--- loncom/interface/lonsearchcat.pm 2001/03/15 18:51:09 1.20 +++ loncom/interface/lonsearchcat.pm 2004/04/14 18:29:32 1.206 @@ -1,570 +1,2832 @@ -# The LearningOnline Network +# The LearningOnline Network with CAPA # Search Catalog # -# 03/08/2001 Scott Harrison +# $Id: lonsearchcat.pm,v 1.206 2004/04/14 18:29:32 matthew Exp $ # +# Copyright Michigan State University Board of Trustees +# +# This file is part of the LearningOnline Network with CAPA (LON-CAPA). +# +# LON-CAPA 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 2 of the License, or +# (at your option) any later version. +# +# LON-CAPA is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with LON-CAPA; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +# +# /home/httpd/html/adm/gpl.txt +# +# http://www.lon-capa.org/ +# +############################################################################### +############################################################################### + +=pod + +=head1 NAME + +lonsearchcat - LONCAPA Search Interface + +=head1 SYNOPSIS + +Search interface to LON-CAPAs digital library + +=head1 DESCRIPTION + +This module enables searching for a distributed browseable catalog. + +This is part of the LearningOnline Network with CAPA project +described at http://www.lon-capa.org. + +lonsearchcat presents the user with an interface to search the LON-CAPA +digital library. lonsearchcat also initiates the execution of a search +by sending the search parameters to LON-CAPA servers. The progress of +search (on a server basis) is displayed to the user in a separate window. + +=head1 Internals + +=over 4 + +=cut + +############################################################################### +############################################################################### + package Apache::lonsearchcat; use strict; -use Apache::Constants qw(:common); +use Apache::Constants qw(:common :http); use Apache::lonnet(); use Apache::File(); use CGI qw(:standard); +use Text::Query; +use GDBM_File; +use Apache::loncommon(); +use Apache::lonmysql(); +use Apache::lonmeta; +use Apache::lonhtmlcommon; +use Apache::lonlocal; +use LONCAPA::lonmetadata(); + +###################################################################### +###################################################################### +## +## Global variables +## +###################################################################### +###################################################################### +my %groupsearch_db; # Database hash used to save values for the + # groupsearch RAT interface. +my %persistent_db; # gdbm hash which holds data which is supposed to + # persist across calls to lonsearchcat.pm + +# The different view modes and associated functions + +my %Views = ("detailed" => \&detailed_citation_view, + "summary" => \&summary_view, + "fielded" => \&fielded_format_view, + "xml" => \&xml_sgml_view, + "compact" => \&compact_view); -my %language; -my $scrout; -my %metadatafields; -my %cprtag; -my %mimetag; - +###################################################################### +###################################################################### sub handler { my $r = shift; +# &set_defaults(); + # + # set form defaults + # + my $hidden_fields;# Hold all the hidden fields used to keep track + # of the search system state + my $importbutton; # button to take the selected results and go to group + # sorting + my $diropendb; # The full path to the (temporary) search database file. + # This is set and used in &handler() and is also used in + # &output_results(). + my $bodytag; # LON-CAPA standard body tag, gotten from + # &Apache::lonnet::bodytag. + # No title, no table, just a tag. + + my $loaderror=&Apache::lonnet::overloaderror($r); + if ($loaderror) { return $loaderror; } + + my $closebutton; # button that closes the search window + # This button is different for the RAT compared to + # normal invocation. + # + &Apache::loncommon::content_type($r,'text/html'); + $r->send_http_header; + return OK if $r->header_only; + ## + ## Prevent caching of the search interface window. Hopefully this means + ## we will get the launch=1 passed in a little more. + &Apache::loncommon::no_cache($r); + ## + ## Pick up form fields passed in the links. + ## + &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'}, + ['catalogmode','launch','acts','mode','form','element','pause', + 'phase','persistent_db_id','table','start','show', + 'cleargroupsort','titleelement']); + ## + ## The following is a trick - we wait a few seconds if asked to so + ## the daemon running the search can get ahead of the daemon + ## printing the results. We only need (theoretically) to do + ## this once, so the pause indicator is deleted + ## + if (exists($ENV{'form.pause'})) { + sleep(1); + delete($ENV{'form.pause'}); + } + ## + ## Initialize global variables + ## + my $domain = $r->dir_config('lonDefDomain'); + $diropendb= "/home/httpd/perl/tmp/$ENV{'user.domain'}_$ENV{'user.name'}_searchcat.db"; + # + # set the name of the persistent database + # $ENV{'form.persistent_db_id'} can only have digits in it. + if (! exists($ENV{'form.persistent_db_id'}) || + ($ENV{'form.persistent_db_id'} =~ /\D/) || + ($ENV{'form.launch'} eq '1')) { + $ENV{'form.persistent_db_id'} = time; + } + $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1); + my $persistent_db_file = "/home/httpd/perl/tmp/". + &Apache::lonnet::escape($domain). + '_'.&Apache::lonnet::escape($ENV{'user.name'}). + '_'.$ENV{'form.persistent_db_id'}.'_persistent_search.db'; + ## + if (! &get_persistent_form_data($persistent_db_file)) { + if ($ENV{'form.phase'} =~ /(run_search|results)/) { + &Apache::lonnet::logthis("lonsearchcat:Unable to recover data ". + "from $persistent_db_file"); + $r->print(< +LON-CAPA Search Error +$bodytag +We were unable to retrieve data describing your search. This is a serious +error and has been logged. Please alert your LON-CAPA administrator. + + +END + return OK; + } + } + ## + ## Clear out old values from groupsearch database + ## + untie %groupsearch_db if (tied(%groupsearch_db)); + if (($ENV{'form.cleargroupsort'} eq '1') || + (($ENV{'form.launch'} eq '1') && + ($ENV{'form.catalogmode'} eq 'groupsearch'))) { + if (tie(%groupsearch_db,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) { + &start_fresh_session(); + untie %groupsearch_db; + delete($ENV{'form.cleargroupsort'}); + } else { + # This is a stupid error to give to the user. + # It really tells them nothing. + $r->print(''.$bodytag. + 'Unable to tie hash to db file'); + return OK; + } + } + ## + ## Configure hidden fields + ## + $hidden_fields = ''."\n"; + if (exists($ENV{'form.catalogmode'})) { + $hidden_fields .= ''."\n"; + } + if (exists($ENV{'form.form'})) { + $hidden_fields .= ''."\n"; + } + if (exists($ENV{'form.element'})) { + $hidden_fields .= ''."\n"; + } + if (exists($ENV{'form.titleelement'})) { + $hidden_fields .= ''."\n"; + } + if (exists($ENV{'form.mode'})) { + $hidden_fields .= ''."\n"; + } + ## + ## Configure dynamic components of interface + ## + if ($ENV{'form.catalogmode'} eq 'interactive') { + $closebutton=" +END + } else { + $closebutton = ''; + $importbutton = ''; + } + ## + ## Sanity checks on form elements + ## + if (!defined($ENV{'form.viewselect'})) { + if (($ENV{'form.catalogmode'} eq 'groupsearch') || + ($ENV{'form.catalogmode'} eq 'interactive')) { + $ENV{'form.viewselect'} ="Compact View"; + } else { + $ENV{'form.viewselect'} ="Detailed Citation View"; + } + } + $ENV{'form.phase'} = 'disp_basic' if (! exists($ENV{'form.phase'})); + $ENV{'form.show'} = 20 if (! exists($ENV{'form.show'})); + ## + ## Switch on the phase + ## + if ($ENV{'form.phase'} eq 'disp_basic') { + &print_basic_search_form($r,$closebutton,$hidden_fields); + } elsif ($ENV{'form.phase'} eq 'disp_adv') { + &print_advanced_search_form($r,$closebutton,$hidden_fields); + } elsif ($ENV{'form.phase'} eq 'results') { + &display_results($r,$importbutton,$closebutton,$diropendb); + } elsif ($ENV{'form.phase'} =~ /^(sort|run_search)$/) { + my ($query,$customquery,$customshow,$libraries,$pretty_string) = + &get_persistent_data($persistent_db_file, + ['query','customquery','customshow', + 'libraries','pretty_string']); + if ($ENV{'form.phase'} eq 'sort') { + &print_sort_form($r,$pretty_string); + } elsif ($ENV{'form.phase'} eq 'run_search') { + &run_search($r,$query,$customquery,$customshow, + $libraries,$pretty_string); + } + } elsif ($ENV{'form.phase'} eq 'course_search') { + &course_search($r); + } elsif(($ENV{'form.phase'} eq 'basic_search') || + ($ENV{'form.phase'} eq 'adv_search')) { + $ENV{'form.searchmode'} = 'basic'; + if ($ENV{'form.phase'} eq 'adv_search') { + $ENV{'form.searchmode'} = 'advanced'; + } + # Set up table + if (! defined(&create_results_table())) { + my $errorstring=&Apache::lonmysql::get_error(); + $r->print(<Search Error +$bodytag +Unable to create table in which to store search results. +The search has been aborted. +
$errorstring + + +END + return OK; + } + delete($ENV{'form.launch'}); + if (! &make_form_data_persistent($r,$persistent_db_file)) { + $r->print(<Search Error +$bodytag +Unable to properly store search information. The search has been aborted. + + +END + return OK; + } + # + # We are running a search + my ($query,$customquery,$customshow,$libraries) = + (undef,undef,undef,undef); + my $pretty_string; + if ($ENV{'form.phase'} eq 'basic_search') { + ($query,$pretty_string,$libraries) = + &parse_basic_search($r,$closebutton,$hidden_fields); + } else { # Advanced search + ($query,$customquery,$customshow,$libraries,$pretty_string) + = &parse_advanced_search($r,$closebutton,$hidden_fields); + return OK if (! defined($query)); + } + &make_persistent({ query => $query, + customquery => $customquery, + customshow => $customshow, + libraries => $libraries, + pretty_string => $pretty_string }, + $persistent_db_file); + ## + ## Print out the frames interface + ## + &print_frames_interface($r); + } + return OK; +} + +###################################################################### +###################################################################### +## +## Course Search +## +###################################################################### +###################################################################### +{ # Scope the course search to avoid global variables +# +# Variables For course search +my %alreadyseen; +my %hash; +my $totalfound; + +sub course_search { + my $r=shift; + my $bodytag=&Apache::loncommon::bodytag('Course Search'). + &Apache::loncommon::help_open_bug('Searching'); + my $pretty_search_string = ''.$ENV{'form.courseexp'}.''; + my $search_string = $ENV{'form.courseexp'}; + my @New_Words; + if ($ENV{'form.crsrelated'}) { + ($search_string,@New_Words) = &related_version($ENV{'form.courseexp'}); + if (@New_Words) { + $pretty_search_string .= ' '.&mt("with related words").": @New_Words."; + } else { + $pretty_search_string .= ' '.&mt('with no related words')."."; + } + } + my $fulltext=$ENV{'form.crsfulltext'}; + my @allwords=($search_string,@New_Words); + $totalfound=0; + $r->print('LON-CAPA Course Search'. + $bodytag.'
'.$pretty_search_string.'
'); + $r->rflush(); +# ======================================================= Go through the course + undef %alreadyseen; + %alreadyseen=(); + my $c=$r->connection; + if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.".db", + &GDBM_READER(),0640)) { + foreach (keys %hash) { + if ($c->aborted()) { last; } + if (($_=~/^src\_(.+)$/) && (!$alreadyseen{$hash{$_}})) { + &checkonthis($r,$hash{$_},0,$hash{'title_'.$1},$fulltext, + @allwords); + } + } + untie(%hash); + } + unless ($totalfound) { + $r->print('

'.&mt('No resources found').'.

'); + } +# =================================================== Done going through course + $r->print(''); +} -# -------------------------------------- see if called from an interactive mode - map { - my ($name, $value) = split(/=/,$_); - $value =~ tr/+/ /; - $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; - if ($name eq 'catalogmode') { - $ENV{'form.'.$name}=$value; +# =============================== This pulls up a resource and its dependencies + +sub checkonthis { + my ($r,$url,$level,$title,$fulltext,@allwords)=@_; + $alreadyseen{$url}=1; + $r->rflush(); + my $result=&Apache::lonnet::metadata($url,'title').' '. + &Apache::lonnet::metadata($url,'subject').' '. + &Apache::lonnet::metadata($url,'abstract').' '. + &Apache::lonnet::metadata($url,'keywords'); + if (($url) && ($fulltext)) { + $result.=&Apache::lonnet::ssi_body($url); + } + $result=~s/\s+/ /gs; + my $applies=0; + foreach (@allwords) { + if ($_=~/\w/) { + if ($result=~/$_/si) { + $applies++; + } + } + } +# Does this resource apply? + if ($applies) { + $r->print('
'); + for (my $i=0;$i<=$level*5;$i++) { + $r->print(' '); + } + $r->print(''. + ($title?$title:$url).'
'); + $totalfound++; + } elsif ($fulltext) { + $r->print(' .'); + } + $r->rflush(); +# Check also the dependencies of this one + my $dependencies= + &Apache::lonnet::metadata($url,'dependencies'); + foreach (split(/\,/,$dependencies)) { + if (($_=~/^\/res\//) && (!$alreadyseen{$_})) { + &checkonthis($r,$_,$level+1,'',$fulltext,@allwords); } - } (split(/&/,$ENV{'QUERY_STRING'})); + } +} - $r->content_type('text/html'); - $r->send_http_header; - return OK if $r->header_only; +sub untiehash { + if (tied(%hash)) { + untie(%hash); + } +} + +} # End of course search scoping + +###################################################################### +###################################################################### + +=pod + +=item &print_basic_search_form() - %metadatafields=(); +Prints the form for the basic search. Sorry the name is so cryptic. - my $hidden=''; - $hidden=< +=cut + +###################################################################### +###################################################################### +sub print_basic_search_form { + my ($r,$closebutton,$hidden_fields) = @_; + my $bodytag=&Apache::loncommon::bodytag('Search'). + &Apache::loncommon::help_open_topic('Finding_Resources'). + &Apache::loncommon::help_open_bug('Searching'); + my $scrout=<<"ENDDOCUMENT"; + + +The LearningOnline Network with CAPA + + +$bodytag +ENDDOCUMENT +if (&Apache::lonnet::allowed('bre',$ENV{'request.role.domain'})) { + my $CatalogSearch=&mt('Catalog Search'); + my $Statement=&searchhelp(); + $scrout.=(<$CatalogSearch +
+ +$hidden_fields +

+$Statement. +

+

+ + + + +
+ENDDOCUMENT + $scrout.=' '.&Apache::lonhtmlcommon::textbox('basicexp', + $ENV{'form.basicexp'},40). + ' '; + my $relatedcheckbox = &Apache::lonhtmlcommon::checkbox('related', + $ENV{'form.related'}); + my $domain = $r->dir_config('lonDefDomain'); + my $domaincheckbox = &Apache::lonhtmlcommon::checkbox('domains', + $ENV{'form.domains'}); + my $srch=&mt('Search'); + my $header=&mt('Advanced Search'); + my $userelatedwords=&mt('use related words'); + my $onlysearchdomain=&mt('only search domain'); + my $view=&viewoptions(); + $scrout.=<$header
$relatedcheckbox $userelatedwords$domaincheckbox $onlysearchdomain $domain
+

+$view +

+   +$closebutton END + $scrout.=< + +ENDDOCUMENT + } + if ($ENV{'request.course.id'}) { + my %lt=&Apache::lonlocal::texthash( + 'srch' => 'Search', + 'header' => 'Course Search', + 'note' => 'Enter terms or phrases, then press "Search" below', + 'use' => 'use related words', + 'full' =>'fulltext search (time consuming)' + ); + $scrout.=(< +

$lt{'header'}

+
+ +$hidden_fields +

+$lt{'note'}. +

+

+ + + + +
+ENDCOURSESEARCH + $scrout.=' '. + &Apache::lonhtmlcommon::textbox('courseexp', + $ENV{'form.courseexp'},40); + my $crscheckbox = + &Apache::lonhtmlcommon::checkbox('crsfulltext', + $ENV{'form.crsfulltext'}); + my $relcheckbox = + &Apache::lonhtmlcommon::checkbox('crsrelated', + $ENV{'form.crsrelated'}); + $scrout.=(<
$relcheckbox $lt{'use'}
$crscheckbox $lt{'full'}

+  +

+ENDENDCOURSE + } + $scrout.=(< + +ENDDOCUMENT + $r->print($scrout); + return; +} +###################################################################### +###################################################################### -# ------------------------------------------------ First, check out environment - $metadatafields{'owner'}=$ENV{'user.name'}.'@'.$ENV{'user.domain'}; +=pod -# --------------------------------- Compute various listings of metadata values - - %language=(); - $language{'any'}='Any language'; - { - my $fh=Apache::File->new($r->dir_config('lonTabDir').'/language.tab'); - map { - $_=~/(\w+)\s+([\w\s\-]+)/; - $language{$1}=$2; - } <$fh>; +=item &advanced_search_form() + +Prints the advanced search form. + +=cut + +###################################################################### +###################################################################### +sub print_advanced_search_form{ + my ($r,$closebutton,$hidden_fields) = @_; + my %lt=&Apache::lonlocal::texthash('srch' => 'Search', + 'reset' => 'Reset', + 'help' => 'Help'); + my $advanced_buttons = <<"END"; +

+ + +$closebutton + +

+END + my $bodytag=&Apache::loncommon::bodytag('Advanced Catalog Search'); + my $searchhelp=&searchhelp(); + my $scrout=<<"ENDHEADER"; + + +The LearningOnline Network with CAPA + + +$bodytag +$searchhelp + +$advanced_buttons +$hidden_fields + +ENDHEADER + $scrout.=&viewoptions(); + my %fields=&Apache::lonmeta::fieldnames(); + + $scrout.=''; + $scrout.="\n"; + foreach ('title','author','owner','authorspace','modifyinguser', + 'keywords','notes','abstract','standards', + 'lowestgradelevel','highestgradelevel','mime') { + $scrout.=''; + } + $scrout.=''; + $scrout.=''; + my %dates=&Apache::lonlocal::texthash + ('creationdatestart' => 'Creation Date After', + 'creationdateend' => 'Creation Date Before', + 'lastrevisiondatestart' => 'Last Revision Date After', + 'lastrevisiondateend' => 'Last Revision Date Before'); + foreach (sort keys %dates) { + $scrout.=''. + ''. + ''; + } + + $scrout.="
".&mt('Field').''.&mt('Value').'' + .&mt('Related').'
'.&mt('Words')."
'.&titlefield($fields{$_}).''. + &Apache::lonmeta::prettyinput($_,$ENV{'form.'.$_},$_,'advsearch', + 1,'',$ENV{'form.'.$_.'_related'}). + '
'. + &titlefield(&mt('MIME Type Category')).''. + &Apache::loncommon::filecategoryselect('category', + $ENV{'form.category'}). + ' 
'. + &titlefield(&mt('Limit Search to Domains')).''. + &Apache::loncommon::domain_select('domains', + $ENV{'form.domains'},1). + ' 
'.&titlefield($dates{$_}).''. + &Apache::lonhtmlcommon::date_setter('advsearch',$_,0,'',1). + ' 
\n"; + $scrout.=< + + +ENDDOCUMENT + $r->print($scrout); + return; +} + +###################################################################### +###################################################################### + +=pod + +=item &titlefield() + +Inputs: title text + +Outputs: titletext with font wrapper + +=cut + +###################################################################### +###################################################################### +sub titlefield { + my $title=shift; + return ''.$title.''; +} + +###################################################################### +###################################################################### + +=pod + +=item viewoptiontext() + +Inputs: codename for view option + +Outputs: displayed text + +=cut + +###################################################################### +###################################################################### +sub viewoptiontext { + my $code=shift; + my %desc=&Apache::lonlocal::texthash + ('detailed' => "Detailed Citation View", + 'xml' => 'XML/SGML', + 'compact' => 'Compact View', + 'fielded' => 'Fielded Format', + 'summary' => 'Summary View'); + return $desc{$code}; +} + +###################################################################### +###################################################################### + +=pod + +=item viewoptions() - %cprtag=(); - $cprtag{'any'}='Any copyright/distribution'; - { - my $fh=Apache::File->new($r->dir_config('lonIncludes').'/copyright.tab'); - map { - $_=~/(\w+)\s+([\w\s\-]+)/; - $cprtag{$1}=$2; - } <$fh>; +Inputs: none + +Outputs: text for box with view options + +=cut + +###################################################################### +###################################################################### +sub viewoptions { + my $scrout="\n\n".''. + '
'.&mt('View Options').''. + &mt('Records per Page').'
'; + unless ($ENV{'form.viewselect'}) { $ENV{'form.viewselect'}='detailed'; } + $scrout.=&Apache::lonmeta::selectbox('viewselect', + $ENV{'form.viewselect'}, + \&viewoptiontext, + sort(keys(%Views))); + $scrout.=''; + $scrout.=&Apache::lonmeta::selectbox('show', + $ENV{'form.show'}, + undef, + (10,20,50,100,1000,10000)); + $scrout.="
\n\n"; + return $scrout; +} + +###################################################################### +###################################################################### + +=pod + +=item searchhelp() + +Inputs: none + +Outputs: return little blurb on how to enter searches + +=cut + +###################################################################### +###################################################################### +sub searchhelp { + return &mt('Enter terms or phrases separated by AND, OR, or NOT'); +} + +###################################################################### +###################################################################### + +=pod + +=item &get_persistent_form_data() + +Inputs: filename of database + +Outputs: returns undef on database errors. + +This function is the reverse of &make_persistent() for form data. +Retrieve persistent data from %persistent_db. Retrieved items will have their +values unescaped. If a form value already exists in $ENV, it will not be +overwritten. Form values that are array references may have values appended +to them. + +=cut + +###################################################################### +###################################################################### +sub get_persistent_form_data { + my $filename = shift; + return 0 if (! -e $filename); + return undef if (! tie(%persistent_db,'GDBM_File',$filename, + &GDBM_READER(),0640)); + # + # These make sure we do not get array references printed out as 'values'. + my %arrays_allowed = ('form.domains'=>1); + # + # Loop through the keys, looking for 'form.' + foreach my $name (keys(%persistent_db)) { + next if ($name !~ /^form./); + # Kludgification begins! + if ($name eq 'form.domains' && + $ENV{'form.searchmode'} eq 'basic' && + $ENV{'form.phase'} ne 'disp_basic') { + next; + } + # End kludge (hopefully) + next if (exists($ENV{$name})); + my @values = map { + &Apache::lonnet::unescape($_); + } split(',',$persistent_db{$name}); + next if (@values <1); + if ($arrays_allowed{$name}) { + $ENV{$name} = [@values]; + } else { + $ENV{$name} = $values[0] if ($values[0]); + } } + untie (%persistent_db); + return 1; +} + +###################################################################### +###################################################################### - %mimetag=(); - $mimetag{'any'}='Any type'; - { - my $fh=Apache::File->new($r->dir_config('lonTabDir').'/filetypes.tab'); - map { - $_=~/(\w+)\s+(\w+)\s+([\w\s\-]+)/; - $mimetag{$1}=".$1 $3"; - } <$fh>; +=pod + +=item &get_persistent_data() + +Inputs: filename of database, ref to array of values to recover. + +Outputs: array of values. Returns undef on error. + +This function is the reverse of &make_persistent(); +Retrieve persistent data from %persistent_db. Retrieved items will have their +values unescaped. If the item contains commas (before unescaping), the +returned value will be an array pointer. + +=cut + +###################################################################### +###################################################################### +sub get_persistent_data { + my $filename = shift; + my @Vars = @{shift()}; + my @Values; # Return array + return undef if (! -e $filename); + return undef if (! tie(%persistent_db,'GDBM_File',$filename, + &GDBM_READER(),0640)); + foreach my $name (@Vars) { + if (! exists($persistent_db{$name})) { + push @Values, undef; + next; + } + my @values = map { + &Apache::lonnet::unescape($_); + } split(',',$persistent_db{$name}); + if (@values <= 1) { + push @Values,$values[0]; + } else { + push @Values,\@values; + } } + untie (%persistent_db); + return @Values; +} + +###################################################################### +###################################################################### + +=pod + +=item &make_persistent() - if ($ENV{'form.basicsubmit'} eq 'SEARCH') { - return &basicsearch($r,\%ENV); +Inputs: Hash of values to save, filename of persistent database. + +Store variables away to the %persistent_db. +Values will be escaped. Values that are array pointers will have their +elements escaped and concatenated in a comma separated string. + +=cut + +###################################################################### +###################################################################### +sub make_persistent { + my %save = %{shift()}; + my $filename = shift; + return undef if (! tie(%persistent_db,'GDBM_File', + $filename,&GDBM_WRCREAT(),0640)); + foreach my $name (keys(%save)) { + my @values = (ref($save{$name}) ? @{$save{$name}} : ($save{$name})); + # We handle array references, but not recursively. + my $store = join(',', map { &Apache::lonnet::escape($_); } @values ); + $persistent_db{$name} = $store; } - elsif ($ENV{'form.advancedsubmit'} eq 'SEARCH') { - return &advancedsearch($r,\%ENV); + untie(%persistent_db); + return 1; +} + +###################################################################### +###################################################################### + +=pod + +=item &make_form_data_persistent() + +Inputs: filename of persistent database. + +Store most form variables away to the %persistent_db. +Values will be escaped. Values that are array pointers will have their +elements escaped and concatenated in a comma separated string. + +=cut + +###################################################################### +###################################################################### +sub make_form_data_persistent { + my $r = shift; + my $filename = shift; + my %save; + foreach (keys(%ENV)) { + next if (!/^form/ || /submit/); + $save{$_} = $ENV{$_}; } + return &make_persistent(\%save,$filename); +} - $scrout=''; # building a part of screen output - $scrout.=&searchphrasefield('Limit by title','title', - $ENV{'form.title'}); +###################################################################### +###################################################################### - $scrout.=&searchphrasefield('Limit by author','author', - $ENV{'form.author'}); +=pod - $scrout.=&searchphrasefield('Limit by subject','subject', - $ENV{'form.subject'}); +=item &parse_advanced_search() - $scrout.=&searchphrasefield('Limit by keywords','keywords', - $ENV{'form.keywords'}); +Parse advanced search form and return the following: - $scrout.=&searchphrasefield('Limit by URL','url', - $ENV{'form.url'}); +=over 4 - $scrout.=&searchphrasefield('Limit by version','version', - $ENV{'form.version'}); +=item $query Scalar containing an SQL query. - $scrout.=&searchphrasefield('Limit by notes','notes', - $ENV{'form.notes'}); +=item $customquery Scalar containing a custom query. - $scrout.=&searchphrasefield('Limit by abstract','abstract', - $ENV{'form.abstract'}); +=item $customshow Scalar containing commands to show custom metadata. - $ENV{'form.mime'}='notxxx' unless length($ENV{'form.mime'}); - $scrout.=&selectbox('Limit by MIME type','mime', - $ENV{'form.mime'},%mimetag); +=item $libraries_to_query Reference to array of domains to search. - $ENV{'form.language'}='any' unless length($ENV{'form.language'}); +=back - $scrout.=&selectbox('Limit by language','language', - $ENV{'form.language'},%language); - +=cut -# ------------------------------------------------ Compute date selection boxes - $scrout.=< -LIMIT BY CREATION DATE RANGE: - -
-between: -CREATIONDATESTART - $scrout.=&dateboxes('creationdatestart',1,1,1976, +###################################################################### +###################################################################### +sub parse_advanced_search { + my ($r,$closebutton,$hidden_fields)=@_; + my $fillflag=0; + my $pretty_search_string = "
\n"; + # Clean up fields for safety + for my $field ('title','author','subject','keywords','url','version', + 'creationdatestart_month','creationdatestart_day', + 'creationdatestart_year','creationdateend_month', + 'creationdateend_day','creationdateend_year', + 'lastrevisiondatestart_month','lastrevisiondatestart_day', + 'lastrevisiondatestart_year','lastrevisiondateend_month', + 'lastrevisiondateend_day','lastrevisiondateend_year', + 'notes','abstract','extension','language','owner', + 'custommetadata','customshow','category') { + $ENV{"form.$field"}=~s/[^\w\/\s\(\)\=\-\"\']//g; + } + foreach ('mode','form','element') { + # is this required? Hmmm. + next unless (exists($ENV{"form.$_"})); + $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"}); + $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g; + } + # Preprocess the category form element. + $ENV{'form.category'} = 'any' if (! defined($ENV{'form.category'}) || + ref($ENV{'form.category'})); + # + # Check to see if enough information was filled in + for my $field ('title','author','subject','keywords','url','version', + 'notes','abstract','category','extension','language', + 'owner','custommetadata') { + if (&filled($ENV{"form.$field"})) { + $fillflag++; + } + } + unless ($fillflag) { + &output_blank_field_error($r,$closebutton, + 'phase=disp_adv',$hidden_fields); + return ; + } + # Turn the form input into a SQL-based query + my $query=''; + my @queries; + my $font = ''; + # Evaluate logical expression AND/OR/NOT phrase fields. + foreach my $field ('title','author','subject','notes','abstract','url', + 'keywords','version','owner','standards') { + if ($ENV{'form.'.$field}) { + my $searchphrase = $ENV{'form.'.$field}; + $pretty_search_string .= $font."$field contains ". + $searchphrase.""; + if ($ENV{'form.'.$field.'_related'}) { + my @New_Words; + ($searchphrase,@New_Words) = &related_version($searchphrase); + if (@New_Words) { + $pretty_search_string .= " with related words: ". + "@New_Words."; + } else { + $pretty_search_string .= " with no related words."; + } + } + $pretty_search_string .= "
\n"; + push @queries,&build_SQL_query($field,$searchphrase); + } + } + # + # Make the 'mime' from 'form.category' and 'form.extension' + # + my $searchphrase; + if (exists($ENV{'form.category'}) && + $ENV{'form.category'} !~ /^\s*$/ && + $ENV{'form.category'} ne 'any') { + my @extensions = &Apache::loncommon::filecategorytypes + ($ENV{'form.category'}); + if (scalar(@extensions) > 0) { + $searchphrase = join(' OR ',@extensions); + } + } + if (exists($ENV{'form.extension'}) && $ENV{'form.extension'} !~ /^\s*$/) { + $searchphrase .= ' OR ' if (defined($searchphrase)); + my @extensions = split(/,/,$ENV{'form.extension'}); + $searchphrase .= join(' OR ',@extensions); + } + if (defined($searchphrase)) { + push @queries,&build_SQL_query('mime',$searchphrase); + $pretty_search_string .=$font.'mime contains '. + $searchphrase.'
'; + } + # + # Evaluate option lists + if ($ENV{'form.language'} and $ENV{'form.language'} ne 'any') { + push @queries,"(language like \"$ENV{'form.language'}\")"; + $pretty_search_string.=$font."language= ". + &Apache::loncommon::languagedescription($ENV{'form.language'}). + "
\n"; + } + if ($ENV{'form.copyright'} and $ENV{'form.copyright'} ne 'any') { + push @queries,"(copyright like \"$ENV{'form.copyright'}\")"; + $pretty_search_string.=$font."copyright = ". + &Apache::loncommon::copyrightdescription($ENV{'form.copyright'}). + "
\n"; + } + # + # Evaluate date windows + my $datequery=&build_date_queries( $ENV{'form.creationdatestart_month'}, $ENV{'form.creationdatestart_day'}, $ENV{'form.creationdatestart_year'}, - ); - $scrout.=< -LIMIT BY LAST REVISION DATE RANGE: - -
between: -LASTREVISIONDATESTART - $scrout.=&dateboxes('lastrevisiondatestart',1,1,1976, $ENV{'form.lastrevisiondatestart_month'}, $ENV{'form.lastrevisiondatestart_day'}, $ENV{'form.lastrevisiondatestart_year'}, - ); - $scrout.=<: ". + # $ENV{'form.custommetadata'}."
\n"; + # $customquery=&build_custommetadata_query('custommetadata', + # $ENV{'form.custommetadata'}); + # } + my $customshow=undef; + # if ($ENV{'form.customshow'}) { + # $pretty_search_string .=$font."Custom Metadata Display: ". + # $ENV{'form.customshow'}."
\n"; + # $customshow=$ENV{'form.customshow'}; + # $customshow=~s/[^\w\s]//g; + # my @fields=split(/\s+/,$customshow); + # $customshow=join(" ",@fields); + # } + ## + ## Deal with restrictions to given domains + ## + my ($libraries_to_query,$pretty_domains_string) = + &parse_domain_restrictions(); + $pretty_search_string .= $pretty_domains_string."
\n"; + # + if (@queries) { + $query=join(" AND ",@queries); + $query="select * from metadata where $query"; + } elsif ($customquery) { + $query = ''; + } + return ($query,$customquery,$customshow,$libraries_to_query, + $pretty_search_string); +} - $scrout.=&searchphrasefield('Limit by publisher/owner','owner', - $ENV{'form.owner'}); -# $metadatafields{'owner'}); +sub parse_domain_restrictions { + my $libraries_to_query = undef; + # $ENV{'form.domains'} can be either a scalar or an array reference. + # We need an array. + if (! exists($ENV{'form.domains'})) { + return (undef,''); + } + my @allowed_domains; + if (ref($ENV{'form.domains'})) { + @allowed_domains = @{$ENV{'form.domains'}}; + } else { + @allowed_domains = ($ENV{'form.domains'}); + } + # + my %domain_hash = (); + my $pretty_domains_string; + foreach (@allowed_domains) { + $domain_hash{$_}++; + } + if ($domain_hash{'any'}) { + $pretty_domains_string = "In all LON-CAPA domains."; + } else { + if (@allowed_domains > 1) { + $pretty_domains_string = "In LON-CAPA domains:"; + } else { + $pretty_domains_string = "In LON-CAPA domain "; + } + foreach (sort @allowed_domains) { + $pretty_domains_string .= "".$_." "; + } + foreach (keys(%Apache::lonnet::libserv)) { + if (exists($domain_hash{$Apache::lonnet::hostdom{$_}})) { + push @$libraries_to_query,$_; + } + } + } + return ($libraries_to_query,$pretty_domains_string); +} - $ENV{'form.copyright'}='any' unless length($ENV{'form.copyright'}); - $scrout.=&selectbox('Limit by copyright/distribution','copyright', - $ENV{'form.copyright'},%cprtag); +###################################################################### +###################################################################### -# ------------------------------------------- Compute customized metadata field - $scrout.=< -LIMIT BY OTHER METADATA FIELDS: - -For author-specific metadata, enter in an expression in the form of -key=value separated by operators such as AND or OR.
-Example: grandmother=75 OR grandfather=85 -
-CUSTOMMETADATA -$scrout.=&simpletextfield('custommetadata',$ENV{'form.custommetadata'}); -$scrout.=' initial users of this system do not need to worry about this option'; +=pod + +=item &parse_basic_search() + +Parse the basic search form and return a scalar containing an sql query. + +=cut + +###################################################################### +###################################################################### +sub parse_basic_search { + my ($r,$closebutton)=@_; + # + # Clean up fields for safety + for my $field ('basicexp') { + $ENV{"form.$field"}=~s/[^\w\s\(\)\-]//g; + } + foreach ('mode','form','element') { + # is this required? Hmmm. + next unless (exists($ENV{"form.$_"})); + $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"}); + $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g; + } + my ($libraries_to_query,$pretty_domains_string) = + &parse_domain_restrictions(); + # + # Check to see if enough of a query is filled in + unless (&filled($ENV{'form.basicexp'})) { + &output_blank_field_error($r,$closebutton,'phase=disp_basic'); + return OK; + } + my $pretty_search_string = ''.$ENV{'form.basicexp'}.''; + my $search_string = $ENV{'form.basicexp'}; + if ($ENV{'form.related'}) { + my @New_Words; + ($search_string,@New_Words) = &related_version($ENV{'form.basicexp'}); + if (@New_Words) { + $pretty_search_string .= " with related words: @New_Words."; + } else { + $pretty_search_string .= " with no related words."; + } + } + # + # Build SQL query string based on form page + my $query=''; + my $concatarg=join(',', + ('title', 'author', 'subject', 'notes', 'abstract', + 'keywords')); + $concatarg='title' if $ENV{'form.titleonly'}; + $query=&build_SQL_query('concat_ws(" ",'.$concatarg.')',$search_string); + if (defined($pretty_domains_string) && $pretty_domains_string ne '') { + $pretty_search_string .= ' '.$pretty_domains_string; + } + $pretty_search_string .= "
\n"; + my $final_query = 'SELECT * FROM metadata WHERE '.$query; + # &Apache::lonnet::logthis($final_query); + return ($final_query,$pretty_search_string, + $libraries_to_query); +} + +###################################################################### +###################################################################### + +=pod + +=item &related_version() + +Modifies an input string to include related words. Words in the string +are replaced with parenthesized lists of 'OR'd words. For example +"torque" is replaced with "(torque OR word1 OR word2 OR ...)". + +Note: Using this twice on a string is probably silly. + +=cut + +###################################################################### +###################################################################### +sub related_version { + my $search_string = shift; + my $result = $search_string; + my %New_Words = (); + while ($search_string =~ /(\w+)/cg) { + my $word = $1; + next if (lc($word) =~ /\b(or|and|not)\b/); + my @Words = &Apache::loncommon::get_related_words($word); + @Words = ($#Words>4? @Words[0..4] : @Words); + foreach (@Words) { $New_Words{$_}++;} + my $replacement = join " OR ", ($word,@Words); + $result =~ s/(\b)$word(\b)/$1($replacement)$2/g; + } + return $result,sort(keys(%New_Words)); +} + +###################################################################### +###################################################################### + +=pod + +=item &build_SQL_query() + +Builds a SQL query string from a logical expression with AND/OR keywords +using Text::Query and &recursive_SQL_query_builder() + +=cut + +###################################################################### +###################################################################### +sub build_SQL_query { + my ($field_name,$logic_statement)=@_; + my $q=new Text::Query('abc', + -parse => 'Text::Query::ParseAdvanced', + -build => 'Text::Query::Build'); + $q->prepare($logic_statement); + my $matchexp=${$q}{'matchexp'}; chomp $matchexp; + my $sql_query=&recursive_SQL_query_build($field_name,$matchexp); + return $sql_query; +} + +###################################################################### +###################################################################### + +=pod + +=item &build_custommetadata_query() + +Constructs a custom metadata query using a rather heinous regular +expression. + +=cut + +###################################################################### +###################################################################### +sub build_custommetadata_query { + my ($field_name,$logic_statement)=@_; + my $q=new Text::Query('abc', + -parse => 'Text::Query::ParseAdvanced', + -build => 'Text::Query::BuildAdvancedString'); + $q->prepare($logic_statement); + my $matchexp=${$q}{'-parse'}{'-build'}{'matchstring'}; + # quick fix to change literal into xml tag-matching + # will eventually have to write a separate builder module + # wordone=wordtwo becomes\[^\<] *wordtwo[^\<]*\<\/wordone\> + $matchexp =~ s/(\w+)\\=([\w\\\+]+)?# wordone=wordtwo is changed to + /\\<$1\\>?# \ + \[\^\\<\]?# [^\<] + \*$2\[\^\\<\]?# *wordtwo[^\<] + \*\\<\\\/$1\\>?# *\<\/wordone\> + /g; + return $matchexp; +} + +###################################################################### +###################################################################### + +=pod + +=item &recursive_SQL_query_build() + +Recursively constructs an SQL query. Takes as input $dkey and $pattern. + +=cut + +###################################################################### +###################################################################### +sub recursive_SQL_query_build { + my ($dkey,$pattern)=@_; + my @matches=($pattern=~/(\[[^\]|\[]*\])/g); + return $pattern unless @matches; + foreach my $match (@matches) { + $match=~/\[ (\w+)\s(.*) \]/; + my ($key,$value)=($1,$2); + my $replacement=''; + if ($key eq 'literal') { + $replacement="($dkey LIKE \"\%$value\%\")"; + } elsif (lc($key) eq 'not') { + $value=~s/LIKE/NOT LIKE/; +# $replacement="($dkey not like $value)"; + $replacement="$value"; + } elsif ($key eq 'and') { + $value=~/(.*[\"|\)]) ([|\(|\^].*)/; + $replacement="($1 AND $2)"; + } elsif ($key eq 'or') { + $value=~/(.*[\"|\)]) ([|\(|\^].*)/; + $replacement="($1 OR $2)"; + } + substr($pattern, + index($pattern,$match), + length($match), + $replacement); + } + &recursive_SQL_query_build($dkey,$pattern); +} + +###################################################################### +###################################################################### -# ---------------------------------------------------------------- Print screen - $r->print(<$cnumeric2) { + return "Incorrect entry for the creation date. The starting ". + "date must occur before the ending date."; + } + my $cquery="(creationdate BETWEEN '$cyear1-$cmonth1-$cday1' AND '". + "$cyear2-$cmonth2-$cday2 23:59:59')"; + push @queries,$cquery; + } + if ($lmonth1 or $lday1 or $lyear1 or $lmonth2 or $lday2 or $lyear2) { + unless ($lmonth1 and $lday1 and $lyear1 and + $lmonth2 and $lday2 and $lyear2) { + return "Incorrect entry for the last revision date. You must ". + "specify a starting month, day, and year and an ending ". + "month, day, and year."; + } + my $lnumeric1=sprintf("%d%2d%2d",$lyear1,$lmonth1,$lday1); + $lnumeric1+=0; + my $lnumeric2=sprintf("%d%2d%2d",$lyear2,$lmonth2,$lday2); + $lnumeric2+=0; + if ($lnumeric1>$lnumeric2) { + return "Incorrect entry for the last revision date. The ". + "starting date must occur before the ending date."; + } + my $lquery="(lastrevisiondate BETWEEN '$lyear1-$lmonth1-$lday1' AND '". + "$lyear2-$lmonth2-$lday2 23:59:59')"; + push @queries,$lquery; + } + if (@queries) { + return join(" AND ",@queries); + } + return ''; +} + +###################################################################### +###################################################################### + +=pod + +=item ©right_check() + +Inputs: $Metadata, a hash pointer of metadata for a resource. + +Returns: 1 if the resource is available to the user making the query, + 0 otherwise. + +=cut + +###################################################################### +###################################################################### +sub copyright_check { + my $Metadata = shift; + # Check copyright tags and skip results the user cannot use + my (undef,undef,$resdom,$resname) = split('/', + $Metadata->{'url'}); + # Check for priv + if (($Metadata->{'copyright'} eq 'priv') && + (($ENV{'user.name'} ne $resname) && + ($ENV{'user.domain'} ne $resdom))) { + return 0; + } + # Check for domain + if (($Metadata->{'copyright'} eq 'domain') && + ($ENV{'user.domain'} ne $resdom)) { + return 0; + } + return 1; +} + +###################################################################### +###################################################################### + +=pod + +=item &ensure_db_and_table() + +Ensure we can get lonmysql to connect to the database and the table we +need exists. + +Inputs: $r, table id + +Returns: undef on error, 1 if the table exists. + +=cut + +###################################################################### +###################################################################### +sub ensure_db_and_table { + my ($r,$table) = @_; + ## + ## Sanity check the table id. + ## + if (! defined($table) || $table eq '' || $table =~ /\D/ ) { + $r->print("Unable to retrieve search results. ". + "Unable to determine the table results were stored in. ". + ""); + return undef; + } + ## + ## Make sure we can connect and the table exists. + ## + my $connection_result = &Apache::lonmysql::connect_to_db(); + if (!defined($connection_result)) { + $r->print("Unable to connect to the MySQL database where your results". + " are stored. "); + &Apache::lonnet::logthis("lonsearchcat: unable to get lonmysql to". + " connect to database."); + &Apache::lonnet::logthis(&Apache::lonmysql::get_error()); + return undef; + } + my $table_check = &Apache::lonmysql::check_table($table); + if (! defined($table_check)) { + $r->print("A MySQL error has occurred."); + &Apache::lonnet::logthis("lonmysql was unable to determine the status". + " of table ".$table); + return undef; + } elsif (! $table_check) { + $r->print("The table of results could not be found."); + &Apache::lonnet::logthis("The user requested a table, ".$table. + ", that could not be found."); + return undef; + } + return 1; +} + +###################################################################### +###################################################################### + +=pod + +=item &print_sort_form() + +The sort feature is not implemented at this time. This form just prints +a link to change the search query. + +=cut + +###################################################################### +###################################################################### +sub print_sort_form { + my ($r,$pretty_query_string) = @_; + my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1); + ## + my %SortableFields=&Apache::lonlocal::texthash( + id => 'Default', + title => 'Title', + author => 'Author', + subject => 'Subject', + url => 'URL', + version => 'Version Number', + mime => 'Mime type', + lang => 'Language', + owner => 'Owner/Publisher', + copyright => 'Copyright', + hostname => 'Host', + creationdate => 'Creation Date', + lastrevisiondate => 'Revision Date' + ); + ## + my $table = $ENV{'form.table'}; + return if (! &ensure_db_and_table($r,$table)); + ## + ## Get the number of results + ## + my $total_results = &Apache::lonmysql::number_of_rows($table); + if (! defined($total_results)) { + $r->print("A MySQL error has occurred."); + &Apache::lonnet::logthis("lonmysql was unable to determine the number". + " of rows in table ".$table); + &Apache::lonnet::logthis(&Apache::lonmysql::get_error()); + return; + } + my $result; + $result.=< -The LearningOnline Network with CAPA + +Results - - -

Search Catalog

-
-$hidden -
-

Basic Search

-

-Enter terms or phrases separated by search operators -such as AND or OR then press SEARCH below. Terms should be specific -to the title, author, subject, notes, or abstract information associated -with a resource. -
-ENDDOCUMENT - $r->print(&simpletextfield('basicexp',$ENV{'form.basicexp'})); - $r->print(' '); - $r->print(&simplecheckbox('titleonly',$ENV{'form.titleonly'})); - $r->print('Title only '); - $r->print(&simplecheckbox('allversions',$ENV{'form.allversions'})); - $r->print(<Search historic archives -
- - - -

-
-

Advanced Search

-$scrout -

- - - +$bodytag + + +END + +#

Sort Results

+#Sort by: '; -} - -sub simpletextfield { - my ($name,$value)=@_; - return ''; -} - -sub simplecheckbox { - my ($name,$value)=@_; - my $checked=''; - $checked="CHECKED" if $value eq 'on'; - return ''; -} - -sub searchphrasefield { - my ($title,$name,$value)=@_; - my $instruction=<$uctitle:". - " $instruction
". - ''; -} - -sub dateboxes { - my ($name,$defaultmonth,$defaultday,$defaultyear, - $currentmonth,$currentday,$currentyear)=@_; - ($defaultmonth,$defaultday,$defaultyear)=('','',''); - my $month=< - - - - - - - - - - - - - - -END - $month=~s/(\"$currentmonth\")/$1 SELECTED/ if length($currentmonth); - my $day=< - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -END - $day=~s/(\"$currentday\")/$1 SELECTED/ if length($currentday); - my $year=< - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -END - $year=~s/(\"$currentyear\")/$1 SELECTED/ if length($currentyear); - return "$month$day$year"; -} - -sub selectbox { - my ($title,$name,$value,%options)=@_; - my $uctitle=uc($title); - my $selout="\n

$uctitle:". - "
".''; -} - -# ------------------------------------------------ Performing a advanced search -sub advancedsearch { - my ($r,$envhash)=@_; - my %ENV=%{$envhash}; - -} - -# --------------------------------------------------- Performing a basic search -sub basicsearch { - my ($r,$envhash)=@_; - my %ENV=%{$envhash}; - - my $query=$ENV{'form.basicexp'}; - $query="select * from metadata where concat(title,\" \",author) like '\%$ENV{'form.basicexp'}\%'"; - my $reply=&Apache::lonnet::metadata_query($query); - &output_results($r,$envhash,$reply); - return OK; +=pod + +=item MySQL Table Description + +MySQL table creation requires a precise description of the data to be +stored. The use of the correct types to hold data is vital to efficient +storage and quick retrieval of records. The columns must be described in +the following format: + +=cut + +##################################################################### +##################################################################### +# +# These should probably be scoped but I don't have time right now... +# +my @Datatypes; +my @Fullindicies; + +###################################################################### +###################################################################### + +=pod + +=item &create_results_table() + +Creates the table of search results by calling lonmysql. Stores the +table id in $ENV{'form.table'} + +Inputs: none. + +Returns: the identifier of the table on success, undef on error. + +=cut + +###################################################################### +###################################################################### +sub set_up_table_structure { + my ($datatypes,$fullindicies) = + &LONCAPA::lonmetadata::describe_metadata_storage(); + unshift(@$datatypes,{name => 'id', + type => 'MEDIUMINT', + restrictions => 'UNSIGNED NOT NULL', + primary_key => 'yes', + auto_inc => 'yes' }); + @Datatypes = @{$datatypes}; + @Fullindicies = @{$fullindicies}; + return; } -# ----------------------------- format and output results based on a reply list -sub output_results { - my ($r,$envhash,@replylist)=@_; - my %ENV=%{$envhash}; - foreach my $reply (@replylist) { - - my @results; - - my $replyfile=''; - $reply=~/^([\.\w]+)$/; # must do since 'use strict' checks for tainting - $replyfile=$r->dir_config('lonDaemons').'/tmp/'.$1; - $reply=~/(.*?)\_/; - my $hostname=$1; - - { - while (1) { - last if -e $replyfile; - sleep 1; - } - # QUESTION: how should I handle this error condition.. - # I'm sure there is syntax elsewhere I can use.. - my $fh=Apache::File->new($replyfile) or - ($r->print('file cannot be opened') and return OK); - @results=<$fh>; - } +sub create_results_table { + &set_up_table_structure(); + my $table = &Apache::lonmysql::create_table + ( { columns => \@Datatypes, + FULLTEXT => [{'columns' => \@Fullindicies},], + } ); + if (defined($table)) { + $ENV{'form.table'} = $table; + return $table; + } + return undef; # Error... +} - my $compiledresult=''; +###################################################################### +###################################################################### - foreach my $result (@results) { - my ($title,$author,$subject,$url,$keywords,$version, - $notes,$abstract,$mime,$lang, - $creationdate,$lastrevisiondate,$owner,$copyright - )=map {&Apache::lonnet::unescape($_)} (split(/\,/,$result)); - my $shortabstract=$abstract; - $shortabstract=substr($abstract,0,200) if length($abstract)>200; - $compiledresult.=< +=pod + +=item Search Status update functions + +Each of the following functions changes the values of one of the +input fields used to display the search status to the user. The names +should be explanatory. + +Inputs: Apache request handler ($r), text to display. + +Returns: Nothing. + +=over 4 + +=item &update_count_status() + +=item &update_status() + +=item &update_seconds() + +=back + +=cut + +###################################################################### +###################################################################### +sub update_count_status { + my ($r,$text) = @_; + $text =~ s/\'/\\\'/g; + $r->print + ("\n"); + $r->rflush(); +} + +sub update_status { + my ($r,$text) = @_; + $text =~ s/\'/\\\'/g; + $r->print + ("\n"); + $r->rflush(); +} + +sub update_seconds { + my ($r,$text) = @_; + $text =~ s/\'/\\\'/g; + $r->print + ("\n"); + $r->rflush(); +} + +###################################################################### +###################################################################### + +=pod + +=item &revise_button() + +Inputs: None + +Returns: html string for a 'revise search' button. + +=cut + +###################################################################### +###################################################################### +sub revise_button { + my $revise_phase = 'disp_basic'; + $revise_phase = 'disp_adv' if ($ENV{'form.searchmode'} eq 'advanced'); + my $newloc = '/adm/searchcat'. + '?persistent_db_id='.$ENV{'form.persistent_db_id'}. + '&cleargroupsort=1'. + '&phase='.$revise_phase; + my $result = qq{ }; + return $result; +} + +###################################################################### +###################################################################### + +=pod + +=item &run_search() + +Executes a search query by sending it the the other servers and putting the +results into MySQL. + +=cut + +###################################################################### +###################################################################### +sub run_search { + my ($r,$query,$customquery,$customshow,$serverlist,$pretty_string) = @_; + my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1); + my $connection = $r->connection; + # + # Timing variables + # + my $starttime = time; + my $max_time = 30; # seconds for the search to complete + # + # Print run_search header + # + $r->print(< +Search Status +$bodytag + + END - $compiledresult.=< s and truncate the value. + # (there is probably a better way)... + my @Lines = split /
/,$pretty_string; + if (@Lines > 2) { + $pretty_string = join '
',(@Lines[0..2],'....
'); + } + $r->print(&mt("Search").": ".$pretty_string); + $r->rflush(); + # + # Determine the servers we need to contact. + my @Servers_to_contact; + if (defined($serverlist)) { + if (ref($serverlist) eq 'ARRAY') { + @Servers_to_contact = @$serverlist; + } else { + @Servers_to_contact = ($serverlist); + } + } else { + @Servers_to_contact = sort(keys(%Apache::lonnet::libserv)); + } + my %Server_status; + my $table =$ENV{'form.table'}; + if (! defined($table) || $table eq '' || $table =~ /\D/ ) { + $r->print("Unable to determine table id to store search results in.". + "The search has been aborted."); + return; + } + my $table_status = &Apache::lonmysql::check_table($table); + if (! defined($table_status)) { + $r->print("Unable to determine status of table."); + &Apache::lonnet::logthis("Bogus table id of $table for ". + "$ENV{'user.name'} @ $ENV{'user.domain'}"); + &Apache::lonnet::logthis("lonmysql error = ". + &Apache::lonmysql::get_error()); + return; + } + if (! $table_status) { + &Apache::lonnet::logthis("lonmysql error = ". + &Apache::lonmysql::get_error()); + &Apache::lonnet::logthis("lonmysql debug = ". + &Apache::lonmysql::get_debug()); + &Apache::lonnet::logthis('table status = "'.$table_status.'"'); + $r->print("The table id,$table, we tried to use is invalid.". + "The search has been aborted."); + return; + } + ## + ## Prepare for the big loop. + my $hitcountsum; + my $server; + my $status; + my $revise = &revise_button(); + $r->print(< +StatusTotal MatchesTime Remaining + + + + +$revise + + + +END + $r->rflush(); + my $time_remaining = $max_time - (time - $starttime) ; + my $last_time = $time_remaining; + &update_seconds($r,$time_remaining); + &update_status($r,'contacting '.$Servers_to_contact[0]); + while (($time_remaining > 0) && + ((@Servers_to_contact) || keys(%Server_status))) { + # Send out a search request if it needs to be done. + if (@Servers_to_contact) { + # Contact one server + my $server = shift(@Servers_to_contact); + &update_status($r,&mt('contacting').' '.$server); + my $reply=&Apache::lonnet::metadata_query($query,$customquery, + $customshow,[$server]); + ($server) = keys(%$reply); + $Server_status{$server} = $reply->{$server}; + } else { + # wait a sec. to give time for files to be written + # This sleep statement is here instead of outside the else + # block because we do not want to pause if we have servers + # left to contact. + if (scalar (keys(%Server_status))) { + &update_status($r, + &mt('waiting on').' '.(join(' ',keys(%Server_status)))); + } + sleep(1); + } + # + # Loop through the servers we have contacted but do not + # have results from yet, looking for results. + while (my ($server,$status) = each(%Server_status)) { + last if ($connection->aborted()); + if ($status eq 'con_lost') { + delete ($Server_status{$server}); + next; + } + $status=~/^([\.\w]+)$/; + my $datafile=$r->dir_config('lonDaemons').'/tmp/'.$1; + if (-e $datafile && ! -e "$datafile.end") { + &update_status($r,&mt('Receiving results from').' '.$server); + next; + } + last if ($connection->aborted()); + if (-e "$datafile.end") { + &update_status($r,&mt('Reading results from').' '.$server); + if (-z "$datafile") { + delete($Server_status{$server}); + next; + } + my $fh; + if (!($fh=Apache::File->new($datafile))) { + $r->print("Unable to open search results file for ". + "server $server. Omitting from search"); + delete($Server_status{$server}); + next; + } + # Read in the whole file. + while (my $result = <$fh>) { + last if ($connection->aborted()); + # handle custom fields? Someday we will! + chomp($result); + next unless $result; + # Parse the result. + my %Fields = &parse_raw_result($result,$server); + $Fields{'hostname'} = $server; + next if (! ©right_check(\%Fields)); + # Store the result in the mysql database + my $result = &Apache::lonmysql::store_row($table,\%Fields); + if (! defined($result)) { + $r->print(&Apache::lonmysql::get_error()); + } + # $r->print(&Apache::lonmysql::get_debug()); + $hitcountsum ++; + $time_remaining = $max_time - (time - $starttime) ; + if ($last_time - $time_remaining > 0) { + &update_seconds($r,$time_remaining); + $last_time = $time_remaining; + } + if ($hitcountsum % 50 == 0) { + &update_count_status($r,$hitcountsum); + } + } # End of foreach (@results) + $fh->close(); + # $server is only deleted if the results file has been + # found and (successfully) opened. This may be a bad idea. + delete($Server_status{$server}); + } + last if ($connection->aborted()); + &update_count_status($r,$hitcountsum); + } + last if ($connection->aborted()); + # Finished looping through the servers + $starttime = time if (@Servers_to_contact); + $time_remaining = $max_time - (time - $starttime) ; + if ($last_time - $time_remaining > 0) { + $last_time = $time_remaining; + &update_seconds($r,$time_remaining); + } + } + &update_status($r,&mt('Search Complete').$server); + &update_seconds($r,0); + # + &Apache::lonmysql::disconnect_from_db(); + # + # We have run out of time or run out of servers to talk to and + # results to get. + $r->print(""); + if ($ENV{'form.catalogmode'} ne 'groupsearch') { + $r->print(""); + } + return; +} + +###################################################################### +###################################################################### + +=pod + +=item &prev_next_buttons() + +Returns html for the previous and next buttons on the search results page. + +=cut + +###################################################################### +###################################################################### +sub prev_next_buttons { + my ($current_min,$show,$total,$parms) = @_; + return '' if ($show eq 'all'); # No links if you get them all at once. + my $links; + ## + ## Prev + my $prev_min = $current_min - $show; + $prev_min = 1 if $prev_min < 1; + if ($prev_min < $current_min) { + $links .= + qq{}. + &mt('prev').''; + } else { + $links .= &mt('prev'); + } + ## + ## Pages.... Someday. + ## + $links .= + qq{  + }. + &mt('reload').''; + ## + ## Next + my $next_min = $current_min + $show; + $next_min = $current_min if ($next_min > $total); + if ($next_min != $current_min) { + $links .= + qq{  + }. + &mt('next').''; + } else { + $links .= ' '.&mt('next'); + } + return $links; +} + +###################################################################### +###################################################################### + +=pod + +=item &display_results() + +Prints the results out for selection and perusal. + +=cut + +###################################################################### +###################################################################### +sub display_results { + my ($r,$importbutton,$closebutton,$diropendb) = @_; + my $connection = $r->connection; + $r->print(&search_results_header($importbutton,$closebutton)); + ## + ## Set viewing function + ## + my $viewfunction = $Views{$ENV{'form.viewselect'}}; + if (!defined($viewfunction)) { + $r->print("Internal Error - Bad view selected.\n"); + $r->rflush(); + return; + } + ## + ## $checkbox_num is a count of the number of checkboxes output on the + ## page this is used only during catalogmode=groupsearch. + my $checkbox_num = 0; + ## + ## Get the catalog controls setup + ## + my $action = "/adm/searchcat?phase=results"; + ## + ## Deal with groupsearch by opening the groupsearch db file. + if ($ENV{'form.catalogmode'} eq 'groupsearch') { + if (! tie(%groupsearch_db,'GDBM_File',$diropendb, + &GDBM_WRCREAT(),0640)) { + $r->print('Unable to store import results.'); + $r->rflush(); + return; + } + } + ## + ## Prepare the table for querying + my $table = $ENV{'form.table'}; + return if (! &ensure_db_and_table($r,$table)); + ## + ## Get the number of results + my $total_results = &Apache::lonmysql::number_of_rows($table); + if (! defined($total_results)) { + $r->print("A MySQL error has occurred."); + &Apache::lonnet::logthis("lonmysql was unable to determine the number". + " of rows in table ".$table); + &Apache::lonnet::logthis(&Apache::lonmysql::get_error()); + return; + } + ## + ## Determine how many results we need to get + $ENV{'form.start'} = 1 if (! exists($ENV{'form.start'})); + $ENV{'form.show'} = 'all' if (! exists($ENV{'form.show'})); + my $min = $ENV{'form.start'}; + my $max; + if ($ENV{'form.show'} eq 'all') { + $max = $total_results ; + } else { + $max = $min + $ENV{'form.show'} - 1; + $max = $total_results if ($max > $total_results); + } + ## + ## Output links (if necessary) for 'prev' and 'next' pages. + $r->print + ('

'. + &prev_next_buttons($min,$ENV{'form.show'},$total_results, + "table=".$ENV{'form.table'}. + "&phase=results". + "&persistent_db_id=".$ENV{'form.persistent_db_id'}) + ."
\n" + ); + if ($total_results == 0) { + $r->print(''. + '

'.&mt('There are currently no results').'.

'. + ""); + return; + } else { + $r->print + ("
Results $min to $max out of $total_results
\n"); + } + ## + ## Get results from MySQL table + my @Results = &Apache::lonmysql::get_rows($table, + 'id>='.$min.' AND id<='.$max); + ## + ## Loop through the results and output them. + foreach my $row (@Results) { + if ($connection->aborted()) { + &cleanup(); + return; + } + my %Fields = %{&parse_row(@$row)}; + my $output="

\n"; + my $prefix=&catalogmode_output($Fields{'title'},$Fields{'url'}, + $Fields{'id'},$checkbox_num++); + # Render the result into html + $output.= &$viewfunction($prefix,%Fields); + # Print them out as they come in. + $r->print($output); + $r->rflush(); + } + if (@Results < 1) { + $r->print(&mt("There were no results matching your query")); + } else { + $r->print + ('

'. + &prev_next_buttons($min,$ENV{'form.show'},$total_results, + "table=".$ENV{'form.table'}. + "&phase=results". + "&persistent_db_id=". + $ENV{'form.persistent_db_id'}) + ."
\n" + ); + } + $r->print(""); + $r->rflush(); + untie %groupsearch_db if (tied(%groupsearch_db)); + return; +} + +###################################################################### +###################################################################### + +=pod + +=item &catalogmode_output($title,$url,$fnum,$checkbox_num) + +Returns html needed for the various catalog modes. Gets inputs from +$ENV{'form.catalogmode'}. Stores data in %groupsearch_db. + +=cut + +###################################################################### +###################################################################### +sub catalogmode_output { + my $output = ''; + my ($title,$url,$fnum,$checkbox_num) = @_; + if ($ENV{'form.catalogmode'} eq 'interactive') { + $title=~ s/\'/\\\'/g; + if ($ENV{'form.catalogmode'} eq 'interactive') { + $output.=< -
END - $compiledresult.=<URL: $url -
-Title: $title
-Author(s): $author
-Subject: $subject
-Keyword(s): $keywords
-Notes: $notes
-Abstract: $shortabstract
-MIME Type: $mimetag{$mime}
-Language: $language{$lang}
-Creation Date: $creationdate
-Last Revision Date: $lastrevisiondate
-Publisher/Owner: $owner
-Copyright/Distribution: $copyright
-Repository Location: $hostname -

+ } + } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') { + $groupsearch_db{"pre_${fnum}_link"}=$url; + $groupsearch_db{"pre_${fnum}_title"}=$title; + $output.=< + + END + } + return $output; +} +###################################################################### +###################################################################### + +=pod + +=item &parse_row() + +Parse a row returned from the database. + +=cut + +###################################################################### +###################################################################### +sub parse_row { + my @Row = @_; + my %Fields; + if (! scalar(@Datatypes)) { + &set_up_table_structure(); + } + for (my $i=0;$i<=$#Row;$i++) { + $Fields{$Datatypes[$i]->{'name'}}=&Apache::lonnet::unescape($Row[$i]); + } + $Fields{'language'} = + &Apache::loncommon::languagedescription($Fields{'language'}); + $Fields{'copyrighttag'} = + &Apache::loncommon::copyrightdescription($Fields{'copyright'}); + $Fields{'mimetag'} = + &Apache::loncommon::filedescription($Fields{'mime'}); + return \%Fields; +} + +########################################################### +########################################################### + +=pod + +=item &parse_raw_result() + +Takes a line from the file of results and parse it. Returns a hash +with keys according to column labels + +In addition, the following tags are set by calling the appropriate +lonnet function: 'language', 'copyrighttag', 'mimetag'. + +The 'title' field is set to "Untitled" if the title field is blank. + +'abstract' and 'keywords' are truncated to 200 characters. + +=cut + +########################################################### +########################################################### +sub parse_raw_result { + my ($result,$hostname) = @_; + # conclude from self to others regarding fields + my %Fields=&LONCAPA::lonmetadata::metadata_col_to_hash + (map { + &Apache::lonnet::unescape($_); + } (split(/\,/,$result)) ); + return %Fields; +} + +########################################################### +########################################################### + +=pod + +=item &handle_custom_fields() + +=cut + +########################################################### +########################################################### +sub handle_custom_fields { + my @results = @{shift()}; + my $customshow=''; + my $extrashow=''; + my @customfields; + if ($ENV{'form.customshow'}) { + $customshow=$ENV{'form.customshow'}; + $customshow=~s/[^\w\s]//g; + my @fields=map { + "$_:"; + } split(/\s+/,$customshow); + @customfields=split(/\s+/,$customshow); + if ($customshow) { + $extrashow="
  • ".join("
  • ",@fields)."
\n"; + } + } + my $customdata=''; + my %customhash; + foreach my $result (@results) { + if ($result=~/^(custom\=.*)$/) { # grab all custom metadata + my $tmp=$result; + $tmp=~s/^custom\=//; + my ($k,$v)=map {&Apache::lonnet::unescape($_); + } split(/\,/,$tmp); + $customhash{$k}=$v; } + } + return ($extrashow,\@customfields,\%customhash); +} - unless ($compiledresult) { - $compiledresult="There were no results that matched your query"; - } +###################################################################### +###################################################################### - # make query information persistent to allow for subsequent revision - my $persistent=''; - map { - if (/^form\./ && !/submit/) { - my $name=$_; - my $key=$name; - $name=~s/^form\.//; - $persistent.=< -END - } - } (keys %ENV); +=pod - $r->print(< - -The LearningOnline Network with CAPA -BEGINNING - $r->print(< +=item &search_results_header() + +Output the proper html headers and javascript code to deal with different +calling modes. + +Takes most inputs directly from %ENV, except $mode. + +=over 4 + +=item $mode is either (at this writing) 'Basic' or 'Advanced' + +=back + +The following environment variables are checked: + +=over 4 + +=item 'form.catalogmode' + +Checked for 'interactive' and 'groupsearch'. + +=item 'form.mode' + +Checked for existance & 'edit' mode. + +=item 'form.form' + +Contains the name of the form that has the input fields to set + +=item 'form.element' + +the name of the input field to put the URL into + +=item 'form.titleelement' + +the name of the input field to put the title into + +=back + +=cut + +###################################################################### +###################################################################### +sub search_results_header { + my ($importbutton,$closebutton) = @_; + my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1); + my $result = ''; + # output beginning of search page + # conditional output of script functions dependent on the mode in + # which the search was invoked + if ($ENV{'form.catalogmode'} eq 'interactive'){ + if (! exists($ENV{'form.mode'}) || $ENV{'form.mode'} ne 'edit') { + $result.=< function select_data(title,url) { changeTitle(title); changeURL(url); + parent.close(); } function changeTitle(val) { - if (opener.inf.document.forms.resinfo.elements.t) { - opener.inf.document.forms.resinfo.elements.t.value=val; + if (parent.opener.inf.document.forms.resinfo.elements.t) { + parent.opener.inf.document.forms.resinfo.elements.t.value=val; } } function changeURL(val) { - if (opener.inf.document.forms.resinfo.elements.u) { - opener.inf.document.forms.resinfo.elements.u.value=val; + if (parent.opener.inf.document.forms.resinfo.elements.u) { + parent.opener.inf.document.forms.resinfo.elements.u.value=val; } } SCRIPT - $r->print(< +function select_data(title,url) { + changeURL(url); + changeTitle(title); + parent.close(); +} +$changetitle +function changeURL(val) { + if (parent.targetwin.document) { + parent.targetwin.document.forms["$form"].elements["$element"].value=val; + } else { + var url = 'forms[\"$form\"].elements[\"$element\"].value'; + alert("Unable to transfer data to "+url); + } +} + +SCRIPT + } + } + $result.=< +SCRIPT + $result.=< +$bodytag +
+ +$importbutton +END + return $result; +} + +###################################################################### +###################################################################### +sub search_status_header { + my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1); + return <Search Status +$bodytag +

Search Status

+Sending search request to LON-CAPA servers.
+ENDSTATUS +} + +sub results_link { + my $basic_link = "/adm/searchcat?"."&table=".$ENV{'form.table'}. + "&persistent_db_id=".$ENV{'form.persistent_db_id'}; + my $results_link = $basic_link."&phase=results". + "&pause=1"."&start=1"; + return $results_link; +} + +###################################################################### +###################################################################### +sub print_frames_interface { + my $r = shift; + my $basic_link = "/adm/searchcat?"."&table=".$ENV{'form.table'}. + "&persistent_db_id=".$ENV{'form.persistent_db_id'}; + my $run_search_link = $basic_link."&phase=run_search"; + my $results_link = &results_link(); + my $result = <<"ENDFRAMES"; + + + +LON-CAPA Digital Library Search Results - - + + + + + +ENDFRAMES + + $r->print($result); + return; +} + +###################################################################### +###################################################################### + +=pod + +=item Metadata Viewing Functions + +Output is a HTML-ified string. + +Input arguments are title, author, subject, url, keywords, version, +notes, short abstract, mime, language, creation date, +last revision date, owner, copyright, hostname, and +extra custom metadata to show. + +=over 4 + +=item &detailed_citation_view() + +=cut + +###################################################################### +###################################################################### +sub detailed_citation_view { + my ($prefix,%values) = @_; + my $icon=&Apache::loncommon::icon($values{'url'}); + my $result=<$prefix$values{'title'} +

+$values{'author'}, $values{'owner'}
+ +Subject: $values{'subject'}
+Keyword(s): $values{'keywords'}
+Notes: $values{'notes'}
+MIME Type: $values{'mimetag'}
+Language: $values{'language'}
+Copyright/Distribution: $values{'copyrighttag'}
+

+$values{'extrashow'} +

+$values{'shortabstract'} +

+
+END + return $result; +} + +###################################################################### +###################################################################### + +=pod + +=item &summary_view() + +=cut +###################################################################### +###################################################################### +sub summary_view { + my ($prefix,%values) = @_; + my $icon=&Apache::loncommon::icon($values{'url'}); + my $result=<$values{'author'}
+$values{'title'}
+$values{'owner'} -- $values{'lastrevisiondate'}
+$values{'copyrighttag'}
+$values{'extrashow'} +

+
+END + return $result; +} + +###################################################################### +###################################################################### + +=pod + +=item &compact_view() + +=cut + +###################################################################### +###################################################################### +sub compact_view { + my ($prefix,%values) = @_; + my $icon=&Apache::loncommon::icon($values{'url'}); + my $result=< +$values{'title'} +$values{'author'}
+END + return $result; +} + + +###################################################################### +###################################################################### + +=pod + +=item &fielded_format_view() + +=cut + +###################################################################### +###################################################################### +sub fielded_format_view { + my ($prefix,%values) = @_; + my $icon=&Apache::loncommon::icon($values{'url'}); + my $result=< +URL: $values{'url'} +
+Title: $values{'title'}
+Author(s): $values{'author'}
+Subject: $values{'subject'}
+Keyword(s): $values{'keywords'}
+Notes: $values{'notes'}
+MIME Type: $values{'mimetag'}
+Language: $values{'language'}
+Creation Date: $values{'creationdate'}
+Last Revision Date: $values{'lastrevisiondate'}
+Publisher/Owner: $values{'owner'}
+Copyright/Distribution: $values{'copyrighttag'}
+Repository Location: $values{'hostname'}
+Abstract: $values{'shortabstract'}
+$values{'extrashow'} +

+
+END + return $result; +} + +###################################################################### +###################################################################### + +=pod + +=item &xml_sgml_view() + +=back + +=cut + +###################################################################### +###################################################################### +sub xml_sgml_view { + my ($prefix,%values) = @_; + my $result=< +<LonCapaResource> +<url>$values{'url'}</url> +<title>$values{'title'}</title> +<author>$values{'author'}</author> +<subject>$values{'subject'}</subject> +<keywords>$values{'keywords'}</keywords> +<notes>$values{'notes'}</notes> +<mimeInfo> +<mime>$values{'mime'}</mime> +<mimetag>$values{'mimetag'}</mimetag> +</mimeInfo> +<languageInfo> +<language>$values{'language'}</language> +<languagetag>$values{'languagetag'}</languagetag> +</languageInfo> +<creationdate>$values{'creationdate'}</creationdate> +<lastrevisiondate>$values{'lastrevisiondate'}</lastrevisiondate> +<owner>$values{'owner'}</owner> +<copyrightInfo> +<copyright>$values{'copyright'}</copyright> +<copyrighttag>$values{'copyrighttag'}</copyrighttag> +</copyrightInfo> +<repositoryLocation>$values{'hostname'}</repositoryLocation> +<shortabstract>$values{'shortabstract'}</shortabstract> +</LonCapaResource> + +$values{'extrashow'} +
+END + return $result; +} + +###################################################################### +###################################################################### + +=pod + +=item &filled() see if field is filled. + +=cut + +###################################################################### +###################################################################### +sub filled { + my ($field)=@_; + if ($field=~/\S/ && $field ne 'any') { + return 1; + } else { + return 0; + } +} + +###################################################################### +###################################################################### + +=pod + +=item &output_blank_field_error() + +Output a complete page that indicates the user has not filled in enough +information to do a search. + +Inputs: $r (Apache request handle), $closebutton, $parms. + +Returns: nothing + +$parms is extra information to include in the 'Revise search request' link. + +=cut + +###################################################################### +###################################################################### +sub output_blank_field_error { + my ($r,$closebutton,$parms,$hidden_fields)=@_; + my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1); + # make query information persistent to allow for subsequent revision + $r->print(< + +The LearningOnline Network with CAPA +BEGINNING + $r->print(< +$bodytag +

Search Catalog

+$hidden_fields +Revise search request  +$closebutton +
+

Unactionable search query.

+

+You did not fill in enough information for the search to be started. +You need to fill in relevant fields on the search page in order +for a query to be processed. +

+ + +RESULTS +} + +###################################################################### +###################################################################### + +=pod + +=item &output_date_error() + +Output a full html page with an error message. + +Inputs: + + $r, the request pointer. + $message, the error message for the user. + $closebutton, the specialized close button needed for groupsearch. + +=cut + +###################################################################### +###################################################################### +sub output_date_error { + my ($r,$message,$closebutton,$hidden_fields)=@_; + # make query information persistent to allow for subsequent revision + my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1); + $r->print(< + +The LearningOnline Network with CAPA + +$bodytag + +

Search Catalog

+ +$hidden_fields - -$persistent -
-

Search Query

+onClick='this.form.submit();' /> +$closebutton +
+

Error

-Basic search: $ENV{'form.basicexp'} +$message

-

Search Results

-$compiledresult RESULTS +} + +###################################################################### +###################################################################### + +=pod + +=item &start_fresh_session() + +Cleans the global %groupsearch_db by removing all fields which begin with +'pre_' or 'store'. + +=cut + +###################################################################### +###################################################################### +sub start_fresh_session { + delete $groupsearch_db{'mode_catalog'}; + foreach (keys %groupsearch_db) { + if ($_ =~ /^pre_/) { + delete $groupsearch_db{$_}; + } + if ($_ =~ /^store/) { + delete $groupsearch_db{$_}; + } } } 1; + +sub cleanup { + if (tied(%groupsearch_db)) { + unless (untie(%groupsearch_db)) { + &Apache::lonnet::logthis('Failed cleanup searchcat: groupsearch_db'); + } + } + &untiehash(); + &Apache::lonmysql::disconnect_from_db(); +} + __END__ + +=pod + +=back + +=cut