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 GetPlugins
  56
  57 This will return a list of all available plugins, optionally limited by
  58 method or metadata value.
  59
  60     my @plugins = Koha::Plugins::GetPlugins({
  61         method => 'some_method',
  62         metadata => { some_key => 'some_value' },
  63     });
  64
  65 The method and metadata parameters are optional.
  66 Available methods currently are: 'report', 'tool', 'to_marc', 'edifact'.
  67 If you pass multiple keys in the metadata hash, all keys must match.
  68
  69 =cut
  70
  71 sub GetPlugins {
  72     my ( $self, $params ) = @_;
  73
  74     my $method       = $params->{method};
  75     my $req_metadata = $params->{metadata} // {};
  76
  77     my $filter = ( $method ) ? { plugin_method => $method } : undef;
  78
  79     my $plugin_classes = Koha::Plugins::Methods->search(
  80         $filter,
  81         {   columns  => 'plugin_class',
  82             distinct => 1
  83         }
  84     )->_resultset->get_column('plugin_class');
  85
  86     my @plugins;
  87
  88     # Loop through all plugins that implement at least a method
  89     while ( my $plugin_class = $plugin_classes->next ) {
  90
  91         load $plugin_class;
  92         my $plugin = $plugin_class->new({
  93             enable_plugins => $self->{'enable_plugins'}
  94                 # loads even if plugins are disabled
  95                 # FIXME: is this for testing without bothering to mock config?
  96         });
  97
  98         next unless $plugin->is_enabled or
  99                     defined($params->{all}) && $params->{all};
 100
 101         # filter the plugin out by metadata
 102         my $plugin_metadata = $plugin->get_metadata;
 103         next
 104             if $plugin_metadata
 105             and %$req_metadata
 106             and any { !$plugin_metadata->{$_} || $plugin_metadata->{$_} ne $req_metadata->{$_} } keys %$req_metadata;
 107
 108         push @plugins, $plugin;
 109
 110     }
 111
 112     return @plugins;
 113 }
 114
 115 =head2 InstallPlugins
 116
 117 Koha::Plugins::InstallPlugins()
 118
 119 This method iterates through all plugins physically present on a system.
 120 For each plugin module found, it will test that the plugin can be loaded,
 121 and if it can, will store its available methods in the plugin_methods table.
 122
 123 NOTE: We re-load all plugins here as a protective measure in case someone
 124 has removed a plugin directly from the system without using the UI
 125
 126 =cut
 127
 128 sub InstallPlugins {
 129     my ( $self, $params ) = @_;
 130
 131     my @plugin_classes = $self->plugins();
 132     my @plugins;
 133
 134     foreach my $plugin_class (@plugin_classes) {
 135         if ( can_load( modules => { $plugin_class => undef }, nocache => 1 ) ) {
 136             next unless $plugin_class->isa('Koha::Plugins::Base');
 137
 138             my $plugin = $plugin_class->new({ enable_plugins => $self->{'enable_plugins'} });
 139
 140             Koha::Plugins::Methods->search({ plugin_class => $plugin_class })->delete();
 141
 142             foreach my $method ( @{ Class::Inspector->methods( $plugin_class, 'public' ) } ) {
 143                 Koha::Plugins::Method->new(
 144                     {
 145                         plugin_class  => $plugin_class,
 146                         plugin_method => $method,
 147                     }
 148                 )->store();
 149             }
 150
 151             push @plugins, $plugin;
 152         } else {
 153             my $error = $Module::Load::Conditional::ERROR;
 154             # Do not warn the error if the plugin has been uninstalled
 155             warn $error unless $error =~ m|^Could not find or check module '$plugin_class'|;
 156         }
 157     }
 158     return @plugins;
 159 }
 160
 161 1;
 162 __END__
 163
 164 =head1 AUTHOR
 165
 166 Kyle M Hall <kyle.m.hall@gmail.com>
 167
 168 =cut