--- loncom/interface/lonsearchcat.pm 2001/03/08 13:32:04 1.2 +++ loncom/interface/lonsearchcat.pm 2002/05/22 16:21:50 1.119 @@ -1,64 +1,1685 @@ -# The LearningOnline Network +# The LearningOnline Network with CAPA # Search Catalog # -# 03/08/2001 Scott Harrison +# $Id: lonsearchcat.pm,v 1.119 2002/05/22 16:21:50 www 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/ +# +# YEAR=2001 +# 3/8, 3/12, 3/13, 3/14, 3/15, 3/19 Scott Harrison +# 3/20, 3/21, 3/22, 3/26, 3/27, 4/2, 8/15, 8/24, 8/25 Scott Harrison +# 10/12,10/14,10/15,10/16,11/28,11/29,12/10,12/12,12/16 Scott Harrison +# YEAR=2002 +# 1/17 Scott Harrison +# +### + +############################################################################### +## ## +## ORGANIZATION OF THIS PERL MODULE ## +## ## +## 1. Modules used by this module ## +## 2. Choices for different output views (detailed, summary, xml, etc) ## +## 3. BEGIN block (to be run once after compilation) ## +## 4. Handling routine called via Apache and mod_perl ## +## 5. Other subroutines ## +## ## +############################################################################### + package Apache::lonsearchcat; +# ------------------------------------------------- modules used by this module use strict; use Apache::Constants qw(:common); +use Apache::lonnet(); +use Apache::File(); +use CGI qw(:standard); +use Text::Query; +use GDBM_File; +use Apache::loncommon(); + +# ---------------------------------------- variables used throughout the module + +# -- information holders +my %hostdomains; # matches host name to host domain +my %hostips; # matches host name to host ip +my %hitcount; # stores number of hits per host + +# -- dynamically rendered interface components +my $closebutton; # button that closes the search window +my $importbutton; # button to take the selected results and go to group sorting +my $hidden; + +# -- miscellaneous variables +my $scrout; # string that holds portions of the screen output +my $yourself; # allows for quickly limiting to oneself +my %hash; +# ------------------------------------------ choices for different output views +# Detailed Citation View ---> sub detailed_citation_view +# Summary View ---> sub summary_view +# Fielded Format ---> sub fielded_format_view +# XML/SGML ---> sub xml_sgml_view +my $basicviewselect=< + + + + + +END +my $advancedviewselect=< + + + + + +END + +# ----------------------------------------------------------------------- BEGIN +BEGIN { + { + my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}. + '/hosts.tab'); + while (<$fh>) { + $_=~/(\w+?)\:(\w+?)\:(\w+?)\:(.*)/; chomp; + if ($3 eq 'library') { + $hostdomains{$1}=$2; + $hostips{$1}=$4; + } + } + } +} + +#------------------------------------------------------------- global variables +my $diropendb = ""; +my $domain = ""; + +# ----------------------------- Handling routine called via Apache and mod_perl sub handler { my $r = shift; + untie %hash; + $r->content_type('text/html'); $r->send_http_header; return OK if $r->header_only; + $domain = $r->dir_config('lonDefDomain'); + $diropendb= "/home/httpd/perl/tmp/$domain\_$ENV{'user.name'}_searchcat.db"; + + &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'}, + ['catalogmode','launch','acts','mode','form','element']); + + if ($ENV{'form.launch'} eq '1') { + if (tie(%hash,'GDBM_File',$diropendb,&GDBM_WRCREAT,0640)) { + &start_fresh_session(); + untie %hash; + } + else { + $r->print('Unable to tie hash to db '. + 'file'); + return OK; + } + } + +# --------------------------- Produce some output, so people know it is working + + $r->print("\n"); + $r->rflush; + +# ----------------------------------- configure dynamic components of interface + + if ($ENV{'form.catalogmode'} eq 'interactive') { + $hidden="". + "\n"; + $closebutton=""."\n"; + } + elsif ($ENV{'form.catalogmode'} eq 'groupsearch') { + $hidden=< +END + $closebutton=< +END + $importbutton=< +END + } + $hidden .= < + + + +END +# ------------------------------------------------------ Determine current user + $yourself=$ENV{'user.name'}.'@'.$ENV{'user.domain'}; + +# --- Now, depending on the interface actions, do one of three things here: +# --- 1. a basic search +# --- 2. an advanced search +# --- 3. output a search interface + +# ----------------------------------- See if a search invocation should be done + if ($ENV{'form.basicsubmit'} eq 'SEARCH') { + untie %hash; return &basicsearch($r,\%ENV); + } + elsif ($ENV{'form.advancedsubmit'} eq 'SEARCH') { + untie %hash; return &advancedsearch($r,\%ENV); + } + +# ----------------------------- Else, begin building search interface to output + $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'}); + + $scrout.=&searchphrasefield('Limit by subject','subject', + $ENV{'form.subject'}); + + $scrout.=&searchphrasefield('Limit by keywords','keywords', + $ENV{'form.keywords'}); + + $scrout.=&searchphrasefield('Limit by URL','url', + $ENV{'form.url'}); + +# $scrout.=&searchphrasefield('Limit by version','version', +# $ENV{'form.version'}); + + $scrout.=&searchphrasefield('Limit by notes','notes', + $ENV{'form.notes'}); + + $scrout.=&searchphrasefield('Limit by abstract','abstract', + $ENV{'form.abstract'}); + + $ENV{'form.mime'}='any' unless length($ENV{'form.mime'}); + $scrout.=&selectbox('Limit by MIME type','mime', + $ENV{'form.mime'}, + 'any','Any type', + \&{Apache::loncommon::filedescriptionex}, + (&Apache::loncommon::fileextensions)); + + $ENV{'form.language'}='any' unless length($ENV{'form.language'}); + + $scrout.=&selectbox('Limit by language','language', + $ENV{'form.language'},'any','Any Language', + \&{Apache::loncommon::languagedescription}, + (&Apache::loncommon::languageids), + ); + +# ------------------------------------------------ Compute date selection boxes + $scrout.=< +LIMIT BY CREATION DATE RANGE: + +
+between: +CREATIONDATESTART + $scrout.=&dateboxes('creationdatestart',1,1,1976, + $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'}, + ); + $scrout.=< +LIMIT BY SPECIAL METADATA FIELDS: + +For resource-specific metadata, enter in an expression in the form of +key=value separated by operators such as AND, OR or NOT.
+Example: grandmother=75 OR grandfather=85 +
+CUSTOMMETADATA +$scrout.=&simpletextfield('custommetadata',$ENV{'form.custommetadata'}); +$scrout.=' initial users of this system do not need to worry about this option'; + + $scrout.=< +SHOW SPECIAL METADATA FIELDS: + +Enter in a space-separated list of special metadata fields to show +in a fielded listing for each record result. +
+CUSTOMSHOW +$scrout.=&simpletextfield('customshow',$ENV{'form.customshow'}); +$scrout.=' initial users of this system do not need to worry about this option'; + # ---------------------------------------------------------------- Print screen $r->print(< The LearningOnline Network with CAPA + +

Search Catalog

-
- - - - -
Resource Library Search
- - - - - - - - - - - - - - - - - - - - - - - - -
title
author
subject
notes
abstract
mime
language
creationdate
lastrevisiondate
owner
copyright
+ +$hidden +
+

Basic Search

+

+Enter terms or phrases separated by search operators +such as AND, OR, or NOT 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'})); +# Search historic archives + $r->print(< + + +$closebutton +$basicviewselect + +

+
+

Advanced Search

+$scrout +

+ + +$closebutton +$advancedviewselect + +

+
ENDDOCUMENT return OK; } +# ------------------------------------------------------------- make persistent +sub make_persistent { + my $persistent=''; + + foreach (keys %ENV) { + if (/^form\./ && !/submit/) { + my $name=$_; + my $key=$name; + $ENV{$key}=~s/\'//g; # do not mess with html field syntax + $name=~s/^form\.//; + $persistent.=< +END + } + } + return $persistent; +} + +# --------------------------------------------------------- Various form fields + +sub simpletextfield { + my ($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)=('','',''); + # + # Day + my $day=< + +END + for (my $i = 1; $i<=31; $i++) { + $day.="\n"; + } + $day.="\n"; + $day=~s/(\"$currentday\")/$1 SELECTED/ if length($currentday); + # + # Month + my $month=< + +END + my $i = 1; + foreach (qw/January February March April May June + July August September October November December /){ + $month .="\n"; + $i++; + } + $month.="\n"; + $month=~s/(\"$currentmonth\")/$1 SELECTED/ if length($currentmonth); + # + # Year (obviously) + my $year=< + +END + my $maxyear = 2051; + for (my $i = 1976; $i<=$maxyear; $i++) { + $year.="\n"; + } + $year.="\n"; + $year=~s/(\"$currentyear\")/$1 SELECTED/ if length($currentyear); + return "$month$day$year"; +} + +sub selectbox { + my ($title,$name,$value,$anyvalue,$anytag,$functionref,@idlist)=@_; + my $uctitle=uc($title); + my $selout="\n

$uctitle:". + "
".''; +} + +# ----------------------------------------------- Performing an advanced search +sub advancedsearch { + my ($r,$envhash)=@_; + my %ENV=%{$envhash}; + + my $fillflag=0; + # 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','mime','language','owner', + 'custommetadata','customshow') { + $ENV{"form.$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; + } + # Check to see if enough information was filled in + for my $field ('title','author','subject','keywords','url','version', + 'notes','abstract','mime','language','owner', + 'custommetadata') { + if (&filled($ENV{"form.$field"})) { + $fillflag++; + } + } + unless ($fillflag) { + &output_blank_field_error($r); + return OK; + } + + + # Turn the form input into a SQL-based query + my $query=''; + + my @queries; + # Evaluate logical expression AND/OR/NOT phrase fields. + foreach my $field ('title','author','subject','notes','abstract','url', + 'keywords','version','owner') { + if ($ENV{'form.'.$field}) { + push @queries,&build_SQL_query($field,$ENV{'form.'.$field}); + } + } + # Evaluate option lists + if ($ENV{'form.language'} and $ENV{'form.language'} ne 'any') { + push @queries,"(language like \"$ENV{'form.language'}\")"; + } + if ($ENV{'form.mime'} and $ENV{'form.mime'} ne 'any') { + push @queries,"(mime like \"$ENV{'form.mime'}\")"; + } + if ($ENV{'form.copyright'} and $ENV{'form.copyright'} ne 'any') { + push @queries,"(copyright like \"$ENV{'form.copyright'}\")"; + } + # Evaluate date windows + my $datequery=&build_date_queries( + $ENV{'form.creationdatestart_month'}, + $ENV{'form.creationdatestart_day'}, + $ENV{'form.creationdatestart_year'}, + $ENV{'form.creationdateend_month'}, + $ENV{'form.creationdateend_day'}, + $ENV{'form.creationdateend_year'}, + $ENV{'form.lastrevisiondatestart_month'}, + $ENV{'form.lastrevisiondatestart_day'}, + $ENV{'form.lastrevisiondatestart_year'}, + $ENV{'form.lastrevisiondateend_month'}, + $ENV{'form.lastrevisiondateend_day'}, + $ENV{'form.lastrevisiondateend_year'}, + ); + # Test to see if date windows are legitimate + if ($datequery=~/^Incorrect/) { + &output_date_error($r,$datequery); + return OK; + } + elsif ($datequery) { + push @queries,$datequery; + } + + # Process form information for custom metadata querying + my $customquery=''; + if ($ENV{'form.custommetadata'}) { + $customquery=&build_custommetadata_query('custommetadata', + $ENV{'form.custommetadata'}); + } + my $customshow=''; + if ($ENV{'form.customshow'}) { + $customshow=$ENV{'form.customshow'}; + $customshow=~s/[^\w\s]//g; + my @fields=split(/\s+/,$customshow); + $customshow=join(" ",@fields); + } + # Send query statements over the network to be processed by either the SQL + # database or a recursive scheme of 'grep'-like actions (for custom + # metadata). + if (@queries) { + $query=join(" AND ",@queries); + $query="select * from metadata where $query"; + my $reply; # reply hash reference + unless ($customquery or $customshow) { + $reply=&Apache::lonnet::metadata_query($query); + } + else { + $reply=&Apache::lonnet::metadata_query($query, + $customquery,$customshow); + } + &output_results('Advanced',$r,$envhash,$customquery,$reply); + } + elsif ($customquery) { + my $reply; # reply hash reference + $reply=&Apache::lonnet::metadata_query('', + $customquery,$customshow); + &output_results('Advanced',$r,$envhash,$customquery,$reply); + } + # should not get to this point + return 'Error. Should not have gone to this point.'; +} + +# --------------------------------------------------- Performing a basic search +sub basicsearch { + my ($r,$envhash)=@_; + my %ENV=%{$envhash}; + # 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; + } + + # Check to see if enough is filled in + unless (&filled($ENV{'form.basicexp'})) { + &output_blank_field_error($r); + return OK; + } + + # Build SQL query string based on form page + my $query=''; + my $concatarg=join('," ",', + ('title', 'author', 'subject', 'notes', 'abstract')); + $concatarg='title' if $ENV{'form.titleonly'}; + + $query=&build_SQL_query('concat('.$concatarg.')',$ENV{'form.'.'basicexp'}); + + # Get reply (either a hash reference to filehandles or bad connection) + my $reply=&Apache::lonnet::metadata_query('select * from metadata where '.$query); + + # Output search results + + &output_results('Basic',$r,$envhash,$query,$reply); + + return OK; +} + +# ------------------------------------------------------------- build_SQL_query +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 $sql_query; +} + +# ------------------------------------------------- build custom metadata query +sub build_custommetadata_query { + my ($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 + my $oldmatchexp=$matchexp; + $matchexp=~s/(\w+)\\\=([\w\\\+]+)/\\\<$1\\\>\[\^\\\<\]\*$2\[\^\\\<\]\*\\\<\\\/$1\\\>/g; + return $matchexp; +} + +# - Recursively parse a reverse notation expression into a SQL query expression +sub recursive_SQL_query_build { + my ($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 \"\%$value\%\")"; + } + elsif ($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,$pattern); +} + +# ------------------------------------------------------------ Build date query +sub build_date_queries { + my ($cmonth1,$cday1,$cyear1,$cmonth2,$cday2,$cyear2, + $lmonth1,$lday1,$lyear1,$lmonth2,$lday2,$lyear2)=@_; + my @queries; + if ($cmonth1 or $cday1 or $cyear1 or $cmonth2 or $cday2 or $cyear2) { + unless ($cmonth1 and $cday1 and $cyear1 and + $cmonth2 and $cday2 and $cyear2) { + return "Incorrect entry for the creation date. You must specify ". + "a starting month, day, and year and an ending month, ". + "day, and year."; + } + my $cnumeric1=sprintf("%d%2d%2d",$cyear1,$cmonth1,$cday1); + $cnumeric1+=0; + my $cnumeric2=sprintf("%d%2d%2d",$cyear2,$cmonth2,$cday2); + $cnumeric2+=0; + if ($cnumeric1>$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 ''; +} + +# ----------------------------- format and output results based on a reply list +# There are two windows that this function writes to. The main search +# window ("srch") has a listing of the results. A secondary window ("popwin") +# gives the status of the network search (time elapsed, number of machines +# contacted, etc.) +sub output_results { + my $fnum; # search result counter + my ($mode,$r,$envhash,$query,$replyref)=@_; + my %ENV=%{$envhash}; + my %rhash=%{$replyref}; + my $compiledresult=''; + my $timeremain=300; + my $elapsetime=0; + my $resultflag=0; + my $tflag=1; + + # make query information persistent to allow for subsequent revision + my $persistent=&make_persistent(); + + # output beginning of search page + $r->print(< + +The LearningOnline Network with CAPA +BEGINNING + + # conditional output of script functions dependent on the mode in + # which the search was invoked + if ($ENV{'form.catalogmode'} eq 'interactive'){ + if (! exists($ENV{'form.mode'}) || $ENV{'form.mode'} ne 'edit') { + $r->print(< + function select_data(title,url) { + changeTitle(title); + changeURL(url); + self.close(); + } + function changeTitle(val) { + if (opener.inf.document.forms.resinfo.elements.t) { + opener.inf.document.forms.resinfo.elements.t.value=val; + } + } + function changeURL(val) { + if (opener.inf.document.forms.resinfo.elements.u) { + opener.inf.document.forms.resinfo.elements.u.value=val; + } + } + +SCRIPT + } elsif ($ENV{'form.mode'} eq 'edit') { + my $form = $ENV{'form.form'}; + my $element = $ENV{'form.element'}; + $r->print(< +function select_data(title,url) { + changeURL(url); + self.close(); +} +function changeTitle(val) { +} +function changeURL(val) { + if (window.opener.document) { + window.opener.document.forms["$form"].elements["$element"].value=val; + } else { + var url = 'forms[\"$form\"].elements[\"$element\"].value'; + alert("Unable to transfer data to "+url); + } +} + +SCRIPT + } + } + $r->print(< + function select_data(title,url) { +// alert('DEBUG: Should be storing '+title+' and '+url); + } + function queue(val) { + if (eval("document.forms.results.returnvalues["+val+"].checked")) { + document.forms.results.acts.value+='1a'+val+'b'; + } + else { + document.forms.results.acts.value+='0a'+val+'b'; + } + } + function select_group() { + window.location= + "/adm/groupsort?mode=$ENV{'form.mode'}&catalogmode=groupsearch&acts="+ + document.forms.results.acts.value; + } + +SCRIPT + $r->print(< + function displayinfo(val) { + popwin.document.forms.popremain.sdetails.value=val; + } + function openhelp(val) { + openhelpwin=open('/adm/help/searchcat.html','helpscreen', + 'scrollbars=1,width=400,height=300'); + openhelpwin.focus(); + } + function abortsearch(val) { + popwin.close(); + } + +SCRIPT + $r->rflush(); + + # begin showing the cataloged results + $r->print(< + + +

Search Catalog

+CATALOGBEGIN + $r->print(< +$hidden + + +$importbutton +$closebutton +$persistent +
+

Search Query

+CATALOGCONTROLS + if ($mode eq 'Basic') { + $r->print(< +Basic search: $ENV{'form.basicexp'} +

+RESULTS + } + elsif ($mode eq 'Advanced') { + $r->print(< +Advanced search +$query +

+RESULTS + } + $r->print('

Search Results

'); + $r->rflush(); + my $servernum=(keys %rhash)+0; + + # define server grid (shows status of multiple machines) + my $hcinit; + my $grid="'
'+"; + $grid.="\n"; + my $sn=1; + for my $sk (sort keys %rhash) { + # ''+ + $grid.="'+\"'\"+')\">'+"; + $grid.="\n"; + $grid.="'\"".$sk."\"'+\n"; + $grid.="'
'+\n" unless $sn%10; + $sn++; + } + $r->print(< + popwin=open('','popwin','scrollbars=1,width=400,height=220'); + popwin.focus(); + popwin.document.writeln('<'+'html>'); + popwin.document.writeln('<'+'head>'); + popwin.document.writeln('<'+'script>'); + popwin.document.writeln('hc=new Array();$hcinit'); + popwin.document.writeln('<'+'/script>'); + popwin.document.writeln('<'+'/head>'+ + '<'+'body bgcolor="#FFFFFF">'+ + '<'+'image name="whirly" align="right" src="/adm/lonIcons/'+ + 'lonanim.gif" '+ + 'alt="animated logo" />'+ + '<'+'h3>Search Results Progress<'+'/h3>'+ + '<'+'form name="popremain">'+ + '<'+'tt>'+ + '<'+'br clear="all"/>PLEASE BE PATIENT'+ + '<'+'br />SCANNING $servernum SERVERS'+ + '<'+'br clear="all" />Number of record hits found '+ + '<'+'input type="text" size="10" name="numhits"'+ + ' value="0" />'+ + '<'+'br clear="all" />Time elapsed '+ + '<'+'input type="text" size="10" name="elapsetime"'+ + ' value="0" />'+ + '<'+'br />'+ + 'SERVER GRID (click on any cell for details)'+ + $grid + '<'+'br />'+ + 'Server details '+ + '<'+'input type="text" size="35" name="sdetails"'+ + ' value="" />'+ + '<'+'br />'+ + ' <'+'input type="button" name="button"'+ + ' value="close this window" '+ + ' onClick="javascript:opener.abortsearch()" />'+ + ' <'+'input type="button" name="button"'+ + ' value="help" onClick="javascript:opener.openhelp()" />'+ + '<'+'/tt>'+ + '<'+'/form>'+ + '<'+'/body><'+'/html>'); + popwin.document.close(); + +ENDPOP + $r->rflush(); + + my $servercount=0; + my $hitcountsum=0; + my $bloop=$servernum; + my %orkey; + BLOOP: while(1) { + my $sn=0; + last BLOOP unless $bloop; + last BLOOP unless $timeremain; + RLOOP: foreach my $rkey (sort keys %rhash) { + $sn++; + next RLOOP if $orkey{$rkey}; + $servercount++; + $tflag=1; + $compiledresult=''; + my $hostname=$rkey; + my $reply=$rhash{$rkey}; + my @results; + + my $replyfile=''; + + if ($reply eq 'con_lost') { + &popwin_imgupdate($r,$sn,"srvbad.gif"); + $bloop--; + $orkey{$rkey}=1; + } + else { + $reply=~/^([\.\w]+)$/; # must do since 'use strict' checks for tainting + $replyfile=$r->dir_config('lonDaemons').'/tmp/'.$1; + $reply=~/(.*?)\_/; + { + my $temp=0; + WLOOP: while (1) { + if (-e $replyfile && $tflag) { + &popwin_imgupdate($r,$sn,"srvhalf.gif"); + &popwin_js($r,'popwin.hc["'.$rkey.'"]='. + '"still transferring..."'.';'); + $tflag=0; + } + if (-e "$replyfile.end") { + $bloop--; + $orkey{$rkey}=1; + if (-s $replyfile) { + &popwin_imgupdate($r,$sn,"srvgood.gif"); + my $fh=Apache::File->new($replyfile) or + ($r->print('ERROR: file '. + $replyfile.' cannot be opened') and + return OK); + @results=<$fh> if $fh; + $hitcount{$rkey}=@results+0; + &popwin_js($r,'popwin.hc["'.$rkey.'"]='. + $hitcount{$rkey}.';'); + $hitcountsum+=$hitcount{$rkey}; + &popwin_js($r,'popwin.document.forms.popremain.'. + 'numhits.value='.$hitcountsum.';'); + } + else { + &popwin_imgupdate($r,$sn,"srvempty.gif"); + &popwin_js($r,'popwin.hc["'.$rkey.'"]=0;'); + } + last WLOOP; + } + if ($temp>1) { + sleep 1; + $timeremain--; + $elapsetime++; + last WLOOP; + } + last WLOOP unless $timeremain; + sleep 1; + $timeremain--; + $elapsetime++; + &popwin_js($r,"popwin.document.popremain.". + "elapsetime.value=$elapsetime;"); + $temp++; + } + } + &popwin_js($r,'popwin.document.whirly.'. + 'src="/adm/lonIcons/lonanimend.gif";'); + } + 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}=$v; + } + } + if (keys %hash) { + untie %hash; + } + if (tie(%hash,'GDBM_File',$diropendb,&GDBM_WRCREAT,0640)) { + if ($ENV{'form.launch'} eq '1') { + &start_fresh_session(); + } + foreach my $result (@results) { + next if $result=~/^custom\=/; + chomp $result; + next unless $result; + my @fields=map + {&Apache::lonnet::unescape($_)} + (split(/\,/,$result)); + my ($title,$author,$subject,$url,$keywords,$version, + $notes,$abstract,$mime,$lang, + $creationdate,$lastrevisiondate,$owner,$copyright)=@fields; + + unless ($title) { $title='Untitled'; } + unless ($ENV{'user.adv'}) { + $keywords='- not displayed -'; + $fields[4]=$keywords; + $notes='- not displayed -'; + $fields[6]=$notes; + $abstract='- not displayed -'; + $fields[7]=$abstract; + $subject='- not displayed -'; + $fields[2]=$subject; + } + + my $shortabstract=$abstract; + $shortabstract=substr($abstract,0,200).'...' if length($abstract)>200; + $fields[7]=$shortabstract; + my $shortkeywords=$keywords; + $shortkeywords=substr($keywords,0,200).'...' if length($keywords)>200; + $fields[4]=$shortkeywords; + + my $extrashow2=$extrashow; + if ($extrashow) { + foreach my $field (@customfields) { + my $value=''; + if ($customhash{$url}=~/\<${field}[^\>]*\>(.*?)\<\/${field}[^\>]*\>/s) { + $value=$1; + } + $extrashow2=~s/\<\!\-\- $field \-\-\>/ $value/g; + } + } + + $compiledresult.=< +END + $compiledresult.=< +END + if ($ENV{'form.catalogmode'} eq 'interactive') { + my $titleesc=$title; + $titleesc=~s/\'/\\'/; # ' + + $compiledresult.=< + +
+END + } + if ($ENV{'form.catalogmode'} eq 'groupsearch') { + $fnum+=0; + $hash{"pre_${fnum}_link"}=$url; + $hash{"pre_${fnum}_title"}=$title; + $compiledresult.=< + + +
+END +# +# + $fnum++; + } + my $httphost=$ENV{'HTTP_HOST'}; + + my $viewselect; + if ($mode eq 'Basic') { + $viewselect=$ENV{'form.basicviewselect'}; + } + elsif ($mode eq 'Advanced') { + $viewselect=$ENV{'form.advancedviewselect'}; + } + + if ($viewselect eq 'Detailed Citation View') { + $compiledresult.=&detailed_citation_view(@fields, + $hostname,$httphost, + $extrashow2); + } + elsif ($viewselect eq 'Summary View') { + $compiledresult.=&summary_view(@fields,$hostname,$httphost, + $extrashow2); + } + elsif ($viewselect eq 'Fielded Format') { + $compiledresult.=&fielded_format_view(@fields,$hostname, + $httphost,$extrashow2); + } + elsif ($viewselect eq 'XML/SGML') { + $compiledresult.=&xml_sgml_view(@fields,$hostname,$httphost, + $extrashow2); + } + + } + + untie %hash; + } + else { + $r->print('Unable to tie hash to db '. + 'file'); + } + if ($compiledresult) { + $resultflag=1; + } + + $r->print(<print("\nThere were no results that matched your query\n"); + } +# $r->print(''."\n"); $r->rflush(); + $r->print(< + +RESULTS +} + +# ------------------------------------------------------ Detailed Citation View +sub detailed_citation_view { + my ($title,$author,$subject,$url,$keywords,$version, + $notes,$shortabstract,$mime,$lang, + $creationdate,$lastrevisiondate,$owner,$copyright, + $hostname,$httphost,$extrashow)=@_; + my $result=<$owner, last revised $lastrevisiondate +

$title

+

$author

+

+

+Subject: $subject
+Keyword(s): $keywords
+Notes: $notes
+MIME Type: +END + $result.=&Apache::loncommon::filedescription($mime); + $result.=< +Language: +END + $result.=&Apache::loncommon::languagedescription($lang); + $result.=< +Copyright/Distribution: +END + $result.=&Apache::loncommon::copyrightdescription($copyright); + $result.=< +

+$extrashow +

+$shortabstract +

+END + return $result; +} + +# ---------------------------------------------------------------- Summary View +sub summary_view { + my ($title,$author,$subject,$url,$keywords,$version, + $notes,$shortabstract,$mime,$lang, + $creationdate,$lastrevisiondate,$owner,$copyright, + $hostname,$httphost,$extrashow)=@_; + my $cprtag=&Apache::loncommon::copyrightdescription($copyright); + my $result=<$author
+$title
+$owner -- $lastrevisiondate
+$cprtag
+$extrashow +

+END + return $result; +} + +# -------------------------------------------------------------- Fielded Format +sub fielded_format_view { + my ($title,$author,$subject,$url,$keywords,$version, + $notes,$shortabstract,$mime,$lang, + $creationdate,$lastrevisiondate,$owner,$copyright, + $hostname,$httphost,$extrashow)=@_; + my $mimetag=&Apache::loncommon::filedescription($mime); + my $language=&Apache::loncommon::languagedescription($lang); + my $cprtag=&Apache::loncommon::copyrightdescription($copyright); + my $result=<URL: $url +
+Title: $title
+Author(s): $author
+Subject: $subject
+Keyword(s): $keywords
+Notes: $notes
+MIME Type: $mimetag
+Language: $language
+Creation Date: $creationdate
+Last Revision Date: $lastrevisiondate
+Publisher/Owner: $owner
+Copyright/Distribution: $cprtag
+Repository Location: $hostname
+Abstract: $shortabstract
+$extrashow +

+END + return $result; +} + +# -------------------------------------------------------------------- XML/SGML +sub xml_sgml_view { + my ($title,$author,$subject,$url,$keywords,$version, + $notes,$shortabstract,$mime,$lang, + $creationdate,$lastrevisiondate,$owner,$copyright, + $hostname,$httphost,$extrashow)=@_; + my $cprtag=&Apache::loncommon::copyrightdescription($copyright); + my $mimetag=&Apache::loncommon::filedescription($mime); + my $language=&Apache::loncommon::languagedescription($lang); + my $result=< +<LonCapaResource> +<url>$url</url> +<title>$title</title> +<author>$author</author> +<subject>$subject</subject> +<keywords>$keywords</keywords> +<notes>$notes</notes> +<mimeInfo> +<mime>$mime</mime> +<mimetag>$mimetag</mimetag> +</mimeInfo> +<languageInfo> +<language>$lang</language> +<languagetag>$language</languagetag> +</languageInfo> +<creationdate>$creationdate</creationdate> +<lastrevisiondate>$lastrevisiondate</lastrevisiondate> +<owner>$owner</owner> +<copyrightInfo> +<copyright>$copyright</copyright> +<copyrighttag>$cprtag</copyrighttag> +</copyrightInfo> +<repositoryLocation>$hostname</repositoryLocation> +<shortabstract>$shortabstract</shortabstract> +</LonCapaResource> + +$extrashow +END + return $result; +} + +# ---------------------------------------------------- see if a field is filled +sub filled { + my ($field)=@_; + if ($field=~/\S/ && $field ne 'any') { + return 1; + } + else { + return 0; + } +} + +# ---------------- Message to output when there are not enough fields filled in +sub output_blank_field_error { + my ($r)=@_; + # make query information persistent to allow for subsequent revision + my $persistent=&make_persistent(); + + $r->print(< + +The LearningOnline Network with CAPA +BEGINNING + $r->print(< + + +

Search Catalog

+
+$persistent + +$closebutton +
+

Helpful Message

+

+Incorrect search query due to blank entry fields. +You need to fill in the relevant +fields on the search page in order for a query to be +processed. +

+ + +RESULTS +} + +# ----------------------------------------------------------- Output date error +sub output_date_error { + my ($r,$message)=@_; + # make query information persistent to allow for subsequent revision + my $persistent=&make_persistent(); + + $r->print(< + +The LearningOnline Network with CAPA +BEGINNING + $r->print(< + + +

Search Catalog

+ +$persistent + +$closebutton +
+

Helpful Message

+

+$message +

+ + +RESULTS +} + +# --------- settings whenever the user causes the search window to be launched +sub start_fresh_session { + delete $hash{'mode_catalog'}; + foreach (keys %hash) { + if ($_ =~ /^pre_/) { + delete $hash{$_}; + } + if ($_ =~ /^store/) { + delete $hash{$_}; + } + } +} + +# ----------------------------------------------- send javascript to popwin +sub popwin_js { + # Print javascript out to popwin, but make sure we dont generate + # any javascript errors in doing so. + my ($r,$text) = @_; + $r->print(<<"END"); + +END + $r->rflush(); +} + +sub popwin_imgupdate { + my ($r,$imgnum,$icon) = @_; + &popwin_js($r,'popwin.document.img'.$imgnum.'.'. + 'src="/adm/lonIcons/'.$icon.'";'); +} + 1; + __END__ + +=head1 NAME + +Apache::lonsearchcat - mod_perl module for handling a searchable catalog + +=head1 SYNOPSIS + +Invoked by /etc/httpd/conf/srm.conf: + + + PerlAccessHandler Apache::lonacc + SetHandler perl-script + PerlHandler Apache::lonsearchcat + ErrorDocument 403 /adm/login + ErrorDocument 500 /adm/errorhandler + + +=head1 INTRODUCTION + +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. + +=head1 BEGIN SUBROUTINE + +This routine is only run once after compilation. + +=over 4 + +=item * + +Initializes %hostdomains and hostips hash table (for hosts.tab). + +=back + +=head1 HANDLER SUBROUTINE + +This routine is called by Apache and mod_perl. + +=over 4 + +=item * + +configure dynamic components of interface + +=item * + +determine current user + +=item * + +see if a search invocation should be done + +=item * + +else, begin building search interface to output + +=item * + +compute date selection boxes + +=item * + +compute customized metadata field + +=item * + +print screen + +=back + +=head1 OTHER SUBROUTINES + +=over 4 + +=item * + +get_unprocessed_cgi() : reads in critical name/value pairs that may have not +been processed and passed into %ENV by the web server + +=item * + +make_persistent() : makes a set of hidden HTML fields to make +SQL search interface information to be persistent + +=back + +WEB INTERFACE COMPONENT FUNCTIONS + +=over 4 + +=item * + +simpletextfield(name,value) : returns HTML formatted string for simple text +field + +=item * + +simplecheckbox(name,value) : returns HTML formatted string for simple +checkbox + +=item * + +searchphrasefield(title,name,value) : returns HTML formatted string for +a search expression phrase field + +=item * + +dateboxes(name, defaultmonth, defaultday, defaultyear) : returns HTML +formatted string for a calendar date + +=item * + +selectbox(title,name,value,%HASH=options) : returns HTML formatted string for +a selection box field + +=back + +SEARCH FUNCTIONS + +=over 4 + +=item * + +advancedsearch(server reference, environment reference) : perform a complex +multi-field logical query + +=item * + +basicsearch(server reference, environment reference) : perform a simple +single-field logical query + +=item * + +build_SQL_query(field name, logic) : builds a SQL query string from a +logical expression with AND/OR keywords + +=item * + +build_custommetadata_query(field_name, logic_statement) : builds a perl +regular expression from a logical expression with AND/OR keywords + +=item * + +recursive_SQL_query_build(field name, reverse notation expression) : +builds a SQL query string from a reverse notation expression +logical expression with AND/OR keywords + +=item * + +build_date_queries(cmonth1, cday1, cyear1, cmonth2, cday2, cyear2, +lmonth1, lday1, lyear1, lmonth2, lday2, lyear2) : +Builds a SQL logic query to check time/date entries. + +=back + +OUTPUTTING RESULTS FUNCTION + +=over 4 + +=item * + +output_results(output mode, server reference, environment reference, +reply list reference) : outputs results from search + +=back + +DIFFERENT WAYS TO VIEW METADATA RECORDS + +=over 4 + +=item * + +detailed_citation_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) : +see metadata viewing notes below + +=item * + +summary_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) : +see metadata viewing notes below + +=item * + +fielded_format_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) : +see metadata viewing notes below + +=item * + +xml_sgml_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) : +see metadata viewing notes below + +=back + + _____________________________________________________________________ + | * Metadata viewing notes | + | 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, httphost, and | + | extra custom metadata to show. | + --------------------------------------------------------------------- + +TEST CONDITIONAL FUNCTIONS + +=over 4 + +=item * + +filled(field) : determines whether a given field has been filled + +=back + +ERROR FUNCTIONS + +=over 4 + +=item * + +output_blank_field_error(server reference) : outputs a message saying that +more fields need to be filled in + +=item * + +output_date_error(server reference, error message) : outputs +an error message specific to bad date format. + +=back + +=cut