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         # 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 $debug_level =  C4::Context->preference("DebugLevel");
  31
  32                 print q(<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  33                             "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  34                        <html lang="en" xml:lang="en"  xmlns="http://www.w3.org/1999/xhtml">
  35                        <head><title>Koha Error</title></head>
  36                        <body>
  37                 );
  38                                 if ($debug_level eq "2"){
  39                                         # debug 2 , print extra info too.
  40                                         my %versions = get_versions();
  41
  42                 # a little example table with various version info";
  43                                         print "
  44                                                 <h1>Koha error</h1>
  45                                                 <p>The following fatal error has occurred:</p>
  46                         <pre><code>$msg</code></pre>
  47                                                 <table>
  48                                                 <tr><th>Apache</th><td>  $versions{apacheVersion}</td></tr>
  49                                                 <tr><th>Koha</th><td>    $versions{kohaVersion}</td></tr>
  50                                                 <tr><th>Koha DB</th><td> $versions{kohaDbVersion}</td></tr>
  51                                                 <tr><th>MySQL</th><td>   $versions{mysqlVersion}</td></tr>
  52                                                 <tr><th>OS</th><td>      $versions{osVersion}</td></tr>
  53                                                 <tr><th>Perl</th><td>    $versions{perlVersion}</td></tr>
  54                                                 </table>";
  55
  56                                 } elsif ($debug_level eq "1"){
  57                                         print "
  58                                                 <h1>Koha error</h1>
  59                                                 <p>The following fatal error has occurred:</p>
  60                         <pre><code>$msg</code></pre>";
  61                                 } else {
  62                                         print "<p>production mode - trapped fatal error</p>";
  63                                 }
  64                 print "</body></html>";
  65                         }
  66                 CGI::Carp::set_message(\&handle_errors);
  67                 ## give a stack backtrace if KOHA_BACKTRACES is set
  68                 ## can't rely on DebugLevel for this, as we're not yet connected
  69                 if ($ENV{KOHA_BACKTRACES}) {
  70                         $main::SIG{__DIE__} = \&CGI::Carp::confess;
  71                 }
  72     }   # else there is no browser to send fatals to!
  73         $VERSION = '3.00.00.036';
  74 }
  75
  76 use DBI;
  77 use ZOOM;
  78 use XML::Simple;
  79 use C4::Boolean;
  80
  81 =head1 NAME
  82
  83 C4::Context - Maintain and manipulate the context of a Koha script
  84
  85 =head1 SYNOPSIS
  86
  87   use C4::Context;
  88
  89   use C4::Context("/path/to/koha-conf.xml");
  90
  91   $config_value = C4::Context->config("config_variable");
  92
  93   $koha_preference = C4::Context->preference("preference");
  94
  95   $db_handle = C4::Context->dbh;
  96
  97   $Zconn = C4::Context->Zconn;
  98
  99   $stopwordhash = C4::Context->stopwords;
 100
 101 =head1 DESCRIPTION
 102
 103 When a Koha script runs, it makes use of a certain number of things:
 104 configuration settings in F</etc/koha/koha-conf.xml>, a connection to the Koha
 105 databases, and so forth. These things make up the I<context> in which
 106 the script runs.
 107
 108 This module takes care of setting up the context for a script:
 109 figuring out which configuration file to load, and loading it, opening
 110 a connection to the right database, and so forth.
 111
 112 Most scripts will only use one context. They can simply have
 113
 114   use C4::Context;
 115
 116 at the top.
 117
 118 Other scripts may need to use several contexts. For instance, if a
 119 library has two databases, one for a certain collection, and the other
 120 for everything else, it might be necessary for a script to use two
 121 different contexts to search both databases. Such scripts should use
 122 the C<&set_context> and C<&restore_context> functions, below.
 123
 124 By default, C4::Context reads the configuration from
 125 F</etc/koha/koha-conf.xml>. This may be overridden by setting the C<$KOHA_CONF>
 126 environment variable to the pathname of a configuration file to use.
 127
 128 =head1 METHODS
 129
 130 =over 2
 131
 132 =cut
 133
 134 #'
 135 # In addition to what is said in the POD above, a Context object is a
 136 # reference-to-hash with the following fields:
 137 #
 138 # config
 139 #    A reference-to-hash whose keys and values are the
 140 #    configuration variables and values specified in the config
 141 #    file (/etc/koha/koha-conf.xml).
 142 # dbh
 143 #    A handle to the appropriate database for this context.
 144 # dbh_stack
 145 #    Used by &set_dbh and &restore_dbh to hold other database
 146 #    handles for this context.
 147 # Zconn
 148 #     A connection object for the Zebra server
 149
 150 # Koha's main configuration file koha-conf.xml
 151 # is searched for according to this priority list:
 152 #
 153 # 1. Path supplied via use C4::Context '/path/to/koha-conf.xml'
 154 # 2. Path supplied in KOHA_CONF environment variable.
 155 # 3. Path supplied in INSTALLED_CONFIG_FNAME, as long
 156 #    as value has changed from its default of
 157 #    '__KOHA_CONF_DIR__/koha-conf.xml', as happens
 158 #    when Koha is installed in 'standard' or 'single'
 159 #    mode.
 160 # 4. Path supplied in CONFIG_FNAME.
 161 #
 162 # The first entry that refers to a readable file is used.
 163
 164 use constant CONFIG_FNAME => "/etc/koha/koha-conf.xml";
 165                 # Default config file, if none is specified
 166
 167 my $INSTALLED_CONFIG_FNAME = '__KOHA_CONF_DIR__/koha-conf.xml';
 168                 # path to config file set by installer
 169                 # __KOHA_CONF_DIR__ is set by rewrite-confg.PL
 170                 # when Koha is installed in 'standard' or 'single'
 171                 # mode.  If Koha was installed in 'dev' mode,
 172                 # __KOHA_CONF_DIR__ is *not* rewritten; instead
 173                 # developers should set the KOHA_CONF environment variable
 174
 175 $context = undef;        # Initially, no context is set
 176 @context_stack = ();        # Initially, no saved contexts
 177
 178
 179 =item KOHAVERSION
 180     returns the kohaversion stored in kohaversion.pl file
 181
 182 =cut
 183
 184 sub KOHAVERSION {
 185     my $cgidir = C4::Context->intranetdir ."/cgi-bin";
 186
 187     # 2 cases here : on CVS install, $cgidir does not need a /cgi-bin
 188     # on a standard install, /cgi-bin need to be added.
 189     # test one, then the other
 190     # FIXME - is this all really necessary?
 191     unless (opendir(DIR, "$cgidir/cataloguing/value_builder")) {
 192         $cgidir = C4::Context->intranetdir;
 193         closedir(DIR);
 194     }
 195
 196     do $cgidir."/kohaversion.pl" || die "NO $cgidir/kohaversion.pl";
 197     return kohaversion();
 198 }
 199 =item read_config_file
 200
 201 =over 4
 202
 203 Reads the specified Koha config file.
 204
 205 Returns an object containing the configuration variables. The object's
 206 structure is a bit complex to the uninitiated ... take a look at the
 207 koha-conf.xml file as well as the XML::Simple documentation for details. Or,
 208 here are a few examples that may give you what you need:
 209
 210 The simple elements nested within the <config> element:
 211
 212     my $pass = $koha->{'config'}->{'pass'};
 213
 214 The <listen> elements:
 215
 216     my $listen = $koha->{'listen'}->{'biblioserver'}->{'content'};
 217
 218 The elements nested within the <server> element:
 219
 220     my $ccl2rpn = $koha->{'server'}->{'biblioserver'}->{'cql2rpn'};
 221
 222 Returns undef in case of error.
 223
 224 =back
 225
 226 =cut
 227
 228 sub read_config_file {          # Pass argument naming config file to read
 229     my $koha = XMLin(shift, keyattr => ['id'], forcearray => ['listen', 'server', 'serverinfo']);
 230     return $koha;                       # Return value: ref-to-hash holding the configuration
 231 }
 232
 233 # db_scheme2dbi
 234 # Translates the full text name of a database into de appropiate dbi name
 235 #
 236 sub db_scheme2dbi {
 237     my $name = shift;
 238
 239     for ($name) {
 240 # FIXME - Should have other databases.
 241         if (/mysql/i) { return("mysql"); }
 242         if (/Postgres|Pg|PostgresSQL/) { return("Pg"); }
 243         if (/oracle/i) { return("Oracle"); }
 244     }
 245     return undef;         # Just in case
 246 }
 247
 248 sub import {
 249     my $package = shift;
 250     my $conf_fname = shift;        # Config file name
 251     my $context;
 252
 253     # Create a new context from the given config file name, if
 254     # any, then set it as the current context.
 255     $context = new C4::Context($conf_fname);
 256     return undef if !defined($context);
 257     $context->set_context;
 258 }
 259
 260 =item new
 261
 262   $context = new C4::Context;
 263   $context = new C4::Context("/path/to/koha-conf.xml");
 264
 265 Allocates a new context. Initializes the context from the specified
 266 file, which defaults to either the file given by the C<$KOHA_CONF>
 267 environment variable, or F</etc/koha/koha-conf.xml>.
 268
 269 C<&new> does not set this context as the new default context; for
 270 that, use C<&set_context>.
 271
 272 =cut
 273
 274 #'
 275 # Revision History:
 276 # 2004-08-10 A. Tarallo: Added check if the conf file is not empty
 277 sub new {
 278     my $class = shift;
 279     my $conf_fname = shift;        # Config file to load
 280     my $self = {};
 281
 282     # check that the specified config file exists and is not empty
 283     undef $conf_fname unless
 284         (defined $conf_fname && -s $conf_fname);
 285     # Figure out a good config file to load if none was specified.
 286     if (!defined($conf_fname))
 287     {
 288         # If the $KOHA_CONF environment variable is set, use
 289         # that. Otherwise, use the built-in default.
 290         if (exists $ENV{"KOHA_CONF"} and $ENV{'KOHA_CONF'} and -s  $ENV{"KOHA_CONF"}) {
 291             $conf_fname = $ENV{"KOHA_CONF"};
 292         } elsif ($INSTALLED_CONFIG_FNAME !~ /__KOHA_CONF_DIR/ and -s $INSTALLED_CONFIG_FNAME) {
 293             # NOTE: be careful -- don't change __KOHA_CONF_DIR in the above
 294             # regex to anything else -- don't want installer to rewrite it
 295             $conf_fname = $INSTALLED_CONFIG_FNAME;
 296         } elsif (-s CONFIG_FNAME) {
 297             $conf_fname = CONFIG_FNAME;
 298         } else {
 299             warn "unable to locate Koha configuration file koha-conf.xml";
 300             return undef;
 301         }
 302     }
 303         # Load the desired config file.
 304     $self = read_config_file($conf_fname);
 305     $self->{"config_file"} = $conf_fname;
 306
 307     warn "read_config_file($conf_fname) returned undef" if !defined($self->{"config"});
 308     return undef if !defined($self->{"config"});
 309
 310     $self->{"dbh"} = undef;        # Database handle
 311     $self->{"Zconn"} = undef;    # Zebra Connections
 312     $self->{"stopwords"} = undef; # stopwords list
 313     $self->{"marcfromkohafield"} = undef; # the hash with relations between koha table fields and MARC field/subfield
 314     $self->{"userenv"} = undef;        # User env
 315     $self->{"activeuser"} = undef;        # current active user
 316     $self->{"shelves"} = undef;
 317
 318     bless $self, $class;
 319     return $self;
 320 }
 321
 322 =item set_context
 323
 324   $context = new C4::Context;
 325   $context->set_context();
 326 or
 327   set_context C4::Context $context;
 328
 329   ...
 330   restore_context C4::Context;
 331
 332 In some cases, it might be necessary for a script to use multiple
 333 contexts. C<&set_context> saves the current context on a stack, then
 334 sets the context to C<$context>, which will be used in future
 335 operations. To restore the previous context, use C<&restore_context>.
 336
 337 =cut
 338
 339 #'
 340 sub set_context
 341 {
 342     my $self = shift;
 343     my $new_context;    # The context to set
 344
 345     # Figure out whether this is a class or instance method call.
 346     #
 347     # We're going to make the assumption that control got here
 348     # through valid means, i.e., that the caller used an instance
 349     # or class method call, and that control got here through the
 350     # usual inheritance mechanisms. The caller can, of course,
 351     # break this assumption by playing silly buggers, but that's
 352     # harder to do than doing it properly, and harder to check
 353     # for.
 354     if (ref($self) eq "")
 355     {
 356         # Class method. The new context is the next argument.
 357         $new_context = shift;
 358     } else {
 359         # Instance method. The new context is $self.
 360         $new_context = $self;
 361     }
 362
 363     # Save the old context, if any, on the stack
 364     push @context_stack, $context if defined($context);
 365
 366     # Set the new context
 367     $context = $new_context;
 368 }
 369
 370 =item restore_context
 371
 372   &restore_context;
 373
 374 Restores the context set by C<&set_context>.
 375
 376 =cut
 377
 378 #'
 379 sub restore_context
 380 {
 381     my $self = shift;
 382
 383     if ($#context_stack < 0)
 384     {
 385         # Stack underflow.
 386         die "Context stack underflow";
 387     }
 388
 389     # Pop the old context and set it.
 390     $context = pop @context_stack;
 391
 392     # FIXME - Should this return something, like maybe the context
 393     # that was current when this was called?
 394 }
 395
 396 =item config
 397
 398   $value = C4::Context->config("config_variable");
 399
 400   $value = C4::Context->config_variable;
 401
 402 Returns the value of a variable specified in the configuration file
 403 from which the current context was created.
 404
 405 The second form is more compact, but of course may conflict with
 406 method names. If there is a configuration variable called "new", then
 407 C<C4::Config-E<gt>new> will not return it.
 408
 409 =cut
 410
 411 sub _common_config ($$) {
 412         my $var = shift;
 413         my $term = shift;
 414     return undef if !defined($context->{$term});
 415        # Presumably $self->{$term} might be
 416        # undefined if the config file given to &new
 417        # didn't exist, and the caller didn't bother
 418        # to check the return value.
 419
 420     # Return the value of the requested config variable
 421     return $context->{$term}->{$var};
 422 }
 423
 424 sub config {
 425         return _common_config($_[1],'config');
 426 }
 427 sub zebraconfig {
 428         return _common_config($_[1],'server');
 429 }
 430 sub ModZebrations {
 431         return _common_config($_[1],'serverinfo');
 432 }
 433
 434 =item preference
 435
 436   $sys_preference = C4::Context->preference("some_variable");
 437
 438 Looks up the value of the given system preference in the
 439 systempreferences table of the Koha database, and returns it. If the
 440 variable is not set, or in case of error, returns the undefined value.
 441
 442 =cut
 443
 444 #'
 445 # FIXME - The preferences aren't likely to change over the lifetime of
 446 # the script (and things might break if they did change), so perhaps
 447 # this function should cache the results it finds.
 448 sub preference
 449 {
 450     my $self = shift;
 451     my $var = shift;        # The system preference to return
 452     my $retval;            # Return value
 453     my $dbh = C4::Context->dbh or return 0;
 454     # Look up systempreferences.variable==$var
 455     $retval = $dbh->selectrow_array(<<EOT);
 456         SELECT    value
 457         FROM    systempreferences
 458         WHERE    variable='$var'
 459         LIMIT    1
 460 EOT
 461     return $retval;
 462 }
 463
 464 sub boolean_preference ($) {
 465     my $self = shift;
 466     my $var = shift;        # The system preference to return
 467     my $it = preference($self, $var);
 468     return defined($it)? C4::Boolean::true_p($it): undef;
 469 }
 470
 471 # AUTOLOAD
 472 # This implements C4::Config->foo, and simply returns
 473 # C4::Context->config("foo"), as described in the documentation for
 474 # &config, above.
 475
 476 # FIXME - Perhaps this should be extended to check &config first, and
 477 # then &preference if that fails. OTOH, AUTOLOAD could lead to crappy
 478 # code, so it'd probably be best to delete it altogether so as not to
 479 # encourage people to use it.
 480 sub AUTOLOAD
 481 {
 482     my $self = shift;
 483
 484     $AUTOLOAD =~ s/.*:://;        # Chop off the package name,
 485                     # leaving only the function name.
 486     return $self->config($AUTOLOAD);
 487 }
 488
 489 =item Zconn
 490
 491 $Zconn = C4::Context->Zconn
 492
 493 Returns a connection to the Zebra database for the current
 494 context. If no connection has yet been made, this method
 495 creates one and connects.
 496
 497 C<$self>
 498
 499 C<$server> one of the servers defined in the koha-conf.xml file
 500
 501 C<$async> whether this is a asynchronous connection
 502
 503 C<$auth> whether this connection has rw access (1) or just r access (0 or NULL)
 504
 505
 506 =cut
 507
 508 sub Zconn {
 509     my $self=shift;
 510     my $server=shift;
 511     my $async=shift;
 512     my $auth=shift;
 513     my $piggyback=shift;
 514     my $syntax=shift;
 515     if ( defined($context->{"Zconn"}->{$server}) && (0 == $context->{"Zconn"}->{$server}->errcode()) ) {
 516         return $context->{"Zconn"}->{$server};
 517     # No connection object or it died. Create one.
 518     }else {
 519         # release resources if we're closing a connection and making a new one
 520         # FIXME: this needs to be smarter -- an error due to a malformed query or
 521         # a missing index does not necessarily require us to close the connection
 522         # and make a new one, particularly for a batch job.  However, at
 523         # first glance it does not look like there's a way to easily check
 524         # the basic health of a ZOOM::Connection
 525         $context->{"Zconn"}->{$server}->destroy() if defined($context->{"Zconn"}->{$server});
 526
 527         $context->{"Zconn"}->{$server} = &_new_Zconn($server,$async,$auth,$piggyback,$syntax);
 528         return $context->{"Zconn"}->{$server};
 529     }
 530 }
 531
 532 =item _new_Zconn
 533
 534 $context->{"Zconn"} = &_new_Zconn($server,$async);
 535
 536 Internal function. Creates a new database connection from the data given in the current context and returns it.
 537
 538 C<$server> one of the servers defined in the koha-conf.xml file
 539
 540 C<$async> whether this is a asynchronous connection
 541
 542 C<$auth> whether this connection has rw access (1) or just r access (0 or NULL)
 543
 544 =cut
 545
 546 sub _new_Zconn {
 547     my ($server,$async,$auth,$piggyback,$syntax) = @_;
 548
 549     my $tried=0; # first attempt
 550     my $Zconn; # connection object
 551     $server = "biblioserver" unless $server;
 552     $syntax = "usmarc" unless $syntax;
 553
 554     my $host = $context->{'listen'}->{$server}->{'content'};
 555     my $servername = $context->{"config"}->{$server};
 556     my $user = $context->{"serverinfo"}->{$server}->{"user"};
 557     my $password = $context->{"serverinfo"}->{$server}->{"password"};
 558  $auth = 1 if($user && $password);
 559     retry:
 560     eval {
 561         # set options
 562         my $o = new ZOOM::Options();
 563         $o->option(user=>$user) if $auth;
 564         $o->option(password=>$password) if $auth;
 565         $o->option(async => 1) if $async;
 566         $o->option(count => $piggyback) if $piggyback;
 567         $o->option(cqlfile=> $context->{"server"}->{$server}->{"cql2rpn"});
 568         $o->option(cclfile=> $context->{"serverinfo"}->{$server}->{"ccl2rpn"});
 569         $o->option(preferredRecordSyntax => $syntax);
 570         $o->option(elementSetName => "F"); # F for 'full' as opposed to B for 'brief'
 571         $o->option(databaseName => ($servername?$servername:"biblios"));
 572
 573         # create a new connection object
 574         $Zconn= create ZOOM::Connection($o);
 575
 576         # forge to server
 577         $Zconn->connect($host, 0);
 578
 579         # check for errors and warn
 580         if ($Zconn->errcode() !=0) {
 581             warn "something wrong with the connection: ". $Zconn->errmsg();
 582         }
 583
 584     };
 585 #     if ($@) {
 586 #         # Koha manages the Zebra server -- this doesn't work currently for me because of permissions issues
 587 #         # Also, I'm skeptical about whether it's the best approach
 588 #         warn "problem with Zebra";
 589 #         if ( C4::Context->preference("ManageZebra") ) {
 590 #             if ($@->code==10000 && $tried==0) { ##No connection try restarting Zebra
 591 #                 $tried=1;
 592 #                 warn "trying to restart Zebra";
 593 #                 my $res=system("zebrasrv -f $ENV{'KOHA_CONF'} >/koha/log/zebra-error.log");
 594 #                 goto "retry";
 595 #             } else {
 596 #                 warn "Error ", $@->code(), ": ", $@->message(), "\n";
 597 #                 $Zconn="error";
 598 #                 return $Zconn;
 599 #             }
 600 #         }
 601 #     }
 602     return $Zconn;
 603 }
 604
 605 # _new_dbh
 606 # Internal helper function (not a method!). This creates a new
 607 # database connection from the data given in the current context, and
 608 # returns it.
 609 sub _new_dbh
 610 {
 611
 612 ### $context
 613     ##correct name for db_schme
 614     my $db_driver;
 615     if ($context->config("db_scheme")){
 616     $db_driver=db_scheme2dbi($context->config("db_scheme"));
 617     }else{
 618     $db_driver="mysql";
 619     }
 620
 621     my $db_name   = $context->config("database");
 622     my $db_host   = $context->config("hostname");
 623     my $db_port   = $context->config("port");
 624     $db_port = "" unless defined $db_port;
 625     my $db_user   = $context->config("user");
 626     my $db_passwd = $context->config("pass");
 627     # MJR added or die here, as we can't work without dbh
 628     my $dbh= DBI->connect("DBI:$db_driver:dbname=$db_name;host=$db_host;port=$db_port",
 629          $db_user, $db_passwd) or die $DBI::errstr;
 630     if ( $db_driver eq 'mysql' ) {
 631         # Koha 3.0 is utf-8, so force utf8 communication between mySQL and koha, whatever the mysql default config.
 632         # this is better than modifying my.cnf (and forcing all communications to be in utf8)
 633         $dbh->{'mysql_enable_utf8'}=1; #enable
 634         $dbh->do("set NAMES 'utf8'");
 635     }
 636     elsif ( $db_driver eq 'Pg' ) {
 637             $dbh->do( "set client_encoding = 'UTF8';" );
 638     }
 639     return $dbh;
 640 }
 641
 642 =item dbh
 643
 644   $dbh = C4::Context->dbh;
 645
 646 Returns a database handle connected to the Koha database for the
 647 current context. If no connection has yet been made, this method
 648 creates one, and connects to the database.
 649
 650 This database handle is cached for future use: if you call
 651 C<C4::Context-E<gt>dbh> twice, you will get the same handle both
 652 times. If you need a second database handle, use C<&new_dbh> and
 653 possibly C<&set_dbh>.
 654
 655 =cut
 656
 657 #'
 658 sub dbh
 659 {
 660     my $self = shift;
 661     my $sth;
 662
 663     if (defined($context->{"dbh"})) {
 664         $sth=$context->{"dbh"}->prepare("select 1");
 665         return $context->{"dbh"} if (defined($sth->execute));
 666     }
 667
 668     # No database handle or it died . Create one.
 669     $context->{"dbh"} = &_new_dbh();
 670
 671     return $context->{"dbh"};
 672 }
 673
 674 =item new_dbh
 675
 676   $dbh = C4::Context->new_dbh;
 677
 678 Creates a new connection to the Koha database for the current context,
 679 and returns the database handle (a C<DBI::db> object).
 680
 681 The handle is not saved anywhere: this method is strictly a
 682 convenience function; the point is that it knows which database to
 683 connect to so that the caller doesn't have to know.
 684
 685 =cut
 686
 687 #'
 688 sub new_dbh
 689 {
 690     my $self = shift;
 691
 692     return &_new_dbh();
 693 }
 694
 695 =item set_dbh
 696
 697   $my_dbh = C4::Connect->new_dbh;
 698   C4::Connect->set_dbh($my_dbh);
 699   ...
 700   C4::Connect->restore_dbh;
 701
 702 C<&set_dbh> and C<&restore_dbh> work in a manner analogous to
 703 C<&set_context> and C<&restore_context>.
 704
 705 C<&set_dbh> saves the current database handle on a stack, then sets
 706 the current database handle to C<$my_dbh>.
 707
 708 C<$my_dbh> is assumed to be a good database handle.
 709
 710 =cut
 711
 712 #'
 713 sub set_dbh
 714 {
 715     my $self = shift;
 716     my $new_dbh = shift;
 717
 718     # Save the current database handle on the handle stack.
 719     # We assume that $new_dbh is all good: if the caller wants to
 720     # screw himself by passing an invalid handle, that's fine by
 721     # us.
 722     push @{$context->{"dbh_stack"}}, $context->{"dbh"};
 723     $context->{"dbh"} = $new_dbh;
 724 }
 725
 726 =item restore_dbh
 727
 728   C4::Context->restore_dbh;
 729
 730 Restores the database handle saved by an earlier call to
 731 C<C4::Context-E<gt>set_dbh>.
 732
 733 =cut
 734
 735 #'
 736 sub restore_dbh
 737 {
 738     my $self = shift;
 739
 740     if ($#{$context->{"dbh_stack"}} < 0)
 741     {
 742         # Stack underflow
 743         die "DBH stack underflow";
 744     }
 745
 746     # Pop the old database handle and set it.
 747     $context->{"dbh"} = pop @{$context->{"dbh_stack"}};
 748
 749     # FIXME - If it is determined that restore_context should
 750     # return something, then this function should, too.
 751 }
 752
 753 =item marcfromkohafield
 754
 755   $dbh = C4::Context->marcfromkohafield;
 756
 757 Returns a hash with marcfromkohafield.
 758
 759 This hash is cached for future use: if you call
 760 C<C4::Context-E<gt>marcfromkohafield> twice, you will get the same hash without real DB access
 761
 762 =cut
 763
 764 #'
 765 sub marcfromkohafield
 766 {
 767     my $retval = {};
 768
 769     # If the hash already exists, return it.
 770     return $context->{"marcfromkohafield"} if defined($context->{"marcfromkohafield"});
 771
 772     # No hash. Create one.
 773     $context->{"marcfromkohafield"} = &_new_marcfromkohafield();
 774
 775     return $context->{"marcfromkohafield"};
 776 }
 777
 778 # _new_marcfromkohafield
 779 # Internal helper function (not a method!). This creates a new
 780 # hash with stopwords
 781 sub _new_marcfromkohafield
 782 {
 783     my $dbh = C4::Context->dbh;
 784     my $marcfromkohafield;
 785     my $sth = $dbh->prepare("select frameworkcode,kohafield,tagfield,tagsubfield from marc_subfield_structure where kohafield > ''");
 786     $sth->execute;
 787     while (my ($frameworkcode,$kohafield,$tagfield,$tagsubfield) = $sth->fetchrow) {
 788         my $retval = {};
 789         $marcfromkohafield->{$frameworkcode}->{$kohafield} = [$tagfield,$tagsubfield];
 790     }
 791     return $marcfromkohafield;
 792 }
 793
 794 =item stopwords
 795
 796   $dbh = C4::Context->stopwords;
 797
 798 Returns a hash with stopwords.
 799
 800 This hash is cached for future use: if you call
 801 C<C4::Context-E<gt>stopwords> twice, you will get the same hash without real DB access
 802
 803 =cut
 804
 805 #'
 806 sub stopwords
 807 {
 808     my $retval = {};
 809
 810     # If the hash already exists, return it.
 811     return $context->{"stopwords"} if defined($context->{"stopwords"});
 812
 813     # No hash. Create one.
 814     $context->{"stopwords"} = &_new_stopwords();
 815
 816     return $context->{"stopwords"};
 817 }
 818
 819 # _new_stopwords
 820 # Internal helper function (not a method!). This creates a new
 821 # hash with stopwords
 822 sub _new_stopwords
 823 {
 824     my $dbh = C4::Context->dbh;
 825     my $stopwordlist;
 826     my $sth = $dbh->prepare("select word from stopwords");
 827     $sth->execute;
 828     while (my $stopword = $sth->fetchrow_array) {
 829         my $retval = {};
 830         $stopwordlist->{$stopword} = uc($stopword);
 831     }
 832     $stopwordlist->{A} = "A" unless $stopwordlist;
 833     return $stopwordlist;
 834 }
 835
 836 =item userenv
 837
 838   C4::Context->userenv;
 839
 840 Builds a hash for user environment variables.
 841
 842 This hash shall be cached for future use: if you call
 843 C<C4::Context-E<gt>userenv> twice, you will get the same hash without real DB access
 844
 845 set_userenv is called in Auth.pm
 846
 847 =cut
 848
 849 #'
 850 sub userenv
 851 {
 852     my $var = $context->{"activeuser"};
 853     return $context->{"userenv"}->{$var} if (defined $context->{"userenv"}->{$var});
 854     # insecure=1 management
 855     if ($context->{"dbh"} && $context->preference('insecure')) {
 856         my %insecure;
 857         $insecure{flags} = '16382';
 858         $insecure{branchname} ='Insecure';
 859         $insecure{number} ='0';
 860         $insecure{cardnumber} ='0';
 861         $insecure{id} = 'insecure';
 862         $insecure{branch} = 'INS';
 863         $insecure{emailaddress} = 'test@mode.insecure.com';
 864         return \%insecure;
 865     } else {
 866         return 0;
 867     }
 868 }
 869
 870 =item set_userenv
 871
 872   C4::Context->set_userenv($usernum, $userid, $usercnum, $userfirstname, $usersurname, $userbranch, $userflags, $emailaddress);
 873
 874 Informs a hash for user environment variables.
 875
 876 This hash shall be cached for future use: if you call
 877 C<C4::Context-E<gt>userenv> twice, you will get the same hash without real DB access
 878
 879 set_userenv is called in Auth.pm
 880
 881 =cut
 882
 883 #'
 884 sub set_userenv{
 885     my ($usernum, $userid, $usercnum, $userfirstname, $usersurname, $userbranch, $branchname, $userflags, $emailaddress, $branchprinter)= @_;
 886     my $var=$context->{"activeuser"};
 887     my $cell = {
 888         "number"     => $usernum,
 889         "id"         => $userid,
 890         "cardnumber" => $usercnum,
 891         "firstname"  => $userfirstname,
 892         "surname"    => $usersurname,
 893 #possibly a law problem
 894         "branch"     => $userbranch,
 895         "branchname" => $branchname,
 896         "flags"      => $userflags,
 897         "emailaddress"    => $emailaddress,
 898                 "branchprinter"    => $branchprinter
 899     };
 900     $context->{userenv}->{$var} = $cell;
 901     return $cell;
 902 }
 903
 904 sub set_shelves_userenv ($) {
 905         my $lists = shift or return undef;
 906         my $activeuser = $context->{activeuser} or return undef;
 907         $context->{userenv}->{$activeuser}->{shelves} = $lists;
 908         # die "set_shelves_userenv: $lists";
 909 }
 910 sub get_shelves_userenv () {
 911         my $active;
 912         unless ($active = $context->{userenv}->{$context->{activeuser}}) {
 913                 warn "get_shelves_userenv cannot retrieve context->{userenv}->{context->{activeuser}}";
 914                 return undef;
 915         }
 916         my $lists = $active->{shelves} or return undef;#  die "get_shelves_userenv: activeenv has no ->{shelves}";
 917         return $lists;
 918 }
 919
 920 =item _new_userenv
 921
 922   C4::Context->_new_userenv($session);
 923
 924 Builds a hash for user environment variables.
 925
 926 This hash shall be cached for future use: if you call
 927 C<C4::Context-E<gt>userenv> twice, you will get the same hash without real DB access
 928
 929 _new_userenv is called in Auth.pm
 930
 931 =cut
 932
 933 #'
 934 sub _new_userenv
 935 {
 936     shift;
 937     my ($sessionID)= @_;
 938      $context->{"activeuser"}=$sessionID;
 939 }
 940
 941 =item _unset_userenv
 942
 943   C4::Context->_unset_userenv;
 944
 945 Destroys the hash for activeuser user environment variables.
 946
 947 =cut
 948
 949 #'
 950
 951 sub _unset_userenv
 952 {
 953     my ($sessionID)= @_;
 954     undef $context->{"activeuser"} if ($context->{"activeuser"} eq $sessionID);
 955 }
 956
 957
 958 =item get_versions
 959
 960   C4::Context->get_versions
 961
 962 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'.
 963
 964 =cut
 965
 966 #'
 967
 968 # A little example sub to show more debugging info for CGI::Carp
 969 sub get_versions {
 970     my %versions;
 971     $versions{kohaVersion}  = KOHAVERSION();
 972     $versions{kohaDbVersion} = C4::Context->preference('version');
 973     $versions{osVersion} = `uname -a`;
 974     $versions{perlVersion} = $];
 975     $versions{mysqlVersion} = `mysql -V`;
 976     $versions{apacheVersion} =  `httpd -v`;
 977     $versions{apacheVersion} =  `httpd2 -v`            unless  $versions{apacheVersion} ;
 978     $versions{apacheVersion} =  `apache2 -v`           unless  $versions{apacheVersion} ;
 979     $versions{apacheVersion} =  `/usr/sbin/apache2 -v` unless  $versions{apacheVersion} ;
 980     return %versions;
 981 }
 982
 983
 984 1;
 985 __END__
 986
 987 =back
 988
 989 =head1 ENVIRONMENT
 990
 991 =over 4
 992
 993 =item C<KOHA_CONF>
 994
 995 Specifies the configuration file to read.
 996
 997 =back
 998
 999 =head1 SEE ALSO
1000
1001 XML::Simple
1002
1003 =head1 AUTHORS
1004
1005 Andrew Arensburger <arensb at ooblick dot com>
1006
1007 Joshua Ferraro <jmf at liblime dot com>
1008
1009 =cut
1010
1011 # Revision 1.57  2007/05/22 09:13:55  tipaul
1012 # Bugfixes & improvements (various and minor) :
1013 # - updating templates to have tmpl_process3.pl running without any errors
1014 # - adding a drupal-like css for prog templates (with 3 small images)
1015 # - fixing some bugs in circulation & other scripts
1016 # - updating french translation
1017 # - fixing some typos in templates
1018 #
1019 # Revision 1.56  2007/04/23 15:21:17  tipaul
1020 # renaming currenttransfers to transferstoreceive
1021 #
1022 # Revision 1.55  2007/04/17 08:48:00  tipaul
1023 # circulation cleaning continued: bufixing
1024 #
1025 # Revision 1.54  2007/03/29 16:45:53  tipaul
1026 # Code cleaning of Biblio.pm (continued)
1027 #
1028 # All subs have be cleaned :
1029 # - removed useless
1030 # - merged some
1031 # - reordering Biblio.pm completly
1032 # - using only naming conventions
1033 #
1034 # Seems to have broken nothing, but it still has to be heavily tested.
1035 # Note that Biblio.pm is now much more efficient than previously & probably more reliable as well.
1036 #
1037 # Revision 1.53  2007/03/29 13:30:31  tipaul
1038 # Code cleaning :
1039 # == Biblio.pm cleaning (useless) ==
1040 # * some sub declaration dropped
1041 # * removed modbiblio sub
1042 # * removed moditem sub
1043 # * removed newitems. It was used only in finishrecieve. Replaced by a TransformKohaToMarc+AddItem, that is better.
1044 # * removed MARCkoha2marcItem
1045 # * removed MARCdelsubfield declaration
1046 # * removed MARCkoha2marcBiblio
1047 #
1048 # == Biblio.pm cleaning (naming conventions) ==
1049 # * MARCgettagslib renamed to GetMarcStructure
1050 # * MARCgetitems renamed to GetMarcItem
1051 # * MARCfind_frameworkcode renamed to GetFrameworkCode
1052 # * MARCmarc2koha renamed to TransformMarcToKoha
1053 # * MARChtml2marc renamed to TransformHtmlToMarc
1054 # * MARChtml2xml renamed to TranformeHtmlToXml
1055 # * zebraop renamed to ModZebra
1056 #
1057 # == MARC=OFF ==
1058 # * removing MARC=OFF related scripts (in cataloguing directory)
1059 # * removed checkitems (function related to MARC=off feature, that is completly broken in head. If someone want to reintroduce it, hard work coming...)
1060 # * removed getitemsbybiblioitem (used only by MARC=OFF scripts, that is removed as well)
1061 #
1062 # Revision 1.52  2007/03/16 01:25:08  kados
1063 # Using my precrash CVS copy I did the following:
1064 #
1065 # cvs -z3 -d:ext:kados@cvs.savannah.nongnu.org:/sources/koha co -P koha
1066 # find koha.precrash -type d -name "CVS" -exec rm -v {} \;
1067 # cp -r koha.precrash/* koha/
1068 # cd koha/
1069 # cvs commit
1070 #
1071 # This should in theory put us right back where we were before the crash
1072 #
1073 # Revision 1.52  2007/03/12 21:17:05  rych
1074 # add server, serverinfo as arrays from config
1075 #
1076 # Revision 1.51  2007/03/09 14:31:47  tipaul
1077 # rel_3_0 moved to HEAD
1078 #
1079 # Revision 1.43.2.10  2007/02/09 17:17:56  hdl
1080 # Managing a little better database absence.
1081 # (preventing from BIG 550)
1082 #
1083 # Revision 1.43.2.9  2006/12/20 16:50:48  tipaul
1084 # improving "insecure" management
1085 #
1086 # WARNING KADOS :
1087 # you told me that you had some libraries with insecure=ON (behind a firewall).
1088 # 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.
1089 #
1090 # Revision 1.43.2.8  2006/12/19 16:48:16  alaurin
1091 # reident programs, and adding branchcode value in reserves
1092 #
1093 # Revision 1.43.2.7  2006/12/06 21:55:38  hdl
1094 # Adding ModZebrations for servers to get serverinfos in Context.pm
1095 # Using this function in rebuild_zebra.pl
1096 #
1097 # Revision 1.43.2.6  2006/11/24 21:18:31  kados
1098 # very minor changes, no functional ones, just comments, etc.
1099 #
1100 # Revision 1.43.2.5  2006/10/30 13:24:16  toins
1101 # fix some minor POD error.
1102 #
1103 # Revision 1.43.2.4  2006/10/12 21:42:49  hdl
1104 # Managing multiple zebra connections
1105 #
1106 # Revision 1.43.2.3  2006/10/11 14:27:26  tipaul
1107 # removing a warning
1108 #
1109 # Revision 1.43.2.2  2006/10/10 15:28:16  hdl
1110 # BUG FIXING : using database name in Zconn if defined and not hard coded value
1111 #
1112 # Revision 1.43.2.1  2006/10/06 13:47:28  toins
1113 # Synch with dev_week.
1114 #  /!\ WARNING :: Please now use the new version of koha.xml.
1115 #
1116 # Revision 1.18.2.5.2.14  2006/09/24 15:24:06  kados
1117 # remove Zebraauth routine, fold the functionality into Zconn
1118 # Zconn can now take several arguments ... this will probably
1119 # change soon as I'm not completely happy with the readability
1120 # of the current format ... see the POD for details.
1121 #
1122 # cleaning up Biblio.pm, removing unnecessary routines.
1123 #
1124 # DeleteBiblio - used to delete a biblio from zebra and koha tables
1125 #     -- checks to make sure there are no existing issues
1126 #     -- saves backups of biblio,biblioitems,items in deleted* tables
1127 #     -- does commit operation
1128 #
1129 # getRecord - used to retrieve one record from zebra in piggyback mode using biblionumber
1130 # brought back z3950_extended_services routine
1131 #
1132 # Lots of modifications to Context.pm, you can now store user and pass info for
1133 # multiple servers (for federated searching) using the <serverinfo> element.
1134 # I'll commit my koha.xml to demonstrate this or you can refer to the POD in
1135 # Context.pm (which I also expanded on).
1136 #
1137 # Revision 1.18.2.5.2.13  2006/08/10 02:10:21  kados
1138 # Turned warnings on, and running a search turned up lots of warnings.
1139 # Cleaned up those ...
1140 #
1141 # removed getitemtypes from Koha.pm (one in Search.pm looks newer)
1142 # removed itemcount from Biblio.pm
1143 #
1144 # made some local subs local with a _ prefix (as they were redefined
1145 # elsewhere)
1146 #
1147 # Add two new search subs to Search.pm the start of a new search API
1148 # that's a bit more scalable
1149 #
1150 # Revision 1.18.2.5.2.10  2006/07/21 17:50:51  kados
1151 # moving the *.properties files to intranetdir/etc dir
1152 #
1153 # Revision 1.18.2.5.2.9  2006/07/17 08:05:20  tipaul
1154 # there was a hardcoded link to /koha/etc/ I replaced it with intranetdir config value
1155 #
1156 # Revision 1.18.2.5.2.8  2006/07/11 12:20:37  kados
1157 # adding ccl and cql files ... Tumer, if you want to fit these into the
1158 # config file by all means do.
1159 #
1160 # Revision 1.18.2.5.2.7  2006/06/04 22:50:33  tgarip1957
1161 # We do not hard code cql2rpn conversion file in context.pm our koha.xml configuration file already describes the path for this file.
1162 # At cql searching we use method CQL not CQL2RPN as the cql2rpn conversion file is defined at server level
1163 #
1164 # Revision 1.18.2.5.2.6  2006/06/02 23:11:24  kados
1165 # Committing my working dev_week. It's been tested only with
1166 # searching, and there's quite a lot of config stuff to set up
1167 # beforehand. As things get closer to a release, we'll be making
1168 # some scripts to do it for us
1169 #
1170 # Revision 1.18.2.5.2.5  2006/05/28 18:49:12  tgarip1957
1171 # This is an unusual commit. The main purpose is a working model of Zebra on a modified rel2_2.
1172 # Any questions regarding these commits should be asked to Joshua Ferraro unless you are Joshua whom I'll report to
1173 #
1174 # Revision 1.36  2006/05/09 13:28:08  tipaul
1175 # adding the branchname and the librarian name in every page :
1176 # - modified userenv to add branchname
1177 # - modifier menus.inc to have the librarian name & userenv displayed on every page. they are in a librarian_information div.
1178 #
1179 # Revision 1.35  2006/04/13 08:40:11  plg
1180 # bug fixed: typo on Zconnauth name
1181 #
1182 # Revision 1.34  2006/04/10 21:40:23  tgarip1957
1183 # 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:
1184 # zebradb=localhost
1185 # zebraport=<your port>
1186 # zebrauser=<username>
1187 # zebrapass=<password>
1188 #
1189 # The zebra.cfg file should read:
1190 # perm.anonymous:r
1191 # perm.username:rw
1192 # passw.c:<yourpasswordfile>
1193 #
1194 # Password file should be prepared with Apaches htpasswd utility in encrypted mode and should exist in a folder zebra.cfg can read
1195 #
1196 # Revision 1.33  2006/03/15 11:21:56  plg
1197 # bug fixed: utf-8 data where not displayed correctly in screens. Supposing
1198 # your data are truely utf-8 encoded in your database, they should be
1199 # correctly displayed. "set names 'UTF8'" on mysql connection (C4/Context.pm)
1200 # is mandatory and "binmode" to utf8 (C4/Interface/CGI/Output.pm) seemed to
1201 # converted data twice, so it was removed.
1202 #
1203 # Revision 1.32  2006/03/03 17:25:01  hdl
1204 # Bug fixing : a line missed a comment sign.
1205 #
1206 # Revision 1.31  2006/03/03 16:45:36  kados
1207 # Remove the search that tests the Zconn -- warning, still no fault
1208 # tollerance
1209 #
1210 # Revision 1.30  2006/02/22 00:56:59  kados
1211 # First go at a connection object for Zebra. You can now get a
1212 # connection object by doing:
1213 #
1214 # my $Zconn = C4::Context->Zconn;
1215 #
1216 # My initial tests indicate that as soon as your funcion ends
1217 # (ie, when you're done doing something) the connection will be
1218 # closed automatically. There may be some other way to make the
1219 # connection more stateful, I'm not sure...
1220 #
1221 # Local Variables:
1222 # tab-width: 4
1223 # End: