1: # The LearningOnline Network with CAPA
2: # Search Catalog
3: #
4: # $Id: lonsearchcat.pm,v 1.215 2004/04/22 20:05:18 matthew Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###############################################################################
29: ###############################################################################
30:
31: =pod
32:
33: =head1 NAME
34:
35: lonsearchcat - LONCAPA Search Interface
36:
37: =head1 SYNOPSIS
38:
39: Search interface to LON-CAPAs digital library
40:
41: =head1 DESCRIPTION
42:
43: This module enables searching for a distributed browseable catalog.
44:
45: This is part of the LearningOnline Network with CAPA project
46: described at http://www.lon-capa.org.
47:
48: lonsearchcat presents the user with an interface to search the LON-CAPA
49: digital library. lonsearchcat also initiates the execution of a search
50: by sending the search parameters to LON-CAPA servers. The progress of
51: search (on a server basis) is displayed to the user in a separate window.
52:
53: =head1 Internals
54:
55: =over 4
56:
57: =cut
58:
59: ###############################################################################
60: ###############################################################################
61:
62: package Apache::lonsearchcat;
63:
64: use strict;
65: use Apache::Constants qw(:common :http);
66: use Apache::lonnet();
67: use Apache::File();
68: use CGI qw(:standard);
69: use Text::Query;
70: use GDBM_File;
71: use Apache::loncommon();
72: use Apache::lonmysql();
73: use Apache::lonmeta;
74: use Apache::lonhtmlcommon;
75: use Apache::lonlocal;
76: use LONCAPA::lonmetadata();
77: use HTML::Entities();
78:
79: ######################################################################
80: ######################################################################
81: ##
82: ## Global variables
83: ##
84: ######################################################################
85: ######################################################################
86: my %groupsearch_db; # Database hash used to save values for the
87: # groupsearch RAT interface.
88: my %persistent_db; # gdbm hash which holds data which is supposed to
89: # persist across calls to lonsearchcat.pm
90:
91: # The different view modes and associated functions
92:
93: my %Views = ("detailed" => \&detailed_citation_view,
94: "summary" => \&summary_view,
95: "fielded" => \&fielded_format_view,
96: "xml" => \&xml_sgml_view,
97: "compact" => \&compact_view);
98:
99: ######################################################################
100: ######################################################################
101: sub handler {
102: my $r = shift;
103: # &set_defaults();
104: #
105: # set form defaults
106: #
107: my $hidden_fields;# Hold all the hidden fields used to keep track
108: # of the search system state
109: my $importbutton; # button to take the selected results and go to group
110: # sorting
111: my $diropendb; # The full path to the (temporary) search database file.
112: # This is set and used in &handler() and is also used in
113: # &output_results().
114: my $bodytag; # LON-CAPA standard body tag, gotten from
115: # &Apache::lonnet::bodytag.
116: # No title, no table, just a <body> tag.
117:
118: my $loaderror=&Apache::lonnet::overloaderror($r);
119: if ($loaderror) { return $loaderror; }
120:
121: my $closebutton; # button that closes the search window
122: # This button is different for the RAT compared to
123: # normal invocation.
124: #
125: &Apache::loncommon::content_type($r,'text/html');
126: $r->send_http_header;
127: return OK if $r->header_only;
128: ##
129: ## Prevent caching of the search interface window. Hopefully this means
130: ## we will get the launch=1 passed in a little more.
131: &Apache::loncommon::no_cache($r);
132: ##
133: ## Pick up form fields passed in the links.
134: ##
135: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
136: ['catalogmode','launch','acts','mode','form','element','pause',
137: 'phase','persistent_db_id','table','start','show',
138: 'cleargroupsort','titleelement']);
139: ##
140: ## The following is a trick - we wait a few seconds if asked to so
141: ## the daemon running the search can get ahead of the daemon
142: ## printing the results. We only need (theoretically) to do
143: ## this once, so the pause indicator is deleted
144: ##
145: if (exists($ENV{'form.pause'})) {
146: sleep(1);
147: delete($ENV{'form.pause'});
148: }
149: ##
150: ## Initialize global variables
151: ##
152: my $domain = $r->dir_config('lonDefDomain');
153: $diropendb= "/home/httpd/perl/tmp/".
154: "$ENV{'user.domain'}_$ENV{'user.name'}_searchcat.db";
155: #
156: # set the name of the persistent database
157: # $ENV{'form.persistent_db_id'} can only have digits in it.
158: if (! exists($ENV{'form.persistent_db_id'}) ||
159: ($ENV{'form.persistent_db_id'} =~ /\D/) ||
160: ($ENV{'form.launch'} eq '1')) {
161: $ENV{'form.persistent_db_id'} = time;
162: }
163: $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
164: my $persistent_db_file = "/home/httpd/perl/tmp/".
165: &Apache::lonnet::escape($domain).
166: '_'.&Apache::lonnet::escape($ENV{'user.name'}).
167: '_'.$ENV{'form.persistent_db_id'}.'_persistent_search.db';
168: ##
169: &Apache::lonhtmlcommon::clear_breadcrumbs();
170: if (exists($ENV{'request.course.id'}) && $ENV{'request.course.id'} ne '') {
171: &Apache::lonhtmlcommon::add_breadcrumb
172: ({href=>'/adm/searchcat?'.
173: 'catalogmode='.$ENV{'form.catalogmode'}.
174: '&launch='.$ENV{'form.launch'}.
175: '&mode='.$ENV{'form.mode'},
176: text=>"Course and Catalog Search",
177: bug=>'Searching',});
178: } else {
179: &Apache::lonhtmlcommon::add_breadcrumb
180: ({href=>'/adm/searchcat?'.
181: 'catalogmode='.$ENV{'form.catalogmode'}.
182: '&launch='.$ENV{'form.launch'}.
183: '&mode='.$ENV{'form.mode'},
184: text=>"Catalog Search",
185: bug=>'Searching',});
186: }
187: #
188: if (! &get_persistent_form_data($persistent_db_file)) {
189: if ($ENV{'form.phase'} =~ /(run_search|results)/) {
190: &Apache::lonnet::logthis("lonsearchcat:Unable to recover data ".
191: "from $persistent_db_file");
192: $r->print(<<END);
193: <html>
194: <head><title>LON-CAPA Search Error</title></head>
195: $bodytag
196: We were unable to retrieve data describing your search. This is a serious
197: error and has been logged. Please alert your LON-CAPA administrator.
198: </body>
199: </html>
200: END
201: return OK;
202: }
203: }
204: ##
205: ## Clear out old values from groupsearch database
206: ##
207: untie %groupsearch_db if (tied(%groupsearch_db));
208: if (($ENV{'form.cleargroupsort'} eq '1') ||
209: (($ENV{'form.launch'} eq '1') &&
210: ($ENV{'form.catalogmode'} eq 'groupsearch'))) {
211: if (tie(%groupsearch_db,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
212: &start_fresh_session();
213: untie %groupsearch_db;
214: delete($ENV{'form.cleargroupsort'});
215: } else {
216: # This is a stupid error to give to the user.
217: # It really tells them nothing.
218: $r->print('<html><head></head>'.$bodytag.
219: 'Unable to tie hash to db file</body></html>');
220: return OK;
221: }
222: }
223: ##
224: ## Configure hidden fields
225: ##
226: $hidden_fields = '<input type="hidden" name="persistent_db_id" value="'.
227: $ENV{'form.persistent_db_id'}.'" />'."\n";
228: if (exists($ENV{'form.catalogmode'})) {
229: $hidden_fields .= '<input type="hidden" name="catalogmode" value="'.
230: $ENV{'form.catalogmode'}.'" />'."\n";
231: }
232: if (exists($ENV{'form.form'})) {
233: $hidden_fields .= '<input type="hidden" name="form" value="'.
234: $ENV{'form.form'}.'" />'."\n";
235: }
236: if (exists($ENV{'form.element'})) {
237: $hidden_fields .= '<input type="hidden" name="element" value="'.
238: $ENV{'form.element'}.'" />'."\n";
239: }
240: if (exists($ENV{'form.titleelement'})) {
241: $hidden_fields .= '<input type="hidden" name="titleelement" value="'.
242: $ENV{'form.titleelement'}.'" />'."\n";
243: }
244: if (exists($ENV{'form.mode'})) {
245: $hidden_fields .= '<input type="hidden" name="mode" value="'.
246: $ENV{'form.mode'}.'" />'."\n";
247: }
248: ##
249: ## Configure dynamic components of interface
250: ##
251: if ($ENV{'form.catalogmode'} eq 'interactive') {
252: $closebutton="<input type='button' name='close' value='CLOSE' ";
253: if ($ENV{'form.phase'} =~ /(results|run_search)/) {
254: $closebutton .="onClick='parent.close()'";
255: } else {
256: $closebutton .="onClick='self.close()'";
257: }
258: $closebutton .=">\n";
259: } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') {
260: $closebutton="<input type='button' name='close' value='CLOSE' ";
261: if ($ENV{'form.phase'} =~ /(results|run_search)/) {
262: $closebutton .="onClick='parent.close()'";
263: } else {
264: $closebutton .="onClick='self.close()'";
265: }
266: $closebutton .= ">";
267: $importbutton=<<END;
268: <input type='button' name='import' value='IMPORT'
269: onClick='javascript:select_group()'>
270: END
271: } else {
272: $closebutton = '';
273: $importbutton = '';
274: }
275: ##
276: ## Sanity checks on form elements
277: ##
278: if (!defined($ENV{'form.viewselect'})) {
279: if (($ENV{'form.catalogmode'} eq 'groupsearch') ||
280: ($ENV{'form.catalogmode'} eq 'interactive')) {
281: $ENV{'form.viewselect'} ="Compact View";
282: } else {
283: $ENV{'form.viewselect'} ="Detailed Citation View";
284: }
285: }
286: $ENV{'form.phase'} = 'disp_basic' if (! exists($ENV{'form.phase'}));
287: $ENV{'form.show'} = 20 if (! exists($ENV{'form.show'}));
288: #
289: $ENV{'form.searchmode'} = 'basic';
290: if ($ENV{'form.phase'} eq 'adv_search' ||
291: $ENV{'form.phase'} eq 'disp_adv') {
292: $ENV{'form.searchmode'} = 'advanced';
293: } elsif ($ENV{'form.phase'} eq 'course_search') {
294: $ENV{'form.searchmode'} = 'course_search';
295: }
296: #
297: if ($ENV{'form.searchmode'} eq 'advanced') {
298: &Apache::lonhtmlcommon::add_breadcrumb
299: ({href=>'/adm/searchcat?phase=disp_adv&'.
300: 'catalogmode='.$ENV{'form.catalogmode'}.
301: '&launch='.$ENV{'form.launch'}.
302: '&mode='.$ENV{'form.mode'},
303: text=>"Advanced Search",
304: bug=>'Searching',});
305: } elsif ($ENV{'form.searchmode'} eq 'course search') {
306: &Apache::lonhtmlcommon::add_breadcrumb
307: ({href=>'/adm/searchcat?phase=disp_adv&'.
308: 'catalogmode='.$ENV{'form.catalogmode'}.
309: '&launch='.$ENV{'form.launch'}.
310: '&mode='.$ENV{'form.mode'},
311: text=>"Course Search",
312: bug=>'Searching',});
313: }
314: ##
315: ## Switch on the phase
316: ##
317: if ($ENV{'form.phase'} eq 'disp_basic') {
318: &print_basic_search_form($r,$closebutton,$hidden_fields);
319: } elsif ($ENV{'form.phase'} eq 'disp_adv') {
320: &print_advanced_search_form($r,$closebutton,$hidden_fields);
321: } elsif ($ENV{'form.phase'} eq 'results') {
322: &display_results($r,$importbutton,$closebutton,$diropendb);
323: } elsif ($ENV{'form.phase'} =~ /^(sort|run_search)$/) {
324: my ($query,$customquery,$customshow,$libraries,$pretty_string) =
325: &get_persistent_data($persistent_db_file,
326: ['query','customquery','customshow',
327: 'libraries','pretty_string']);
328: if ($ENV{'form.phase'} eq 'sort') {
329: &print_sort_form($r,$pretty_string);
330: } elsif ($ENV{'form.phase'} eq 'run_search') {
331: &run_search($r,$query,$customquery,$customshow,
332: $libraries,$pretty_string);
333: }
334: } elsif ($ENV{'form.phase'} eq 'course_search') {
335: &course_search($r);
336: } elsif(($ENV{'form.phase'} eq 'basic_search') ||
337: ($ENV{'form.phase'} eq 'adv_search')) {
338: # Set up table
339: if (! defined(&create_results_table())) {
340: my $errorstring=&Apache::lonmysql::get_error();
341: &Apache::lonnet::logthis('lonsearchcat.pm: Unable to create '.
342: 'needed table. lonmysql error:'.
343: $errorstring);
344: $r->print(<<END);
345: <html><head><title>Search Error</title></head>
346: $bodytag
347: Unable to create table in which to store search results.
348: The search has been aborted.
349: </body>
350: </html>
351: END
352: return OK;
353: }
354: delete($ENV{'form.launch'});
355: if (! &make_form_data_persistent($r,$persistent_db_file)) {
356: $r->print(<<END);
357: <html><head><title>Search Error</title></head>
358: $bodytag
359: Unable to properly store search information. The search has been aborted.
360: </body>
361: </html>
362: END
363: return OK;
364: }
365: #
366: # We are running a search
367: my ($query,$customquery,$customshow,$libraries) =
368: (undef,undef,undef,undef);
369: my $pretty_string;
370: if ($ENV{'form.phase'} eq 'basic_search') {
371: ($query,$pretty_string,$libraries) =
372: &parse_basic_search($r,$closebutton,$hidden_fields);
373: } else { # Advanced search
374: ($query,$customquery,$customshow,$libraries,$pretty_string)
375: = &parse_advanced_search($r,$closebutton,$hidden_fields);
376: return OK if (! defined($query));
377: }
378: &make_persistent({ query => $query,
379: customquery => $customquery,
380: customshow => $customshow,
381: libraries => $libraries,
382: pretty_string => $pretty_string },
383: $persistent_db_file);
384: ##
385: ## Print out the frames interface
386: ##
387: &print_frames_interface($r);
388: }
389: return OK;
390: }
391:
392: ######################################################################
393: ######################################################################
394: ##
395: ## Course Search
396: ##
397: ######################################################################
398: ######################################################################
399: { # Scope the course search to avoid global variables
400: #
401: # Variables For course search
402: my %alreadyseen;
403: my %hash;
404: my $totalfound;
405:
406: sub course_search {
407: my $r=shift;
408: my $bodytag=&Apache::loncommon::bodytag('Course Search').
409: &Apache::loncommon::help_open_bug('Searching');
410: my $pretty_search_string = '<b>'.$ENV{'form.courseexp'}.'</b>';
411: my $search_string = $ENV{'form.courseexp'};
412: my @New_Words;
413: if ($ENV{'form.crsrelated'}) {
414: ($search_string,@New_Words) = &related_version($ENV{'form.courseexp'});
415: if (@New_Words) {
416: $pretty_search_string .= ' '.&mt("with related words").": <b>@New_Words</b>.";
417: } else {
418: $pretty_search_string .= ' '.&mt('with no related words').".";
419: }
420: }
421: my $fulltext=$ENV{'form.crsfulltext'};
422: my @allwords=($search_string,@New_Words);
423: $totalfound=0;
424: $r->print('<html><head><title>LON-CAPA Course Search</title></head>'.
425: $bodytag.'<hr /><center><font size="+2" face="arial">'.$pretty_search_string.'</font></center><hr />');
426: $r->rflush();
427: # ======================================================= Go through the course
428: undef %alreadyseen;
429: %alreadyseen=();
430: my $c=$r->connection;
431: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.".db",
432: &GDBM_READER(),0640)) {
433: foreach (keys %hash) {
434: if ($c->aborted()) { last; }
435: if (($_=~/^src\_(.+)$/) && (!$alreadyseen{$hash{$_}})) {
436: &checkonthis($r,$hash{$_},0,$hash{'title_'.$1},$fulltext,
437: @allwords);
438: }
439: }
440: untie(%hash);
441: }
442: unless ($totalfound) {
443: $r->print('<p>'.&mt('No resources found').'.</p>');
444: }
445: # =================================================== Done going through course
446: $r->print('</body></html>');
447: }
448:
449: # =============================== This pulls up a resource and its dependencies
450:
451: sub checkonthis {
452: my ($r,$url,$level,$title,$fulltext,@allwords)=@_;
453: $alreadyseen{$url}=1;
454: $r->rflush();
455: my $result=&Apache::lonnet::metadata($url,'title').' '.
456: &Apache::lonnet::metadata($url,'subject').' '.
457: &Apache::lonnet::metadata($url,'abstract').' '.
458: &Apache::lonnet::metadata($url,'keywords');
459: if (($url) && ($fulltext)) {
460: $result.=&Apache::lonnet::ssi_body($url);
461: }
462: $result=~s/\s+/ /gs;
463: my $applies=0;
464: foreach (@allwords) {
465: if ($_=~/\w/) {
466: if ($result=~/$_/si) {
467: $applies++;
468: }
469: }
470: }
471: # Does this resource apply?
472: if ($applies) {
473: $r->print('<br />');
474: for (my $i=0;$i<=$level*5;$i++) {
475: $r->print(' ');
476: }
477: $r->print('<a href="'.$url.'" target="cat">'.
478: ($title?$title:$url).'</a><br />');
479: $totalfound++;
480: } elsif ($fulltext) {
481: $r->print(' .');
482: }
483: $r->rflush();
484: # Check also the dependencies of this one
485: my $dependencies=
486: &Apache::lonnet::metadata($url,'dependencies');
487: foreach (split(/\,/,$dependencies)) {
488: if (($_=~/^\/res\//) && (!$alreadyseen{$_})) {
489: &checkonthis($r,$_,$level+1,'',$fulltext,@allwords);
490: }
491: }
492: }
493:
494: sub untiehash {
495: if (tied(%hash)) {
496: untie(%hash);
497: }
498: }
499:
500: } # End of course search scoping
501:
502: sub search_html_header {
503: my $Str = <<ENDHEADER;
504: <html>
505: <head>
506: <title>The LearningOnline Network with CAPA</title>
507: <script type="text/javascript">
508: function openhelp(val) {
509: openhelpwin=open('/adm/help/searchcat.html','helpscreen',
510: 'scrollbars=1,width=600,height=300');
511: openhelpwin.focus();
512: }
513: </script>
514: </head>
515: ENDHEADER
516: return $Str;
517: }
518:
519: ######################################################################
520: ######################################################################
521:
522: =pod
523:
524: =item &print_basic_search_form()
525:
526: Prints the form for the basic search. Sorry the name is so cryptic.
527:
528: =cut
529:
530: ######################################################################
531: ######################################################################
532: sub print_basic_search_form {
533: my ($r,$closebutton,$hidden_fields) = @_;
534: my $bodytag=&Apache::loncommon::bodytag('Search').
535: &Apache::lonhtmlcommon::breadcrumbs(undef,'Searching','Finding_Resources',
536: undef,undef,! $ENV{'form.launch'});
537: my $scrout = &search_html_header().$bodytag;
538: if (&Apache::lonnet::allowed('bre',$ENV{'request.role.domain'})) {
539: # Define interface components
540: my $userelatedwords=
541: &mt('[_1] use related words',
542: &Apache::lonhtmlcommon::checkbox
543: ('related',$ENV{'form.related'}));
544: my $onlysearchdomain=
545: &mt('[_1] only search domain [_2]',
546: &Apache::lonhtmlcommon::checkbox
547: ('domains',$ENV{'form.domains'}),
548: $r->dir_config('lonDefDomain'));
549: my $adv_search_link =
550: '<a href="/adm/searchcat?'.
551: 'phase=disp_adv&'.
552: 'catalogmode='.$ENV{'form.catalogmode'}.
553: '&launch='.$ENV{'form.launch'}.
554: '&mode='.$ENV{'form.mode'}.
555: '">'.&mt('Advanced Search').'</a>';
556: #
557: $scrout.='<form name="loncapa_search" method="post" '.
558: 'action="/adm/searchcat">'.
559: '<input type="hidden" name="phase" value="basic_search" />'.
560: $hidden_fields;
561: #
562: $scrout .= '<center>'.$/;
563: if ($ENV{'request.course.id'}) {
564: $scrout .= '<h1>'.&mt('LON-CAPA Catalog Search').'</h1>';
565: } else {
566: # No need to tell them they are searching
567: $scrout.= ('<br />'x2);
568: }
569: $scrout.='<table>'.
570: '<tr><td align="center" valign="top">'.
571: &Apache::lonhtmlcommon::textbox('basicexp',
572: $ENV{'form.basicexp'},50).'<br />'.
573: '<font size="-1">'.&searchhelp().'</font>'.'</td>'.
574: '<td><font size="-1">'.
575: '<nobr>'.(' 'x3).$adv_search_link.'</nobr>'.'<br />'.
576: '<nobr>'.(' 'x1).$userelatedwords.'</nobr>'.'<br />'.
577: '<nobr>'.(' 'x1).$onlysearchdomain.'</nobr>'.'<br />'.
578: '</font></td>'.
579: '</tr>'.$/;
580: #
581: # $scrout .= '<tr><td align="center">'.
582: # '<font size="-1">'.
583: # $userelatedwords.(' 'x3).
584: # $onlysearchdomain.(' 'x2).$adv_search_link.
585: # '</font>'.
586: # '</td></tr>'.$/;
587: $scrout .= '<tr><td align="center" colspan="2">'.
588: '<font size="-1">'.
589: '<input type="submit" name="basicsubmit" '.
590: 'value="'.&mt('Search').'" />'.
591: (' 'x2).$closebutton.(' 'x2).&viewoptions().
592: '</font>'.
593: '</td></tr>'.$/;
594: $scrout .= '</table>'.$/.'</center>'.'</form>';
595: }
596: if ($ENV{'request.course.id'}) {
597: my %lt=&Apache::lonlocal::texthash('srch' => 'Search',
598: 'header' => 'Course Search',
599: 'note' => 'Enter terms or phrases, then press "Search" below',
600: 'use' => 'use related words',
601: 'full' =>'fulltext search (time consuming)'
602: );
603: $scrout.=(<<ENDCOURSESEARCH);
604: <form name="loncapa_search" method="post" action="/adm/searchcat">
605: <center>
606: <hr />
607: <h1>$lt{'header'}</h1>
608: <input type="hidden" name="phase" value="course_search" />
609: $hidden_fields
610: <p>
611: $lt{'note'}.
612: </p>
613: <p>
614: <table>
615: <tr><td>
616: ENDCOURSESEARCH
617: $scrout.=' '.
618: &Apache::lonhtmlcommon::textbox('courseexp',
619: $ENV{'form.courseexp'},40);
620: my $crscheckbox =
621: &Apache::lonhtmlcommon::checkbox('crsfulltext',
622: $ENV{'form.crsfulltext'});
623: my $relcheckbox =
624: &Apache::lonhtmlcommon::checkbox('crsrelated',
625: $ENV{'form.crsrelated'});
626: $scrout.=(<<ENDENDCOURSE);
627: </td></tr>
628: <tr><td>$relcheckbox $lt{'use'}</td><td></td></tr>
629: <tr><td>$crscheckbox $lt{'full'}</td><td></td></tr>
630: </table><p>
631: <input type="submit" name="coursesubmit" value='$lt{'srch'}' />
632: </p>
633: </center>
634: </form>
635: ENDENDCOURSE
636: }
637: $scrout.=(<<ENDDOCUMENT);
638: </body>
639: </html>
640: ENDDOCUMENT
641: $r->print($scrout);
642: return;
643: }
644: ######################################################################
645: ######################################################################
646:
647: =pod
648:
649: =item &advanced_search_form()
650:
651: Prints the advanced search form.
652:
653: =cut
654:
655: ######################################################################
656: ######################################################################
657: sub print_advanced_search_form{
658: my ($r,$closebutton,$hidden_fields) = @_;
659: my %lt=&Apache::lonlocal::texthash('srch' => 'Search',
660: 'reset' => 'Reset',
661: 'help' => 'Help');
662: my $advanced_buttons = <<"END";
663: <p>
664: <input type="submit" name="advancedsubmit" value='$lt{"srch"}' />
665: <input type="reset" name="reset" value='$lt{"reset"}' />
666: $closebutton
667: <input type="button" value="$lt{'help'}" onClick="openhelp()" />
668: END
669: my $bodytag=&Apache::loncommon::bodytag('Advanced Catalog Search').
670: &Apache::lonhtmlcommon::breadcrumbs(undef,'Searching',
671: 'Finding_Resources',
672: undef,undef,
673: ! $ENV{'form.launch'});
674: my $searchhelp=&searchhelp();
675: my $scrout=&search_html_header();
676: $scrout .= <<"ENDHEADER";
677: $bodytag
678: <form method="post" action="/adm/searchcat" name="advsearch">
679: $advanced_buttons
680: ENDHEADER
681: $scrout.=(' 'x2).&viewoptions().'</p>'.$hidden_fields.
682: '<input type="hidden" name="phase" value="adv_search" />';
683: my %fields=&Apache::lonmeta::fieldnames();
684: #
685: $scrout.= '<p>'.$searchhelp.'</p>'.
686: "<table>\n";
687: my %related_word_search =
688: ('title'=>1,
689: 'author'=>0,
690: 'owner'=>0,
691: 'authorspace'=>0,
692: 'modifyinguser'=>0,
693: 'keywords'=>1,
694: 'notes'=>1,
695: 'abstract'=>1,
696: 'standards'=>1,
697: 'mime'=>1,
698: );
699: #
700: foreach my $field ('title','author','owner','authorspace','modifyinguser',
701: 'keywords','notes','abstract','standards','mime') {
702: $scrout.='<tr><td align="right">'.&titlefield($fields{$field}).'</td><td>'.
703: &Apache::lonmeta::prettyinput($field,
704: $ENV{'form.'.$field},
705: $field,
706: 'advsearch',
707: $related_word_search{$field},
708: '</td><td align="left">',
709: $ENV{'form.'.$field.'_related'},
710: 50);
711: if ($related_word_search{$field}) {
712: $scrout .= 'related words';
713: } else {
714: $scrout .= '</td><td> ';
715: }
716: $scrout .= '</td></tr>'.$/;
717: }
718: foreach my $field ('lowestgradelevel','highestgradelevel') {
719: $scrout.='<tr>'.
720: '<td align="right">'.&titlefield($fields{$field}).'</td>'.
721: '<td colspan="2">'.
722: &Apache::lonmeta::prettyinput($field,
723: $ENV{'form.'.$field},
724: $field,
725: 'advsearch',
726: 0).
727: '</td></tr>'.$/;
728: }
729: $scrout.='<tr><td align="right">'.
730: &titlefield(&mt('MIME Type Category')).'</td><td colspan="2">'.
731: &Apache::loncommon::filecategoryselect('category',
732: $ENV{'form.category'}).
733: '</td></tr>'.$/;
734: $scrout.='<tr><td align="right" valign="top">'.
735: &titlefield(&mt('Domains')).'</td><td colspan="2">'.
736: &Apache::loncommon::domain_select('domains',
737: $ENV{'form.domains'},1).
738: '</td></tr>'.$/;
739: $scrout .= "</table>\n<br />\n<table>\n";
740: my %dates=&Apache::lonlocal::texthash
741: ('creationdatestart' => 'Creation Date After',
742: 'creationdateend' => 'Creation Date Before',
743: 'lastrevisiondatestart' => 'Last Revision Date After',
744: 'lastrevisiondateend' => 'Last Revision Date Before');
745: foreach my $field (sort keys %dates) {
746: $scrout.='<tr>'.
747: '<td align="right">'.&titlefield($dates{$field}).'</td><td>'.
748: &Apache::lonhtmlcommon::date_setter('advsearch',$field,0,'',1).
749: '</td></tr>'.$/;
750: }
751: $scrout.="</table>\n";
752: $scrout.=<<ENDDOCUMENT;
753: $advanced_buttons
754: </form>
755: </body>
756: </html>
757: ENDDOCUMENT
758: $r->print($scrout);
759: return;
760: }
761:
762: ######################################################################
763: ######################################################################
764:
765: =pod
766:
767: =item &titlefield()
768:
769: Inputs: title text
770:
771: Outputs: titletext with font wrapper
772:
773: =cut
774:
775: ######################################################################
776: ######################################################################
777: sub titlefield {
778: my $title=shift;
779: return $title;
780: }
781:
782: ######################################################################
783: ######################################################################
784:
785: =pod
786:
787: =item viewoptiontext()
788:
789: Inputs: codename for view option
790:
791: Outputs: displayed text
792:
793: =cut
794:
795: ######################################################################
796: ######################################################################
797: sub viewoptiontext {
798: my $code=shift;
799: my %desc=&Apache::lonlocal::texthash
800: ('detailed' => "Detailed Citation View",
801: 'xml' => 'XML/SGML',
802: 'compact' => 'Compact View',
803: 'fielded' => 'Fielded Format',
804: 'summary' => 'Summary View');
805: return $desc{$code};
806: }
807:
808: ######################################################################
809: ######################################################################
810:
811: =pod
812:
813: =item viewoptions()
814:
815: Inputs: none
816:
817: Outputs: text for box with view options
818:
819: =cut
820:
821: ######################################################################
822: ######################################################################
823: sub viewoptions {
824: my $scrout="\n".'<nobr>';
825: if (! defined($ENV{'form.viewselect'})) {
826: $ENV{'form.viewselect'}='detailed';
827: }
828: $scrout.=&Apache::lonmeta::selectbox('viewselect',
829: $ENV{'form.viewselect'},
830: \&viewoptiontext,
831: sort(keys(%Views)));
832: $scrout.= ' ';
833: my $countselect = &Apache::lonmeta::selectbox('show',
834: $ENV{'form.show'},
835: undef,
836: (10,20,50,100,1000,10000));
837: $scrout .= (' 'x2).&mt('[_1] Records per Page',$countselect).
838: '</nobr>'.$/;
839: return $scrout;
840: }
841:
842: ######################################################################
843: ######################################################################
844:
845: =pod
846:
847: =item searchhelp()
848:
849: Inputs: none
850:
851: Outputs: return little blurb on how to enter searches
852:
853: =cut
854:
855: ######################################################################
856: ######################################################################
857: sub searchhelp {
858: return &mt('Enter terms or phrases separated by AND, OR, or NOT');
859: }
860:
861: ######################################################################
862: ######################################################################
863:
864: =pod
865:
866: =item &get_persistent_form_data()
867:
868: Inputs: filename of database
869:
870: Outputs: returns undef on database errors.
871:
872: This function is the reverse of &make_persistent() for form data.
873: Retrieve persistent data from %persistent_db. Retrieved items will have their
874: values unescaped. If a form value already exists in $ENV, it will not be
875: overwritten. Form values that are array references may have values appended
876: to them.
877:
878: =cut
879:
880: ######################################################################
881: ######################################################################
882: sub get_persistent_form_data {
883: my $filename = shift;
884: return 0 if (! -e $filename);
885: return undef if (! tie(%persistent_db,'GDBM_File',$filename,
886: &GDBM_READER(),0640));
887: #
888: # These make sure we do not get array references printed out as 'values'.
889: my %arrays_allowed = ('form.domains'=>1);
890: #
891: # Loop through the keys, looking for 'form.'
892: foreach my $name (keys(%persistent_db)) {
893: next if ($name !~ /^form./);
894: # Kludgification begins!
895: if ($name eq 'form.domains' &&
896: $ENV{'form.searchmode'} eq 'basic' &&
897: $ENV{'form.phase'} ne 'disp_basic') {
898: next;
899: }
900: # End kludge (hopefully)
901: next if (exists($ENV{$name}));
902: my @values = map {
903: &Apache::lonnet::unescape($_);
904: } split(',',$persistent_db{$name});
905: next if (@values <1);
906: if ($arrays_allowed{$name}) {
907: $ENV{$name} = [@values];
908: } else {
909: $ENV{$name} = $values[0] if ($values[0]);
910: }
911: }
912: untie (%persistent_db);
913: return 1;
914: }
915:
916: ######################################################################
917: ######################################################################
918:
919: =pod
920:
921: =item &get_persistent_data()
922:
923: Inputs: filename of database, ref to array of values to recover.
924:
925: Outputs: array of values. Returns undef on error.
926:
927: This function is the reverse of &make_persistent();
928: Retrieve persistent data from %persistent_db. Retrieved items will have their
929: values unescaped. If the item contains commas (before unescaping), the
930: returned value will be an array pointer.
931:
932: =cut
933:
934: ######################################################################
935: ######################################################################
936: sub get_persistent_data {
937: my $filename = shift;
938: my @Vars = @{shift()};
939: my @Values; # Return array
940: return undef if (! -e $filename);
941: return undef if (! tie(%persistent_db,'GDBM_File',$filename,
942: &GDBM_READER(),0640));
943: foreach my $name (@Vars) {
944: if (! exists($persistent_db{$name})) {
945: push @Values, undef;
946: next;
947: }
948: my @values = map {
949: &Apache::lonnet::unescape($_);
950: } split(',',$persistent_db{$name});
951: if (@values <= 1) {
952: push @Values,$values[0];
953: } else {
954: push @Values,\@values;
955: }
956: }
957: untie (%persistent_db);
958: return @Values;
959: }
960:
961: ######################################################################
962: ######################################################################
963:
964: =pod
965:
966: =item &make_persistent()
967:
968: Inputs: Hash of values to save, filename of persistent database.
969:
970: Store variables away to the %persistent_db.
971: Values will be escaped. Values that are array pointers will have their
972: elements escaped and concatenated in a comma separated string.
973:
974: =cut
975:
976: ######################################################################
977: ######################################################################
978: sub make_persistent {
979: my %save = %{shift()};
980: my $filename = shift;
981: return undef if (! tie(%persistent_db,'GDBM_File',
982: $filename,&GDBM_WRCREAT(),0640));
983: foreach my $name (keys(%save)) {
984: my @values = (ref($save{$name}) ? @{$save{$name}} : ($save{$name}));
985: # We handle array references, but not recursively.
986: my $store = join(',', map { &Apache::lonnet::escape($_); } @values );
987: $persistent_db{$name} = $store;
988: }
989: untie(%persistent_db);
990: return 1;
991: }
992:
993: ######################################################################
994: ######################################################################
995:
996: =pod
997:
998: =item &make_form_data_persistent()
999:
1000: Inputs: filename of persistent database.
1001:
1002: Store most form variables away to the %persistent_db.
1003: Values will be escaped. Values that are array pointers will have their
1004: elements escaped and concatenated in a comma separated string.
1005:
1006: =cut
1007:
1008: ######################################################################
1009: ######################################################################
1010: sub make_form_data_persistent {
1011: my $r = shift;
1012: my $filename = shift;
1013: my %save;
1014: foreach (keys(%ENV)) {
1015: next if (!/^form/ || /submit/);
1016: $save{$_} = $ENV{$_};
1017: }
1018: return &make_persistent(\%save,$filename);
1019: }
1020:
1021: ######################################################################
1022: ######################################################################
1023:
1024: =pod
1025:
1026: =item &parse_advanced_search()
1027:
1028: Parse advanced search form and return the following:
1029:
1030: =over 4
1031:
1032: =item $query Scalar containing an SQL query.
1033:
1034: =item $customquery Scalar containing a custom query.
1035:
1036: =item $customshow Scalar containing commands to show custom metadata.
1037:
1038: =item $libraries_to_query Reference to array of domains to search.
1039:
1040: =back
1041:
1042: =cut
1043:
1044: ######################################################################
1045: ######################################################################
1046: sub parse_advanced_search {
1047: my ($r,$closebutton,$hidden_fields)=@_;
1048: my $fillflag=0;
1049: my $pretty_search_string = "<br />\n";
1050: # Clean up fields for safety
1051: for my $field ('title','author','subject','keywords','url','version',
1052: 'creationdatestart_month','creationdatestart_day',
1053: 'creationdatestart_year','creationdateend_month',
1054: 'creationdateend_day','creationdateend_year',
1055: 'lastrevisiondatestart_month','lastrevisiondatestart_day',
1056: 'lastrevisiondatestart_year','lastrevisiondateend_month',
1057: 'lastrevisiondateend_day','lastrevisiondateend_year',
1058: 'notes','abstract','extension','language','owner',
1059: 'custommetadata','customshow','category') {
1060: $ENV{"form.$field"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1061: }
1062: foreach ('mode','form','element') {
1063: # is this required? Hmmm.
1064: next unless (exists($ENV{"form.$_"}));
1065: $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"});
1066: $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1067: }
1068: # Preprocess the category form element.
1069: $ENV{'form.category'} = 'any' if (! defined($ENV{'form.category'}) ||
1070: ref($ENV{'form.category'}));
1071: #
1072: # Check to see if enough information was filled in
1073: for my $field ('title','author','subject','keywords','url','version',
1074: 'notes','abstract','category','extension','language',
1075: 'owner','custommetadata') {
1076: if (&filled($ENV{"form.$field"})) {
1077: $fillflag++;
1078: }
1079: }
1080: if (! $fillflag) {
1081: &output_blank_field_error($r,$closebutton,
1082: 'phase=disp_adv',$hidden_fields);
1083: return ;
1084: }
1085: # Turn the form input into a SQL-based query
1086: my $query='';
1087: my @queries;
1088: my $font = '<font color="#800000" face="helvetica">';
1089: # Evaluate logical expression AND/OR/NOT phrase fields.
1090: foreach my $field ('title','author','subject','notes','abstract','url',
1091: 'keywords','version','owner','standards') {
1092: if ($ENV{'form.'.$field}) {
1093: my $searchphrase = $ENV{'form.'.$field};
1094: $pretty_search_string .= $font."$field</font> contains <b>".
1095: $searchphrase."</b>";
1096: if ($ENV{'form.'.$field.'_related'}) {
1097: my @New_Words;
1098: ($searchphrase,@New_Words) = &related_version($searchphrase);
1099: if (@New_Words) {
1100: $pretty_search_string .= " with related words: ".
1101: "<b>@New_Words</b>.";
1102: } else {
1103: $pretty_search_string .= " with no related words.";
1104: }
1105: }
1106: $pretty_search_string .= "<br />\n";
1107: push @queries,&build_SQL_query($field,$searchphrase);
1108: }
1109: }
1110: #
1111: # Make the 'mime' from 'form.category' and 'form.extension'
1112: #
1113: my $searchphrase;
1114: if (exists($ENV{'form.category'}) &&
1115: $ENV{'form.category'} !~ /^\s*$/ &&
1116: $ENV{'form.category'} ne 'any') {
1117: my @extensions = &Apache::loncommon::filecategorytypes
1118: ($ENV{'form.category'});
1119: if (scalar(@extensions) > 0) {
1120: $searchphrase = join(' OR ',@extensions);
1121: }
1122: }
1123: if (exists($ENV{'form.extension'}) && $ENV{'form.extension'} !~ /^\s*$/) {
1124: $searchphrase .= ' OR ' if (defined($searchphrase));
1125: my @extensions = split(/,/,$ENV{'form.extension'});
1126: $searchphrase .= join(' OR ',@extensions);
1127: }
1128: if (defined($searchphrase)) {
1129: push @queries,&build_SQL_query('mime',$searchphrase);
1130: $pretty_search_string .=$font.'mime</font> contains <b>'.
1131: $searchphrase.'</b><br />';
1132: }
1133: #
1134: # Evaluate option lists
1135: if ($ENV{'form.language'} and $ENV{'form.language'} ne 'any') {
1136: push @queries,"(language like \"$ENV{'form.language'}\")";
1137: $pretty_search_string.=$font."language</font>= ".
1138: &Apache::loncommon::languagedescription($ENV{'form.language'}).
1139: "<br />\n";
1140: }
1141: if ($ENV{'form.copyright'} and $ENV{'form.copyright'} ne 'any') {
1142: push @queries,"(copyright like \"$ENV{'form.copyright'}\")";
1143: $pretty_search_string.=$font."copyright</font> = ".
1144: &Apache::loncommon::copyrightdescription($ENV{'form.copyright'}).
1145: "<br \>\n";
1146: }
1147: #
1148: # Evaluate date windows
1149: my $datequery=&build_date_queries(
1150: $ENV{'form.creationdatestart_month'},
1151: $ENV{'form.creationdatestart_day'},
1152: $ENV{'form.creationdatestart_year'},
1153: $ENV{'form.creationdateend_month'},
1154: $ENV{'form.creationdateend_day'},
1155: $ENV{'form.creationdateend_year'},
1156: $ENV{'form.lastrevisiondatestart_month'},
1157: $ENV{'form.lastrevisiondatestart_day'},
1158: $ENV{'form.lastrevisiondatestart_year'},
1159: $ENV{'form.lastrevisiondateend_month'},
1160: $ENV{'form.lastrevisiondateend_day'},
1161: $ENV{'form.lastrevisiondateend_year'},
1162: );
1163: # Test to see if date windows are legitimate
1164: if ($datequery=~/^Incorrect/) {
1165: &output_date_error($r,$datequery,$closebutton,$hidden_fields);
1166: return ;
1167: } elsif ($datequery) {
1168: # Here is where you would set up pretty_search_string to output
1169: # date query information.
1170: push @queries,$datequery;
1171: }
1172: #
1173: # Process form information for custom metadata querying
1174: my $customquery=undef;
1175: ##
1176: ## The custom metadata search was removed q long time ago mostly
1177: ## because I was unable to figureout exactly how it worked and could
1178: ## not imagine people actually using it. MH
1179: ##
1180: # if ($ENV{'form.custommetadata'}) {
1181: # $pretty_search_string .=$font."Custom Metadata Search</font>: <b>".
1182: # $ENV{'form.custommetadata'}."</b><br />\n";
1183: # $customquery=&build_custommetadata_query('custommetadata',
1184: # $ENV{'form.custommetadata'});
1185: # }
1186: my $customshow=undef;
1187: # if ($ENV{'form.customshow'}) {
1188: # $pretty_search_string .=$font."Custom Metadata Display</font>: <b>".
1189: # $ENV{'form.customshow'}."</b><br />\n";
1190: # $customshow=$ENV{'form.customshow'};
1191: # $customshow=~s/[^\w\s]//g;
1192: # my @fields=split(/\s+/,$customshow);
1193: # $customshow=join(" ",@fields);
1194: # }
1195: ##
1196: ## Deal with restrictions to given domains
1197: ##
1198: my ($libraries_to_query,$pretty_domains_string) =
1199: &parse_domain_restrictions();
1200: $pretty_search_string .= $pretty_domains_string."<br />\n";
1201: #
1202: if (@queries) {
1203: $query=join(" AND ",@queries);
1204: $query="select * from metadata where $query";
1205: } elsif ($customquery) {
1206: $query = '';
1207: }
1208: return ($query,$customquery,$customshow,$libraries_to_query,
1209: $pretty_search_string);
1210: }
1211:
1212: sub parse_domain_restrictions {
1213: my $libraries_to_query = undef;
1214: # $ENV{'form.domains'} can be either a scalar or an array reference.
1215: # We need an array.
1216: if (! exists($ENV{'form.domains'})) {
1217: return (undef,'');
1218: }
1219: my @allowed_domains;
1220: if (ref($ENV{'form.domains'})) {
1221: @allowed_domains = @{$ENV{'form.domains'}};
1222: } else {
1223: @allowed_domains = ($ENV{'form.domains'});
1224: }
1225: #
1226: my %domain_hash = ();
1227: my $pretty_domains_string;
1228: foreach (@allowed_domains) {
1229: $domain_hash{$_}++;
1230: }
1231: if ($domain_hash{'any'}) {
1232: $pretty_domains_string = "In all LON-CAPA domains.";
1233: } else {
1234: if (@allowed_domains > 1) {
1235: $pretty_domains_string = "In LON-CAPA domains:";
1236: } else {
1237: $pretty_domains_string = "In LON-CAPA domain ";
1238: }
1239: foreach (sort @allowed_domains) {
1240: $pretty_domains_string .= "<b>".$_."</b> ";
1241: }
1242: foreach (keys(%Apache::lonnet::libserv)) {
1243: if (exists($domain_hash{$Apache::lonnet::hostdom{$_}})) {
1244: push @$libraries_to_query,$_;
1245: }
1246: }
1247: }
1248: return ($libraries_to_query,$pretty_domains_string);
1249: }
1250:
1251: ######################################################################
1252: ######################################################################
1253:
1254: =pod
1255:
1256: =item &parse_basic_search()
1257:
1258: Parse the basic search form and return a scalar containing an sql query.
1259:
1260: =cut
1261:
1262: ######################################################################
1263: ######################################################################
1264: sub parse_basic_search {
1265: my ($r,$closebutton)=@_;
1266: #
1267: # Clean up fields for safety
1268: for my $field ('basicexp') {
1269: $ENV{"form.$field"}=~s/[^\w\s\(\)\-]//g;
1270: }
1271: foreach ('mode','form','element') {
1272: # is this required? Hmmm.
1273: next unless (exists($ENV{"form.$_"}));
1274: $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"});
1275: $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1276: }
1277: my ($libraries_to_query,$pretty_domains_string) =
1278: &parse_domain_restrictions();
1279: #
1280: # Check to see if enough of a query is filled in
1281: unless (&filled($ENV{'form.basicexp'})) {
1282: &output_blank_field_error($r,$closebutton,'phase=disp_basic');
1283: return OK;
1284: }
1285: my $pretty_search_string = '<b>'.$ENV{'form.basicexp'}.'</b>';
1286: my $search_string = $ENV{'form.basicexp'};
1287: if ($ENV{'form.related'}) {
1288: my @New_Words;
1289: ($search_string,@New_Words) = &related_version($ENV{'form.basicexp'});
1290: if (@New_Words) {
1291: $pretty_search_string .= " with related words: <b>@New_Words</b>.";
1292: } else {
1293: $pretty_search_string .= " with no related words.";
1294: }
1295: }
1296: #
1297: # Build SQL query string based on form page
1298: my $query='';
1299: my $concatarg=join(',',
1300: ('title', 'author', 'subject', 'notes', 'abstract',
1301: 'keywords'));
1302: $concatarg='title' if $ENV{'form.titleonly'};
1303: $query=&build_SQL_query('concat_ws(" ",'.$concatarg.')',$search_string);
1304: if (defined($pretty_domains_string) && $pretty_domains_string ne '') {
1305: $pretty_search_string .= ' '.$pretty_domains_string;
1306: }
1307: $pretty_search_string .= "<br />\n";
1308: my $final_query = 'SELECT * FROM metadata WHERE '.$query;
1309: # &Apache::lonnet::logthis($final_query);
1310: return ($final_query,$pretty_search_string,
1311: $libraries_to_query);
1312: }
1313:
1314: ######################################################################
1315: ######################################################################
1316:
1317: =pod
1318:
1319: =item &related_version()
1320:
1321: Modifies an input string to include related words. Words in the string
1322: are replaced with parenthesized lists of 'OR'd words. For example
1323: "torque" is replaced with "(torque OR word1 OR word2 OR ...)".
1324:
1325: Note: Using this twice on a string is probably silly.
1326:
1327: =cut
1328:
1329: ######################################################################
1330: ######################################################################
1331: sub related_version {
1332: my $search_string = shift;
1333: my $result = $search_string;
1334: my %New_Words = ();
1335: while ($search_string =~ /(\w+)/cg) {
1336: my $word = $1;
1337: next if (lc($word) =~ /\b(or|and|not)\b/);
1338: my @Words = &Apache::loncommon::get_related_words($word);
1339: @Words = ($#Words>4? @Words[0..4] : @Words);
1340: foreach (@Words) { $New_Words{$_}++;}
1341: my $replacement = join " OR ", ($word,@Words);
1342: $result =~ s/(\b)$word(\b)/$1($replacement)$2/g;
1343: }
1344: return $result,sort(keys(%New_Words));
1345: }
1346:
1347: ######################################################################
1348: ######################################################################
1349:
1350: =pod
1351:
1352: =item &build_SQL_query()
1353:
1354: Builds a SQL query string from a logical expression with AND/OR keywords
1355: using Text::Query and &recursive_SQL_query_builder()
1356:
1357: =cut
1358:
1359: ######################################################################
1360: ######################################################################
1361: sub build_SQL_query {
1362: my ($field_name,$logic_statement)=@_;
1363: my $q=new Text::Query('abc',
1364: -parse => 'Text::Query::ParseAdvanced',
1365: -build => 'Text::Query::Build');
1366: $q->prepare($logic_statement);
1367: my $matchexp=${$q}{'matchexp'}; chomp $matchexp;
1368: my $sql_query=&recursive_SQL_query_build($field_name,$matchexp);
1369: return $sql_query;
1370: }
1371:
1372: ######################################################################
1373: ######################################################################
1374:
1375: =pod
1376:
1377: =item &build_custommetadata_query()
1378:
1379: Constructs a custom metadata query using a rather heinous regular
1380: expression.
1381:
1382: =cut
1383:
1384: ######################################################################
1385: ######################################################################
1386: sub build_custommetadata_query {
1387: my ($field_name,$logic_statement)=@_;
1388: my $q=new Text::Query('abc',
1389: -parse => 'Text::Query::ParseAdvanced',
1390: -build => 'Text::Query::BuildAdvancedString');
1391: $q->prepare($logic_statement);
1392: my $matchexp=${$q}{'-parse'}{'-build'}{'matchstring'};
1393: # quick fix to change literal into xml tag-matching
1394: # will eventually have to write a separate builder module
1395: # wordone=wordtwo becomes\<wordone\>[^\<] *wordtwo[^\<]*\<\/wordone\>
1396: $matchexp =~ s/(\w+)\\=([\w\\\+]+)?# wordone=wordtwo is changed to
1397: /\\<$1\\>?# \<wordone\>
1398: \[\^\\<\]?# [^\<]
1399: \*$2\[\^\\<\]?# *wordtwo[^\<]
1400: \*\\<\\\/$1\\>?# *\<\/wordone\>
1401: /g;
1402: return $matchexp;
1403: }
1404:
1405: ######################################################################
1406: ######################################################################
1407:
1408: =pod
1409:
1410: =item &recursive_SQL_query_build()
1411:
1412: Recursively constructs an SQL query. Takes as input $dkey and $pattern.
1413:
1414: =cut
1415:
1416: ######################################################################
1417: ######################################################################
1418: sub recursive_SQL_query_build {
1419: my ($dkey,$pattern)=@_;
1420: my @matches=($pattern=~/(\[[^\]|\[]*\])/g);
1421: return $pattern unless @matches;
1422: foreach my $match (@matches) {
1423: $match=~/\[ (\w+)\s(.*) \]/;
1424: my ($key,$value)=($1,$2);
1425: my $replacement='';
1426: if ($key eq 'literal') {
1427: $replacement="($dkey LIKE \"\%$value\%\")";
1428: } elsif (lc($key) eq 'not') {
1429: $value=~s/LIKE/NOT LIKE/;
1430: # $replacement="($dkey not like $value)";
1431: $replacement="$value";
1432: } elsif ($key eq 'and') {
1433: $value=~/(.*[\"|\)]) ([|\(|\^].*)/;
1434: $replacement="($1 AND $2)";
1435: } elsif ($key eq 'or') {
1436: $value=~/(.*[\"|\)]) ([|\(|\^].*)/;
1437: $replacement="($1 OR $2)";
1438: }
1439: substr($pattern,
1440: index($pattern,$match),
1441: length($match),
1442: $replacement);
1443: }
1444: &recursive_SQL_query_build($dkey,$pattern);
1445: }
1446:
1447: ######################################################################
1448: ######################################################################
1449:
1450: =pod
1451:
1452: =item &build_date_queries()
1453:
1454: Builds a SQL logic query to check time/date entries.
1455: Also reports errors (check for /^Incorrect/).
1456:
1457: =cut
1458:
1459: ######################################################################
1460: ######################################################################
1461: sub build_date_queries {
1462: my ($cmonth1,$cday1,$cyear1,$cmonth2,$cday2,$cyear2,
1463: $lmonth1,$lday1,$lyear1,$lmonth2,$lday2,$lyear2)=@_;
1464: my @queries;
1465: if ($cmonth1 or $cday1 or $cyear1 or $cmonth2 or $cday2 or $cyear2) {
1466: unless ($cmonth1 and $cday1 and $cyear1 and
1467: $cmonth2 and $cday2 and $cyear2) {
1468: return "Incorrect entry for the creation date. You must specify ".
1469: "a starting month, day, and year and an ending month, ".
1470: "day, and year.";
1471: }
1472: my $cnumeric1=sprintf("%d%2d%2d",$cyear1,$cmonth1,$cday1);
1473: $cnumeric1+=0;
1474: my $cnumeric2=sprintf("%d%2d%2d",$cyear2,$cmonth2,$cday2);
1475: $cnumeric2+=0;
1476: if ($cnumeric1>$cnumeric2) {
1477: return "Incorrect entry for the creation date. The starting ".
1478: "date must occur before the ending date.";
1479: }
1480: my $cquery="(creationdate BETWEEN '$cyear1-$cmonth1-$cday1' AND '".
1481: "$cyear2-$cmonth2-$cday2 23:59:59')";
1482: push @queries,$cquery;
1483: }
1484: if ($lmonth1 or $lday1 or $lyear1 or $lmonth2 or $lday2 or $lyear2) {
1485: unless ($lmonth1 and $lday1 and $lyear1 and
1486: $lmonth2 and $lday2 and $lyear2) {
1487: return "Incorrect entry for the last revision date. You must ".
1488: "specify a starting month, day, and year and an ending ".
1489: "month, day, and year.";
1490: }
1491: my $lnumeric1=sprintf("%d%2d%2d",$lyear1,$lmonth1,$lday1);
1492: $lnumeric1+=0;
1493: my $lnumeric2=sprintf("%d%2d%2d",$lyear2,$lmonth2,$lday2);
1494: $lnumeric2+=0;
1495: if ($lnumeric1>$lnumeric2) {
1496: return "Incorrect entry for the last revision date. The ".
1497: "starting date must occur before the ending date.";
1498: }
1499: my $lquery="(lastrevisiondate BETWEEN '$lyear1-$lmonth1-$lday1' AND '".
1500: "$lyear2-$lmonth2-$lday2 23:59:59')";
1501: push @queries,$lquery;
1502: }
1503: if (@queries) {
1504: return join(" AND ",@queries);
1505: }
1506: return '';
1507: }
1508:
1509: ######################################################################
1510: ######################################################################
1511:
1512: =pod
1513:
1514: =item ©right_check()
1515:
1516: Inputs: $Metadata, a hash pointer of metadata for a resource.
1517:
1518: Returns: 1 if the resource is available to the user making the query,
1519: 0 otherwise.
1520:
1521: =cut
1522:
1523: ######################################################################
1524: ######################################################################
1525: sub copyright_check {
1526: my $Metadata = shift;
1527: # Check copyright tags and skip results the user cannot use
1528: my (undef,undef,$resdom,$resname) = split('/',
1529: $Metadata->{'url'});
1530: # Check for priv
1531: if (($Metadata->{'copyright'} eq 'priv') &&
1532: (($ENV{'user.name'} ne $resname) &&
1533: ($ENV{'user.domain'} ne $resdom))) {
1534: return 0;
1535: }
1536: # Check for domain
1537: if (($Metadata->{'copyright'} eq 'domain') &&
1538: ($ENV{'user.domain'} ne $resdom)) {
1539: return 0;
1540: }
1541: return 1;
1542: }
1543:
1544: ######################################################################
1545: ######################################################################
1546:
1547: =pod
1548:
1549: =item &ensure_db_and_table()
1550:
1551: Ensure we can get lonmysql to connect to the database and the table we
1552: need exists.
1553:
1554: Inputs: $r, table id
1555:
1556: Returns: undef on error, 1 if the table exists.
1557:
1558: =cut
1559:
1560: ######################################################################
1561: ######################################################################
1562: sub ensure_db_and_table {
1563: my ($r,$table) = @_;
1564: ##
1565: ## Sanity check the table id.
1566: ##
1567: if (! defined($table) || $table eq '' || $table =~ /\D/ ) {
1568: $r->print("Unable to retrieve search results. ".
1569: "Unable to determine the table results were stored in. ".
1570: "</body></html>");
1571: return undef;
1572: }
1573: ##
1574: ## Make sure we can connect and the table exists.
1575: ##
1576: my $connection_result = &Apache::lonmysql::connect_to_db();
1577: if (!defined($connection_result)) {
1578: $r->print("Unable to connect to the MySQL database where your results".
1579: " are stored. </body></html>");
1580: &Apache::lonnet::logthis("lonsearchcat: unable to get lonmysql to".
1581: " connect to database.");
1582: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
1583: return undef;
1584: }
1585: my $table_check = &Apache::lonmysql::check_table($table);
1586: if (! defined($table_check)) {
1587: $r->print("A MySQL error has occurred.</form></body></html>");
1588: &Apache::lonnet::logthis("lonmysql was unable to determine the status".
1589: " of table ".$table);
1590: return undef;
1591: } elsif (! $table_check) {
1592: $r->print("The table of results could not be found.");
1593: &Apache::lonnet::logthis("The user requested a table, ".$table.
1594: ", that could not be found.");
1595: return undef;
1596: }
1597: return 1;
1598: }
1599:
1600: ######################################################################
1601: ######################################################################
1602:
1603: =pod
1604:
1605: =item &print_sort_form()
1606:
1607: The sort feature is not implemented at this time. This form just prints
1608: a link to change the search query.
1609:
1610: =cut
1611:
1612: ######################################################################
1613: ######################################################################
1614: sub print_sort_form {
1615: my ($r,$pretty_query_string) = @_;
1616: my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
1617: ##
1618: my %SortableFields=&Apache::lonlocal::texthash(
1619: id => 'Default',
1620: title => 'Title',
1621: author => 'Author',
1622: subject => 'Subject',
1623: url => 'URL',
1624: version => 'Version Number',
1625: mime => 'Mime type',
1626: lang => 'Language',
1627: owner => 'Owner/Publisher',
1628: copyright => 'Copyright',
1629: hostname => 'Host',
1630: creationdate => 'Creation Date',
1631: lastrevisiondate => 'Revision Date'
1632: );
1633: ##
1634: my $table = $ENV{'form.table'};
1635: return if (! &ensure_db_and_table($r,$table));
1636: ##
1637: ## Get the number of results
1638: ##
1639: my $total_results = &Apache::lonmysql::number_of_rows($table);
1640: if (! defined($total_results)) {
1641: $r->print("A MySQL error has occurred.</form></body></html>");
1642: &Apache::lonnet::logthis("lonmysql was unable to determine the number".
1643: " of rows in table ".$table);
1644: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
1645: return;
1646: }
1647: my $result;
1648: $result.=<<END;
1649: <html>
1650: <head>
1651: <script>
1652: function change_sort() {
1653: var newloc = "/adm/searchcat?phase=results";
1654: newloc += "&persistent_db_id=$ENV{'form.persistent_db_id'}";
1655: newloc += "&sortby=";
1656: newloc += document.forms.statusform.elements.sortby.value;
1657: parent.resultsframe.location= newloc;
1658: }
1659: </script>
1660: <title>Results</title>
1661: </head>
1662: $bodytag
1663: <form name="statusform" action="" method="post">
1664: <input type="hidden" name="Queue" value="" />
1665: END
1666:
1667: #<h2>Sort Results</h2>
1668: #Sort by: <select size="1" name="sortby" onchange="javascript:change_sort();">
1669: # $ENV{'form.sortby'} = 'id' if (! defined($ENV{'form.sortby'}));
1670: # foreach (keys(%SortableFields)) {
1671: # $result.="<option name=\"$_\"";
1672: # if ($_ eq $ENV{'form.sortby'}) {
1673: # $result.=" selected ";
1674: # }
1675: # $result.=" >$SortableFields{$_}</option>\n";
1676: # }
1677: # $result.="</select>\n";
1678: my $revise = &revise_button();
1679: $result.=<<END;
1680: <p>
1681: There are $total_results matches to your query. $revise
1682: </p><p>
1683: Search:$pretty_query_string
1684: </p>
1685: </form>
1686: </body>
1687: </html>
1688: END
1689: $r->print($result);
1690: return;
1691: }
1692:
1693: #####################################################################
1694: #####################################################################
1695:
1696: =pod
1697:
1698: =item MySQL Table Description
1699:
1700: MySQL table creation requires a precise description of the data to be
1701: stored. The use of the correct types to hold data is vital to efficient
1702: storage and quick retrieval of records. The columns must be described in
1703: the following format:
1704:
1705: =cut
1706:
1707: #####################################################################
1708: #####################################################################
1709: #
1710: # These should probably be scoped but I don't have time right now...
1711: #
1712: my @Datatypes;
1713: my @Fullindicies;
1714:
1715: ######################################################################
1716: ######################################################################
1717:
1718: =pod
1719:
1720: =item &create_results_table()
1721:
1722: Creates the table of search results by calling lonmysql. Stores the
1723: table id in $ENV{'form.table'}
1724:
1725: Inputs: none.
1726:
1727: Returns: the identifier of the table on success, undef on error.
1728:
1729: =cut
1730:
1731: ######################################################################
1732: ######################################################################
1733: sub set_up_table_structure {
1734: my ($datatypes,$fullindicies) =
1735: &LONCAPA::lonmetadata::describe_metadata_storage();
1736: # Copy the table description before modifying it...
1737: @Datatypes = @{$datatypes};
1738: unshift(@Datatypes,{name => 'id',
1739: type => 'MEDIUMINT',
1740: restrictions => 'UNSIGNED NOT NULL',
1741: primary_key => 'yes',
1742: auto_inc => 'yes' });
1743: @Fullindicies = @{$fullindicies};
1744: return;
1745: }
1746:
1747: sub create_results_table {
1748: &set_up_table_structure();
1749: my $table = &Apache::lonmysql::create_table
1750: ( { columns => \@Datatypes,
1751: FULLTEXT => [{'columns' => \@Fullindicies},],
1752: } );
1753: if (defined($table)) {
1754: $ENV{'form.table'} = $table;
1755: return $table;
1756: }
1757: return undef; # Error...
1758: }
1759:
1760: ######################################################################
1761: ######################################################################
1762:
1763: =pod
1764:
1765: =item Search Status update functions
1766:
1767: Each of the following functions changes the values of one of the
1768: input fields used to display the search status to the user. The names
1769: should be explanatory.
1770:
1771: Inputs: Apache request handler ($r), text to display.
1772:
1773: Returns: Nothing.
1774:
1775: =over 4
1776:
1777: =item &update_count_status()
1778:
1779: =item &update_status()
1780:
1781: =item &update_seconds()
1782:
1783: =back
1784:
1785: =cut
1786:
1787: ######################################################################
1788: ######################################################################
1789: sub update_count_status {
1790: my ($r,$text) = @_;
1791: $text =~ s/\'/\\\'/g;
1792: $r->print
1793: ("<script>document.statusform.count.value = ' $text'</script>\n");
1794: $r->rflush();
1795: }
1796:
1797: sub update_status {
1798: my ($r,$text) = @_;
1799: $text =~ s/\'/\\\'/g;
1800: $r->print
1801: ("<script>document.statusform.status.value = ' $text'</script>\n");
1802: $r->rflush();
1803: }
1804:
1805: {
1806: my $max_time = 40; # seconds for the search to complete
1807: my $start_time = 0;
1808: my $last_time = 0;
1809:
1810: sub reset_timing {
1811: $start_time = 0;
1812: $last_time = 0;
1813: }
1814:
1815: sub time_left {
1816: if ($start_time == 0) {
1817: $start_time = time;
1818: }
1819: my $time_left = $max_time - (time - $start_time);
1820: $time_left = 0 if ($time_left < 0);
1821: return $time_left;
1822: }
1823:
1824: sub update_seconds {
1825: my ($r) = @_;
1826: my $time = &time_left();
1827: if (($last_time-$time) > 0) {
1828: $r->print("<script>".
1829: "document.statusform.seconds.value = '$time'".
1830: "</script>\n");
1831: $r->rflush();
1832: }
1833: $last_time = $time;
1834: }
1835:
1836: }
1837:
1838: ######################################################################
1839: ######################################################################
1840:
1841: =pod
1842:
1843: =item &revise_button()
1844:
1845: Inputs: None
1846:
1847: Returns: html string for a 'revise search' button.
1848:
1849: =cut
1850:
1851: ######################################################################
1852: ######################################################################
1853: sub revise_button {
1854: my $revise_phase = 'disp_basic';
1855: $revise_phase = 'disp_adv' if ($ENV{'form.searchmode'} eq 'advanced');
1856: my $newloc = '/adm/searchcat'.
1857: '?persistent_db_id='.$ENV{'form.persistent_db_id'}.
1858: '&cleargroupsort=1'.
1859: '&phase='.$revise_phase;
1860: my $result = qq{<input type="button" value="Revise search" name="revise"} .
1861: qq{ onClick="parent.location='$newloc';" /> };
1862: return $result;
1863: }
1864:
1865: ######################################################################
1866: ######################################################################
1867:
1868: =pod
1869:
1870: =item &run_search()
1871:
1872: Executes a search query by sending it the the other servers and putting the
1873: results into MySQL.
1874:
1875: =cut
1876:
1877: ######################################################################
1878: ######################################################################
1879: sub run_search {
1880: my ($r,$query,$customquery,$customshow,$serverlist,$pretty_string) = @_;
1881: my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
1882: my $connection = $r->connection;
1883: #
1884: # Print run_search header
1885: #
1886: $r->print(<<END);
1887: <html>
1888: <head><title>Search Status</title></head>
1889: $bodytag
1890: <form name="statusform" action="" method="post">
1891: <input type="hidden" name="Queue" value="" />
1892: END
1893: # Check to see if $pretty_string has more than one carriage return.
1894: # Assume \n s are following <br /> s and truncate the value.
1895: # (there is probably a better way)...
1896: my @Lines = split /<br \/>/,$pretty_string;
1897: if (@Lines > 2) {
1898: $pretty_string = join '<br \>',(@Lines[0..2],'....<br />');
1899: }
1900: $r->print(&mt("Search: [_1]",$pretty_string));
1901: $r->rflush();
1902: #
1903: # Determine the servers we need to contact.
1904: my @Servers_to_contact;
1905: if (defined($serverlist)) {
1906: if (ref($serverlist) eq 'ARRAY') {
1907: @Servers_to_contact = @$serverlist;
1908: } else {
1909: @Servers_to_contact = ($serverlist);
1910: }
1911: } else {
1912: @Servers_to_contact = sort(keys(%Apache::lonnet::libserv));
1913: }
1914: my %Server_status;
1915: #
1916: # Check on the mysql table we will use to store results.
1917: my $table =$ENV{'form.table'};
1918: if (! defined($table) || $table eq '' || $table =~ /\D/ ) {
1919: $r->print("Unable to determine table id to store search results in.".
1920: "The search has been aborted.</body></html>");
1921: return;
1922: }
1923: my $table_status = &Apache::lonmysql::check_table($table);
1924: if (! defined($table_status)) {
1925: $r->print("Unable to determine status of table.</body></html>");
1926: &Apache::lonnet::logthis("Bogus table id of $table for ".
1927: "$ENV{'user.name'} @ $ENV{'user.domain'}");
1928: &Apache::lonnet::logthis("lonmysql error = ".
1929: &Apache::lonmysql::get_error());
1930: return;
1931: }
1932: if (! $table_status) {
1933: &Apache::lonnet::logthis("lonmysql error = ".
1934: &Apache::lonmysql::get_error());
1935: &Apache::lonnet::logthis("lonmysql debug = ".
1936: &Apache::lonmysql::get_debug());
1937: &Apache::lonnet::logthis('table status = "'.$table_status.'"');
1938: $r->print("The table id,$table, we tried to use is invalid.".
1939: "The search has been aborted.</body></html>");
1940: return;
1941: }
1942: ##
1943: ## Prepare for the big loop.
1944: my $hitcountsum;
1945: my $server;
1946: my $status;
1947: my $revise = &revise_button();
1948: $r->print(<<END);
1949: <table>
1950: <tr><th>Status</th><th>Total Matches</th><th>Time Remaining</th><th></th></tr>
1951: <tr>
1952: <td><input type="text" name="status" value="" size="30" /></td>
1953: <td><input type="text" name="count" value="" size="10" /></td>
1954: <td><input type="text" name="seconds" value="" size="8" /></td>
1955: <td>$revise</td>
1956: </tr>
1957: </table>
1958: </form>
1959: END
1960: $r->rflush();
1961: &reset_timing();
1962: &update_seconds($r);
1963: &update_status($r,&mt('contacting [_1]',$Servers_to_contact[0]));
1964: while (&time_left() &&
1965: ((@Servers_to_contact) || keys(%Server_status))) {
1966: &update_seconds($r);
1967: #
1968: # Send out a search request
1969: if (@Servers_to_contact) {
1970: # Contact one server
1971: my $server = shift(@Servers_to_contact);
1972: &update_status($r,&mt('contacting [_1]',$server));
1973: my $reply=&Apache::lonnet::metadata_query($query,$customquery,
1974: $customshow,[$server]);
1975: ($server) = keys(%$reply);
1976: $Server_status{$server} = $reply->{$server};
1977: } else {
1978: # wait a sec. to give time for files to be written
1979: # This sleep statement is here instead of outside the else
1980: # block because we do not want to pause if we have servers
1981: # left to contact.
1982: if (scalar (keys(%Server_status))) {
1983: &update_status($r,
1984: &mt('waiting on [_1]',join(' ',keys(%Server_status))));
1985: }
1986: sleep(1);
1987: }
1988: #
1989: # Loop through the servers we have contacted but do not
1990: # have results from yet, looking for results.
1991: while (my ($server,$status) = each(%Server_status)) {
1992: last if ($connection->aborted());
1993: &update_seconds($r);
1994: if ($status eq 'con_lost') {
1995: delete ($Server_status{$server});
1996: next;
1997: }
1998: $status=~/^([\.\w]+)$/;
1999: my $datafile=$r->dir_config('lonDaemons').'/tmp/'.$1;
2000: if (-e $datafile && ! -e "$datafile.end") {
2001: &update_status($r,&mt('Receiving results from [_1]',$server));
2002: next;
2003: }
2004: last if ($connection->aborted());
2005: if (-e "$datafile.end") {
2006: &update_status($r,&mt('Reading results from [_1]',$server));
2007: if (-z "$datafile") {
2008: delete($Server_status{$server});
2009: next;
2010: }
2011: my $fh;
2012: if (!($fh=Apache::File->new($datafile))) {
2013: $r->print("Unable to open search results file for ".
2014: "server $server. Omitting from search");
2015: delete($Server_status{$server});
2016: next;
2017: }
2018: # Read in the whole file.
2019: while (my $result = <$fh>) {
2020: last if ($connection->aborted());
2021: #
2022: # Records are stored one per line
2023: chomp($result);
2024: next if (! $result);
2025: #
2026: # Parse the result.
2027: my %Fields = &parse_raw_result($result,$server);
2028: $Fields{'hostname'} = $server;
2029: #
2030: # Skip based on copyright
2031: next if (! ©right_check(\%Fields));
2032: #
2033: # Store the result in the mysql database
2034: my $result = &Apache::lonmysql::store_row($table,\%Fields);
2035: if (! defined($result)) {
2036: $r->print(&Apache::lonmysql::get_error());
2037: }
2038: #
2039: $hitcountsum ++;
2040: &update_seconds($r);
2041: if ($hitcountsum % 50 == 0) {
2042: &update_count_status($r,$hitcountsum);
2043: }
2044: }
2045: $fh->close();
2046: # $server is only deleted if the results file has been
2047: # found and (successfully) opened. This may be a bad idea.
2048: delete($Server_status{$server});
2049: }
2050: last if ($connection->aborted());
2051: &update_count_status($r,$hitcountsum);
2052: }
2053: last if ($connection->aborted());
2054: &update_seconds($r);
2055: }
2056: &update_status($r,&mt('Search Complete [_1]',$server));
2057: &update_seconds($r);
2058: #
2059: &Apache::lonmysql::disconnect_from_db(); # This is unneccessary
2060: #
2061: # We have run out of time or run out of servers to talk to and
2062: # results to get, so let the client know the top frame needs to be
2063: # loaded from /adm/searchcat
2064: $r->print("</body></html>");
2065: if ($ENV{'form.catalogmode'} ne 'groupsearch') {
2066: $r->print("<script>".
2067: "window.location='/adm/searchcat?".
2068: "phase=sort&".
2069: "persistent_db_id=$ENV{'form.persistent_db_id'}';".
2070: "</script>");
2071: }
2072: return;
2073: }
2074:
2075: ######################################################################
2076: ######################################################################
2077:
2078: =pod
2079:
2080: =item &prev_next_buttons()
2081:
2082: Returns html for the previous and next buttons on the search results page.
2083:
2084: =cut
2085:
2086: ######################################################################
2087: ######################################################################
2088: sub prev_next_buttons {
2089: my ($current_min,$show,$total,$parms) = @_;
2090: return '' if ($show eq 'all'); # No links if you get them all at once.
2091: #
2092: # Create links
2093: my $prev_min = $current_min - $show;
2094: $prev_min = 1 if $prev_min < 1;
2095: my $prevlink =
2096: qq{<a href="/adm/searchcat?$parms&start=$prev_min&show=$show">};
2097: #
2098: my $next_min = $current_min + $show;
2099: $next_min = $current_min if ($next_min > $total);
2100: my $nextlink =
2101: qq{<a href="/adm/searchcat?$parms&start=$next_min&show=$show">};
2102: my $reloadlink =
2103: qq{<a href="/adm/searchcat?$parms&start=$current_min&$show=$show">};
2104: #
2105: # Determine which parameters to pass
2106: my $String = '[_1]prev[_2] [_3]reload[_4] [_5]next[_6]';
2107: if ($prev_min == $current_min) {
2108: $String =~ s:\[_[12]\]::g;
2109: }
2110: if ($next_min == $current_min) {
2111: $String =~ s:\[_[56]\]::g;
2112: }
2113: my $links = &mt($String,
2114: $prevlink, '</a>',
2115: $reloadlink,'</a>',
2116: $nextlink, '</a>');
2117: return $links;
2118: }
2119:
2120: ######################################################################
2121: ######################################################################
2122:
2123: =pod
2124:
2125: =item &display_results()
2126:
2127: Prints the results out for selection and perusal.
2128:
2129: =cut
2130:
2131: ######################################################################
2132: ######################################################################
2133: sub display_results {
2134: my ($r,$importbutton,$closebutton,$diropendb) = @_;
2135: my $connection = $r->connection;
2136: $r->print(&search_results_header($importbutton,$closebutton));
2137: ##
2138: ## Set viewing function
2139: ##
2140: my $viewfunction = $Views{$ENV{'form.viewselect'}};
2141: if (!defined($viewfunction)) {
2142: $r->print("Internal Error - Bad view selected.\n");
2143: $r->rflush();
2144: return;
2145: }
2146: ##
2147: ## $checkbox_num is a count of the number of checkboxes output on the
2148: ## page this is used only during catalogmode=groupsearch.
2149: my $checkbox_num = 0;
2150: ##
2151: ## Get the catalog controls setup
2152: ##
2153: my $action = "/adm/searchcat?phase=results";
2154: ##
2155: ## Deal with groupsearch by opening the groupsearch db file.
2156: if ($ENV{'form.catalogmode'} eq 'groupsearch') {
2157: if (! tie(%groupsearch_db,'GDBM_File',$diropendb,
2158: &GDBM_WRCREAT(),0640)) {
2159: $r->print('Unable to store import results.</form></body></html>');
2160: $r->rflush();
2161: return;
2162: }
2163: }
2164: ##
2165: ## Prepare the table for querying
2166: my $table = $ENV{'form.table'};
2167: return if (! &ensure_db_and_table($r,$table));
2168: ##
2169: ## Get the number of results
2170: my $total_results = &Apache::lonmysql::number_of_rows($table);
2171: if (! defined($total_results)) {
2172: $r->print("A MySQL error has occurred.</form></body></html>");
2173: &Apache::lonnet::logthis("lonmysql was unable to determine the number".
2174: " of rows in table ".$table);
2175: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
2176: return;
2177: }
2178: ##
2179: ## Determine how many results we need to get
2180: $ENV{'form.start'} = 1 if (! exists($ENV{'form.start'}));
2181: $ENV{'form.show'} = 'all' if (! exists($ENV{'form.show'}));
2182: my $min = $ENV{'form.start'};
2183: my $max;
2184: if ($ENV{'form.show'} eq 'all') {
2185: $max = $total_results ;
2186: } else {
2187: $max = $min + $ENV{'form.show'} - 1;
2188: $max = $total_results if ($max > $total_results);
2189: }
2190: ##
2191: ## Output links (if necessary) for 'prev' and 'next' pages.
2192: $r->print
2193: ('<center>'.
2194: &prev_next_buttons($min,$ENV{'form.show'},$total_results,
2195: "table=".$ENV{'form.table'}.
2196: "&phase=results".
2197: "&persistent_db_id=".$ENV{'form.persistent_db_id'})
2198: ."</center>\n"
2199: );
2200: if ($total_results == 0) {
2201: $r->print('<meta HTTP-EQUIV="Refresh" CONTENT="2">'.
2202: '<h3>'.&mt('There are currently no results').'.</h3>'.
2203: "</form></body></html>");
2204: return;
2205: } else {
2206: $r->print
2207: ("<center>Results $min to $max out of $total_results</center>\n");
2208: }
2209: ##
2210: ## Get results from MySQL table
2211: my @Results = &Apache::lonmysql::get_rows($table,
2212: 'id>='.$min.' AND id<='.$max);
2213: ##
2214: ## Loop through the results and output them.
2215: foreach my $row (@Results) {
2216: if ($connection->aborted()) {
2217: &cleanup();
2218: return;
2219: }
2220: my %Fields = %{&parse_row(@$row)};
2221: my $output="<p>\n";
2222: if (! defined($Fields{'title'}) || $Fields{'title'} eq '') {
2223: $Fields{'title'} = 'Untitled';
2224: }
2225: my $prefix=&catalogmode_output($Fields{'title'},$Fields{'url'},
2226: $Fields{'id'},$checkbox_num++);
2227: # Render the result into html
2228: $output.= &$viewfunction($prefix,%Fields);
2229: # Print them out as they come in.
2230: $r->print($output);
2231: $r->rflush();
2232: }
2233: if (@Results < 1) {
2234: $r->print(&mt("There were no results matching your query"));
2235: } else {
2236: $r->print
2237: ('<center>'.
2238: &prev_next_buttons($min,$ENV{'form.show'},$total_results,
2239: "table=".$ENV{'form.table'}.
2240: "&phase=results".
2241: "&persistent_db_id=".
2242: $ENV{'form.persistent_db_id'})
2243: ."</center>\n"
2244: );
2245: }
2246: $r->print("</form></body></html>");
2247: $r->rflush();
2248: untie %groupsearch_db if (tied(%groupsearch_db));
2249: return;
2250: }
2251:
2252: ######################################################################
2253: ######################################################################
2254:
2255: =pod
2256:
2257: =item &catalogmode_output($title,$url,$fnum,$checkbox_num)
2258:
2259: Returns html needed for the various catalog modes. Gets inputs from
2260: $ENV{'form.catalogmode'}. Stores data in %groupsearch_db.
2261:
2262: =cut
2263:
2264: ######################################################################
2265: ######################################################################
2266: sub catalogmode_output {
2267: my $output = '';
2268: my ($title,$url,$fnum,$checkbox_num) = @_;
2269: if ($ENV{'form.catalogmode'} eq 'interactive') {
2270: $title=~ s/\'/\\\'/g;
2271: if ($ENV{'form.catalogmode'} eq 'interactive') {
2272: $output.=<<END
2273: <font size='-1'><INPUT TYPE="button" NAME="returnvalues" VALUE="SELECT"
2274: onClick="javascript:select_data('$title','$url')">
2275: </font>
2276: END
2277: }
2278: } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') {
2279: $groupsearch_db{"pre_${fnum}_link"}=$url;
2280: $groupsearch_db{"pre_${fnum}_title"}=$title;
2281: $output.=<<END;
2282: <font size='-1'>
2283: <input type="checkbox" name="returnvalues" value="SELECT"
2284: onClick="javascript:queue($checkbox_num,$fnum)" />
2285: </font>
2286: END
2287: }
2288: return $output;
2289: }
2290: ######################################################################
2291: ######################################################################
2292:
2293: =pod
2294:
2295: =item &parse_row()
2296:
2297: Parse a row returned from the database.
2298:
2299: =cut
2300:
2301: ######################################################################
2302: ######################################################################
2303: sub parse_row {
2304: my @Row = @_;
2305: my %Fields;
2306: if (! scalar(@Datatypes)) {
2307: &set_up_table_structure();
2308: }
2309: for (my $i=0;$i<=$#Row;$i++) {
2310: $Fields{$Datatypes[$i]->{'name'}}=&Apache::lonnet::unescape($Row[$i]);
2311: }
2312: $Fields{'language'} =
2313: &Apache::loncommon::languagedescription($Fields{'language'});
2314: $Fields{'copyrighttag'} =
2315: &Apache::loncommon::copyrightdescription($Fields{'copyright'});
2316: $Fields{'mimetag'} =
2317: &Apache::loncommon::filedescription($Fields{'mime'});
2318: return \%Fields;
2319: }
2320:
2321: ###########################################################
2322: ###########################################################
2323:
2324: =pod
2325:
2326: =item &parse_raw_result()
2327:
2328: Takes a line from the file of results and parse it. Returns a hash
2329: with keys according to column labels
2330:
2331: In addition, the following tags are set by calling the appropriate
2332: lonnet function: 'language', 'copyrighttag', 'mimetag'.
2333:
2334: The 'title' field is set to "Untitled" if the title field is blank.
2335:
2336: 'abstract' and 'keywords' are truncated to 200 characters.
2337:
2338: =cut
2339:
2340: ###########################################################
2341: ###########################################################
2342: sub parse_raw_result {
2343: my ($result,$hostname) = @_;
2344: # conclude from self to others regarding fields
2345: my %Fields=&LONCAPA::lonmetadata::metadata_col_to_hash
2346: (map {
2347: &Apache::lonnet::unescape($_);
2348: } (split(/\,/,$result)) );
2349: return %Fields;
2350: }
2351:
2352: ###########################################################
2353: ###########################################################
2354:
2355: =pod
2356:
2357: =item &handle_custom_fields()
2358:
2359: =cut
2360:
2361: ###########################################################
2362: ###########################################################
2363: sub handle_custom_fields {
2364: my @results = @{shift()};
2365: my $customshow='';
2366: my $extrashow='';
2367: my @customfields;
2368: if ($ENV{'form.customshow'}) {
2369: $customshow=$ENV{'form.customshow'};
2370: $customshow=~s/[^\w\s]//g;
2371: my @fields=map {
2372: "<font color=\"#008000\">$_:</font><!-- $_ -->";
2373: } split(/\s+/,$customshow);
2374: @customfields=split(/\s+/,$customshow);
2375: if ($customshow) {
2376: $extrashow="<ul><li>".join("</li><li>",@fields)."</li></ul>\n";
2377: }
2378: }
2379: my $customdata='';
2380: my %customhash;
2381: foreach my $result (@results) {
2382: if ($result=~/^(custom\=.*)$/) { # grab all custom metadata
2383: my $tmp=$result;
2384: $tmp=~s/^custom\=//;
2385: my ($k,$v)=map {&Apache::lonnet::unescape($_);
2386: } split(/\,/,$tmp);
2387: $customhash{$k}=$v;
2388: }
2389: }
2390: return ($extrashow,\@customfields,\%customhash);
2391: }
2392:
2393: ######################################################################
2394: ######################################################################
2395:
2396: =pod
2397:
2398: =item &search_results_header()
2399:
2400: Output the proper html headers and javascript code to deal with different
2401: calling modes.
2402:
2403: Takes most inputs directly from %ENV, except $mode.
2404:
2405: =over 4
2406:
2407: =item $mode is either (at this writing) 'Basic' or 'Advanced'
2408:
2409: =back
2410:
2411: The following environment variables are checked:
2412:
2413: =over 4
2414:
2415: =item 'form.catalogmode'
2416:
2417: Checked for 'interactive' and 'groupsearch'.
2418:
2419: =item 'form.mode'
2420:
2421: Checked for existance & 'edit' mode.
2422:
2423: =item 'form.form'
2424:
2425: Contains the name of the form that has the input fields to set
2426:
2427: =item 'form.element'
2428:
2429: the name of the input field to put the URL into
2430:
2431: =item 'form.titleelement'
2432:
2433: the name of the input field to put the title into
2434:
2435: =back
2436:
2437: =cut
2438:
2439: ######################################################################
2440: ######################################################################
2441: sub search_results_header {
2442: my ($importbutton,$closebutton) = @_;
2443: my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
2444: my $result = '';
2445: # output beginning of search page
2446: # conditional output of script functions dependent on the mode in
2447: # which the search was invoked
2448: if ($ENV{'form.catalogmode'} eq 'interactive'){
2449: if (! exists($ENV{'form.mode'}) || $ENV{'form.mode'} ne 'edit') {
2450: $result.=<<SCRIPT;
2451: <script type="text/javascript">
2452: function select_data(title,url) {
2453: changeTitle(title);
2454: changeURL(url);
2455: parent.close();
2456: }
2457: function changeTitle(val) {
2458: if (parent.opener.inf.document.forms.resinfo.elements.t) {
2459: parent.opener.inf.document.forms.resinfo.elements.t.value=val;
2460: }
2461: }
2462: function changeURL(val) {
2463: if (parent.opener.inf.document.forms.resinfo.elements.u) {
2464: parent.opener.inf.document.forms.resinfo.elements.u.value=val;
2465: }
2466: }
2467: </script>
2468: SCRIPT
2469: } elsif ($ENV{'form.mode'} eq 'edit') {
2470: my $form = $ENV{'form.form'};
2471: my $element = $ENV{'form.element'};
2472: my $titleelement = $ENV{'form.titleelement'};
2473: my $changetitle;
2474: if (!$titleelement) {
2475: $changetitle='function changeTitle(val) {}';
2476: } else {
2477: $changetitle=<<END;
2478: function changeTitle(val) {
2479: if (parent.targetwin.document) {
2480: parent.targetwin.document.forms["$form"].elements["$titleelement"].value=val;
2481: } else {
2482: var url = 'forms[\"$form\"].elements[\"$titleelement\"].value';
2483: alert("Unable to transfer data to "+url);
2484: }
2485: }
2486: END
2487: }
2488:
2489: $result.=<<SCRIPT;
2490: <script type="text/javascript">
2491: function select_data(title,url) {
2492: changeURL(url);
2493: changeTitle(title);
2494: parent.close();
2495: }
2496: $changetitle
2497: function changeURL(val) {
2498: if (parent.targetwin.document) {
2499: parent.targetwin.document.forms["$form"].elements["$element"].value=val;
2500: } else {
2501: var url = 'forms[\"$form\"].elements[\"$element\"].value';
2502: alert("Unable to transfer data to "+url);
2503: }
2504: }
2505: </script>
2506: SCRIPT
2507: }
2508: }
2509: $result.=<<SCRIPT if $ENV{'form.catalogmode'} eq 'groupsearch';
2510: <script type="text/javascript">
2511: function queue(checkbox_num,val) {
2512: if (document.forms.results.returnvalues.length != "undefined" &&
2513: typeof(document.forms.results.returnvalues.length) == "number") {
2514: if (document.forms.results.returnvalues[checkbox_num].checked) {
2515: parent.statusframe.document.forms.statusform.elements.Queue.value +='1a'+val+'b';
2516: } else {
2517: parent.statusframe.document.forms.statusform.elements.Queue.value +='0a'+val+'b';
2518: }
2519: } else {
2520: if (document.forms.results.returnvalues.checked) {
2521: parent.statusframe.document.forms.statusform.elements.Queue.value +='1a'+val+'b';
2522: } else {
2523: parent.statusframe.document.forms.statusform.elements.Queue.value +='0a'+val+'b';
2524: }
2525: }
2526: }
2527: function select_group() {
2528: parent.window.location=
2529: "/adm/groupsort?mode=$ENV{'form.mode'}&catalogmode=groupsearch&acts="+
2530: parent.statusframe.document.forms.statusform.elements.Queue.value;
2531: }
2532: </script>
2533: SCRIPT
2534: $result.=<<END;
2535: </head>
2536: $bodytag
2537: <form name="results" method="post" action="" >
2538: <input type="hidden" name="Queue" value="" />
2539: $importbutton
2540: END
2541: return $result;
2542: }
2543:
2544: ######################################################################
2545: ######################################################################
2546: sub search_status_header {
2547: my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
2548: return <<ENDSTATUS;
2549: <html><head><title>Search Status</title></head>
2550: $bodytag
2551: <h3>Search Status</h3>
2552: Sending search request to LON-CAPA servers.<br />
2553: ENDSTATUS
2554: }
2555:
2556: sub results_link {
2557: my $basic_link = "/adm/searchcat?"."&table=".$ENV{'form.table'}.
2558: "&persistent_db_id=".$ENV{'form.persistent_db_id'};
2559: my $results_link = $basic_link."&phase=results".
2560: "&pause=1"."&start=1";
2561: return $results_link;
2562: }
2563:
2564: ######################################################################
2565: ######################################################################
2566: sub print_frames_interface {
2567: my $r = shift;
2568: my $basic_link = "/adm/searchcat?"."&table=".$ENV{'form.table'}.
2569: "&persistent_db_id=".$ENV{'form.persistent_db_id'};
2570: my $run_search_link = $basic_link."&phase=run_search";
2571: my $results_link = &results_link();
2572: my $result = <<"ENDFRAMES";
2573: <html>
2574: <head>
2575: <script>
2576: var targetwin = opener;
2577: var queue = '';
2578: </script>
2579: <title>LON-CAPA Digital Library Search Results</title>
2580: </head>
2581: <frameset rows="150,*">
2582: <frame name="statusframe" src="$run_search_link">
2583: <frame name="resultsframe" src="$results_link">
2584: </frameset>
2585: </html>
2586: ENDFRAMES
2587:
2588: $r->print($result);
2589: return;
2590: }
2591:
2592: ######################################################################
2593: ######################################################################
2594:
2595: =pod
2596:
2597: =item Metadata Viewing Functions
2598:
2599: Output is a HTML-ified string.
2600:
2601: Input arguments are title, author, subject, url, keywords, version,
2602: notes, short abstract, mime, language, creation date,
2603: last revision date, owner, copyright, hostname, and
2604: extra custom metadata to show.
2605:
2606: =over 4
2607:
2608: =item &detailed_citation_view()
2609:
2610: =cut
2611:
2612: ######################################################################
2613: ######################################################################
2614: sub detailed_citation_view {
2615: my ($prefix,%values) = @_;
2616: my $icon=&Apache::loncommon::icon($values{'url'});
2617: my $result=<<END;
2618: <b>$prefix<img src="$icon" /><a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2619: target='search_preview'>$values{'title'}</a></b>
2620: <p>
2621: <b>$values{'author'}</b>, <i>$values{'owner'}</i><br />
2622:
2623: <b>Subject: </b> $values{'subject'}<br />
2624: <b>Keyword(s): </b> $values{'keywords'}<br />
2625: <b>Notes: </b> $values{'notes'}<br />
2626: <b>MIME Type: </b> $values{'mimetag'}<br />
2627: <b>Language: </b> $values{'language'}<br />
2628: <b>Copyright/Distribution:</b> $values{'copyrighttag'}<br />
2629: </p>
2630: $values{'extrashow'}
2631: <p>
2632: $values{'shortabstract'}
2633: </p>
2634: <hr align='left' width='200' noshade />
2635: END
2636: return $result;
2637: }
2638:
2639: ######################################################################
2640: ######################################################################
2641:
2642: =pod
2643:
2644: =item &summary_view()
2645:
2646: =cut
2647: ######################################################################
2648: ######################################################################
2649: sub summary_view {
2650: my ($prefix,%values) = @_;
2651: my $icon=&Apache::loncommon::icon($values{'url'});
2652: my $result=<<END;
2653: $prefix<img src="$icon" /><a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2654: target='search_preview'>$values{'author'}</a><br />
2655: $values{'title'}<br />
2656: $values{'owner'} -- $values{'lastrevisiondate'}<br />
2657: $values{'copyrighttag'}<br />
2658: $values{'extrashow'}
2659: </p>
2660: <hr align='left' width='200' noshade />
2661: END
2662: return $result;
2663: }
2664:
2665: ######################################################################
2666: ######################################################################
2667:
2668: =pod
2669:
2670: =item &compact_view()
2671:
2672: =cut
2673:
2674: ######################################################################
2675: ######################################################################
2676: sub compact_view {
2677: my ($prefix,%values) = @_;
2678: my $icon=&Apache::loncommon::icon($values{'url'});
2679: my $result=<<END;
2680: $prefix <img src="$icon" /> <a href="http://$ENV{'HTTP_HOST'}$values{'url'}" target='search_preview'>
2681: $values{'title'}</a>
2682: <b>$values{'author'}</b><br />
2683: END
2684: return $result;
2685: }
2686:
2687:
2688: ######################################################################
2689: ######################################################################
2690:
2691: =pod
2692:
2693: =item &fielded_format_view()
2694:
2695: =cut
2696:
2697: ######################################################################
2698: ######################################################################
2699: sub fielded_format_view {
2700: my ($prefix,%values) = @_;
2701: my $icon=&Apache::loncommon::icon($values{'url'});
2702: my $result=<<END;
2703: $prefix <img src="$icon" />
2704: <b>URL: </b> <a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2705: target='search_preview'>$values{'url'}</a>
2706: <br />
2707: <b>Title:</b> $values{'title'}<br />
2708: <b>Author(s):</b> $values{'author'}<br />
2709: <b>Subject:</b> $values{'subject'}<br />
2710: <b>Keyword(s):</b> $values{'keywords'}<br />
2711: <b>Notes:</b> $values{'notes'}<br />
2712: <b>MIME Type:</b> $values{'mimetag'}<br />
2713: <b>Language:</b> $values{'language'}<br />
2714: <b>Creation Date:</b> $values{'creationdate'}<br />
2715: <b>Last Revision Date:</b> $values{'lastrevisiondate'}<br />
2716: <b>Publisher/Owner:</b> $values{'owner'}<br />
2717: <b>Copyright/Distribution:</b> $values{'copyrighttag'}<br />
2718: <b>Repository Location:</b> $values{'hostname'}<br />
2719: <b>Abstract:</b> $values{'shortabstract'}<br />
2720: $values{'extrashow'}
2721: </p>
2722: <hr align='left' width='200' noshade />
2723: END
2724: return $result;
2725: }
2726:
2727: ######################################################################
2728: ######################################################################
2729:
2730: =pod
2731:
2732: =item &xml_sgml_view()
2733:
2734: =back
2735:
2736: =cut
2737:
2738: ######################################################################
2739: ######################################################################
2740: sub xml_sgml_view {
2741: my ($prefix,%values) = @_;
2742: my $xml = <<END;
2743: <LonCapaResource>
2744: <url>$values{'url'}</url>
2745: <title>$values{'title'}</title>
2746: <author>$values{'author'}</author>
2747: <subject>$values{'subject'}</subject>
2748: <keywords>$values{'keywords'}</keywords>
2749: <notes>$values{'notes'}</notes>
2750: <mimeInfo>
2751: <mime>$values{'mime'}</mime>
2752: <mimetag>$values{'mimetag'}</mimetag>
2753: </mimeInfo>
2754: <languageInfo>
2755: <language>$values{'language'}</language>
2756: <languagetag>$values{'languagetag'}</languagetag>
2757: </languageInfo>
2758: <creationdate>$values{'creationdate'}</creationdate>
2759: <lastrevisiondate>$values{'lastrevisiondate'}</lastrevisiondate>
2760: <owner>$values{'owner'}</owner>
2761: <copyrightInfo>
2762: <copyright>$values{'copyright'}</copyright>
2763: <copyrighttag>$values{'copyrighttag'}</copyrighttag>
2764: </copyrightInfo>
2765: <repositoryLocation>$values{'hostname'}</repositoryLocation>
2766: <shortabstract>$values{'shortabstract'}</shortabstract>
2767: </LonCapaResource>
2768: END
2769: $xml = &HTML::Entities::encode($xml,'<>&');
2770: my $result=<<END;
2771: $prefix
2772: <pre>
2773: $xml
2774: </pre>
2775: $values{'extrashow'}
2776: <hr align='left' width='200' noshade />
2777: END
2778: return $result;
2779: }
2780:
2781: ######################################################################
2782: ######################################################################
2783:
2784: =pod
2785:
2786: =item &filled() see if field is filled.
2787:
2788: =cut
2789:
2790: ######################################################################
2791: ######################################################################
2792: sub filled {
2793: my ($field)=@_;
2794: if ($field=~/\S/ && $field ne 'any') {
2795: return 1;
2796: } else {
2797: return 0;
2798: }
2799: }
2800:
2801: ######################################################################
2802: ######################################################################
2803:
2804: =pod
2805:
2806: =item &output_blank_field_error()
2807:
2808: Output a complete page that indicates the user has not filled in enough
2809: information to do a search.
2810:
2811: Inputs: $r (Apache request handle), $closebutton, $parms.
2812:
2813: Returns: nothing
2814:
2815: $parms is extra information to include in the 'Revise search request' link.
2816:
2817: =cut
2818:
2819: ######################################################################
2820: ######################################################################
2821: sub output_blank_field_error {
2822: my ($r,$closebutton,$parms,$hidden_fields)=@_;
2823: my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
2824: # make query information persistent to allow for subsequent revision
2825: $r->print(<<BEGINNING);
2826: <html>
2827: <head>
2828: <title>The LearningOnline Network with CAPA</title>
2829: BEGINNING
2830: $r->print(<<RESULTS);
2831: </head>
2832: $bodytag
2833: <img align='right' src='/adm/lonIcons/lonlogos.gif' />
2834: <h1>Search Catalog</h1>
2835: <form method="post" action="/adm/searchcat">
2836: $hidden_fields
2837: <a href="/adm/searchcat?$parms&persistent_db_id=$ENV{'form.persistent_db_id'}"
2838: >Revise search request</a>
2839: $closebutton
2840: <hr />
2841: <h3>Unactionable search query.</h3>
2842: <p>
2843: You did not fill in enough information for the search to be started.
2844: You need to fill in relevant fields on the search page in order
2845: for a query to be processed.
2846: </p>
2847: </body>
2848: </html>
2849: RESULTS
2850: }
2851:
2852: ######################################################################
2853: ######################################################################
2854:
2855: =pod
2856:
2857: =item &output_date_error()
2858:
2859: Output a full html page with an error message.
2860:
2861: Inputs:
2862:
2863: $r, the request pointer.
2864: $message, the error message for the user.
2865: $closebutton, the specialized close button needed for groupsearch.
2866:
2867: =cut
2868:
2869: ######################################################################
2870: ######################################################################
2871: sub output_date_error {
2872: my ($r,$message,$closebutton,$hidden_fields)=@_;
2873: # make query information persistent to allow for subsequent revision
2874: my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
2875: $r->print(<<RESULTS);
2876: <html>
2877: <head>
2878: <title>The LearningOnline Network with CAPA</title>
2879: </head>
2880: $bodytag
2881: <img align='right' src='/adm/lonIcons/lonlogos.gif' />
2882: <h1>Search Catalog</h1>
2883: <form method="post" action="/adm/searchcat">
2884: $hidden_fields
2885: <input type='button' value='Revise search request'
2886: onClick='this.form.submit();' />
2887: $closebutton
2888: <hr />
2889: <h3>Error</h3>
2890: <p>
2891: $message
2892: </p>
2893: </body>
2894: </html>
2895: RESULTS
2896: }
2897:
2898: ######################################################################
2899: ######################################################################
2900:
2901: =pod
2902:
2903: =item &start_fresh_session()
2904:
2905: Cleans the global %groupsearch_db by removing all fields which begin with
2906: 'pre_' or 'store'.
2907:
2908: =cut
2909:
2910: ######################################################################
2911: ######################################################################
2912: sub start_fresh_session {
2913: delete $groupsearch_db{'mode_catalog'};
2914: foreach (keys %groupsearch_db) {
2915: if ($_ =~ /^pre_/) {
2916: delete $groupsearch_db{$_};
2917: }
2918: if ($_ =~ /^store/) {
2919: delete $groupsearch_db{$_};
2920: }
2921: }
2922: }
2923:
2924: 1;
2925:
2926: sub cleanup {
2927: if (tied(%groupsearch_db)) {
2928: unless (untie(%groupsearch_db)) {
2929: &Apache::lonnet::logthis('Failed cleanup searchcat: groupsearch_db');
2930: }
2931: }
2932: &untiehash();
2933: &Apache::lonmysql::disconnect_from_db();
2934: }
2935:
2936: __END__
2937:
2938: =pod
2939:
2940: =back
2941:
2942: =cut
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