C4/Context.pm

   1 package C4::Context;
   2 # Copyright 2002 Katipo Communications
   3 #
   4 # This file is part of Koha.
   5 #
   6 # Koha is free software; you can redistribute it and/or modify it
   7 # under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # Koha is distributed in the hope that it will be useful, but
  12 # WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with Koha; if not, see <http://www.gnu.org/licenses>.
  18
  19 use strict;
  20 use warnings;
  21 use vars qw($VERSION $AUTOLOAD $context @context_stack $servers $memcached $ismemcached);
  22 BEGIN {
  23         if ($ENV{'HTTP_USER_AGENT'})    {
  24                 require CGI::Carp;
  25         # FIXME for future reference, CGI::Carp doc says
  26         #  "Note that fatalsToBrowser does not work with mod_perl version 2.0 and higher."
  27                 import CGI::Carp qw(fatalsToBrowser);
  28                         sub handle_errors {
  29                             my $msg = shift;
  30                             my $debug_level;
  31                             eval {C4::Context->dbh();};
  32                             if ($@){
  33                                 $debug_level = 1;
  34                             }
  35                             else {
  36                                 $debug_level =  C4::Context->preference("DebugLevel");
  37                             }
  38
  39                 print q(<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  40                             "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  41                        <html lang="en" xml:lang="en"  xmlns="http://www.w3.org/1999/xhtml">
  42                        <head><title>Koha Error</title></head>
  43                        <body>
  44                 );
  45                                 if ($debug_level eq "2"){
  46                                         # debug 2 , print extra info too.
  47                                         my %versions = get_versions();
  48
  49                 # a little example table with various version info";
  50                                         print "
  51                                                 <h1>Koha error</h1>
  52                                                 <p>The following fatal error has occurred:</p>
  53                         <pre><code>$msg</code></pre>
  54                                                 <table>
  55                                                 <tr><th>Apache</th><td>  $versions{apacheVersion}</td></tr>
  56                                                 <tr><th>Koha</th><td>    $versions{kohaVersion}</td></tr>
  57                                                 <tr><th>Koha DB</th><td> $versions{kohaDbVersion}</td></tr>
  58                                                 <tr><th>MySQL</th><td>   $versions{mysqlVersion}</td></tr>
  59                                                 <tr><th>OS</th><td>      $versions{osVersion}</td></tr>
  60                                                 <tr><th>Perl</th><td>    $versions{perlVersion}</td></tr>
  61                                                 </table>";
  62
  63                                 } elsif ($debug_level eq "1"){
  64                                         print "
  65                                                 <h1>Koha error</h1>
  66                                                 <p>The following fatal error has occurred:</p>
  67                         <pre><code>$msg</code></pre>";
  68                                 } else {
  69                                         print "<p>production mode - trapped fatal error</p>";
  70                                 }
  71                 print "</body></html>";
  72                         }
  73                 #CGI::Carp::set_message(\&handle_errors);
  74                 ## give a stack backtrace if KOHA_BACKTRACES is set
  75                 ## can't rely on DebugLevel for this, as we're not yet connected
  76                 if ($ENV{KOHA_BACKTRACES}) {
  77                         $main::SIG{__DIE__} = \&CGI::Carp::confess;
  78                 }
  79     }   # else there is no browser to send fatals to!
  80
  81     # Check if there are memcached servers set
  82     $servers = $ENV{'MEMCACHED_SERVERS'};
  83     if ($servers) {
  84         # Load required libraries and create the memcached object
  85         require Cache::Memcached;
  86         $memcached = Cache::Memcached->new({
  87         servers => [ $servers ],
  88         debug   => 0,
  89         compress_threshold => 10_000,
  90         expire_time => 600,
  91         namespace => $ENV{'MEMCACHED_NAMESPACE'} || 'koha'
  92     });
  93         # Verify memcached available (set a variable and test the output)
  94     $ismemcached = $memcached->set('ismemcached','1');
  95     }
  96
  97     $VERSION = '3.07.00.049';
  98 }
  99
 100 use DBIx::Connector;
 101 use Encode;
 102 use ZOOM;
 103 use XML::Simple;
 104 use POSIX ();
 105 use DateTime::TimeZone;
 106 use Module::Load::Conditional qw(can_load);
 107 use Carp;
 108
 109 use C4::Boolean;
 110 use C4::Debug;
 111 use Koha;
 112 use Koha::Config::SysPrefs;
 113
 114 =head1 NAME
 115
 116 C4::Context - Maintain and manipulate the context of a Koha script
 117
 118 =head1 SYNOPSIS
 119
 120   use C4::Context;
 121
 122   use C4::Context("/path/to/koha-conf.xml");
 123
 124   $config_value = C4::Context->config("config_variable");
 125
 126   $koha_preference = C4::Context->preference("preference");
 127
 128   $db_handle = C4::Context->dbh;
 129
 130   $Zconn = C4::Context->Zconn;
 131
 132   $stopwordhash = C4::Context->stopwords;
 133
 134 =head1 DESCRIPTION
 135
 136 When a Koha script runs, it makes use of a certain number of things:
 137 configuration settings in F</etc/koha/koha-conf.xml>, a connection to the Koha
 138 databases, and so forth. These things make up the I<context> in which
 139 the script runs.
 140
 141 This module takes care of setting up the context for a script:
 142 figuring out which configuration file to load, and loading it, opening
 143 a connection to the right database, and so forth.
 144
 145 Most scripts will only use one context. They can simply have
 146
 147   use C4::Context;
 148
 149 at the top.
 150
 151 Other scripts may need to use several contexts. For instance, if a
 152 library has two databases, one for a certain collection, and the other
 153 for everything else, it might be necessary for a script to use two
 154 different contexts to search both databases. Such scripts should use
 155 the C<&set_context> and C<&restore_context> functions, below.
 156
 157 By default, C4::Context reads the configuration from
 158 F</etc/koha/koha-conf.xml>. This may be overridden by setting the C<$KOHA_CONF>
 159 environment variable to the pathname of a configuration file to use.
 160
 161 =head1 METHODS
 162
 163 =cut
 164
 165 #'
 166 # In addition to what is said in the POD above, a Context object is a
 167 # reference-to-hash with the following fields:
 168 #
 169 # config
 170 #    A reference-to-hash whose keys and values are the
 171 #    configuration variables and values specified in the config
 172 #    file (/etc/koha/koha-conf.xml).
 173 # dbh
 174 #    A handle to the appropriate database for this context.
 175 # dbh_stack
 176 #    Used by &set_dbh and &restore_dbh to hold other database
 177 #    handles for this context.
 178 # Zconn
 179 #     A connection object for the Zebra server
 180
 181 # Koha's main configuration file koha-conf.xml
 182 # is searched for according to this priority list:
 183 #
 184 # 1. Path supplied via use C4::Context '/path/to/koha-conf.xml'
 185 # 2. Path supplied in KOHA_CONF environment variable.
 186 # 3. Path supplied in INSTALLED_CONFIG_FNAME, as long
 187 #    as value has changed from its default of
 188 #    '__KOHA_CONF_DIR__/koha-conf.xml', as happens
 189 #    when Koha is installed in 'standard' or 'single'
 190 #    mode.
 191 # 4. Path supplied in CONFIG_FNAME.
 192 #
 193 # The first entry that refers to a readable file is used.
 194
 195 use constant CONFIG_FNAME => "/etc/koha/koha-conf.xml";
 196                 # Default config file, if none is specified
 197
 198 my $INSTALLED_CONFIG_FNAME = '__KOHA_CONF_DIR__/koha-conf.xml';
 199                 # path to config file set by installer
 200                 # __KOHA_CONF_DIR__ is set by rewrite-confg.PL
 201                 # when Koha is installed in 'standard' or 'single'
 202                 # mode.  If Koha was installed in 'dev' mode,
 203                 # __KOHA_CONF_DIR__ is *not* rewritten; instead
 204                 # developers should set the KOHA_CONF environment variable
 205
 206 $context = undef;        # Initially, no context is set
 207 @context_stack = ();        # Initially, no saved contexts
 208
 209
 210 =head2 read_config_file
 211
 212 Reads the specified Koha config file.
 213
 214 Returns an object containing the configuration variables. The object's
 215 structure is a bit complex to the uninitiated ... take a look at the
 216 koha-conf.xml file as well as the XML::Simple documentation for details. Or,
 217 here are a few examples that may give you what you need:
 218
 219 The simple elements nested within the <config> element:
 220
 221     my $pass = $koha->{'config'}->{'pass'};
 222
 223 The <listen> elements:
 224
 225     my $listen = $koha->{'listen'}->{'biblioserver'}->{'content'};
 226
 227 The elements nested within the <server> element:
 228
 229     my $ccl2rpn = $koha->{'server'}->{'biblioserver'}->{'cql2rpn'};
 230
 231 Returns undef in case of error.
 232
 233 =cut
 234
 235 sub read_config_file {          # Pass argument naming config file to read
 236     my $koha = XMLin(shift, keyattr => ['id'], forcearray => ['listen', 'server', 'serverinfo'], suppressempty => '');
 237
 238     if ($ismemcached) {
 239       $memcached->set('kohaconf',$koha);
 240     }
 241
 242     return $koha;                       # Return value: ref-to-hash holding the configuration
 243 }
 244
 245 =head2 ismemcached
 246
 247 Returns the value of the $ismemcached variable (0/1)
 248
 249 =cut
 250
 251 sub ismemcached {
 252     return $ismemcached;
 253 }
 254
 255 =head2 memcached
 256
 257 If $ismemcached is true, returns the $memcache variable.
 258 Returns undef otherwise
 259
 260 =cut
 261
 262 sub memcached {
 263     if ($ismemcached) {
 264       return $memcached;
 265     } else {
 266       return;
 267     }
 268 }
 269
 270 =head2 db_scheme2dbi
 271
 272     my $dbd_driver_name = C4::Context::db_schema2dbi($scheme);
 273
 274 This routines translates a database type to part of the name
 275 of the appropriate DBD driver to use when establishing a new
 276 database connection.  It recognizes 'mysql' and 'Pg'; if any
 277 other scheme is supplied it defaults to 'mysql'.
 278
 279 =cut
 280
 281 sub db_scheme2dbi {
 282     my $scheme = shift // '';
 283     return $scheme eq 'Pg' ? $scheme : 'mysql';
 284 }
 285
 286 sub import {
 287     # Create the default context ($C4::Context::Context)
 288     # the first time the module is called
 289     # (a config file can be optionaly passed)
 290
 291     # default context already exists?
 292     return if $context;
 293
 294     # no ? so load it!
 295     my ($pkg,$config_file) = @_ ;
 296     my $new_ctx = __PACKAGE__->new($config_file);
 297     return unless $new_ctx;
 298
 299     # if successfully loaded, use it by default
 300     $new_ctx->set_context;
 301     1;
 302 }
 303
 304 =head2 new
 305
 306   $context = new C4::Context;
 307   $context = new C4::Context("/path/to/koha-conf.xml");
 308
 309 Allocates a new context. Initializes the context from the specified
 310 file, which defaults to either the file given by the C<$KOHA_CONF>
 311 environment variable, or F</etc/koha/koha-conf.xml>.
 312
 313 It saves the koha-conf.xml values in the declared memcached server(s)
 314 if currently available and uses those values until them expire and
 315 re-reads them.
 316
 317 C<&new> does not set this context as the new default context; for
 318 that, use C<&set_context>.
 319
 320 =cut
 321
 322 #'
 323 # Revision History:
 324 # 2004-08-10 A. Tarallo: Added check if the conf file is not empty
 325 sub new {
 326     my $class = shift;
 327     my $conf_fname = shift;        # Config file to load
 328     my $self = {};
 329
 330     # check that the specified config file exists and is not empty
 331     undef $conf_fname unless
 332         (defined $conf_fname && -s $conf_fname);
 333     # Figure out a good config file to load if none was specified.
 334     if (!defined($conf_fname))
 335     {
 336         # If the $KOHA_CONF environment variable is set, use
 337         # that. Otherwise, use the built-in default.
 338         if (exists $ENV{"KOHA_CONF"} and $ENV{'KOHA_CONF'} and -s  $ENV{"KOHA_CONF"}) {
 339             $conf_fname = $ENV{"KOHA_CONF"};
 340         } elsif ($INSTALLED_CONFIG_FNAME !~ /__KOHA_CONF_DIR/ and -s $INSTALLED_CONFIG_FNAME) {
 341             # NOTE: be careful -- don't change __KOHA_CONF_DIR in the above
 342             # regex to anything else -- don't want installer to rewrite it
 343             $conf_fname = $INSTALLED_CONFIG_FNAME;
 344         } elsif (-s CONFIG_FNAME) {
 345             $conf_fname = CONFIG_FNAME;
 346         } else {
 347             warn "unable to locate Koha configuration file koha-conf.xml";
 348             return;
 349         }
 350     }
 351
 352     if ($ismemcached) {
 353         # retrieve from memcached
 354         $self = $memcached->get('kohaconf');
 355         if (not defined $self) {
 356             # not in memcached yet
 357             $self = read_config_file($conf_fname);
 358         }
 359     } else {
 360         # non-memcached env, read from file
 361         $self = read_config_file($conf_fname);
 362     }
 363
 364     $self->{"config_file"} = $conf_fname;
 365     warn "read_config_file($conf_fname) returned undef" if !defined($self->{"config"});
 366     return if !defined($self->{"config"});
 367
 368     $self->{"dbh"} = undef;        # Database handle
 369     $self->{"Zconn"} = undef;    # Zebra Connections
 370     $self->{"stopwords"} = undef; # stopwords list
 371     $self->{"marcfromkohafield"} = undef; # the hash with relations between koha table fields and MARC field/subfield
 372     $self->{"userenv"} = undef;        # User env
 373     $self->{"activeuser"} = undef;        # current active user
 374     $self->{"shelves"} = undef;
 375     $self->{tz} = undef; # local timezone object
 376
 377     bless $self, $class;
 378     $self->{db_driver} = db_scheme2dbi($self->config('db_scheme'));  # cache database driver
 379     return $self;
 380 }
 381
 382 =head2 set_context
 383
 384   $context = new C4::Context;
 385   $context->set_context();
 386 or
 387   set_context C4::Context $context;
 388
 389   ...
 390   restore_context C4::Context;
 391
 392 In some cases, it might be necessary for a script to use multiple
 393 contexts. C<&set_context> saves the current context on a stack, then
 394 sets the context to C<$context>, which will be used in future
 395 operations. To restore the previous context, use C<&restore_context>.
 396
 397 =cut
 398
 399 #'
 400 sub set_context
 401 {
 402     my $self = shift;
 403     my $new_context;    # The context to set
 404
 405     # Figure out whether this is a class or instance method call.
 406     #
 407     # We're going to make the assumption that control got here
 408     # through valid means, i.e., that the caller used an instance
 409     # or class method call, and that control got here through the
 410     # usual inheritance mechanisms. The caller can, of course,
 411     # break this assumption by playing silly buggers, but that's
 412     # harder to do than doing it properly, and harder to check
 413     # for.
 414     if (ref($self) eq "")
 415     {
 416         # Class method. The new context is the next argument.
 417         $new_context = shift;
 418     } else {
 419         # Instance method. The new context is $self.
 420         $new_context = $self;
 421     }
 422
 423     # Save the old context, if any, on the stack
 424     push @context_stack, $context if defined($context);
 425
 426     # Set the new context
 427     $context = $new_context;
 428 }
 429
 430 =head2 restore_context
 431
 432   &restore_context;
 433
 434 Restores the context set by C<&set_context>.
 435
 436 =cut
 437
 438 #'
 439 sub restore_context
 440 {
 441     my $self = shift;
 442
 443     if ($#context_stack < 0)
 444     {
 445         # Stack underflow.
 446         die "Context stack underflow";
 447     }
 448
 449     # Pop the old context and set it.
 450     $context = pop @context_stack;
 451
 452     # FIXME - Should this return something, like maybe the context
 453     # that was current when this was called?
 454 }
 455
 456 =head2 config
 457
 458   $value = C4::Context->config("config_variable");
 459
 460   $value = C4::Context->config_variable;
 461
 462 Returns the value of a variable specified in the configuration file
 463 from which the current context was created.
 464
 465 The second form is more compact, but of course may conflict with
 466 method names. If there is a configuration variable called "new", then
 467 C<C4::Config-E<gt>new> will not return it.
 468
 469 =cut
 470
 471 sub _common_config {
 472         my $var = shift;
 473         my $term = shift;
 474     return if !defined($context->{$term});
 475        # Presumably $self->{$term} might be
 476        # undefined if the config file given to &new
 477        # didn't exist, and the caller didn't bother
 478        # to check the return value.
 479
 480     # Return the value of the requested config variable
 481     return $context->{$term}->{$var};
 482 }
 483
 484 sub config {
 485         return _common_config($_[1],'config');
 486 }
 487 sub zebraconfig {
 488         return _common_config($_[1],'server');
 489 }
 490 sub ModZebrations {
 491         return _common_config($_[1],'serverinfo');
 492 }
 493
 494 =head2 preference
 495
 496   $sys_preference = C4::Context->preference('some_variable');
 497
 498 Looks up the value of the given system preference in the
 499 systempreferences table of the Koha database, and returns it. If the
 500 variable is not set or does not exist, undef is returned.
 501
 502 In case of an error, this may return 0.
 503
 504 Note: It is impossible to tell the difference between system
 505 preferences which do not exist, and those whose values are set to NULL
 506 with this method.
 507
 508 =cut
 509
 510 # FIXME: running this under mod_perl will require a means of
 511 # flushing the caching mechanism.
 512
 513 my %sysprefs;
 514 my $use_syspref_cache = 1;
 515
 516 sub preference {
 517     my $self = shift;
 518     my $var  = shift;    # The system preference to return
 519
 520     if ($use_syspref_cache && exists $sysprefs{lc $var}) {
 521         return $sysprefs{lc $var};
 522     }
 523
 524     my $dbh  = C4::Context->dbh or return 0;
 525
 526     my $value;
 527     if ( defined $ENV{"OVERRIDE_SYSPREF_$var"} ) {
 528         $value = $ENV{"OVERRIDE_SYSPREF_$var"};
 529     } else {
 530         my $syspref;
 531         eval { $syspref = Koha::Config::SysPrefs->find( lc $var ) };
 532         $value = $syspref ? $syspref->value() : undef;
 533     }
 534
 535     $sysprefs{lc $var} = $value;
 536     return $value;
 537 }
 538
 539 sub boolean_preference {
 540     my $self = shift;
 541     my $var = shift;        # The system preference to return
 542     my $it = preference($self, $var);
 543     return defined($it)? C4::Boolean::true_p($it): undef;
 544 }
 545
 546 =head2 enable_syspref_cache
 547
 548   C4::Context->enable_syspref_cache();
 549
 550 Enable the in-memory syspref cache used by C4::Context. This is the
 551 default behavior.
 552
 553 =cut
 554
 555 sub enable_syspref_cache {
 556     my ($self) = @_;
 557     $use_syspref_cache = 1;
 558 }
 559
 560 =head2 disable_syspref_cache
 561
 562   C4::Context->disable_syspref_cache();
 563
 564 Disable the in-memory syspref cache used by C4::Context. This should be
 565 used with Plack and other persistent environments.
 566
 567 =cut
 568
 569 sub disable_syspref_cache {
 570     my ($self) = @_;
 571     $use_syspref_cache = 0;
 572     $self->clear_syspref_cache();
 573 }
 574
 575 =head2 clear_syspref_cache
 576
 577   C4::Context->clear_syspref_cache();
 578
 579 cleans the internal cache of sysprefs. Please call this method if
 580 you update the systempreferences table. Otherwise, your new changes
 581 will not be seen by this process.
 582
 583 =cut
 584
 585 sub clear_syspref_cache {
 586     %sysprefs = ();
 587 }
 588
 589 =head2 set_preference
 590
 591   C4::Context->set_preference( $variable, $value );
 592
 593 This updates a preference's value both in the systempreferences table and in
 594 the sysprefs cache.
 595
 596 =cut
 597
 598 sub set_preference {
 599     my $self = shift;
 600     my $var = lc(shift);
 601     my $value = shift;
 602
 603     my $syspref = Koha::Config::SysPrefs->find( $var );
 604     my $type = $syspref ? $syspref->type() : undef;
 605
 606     $value = 0 if ( $type && $type eq 'YesNo' && $value eq '' );
 607
 608     # force explicit protocol on OPACBaseURL
 609     if ($var eq 'opacbaseurl' && substr($value,0,4) !~ /http/) {
 610         $value = 'http://' . $value;
 611     }
 612
 613     if ($syspref) {
 614         $syspref = $syspref->set( { value => $value } )->store();
 615     }
 616     else {
 617         $syspref = Koha::Config::SysPref->new( { variable => $var, value => $value } )->store();
 618     }
 619
 620     if ($syspref) {
 621         $sysprefs{$var} = $value;
 622     }
 623 }
 624
 625 # AUTOLOAD
 626 # This implements C4::Config->foo, and simply returns
 627 # C4::Context->config("foo"), as described in the documentation for
 628 # &config, above.
 629
 630 # FIXME - Perhaps this should be extended to check &config first, and
 631 # then &preference if that fails. OTOH, AUTOLOAD could lead to crappy
 632 # code, so it'd probably be best to delete it altogether so as not to
 633 # encourage people to use it.
 634 sub AUTOLOAD
 635 {
 636     my $self = shift;
 637
 638     $AUTOLOAD =~ s/.*:://;        # Chop off the package name,
 639                     # leaving only the function name.
 640     return $self->config($AUTOLOAD);
 641 }
 642
 643 =head2 Zconn
 644
 645   $Zconn = C4::Context->Zconn
 646
 647 Returns a connection to the Zebra database
 648
 649 C<$self>
 650
 651 C<$server> one of the servers defined in the koha-conf.xml file
 652
 653 C<$async> whether this is a asynchronous connection
 654
 655 =cut
 656
 657 sub Zconn {
 658     my ($self, $server, $async ) = @_;
 659     my $cache_key = join ('::', (map { $_ // '' } ($server, $async )));
 660     if ( (!defined($ENV{GATEWAY_INTERFACE})) && defined($context->{"Zconn"}->{$cache_key}) && (0 == $context->{"Zconn"}->{$cache_key}->errcode()) ) {
 661         # if we are running the script from the commandline, lets try to use the caching
 662         return $context->{"Zconn"}->{$cache_key};
 663     }
 664     $context->{"Zconn"}->{$cache_key}->destroy() if defined($context->{"Zconn"}->{$cache_key}); #destroy old connection before making a new one
 665     $context->{"Zconn"}->{$cache_key} = &_new_Zconn( $server, $async );
 666     return $context->{"Zconn"}->{$cache_key};
 667 }
 668
 669 =head2 _new_Zconn
 670
 671 $context->{"Zconn"} = &_new_Zconn($server,$async);
 672
 673 Internal function. Creates a new database connection from the data given in the current context and returns it.
 674
 675 C<$server> one of the servers defined in the koha-conf.xml file
 676
 677 C<$async> whether this is a asynchronous connection
 678
 679 C<$auth> whether this connection has rw access (1) or just r access (0 or NULL)
 680
 681 =cut
 682
 683 sub _new_Zconn {
 684     my ( $server, $async ) = @_;
 685
 686     my $tried=0; # first attempt
 687     my $Zconn; # connection object
 688     my $elementSetName;
 689     my $index_mode;
 690     my $syntax;
 691
 692     $server //= "biblioserver";
 693
 694     if ( $server eq 'biblioserver' ) {
 695         $index_mode = $context->{'config'}->{'zebra_bib_index_mode'} // 'dom';
 696     } elsif ( $server eq 'authorityserver' ) {
 697         $index_mode = $context->{'config'}->{'zebra_auth_index_mode'} // 'dom';
 698     }
 699
 700     if ( $index_mode eq 'grs1' ) {
 701         $elementSetName = 'F';
 702         $syntax = ( $context->preference("marcflavour") eq 'UNIMARC' )
 703                 ? 'unimarc'
 704                 : 'usmarc';
 705
 706     } else { # $index_mode eq 'dom'
 707         $syntax = 'xml';
 708         $elementSetName = 'marcxml';
 709     }
 710
 711     my $host = $context->{'listen'}->{$server}->{'content'};
 712     my $user = $context->{"serverinfo"}->{$server}->{"user"};
 713     my $password = $context->{"serverinfo"}->{$server}->{"password"};
 714     eval {
 715         # set options
 716         my $o = new ZOOM::Options();
 717         $o->option(user => $user) if $user && $password;
 718         $o->option(password => $password) if $user && $password;
 719         $o->option(async => 1) if $async;
 720         $o->option(cqlfile=> $context->{"server"}->{$server}->{"cql2rpn"});
 721         $o->option(cclfile=> $context->{"serverinfo"}->{$server}->{"ccl2rpn"});
 722         $o->option(preferredRecordSyntax => $syntax);
 723         $o->option(elementSetName => $elementSetName) if $elementSetName;
 724         $o->option(databaseName => $context->{"config"}->{$server}||"biblios");
 725
 726         # create a new connection object
 727         $Zconn= create ZOOM::Connection($o);
 728
 729         # forge to server
 730         $Zconn->connect($host, 0);
 731
 732         # check for errors and warn
 733         if ($Zconn->errcode() !=0) {
 734             warn "something wrong with the connection: ". $Zconn->errmsg();
 735         }
 736     };
 737     return $Zconn;
 738 }
 739
 740 # _new_dbh
 741 # Internal helper function (not a method!). This creates a new
 742 # database connection from the data given in the current context, and
 743 # returns it.
 744 sub _new_dbh
 745 {
 746
 747     ## $context
 748     ## correct name for db_scheme
 749     my $db_driver = $context->{db_driver};
 750
 751     my $db_name   = $context->config("database");
 752     my $db_host   = $context->config("hostname");
 753     my $db_port   = $context->config("port") || '';
 754     my $db_user   = $context->config("user");
 755     my $db_passwd = $context->config("pass");
 756     # MJR added or die here, as we can't work without dbh
 757     my $dbh = DBIx::Connector->connect(
 758         "dbi:$db_driver:dbname=$db_name;host=$db_host;port=$db_port",
 759         $db_user, $db_passwd,
 760         {
 761             'RaiseError' => $ENV{DEBUG} ? 1 : 0
 762         }
 763     );
 764
 765     # Check for the existence of a systempreference table; if we don't have this, we don't
 766     # have a valid database and should not set RaiseError in order to allow the installer
 767     # to run; installer will not run otherwise since we raise all db errors
 768
 769     eval {
 770                 local $dbh->{PrintError} = 0;
 771                 local $dbh->{RaiseError} = 1;
 772                 $dbh->do(qq{SELECT * FROM systempreferences WHERE 1 = 0 });
 773     };
 774
 775     if ($@) {
 776         $dbh->{RaiseError} = 0;
 777     }
 778
 779     if ( $db_driver eq 'mysql' ) {
 780         $dbh->{mysql_auto_reconnect} = 1;
 781     }
 782
 783         my $tz = $ENV{TZ};
 784     if ( $db_driver eq 'mysql' ) {
 785         # Koha 3.0 is utf-8, so force utf8 communication between mySQL and koha, whatever the mysql default config.
 786         # this is better than modifying my.cnf (and forcing all communications to be in utf8)
 787         $dbh->{'mysql_enable_utf8'}=1; #enable
 788         $dbh->do("set NAMES 'utf8'");
 789         ($tz) and $dbh->do(qq(SET time_zone = "$tz"));
 790     }
 791     elsif ( $db_driver eq 'Pg' ) {
 792             $dbh->do( "set client_encoding = 'UTF8';" );
 793         ($tz) and $dbh->do(qq(SET TIME ZONE = "$tz"));
 794     }
 795     return $dbh;
 796 }
 797
 798 =head2 dbh
 799
 800   $dbh = C4::Context->dbh;
 801
 802 Returns a database handle connected to the Koha database for the
 803 current context. If no connection has yet been made, this method
 804 creates one, and connects to the database.
 805
 806 This database handle is cached for future use: if you call
 807 C<C4::Context-E<gt>dbh> twice, you will get the same handle both
 808 times. If you need a second database handle, use C<&new_dbh> and
 809 possibly C<&set_dbh>.
 810
 811 =cut
 812
 813 #'
 814 sub dbh
 815 {
 816     my $self = shift;
 817     my $params = shift;
 818     my $sth;
 819
 820     unless ( $params->{new} ) {
 821         if ( defined($context->{db_driver}) && $context->{db_driver} eq 'mysql' && $context->{"dbh"} ) {
 822             return $context->{"dbh"};
 823         } elsif ( defined($context->{"dbh"}) && $context->{"dbh"}->ping() ) {
 824             return $context->{"dbh"};
 825         }
 826     }
 827
 828     # No database handle or it died . Create one.
 829     $context->{"dbh"} = &_new_dbh();
 830
 831     return $context->{"dbh"};
 832 }
 833
 834 =head2 new_dbh
 835
 836   $dbh = C4::Context->new_dbh;
 837
 838 Creates a new connection to the Koha database for the current context,
 839 and returns the database handle (a C<DBI::db> object).
 840
 841 The handle is not saved anywhere: this method is strictly a
 842 convenience function; the point is that it knows which database to
 843 connect to so that the caller doesn't have to know.
 844
 845 =cut
 846
 847 #'
 848 sub new_dbh
 849 {
 850     my $self = shift;
 851
 852     return &_new_dbh();
 853 }
 854
 855 =head2 set_dbh
 856
 857   $my_dbh = C4::Connect->new_dbh;
 858   C4::Connect->set_dbh($my_dbh);
 859   ...
 860   C4::Connect->restore_dbh;
 861
 862 C<&set_dbh> and C<&restore_dbh> work in a manner analogous to
 863 C<&set_context> and C<&restore_context>.
 864
 865 C<&set_dbh> saves the current database handle on a stack, then sets
 866 the current database handle to C<$my_dbh>.
 867
 868 C<$my_dbh> is assumed to be a good database handle.
 869
 870 =cut
 871
 872 #'
 873 sub set_dbh
 874 {
 875     my $self = shift;
 876     my $new_dbh = shift;
 877
 878     # Save the current database handle on the handle stack.
 879     # We assume that $new_dbh is all good: if the caller wants to
 880     # screw himself by passing an invalid handle, that's fine by
 881     # us.
 882     push @{$context->{"dbh_stack"}}, $context->{"dbh"};
 883     $context->{"dbh"} = $new_dbh;
 884 }
 885
 886 =head2 restore_dbh
 887
 888   C4::Context->restore_dbh;
 889
 890 Restores the database handle saved by an earlier call to
 891 C<C4::Context-E<gt>set_dbh>.
 892
 893 =cut
 894
 895 #'
 896 sub restore_dbh
 897 {
 898     my $self = shift;
 899
 900     if ($#{$context->{"dbh_stack"}} < 0)
 901     {
 902         # Stack underflow
 903         die "DBH stack underflow";
 904     }
 905
 906     # Pop the old database handle and set it.
 907     $context->{"dbh"} = pop @{$context->{"dbh_stack"}};
 908
 909     # FIXME - If it is determined that restore_context should
 910     # return something, then this function should, too.
 911 }
 912
 913 =head2 queryparser
 914
 915   $queryparser = C4::Context->queryparser
 916
 917 Returns a handle to an initialized Koha::QueryParser::Driver::PQF object.
 918
 919 =cut
 920
 921 sub queryparser {
 922     my $self = shift;
 923     unless (defined $context->{"queryparser"}) {
 924         $context->{"queryparser"} = &_new_queryparser();
 925     }
 926
 927     return
 928       defined( $context->{"queryparser"} )
 929       ? $context->{"queryparser"}->new
 930       : undef;
 931 }
 932
 933 =head2 _new_queryparser
 934
 935 Internal helper function to create a new QueryParser object. QueryParser
 936 is loaded dynamically so as to keep the lack of the QueryParser library from
 937 getting in anyone's way.
 938
 939 =cut
 940
 941 sub _new_queryparser {
 942     my $qpmodules = {
 943         'OpenILS::QueryParser'           => undef,
 944         'Koha::QueryParser::Driver::PQF' => undef
 945     };
 946     if ( can_load( 'modules' => $qpmodules ) ) {
 947         my $QParser     = Koha::QueryParser::Driver::PQF->new();
 948         my $config_file = $context->config('queryparser_config');
 949         $config_file ||= '/etc/koha/searchengine/queryparser.yaml';
 950         if ( $QParser->load_config($config_file) ) {
 951             # Set 'keyword' as the default search class
 952             $QParser->default_search_class('keyword');
 953             # TODO: allow indexes to be configured in the database
 954             return $QParser;
 955         }
 956     }
 957     return;
 958 }
 959
 960 =head2 marcfromkohafield
 961
 962   $dbh = C4::Context->marcfromkohafield;
 963
 964 Returns a hash with marcfromkohafield.
 965
 966 This hash is cached for future use: if you call
 967 C<C4::Context-E<gt>marcfromkohafield> twice, you will get the same hash without real DB access
 968
 969 =cut
 970
 971 #'
 972 sub marcfromkohafield
 973 {
 974     my $retval = {};
 975
 976     # If the hash already exists, return it.
 977     return $context->{"marcfromkohafield"} if defined($context->{"marcfromkohafield"});
 978
 979     # No hash. Create one.
 980     $context->{"marcfromkohafield"} = &_new_marcfromkohafield();
 981
 982     return $context->{"marcfromkohafield"};
 983 }
 984
 985 # _new_marcfromkohafield
 986 # Internal helper function (not a method!). This creates a new
 987 # hash with stopwords
 988 sub _new_marcfromkohafield
 989 {
 990     my $dbh = C4::Context->dbh;
 991     my $marcfromkohafield;
 992     my $sth = $dbh->prepare("select frameworkcode,kohafield,tagfield,tagsubfield from marc_subfield_structure where kohafield > ''");
 993     $sth->execute;
 994     while (my ($frameworkcode,$kohafield,$tagfield,$tagsubfield) = $sth->fetchrow) {
 995         my $retval = {};
 996         $marcfromkohafield->{$frameworkcode}->{$kohafield} = [$tagfield,$tagsubfield];
 997     }
 998     return $marcfromkohafield;
 999 }
1000
1001 =head2 stopwords
1002
1003   $dbh = C4::Context->stopwords;
1004
1005 Returns a hash with stopwords.
1006
1007 This hash is cached for future use: if you call
1008 C<C4::Context-E<gt>stopwords> twice, you will get the same hash without real DB access
1009
1010 =cut
1011
1012 #'
1013 sub stopwords
1014 {
1015     my $retval = {};
1016
1017     # If the hash already exists, return it.
1018     return $context->{"stopwords"} if defined($context->{"stopwords"});
1019
1020     # No hash. Create one.
1021     $context->{"stopwords"} = &_new_stopwords();
1022
1023     return $context->{"stopwords"};
1024 }
1025
1026 # _new_stopwords
1027 # Internal helper function (not a method!). This creates a new
1028 # hash with stopwords
1029 sub _new_stopwords
1030 {
1031     my $dbh = C4::Context->dbh;
1032     my $stopwordlist;
1033     my $sth = $dbh->prepare("select word from stopwords");
1034     $sth->execute;
1035     while (my $stopword = $sth->fetchrow_array) {
1036         $stopwordlist->{$stopword} = uc($stopword);
1037     }
1038     $stopwordlist->{A} = "A" unless $stopwordlist;
1039     return $stopwordlist;
1040 }
1041
1042 =head2 userenv
1043
1044   C4::Context->userenv;
1045
1046 Retrieves a hash for user environment variables.
1047
1048 This hash shall be cached for future use: if you call
1049 C<C4::Context-E<gt>userenv> twice, you will get the same hash without real DB access
1050
1051 =cut
1052
1053 #'
1054 sub userenv {
1055     my $var = $context->{"activeuser"};
1056     if (defined $var and defined $context->{"userenv"}->{$var}) {
1057         return $context->{"userenv"}->{$var};
1058     } else {
1059         return;
1060     }
1061 }
1062
1063 =head2 set_userenv
1064
1065   C4::Context->set_userenv($usernum, $userid, $usercnum,
1066                            $userfirstname, $usersurname,
1067                            $userbranch, $branchname, $userflags,
1068                            $emailaddress, $branchprinter, $persona);
1069
1070 Establish a hash of user environment variables.
1071
1072 set_userenv is called in Auth.pm
1073
1074 =cut
1075
1076 #'
1077 sub set_userenv {
1078     shift @_;
1079     my ($usernum, $userid, $usercnum, $userfirstname, $usersurname, $userbranch, $branchname, $userflags, $emailaddress, $branchprinter, $persona, $shibboleth)=
1080     map { Encode::is_utf8( $_ ) ? $_ : Encode::decode('UTF-8', $_) } # CGI::Session doesn't handle utf-8, so we decode it here
1081     @_;
1082     my $var=$context->{"activeuser"} || '';
1083     my $cell = {
1084         "number"     => $usernum,
1085         "id"         => $userid,
1086         "cardnumber" => $usercnum,
1087         "firstname"  => $userfirstname,
1088         "surname"    => $usersurname,
1089         #possibly a law problem
1090         "branch"     => $userbranch,
1091         "branchname" => $branchname,
1092         "flags"      => $userflags,
1093         "emailaddress"     => $emailaddress,
1094         "branchprinter"    => $branchprinter,
1095         "persona"    => $persona,
1096         "shibboleth" => $shibboleth,
1097     };
1098     $context->{userenv}->{$var} = $cell;
1099     return $cell;
1100 }
1101
1102 sub set_shelves_userenv {
1103         my ($type, $shelves) = @_ or return;
1104         my $activeuser = $context->{activeuser} or return;
1105         $context->{userenv}->{$activeuser}->{barshelves} = $shelves if $type eq 'bar';
1106         $context->{userenv}->{$activeuser}->{pubshelves} = $shelves if $type eq 'pub';
1107         $context->{userenv}->{$activeuser}->{totshelves} = $shelves if $type eq 'tot';
1108 }
1109
1110 sub get_shelves_userenv {
1111         my $active;
1112         unless ($active = $context->{userenv}->{$context->{activeuser}}) {
1113                 $debug and warn "get_shelves_userenv cannot retrieve context->{userenv}->{context->{activeuser}}";
1114                 return;
1115         }
1116         my $totshelves = $active->{totshelves} or undef;
1117         my $pubshelves = $active->{pubshelves} or undef;
1118         my $barshelves = $active->{barshelves} or undef;
1119         return ($totshelves, $pubshelves, $barshelves);
1120 }
1121
1122 =head2 _new_userenv
1123
1124   C4::Context->_new_userenv($session);  # FIXME: This calling style is wrong for what looks like an _internal function
1125
1126 Builds a hash for user environment variables.
1127
1128 This hash shall be cached for future use: if you call
1129 C<C4::Context-E<gt>userenv> twice, you will get the same hash without real DB access
1130
1131 _new_userenv is called in Auth.pm
1132
1133 =cut
1134
1135 #'
1136 sub _new_userenv
1137 {
1138     shift;  # Useless except it compensates for bad calling style
1139     my ($sessionID)= @_;
1140      $context->{"activeuser"}=$sessionID;
1141 }
1142
1143 =head2 _unset_userenv
1144
1145   C4::Context->_unset_userenv;
1146
1147 Destroys the hash for activeuser user environment variables.
1148
1149 =cut
1150
1151 #'
1152
1153 sub _unset_userenv
1154 {
1155     my ($sessionID)= @_;
1156     undef $context->{"activeuser"} if ($context->{"activeuser"} eq $sessionID);
1157 }
1158
1159
1160 =head2 get_versions
1161
1162   C4::Context->get_versions
1163
1164 Gets various version info, for core Koha packages, Currently called from carp handle_errors() sub, to send to browser if 'DebugLevel' syspref is set to '2'.
1165
1166 =cut
1167
1168 #'
1169
1170 # A little example sub to show more debugging info for CGI::Carp
1171 sub get_versions {
1172     my %versions;
1173     $versions{kohaVersion}  = Koha::version();
1174     $versions{kohaDbVersion} = C4::Context->preference('version');
1175     $versions{osVersion} = join(" ", POSIX::uname());
1176     $versions{perlVersion} = $];
1177     {
1178         no warnings qw(exec); # suppress warnings if unable to find a program in $PATH
1179         $versions{mysqlVersion}  = `mysql -V`;
1180         $versions{apacheVersion} = `httpd -v`;
1181         $versions{apacheVersion} = `httpd2 -v`            unless  $versions{apacheVersion} ;
1182         $versions{apacheVersion} = `apache2 -v`           unless  $versions{apacheVersion} ;
1183         $versions{apacheVersion} = `/usr/sbin/apache2 -v` unless  $versions{apacheVersion} ;
1184     }
1185     return %versions;
1186 }
1187
1188
1189 =head2 tz
1190
1191   C4::Context->tz
1192
1193   Returns a DateTime::TimeZone object for the system timezone
1194
1195 =cut
1196
1197 sub tz {
1198     my $self = shift;
1199     if (!defined $context->{tz}) {
1200         $context->{tz} = DateTime::TimeZone->new(name => 'local');
1201     }
1202     return $context->{tz};
1203 }
1204
1205
1206 =head2 IsSuperLibrarian
1207
1208     C4::Context->IsSuperLibrarian();
1209
1210 =cut
1211
1212 sub IsSuperLibrarian {
1213     my $userenv = C4::Context->userenv;
1214
1215     unless ( $userenv and exists $userenv->{flags} ) {
1216         # If we reach this without a user environment,
1217         # assume that we're running from a command-line script,
1218         # and act as a superlibrarian.
1219         carp("C4::Context->userenv not defined!");
1220         return 1;
1221     }
1222
1223     return ($userenv->{flags}//0) % 2;
1224 }
1225
1226 =head2 interface
1227
1228 Sets the current interface for later retrieval in any Perl module
1229
1230     C4::Context->interface('opac');
1231     C4::Context->interface('intranet');
1232     my $interface = C4::Context->interface;
1233
1234 =cut
1235
1236 sub interface {
1237     my ($class, $interface) = @_;
1238
1239     if (defined $interface) {
1240         $interface = lc $interface;
1241         if ($interface eq 'opac' || $interface eq 'intranet') {
1242             $context->{interface} = $interface;
1243         } else {
1244             warn "invalid interface : '$interface'";
1245         }
1246     }
1247
1248     return $context->{interface} // 'opac';
1249 }
1250
1251 1;
1252 __END__
1253
1254 =head1 ENVIRONMENT
1255
1256 =head2 C<KOHA_CONF>
1257
1258 Specifies the configuration file to read.
1259
1260 =head1 SEE ALSO
1261
1262 XML::Simple
1263
1264 =head1 AUTHORS
1265
1266 Andrew Arensburger <arensb at ooblick dot com>
1267
1268 Joshua Ferraro <jmf at liblime dot com>
1269