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 under the
   7 # terms of the GNU General Public License as published by the Free Software
   8 # Foundation; either version 2 of the License, or (at your option) any later
   9 # version.
  10 #
  11 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
  12 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  13 # A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License along with
  16 # Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  17 # Suite 330, Boston, MA  02111-1307 USA
  18
  19 use strict;
  20 use vars qw($VERSION $AUTOLOAD $context @context_stack);
  21
  22 BEGIN {
  23         if ($ENV{'HTTP_USER_AGENT'})    {
  24                 require CGI::Carp;
  25                 import CGI::Carp qw(fatalsToBrowser);
  26                         sub handle_errors {
  27                                 my $msg = shift;
  28                                 my $debug_level =  C4::Context->preference("DebugLevel");
  29
  30                                 if ($debug_level eq "2"){
  31                                         # debug 2 , print extra info too.
  32                                         my %versions = get_versions();
  33
  34                 # a little example table with various version info";
  35                                         print "
  36                                                 <h1>debug level $debug_level </h1>
  37                                                 <p>Got an error: $msg</p>
  38                                                 <table>
  39                                                 <tr><th>Apache<td>  $versions{apacheVersion}</tr>
  40                                                 <tr><th>Koha<td>    $versions{kohaVersion}</tr>
  41                                                 <tr><th>MySQL<td>   $versions{mysqlVersion}</tr>
  42                                                 <tr><th>OS<td>      $versions{osVersion}</tr>
  43                                                 <tr><th>Perl<td>    $versions{perlVersion}</tr>
  44                                                 </table>";
  45
  46                                 } elsif ($debug_level eq "1"){
  47                                         print "<h1>debug level $debug_level </h1>";
  48                                         print "<p>Got an error: $msg</p>";
  49                                 } else {
  50                                         print "production mode - trapped fatal";
  51                                 }
  52                         }
  53                 CGI::Carp->set_message(\&handle_errors);
  54     }   # else there is no browser to send fatals to!
  55         $VERSION = '3.00.00.036';
  56 }
  57
  58 use DBI;
  59 use ZOOM;
  60 use XML::Simple;
  61 use C4::Boolean;
  62
  63 =head1 NAME
  64
  65 C4::Context - Maintain and manipulate the context of a Koha script
  66
  67 =head1 SYNOPSIS
  68
  69   use C4::Context;
  70
  71   use C4::Context("/path/to/koha-conf.xml");
  72
  73   $config_value = C4::Context->config("config_variable");
  74
  75   $koha_preference = C4::Context->preference("preference");
  76
  77   $db_handle = C4::Context->dbh;
  78
  79   $Zconn = C4::Context->Zconn;
  80
  81   $stopwordhash = C4::Context->stopwords;
  82
  83 =head1 DESCRIPTION
  84
  85 When a Koha script runs, it makes use of a certain number of things:
  86 configuration settings in F</etc/koha/koha-conf.xml>, a connection to the Koha
  87 databases, and so forth. These things make up the I<context> in which
  88 the script runs.
  89
  90 This module takes care of setting up the context for a script:
  91 figuring out which configuration file to load, and loading it, opening
  92 a connection to the right database, and so forth.
  93
  94 Most scripts will only use one context. They can simply have
  95
  96   use C4::Context;
  97
  98 at the top.
  99
 100 Other scripts may need to use several contexts. For instance, if a
 101 library has two databases, one for a certain collection, and the other
 102 for everything else, it might be necessary for a script to use two
 103 different contexts to search both databases. Such scripts should use
 104 the C<&set_context> and C<&restore_context> functions, below.
 105
 106 By default, C4::Context reads the configuration from
 107 F</etc/koha/koha-conf.xml>. This may be overridden by setting the C<$KOHA_CONF>
 108 environment variable to the pathname of a configuration file to use.
 109
 110 =head1 METHODS
 111
 112 =over 2
 113
 114 =cut
 115
 116 #'
 117 # In addition to what is said in the POD above, a Context object is a
 118 # reference-to-hash with the following fields:
 119 #
 120 # config
 121 #    A reference-to-hash whose keys and values are the
 122 #    configuration variables and values specified in the config
 123 #    file (/etc/koha/koha-conf.xml).
 124 # dbh
 125 #    A handle to the appropriate database for this context.
 126 # dbh_stack
 127 #    Used by &set_dbh and &restore_dbh to hold other database
 128 #    handles for this context.
 129 # Zconn
 130 #     A connection object for the Zebra server
 131
 132 # Koha's main configuration file koha-conf.xml
 133 # is searched for according to this priority list:
 134 #
 135 # 1. Path supplied via use C4::Context '/path/to/koha-conf.xml'
 136 # 2. Path supplied in KOHA_CONF environment variable.
 137 # 3. Path supplied in INSTALLED_CONFIG_FNAME, as long
 138 #    as value has changed from its default of
 139 #    '__KOHA_CONF_DIR__/koha-conf.xml', as happens
 140 #    when Koha is installed in 'standard' or 'single'
 141 #    mode.
 142 # 4. Path supplied in CONFIG_FNAME.
 143 #
 144 # The first entry that refers to a readable file is used.
 145
 146 use constant CONFIG_FNAME => "/etc/koha/koha-conf.xml";
 147                 # Default config file, if none is specified
 148
 149 my $INSTALLED_CONFIG_FNAME = '__KOHA_CONF_DIR__/koha-conf.xml';
 150                 # path to config file set by installer
 151                 # __KOHA_CONF_DIR__ is set by rewrite-confg.PL
 152                 # when Koha is installed in 'standard' or 'single'
 153                 # mode.  If Koha was installed in 'dev' mode,
 154                 # __KOHA_CONF_DIR__ is *not* rewritten; instead
 155                 # developers should set the KOHA_CONF environment variable
 156
 157 $context = undef;        # Initially, no context is set
 158 @context_stack = ();        # Initially, no saved contexts
 159
 160
 161 =item KOHAVERSION
 162     returns the kohaversion stored in kohaversion.pl file
 163
 164 =cut
 165
 166 sub KOHAVERSION {
 167     my $cgidir = C4::Context->intranetdir ."/cgi-bin";
 168
 169     # 2 cases here : on CVS install, $cgidir does not need a /cgi-bin
 170     # on a standard install, /cgi-bin need to be added.
 171     # test one, then the other
 172     # FIXME - is this all really necessary?
 173     unless (opendir(DIR, "$cgidir/cataloguing/value_builder")) {
 174         $cgidir = C4::Context->intranetdir;
 175         closedir(DIR);
 176     }
 177
 178     do $cgidir."/kohaversion.pl" || die "NO $cgidir/kohaversion.pl";
 179     return kohaversion();
 180 }
 181 =item read_config_file
 182
 183 =over 4
 184
 185 Reads the specified Koha config file.
 186
 187 Returns an object containing the configuration variables. The object's
 188 structure is a bit complex to the uninitiated ... take a look at the
 189 koha-conf.xml file as well as the XML::Simple documentation for details. Or,
 190 here are a few examples that may give you what you need:
 191
 192 The simple elements nested within the <config> element:
 193
 194     my $pass = $koha->{'config'}->{'pass'};
 195
 196 The <listen> elements:
 197
 198     my $listen = $koha->{'listen'}->{'biblioserver'}->{'content'};
 199
 200 The elements nested within the <server> element:
 201
 202     my $ccl2rpn = $koha->{'server'}->{'biblioserver'}->{'cql2rpn'};
 203
 204 Returns undef in case of error.
 205
 206 =back
 207
 208 =cut
 209
 210 sub read_config_file {          # Pass argument naming config file to read
 211     my $koha = XMLin(shift, keyattr => ['id'], forcearray => ['listen', 'server', 'serverinfo']);
 212     return $koha;                       # Return value: ref-to-hash holding the configuration
 213 }
 214
 215 # db_scheme2dbi
 216 # Translates the full text name of a database into de appropiate dbi name
 217 #
 218 sub db_scheme2dbi {
 219     my $name = shift;
 220
 221     for ($name) {
 222 # FIXME - Should have other databases.
 223         if (/mysql/i) { return("mysql"); }
 224         if (/Postgres|Pg|PostgresSQL/) { return("Pg"); }
 225         if (/oracle/i) { return("Oracle"); }
 226     }
 227     return undef;         # Just in case
 228 }
 229
 230 sub import {
 231     my $package = shift;
 232     my $conf_fname = shift;        # Config file name
 233     my $context;
 234
 235     # Create a new context from the given config file name, if
 236     # any, then set it as the current context.
 237     $context = new C4::Context($conf_fname);
 238     return undef if !defined($context);
 239     $context->set_context;
 240 }
 241
 242 =item new
 243
 244   $context = new C4::Context;
 245   $context = new C4::Context("/path/to/koha-conf.xml");
 246
 247 Allocates a new context. Initializes the context from the specified
 248 file, which defaults to either the file given by the C<$KOHA_CONF>
 249 environment variable, or F</etc/koha/koha-conf.xml>.
 250
 251 C<&new> does not set this context as the new default context; for
 252 that, use C<&set_context>.
 253
 254 =cut
 255
 256 #'
 257 # Revision History:
 258 # 2004-08-10 A. Tarallo: Added check if the conf file is not empty
 259 sub new {
 260     my $class = shift;
 261     my $conf_fname = shift;        # Config file to load
 262     my $self = {};
 263
 264     # check that the specified config file exists and is not empty
 265     undef $conf_fname unless
 266         (defined $conf_fname && -e $conf_fname && -s $conf_fname);
 267     # Figure out a good config file to load if none was specified.
 268     if (!defined($conf_fname))
 269     {
 270         # If the $KOHA_CONF environment variable is set, use
 271         # that. Otherwise, use the built-in default.
 272         if (exists $ENV{"KOHA_CONF"} and $ENV{'KOHA_CONF'} and -e  $ENV{"KOHA_CONF"} and -s  $ENV{"KOHA_CONF"}) {
 273             $conf_fname = $ENV{"KOHA_CONF"};
 274         } elsif ($INSTALLED_CONFIG_FNAME !~ /__KOHA_CONF_DIR/ and -e $INSTALLED_CONFIG_FNAME and -s $INSTALLED_CONFIG_FNAME) {
 275             # NOTE: be careful -- don't change __KOHA_CONF_DIR in the above
 276             # regex to anything else -- don't want installer to rewrite it
 277             $conf_fname = $INSTALLED_CONFIG_FNAME;
 278         } elsif (-e CONFIG_FNAME and -s CONFIG_FNAME) {
 279             $conf_fname = CONFIG_FNAME;
 280         } else {
 281             warn "unable to locate Koha configuration file koha-conf.xml";
 282             return undef;
 283         }
 284     }
 285         # Load the desired config file.
 286     $self = read_config_file($conf_fname);
 287     $self->{"config_file"} = $conf_fname;
 288
 289     warn "read_config_file($conf_fname) returned undef" if !defined($self->{"config"});
 290     return undef if !defined($self->{"config"});
 291
 292     $self->{"dbh"} = undef;        # Database handle
 293     $self->{"Zconn"} = undef;    # Zebra Connections
 294     $self->{"stopwords"} = undef; # stopwords list
 295     $self->{"marcfromkohafield"} = undef; # the hash with relations between koha table fields and MARC field/subfield
 296     $self->{"userenv"} = undef;        # User env
 297     $self->{"activeuser"} = undef;        # current active user
 298     $self->{"shelves"} = undef;
 299
 300     bless $self, $class;
 301     return $self;
 302 }
 303
 304 =item set_context
 305
 306   $context = new C4::Context;
 307   $context->set_context();
 308 or
 309   set_context C4::Context $context;
 310
 311   ...
 312   restore_context C4::Context;
 313
 314 In some cases, it might be necessary for a script to use multiple
 315 contexts. C<&set_context> saves the current context on a stack, then
 316 sets the context to C<$context>, which will be used in future
 317 operations. To restore the previous context, use C<&restore_context>.
 318
 319 =cut
 320
 321 #'
 322 sub set_context
 323 {
 324     my $self = shift;
 325     my $new_context;    # The context to set
 326
 327     # Figure out whether this is a class or instance method call.
 328     #
 329     # We're going to make the assumption that control got here
 330     # through valid means, i.e., that the caller used an instance
 331     # or class method call, and that control got here through the
 332     # usual inheritance mechanisms. The caller can, of course,
 333     # break this assumption by playing silly buggers, but that's
 334     # harder to do than doing it properly, and harder to check
 335     # for.
 336     if (ref($self) eq "")
 337     {
 338         # Class method. The new context is the next argument.
 339         $new_context = shift;
 340     } else {
 341         # Instance method. The new context is $self.
 342         $new_context = $self;
 343     }
 344
 345     # Save the old context, if any, on the stack
 346     push @context_stack, $context if defined($context);
 347
 348     # Set the new context
 349     $context = $new_context;
 350 }
 351
 352 =item restore_context
 353
 354   &restore_context;
 355
 356 Restores the context set by C<&set_context>.
 357
 358 =cut
 359
 360 #'
 361 sub restore_context
 362 {
 363     my $self = shift;
 364
 365     if ($#context_stack < 0)
 366     {
 367         # Stack underflow.
 368         die "Context stack underflow";
 369     }
 370
 371     # Pop the old context and set it.
 372     $context = pop @context_stack;
 373
 374     # FIXME - Should this return something, like maybe the context
 375     # that was current when this was called?
 376 }
 377
 378 =item config
 379
 380   $value = C4::Context->config("config_variable");
 381
 382   $value = C4::Context->config_variable;
 383
 384 Returns the value of a variable specified in the configuration file
 385 from which the current context was created.
 386
 387 The second form is more compact, but of course may conflict with
 388 method names. If there is a configuration variable called "new", then
 389 C<C4::Config-E<gt>new> will not return it.
 390
 391 =cut
 392
 393 sub _common_config ($$) {
 394         my $var = shift;
 395         my $term = shift;
 396     return undef if !defined($context->{$term});
 397        # Presumably $self->{$term} might be
 398        # undefined if the config file given to &new
 399        # didn't exist, and the caller didn't bother
 400        # to check the return value.
 401
 402     # Return the value of the requested config variable
 403     return $context->{$term}->{$var};
 404 }
 405
 406 sub config {
 407         return _common_config($_[1],'config');
 408 }
 409 sub zebraconfig {
 410         return _common_config($_[1],'server');
 411 }
 412 sub ModZebrations {
 413         return _common_config($_[1],'serverinfo');
 414 }
 415
 416 =item preference
 417
 418   $sys_preference = C4::Context->preference("some_variable");
 419
 420 Looks up the value of the given system preference in the
 421 systempreferences table of the Koha database, and returns it. If the
 422 variable is not set, or in case of error, returns the undefined value.
 423
 424 =cut
 425
 426 #'
 427 # FIXME - The preferences aren't likely to change over the lifetime of
 428 # the script (and things might break if they did change), so perhaps
 429 # this function should cache the results it finds.
 430 sub preference
 431 {
 432     my $self = shift;
 433     my $var = shift;        # The system preference to return
 434     my $retval;            # Return value
 435     my $dbh = C4::Context->dbh or return 0;
 436     # Look up systempreferences.variable==$var
 437     $retval = $dbh->selectrow_array(<<EOT);
 438         SELECT    value
 439         FROM    systempreferences
 440         WHERE    variable='$var'
 441         LIMIT    1
 442 EOT
 443     return $retval;
 444 }
 445
 446 sub boolean_preference ($) {
 447     my $self = shift;
 448     my $var = shift;        # The system preference to return
 449     my $it = preference($self, $var);
 450     return defined($it)? C4::Boolean::true_p($it): undef;
 451 }
 452
 453 # AUTOLOAD
 454 # This implements C4::Config->foo, and simply returns
 455 # C4::Context->config("foo"), as described in the documentation for
 456 # &config, above.
 457
 458 # FIXME - Perhaps this should be extended to check &config first, and
 459 # then &preference if that fails. OTOH, AUTOLOAD could lead to crappy
 460 # code, so it'd probably be best to delete it altogether so as not to
 461 # encourage people to use it.
 462 sub AUTOLOAD
 463 {
 464     my $self = shift;
 465
 466     $AUTOLOAD =~ s/.*:://;        # Chop off the package name,
 467                     # leaving only the function name.
 468     return $self->config($AUTOLOAD);
 469 }
 470
 471 =item Zconn
 472
 473 $Zconn = C4::Context->Zconn
 474
 475 Returns a connection to the Zebra database for the current
 476 context. If no connection has yet been made, this method
 477 creates one and connects.
 478
 479 C<$self>
 480
 481 C<$server> one of the servers defined in the koha-conf.xml file
 482
 483 C<$async> whether this is a asynchronous connection
 484
 485 C<$auth> whether this connection has rw access (1) or just r access (0 or NULL)
 486
 487
 488 =cut
 489
 490 sub Zconn {
 491     my $self=shift;
 492     my $server=shift;
 493     my $async=shift;
 494     my $auth=shift;
 495     my $piggyback=shift;
 496     my $syntax=shift;
 497     if ( defined($context->{"Zconn"}->{$server}) ) {
 498         return $context->{"Zconn"}->{$server};
 499     # No connection object or it died. Create one.
 500     }else {
 501         $context->{"Zconn"}->{$server} = &_new_Zconn($server,$async,$auth,$piggyback,$syntax);
 502         return $context->{"Zconn"}->{$server};
 503     }
 504 }
 505
 506 =item _new_Zconn
 507
 508 $context->{"Zconn"} = &_new_Zconn($server,$async);
 509
 510 Internal function. Creates a new database connection from the data given in the current context and returns it.
 511
 512 C<$server> one of the servers defined in the koha-conf.xml file
 513
 514 C<$async> whether this is a asynchronous connection
 515
 516 C<$auth> whether this connection has rw access (1) or just r access (0 or NULL)
 517
 518 =cut
 519
 520 sub _new_Zconn {
 521     my ($server,$async,$auth,$piggyback,$syntax) = @_;
 522
 523     my $tried=0; # first attempt
 524     my $Zconn; # connection object
 525     $server = "biblioserver" unless $server;
 526     $syntax = "usmarc" unless $syntax;
 527
 528     my $host = $context->{'listen'}->{$server}->{'content'};
 529     my $servername = $context->{"config"}->{$server};
 530     my $user = $context->{"serverinfo"}->{$server}->{"user"};
 531     my $password = $context->{"serverinfo"}->{$server}->{"password"};
 532  $auth = 1 if($user && $password);
 533     retry:
 534     eval {
 535         # set options
 536         my $o = new ZOOM::Options();
 537         $o->option(user=>$user) if $auth;
 538         $o->option(password=>$password) if $auth;
 539         $o->option(async => 1) if $async;
 540         $o->option(count => $piggyback) if $piggyback;
 541         $o->option(cqlfile=> $context->{"server"}->{$server}->{"cql2rpn"});
 542         $o->option(cclfile=> $context->{"serverinfo"}->{$server}->{"ccl2rpn"});
 543         $o->option(preferredRecordSyntax => $syntax);
 544         $o->option(elementSetName => "F"); # F for 'full' as opposed to B for 'brief'
 545         $o->option(databaseName => ($servername?$servername:"biblios"));
 546
 547         # create a new connection object
 548         $Zconn= create ZOOM::Connection($o);
 549
 550         # forge to server
 551         $Zconn->connect($host, 0);
 552
 553         # check for errors and warn
 554         if ($Zconn->errcode() !=0) {
 555             warn "something wrong with the connection: ". $Zconn->errmsg();
 556         }
 557
 558     };
 559 #     if ($@) {
 560 #         # Koha manages the Zebra server -- this doesn't work currently for me because of permissions issues
 561 #         # Also, I'm skeptical about whether it's the best approach
 562 #         warn "problem with Zebra";
 563 #         if ( C4::Context->preference("ManageZebra") ) {
 564 #             if ($@->code==10000 && $tried==0) { ##No connection try restarting Zebra
 565 #                 $tried=1;
 566 #                 warn "trying to restart Zebra";
 567 #                 my $res=system("zebrasrv -f $ENV{'KOHA_CONF'} >/koha/log/zebra-error.log");
 568 #                 goto "retry";
 569 #             } else {
 570 #                 warn "Error ", $@->code(), ": ", $@->message(), "\n";
 571 #                 $Zconn="error";
 572 #                 return $Zconn;
 573 #             }
 574 #         }
 575 #     }
 576     return $Zconn;
 577 }
 578
 579 # _new_dbh
 580 # Internal helper function (not a method!). This creates a new
 581 # database connection from the data given in the current context, and
 582 # returns it.
 583 sub _new_dbh
 584 {
 585
 586 ### $context
 587     ##correct name for db_schme
 588     my $db_driver;
 589     if ($context->config("db_scheme")){
 590     $db_driver=db_scheme2dbi($context->config("db_scheme"));
 591     }else{
 592     $db_driver="mysql";
 593     }
 594
 595     my $db_name   = $context->config("database");
 596     my $db_host   = $context->config("hostname");
 597     my $db_port   = $context->config("port");
 598     $db_port = "" unless defined $db_port;
 599     my $db_user   = $context->config("user");
 600     my $db_passwd = $context->config("pass");
 601     # MJR added or die here, as we can't work without dbh
 602     my $dbh= DBI->connect("DBI:$db_driver:dbname=$db_name;host=$db_host;port=$db_port",
 603          $db_user, $db_passwd) or die $DBI::errstr;
 604     if ( $db_driver eq 'mysql' ) {
 605         # Koha 3.0 is utf-8, so force utf8 communication between mySQL and koha, whatever the mysql default config.
 606         # this is better than modifying my.cnf (and forcing all communications to be in utf8)
 607         $dbh->{'mysql_enable_utf8'}=1; #enable
 608         $dbh->do("set NAMES 'utf8'");
 609     }
 610     elsif ( $db_driver eq 'Pg' ) {
 611             $dbh->do( "set client_encoding = 'UTF8';" );
 612     }
 613     return $dbh;
 614 }
 615
 616 =item dbh
 617
 618   $dbh = C4::Context->dbh;
 619
 620 Returns a database handle connected to the Koha database for the
 621 current context. If no connection has yet been made, this method
 622 creates one, and connects to the database.
 623
 624 This database handle is cached for future use: if you call
 625 C<C4::Context-E<gt>dbh> twice, you will get the same handle both
 626 times. If you need a second database handle, use C<&new_dbh> and
 627 possibly C<&set_dbh>.
 628
 629 =cut
 630
 631 #'
 632 sub dbh
 633 {
 634     my $self = shift;
 635     my $sth;
 636
 637     if (defined($context->{"dbh"})) {
 638         $sth=$context->{"dbh"}->prepare("select 1");
 639         return $context->{"dbh"} if (defined($sth->execute));
 640     }
 641
 642     # No database handle or it died . Create one.
 643     $context->{"dbh"} = &_new_dbh();
 644
 645     return $context->{"dbh"};
 646 }
 647
 648 =item new_dbh
 649
 650   $dbh = C4::Context->new_dbh;
 651
 652 Creates a new connection to the Koha database for the current context,
 653 and returns the database handle (a C<DBI::db> object).
 654
 655 The handle is not saved anywhere: this method is strictly a
 656 convenience function; the point is that it knows which database to
 657 connect to so that the caller doesn't have to know.
 658
 659 =cut
 660
 661 #'
 662 sub new_dbh
 663 {
 664     my $self = shift;
 665
 666     return &_new_dbh();
 667 }
 668
 669 =item set_dbh
 670
 671   $my_dbh = C4::Connect->new_dbh;
 672   C4::Connect->set_dbh($my_dbh);
 673   ...
 674   C4::Connect->restore_dbh;
 675
 676 C<&set_dbh> and C<&restore_dbh> work in a manner analogous to
 677 C<&set_context> and C<&restore_context>.
 678
 679 C<&set_dbh> saves the current database handle on a stack, then sets
 680 the current database handle to C<$my_dbh>.
 681
 682 C<$my_dbh> is assumed to be a good database handle.
 683
 684 =cut
 685
 686 #'
 687 sub set_dbh
 688 {
 689     my $self = shift;
 690     my $new_dbh = shift;
 691
 692     # Save the current database handle on the handle stack.
 693     # We assume that $new_dbh is all good: if the caller wants to
 694     # screw himself by passing an invalid handle, that's fine by
 695     # us.
 696     push @{$context->{"dbh_stack"}}, $context->{"dbh"};
 697     $context->{"dbh"} = $new_dbh;
 698 }
 699
 700 =item restore_dbh
 701
 702   C4::Context->restore_dbh;
 703
 704 Restores the database handle saved by an earlier call to
 705 C<C4::Context-E<gt>set_dbh>.
 706
 707 =cut
 708
 709 #'
 710 sub restore_dbh
 711 {
 712     my $self = shift;
 713
 714     if ($#{$context->{"dbh_stack"}} < 0)
 715     {
 716         # Stack underflow
 717         die "DBH stack underflow";
 718     }
 719
 720     # Pop the old database handle and set it.
 721     $context->{"dbh"} = pop @{$context->{"dbh_stack"}};
 722
 723     # FIXME - If it is determined that restore_context should
 724     # return something, then this function should, too.
 725 }
 726
 727 =item marcfromkohafield
 728
 729   $dbh = C4::Context->marcfromkohafield;
 730
 731 Returns a hash with marcfromkohafield.
 732
 733 This hash is cached for future use: if you call
 734 C<C4::Context-E<gt>marcfromkohafield> twice, you will get the same hash without real DB access
 735
 736 =cut
 737
 738 #'
 739 sub marcfromkohafield
 740 {
 741     my $retval = {};
 742
 743     # If the hash already exists, return it.
 744     return $context->{"marcfromkohafield"} if defined($context->{"marcfromkohafield"});
 745
 746     # No hash. Create one.
 747     $context->{"marcfromkohafield"} = &_new_marcfromkohafield();
 748
 749     return $context->{"marcfromkohafield"};
 750 }
 751
 752 # _new_marcfromkohafield
 753 # Internal helper function (not a method!). This creates a new
 754 # hash with stopwords
 755 sub _new_marcfromkohafield
 756 {
 757     my $dbh = C4::Context->dbh;
 758     my $marcfromkohafield;
 759     my $sth = $dbh->prepare("select frameworkcode,kohafield,tagfield,tagsubfield from marc_subfield_structure where kohafield > ''");
 760     $sth->execute;
 761     while (my ($frameworkcode,$kohafield,$tagfield,$tagsubfield) = $sth->fetchrow) {
 762         my $retval = {};
 763         $marcfromkohafield->{$frameworkcode}->{$kohafield} = [$tagfield,$tagsubfield];
 764     }
 765     return $marcfromkohafield;
 766 }
 767
 768 =item stopwords
 769
 770   $dbh = C4::Context->stopwords;
 771
 772 Returns a hash with stopwords.
 773
 774 This hash is cached for future use: if you call
 775 C<C4::Context-E<gt>stopwords> twice, you will get the same hash without real DB access
 776
 777 =cut
 778
 779 #'
 780 sub stopwords
 781 {
 782     my $retval = {};
 783
 784     # If the hash already exists, return it.
 785     return $context->{"stopwords"} if defined($context->{"stopwords"});
 786
 787     # No hash. Create one.
 788     $context->{"stopwords"} = &_new_stopwords();
 789
 790     return $context->{"stopwords"};
 791 }
 792
 793 # _new_stopwords
 794 # Internal helper function (not a method!). This creates a new
 795 # hash with stopwords
 796 sub _new_stopwords
 797 {
 798     my $dbh = C4::Context->dbh;
 799     my $stopwordlist;
 800     my $sth = $dbh->prepare("select word from stopwords");
 801     $sth->execute;
 802     while (my $stopword = $sth->fetchrow_array) {
 803         my $retval = {};
 804         $stopwordlist->{$stopword} = uc($stopword);
 805     }
 806     $stopwordlist->{A} = "A" unless $stopwordlist;
 807     return $stopwordlist;
 808 }
 809
 810 =item userenv
 811
 812   C4::Context->userenv;
 813
 814 Builds a hash for user environment variables.
 815
 816 This hash shall be cached for future use: if you call
 817 C<C4::Context-E<gt>userenv> twice, you will get the same hash without real DB access
 818
 819 set_userenv is called in Auth.pm
 820
 821 =cut
 822
 823 #'
 824 sub userenv
 825 {
 826     my $var = $context->{"activeuser"};
 827     return $context->{"userenv"}->{$var} if (defined $context->{"userenv"}->{$var});
 828     # insecure=1 management
 829     if ($context->{"dbh"} && $context->preference('insecure')) {
 830         my %insecure;
 831         $insecure{flags} = '16382';
 832         $insecure{branchname} ='Insecure';
 833         $insecure{number} ='0';
 834         $insecure{cardnumber} ='0';
 835         $insecure{id} = 'insecure';
 836         $insecure{branch} = 'INS';
 837         $insecure{emailaddress} = 'test@mode.insecure.com';
 838         return \%insecure;
 839     } else {
 840         return 0;
 841     }
 842 }
 843
 844 =item set_userenv
 845
 846   C4::Context->set_userenv($usernum, $userid, $usercnum, $userfirstname, $usersurname, $userbranch, $userflags, $emailaddress);
 847
 848 Informs a hash for user environment variables.
 849
 850 This hash shall be cached for future use: if you call
 851 C<C4::Context-E<gt>userenv> twice, you will get the same hash without real DB access
 852
 853 set_userenv is called in Auth.pm
 854
 855 =cut
 856
 857 #'
 858 sub set_userenv{
 859     my ($usernum, $userid, $usercnum, $userfirstname, $usersurname, $userbranch, $branchname, $userflags, $emailaddress, $branchprinter)= @_;
 860     my $var=$context->{"activeuser"};
 861     my $cell = {
 862         "number"     => $usernum,
 863         "id"         => $userid,
 864         "cardnumber" => $usercnum,
 865         "firstname"  => $userfirstname,
 866         "surname"    => $usersurname,
 867 #possibly a law problem
 868         "branch"     => $userbranch,
 869         "branchname" => $branchname,
 870         "flags"      => $userflags,
 871         "emailaddress"    => $emailaddress,
 872                 "branchprinter"    => $branchprinter
 873     };
 874     $context->{userenv}->{$var} = $cell;
 875     return $cell;
 876 }
 877
 878 sub set_shelves_userenv ($) {
 879         my $lists = shift or return undef;
 880         my $activeuser = $context->{activeuser} or return undef;
 881         $context->{userenv}->{$activeuser}->{shelves} = $lists;
 882         # die "set_shelves_userenv: $lists";
 883 }
 884 sub get_shelves_userenv () {
 885         my $active;
 886         unless ($active = $context->{userenv}->{$context->{activeuser}}) {
 887                 warn "get_shelves_userenv cannot retrieve context->{userenv}->{context->{activeuser}}";
 888                 return undef;
 889         }
 890         my $lists = $active->{shelves} or return undef;#  die "get_shelves_userenv: activeenv has no ->{shelves}";
 891         return $lists;
 892 }
 893
 894 =item _new_userenv
 895
 896   C4::Context->_new_userenv($session);
 897
 898 Builds a hash for user environment variables.
 899
 900 This hash shall be cached for future use: if you call
 901 C<C4::Context-E<gt>userenv> twice, you will get the same hash without real DB access
 902
 903 _new_userenv is called in Auth.pm
 904
 905 =cut
 906
 907 #'
 908 sub _new_userenv
 909 {
 910     shift;
 911     my ($sessionID)= @_;
 912      $context->{"activeuser"}=$sessionID;
 913 }
 914
 915 =item _unset_userenv
 916
 917   C4::Context->_unset_userenv;
 918
 919 Destroys the hash for activeuser user environment variables.
 920
 921 =cut
 922
 923 #'
 924
 925 sub _unset_userenv
 926 {
 927     my ($sessionID)= @_;
 928     undef $context->{"activeuser"} if ($context->{"activeuser"} eq $sessionID);
 929 }
 930
 931
 932 =item get_versions
 933
 934   C4::Context->get_versions
 935
 936 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'.
 937
 938 =cut
 939
 940 #'
 941
 942 # A little example sub to show more debugging info for CGI::Carp
 943 sub get_versions {
 944     my %versions;
 945     $versions{kohaVersion}  = C4::Context->config("kohaversion");
 946     $versions{osVersion} = `uname -a`;
 947     $versions{perlVersion} = $];
 948     $versions{mysqlVersion} = `mysql -V`;
 949     $versions{apacheVersion} =  `httpd -v`;
 950     $versions{apacheVersion} =  `httpd2 -v`            unless  $versions{apacheVersion} ;
 951     $versions{apacheVersion} =  `apache2 -v`           unless  $versions{apacheVersion} ;
 952     $versions{apacheVersion} =  `/usr/sbin/apache2 -v` unless  $versions{apacheVersion} ;
 953     return %versions;
 954 }
 955
 956
 957 1;
 958 __END__
 959
 960 =back
 961
 962 =head1 ENVIRONMENT
 963
 964 =over 4
 965
 966 =item C<KOHA_CONF>
 967
 968 Specifies the configuration file to read.
 969
 970 =back
 971
 972 =head1 SEE ALSO
 973
 974 XML::Simple
 975
 976 =head1 AUTHORS
 977
 978 Andrew Arensburger <arensb at ooblick dot com>
 979
 980 Joshua Ferraro <jmf at liblime dot com>
 981
 982 =cut
 983
 984 # Revision 1.57  2007/05/22 09:13:55  tipaul
 985 # Bugfixes & improvements (various and minor) :
 986 # - updating templates to have tmpl_process3.pl running without any errors
 987 # - adding a drupal-like css for prog templates (with 3 small images)
 988 # - fixing some bugs in circulation & other scripts
 989 # - updating french translation
 990 # - fixing some typos in templates
 991 #
 992 # Revision 1.56  2007/04/23 15:21:17  tipaul
 993 # renaming currenttransfers to transferstoreceive
 994 #
 995 # Revision 1.55  2007/04/17 08:48:00  tipaul
 996 # circulation cleaning continued: bufixing
 997 #
 998 # Revision 1.54  2007/03/29 16:45:53  tipaul
 999 # Code cleaning of Biblio.pm (continued)
1000 #
1001 # All subs have be cleaned :
1002 # - removed useless
1003 # - merged some
1004 # - reordering Biblio.pm completly
1005 # - using only naming conventions
1006 #
1007 # Seems to have broken nothing, but it still has to be heavily tested.
1008 # Note that Biblio.pm is now much more efficient than previously & probably more reliable as well.
1009 #
1010 # Revision 1.53  2007/03/29 13:30:31  tipaul
1011 # Code cleaning :
1012 # == Biblio.pm cleaning (useless) ==
1013 # * some sub declaration dropped
1014 # * removed modbiblio sub
1015 # * removed moditem sub
1016 # * removed newitems. It was used only in finishrecieve. Replaced by a TransformKohaToMarc+AddItem, that is better.
1017 # * removed MARCkoha2marcItem
1018 # * removed MARCdelsubfield declaration
1019 # * removed MARCkoha2marcBiblio
1020 #
1021 # == Biblio.pm cleaning (naming conventions) ==
1022 # * MARCgettagslib renamed to GetMarcStructure
1023 # * MARCgetitems renamed to GetMarcItem
1024 # * MARCfind_frameworkcode renamed to GetFrameworkCode
1025 # * MARCmarc2koha renamed to TransformMarcToKoha
1026 # * MARChtml2marc renamed to TransformHtmlToMarc
1027 # * MARChtml2xml renamed to TranformeHtmlToXml
1028 # * zebraop renamed to ModZebra
1029 #
1030 # == MARC=OFF ==
1031 # * removing MARC=OFF related scripts (in cataloguing directory)
1032 # * removed checkitems (function related to MARC=off feature, that is completly broken in head. If someone want to reintroduce it, hard work coming...)
1033 # * removed getitemsbybiblioitem (used only by MARC=OFF scripts, that is removed as well)
1034 #
1035 # Revision 1.52  2007/03/16 01:25:08  kados
1036 # Using my precrash CVS copy I did the following:
1037 #
1038 # cvs -z3 -d:ext:kados@cvs.savannah.nongnu.org:/sources/koha co -P koha
1039 # find koha.precrash -type d -name "CVS" -exec rm -v {} \;
1040 # cp -r koha.precrash/* koha/
1041 # cd koha/
1042 # cvs commit
1043 #
1044 # This should in theory put us right back where we were before the crash
1045 #
1046 # Revision 1.52  2007/03/12 21:17:05  rych
1047 # add server, serverinfo as arrays from config
1048 #
1049 # Revision 1.51  2007/03/09 14:31:47  tipaul
1050 # rel_3_0 moved to HEAD
1051 #
1052 # Revision 1.43.2.10  2007/02/09 17:17:56  hdl
1053 # Managing a little better database absence.
1054 # (preventing from BIG 550)
1055 #
1056 # Revision 1.43.2.9  2006/12/20 16:50:48  tipaul
1057 # improving "insecure" management
1058 #
1059 # WARNING KADOS :
1060 # you told me that you had some libraries with insecure=ON (behind a firewall).
1061 # In this commit, I created a "fake" user when insecure=ON. It has a fake branch. You may find better to have the 1st branch in branch table instead of a fake one.
1062 #
1063 # Revision 1.43.2.8  2006/12/19 16:48:16  alaurin
1064 # reident programs, and adding branchcode value in reserves
1065 #
1066 # Revision 1.43.2.7  2006/12/06 21:55:38  hdl
1067 # Adding ModZebrations for servers to get serverinfos in Context.pm
1068 # Using this function in rebuild_zebra.pl
1069 #
1070 # Revision 1.43.2.6  2006/11/24 21:18:31  kados
1071 # very minor changes, no functional ones, just comments, etc.
1072 #
1073 # Revision 1.43.2.5  2006/10/30 13:24:16  toins
1074 # fix some minor POD error.
1075 #
1076 # Revision 1.43.2.4  2006/10/12 21:42:49  hdl
1077 # Managing multiple zebra connections
1078 #
1079 # Revision 1.43.2.3  2006/10/11 14:27:26  tipaul
1080 # removing a warning
1081 #
1082 # Revision 1.43.2.2  2006/10/10 15:28:16  hdl
1083 # BUG FIXING : using database name in Zconn if defined and not hard coded value
1084 #
1085 # Revision 1.43.2.1  2006/10/06 13:47:28  toins
1086 # Synch with dev_week.
1087 #  /!\ WARNING :: Please now use the new version of koha.xml.
1088 #
1089 # Revision 1.18.2.5.2.14  2006/09/24 15:24:06  kados
1090 # remove Zebraauth routine, fold the functionality into Zconn
1091 # Zconn can now take several arguments ... this will probably
1092 # change soon as I'm not completely happy with the readability
1093 # of the current format ... see the POD for details.
1094 #
1095 # cleaning up Biblio.pm, removing unnecessary routines.
1096 #
1097 # DeleteBiblio - used to delete a biblio from zebra and koha tables
1098 #     -- checks to make sure there are no existing issues
1099 #     -- saves backups of biblio,biblioitems,items in deleted* tables
1100 #     -- does commit operation
1101 #
1102 # getRecord - used to retrieve one record from zebra in piggyback mode using biblionumber
1103 # brought back z3950_extended_services routine
1104 #
1105 # Lots of modifications to Context.pm, you can now store user and pass info for
1106 # multiple servers (for federated searching) using the <serverinfo> element.
1107 # I'll commit my koha.xml to demonstrate this or you can refer to the POD in
1108 # Context.pm (which I also expanded on).
1109 #
1110 # Revision 1.18.2.5.2.13  2006/08/10 02:10:21  kados
1111 # Turned warnings on, and running a search turned up lots of warnings.
1112 # Cleaned up those ...
1113 #
1114 # removed getitemtypes from Koha.pm (one in Search.pm looks newer)
1115 # removed itemcount from Biblio.pm
1116 #
1117 # made some local subs local with a _ prefix (as they were redefined
1118 # elsewhere)
1119 #
1120 # Add two new search subs to Search.pm the start of a new search API
1121 # that's a bit more scalable
1122 #
1123 # Revision 1.18.2.5.2.10  2006/07/21 17:50:51  kados
1124 # moving the *.properties files to intranetdir/etc dir
1125 #
1126 # Revision 1.18.2.5.2.9  2006/07/17 08:05:20  tipaul
1127 # there was a hardcoded link to /koha/etc/ I replaced it with intranetdir config value
1128 #
1129 # Revision 1.18.2.5.2.8  2006/07/11 12:20:37  kados
1130 # adding ccl and cql files ... Tumer, if you want to fit these into the
1131 # config file by all means do.
1132 #
1133 # Revision 1.18.2.5.2.7  2006/06/04 22:50:33  tgarip1957
1134 # We do not hard code cql2rpn conversion file in context.pm our koha.xml configuration file already describes the path for this file.
1135 # At cql searching we use method CQL not CQL2RPN as the cql2rpn conversion file is defined at server level
1136 #
1137 # Revision 1.18.2.5.2.6  2006/06/02 23:11:24  kados
1138 # Committing my working dev_week. It's been tested only with
1139 # searching, and there's quite a lot of config stuff to set up
1140 # beforehand. As things get closer to a release, we'll be making
1141 # some scripts to do it for us
1142 #
1143 # Revision 1.18.2.5.2.5  2006/05/28 18:49:12  tgarip1957
1144 # This is an unusual commit. The main purpose is a working model of Zebra on a modified rel2_2.
1145 # Any questions regarding these commits should be asked to Joshua Ferraro unless you are Joshua whom I'll report to
1146 #
1147 # Revision 1.36  2006/05/09 13:28:08  tipaul
1148 # adding the branchname and the librarian name in every page :
1149 # - modified userenv to add branchname
1150 # - modifier menus.inc to have the librarian name & userenv displayed on every page. they are in a librarian_information div.
1151 #
1152 # Revision 1.35  2006/04/13 08:40:11  plg
1153 # bug fixed: typo on Zconnauth name
1154 #
1155 # Revision 1.34  2006/04/10 21:40:23  tgarip1957
1156 # A new handler defined for zebra Zconnauth with read/write permission. Zconnauth should only be called in biblio.pm where write operations are. Use of this handler will break things unless koha.conf contains new variables:
1157 # zebradb=localhost
1158 # zebraport=<your port>
1159 # zebrauser=<username>
1160 # zebrapass=<password>
1161 #
1162 # The zebra.cfg file should read:
1163 # perm.anonymous:r
1164 # perm.username:rw
1165 # passw.c:<yourpasswordfile>
1166 #
1167 # Password file should be prepared with Apaches htpasswd utility in encrypted mode and should exist in a folder zebra.cfg can read
1168 #
1169 # Revision 1.33  2006/03/15 11:21:56  plg
1170 # bug fixed: utf-8 data where not displayed correctly in screens. Supposing
1171 # your data are truely utf-8 encoded in your database, they should be
1172 # correctly displayed. "set names 'UTF8'" on mysql connection (C4/Context.pm)
1173 # is mandatory and "binmode" to utf8 (C4/Interface/CGI/Output.pm) seemed to
1174 # converted data twice, so it was removed.
1175 #
1176 # Revision 1.32  2006/03/03 17:25:01  hdl
1177 # Bug fixing : a line missed a comment sign.
1178 #
1179 # Revision 1.31  2006/03/03 16:45:36  kados
1180 # Remove the search that tests the Zconn -- warning, still no fault
1181 # tollerance
1182 #
1183 # Revision 1.30  2006/02/22 00:56:59  kados
1184 # First go at a connection object for Zebra. You can now get a
1185 # connection object by doing:
1186 #
1187 # my $Zconn = C4::Context->Zconn;
1188 #
1189 # My initial tests indicate that as soon as your funcion ends
1190 # (ie, when you're done doing something) the connection will be
1191 # closed automatically. There may be some other way to make the
1192 # connection more stateful, I'm not sure...
1193 #
1194 # Local Variables:
1195 # tab-width: 4
1196 # End: