);
     ...
  }

Note that Dancer 1 will return undef as the object reference.

This module has been written by Alexis Sukrieh and others.

This module is free software and is published under the same terms as Perl itself.

Dancer Core Developers

This software is copyright (c) 2010 by Alexis Sukrieh.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

2023-02-10 perl v5.36.0