Koha/Plugins/Base.pm

   1 package Koha::Plugins::Base;
   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 Module::Pluggable require => 1;
  23 use Cwd qw(abs_path);
  24 use List::Util qw(max);
  25
  26 use base qw{Module::Bundled::Files};
  27
  28 use C4::Context;
  29 use C4::Output qw(output_with_http_headers output_html_with_http_headers);
  30
  31 =head1 NAME
  32
  33 Koha::Plugins::Base - Base Module for plugins
  34
  35 =cut
  36
  37 sub new {
  38     my ( $class, $args ) = @_;
  39
  40     return unless ( C4::Context->config("enable_plugins") || $args->{'enable_plugins'} );
  41
  42     $args->{'class'} = $class;
  43     $args->{'template'} = Template->new( { ABSOLUTE => 1, ENCODING => 'UTF-8' } );
  44
  45     my $self = bless( $args, $class );
  46
  47     my $plugin_version = $self->get_metadata->{version};
  48     my $database_version = $self->retrieve_data('__INSTALLED_VERSION__') || 0;
  49
  50     ## Run the installation method if it exists and hasn't been run before
  51     if ( $self->can('install') && !$self->retrieve_data('__INSTALLED__') ) {
  52         if ( $self->install() ) {
  53             $self->store_data( { '__INSTALLED__' => 1 } );
  54             if ( my $version = $plugin_version ) {
  55                 $self->store_data({ '__INSTALLED_VERSION__' => $version });
  56             }
  57         } else {
  58             warn "Plugin $class failed during installation!";
  59         }
  60     } elsif ( $self->can('upgrade') ) {
  61         if ( _version_compare( $plugin_version, $database_version ) == 1 ) {
  62             if ( $self->upgrade() ) {
  63                 $self->store_data({ '__INSTALLED_VERSION__' => $plugin_version });
  64             } else {
  65                 warn "Plugin $class failed during upgrade!";
  66             }
  67         }
  68     } elsif ( $plugin_version ne $database_version ) {
  69         $self->store_data({ '__INSTALLED_VERSION__' => $plugin_version });
  70     }
  71
  72     return $self;
  73 }
  74
  75 =head2 store_data
  76
  77 store_data allows a plugin to store key value pairs in the database for future use.
  78
  79 usage: $self->store_data({ param1 => 'param1val', param2 => 'param2value' })
  80
  81 =cut
  82
  83 sub store_data {
  84     my ( $self, $data ) = @_;
  85
  86     my $dbh = C4::Context->dbh;
  87     my $sql = "REPLACE INTO plugin_data SET plugin_class = ?, plugin_key = ?, plugin_value = ?";
  88     my $sth = $dbh->prepare($sql);
  89
  90     foreach my $key ( keys %$data ) {
  91         $sth->execute( $self->{'class'}, $key, $data->{$key} );
  92     }
  93 }
  94
  95 =head2 retrieve_data
  96
  97 retrieve_data allows a plugin to read the values that were previously saved with store_data
  98
  99 usage: my $value = $self->retrieve_data( $key );
 100
 101 =cut
 102
 103 sub retrieve_data {
 104     my ( $self, $key ) = @_;
 105
 106     my $dbh = C4::Context->dbh;
 107     my $sql = "SELECT plugin_value FROM plugin_data WHERE plugin_class = ? AND plugin_key = ?";
 108     my $sth = $dbh->prepare($sql);
 109     $sth->execute( $self->{'class'}, $key );
 110     my $row = $sth->fetchrow_hashref();
 111
 112     return $row->{'plugin_value'};
 113 }
 114
 115 =head2 get_template
 116
 117 get_template returns a Template object. Eventually this will probably be calling
 118 C4:Template, but at the moment, it does not.
 119
 120 =cut
 121
 122 sub get_template {
 123     my ( $self, $args ) = @_;
 124
 125     require C4::Auth;
 126
 127     my $template_name = $args->{'file'} // '';
 128     # if not absolute, call mbf_path, which dies if file does not exist
 129     $template_name = $self->mbf_path( $template_name )
 130         if $template_name !~ m/^\//;
 131     my ( $template, $loggedinuser, $cookie ) = C4::Auth::get_template_and_user(
 132         {   template_name   => $template_name,
 133             query           => $self->{'cgi'},
 134             type            => "intranet",
 135             authnotrequired => 1,
 136         }
 137     );
 138
 139     $template->param(
 140         CLASS       => $self->{'class'},
 141         METHOD      => scalar $self->{'cgi'}->param('method'),
 142         PLUGIN_PATH => $self->get_plugin_http_path(),
 143     );
 144
 145     return $template;
 146 }
 147
 148 sub get_metadata {
 149     my ( $self, $args ) = @_;
 150
 151     return $self->{'metadata'};
 152 }
 153
 154 =head2 get_qualified_table_name
 155
 156 To avoid naming conflict, each plugins tables should use a fully qualified namespace.
 157 To avoid hardcoding and make plugins more flexible, this method will return the proper
 158 fully qualified table name.
 159
 160 usage: my $table = $self->get_qualified_table_name( 'myTable' );
 161
 162 =cut
 163
 164 sub get_qualified_table_name {
 165     my ( $self, $table_name ) = @_;
 166
 167     return lc( join( '_', split( '::', $self->{'class'} ), $table_name ) );
 168 }
 169
 170 =head2 get_plugin_http_path
 171
 172 To access a plugin's own resources ( images, js files, css files, etc... )
 173 a plugin will need to know what path to use in the template files. This
 174 method returns that path.
 175
 176 usage: my $path = $self->get_plugin_http_path();
 177
 178 =cut
 179
 180 sub get_plugin_http_path {
 181     my ($self) = @_;
 182
 183     return "/plugin/" . join( '/', split( '::', $self->{'class'} ) );
 184 }
 185
 186 =head2 go_home
 187
 188    go_home is a quick redirect to the Koha plugins home page
 189
 190 =cut
 191
 192 sub go_home {
 193     my ( $self, $params ) = @_;
 194
 195     print $self->{'cgi'}->redirect("/cgi-bin/koha/plugins/plugins-home.pl");
 196 }
 197
 198 =head2 output_html
 199
 200     $self->output_html( $data, $status, $extra_options );
 201
 202 Outputs $data setting the right headers for HTML content.
 203
 204 Note: this is a wrapper function for C4::Output::output_with_http_headers
 205
 206 =cut
 207
 208 sub output_html {
 209     my ( $self, $data, $status, $extra_options ) = @_;
 210     output_with_http_headers( $self->{cgi}, undef, $data, 'html', $status, $extra_options );
 211 }
 212
 213 =head2 output
 214
 215    $self->output( $data, $content_type[, $status[, $extra_options]]);
 216
 217 Outputs $data with the appropriate HTTP headers,
 218 the authentication cookie and a Content-Type specified in
 219 $content_type.
 220
 221 $content_type is one of the following: 'html', 'js', 'json', 'xml', 'rss', or 'atom'.
 222
 223 $status is an HTTP status message, like '403 Authentication Required'. It defaults to '200 OK'.
 224
 225 $extra_options is hashref.  If the key 'force_no_caching' is present and has
 226 a true value, the HTTP headers include directives to force there to be no
 227 caching whatsoever.
 228
 229 Note: this is a wrapper function for C4::Output::output_with_http_headers
 230
 231 =cut
 232
 233 sub output {
 234     my ( $self, $data, $content_type, $status, $extra_options ) = @_;
 235     output_with_http_headers( $self->{cgi}, undef, $data, $content_type, $status, $extra_options );
 236 }
 237
 238 =head2 _version_compare
 239
 240 Utility method to compare two version numbers.
 241 Returns 1 if the first argument is the higher version
 242 Returns -1 if the first argument is the lower version
 243 Returns 0 if both versions are equal
 244
 245 if ( _version_compare( '2.6.26', '2.6.0' ) == 1 ) {
 246     print "2.6.26 is greater than 2.6.0\n";
 247 }
 248
 249 =cut
 250
 251 sub _version_compare {
 252     my $ver1 = shift || 0;
 253     my $ver2 = shift || 0;
 254
 255     my @v1 = split /[.+:~-]/, $ver1;
 256     my @v2 = split /[.+:~-]/, $ver2;
 257
 258     for ( my $i = 0 ; $i < max( scalar(@v1), scalar(@v2) ) ; $i++ ) {
 259
 260         # Add missing version parts if one string is shorter than the other
 261         # i.e. 0 should be lt 0.2.1 and not equal, so we append .0
 262         # 0.0.0 <=> 0.2.1 = -1
 263         push( @v1, 0 ) unless defined( $v1[$i] );
 264         push( @v2, 0 ) unless defined( $v2[$i] );
 265         if ( int( $v1[$i] ) > int( $v2[$i] ) ) {
 266             return 1;
 267         }
 268         elsif ( int( $v1[$i] ) < int( $v2[$i] ) ) {
 269             return -1;
 270         }
 271     }
 272     return 0;
 273 }
 274
 275 1;
 276 __END__
 277
 278 =head1 AUTHOR
 279
 280 Kyle M Hall <kyle.m.hall@gmail.com>
 281
 282 =cut