Koha/Plugins.pm

   1 package Koha::Plugins;
   2
   3 # Copyright 2012 Kyle Hall
   4 #
   5 # This file is part of Koha.
   6 #
   7 # Koha is free software; you can redistribute it and/or modify it
   8 # under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # Koha is distributed in the hope that it will be useful, but
  13 # WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with Koha; if not, see <http://www.gnu.org/licenses>.
  19
  20 use Modern::Perl;
  21
  22 use Class::Inspector;
  23 use List::MoreUtils qw(any);
  24 use Module::Load::Conditional qw(can_load);
  25 use Module::Load qw(load);
  26 use Module::Pluggable search_path => ['Koha::Plugin'], except => qr/::Edifact(|::Line|::Message|::Order|::Segment|::Transport)$/;
  27
  28 use C4::Context;
  29 use C4::Output;
  30 use Koha::Plugins::Methods;
  31
  32 BEGIN {
  33     my $pluginsdir = C4::Context->config("pluginsdir");
  34     my @pluginsdir = ref($pluginsdir) eq 'ARRAY' ? @$pluginsdir : $pluginsdir;
  35     push( @INC, @pluginsdir );
  36     pop @INC if $INC[-1] eq '.';
  37 }
  38
  39 =head1 NAME
  40
  41 Koha::Plugins - Module for loading and managing plugins.
  42
  43 =cut
  44
  45 sub new {
  46     my ( $class, $args ) = @_;
  47
  48     return unless ( C4::Context->config("enable_plugins") || $args->{'enable_plugins'} );
  49
  50     $args->{'pluginsdir'} = C4::Context->config("pluginsdir");
  51
  52     return bless( $args, $class );
  53 }
  54
  55 =head2 call
  56
  57 Calls a plugin method for all enabled plugins
  58
  59     @responses = Koha::Plugins->call($method, @args)
  60
  61 =cut
  62
  63 sub call {
  64     my ($class, $method, @args) = @_;
  65
  66     if (C4::Context->config('enable_plugins')) {
  67         my @plugins = $class->new({ enable_plugins => 1 })->GetPlugins({ method => $method });
  68         my @responses;
  69         @plugins = grep { $_->can($method) } @plugins;
  70         foreach my $plugin (@plugins) {
  71             my $response = eval { $plugin->$method(@args) };
  72             if ($@) {
  73                 warn sprintf("Plugin error (%s): %s", $plugin->get_metadata->{name}, $@);
  74                 next;
  75             }
  76
  77             push @responses, $response;
  78         }
  79
  80         return @responses;
  81     }
  82 }
  83
  84 =head2 GetPlugins
  85
  86 This will return a list of all available plugins, optionally limited by
  87 method or metadata value.
  88
  89     my @plugins = Koha::Plugins::GetPlugins({
  90         method => 'some_method',
  91         metadata => { some_key => 'some_value' },
  92     });
  93
  94 The method and metadata parameters are optional.
  95 Available methods currently are: 'report', 'tool', 'to_marc', 'edifact'.
  96 If you pass multiple keys in the metadata hash, all keys must match.
  97
  98 =cut
  99
 100 sub GetPlugins {
 101     my ( $self, $params ) = @_;
 102
 103     my $method       = $params->{method};
 104     my $req_metadata = $params->{metadata} // {};
 105
 106     my $filter = ( $method ) ? { plugin_method => $method } : undef;
 107
 108     my $plugin_classes = Koha::Plugins::Methods->search(
 109         $filter,
 110         {   columns  => 'plugin_class',
 111             distinct => 1
 112         }
 113     )->_resultset->get_column('plugin_class');
 114
 115     my @plugins;
 116
 117     # Loop through all plugins that implement at least a method
 118     while ( my $plugin_class = $plugin_classes->next ) {
 119
 120         load $plugin_class;
 121         my $plugin = $plugin_class->new({
 122             enable_plugins => $self->{'enable_plugins'}
 123                 # loads even if plugins are disabled
 124                 # FIXME: is this for testing without bothering to mock config?
 125         });
 126
 127         next unless $plugin->is_enabled or
 128                     defined($params->{all}) && $params->{all};
 129
 130         # filter the plugin out by metadata
 131         my $plugin_metadata = $plugin->get_metadata;
 132         next
 133             if $plugin_metadata
 134             and %$req_metadata
 135             and any { !$plugin_metadata->{$_} || $plugin_metadata->{$_} ne $req_metadata->{$_} } keys %$req_metadata;
 136
 137         push @plugins, $plugin;
 138
 139     }
 140
 141     return @plugins;
 142 }
 143
 144 =head2 InstallPlugins
 145
 146 Koha::Plugins::InstallPlugins()
 147
 148 This method iterates through all plugins physically present on a system.
 149 For each plugin module found, it will test that the plugin can be loaded,
 150 and if it can, will store its available methods in the plugin_methods table.
 151
 152 NOTE: We re-load all plugins here as a protective measure in case someone
 153 has removed a plugin directly from the system without using the UI
 154
 155 =cut
 156
 157 sub InstallPlugins {
 158     my ( $self, $params ) = @_;
 159
 160     my @plugin_classes = $self->plugins();
 161     my @plugins;
 162
 163     foreach my $plugin_class (@plugin_classes) {
 164         if ( can_load( modules => { $plugin_class => undef }, nocache => 1 ) ) {
 165             next unless $plugin_class->isa('Koha::Plugins::Base');
 166
 167             my $plugin = $plugin_class->new({ enable_plugins => $self->{'enable_plugins'} });
 168
 169             Koha::Plugins::Methods->search({ plugin_class => $plugin_class })->delete();
 170
 171             foreach my $method ( @{ Class::Inspector->methods( $plugin_class, 'public' ) } ) {
 172                 Koha::Plugins::Method->new(
 173                     {
 174                         plugin_class  => $plugin_class,
 175                         plugin_method => $method,
 176                     }
 177                 )->store();
 178             }
 179
 180             push @plugins, $plugin;
 181         } else {
 182             my $error = $Module::Load::Conditional::ERROR;
 183             # Do not warn the error if the plugin has been uninstalled
 184             warn $error unless $error =~ m|^Could not find or check module '$plugin_class'|;
 185         }
 186     }
 187     return @plugins;
 188 }
 189
 190 1;
 191 __END__
 192
 193 =head1 AVAILABLE HOOKS
 194
 195 =head2 after_hold_create
 196
 197 =head3 Parameters
 198
 199 =over
 200
 201 =item * C<$hold> - A Koha::Hold object that has just been inserted in database
 202
 203 =back
 204
 205 =head3 Return value
 206
 207 None
 208
 209 =head3 Example
 210
 211     sub after_hold_create {
 212         my ($self, $hold) = @_;
 213
 214         warn "New hold for borrower " . $hold->borrower->borrowernumber;
 215     }
 216
 217 =head1 AUTHOR
 218
 219 Kyle M Hall <kyle.m.hall@gmail.com>
 220
 221 =cut