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package C4::Context;
# Copyright 2002 Katipo Communications
# This file is part of Koha.
# Koha is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
# Koha is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with Koha; if not, see <>.
use strict;
use warnings;
use vars qw($VERSION $AUTOLOAD $context @context_stack $servers $memcached $ismemcached);
require CGI::Carp;
# FIXME for future reference, CGI::Carp doc says
# "Note that fatalsToBrowser does not work with mod_perl version 2.0 and higher."
import CGI::Carp qw(fatalsToBrowser);
sub handle_errors {
my $msg = shift;
my $debug_level;
eval {C4::Context->dbh();};
if ($@){
$debug_level = 1;
else {
$debug_level = C4::Context->preference("DebugLevel");
print q(<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<html lang="en" xml:lang="en" xmlns="">
<head><title>Koha Error</title></head>
if ($debug_level eq "2"){
# debug 2 , print extra info too.
my %versions = get_versions();
# a little example table with various version info";
print "
<h1>Koha error</h1>
<p>The following fatal error has occurred:</p>
<tr><th>Apache</th><td> $versions{apacheVersion}</td></tr>
<tr><th>Koha</th><td> $versions{kohaVersion}</td></tr>
<tr><th>Koha DB</th><td> $versions{kohaDbVersion}</td></tr>
<tr><th>MySQL</th><td> $versions{mysqlVersion}</td></tr>
<tr><th>OS</th><td> $versions{osVersion}</td></tr>
<tr><th>Perl</th><td> $versions{perlVersion}</td></tr>
} elsif ($debug_level eq "1"){
print "
<h1>Koha error</h1>
<p>The following fatal error has occurred:</p>
} else {
print "<p>production mode - trapped fatal error</p>";
print "</body></html>";
## give a stack backtrace if KOHA_BACKTRACES is set
## can't rely on DebugLevel for this, as we're not yet connected
$main::SIG{__DIE__} = \&CGI::Carp::confess;
} # else there is no browser to send fatals to!
# Check if there are memcached servers set
if ($servers) {
# Load required libraries and create the memcached object
require Cache::Memcached;
$memcached = Cache::Memcached->new({
servers => [ $servers ],
debug => 0,
compress_threshold => 10_000,
expire_time => 600,
namespace => $ENV{'MEMCACHED_NAMESPACE'} || 'koha'
# Verify memcached available (set a variable and test the output)
$ismemcached = $memcached->set('ismemcached','1');
$VERSION = '';
use DBIx::Connector;
use Encode;
use ZOOM;
use XML::Simple;
use C4::Boolean;
use C4::Debug;
use Koha;
use POSIX ();
use DateTime::TimeZone;
use Module::Load::Conditional qw(can_load);
use Carp;
=head1 NAME
C4::Context - Maintain and manipulate the context of a Koha script
use C4::Context;
use C4::Context("/path/to/koha-conf.xml");
$config_value = C4::Context->config("config_variable");
$koha_preference = C4::Context->preference("preference");
$db_handle = C4::Context->dbh;
$Zconn = C4::Context->Zconn;
$stopwordhash = C4::Context->stopwords;
When a Koha script runs, it makes use of a certain number of things:
configuration settings in F</etc/koha/koha-conf.xml>, a connection to the Koha
databases, and so forth. These things make up the I<context> in which
the script runs.
This module takes care of setting up the context for a script:
figuring out which configuration file to load, and loading it, opening
a connection to the right database, and so forth.
Most scripts will only use one context. They can simply have
use C4::Context;
at the top.
Other scripts may need to use several contexts. For instance, if a
library has two databases, one for a certain collection, and the other
for everything else, it might be necessary for a script to use two
different contexts to search both databases. Such scripts should use
the C<&set_context> and C<&restore_context> functions, below.
By default, C4::Context reads the configuration from
F</etc/koha/koha-conf.xml>. This may be overridden by setting the C<$KOHA_CONF>
environment variable to the pathname of a configuration file to use.
=head1 METHODS
# In addition to what is said in the POD above, a Context object is a
# reference-to-hash with the following fields:
# config
# A reference-to-hash whose keys and values are the
# configuration variables and values specified in the config
# file (/etc/koha/koha-conf.xml).
# dbh
# A handle to the appropriate database for this context.
# dbh_stack
# Used by &set_dbh and &restore_dbh to hold other database
# handles for this context.
# Zconn
# A connection object for the Zebra server
# Koha's main configuration file koha-conf.xml
# is searched for according to this priority list:
# 1. Path supplied via use C4::Context '/path/to/koha-conf.xml'
# 2. Path supplied in KOHA_CONF environment variable.
# 3. Path supplied in INSTALLED_CONFIG_FNAME, as long
# as value has changed from its default of
# '__KOHA_CONF_DIR__/koha-conf.xml', as happens
# when Koha is installed in 'standard' or 'single'
# mode.
# 4. Path supplied in CONFIG_FNAME.
# The first entry that refers to a readable file is used.
use constant CONFIG_FNAME => "/etc/koha/koha-conf.xml";
# Default config file, if none is specified
my $INSTALLED_CONFIG_FNAME = '__KOHA_CONF_DIR__/koha-conf.xml';
# path to config file set by installer
# __KOHA_CONF_DIR__ is set by rewrite-confg.PL
# when Koha is installed in 'standard' or 'single'
# mode. If Koha was installed in 'dev' mode,
# __KOHA_CONF_DIR__ is *not* rewritten; instead
# developers should set the KOHA_CONF environment variable
$context = undef; # Initially, no context is set
@context_stack = (); # Initially, no saved contexts
=head2 read_config_file
Reads the specified Koha config file.
Returns an object containing the configuration variables. The object's
structure is a bit complex to the uninitiated ... take a look at the
koha-conf.xml file as well as the XML::Simple documentation for details. Or,
here are a few examples that may give you what you need:
The simple elements nested within the <config> element:
my $pass = $koha->{'config'}->{'pass'};
The <listen> elements:
my $listen = $koha->{'listen'}->{'biblioserver'}->{'content'};
The elements nested within the <server> element:
my $ccl2rpn = $koha->{'server'}->{'biblioserver'}->{'cql2rpn'};
Returns undef in case of error.
sub read_config_file { # Pass argument naming config file to read
my $koha = XMLin(shift, keyattr => ['id'], forcearray => ['listen', 'server', 'serverinfo'], suppressempty => '');
if ($ismemcached) {
return $koha; # Return value: ref-to-hash holding the configuration
=head2 ismemcached
Returns the value of the $ismemcached variable (0/1)
sub ismemcached {
return $ismemcached;
=head2 memcached
If $ismemcached is true, returns the $memcache variable.
Returns undef otherwise
sub memcached {
if ($ismemcached) {
return $memcached;
} else {
=head2 db_scheme2dbi
my $dbd_driver_name = C4::Context::db_schema2dbi($scheme);
This routines translates a database type to part of the name
of the appropriate DBD driver to use when establishing a new
database connection. It recognizes 'mysql' and 'Pg'; if any
other scheme is supplied it defaults to 'mysql'.
sub db_scheme2dbi {
my $scheme = shift // '';
return $scheme eq 'Pg' ? $scheme : 'mysql';
sub import {
# Create the default context ($C4::Context::Context)
# the first time the module is called
# (a config file can be optionaly passed)
# default context allready exists?
return if $context;
# no ? so load it!
my ($pkg,$config_file) = @_ ;
my $new_ctx = __PACKAGE__->new($config_file);
return unless $new_ctx;
# if successfully loaded, use it by default
=head2 new
$context = new C4::Context;
$context = new C4::Context("/path/to/koha-conf.xml");
Allocates a new context. Initializes the context from the specified
file, which defaults to either the file given by the C<$KOHA_CONF>
environment variable, or F</etc/koha/koha-conf.xml>.
It saves the koha-conf.xml values in the declared memcached server(s)
if currently available and uses those values until them expire and
re-reads them.
C<&new> does not set this context as the new default context; for
that, use C<&set_context>.
# Revision History:
# 2004-08-10 A. Tarallo: Added check if the conf file is not empty
sub new {
my $class = shift;
my $conf_fname = shift; # Config file to load
my $self = {};
# check that the specified config file exists and is not empty
undef $conf_fname unless
(defined $conf_fname && -s $conf_fname);
# Figure out a good config file to load if none was specified.
if (!defined($conf_fname))
# If the $KOHA_CONF environment variable is set, use
# that. Otherwise, use the built-in default.
if (exists $ENV{"KOHA_CONF"} and $ENV{'KOHA_CONF'} and -s $ENV{"KOHA_CONF"}) {
$conf_fname = $ENV{"KOHA_CONF"};
# NOTE: be careful -- don't change __KOHA_CONF_DIR in the above
# regex to anything else -- don't want installer to rewrite it
} elsif (-s CONFIG_FNAME) {
$conf_fname = CONFIG_FNAME;
} else {
warn "unable to locate Koha configuration file koha-conf.xml";
if ($ismemcached) {
# retreive from memcached
$self = $memcached->get('kohaconf');
if (not defined $self) {
# not in memcached yet
$self = read_config_file($conf_fname);
} else {
# non-memcached env, read from file
$self = read_config_file($conf_fname);
$self->{"config_file"} = $conf_fname;
warn "read_config_file($conf_fname) returned undef" if !defined($self->{"config"});
return if !defined($self->{"config"});
$self->{"dbh"} = undef; # Database handle
$self->{"Zconn"} = undef; # Zebra Connections
$self->{"stopwords"} = undef; # stopwords list
$self->{"marcfromkohafield"} = undef; # the hash with relations between koha table fields and MARC field/subfield
$self->{"userenv"} = undef; # User env
$self->{"activeuser"} = undef; # current active user
$self->{"shelves"} = undef;
$self->{tz} = undef; # local timezone object
bless $self, $class;
$self->{db_driver} = db_scheme2dbi($self->config('db_scheme')); # cache database driver
return $self;
=head2 set_context
$context = new C4::Context;
set_context C4::Context $context;
restore_context C4::Context;
In some cases, it might be necessary for a script to use multiple
contexts. C<&set_context> saves the current context on a stack, then
sets the context to C<$context>, which will be used in future
operations. To restore the previous context, use C<&restore_context>.
sub set_context
my $self = shift;
my $new_context; # The context to set
# Figure out whether this is a class or instance method call.
# We're going to make the assumption that control got here
# through valid means, i.e., that the caller used an instance
# or class method call, and that control got here through the
# usual inheritance mechanisms. The caller can, of course,
# break this assumption by playing silly buggers, but that's
# harder to do than doing it properly, and harder to check
# for.
if (ref($self) eq "")
# Class method. The new context is the next argument.
$new_context = shift;
} else {
# Instance method. The new context is $self.
$new_context = $self;
# Save the old context, if any, on the stack
push @context_stack, $context if defined($context);
# Set the new context
$context = $new_context;
=head2 restore_context
Restores the context set by C<&set_context>.
sub restore_context
my $self = shift;
if ($#context_stack < 0)
# Stack underflow.
die "Context stack underflow";
# Pop the old context and set it.
$context = pop @context_stack;
# FIXME - Should this return something, like maybe the context
# that was current when this was called?
=head2 config
$value = C4::Context->config("config_variable");
$value = C4::Context->config_variable;
Returns the value of a variable specified in the configuration file
from which the current context was created.
The second form is more compact, but of course may conflict with
method names. If there is a configuration variable called "new", then
C<C4::Config-E<gt>new> will not return it.
sub _common_config {
my $var = shift;
my $term = shift;
return if !defined($context->{$term});
# Presumably $self->{$term} might be
# undefined if the config file given to &new
# didn't exist, and the caller didn't bother
# to check the return value.
# Return the value of the requested config variable
return $context->{$term}->{$var};
sub config {
return _common_config($_[1],'config');
sub zebraconfig {
return _common_config($_[1],'server');
sub ModZebrations {
return _common_config($_[1],'serverinfo');
=head2 preference
$sys_preference = C4::Context->preference('some_variable');
Looks up the value of the given system preference in the
systempreferences table of the Koha database, and returns it. If the
variable is not set or does not exist, undef is returned.
In case of an error, this may return 0.
Note: It is impossible to tell the difference between system
preferences which do not exist, and those whose values are set to NULL
with this method.
# FIXME: running this under mod_perl will require a means of
# flushing the caching mechanism.
my %sysprefs;
my $use_syspref_cache = 1;
sub preference {
my $self = shift;
my $var = shift; # The system preference to return
if ($use_syspref_cache && exists $sysprefs{lc $var}) {
return $sysprefs{lc $var};
my $dbh = C4::Context->dbh or return 0;
my $value;
if ( defined $ENV{"OVERRIDE_SYSPREF_$var"} ) {
$value = $ENV{"OVERRIDE_SYSPREF_$var"};
} else {
# Look up systempreferences.variable==$var
my $sql = q{
SELECT value
FROM systempreferences
WHERE variable = ?
$value = $dbh->selectrow_array( $sql, {}, lc $var );
$sysprefs{lc $var} = $value;
return $value;
sub boolean_preference {
my $self = shift;
my $var = shift; # The system preference to return
my $it = preference($self, $var);
return defined($it)? C4::Boolean::true_p($it): undef;
=head2 enable_syspref_cache
Enable the in-memory syspref cache used by C4::Context. This is the
default behavior.
sub enable_syspref_cache {
my ($self) = @_;
$use_syspref_cache = 1;
=head2 disable_syspref_cache
Disable the in-memory syspref cache used by C4::Context. This should be
used with Plack and other persistent environments.
sub disable_syspref_cache {
my ($self) = @_;
$use_syspref_cache = 0;
=head2 clear_syspref_cache
cleans the internal cache of sysprefs. Please call this method if
you update the systempreferences table. Otherwise, your new changes
will not be seen by this process.
sub clear_syspref_cache {
%sysprefs = ();
=head2 set_preference
C4::Context->set_preference( $variable, $value );
This updates a preference's value both in the systempreferences table and in
the sysprefs cache.
sub set_preference {
my $self = shift;
my $var = lc(shift);
my $value = shift;
my $dbh = C4::Context->dbh or return 0;
my $type = $dbh->selectrow_array( "SELECT type FROM systempreferences WHERE variable = ?", {}, $var );
$value = 0 if ( $type && $type eq 'YesNo' && $value eq '' );
my $sth = $dbh->prepare( "
INSERT INTO systempreferences
( variable, value )
VALUES( ?, ? )
" );
if($sth->execute( $var, $value )) {
$sysprefs{$var} = $value;
# This implements C4::Config->foo, and simply returns
# C4::Context->config("foo"), as described in the documentation for
# &config, above.
# FIXME - Perhaps this should be extended to check &config first, and
# then &preference if that fails. OTOH, AUTOLOAD could lead to crappy
# code, so it'd probably be best to delete it altogether so as not to
# encourage people to use it.
my $self = shift;
$AUTOLOAD =~ s/.*:://; # Chop off the package name,
# leaving only the function name.
return $self->config($AUTOLOAD);
=head2 Zconn
$Zconn = C4::Context->Zconn
Returns a connection to the Zebra database
C<$server> one of the servers defined in the koha-conf.xml file
C<$async> whether this is a asynchronous connection
sub Zconn {
my ($self, $server, $async ) = @_;
my $cache_key = join ('::', (map { $_ // '' } ($server, $async )));
if ( (!defined($ENV{GATEWAY_INTERFACE})) && defined($context->{"Zconn"}->{$cache_key}) && (0 == $context->{"Zconn"}->{$cache_key}->errcode()) ) {
# if we are running the script from the commandline, lets try to use the caching
return $context->{"Zconn"}->{$cache_key};
$context->{"Zconn"}->{$cache_key}->destroy() if defined($context->{"Zconn"}->{$cache_key}); #destroy old connection before making a new one
$context->{"Zconn"}->{$cache_key} = &_new_Zconn( $server, $async );
return $context->{"Zconn"}->{$cache_key};
=head2 _new_Zconn
$context->{"Zconn"} = &_new_Zconn($server,$async);
Internal function. Creates a new database connection from the data given in the current context and returns it.
C<$server> one of the servers defined in the koha-conf.xml file
C<$async> whether this is a asynchronous connection
C<$auth> whether this connection has rw access (1) or just r access (0 or NULL)
sub _new_Zconn {
my ( $server, $async ) = @_;
my $tried=0; # first attempt
my $Zconn; # connection object
my $elementSetName;
my $index_mode;
my $syntax;
$server //= "biblioserver";
if ( $server eq 'biblioserver' ) {
$index_mode = $context->{'config'}->{'zebra_bib_index_mode'} // 'dom';
} elsif ( $server eq 'authorityserver' ) {
$index_mode = $context->{'config'}->{'zebra_auth_index_mode'} // 'dom';
if ( $index_mode eq 'grs1' ) {
$elementSetName = 'F';
$syntax = ( $context->preference("marcflavour") eq 'UNIMARC' )
? 'unimarc'
: 'usmarc';
} else { # $index_mode eq 'dom'
$syntax = 'xml';
$elementSetName = 'marcxml';
my $host = $context->{'listen'}->{$server}->{'content'};
my $user = $context->{"serverinfo"}->{$server}->{"user"};
my $password = $context->{"serverinfo"}->{$server}->{"password"};
eval {
# set options
my $o = new ZOOM::Options();
$o->option(user => $user) if $user && $password;
$o->option(password => $password) if $user && $password;
$o->option(async => 1) if $async;
$o->option(cqlfile=> $context->{"server"}->{$server}->{"cql2rpn"});
$o->option(cclfile=> $context->{"serverinfo"}->{$server}->{"ccl2rpn"});
$o->option(preferredRecordSyntax => $syntax);
$o->option(elementSetName => $elementSetName) if $elementSetName;
$o->option(databaseName => $context->{"config"}->{$server}||"biblios");
# create a new connection object
$Zconn= create ZOOM::Connection($o);
# forge to server
$Zconn->connect($host, 0);
# check for errors and warn
if ($Zconn->errcode() !=0) {
warn "something wrong with the connection: ". $Zconn->errmsg();
return $Zconn;
# _new_dbh
# Internal helper function (not a method!). This creates a new
# database connection from the data given in the current context, and
# returns it.
sub _new_dbh
## $context
## correct name for db_scheme
my $db_driver = $context->{db_driver};
my $db_name = $context->config("database");
my $db_host = $context->config("hostname");
my $db_port = $context->config("port") || '';
my $db_user = $context->config("user");
my $db_passwd = $context->config("pass");
# MJR added or die here, as we can't work without dbh
my $dbh = DBIx::Connector->connect(
$db_user, $db_passwd,
'RaiseError' => $ENV{DEBUG} ? 1 : 0
# Check for the existence of a systempreference table; if we don't have this, we don't
# have a valid database and should not set RaiseError in order to allow the installer
# to run; installer will not run otherwise since we raise all db errors
eval {
local $dbh->{PrintError} = 0;
local $dbh->{RaiseError} = 1;
$dbh->do(qq{SELECT * FROM systempreferences WHERE 1 = 0 });
if ($@) {
$dbh->{RaiseError} = 0;
if ( $db_driver eq 'mysql' ) {
$dbh->{mysql_auto_reconnect} = 1;
my $tz = $ENV{TZ};
if ( $db_driver eq 'mysql' ) {
# Koha 3.0 is utf-8, so force utf8 communication between mySQL and koha, whatever the mysql default config.
# this is better than modifying my.cnf (and forcing all communications to be in utf8)
$dbh->{'mysql_enable_utf8'}=1; #enable
$dbh->do("set NAMES 'utf8'");
($tz) and $dbh->do(qq(SET time_zone = "$tz"));
elsif ( $db_driver eq 'Pg' ) {
$dbh->do( "set client_encoding = 'UTF8';" );
($tz) and $dbh->do(qq(SET TIME ZONE = "$tz"));
return $dbh;
=head2 dbh
$dbh = C4::Context->dbh;
Returns a database handle connected to the Koha database for the
current context. If no connection has yet been made, this method
creates one, and connects to the database.
This database handle is cached for future use: if you call
C<C4::Context-E<gt>dbh> twice, you will get the same handle both
times. If you need a second database handle, use C<&new_dbh> and
possibly C<&set_dbh>.
sub dbh
my $self = shift;
my $params = shift;
my $sth;
unless ( $params->{new} ) {
if ( defined($context->{db_driver}) && $context->{db_driver} eq 'mysql' && $context->{"dbh"} ) {
return $context->{"dbh"};
} elsif ( defined($context->{"dbh"}) && $context->{"dbh"}->ping() ) {
return $context->{"dbh"};
# No database handle or it died . Create one.
$context->{"dbh"} = &_new_dbh();
return $context->{"dbh"};
=head2 new_dbh
$dbh = C4::Context->new_dbh;
Creates a new connection to the Koha database for the current context,
and returns the database handle (a C<DBI::db> object).
The handle is not saved anywhere: this method is strictly a
convenience function; the point is that it knows which database to
connect to so that the caller doesn't have to know.
sub new_dbh
my $self = shift;
return &_new_dbh();
=head2 set_dbh
$my_dbh = C4::Connect->new_dbh;
C<&set_dbh> and C<&restore_dbh> work in a manner analogous to
C<&set_context> and C<&restore_context>.
C<&set_dbh> saves the current database handle on a stack, then sets
the current database handle to C<$my_dbh>.
C<$my_dbh> is assumed to be a good database handle.
sub set_dbh
my $self = shift;
my $new_dbh = shift;
# Save the current database handle on the handle stack.
# We assume that $new_dbh is all good: if the caller wants to
# screw himself by passing an invalid handle, that's fine by
# us.
push @{$context->{"dbh_stack"}}, $context->{"dbh"};
$context->{"dbh"} = $new_dbh;
=head2 restore_dbh
Restores the database handle saved by an earlier call to
sub restore_dbh
my $self = shift;
if ($#{$context->{"dbh_stack"}} < 0)
# Stack underflow
die "DBH stack underflow";
# Pop the old database handle and set it.
$context->{"dbh"} = pop @{$context->{"dbh_stack"}};
# FIXME - If it is determined that restore_context should
# return something, then this function should, too.
=head2 queryparser
$queryparser = C4::Context->queryparser
Returns a handle to an initialized Koha::QueryParser::Driver::PQF object.
sub queryparser {
my $self = shift;
unless (defined $context->{"queryparser"}) {
$context->{"queryparser"} = &_new_queryparser();
defined( $context->{"queryparser"} )
? $context->{"queryparser"}->new
: undef;
=head2 _new_queryparser
Internal helper function to create a new QueryParser object. QueryParser
is loaded dynamically so as to keep the lack of the QueryParser library from
getting in anyone's way.
sub _new_queryparser {
my $qpmodules = {
'OpenILS::QueryParser' => undef,
'Koha::QueryParser::Driver::PQF' => undef
if ( can_load( 'modules' => $qpmodules ) ) {
my $QParser = Koha::QueryParser::Driver::PQF->new();
my $config_file = $context->config('queryparser_config');
$config_file ||= '/etc/koha/searchengine/queryparser.yaml';
if ( $QParser->load_config($config_file) ) {
# Set 'keyword' as the default search class
# TODO: allow indexes to be configured in the database
return $QParser;
=head2 marcfromkohafield
$dbh = C4::Context->marcfromkohafield;
Returns a hash with marcfromkohafield.
This hash is cached for future use: if you call
C<C4::Context-E<gt>marcfromkohafield> twice, you will get the same hash without real DB access
sub marcfromkohafield
my $retval = {};
# If the hash already exists, return it.
return $context->{"marcfromkohafield"} if defined($context->{"marcfromkohafield"});
# No hash. Create one.
$context->{"marcfromkohafield"} = &_new_marcfromkohafield();
return $context->{"marcfromkohafield"};
# _new_marcfromkohafield
# Internal helper function (not a method!). This creates a new
# hash with stopwords
sub _new_marcfromkohafield
my $dbh = C4::Context->dbh;
my $marcfromkohafield;
my $sth = $dbh->prepare("select frameworkcode,kohafield,tagfield,tagsubfield from marc_subfield_structure where kohafield > ''");
while (my ($frameworkcode,$kohafield,$tagfield,$tagsubfield) = $sth->fetchrow) {
my $retval = {};
$marcfromkohafield->{$frameworkcode}->{$kohafield} = [$tagfield,$tagsubfield];
return $marcfromkohafield;
=head2 stopwords
$dbh = C4::Context->stopwords;
Returns a hash with stopwords.
This hash is cached for future use: if you call
C<C4::Context-E<gt>stopwords> twice, you will get the same hash without real DB access
sub stopwords
my $retval = {};
# If the hash already exists, return it.
return $context->{"stopwords"} if defined($context->{"stopwords"});
# No hash. Create one.
$context->{"stopwords"} = &_new_stopwords();
return $context->{"stopwords"};
# _new_stopwords
# Internal helper function (not a method!). This creates a new
# hash with stopwords
sub _new_stopwords
my $dbh = C4::Context->dbh;
my $stopwordlist;
my $sth = $dbh->prepare("select word from stopwords");
while (my $stopword = $sth->fetchrow_array) {
$stopwordlist->{$stopword} = uc($stopword);
$stopwordlist->{A} = "A" unless $stopwordlist;
return $stopwordlist;
=head2 userenv
Retrieves a hash for user environment variables.
This hash shall be cached for future use: if you call
C<C4::Context-E<gt>userenv> twice, you will get the same hash without real DB access
sub userenv {
my $var = $context->{"activeuser"};
if (defined $var and defined $context->{"userenv"}->{$var}) {
return $context->{"userenv"}->{$var};
} else {
=head2 set_userenv
C4::Context->set_userenv($usernum, $userid, $usercnum,
$userfirstname, $usersurname,
$userbranch, $branchname, $userflags,
$emailaddress, $branchprinter, $persona);
Establish a hash of user environment variables.
set_userenv is called in
sub set_userenv {
shift @_;
my ($usernum, $userid, $usercnum, $userfirstname, $usersurname, $userbranch, $branchname, $userflags, $emailaddress, $branchprinter, $persona, $shibboleth)=
map { Encode::is_utf8( $_ ) ? $_ : Encode::decode('UTF-8', $_) } # CGI::Session doesn't handle utf-8, so we decode it here
my $var=$context->{"activeuser"} || '';
my $cell = {
"number" => $usernum,
"id" => $userid,
"cardnumber" => $usercnum,
"firstname" => $userfirstname,
"surname" => $usersurname,
#possibly a law problem
"branch" => $userbranch,
"branchname" => $branchname,
"flags" => $userflags,
"emailaddress" => $emailaddress,
"branchprinter" => $branchprinter,
"persona" => $persona,
"shibboleth" => $shibboleth,
$context->{userenv}->{$var} = $cell;
return $cell;
sub set_shelves_userenv {
my ($type, $shelves) = @_ or return;
my $activeuser = $context->{activeuser} or return;
$context->{userenv}->{$activeuser}->{barshelves} = $shelves if $type eq 'bar';
$context->{userenv}->{$activeuser}->{pubshelves} = $shelves if $type eq 'pub';
$context->{userenv}->{$activeuser}->{totshelves} = $shelves if $type eq 'tot';
sub get_shelves_userenv {
my $active;
unless ($active = $context->{userenv}->{$context->{activeuser}}) {
$debug and warn "get_shelves_userenv cannot retrieve context->{userenv}->{context->{activeuser}}";
my $totshelves = $active->{totshelves} or undef;
my $pubshelves = $active->{pubshelves} or undef;
my $barshelves = $active->{barshelves} or undef;
return ($totshelves, $pubshelves, $barshelves);
=head2 _new_userenv
C4::Context->_new_userenv($session); # FIXME: This calling style is wrong for what looks like an _internal function
Builds a hash for user environment variables.
This hash shall be cached for future use: if you call
C<C4::Context-E<gt>userenv> twice, you will get the same hash without real DB access
_new_userenv is called in
sub _new_userenv
shift; # Useless except it compensates for bad calling style
my ($sessionID)= @_;
=head2 _unset_userenv
Destroys the hash for activeuser user environment variables.
sub _unset_userenv
my ($sessionID)= @_;
undef $context->{"activeuser"} if ($context->{"activeuser"} eq $sessionID);
=head2 get_versions
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'.
# A little example sub to show more debugging info for CGI::Carp
sub get_versions {
my %versions;
$versions{kohaVersion} = Koha::version();
$versions{kohaDbVersion} = C4::Context->preference('version');
$versions{osVersion} = join(" ", POSIX::uname());
$versions{perlVersion} = $];
no warnings qw(exec); # suppress warnings if unable to find a program in $PATH
$versions{mysqlVersion} = `mysql -V`;
$versions{apacheVersion} = `httpd -v`;
$versions{apacheVersion} = `httpd2 -v` unless $versions{apacheVersion} ;
$versions{apacheVersion} = `apache2 -v` unless $versions{apacheVersion} ;
$versions{apacheVersion} = `/usr/sbin/apache2 -v` unless $versions{apacheVersion} ;
return %versions;
=head2 tz
Returns a DateTime::TimeZone object for the system timezone
sub tz {
my $self = shift;
if (!defined $context->{tz}) {
$context->{tz} = DateTime::TimeZone->new(name => 'local');
return $context->{tz};
=head2 IsSuperLibrarian
sub IsSuperLibrarian {
my $userenv = C4::Context->userenv;
unless ( $userenv and exists $userenv->{flags} ) {
# If we reach this without a user environment,
# assume that we're running from a command-line script,
# and act as a superlibrarian.
carp("C4::Context->userenv not defined!");
return 1;
return ($userenv->{flags}//0) % 2;
=head2 interface
Sets the current interface for later retrieval in any Perl module
my $interface = C4::Context->interface;
sub interface {
my ($class, $interface) = @_;
if (defined $interface) {
$interface = lc $interface;
if ($interface eq 'opac' || $interface eq 'intranet') {
$context->{interface} = $interface;
} else {
warn "invalid interface : '$interface'";
return $context->{interface} // 'opac';
=head2 C<KOHA_CONF>
Specifies the configuration file to read.
=head1 SEE ALSO
=head1 AUTHORS
Andrew Arensburger <arensb at ooblick dot com>
Joshua Ferraro <jmf at liblime dot com>