1: # The LearningOnline Network with CAPA
2: # Search Catalog
3: #
4: # $Id: lonsearchcat.pm,v 1.153.2.1 2002/09/16 13:05:54 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 seperate window.
52:
53: =head1 Internals
54:
55: =over 4
56:
57: =cut
58:
59: ###############################################################################
60: ###############################################################################
61:
62: ###############################################################################
63: ## ##
64: ## ORGANIZATION OF THIS PERL MODULE ##
65: ## ##
66: ## 1. Modules used by this module ##
67: ## 2. Variables used throughout the module ##
68: ## 3. handler subroutine called via Apache and mod_perl ##
69: ## 4. Other subroutines ##
70: ## ##
71: ###############################################################################
72:
73: package Apache::lonsearchcat;
74:
75: # ------------------------------------------------- modules used by this module
76: use strict;
77: use Apache::Constants qw(:common);
78: use Apache::lonnet();
79: use Apache::File();
80: use CGI qw(:standard);
81: use Text::Query;
82: use DBI;
83: use GDBM_File;
84: use Apache::loncommon();
85: use Apache::lonmysql();
86:
87: # ---------------------------------------- variables used throughout the module
88:
89: ######################################################################
90: ######################################################################
91:
92: =pod
93:
94: =item Global variables
95:
96: =over 4
97:
98: =item $importbutton
99:
100: button to take the select results and go to group sorting
101:
102: =item %groupsearch_db
103:
104: Database hash used to save values for the groupsearch RAT interface.
105:
106: =item $diropendb
107:
108: The full path to the (temporary) search database file. This is set and
109: used in &handler() and is also used in &output_results().
110:
111: =item %Views
112:
113: Hash which associates an output view description with the function
114: that produces it. Adding a new view type should be as easy as
115: adding a line to the definition of this hash and making sure the function
116: takes the proper parameters.
117:
118: =back
119:
120: =cut
121:
122: ######################################################################
123: ######################################################################
124:
125: # -- dynamically rendered interface components
126: my $importbutton; # button to take the selected results and go to group sorting
127:
128: # -- miscellaneous variables
129: my %groupsearch_db; # database hash
130: my $diropendb = ""; # db file
131: # View Description Function Pointer
132: my %Views = ("Detailed Citation View" => \&detailed_citation_view,
133: "Summary View" => \&summary_view,
134: "Fielded Format" => \&fielded_format_view,
135: "XML/SGML" => \&xml_sgml_view,
136: "Compact View" => \&compact_view);
137: my %persistent_db;
138: my $hidden_fields;
139: ######################################################################
140: ######################################################################
141:
142: =pod
143:
144: =item &handler() - main handler invoked by httpd child
145:
146: =item Variables
147:
148: =over 4
149:
150: =item $hidden
151:
152: holds 'hidden' html forms
153:
154: =item $scrout
155:
156: string that holds portions of the screen output
157:
158: =back
159:
160: =cut
161:
162: ######################################################################
163: ######################################################################
164: sub handler {
165: my $r = shift;
166: #
167: my $closebutton; # button that closes the search window
168: # This button is different for the RAT compared to
169: # normal invocation.
170: #
171: $r->content_type('text/html');
172: $r->send_http_header;
173: return OK if $r->header_only;
174: ##
175: ## Prevent caching of the search interface window. Hopefully this means
176: ## we will get the launch=1 passed in a little more.
177: &Apache::loncommon::no_cache($r);
178: ##
179: ## Pick up form fields passed in the links.
180: ##
181: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
182: ['catalogmode','launch','acts','mode','form','element','pause',
183: 'phase','persistent_db_id','table','start','show']);
184: ##
185: ## The following is a trick - we wait a few seconds if asked to so
186: ## the daemon running the search can get ahead of the daemon
187: ## printing the results. We only need (theoretically) to do
188: ## this once, so the pause indicator is deleted
189: ##
190: if (exists($ENV{'form.pause'})) {
191: sleep(3);
192: delete($ENV{'form.pause'});
193: }
194: ##
195: ## Initialize global variables
196: ##
197: my $domain = $r->dir_config('lonDefDomain');
198: $diropendb= "/home/httpd/perl/tmp/".&Apache::lonnet::escape($domain).
199: "\_".&Apache::lonnet::escape($ENV{'user.name'})."_searchcat.db";
200: #
201: # set the name of the persistent database
202: # $ENV{'form.persistent_db_id'} can only have digits in it.
203: if (! exists($ENV{'form.persistent_db_id'}) ||
204: ($ENV{'form.persistent_db_id'} =~ /\D/) ||
205: ($ENV{'form.launch'} eq '1')) {
206: $ENV{'form.persistent_db_id'} = time;
207: }
208: my $persistent_db_file = "/home/httpd/perl/tmp/".
209: &Apache::lonnet::escape($domain).
210: '_'.&Apache::lonnet::escape($ENV{'user.name'}).
211: '_'.$ENV{'form.persistent_db_id'}.'_persistent_search.db';
212: ##
213: if (! &get_persistent_form_data($persistent_db_file)) {
214: if ($ENV{'form.phase'} =~ /(run_search|results)/) {
215: &Apache::lonnet::logthis("lonsearchcat:Unable to recover data ".
216: "from $persistent_db_file");
217: $r->print(<<END);
218: <html>
219: <head><title>LON-CAPA Search Error</title></head>
220: <body>
221: We were unable to retrieve data describing your search. This is a serious
222: error and has been logged. Please alert your LON-CAPA administrator.
223: </body>
224: </html>
225: END
226: return OK;
227: }
228: }
229: ##
230: ## Clear out old values from groupsearch database
231: ##
232: untie %groupsearch_db if (tied(%groupsearch_db));
233: if (($ENV{'form.launch'} eq '1') &&
234: ($ENV{'form.catalogmode'} eq 'groupsearch')) {
235: if (tie(%groupsearch_db,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
236: &start_fresh_session();
237: untie %groupsearch_db;
238: } else {
239: $r->print('<html><head></head><body>Unable to tie hash to db '.
240: 'file</body></html>');
241: return OK;
242: }
243: }
244: ##
245: ## Configure hidden fields
246: ##
247: $hidden_fields = '<input type="hidden" name="persistent_db_id" value="'.
248: $ENV{'form.persistent_db_id'}.'" />'."\n";
249: if (exists($ENV{'form.catalogmode'})) {
250: $hidden_fields .= '<input type="hidden" name="catalogmode" value="'.
251: $ENV{'form.catalogmode'}.'" />'."\n";
252: }
253: if (exists($ENV{'form.form'})) {
254: $hidden_fields .= '<input type="hidden" name="form" value="'.
255: $ENV{'form.form'}.'" />'."\n";
256: }
257: if (exists($ENV{'form.element'})) {
258: $hidden_fields .= '<input type="hidden" name="element" value="'.
259: $ENV{'form.element'}.'" />'."\n";
260: }
261: if (exists($ENV{'form.mode'})) {
262: $hidden_fields .= '<input type="hidden" name="mode" value="'.
263: $ENV{'form.mode'}.'" />'."\n";
264: }
265: ##
266: ## Configure dynamic components of interface
267: ##
268: if ($ENV{'form.catalogmode'} eq 'interactive') {
269: $closebutton="<input type='button' name='close' value='CLOSE' ";
270: if ($ENV{'form.phase'} =~ /(results|run_search)/) {
271: $closebutton .="onClick='parent.close()'";
272: } else {
273: $closebutton .="onClick='self.close()'";
274: }
275: $closebutton .=">\n";
276: } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') {
277: $closebutton="<input type='button' name='close' value='CLOSE' ";
278: if ($ENV{'form.phase'} =~ /(results|run_search)/) {
279: $closebutton .="onClick='parent.close()'";
280: } else {
281: $closebutton .="onClick='self.close()'";
282: }
283: $closebutton .= ">";
284: $importbutton=<<END;
285: <input type='button' name='import' value='IMPORT'
286: onClick='javascript:select_group()'>
287: END
288: } else {
289: $closebutton = '';
290: $importbutton = '';
291: }
292: ##
293: ## Sanity checks on form elements
294: ##
295: if (!defined($ENV{'form.viewselect'})) {
296: if (($ENV{'form.catalogmode'} eq 'groupsearch') ||
297: ($ENV{'form.catalogmode'} eq 'interactive')) {
298: $ENV{'form.viewselect'} ="Compact View";
299: } else {
300: $ENV{'form.viewselect'} ="Detailed Citation View";
301: }
302: }
303: $ENV{'form.phase'} = 'disp_basic' if (! exists($ENV{'form.phase'}));
304: $ENV{'form.show'} = 20 if (! exists($ENV{'form.show'}));
305: ##
306: ## Switch on the phase
307: ##
308: if ($ENV{'form.phase'} eq 'disp_basic') {
309: &print_basic_search_form($r,$closebutton);
310: } elsif ($ENV{'form.phase'} eq 'disp_adv') {
311: &print_advanced_search_form($r,$closebutton);
312: } elsif ($ENV{'form.phase'} eq 'results') {
313: &display_results($r,$importbutton,$closebutton);
314: } elsif ($ENV{'form.phase'} =~ /^(sort|run_search)$/) {
315: my ($query,$customquery,$customshow,$libraries,$pretty_string) =
316: &get_persistent_data($persistent_db_file,
317: ['query','customquery','customshow',
318: 'libraries','pretty_string']);
319: if ($ENV{'form.phase'} eq 'sort') {
320: &print_sort_form($r,$pretty_string);
321: } elsif ($ENV{'form.phase'} eq 'run_search') {
322: &run_search($r,$query,$customquery,$customshow,
323: $libraries,$pretty_string);
324: }
325: } elsif(($ENV{'form.phase'} eq 'basic_search') ||
326: ($ENV{'form.phase'} eq 'adv_search')) {
327: $ENV{'form.searchmode'} = 'basic';
328: if ($ENV{'form.phase'} eq 'adv_search') {
329: $ENV{'form.searchmode'} = 'advanced';
330: }
331: # Set up table
332: if (! defined(&create_results_table())) {
333: $r->print(<<END);
334: <html><head><title>Search Error</title></head>
335: <body>
336: Unable to create table in which to store search results.
337: The search has been aborted.
338: </body>
339: </html>
340: END
341: return OK;
342: }
343: delete($ENV{'form.launch'});
344: if (! &make_form_data_persistent($r,$persistent_db_file)) {
345: $r->print(<<END);
346: <html><head><title>Search Error</title></head>
347: <body>
348: Unable to properly store search information. The search has been aborted.
349: </body>
350: </html>
351: END
352: return OK;
353: }
354: #
355: # We are running a search
356: my ($query,$customquery,$customshow,$libraries) =
357: (undef,undef,undef,undef);
358: my $pretty_string;
359: if ($ENV{'form.phase'} eq 'basic_search') {
360: ($query,$pretty_string) = &parse_basic_search($r,$closebutton);
361: } else { # Advanced search
362: ($query,$customquery,$customshow,$libraries,$pretty_string)
363: = &parse_advanced_search($r,$closebutton);
364: return OK if (! defined($query));
365: }
366: &make_persistent({ query => $query,
367: customquery => $customquery,
368: customshow => $customshow,
369: libraries => $libraries,
370: pretty_string => $pretty_string },
371: $persistent_db_file);
372: ##
373: ## Print out the frames interface
374: ##
375: &print_frames_interface($r);
376: }
377: return OK;
378: }
379:
380: ######################################################################
381: ######################################################################
382:
383: =pod
384:
385: =item &print_basic_search_form()
386:
387: Returns a scalar which holds html for the basic search form.
388:
389: =cut
390:
391: ######################################################################
392: ######################################################################
393:
394: sub print_basic_search_form{
395: my ($r,$closebutton) = @_;
396: my $scrout=<<"ENDDOCUMENT";
397: <html>
398: <head>
399: <title>The LearningOnline Network with CAPA</title>
400: <script type="text/javascript">
401: function openhelp(val) {
402: openhelpwin=open('/adm/help/searchcat.html','helpscreen',
403: 'scrollbars=1,width=600,height=300');
404: openhelpwin.focus();
405: }
406: </script>
407: </head>
408: <body bgcolor="#FFFFFF">
409: <img align='right' src='/adm/lonIcons/lonlogos.gif' />
410: <h1>Search Catalog</h1>
411: <form method="post" action="/adm/searchcat">
412: <input type="hidden" name="phase" value="basic_search" />
413: $hidden_fields
414: <h3>Basic Search</h3>
415: <p>
416: Enter terms or phrases separated by AND, OR, or NOT
417: then press SEARCH below.
418: </p>
419: <p>
420: <table>
421: <tr><td>
422: ENDDOCUMENT
423: $scrout.=' '.&simpletextfield('basicexp',$ENV{'form.basicexp'},40).
424: ' ';
425: my $checkbox = &simplecheckbox('related',$ENV{'form.related'});
426: $scrout.=<<END;
427: </td><td><a href="/adm/searchcat?phase=disp_adv">Advanced Search</a></td></tr>
428: <tr><td>$checkbox use related words</td><td></td></tr>
429: </table>
430: </p>
431: <p>
432: <input type="submit" name="basicsubmit" value='SEARCH' />
433: $closebutton
434: END
435: $scrout.=&selectbox(undef,'viewselect',
436: $ENV{'form.viewselect'},
437: undef,undef,undef,
438: sort(keys(%Views)));
439: $scrout.=&selectbox(undef,'show',
440: $ENV{'form.show'},
441: undef,undef,undef,
442: (10,20,50,100));
443: $scrout.=<<ENDDOCUMENT;
444: per page.
445: </p>
446: </form>
447: </body>
448: </html>
449: ENDDOCUMENT
450: $r->print($scrout);
451: return;
452: }
453: ######################################################################
454: ######################################################################
455:
456: =pod
457:
458: =item &advanced_search_form()
459:
460: Returns a scalar which holds html for the advanced search form.
461:
462: =cut
463:
464: ######################################################################
465: ######################################################################
466:
467: sub print_advanced_search_form{
468: my ($r,$closebutton) = @_;
469: my $advanced_buttons = <<"END";
470: <p>
471: <input type="submit" name="advancedsubmit" value='SEARCH' />
472: <input type="reset" name="reset" value='RESET' />
473: $closebutton
474: <input type="button" value="HELP" onClick="openhelp()" />
475: </p>
476: END
477: if (!defined($ENV{'form.viewselect'})) {
478: $ENV{'form.viewselect'} ="Detailed Citation View";
479: }
480: my $scrout=<<"ENDHEADER";
481: <html>
482: <head>
483: <title>The LearningOnline Network with CAPA</title>
484: <script type="text/javascript">
485: function openhelp(val) {
486: openhelpwin=open('/adm/help/searchcat.html','helpscreen',
487: 'scrollbars=1,width=600,height=300');
488: openhelpwin.focus();
489: }
490: </script>
491: </head>
492: <body bgcolor="#FFFFFF">
493: <img align='right' src='/adm/lonIcons/lonlogos.gif' />
494: <h1>Advanced Catalog Search</h1>
495: <hr />
496: Enter terms or phrases separated by search operators
497: such as AND, OR, or NOT.<br />
498: <form method="post" action="/adm/searchcat">
499: $advanced_buttons
500: $hidden_fields
501: <input type="hidden" name="phase" value="adv_search" />
502: <table>
503: <tr><td><font color="#800000" face="helvetica"><b>VIEW:</b></font></td>
504: <td>
505: ENDHEADER
506: $scrout.=&selectbox(undef,'viewselect',
507: $ENV{'form.viewselect'},
508: undef,undef,undef,
509: sort(keys(%Views)));
510: $scrout.=' ';
511: $scrout.=&selectbox(undef,'show',
512: $ENV{'form.show'},
513: undef,undef,undef,
514: (10,20,50,100));
515: $scrout.=' '.
516: '<font color="#800000" face="helvetica">Per Page</font>';
517: $scrout.="</td><td>Related<br />Words</td></tr>\n";
518: $scrout.=&searchphrasefield_with_related('title', 'title' ,
519: $ENV{'form.title'});
520: $scrout.=&searchphrasefield('author', 'author' ,$ENV{'form.author'});
521: $scrout.=&searchphrasefield_with_related('subject', 'subject' ,
522: $ENV{'form.subject'});
523: $scrout.=&searchphrasefield_with_related('keywords','keywords',
524: $ENV{'form.keywords'});
525: $scrout.=&searchphrasefield('URL', 'url' ,$ENV{'form.url'});
526: $scrout.=&searchphrasefield_with_related('notes', 'notes' ,
527: $ENV{'form.notes'});
528: $scrout.=&searchphrasefield_with_related('abstract','abstract',
529: $ENV{'form.abstract'});
530: # Hack - an empty table row.
531: $scrout.="<tr><td> </td><td> </td><td> </td></tr>\n";
532: $scrout.=&searchphrasefield('file<br />extension','mime',
533: $ENV{'form.mime'});
534: $scrout.="<tr><td> </td><td> </td><td> </td></tr>\n";
535: $scrout.=&searchphrasefield('publisher<br />owner','owner',
536: $ENV{'form.owner'});
537: $scrout.="</table>\n";
538: $ENV{'form.category'}='any' unless length($ENV{'form.category'});
539: $scrout.=&selectbox('File Category','category',
540: $ENV{'form.category'},
541: 'any','Any category',
542: undef,
543: (&Apache::loncommon::filecategories()));
544: $ENV{'form.language'}='any' unless length($ENV{'form.language'});
545: #----------------------------------------------------------------
546: # Allow restriction to multiple domains.
547: # I make the crazy assumption that there will never be a domain 'any'.
548: #
549: $ENV{'form.domains'} = 'any' if (! exists($ENV{'form.domains'}));
550: my @allowed_domains = (ref($ENV{'form.domains'}) ? @{$ENV{'form.domains'}}
551: : ($ENV{'form.domains'}) );
552: my %domain_hash = ();
553: foreach (@allowed_domains) {
554: $domain_hash{$_}++;
555: }
556: my @domains =&Apache::loncommon::get_domains();
557: # adjust the size of the select box
558: my $size = 4;
559: my $size = (scalar @domains < ($size - 1) ? scalar @domains + 1 : $size);
560: $scrout.="\n".'<font color="#800000" face="helvetica"><b>'.
561: 'DOMAINS</b></font><br />'.
562: '<select name="domains" size="'.$size.'" multiple>'."\n".
563: '<option name="any" value="any" '.
564: ($domain_hash{'any'}? 'selected ' :'').
565: '>all domains</option>'."\n";
566: foreach my $dom (sort @domains) {
567: $scrout.="<option name=\"$dom\" ".
568: ($domain_hash{$dom} ? 'selected ' :'').">$dom</option>\n";
569: }
570: $scrout.="</select>\n";
571: #----------------------------------------------------------------
572: $scrout.=&selectbox('Limit by language','language',
573: $ENV{'form.language'},'any','Any Language',
574: \&{Apache::loncommon::languagedescription},
575: (&Apache::loncommon::languageids),
576: );
577: # ------------------------------------------------ Compute date selection boxes
578: $scrout.=<<CREATIONDATESTART;
579: <p>
580: <font color="#800000" face="helvetica"><b>LIMIT BY CREATION DATE RANGE:</b>
581: </font>
582: <br />
583: between:
584: CREATIONDATESTART
585: $scrout.=&dateboxes('creationdatestart',1,1,1976,
586: $ENV{'form.creationdatestart_month'},
587: $ENV{'form.creationdatestart_day'},
588: $ENV{'form.creationdatestart_year'},
589: );
590: $scrout.="and:\n";
591: $scrout.=&dateboxes('creationdateend',12,31,2051,
592: $ENV{'form.creationdateend_month'},
593: $ENV{'form.creationdateend_day'},
594: $ENV{'form.creationdateend_year'},
595: );
596: $scrout.="</p>";
597: $scrout.=<<LASTREVISIONDATESTART;
598: <p>
599: <font color="#800000" face="helvetica"><b>LIMIT BY LAST REVISION DATE RANGE:
600: </b></font>
601: <br />between:
602: LASTREVISIONDATESTART
603: $scrout.=&dateboxes('lastrevisiondatestart',1,1,1976,
604: $ENV{'form.lastrevisiondatestart_month'},
605: $ENV{'form.lastrevisiondatestart_day'},
606: $ENV{'form.lastrevisiondatestart_year'},
607: );
608: $scrout.=<<LASTREVISIONDATEEND;
609: and:
610: LASTREVISIONDATEEND
611: $scrout.=&dateboxes('lastrevisiondateend',12,31,2051,
612: $ENV{'form.lastrevisiondateend_month'},
613: $ENV{'form.lastrevisiondateend_day'},
614: $ENV{'form.lastrevisiondateend_year'},
615: );
616: $scrout.='</p>';
617: $ENV{'form.copyright'}='any' unless length($ENV{'form.copyright'});
618: $scrout.=&selectbox('Limit by copyright/distribution','copyright',
619: $ENV{'form.copyright'},
620: 'any','Any copyright/distribution',
621: \&{Apache::loncommon::copyrightdescription},
622: (&Apache::loncommon::copyrightids),
623: );
624: # ------------------------------------------- Compute customized metadata field
625: # $scrout.=<<CUSTOMMETADATA;
626: #<p>
627: #<font color="#800000" face="helvetica"><b>LIMIT BY SPECIAL METADATA FIELDS:</b>
628: #</font>
629: #For resource-specific metadata, enter in an expression in the form of
630: #<i>key</i>=<i>value</i> separated by operators such as AND, OR or NOT.<br />
631: #<b>Example:</b> grandmother=75 OR grandfather=85
632: #<br />
633: #CUSTOMMETADATA
634: # $scrout.=&simpletextfield('custommetadata',$ENV{'form.custommetadata'});
635: # $scrout.=<<CUSTOMSHOW;
636: #<p>
637: #<font color="#800000" face="helvetica"><b>SHOW SPECIAL METADATA FIELDS:</b>
638: #</font>
639: #Enter in a space-separated list of special metadata fields to show
640: #in a fielded listing for each record result.
641: #<br />
642: #CUSTOMSHOW
643: # $scrout.=&simpletextfield('customshow',$ENV{'form.customshow'});
644: $scrout.=<<ENDDOCUMENT;
645: $advanced_buttons
646: </form>
647: </body>
648: </html>
649: ENDDOCUMENT
650: $r->print($scrout);
651: return;
652: }
653:
654: ######################################################################
655: ######################################################################
656:
657: =pod
658:
659: =item &get_persistent_form_data
660:
661: Inputs: filename of database
662:
663: Outputs: returns undef on database errors.
664:
665: This function is the reverse of &make_persistent() for form data.
666: Retrieve persistent data from %persistent_db. Retrieved items will have their
667: values unescaped. If a form value already exists in $ENV, it will not be
668: overwritten. Form values that are array references may have values appended
669: to them.
670:
671: =cut
672:
673: ######################################################################
674: ######################################################################
675: sub get_persistent_form_data {
676: my $filename = shift;
677: return 0 if (! -e $filename);
678: return undef if (! tie(%persistent_db,'GDBM_File',$filename,
679: &GDBM_READER(),0640));
680: #
681: # These make sure we do not get array references printed out as 'values'.
682: my %arrays_allowed = ('form.category'=>1,'form.domains'=>1);
683: #
684: # Loop through the keys, looking for 'form.'
685: foreach my $name (keys(%persistent_db)) {
686: next if ($name !~ /^form./);
687: next if (exists($ENV{$name}));
688: my @values = map {
689: &Apache::lonnet::unescape($_);
690: } split(',',$persistent_db{$name});
691: next if (@values <1);
692: if ($arrays_allowed{$name}) {
693: $ENV{$name} = [@values];
694: } else {
695: $ENV{$name} = $values[0] if ($values[0]);
696: }
697: }
698: untie (%persistent_db);
699: return 1;
700: }
701: ######################################################################
702: ######################################################################
703:
704: =pod
705:
706: =item &get_persistent_data
707:
708: Inputs: filename of database, ref to array of values to recover.
709:
710: Outputs: array of values. Returns undef on error.
711:
712: This function is the reverse of &make_persistent();
713: Retrieve persistent data from %persistent_db. Retrieved items will have their
714: values unescaped. If the item contains commas (before unescaping), the
715: returned value will be an array pointer.
716:
717: =cut
718:
719: ######################################################################
720: ######################################################################
721: sub get_persistent_data {
722: my $filename = shift;
723: my @Vars = @{shift()};
724: my @Values; # Return array
725: return undef if (! -e $filename);
726: return undef if (! tie(%persistent_db,'GDBM_File',$filename,
727: &GDBM_READER(),0640));
728: foreach my $name (@Vars) {
729: if (! exists($persistent_db{$name})) {
730: push @Values, undef;
731: next;
732: }
733: my @values = map {
734: &Apache::lonnet::unescape($_);
735: } split(',',$persistent_db{$name});
736: if (@values <= 1) {
737: push @Values,$values[0];
738: } else {
739: push @Values,\@values;
740: }
741: }
742: untie (%persistent_db);
743: return @Values;
744: }
745:
746: ######################################################################
747: ######################################################################
748:
749: =pod
750:
751: =item &make_persistent()
752:
753: Inputs: Hash of values to save, filename of persistent database.
754:
755: Store variables away to the %persistent_db.
756: Values will be escaped. Values that are array pointers will have their
757: elements escaped and concatenated in a comma seperated string.
758:
759: =cut
760:
761: ######################################################################
762: ######################################################################
763: sub make_persistent {
764: my %save = %{shift()};
765: my $filename = shift;
766: return undef if (! tie(%persistent_db,'GDBM_File',
767: $filename,&GDBM_WRCREAT(),0640));
768: foreach my $name (keys(%save)) {
769: my @values = (ref($save{$name}) ? @{$save{$name}} : ($save{$name}));
770: # We handle array references, but not recursively.
771: my $store = join(',', map { &Apache::lonnet::escape($_); } @values );
772: $persistent_db{$name} = $store;
773: }
774: untie(%persistent_db);
775: return 1;
776: }
777:
778: ######################################################################
779: ######################################################################
780:
781: =pod
782:
783: =item &make_form_data_persistent()
784:
785: Inputs: filename of persistent database.
786:
787: Store most form variables away to the %persistent_db.
788: Values will be escaped. Values that are array pointers will have their
789: elements escaped and concatenated in a comma seperated string.
790:
791: =cut
792:
793: ######################################################################
794: ######################################################################
795: sub make_form_data_persistent {
796: my $r = shift;
797: my $filename = shift;
798: my %save;
799: foreach (keys(%ENV)) {
800: next if (!/^form/ || /submit/);
801: $save{$_} = $ENV{$_};
802: }
803: return &make_persistent(\%save,$filename);
804: }
805:
806: ######################################################################
807: # HTML form building functions #
808: ######################################################################
809:
810: =pod
811:
812: =item HTML form building functions
813:
814: =over 4
815:
816: =cut
817:
818: ###############################################
819: ###############################################
820:
821: =pod
822:
823: =item &simpletextfield()
824:
825: Inputs: $name,$value,$size
826:
827: Returns a text input field with the given name, value, and size.
828: If size is not specified, a value of 20 is used.
829:
830: =cut
831:
832: ###############################################
833: ###############################################
834:
835: sub simpletextfield {
836: my ($name,$value,$size)=@_;
837: $size = 20 if (! defined($size));
838: return '<input type="text" name="'.$name.
839: '" size="'.$size.'" value="'.$value.'" />';
840: }
841:
842: ###############################################
843: ###############################################
844:
845: =pod
846:
847: =item &simplecheckbox()
848:
849: Inputs: $name,$value
850:
851: Returns a simple check box with the given $name.
852: If $value eq 'on' the box is checked.
853:
854: =cut
855:
856: ###############################################
857: ###############################################
858:
859: sub simplecheckbox {
860: my ($name,$value)=@_;
861: my $checked='';
862: $checked="checked" if $value eq 'on';
863: return '<input type="checkbox" name="'.$name.'" '. $checked . ' />';
864: }
865:
866: ###############################################
867: ###############################################
868:
869: =pod
870:
871: =item &fieldtitle()
872:
873: Input: $title
874:
875: Returns a scalar with html which will display $title as a search
876: field heading.
877:
878: =cut
879:
880: ###############################################
881: ###############################################
882:
883: sub fieldtitle {
884: my $title = uc(shift());
885: return '<font color="#800000" face="helvetica"><b>'.$title.
886: ': </b></font>';
887: }
888:
889: ###############################################
890: ###############################################
891:
892: =pod
893:
894: =item &searchphrasefield()
895:
896: Inputs: $title,$name,$value
897:
898: Returns html for a title line and an input field for entering search terms.
899: The entry field (which is where the $name and $value are used) is a 50 column
900: simpletextfield. The html returned is for a row in a three column table.
901:
902: =cut
903:
904: ###############################################
905: ###############################################
906:
907: sub searchphrasefield {
908: my ($title,$name,$value)=@_;
909: return '<tr><td>'.&fieldtitle($title).'</td><td>'.
910: &simpletextfield($name,$value,50)."</td><td> </td></tr>\n";
911: }
912:
913: ###############################################
914: ###############################################
915:
916: =pod
917:
918: =item &searchphrasefield_with_related()
919:
920: Inputs: $title,$name,$value
921:
922: Returns html for a title line and an input field for entering search terms
923: and a check box for 'related words'. The entry field (which is where the
924: $name and $value are used) is a 50 column simpletextfield. The name of
925: the related words checkbox is "$name_related".
926:
927: =cut
928:
929: ###############################################
930: ###############################################
931:
932: sub searchphrasefield_with_related {
933: my ($title,$name,$value)=@_;
934: return '<tr><td>'.&fieldtitle($title).'</td><td>'.
935: &simpletextfield($name,$value,50).'</td><td align="center"> '.
936: &simplecheckbox($name.'_related',$ENV{'form.'.$name.'_related'}).
937: " </td></tr>\n";
938: }
939:
940: ###############################################
941: ###############################################
942:
943: =pod
944:
945: =item &dateboxes()
946:
947: Returns html selection form elements for the specification of
948: the day, month, and year.
949:
950: =cut
951:
952: ###############################################
953: ###############################################
954:
955: sub dateboxes {
956: my ($name,$defaultmonth,$defaultday,$defaultyear,
957: $currentmonth,$currentday,$currentyear)=@_;
958: ($defaultmonth,$defaultday,$defaultyear)=('','','');
959: #
960: # Day
961: my $day=<<END;
962: <select name="${name}_day">
963: <option value='$defaultday'> </option>
964: END
965: for (my $i = 1; $i<=31; $i++) {
966: $day.="<option value=\"$i\">$i</option>\n";
967: }
968: $day.="</select>\n";
969: $day=~s/(\"$currentday\")/$1 SELECTED/ if length($currentday);
970: #
971: # Month
972: my $month=<<END;
973: <select name="${name}_month">
974: <option value='$defaultmonth'> </option>
975: END
976: my $i = 1;
977: foreach (qw/January February March April May June
978: July August September October November December /){
979: $month .="<option value=\"$i\">$_</option>\n";
980: $i++;
981: }
982: $month.="</select>\n";
983: $month=~s/(\"$currentmonth\")/$1 SELECTED/ if length($currentmonth);
984: #
985: # Year (obviously)
986: my $year=<<END;
987: <select name="${name}_year">
988: <option value='$defaultyear'> </option>
989: END
990: my $maxyear = 2051;
991: for (my $i = 1976; $i<=$maxyear; $i++) {
992: $year.="<option value=\"$i\">$i</option>\n";
993: }
994: $year.="</select>\n";
995: $year=~s/(\"$currentyear\")/$1 SELECTED/ if length($currentyear);
996: return "$month$day$year";
997: }
998:
999: ###############################################
1000: ###############################################
1001:
1002: =pod
1003:
1004: =item &selectbox()
1005:
1006: Returns a scalar containing an html <select> form.
1007:
1008: Inputs:
1009:
1010: =over 4
1011:
1012: =item $title
1013:
1014: Printed above the select box, in uppercase. If undefined, only a select
1015: box will be returned, with no additional html.
1016:
1017: =item $name
1018:
1019: The name element of the <select> tag.
1020:
1021: =item $default
1022:
1023: The default value of the form. Can be $anyvalue, or in @idlist.
1024:
1025: =item $anyvalue
1026:
1027: The <option value="..."> used to indicate a default of
1028: none of the values. Can be undef.
1029:
1030: =item $anytag
1031:
1032: The text associate with $anyvalue above.
1033:
1034: =item $functionref
1035:
1036: Each element in @idlist will be passed as a parameter
1037: to the function referenced here. The return value of the function should
1038: be a scalar description of the items. If this value is undefined the
1039: description of each item in @idlist will be the item name.
1040:
1041: =item @idlist
1042:
1043: The items to be selected from. One of these or $anyvalue will be the
1044: value returned by the form element, $ENV{form.$name}.
1045:
1046: =back
1047:
1048: =cut
1049:
1050: ###############################################
1051:
1052: sub selectbox {
1053: my ($title,$name,$default,$anyvalue,$anytag,$functionref,@idlist)=@_;
1054: if (! defined($functionref)) { $functionref = sub { $_[0]}; }
1055: my $selout='';
1056: if (defined($title)) {
1057: my $uctitle=uc($title);
1058: $selout="\n".'<p><font color="#800000" face="helvetica">'.
1059: '<b>'.$uctitle.': </b></font>';
1060: }
1061: $selout .= '<select name="'.$name.'">';
1062: unshift @idlist,$anyvalue if (defined($anyvalue));
1063: foreach (@idlist) {
1064: $selout.='<option value="'.$_.'"';
1065: if ($_ eq $default and !/^any$/) {
1066: $selout.=' selected >'.&{$functionref}($_).'</option>';
1067: }
1068: elsif ($_ eq $default and /^$anyvalue$/) {
1069: $selout.=' selected >'.$anytag.'</option>';
1070: }
1071: else {$selout.='>'.&{$functionref}($_).'</option>';}
1072: }
1073: return $selout.'</select>'.(defined($title)?'</p>':' ');
1074: }
1075:
1076: ######################################################################
1077: # End of HTML form building functions #
1078: ######################################################################
1079:
1080: =pod
1081:
1082: =back
1083:
1084: =cut
1085:
1086:
1087: ######################################################################
1088: ######################################################################
1089:
1090: =pod
1091:
1092: =item &parse_advanced_search()
1093:
1094: Parse advanced search form and return the following:
1095:
1096: =over 4
1097:
1098: =item $query Scalar containing an SQL query.
1099:
1100: =item $customquery Scalar containing a custom query.
1101:
1102: =item $customshow Scalar containing commands to show custom metadata.
1103:
1104: =item $libraries_to_query Reference to array of domains to search.
1105:
1106: =back
1107:
1108: =cut
1109:
1110: ######################################################################
1111: ######################################################################
1112: sub parse_advanced_search {
1113: my ($r,$closebutton)=@_;
1114: my $fillflag=0;
1115: my $pretty_search_string = "<br />\n";
1116: # Clean up fields for safety
1117: for my $field ('title','author','subject','keywords','url','version',
1118: 'creationdatestart_month','creationdatestart_day',
1119: 'creationdatestart_year','creationdateend_month',
1120: 'creationdateend_day','creationdateend_year',
1121: 'lastrevisiondatestart_month','lastrevisiondatestart_day',
1122: 'lastrevisiondatestart_year','lastrevisiondateend_month',
1123: 'lastrevisiondateend_day','lastrevisiondateend_year',
1124: 'notes','abstract','mime','language','owner',
1125: 'custommetadata','customshow','category') {
1126: $ENV{"form.$field"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1127: }
1128: foreach ('mode','form','element') {
1129: # is this required? Hmmm.
1130: next unless (exists($ENV{"form.$_"}));
1131: $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"});
1132: $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1133: }
1134: # Preprocess the category form element.
1135: $ENV{'form.category'} = 'any' if (ref($ENV{'form.category'}));
1136: if ($ENV{'form.category'} ne 'any') {
1137: my @extensions = &Apache::loncommon::filecategorytypes
1138: ($ENV{'form.category'});
1139: $ENV{'form.mime'} = join ' OR ',@extensions;
1140: }
1141: # Check to see if enough information was filled in
1142: for my $field ('title','author','subject','keywords','url','version',
1143: 'notes','abstract','mime','language','owner',
1144: 'custommetadata') {
1145: if (&filled($ENV{"form.$field"})) {
1146: $fillflag++;
1147: }
1148: }
1149: unless ($fillflag) {
1150: &output_blank_field_error($r,$closebutton,'phase=disp_adv');
1151: return ;
1152: }
1153: # Turn the form input into a SQL-based query
1154: my $query='';
1155: my @queries;
1156: my $font = '<font color="#800000" face="helvetica">';
1157: # Evaluate logical expression AND/OR/NOT phrase fields.
1158: foreach my $field ('title','author','subject','notes','abstract','url',
1159: 'keywords','version','owner','mime') {
1160: if ($ENV{'form.'.$field}) {
1161: my $searchphrase = $ENV{'form.'.$field};
1162: $pretty_search_string .= $font."$field</font> contains <b>".
1163: $searchphrase."</b>";
1164: if ($ENV{'form.'.$field.'_related'}) {
1165: my @New_Words;
1166: ($searchphrase,@New_Words) = &related_version($searchphrase);
1167: if (@New_Words) {
1168: $pretty_search_string .= " with related words: ".
1169: "<b>@New_Words</b>.";
1170: } else {
1171: $pretty_search_string .= " with no related words.";
1172: }
1173: }
1174: $pretty_search_string .= "<br />\n";
1175: push @queries,&build_SQL_query($field,$searchphrase);
1176: }
1177: }
1178: # I dislike the hack below.
1179: if ($ENV{'form.category'}) {
1180: $ENV{'form.mime'}='';
1181: }
1182: # Evaluate option lists
1183: if ($ENV{'form.language'} and $ENV{'form.language'} ne 'any') {
1184: push @queries,"(language like \"$ENV{'form.language'}\")";
1185: $pretty_search_string.=$font."language</font>= ".
1186: &Apache::loncommon::languagedescription($ENV{'form.language'}).
1187: "<br />\n";
1188: }
1189: if ($ENV{'form.copyright'} and $ENV{'form.copyright'} ne 'any') {
1190: push @queries,"(copyright like \"$ENV{'form.copyright'}\")";
1191: $pretty_search_string.=$font."copyright</font> = ".
1192: &Apache::loncommon::copyrightdescription($ENV{'form.copyright'}).
1193: "<br \>\n";
1194: }
1195: #
1196: # Evaluate date windows
1197: my $datequery=&build_date_queries(
1198: $ENV{'form.creationdatestart_month'},
1199: $ENV{'form.creationdatestart_day'},
1200: $ENV{'form.creationdatestart_year'},
1201: $ENV{'form.creationdateend_month'},
1202: $ENV{'form.creationdateend_day'},
1203: $ENV{'form.creationdateend_year'},
1204: $ENV{'form.lastrevisiondatestart_month'},
1205: $ENV{'form.lastrevisiondatestart_day'},
1206: $ENV{'form.lastrevisiondatestart_year'},
1207: $ENV{'form.lastrevisiondateend_month'},
1208: $ENV{'form.lastrevisiondateend_day'},
1209: $ENV{'form.lastrevisiondateend_year'},
1210: );
1211: # Test to see if date windows are legitimate
1212: if ($datequery=~/^Incorrect/) {
1213: &output_date_error($r,$datequery,$closebutton);
1214: return ;
1215: } elsif ($datequery) {
1216: # Here is where you would set up pretty_search_string to output
1217: # date query information.
1218: push @queries,$datequery;
1219: }
1220: # Process form information for custom metadata querying
1221: my $customquery=undef;
1222: # if ($ENV{'form.custommetadata'}) {
1223: # $pretty_search_string .=$font."Custom Metadata Search</font>: <b>".
1224: # $ENV{'form.custommetadata'}."</b><br />\n";
1225: # $customquery=&build_custommetadata_query('custommetadata',
1226: # $ENV{'form.custommetadata'});
1227: # }
1228: my $customshow=undef;
1229: # if ($ENV{'form.customshow'}) {
1230: # $pretty_search_string .=$font."Custom Metadata Display</font>: <b>".
1231: # $ENV{'form.customshow'}."</b><br />\n";
1232: # $customshow=$ENV{'form.customshow'};
1233: # $customshow=~s/[^\w\s]//g;
1234: # my @fields=split(/\s+/,$customshow);
1235: # $customshow=join(" ",@fields);
1236: # }
1237: ## ---------------------------------------------------------------
1238: ## Deal with restrictions to given domains
1239: ##
1240: my $libraries_to_query = undef;
1241: # $ENV{'form.domains'} can be either a scalar or an array reference.
1242: # We need an array.
1243: my @allowed_domains = (ref($ENV{'form.domains'}) ? @{$ENV{'form.domains'}}
1244: : ($ENV{'form.domains'}) );
1245: my %domain_hash = ();
1246: my $pretty_domains_string;
1247: foreach (@allowed_domains) {
1248: $domain_hash{$_}++;
1249: }
1250: if ($domain_hash{'any'}) {
1251: $pretty_domains_string = "In all LON-CAPA domains.";
1252: } else {
1253: if (@allowed_domains > 1) {
1254: $pretty_domains_string = "In LON-CAPA domains:";
1255: } else {
1256: $pretty_domains_string = "In LON-CAPA domain ";
1257: }
1258: foreach (sort @allowed_domains) {
1259: $pretty_domains_string .= "<b>".$_."</b> ";
1260: }
1261: foreach (keys(%Apache::lonnet::libserv)) {
1262: if (exists($domain_hash{$Apache::lonnet::hostdom{$_}})) {
1263: push @$libraries_to_query,$_;
1264: }
1265: }
1266: }
1267: $pretty_search_string .= $pretty_domains_string."<br />\n";
1268: #
1269: if (@queries) {
1270: $query=join(" AND ",@queries);
1271: $query="select * from metadata where $query";
1272: } elsif ($customquery) {
1273: $query = '';
1274: }
1275: return ($query,$customquery,$customshow,$libraries_to_query,
1276: $pretty_search_string);
1277: }
1278:
1279: ######################################################################
1280: ######################################################################
1281:
1282: =pod
1283:
1284: =item &parse_basic_search()
1285:
1286: Parse the basic search form and return a scalar containing an sql query.
1287:
1288: =cut
1289:
1290: ######################################################################
1291: ######################################################################
1292: sub parse_basic_search {
1293: my ($r,$closebutton)=@_;
1294: # Clean up fields for safety
1295: for my $field ('basicexp') {
1296: $ENV{"form.$field"}=~s/[^\w\s\(\)\-]//g;
1297: }
1298: foreach ('mode','form','element') {
1299: # is this required? Hmmm.
1300: next unless (exists($ENV{"form.$_"}));
1301: $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"});
1302: $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1303: }
1304:
1305: # Check to see if enough is filled in
1306: unless (&filled($ENV{'form.basicexp'})) {
1307: &output_blank_field_error($r,$closebutton,'phase=disp_basic');
1308: return OK;
1309: }
1310: my $pretty_search_string = '<b>'.$ENV{'form.basicexp'}.'</b>';
1311: my $search_string = $ENV{'form.basicexp'};
1312: if ($ENV{'form.related'}) {
1313: my @New_Words;
1314: ($search_string,@New_Words) = &related_version($ENV{'form.basicexp'});
1315: if (@New_Words) {
1316: $pretty_search_string .= " with related words: <b>@New_Words</b>.";
1317: } else {
1318: $pretty_search_string .= " with no related words.";
1319: }
1320: }
1321: # Build SQL query string based on form page
1322: my $query='';
1323: my $concatarg=join('," ",',
1324: ('title', 'author', 'subject', 'notes', 'abstract',
1325: 'keywords'));
1326: $concatarg='title' if $ENV{'form.titleonly'};
1327: $query=&build_SQL_query('concat('.$concatarg.')',$search_string);
1328: $pretty_search_string .= "<br />\n";
1329: return 'select * from metadata where '.$query,$pretty_search_string;
1330: }
1331:
1332:
1333: ######################################################################
1334: ######################################################################
1335:
1336: =pod
1337:
1338: =item &related_version
1339:
1340: Modifies an input string to include related words. Words in the string
1341: are replaced with parenthesized lists of 'OR'd words. For example
1342: "torque" is replaced with "(torque OR word1 OR word2 OR ...)".
1343:
1344: Note: Using this twice on a string is probably silly.
1345:
1346: =cut
1347:
1348: ######################################################################
1349: ######################################################################
1350: sub related_version {
1351: my $search_string = shift;
1352: my $result = $search_string;
1353: my %New_Words = ();
1354: while ($search_string =~ /(\w+)/cg) {
1355: my $word = $1;
1356: next if (lc($word) =~ /\b(or|and|not)\b/);
1357: my @Words = &Apache::loncommon::get_related_words($word);
1358: @Words = ($#Words>4? @Words[0..4] : @Words);
1359: foreach (@Words) { $New_Words{$_}++;}
1360: my $replacement = join " OR ", ($word,@Words);
1361: $result =~ s/(\b)$word(\b)/$1($replacement)$2/g;
1362: }
1363: return $result,sort(keys(%New_Words));
1364: }
1365:
1366: ######################################################################
1367: ######################################################################
1368:
1369: =pod
1370:
1371: =item &build_SQL_query()
1372:
1373: Builds a SQL query string from a logical expression with AND/OR keywords
1374: using Text::Query and &recursive_SQL_query_builder()
1375:
1376: =cut
1377:
1378: ######################################################################
1379: ######################################################################
1380: sub build_SQL_query {
1381: my ($field_name,$logic_statement)=@_;
1382: my $q=new Text::Query('abc',
1383: -parse => 'Text::Query::ParseAdvanced',
1384: -build => 'Text::Query::Build');
1385: $q->prepare($logic_statement);
1386: my $matchexp=${$q}{'matchexp'}; chomp $matchexp;
1387: my $sql_query=&recursive_SQL_query_build($field_name,$matchexp);
1388: return $sql_query;
1389: }
1390:
1391: ######################################################################
1392: ######################################################################
1393:
1394: =pod
1395:
1396: =item &build_custommetadata_query()
1397:
1398: Constructs a custom metadata query using a rather heinous regular
1399: expression.
1400:
1401: =cut
1402:
1403: ######################################################################
1404: ######################################################################
1405: sub build_custommetadata_query {
1406: my ($field_name,$logic_statement)=@_;
1407: my $q=new Text::Query('abc',
1408: -parse => 'Text::Query::ParseAdvanced',
1409: -build => 'Text::Query::BuildAdvancedString');
1410: $q->prepare($logic_statement);
1411: my $matchexp=${$q}{'-parse'}{'-build'}{'matchstring'};
1412: # quick fix to change literal into xml tag-matching
1413: # will eventually have to write a separate builder module
1414: # wordone=wordtwo becomes\<wordone\>[^\<] *wordtwo[^\<]*\<\/wordone\>
1415: $matchexp =~ s/(\w+)\\=([\w\\\+]+)?# wordone=wordtwo is changed to
1416: /\\<$1\\>?# \<wordone\>
1417: \[\^\\<\]?# [^\<]
1418: \*$2\[\^\\<\]?# *wordtwo[^\<]
1419: \*\\<\\\/$1\\>?# *\<\/wordone\>
1420: /g;
1421: return $matchexp;
1422: }
1423:
1424: ######################################################################
1425: ######################################################################
1426:
1427: =pod
1428:
1429: =item &recursive_SQL_query_build()
1430:
1431: Recursively constructs an SQL query. Takes as input $dkey and $pattern.
1432:
1433: =cut
1434:
1435: ######################################################################
1436: ######################################################################
1437: sub recursive_SQL_query_build {
1438: my ($dkey,$pattern)=@_;
1439: my @matches=($pattern=~/(\[[^\]|\[]*\])/g);
1440: return $pattern unless @matches;
1441: foreach my $match (@matches) {
1442: $match=~/\[ (\w+)\s(.*) \]/;
1443: my ($key,$value)=($1,$2);
1444: my $replacement='';
1445: if ($key eq 'literal') {
1446: $replacement="($dkey like \"\%$value\%\")";
1447: }
1448: elsif ($key eq 'not') {
1449: $value=~s/like/not like/;
1450: # $replacement="($dkey not like $value)";
1451: $replacement="$value";
1452: }
1453: elsif ($key eq 'and') {
1454: $value=~/(.*[\"|\)]) ([|\(|\^].*)/;
1455: $replacement="($1 AND $2)";
1456: }
1457: elsif ($key eq 'or') {
1458: $value=~/(.*[\"|\)]) ([|\(|\^].*)/;
1459: $replacement="($1 OR $2)";
1460: }
1461: substr($pattern,
1462: index($pattern,$match),
1463: length($match),
1464: $replacement
1465: );
1466: }
1467: &recursive_SQL_query_build($dkey,$pattern);
1468: }
1469:
1470: ######################################################################
1471: ######################################################################
1472:
1473: =pod
1474:
1475: =item &build_date_queries()
1476:
1477: Builds a SQL logic query to check time/date entries.
1478: Also reports errors (check for /^Incorrect/).
1479:
1480: =cut
1481:
1482: ######################################################################
1483: ######################################################################
1484: sub build_date_queries {
1485: my ($cmonth1,$cday1,$cyear1,$cmonth2,$cday2,$cyear2,
1486: $lmonth1,$lday1,$lyear1,$lmonth2,$lday2,$lyear2)=@_;
1487: my @queries;
1488: if ($cmonth1 or $cday1 or $cyear1 or $cmonth2 or $cday2 or $cyear2) {
1489: unless ($cmonth1 and $cday1 and $cyear1 and
1490: $cmonth2 and $cday2 and $cyear2) {
1491: return "Incorrect entry for the creation date. You must specify ".
1492: "a starting month, day, and year and an ending month, ".
1493: "day, and year.";
1494: }
1495: my $cnumeric1=sprintf("%d%2d%2d",$cyear1,$cmonth1,$cday1);
1496: $cnumeric1+=0;
1497: my $cnumeric2=sprintf("%d%2d%2d",$cyear2,$cmonth2,$cday2);
1498: $cnumeric2+=0;
1499: if ($cnumeric1>$cnumeric2) {
1500: return "Incorrect entry for the creation date. The starting ".
1501: "date must occur before the ending date.";
1502: }
1503: my $cquery="(creationdate BETWEEN '$cyear1-$cmonth1-$cday1' AND '".
1504: "$cyear2-$cmonth2-$cday2 23:59:59')";
1505: push @queries,$cquery;
1506: }
1507: if ($lmonth1 or $lday1 or $lyear1 or $lmonth2 or $lday2 or $lyear2) {
1508: unless ($lmonth1 and $lday1 and $lyear1 and
1509: $lmonth2 and $lday2 and $lyear2) {
1510: return "Incorrect entry for the last revision date. You must ".
1511: "specify a starting month, day, and year and an ending ".
1512: "month, day, and year.";
1513: }
1514: my $lnumeric1=sprintf("%d%2d%2d",$lyear1,$lmonth1,$lday1);
1515: $lnumeric1+=0;
1516: my $lnumeric2=sprintf("%d%2d%2d",$lyear2,$lmonth2,$lday2);
1517: $lnumeric2+=0;
1518: if ($lnumeric1>$lnumeric2) {
1519: return "Incorrect entry for the last revision date. The ".
1520: "starting date must occur before the ending date.";
1521: }
1522: my $lquery="(lastrevisiondate BETWEEN '$lyear1-$lmonth1-$lday1' AND '".
1523: "$lyear2-$lmonth2-$lday2 23:59:59')";
1524: push @queries,$lquery;
1525: }
1526: if (@queries) {
1527: return join(" AND ",@queries);
1528: }
1529: return '';
1530: }
1531:
1532: ######################################################################
1533: ######################################################################
1534:
1535: =pod
1536:
1537: =item ©right_check()
1538:
1539: =cut
1540:
1541: ######################################################################
1542: ######################################################################
1543: sub copyright_check {
1544: my $Metadata = shift;
1545: # Check copyright tags and skip results the user cannot use
1546: my (undef,undef,$resdom,$resname) = split('/',
1547: $Metadata->{'url'});
1548: # Check for priv
1549: if (($Metadata->{'copyright'} eq 'priv') &&
1550: (($ENV{'user.name'} ne $resname) &&
1551: ($ENV{'user.domain'} ne $resdom))) {
1552: return 0;
1553: }
1554: # Check for domain
1555: if (($Metadata->{'copyright'} eq 'domain') &&
1556: ($ENV{'user.domain'} ne $resdom)) {
1557: return 0;
1558: }
1559: return 1;
1560: }
1561:
1562:
1563: ######################################################################
1564: ######################################################################
1565:
1566: =pod
1567:
1568: =item &ensure_db_and_table
1569:
1570: Ensure we can get lonmysql to connect to the database and the table we
1571: need exists.
1572:
1573: Inputs: $r, table id
1574:
1575: Returns: undef on error, 1 if the table exists.
1576:
1577: =cut
1578:
1579: ######################################################################
1580: ######################################################################
1581: sub ensure_db_and_table {
1582: my ($r,$table) = @_;
1583: ##
1584: ## Sanity check the table id.
1585: ##
1586: if (! defined($table) || $table eq '' || $table =~ /\D/ ) {
1587: $r->print("Unable to retrieve search results. ".
1588: "Unable to determine the table results were stored in. ".
1589: "</body></html>");
1590: return undef;
1591: }
1592: ##
1593: ## Make sure we can connect and the table exists.
1594: ##
1595: my $connection_result = &Apache::lonmysql::connect_to_db();
1596: if (!defined($connection_result)) {
1597: $r->print("Unable to connect to the MySQL database where your results".
1598: " are stored. </body></html>");
1599: &Apache::lonnet::logthis("lonsearchcat: unable to get lonmysql to".
1600: " connect to database.");
1601: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
1602: return undef;
1603: }
1604: my $table_check = &Apache::lonmysql::check_table($table);
1605: if (! defined($table_check)) {
1606: $r->print("A MySQL error has occurred.</form></body></html>");
1607: &Apache::lonnet::logthis("lonmysql was unable to determine the status".
1608: " of table ".$table);
1609: return undef;
1610: } elsif (! $table_check) {
1611: $r->print("The table of results could not be found.");
1612: &Apache::lonnet::logthis("The user requested a table, ".$table.
1613: ", that could not be found.");
1614: return undef;
1615: }
1616: return 1;
1617: }
1618:
1619: ######################################################################
1620: ######################################################################
1621:
1622: =pod
1623:
1624: =item &print_sort_form
1625:
1626: =cut
1627:
1628: ######################################################################
1629: ######################################################################
1630: sub print_sort_form {
1631: my ($r,$pretty_query_string) = @_;
1632: ##
1633: my %SortableFields =
1634: (id => 'Default',
1635: title => 'Title',
1636: author => 'Author',
1637: subject => 'Subject',
1638: url => 'URL',
1639: version => 'Version Number',
1640: mime => 'Mime type',
1641: lang => 'Language',
1642: owner => 'Owner/Publisher',
1643: copyright => 'Copyright',
1644: hostname => 'Host',
1645: creationdate => 'Creation Date',
1646: lastrevisiondate => 'Revision Date',
1647: );
1648: ##
1649: my $table = $ENV{'form.table'};
1650: return if (! &ensure_db_and_table($r,$table));
1651: ##
1652: ## Get the number of results
1653: ##
1654: my $total_results = &Apache::lonmysql::number_of_rows($table);
1655: if (! defined($total_results)) {
1656: $r->print("A MySQL error has occurred.</form></body></html>");
1657: &Apache::lonnet::logthis("lonmysql was unable to determine the number".
1658: " of rows in table ".$table);
1659: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
1660: return;
1661: }
1662: my $result;
1663: $result.=<<END;
1664: <html>
1665: <head>
1666: <script>
1667: function change_sort() {
1668: var newloc = "/adm/searchcat?phase=results";
1669: newloc += "&persistent_db_id=$ENV{'form.persistent_db_id'}";
1670: newloc += "&sortby=";
1671: newloc += document.forms.statusform.elements.sortby.value;
1672: parent.resultsframe.location= newloc;
1673: }
1674: </script>
1675: <title>Results</title>
1676: </head>
1677: <body>
1678: <form name="statusform" action="" method="post">
1679: <input type="hidden" name="Queue" value="" />
1680: END
1681:
1682: #<h2>Sort Results</h2>
1683: #Sort by: <select size="1" name="sortby" onchange="javascript:change_sort();">
1684: # $ENV{'form.sortby'} = 'id' if (! defined($ENV{'form.sortby'}));
1685: # foreach (keys(%SortableFields)) {
1686: # $result.="<option name=\"$_\"";
1687: # if ($_ eq $ENV{'form.sortby'}) {
1688: # $result.=" selected ";
1689: # }
1690: # $result.=" >$SortableFields{$_}</option>\n";
1691: # }
1692: # $result.="</select>\n";
1693: my $revise = &revise_button();
1694: $result.=<<END;
1695: <p>
1696: There are $total_results matches to your query. $revise
1697: </p><p>
1698: Search:$pretty_query_string
1699: </p>
1700: </form>
1701: </body>
1702: </html>
1703: END
1704: $r->print($result);
1705: return;
1706: }
1707:
1708: #####################################################################
1709: #####################################################################
1710:
1711: =pod
1712:
1713: =item MySQL Table Description
1714:
1715: MySQL table creation requires a precise description of the data to be
1716: stored. The use of the correct types to hold data is vital to efficient
1717: storage and quick retrieval of records. The columns must be described in
1718: the following format:
1719:
1720: =cut
1721:
1722: ##
1723: ## Restrictions:
1724: ## columns of type 'text' and 'blob' cannot have defaults.
1725: ## columns of type 'enum' cannot be used for FULLTEXT.
1726: ##
1727: my @DataOrder = qw/id title author subject url keywords version notes
1728: abstract mime lang owner copyright creationdate lastrevisiondate hostname/;
1729:
1730: my %Datatypes =
1731: ( id =>{ type => 'MEDIUMINT',
1732: restrictions => 'UNSIGNED NOT NULL',
1733: primary_key => 'yes',
1734: auto_inc => 'yes'
1735: },
1736: title =>{ type=>'TEXT'},
1737: author =>{ type=>'TEXT'},
1738: subject =>{ type=>'TEXT'},
1739: url =>{ type=>'TEXT',
1740: restrictions => 'NOT NULL' },
1741: keywords =>{ type=>'TEXT'},
1742: version =>{ type=>'TEXT'},
1743: notes =>{ type=>'TEXT'},
1744: abstract =>{ type=>'TEXT'},
1745: mime =>{ type=>'TEXT'},
1746: lang =>{ type=>'TEXT'},
1747: owner =>{ type=>'TEXT'},
1748: copyright =>{ type=>'TEXT'},
1749: hostname =>{ type=>'TEXT'},
1750: #--------------------------------------------------
1751: creationdate =>{ type=>'DATETIME'},
1752: lastrevisiondate =>{ type=>'DATETIME'},
1753: #--------------------------------------------------
1754: );
1755:
1756: my @Fullindicies =
1757: qw/title/;
1758: # qw/title author subject abstract mime language owner copyright/;
1759:
1760: ######################################################################
1761: ######################################################################
1762:
1763: =pod
1764:
1765: =item &create_results_table()
1766:
1767: Creates the table of search results by calling lonmysql. Stores the
1768: table id in $ENV{'form.table'}
1769:
1770: Inputs: none.
1771:
1772: Returns: the identifier of the table on success, undef on error.
1773:
1774: =cut
1775:
1776: ######################################################################
1777: ######################################################################
1778: sub create_results_table {
1779: my $table = &Apache::lonmysql::create_table
1780: ( { columns => \%Datatypes,
1781: column_order => \@DataOrder,
1782: fullindex => \@Fullindicies,
1783: } );
1784: if (defined($table)) {
1785: $ENV{'form.table'} = $table;
1786: return $table;
1787: }
1788: return undef; # Error...
1789: }
1790:
1791: ######################################################################
1792: ######################################################################
1793:
1794: =pod
1795:
1796: =item Search Status update functions
1797:
1798: Each of the following functions changes the values of one of the
1799: input fields used to display the search status to the user. The names
1800: should be explanatory.
1801:
1802: Inputs: Apache request handler ($r), text to display.
1803:
1804: Returns: Nothing.
1805:
1806: =over 4
1807:
1808: =item &update_count_status()
1809:
1810: =item &update_status()
1811:
1812: =item &update_seconds()
1813:
1814: =back
1815:
1816: =cut
1817:
1818: ######################################################################
1819: ######################################################################
1820: sub update_count_status {
1821: my ($r,$text) = @_;
1822: $text =~ s/\'/\\\'/g;
1823: $r->print
1824: ("<script>document.statusform.count.value = ' $text'</script>\n");
1825: $r->rflush();
1826: }
1827:
1828: sub update_status {
1829: my ($r,$text) = @_;
1830: $text =~ s/\'/\\\'/g;
1831: $r->print
1832: ("<script>document.statusform.status.value = ' $text'</script>\n");
1833: $r->rflush();
1834: }
1835:
1836: sub update_seconds {
1837: my ($r,$text) = @_;
1838: $text =~ s/\'/\\\'/g;
1839: $r->print
1840: ("<script>document.statusform.seconds.value = ' $text'</script>\n");
1841: $r->rflush();
1842: }
1843:
1844: ######################################################################
1845: ######################################################################
1846:
1847: =pod
1848:
1849: =item &revise_button
1850:
1851: Inputs: None
1852:
1853: Returns: html string for a 'revise search' button.
1854:
1855: =cut
1856:
1857: ######################################################################
1858: ######################################################################
1859: sub revise_button {
1860: my $revise_phase = 'disp_basic';
1861: $revise_phase = 'disp_adv' if ($ENV{'form.searchmode'} eq 'advanced');
1862: my $newloc = '/adm/searchcat'.
1863: '?persistent_db_id='.$ENV{'form.persistent_db_id'}.
1864: '&phase='.$revise_phase;
1865: my $result = qq{<input type="button" value="Revise search" name="revise"} .
1866: qq{ onClick="parent.location='$newloc';" /> };
1867: return $result;
1868: }
1869:
1870: ######################################################################
1871: ######################################################################
1872:
1873: =pod
1874:
1875: =item &run_search
1876:
1877: =cut
1878:
1879: ######################################################################
1880: ######################################################################
1881: sub run_search {
1882: my ($r,$query,$customquery,$customshow,$serverlist,$pretty_string) = @_;
1883: my $connection = $r->connection;
1884: #
1885: # Timing variables
1886: #
1887: my $starttime = time;
1888: my $max_time = 30; # seconds for the search to complete
1889: #
1890: # Print run_search header
1891: #
1892: $r->print(<<END);
1893: <html>
1894: <head><title>Search Status</title></head>
1895: <body>
1896: <form name="statusform" action="" method="post">
1897: <input type="hidden" name="Queue" value="" />
1898: END
1899: # Check to see if $pretty_string has more than one carriage return.
1900: # Assume \n s are following <br /> s and truncate the value.
1901: # (there is probably a better way)...
1902: my @Lines = split /<br \/>/,$pretty_string;
1903: if (@Lines > 2) {
1904: $pretty_string = join '<br \>',(@Lines[0..2],'....<br />');
1905: }
1906: $r->print("Search: ".$pretty_string);
1907: $r->rflush();
1908: #
1909: # Determine the servers we need to contact.
1910: #
1911: my @Servers_to_contact;
1912: if (defined($serverlist)) {
1913: if (ref($serverlist) eq 'ARRAY') {
1914: @Servers_to_contact = @$serverlist;
1915: } else {
1916: @Servers_to_contact = ($serverlist);
1917: }
1918: } else {
1919: @Servers_to_contact = sort(keys(%Apache::lonnet::libserv));
1920: }
1921: my %Server_status;
1922: my $table =$ENV{'form.table'};
1923: if (! defined($table) || $table eq '' || $table =~ /\D/ ) {
1924: $r->print("Unable to determine table id to store search results in.".
1925: "The search has been aborted.</body></html>");
1926: return;
1927: }
1928: my $table_status = &Apache::lonmysql::check_table($table);
1929: if (! defined($table_status)) {
1930: $r->print("Unable to determine status of table.</body></html>");
1931: &Apache::lonnet::logthis("Bogus table id of $table for ".
1932: "$ENV{'user.name'} @ $ENV{'user.domain'}");
1933: &Apache::lonnet::logthis("lonmysql error = ".
1934: &Apache::lonmysql::get_error());
1935: return;
1936: }
1937: if (! $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: ##
1945: my $hitcountsum;
1946: my $server;
1947: my $status;
1948: my $revise = &revise_button();
1949: $r->print(<<END);
1950: <table>
1951: <tr><th>Status</th><th>Total Matches</th><th>Time Remaining</th><th></th></tr>
1952: <tr>
1953: <td><input type="text" name="status" value="" size="30" /></td>
1954: <td><input type="text" name="count" value="" size="10" /></td>
1955: <td><input type="text" name="seconds" value="" size="8" /></td>
1956: <td>$revise</td>
1957: </tr>
1958: </table>
1959: </form>
1960: END
1961: $r->rflush();
1962: my $time_remaining = $max_time - (time - $starttime) ;
1963: my $last_time = $time_remaining;
1964: &update_seconds($r,$time_remaining);
1965: while (($time_remaining > 0) &&
1966: ((@Servers_to_contact) || keys(%Server_status))) {
1967: # Send out a search request if it needs to be done.
1968: if (@Servers_to_contact) {
1969: # Contact one server
1970: my $server = shift(@Servers_to_contact);
1971: my $reply=&Apache::lonnet::metadata_query($query,$customquery,
1972: $customshow,[$server]);
1973: ($server) = keys(%$reply);
1974: $Server_status{$server} = $reply->{$server};
1975: &update_status($r,'contacting '.$server);
1976: } else {
1977: # wait a sec. to give time for files to be written
1978: # This sleep statement is here instead of outside the else
1979: # block because we do not want to pause if we have servers
1980: # left to contact.
1981: sleep(1);
1982: }
1983: &update_status($r,'waiting on '.(join(' ',keys(%Server_status))));
1984: while (my ($server,$status) = each(%Server_status)) {
1985: last if ($connection->aborted());
1986: if ($status eq 'con_lost') {
1987: delete ($Server_status{$server});
1988: next;
1989: }
1990: $status=~/^([\.\w]+)$/;
1991: my $datafile=$r->dir_config('lonDaemons').'/tmp/'.$1;
1992: if (-e $datafile && ! -e "$datafile.end") {
1993: &update_status($r,'Receiving results from '.$server);
1994: next;
1995: }
1996: last if ($connection->aborted());
1997: if (-e "$datafile.end") {
1998: &update_status($r,'Reading results from '.$server);
1999: if (-z "$datafile") {
2000: delete($Server_status{$server});
2001: next;
2002: }
2003: my $fh;
2004: if (!($fh=Apache::File->new($datafile))) {
2005: $r->print("Unable to open search results file for ".
2006: "server $server. Omitting from search");
2007: delete($Server_status{$server});
2008: next;
2009: }
2010: # Read in the whole file.
2011: while (my $result = <$fh>) {
2012: last if ($connection->aborted());
2013: # handle custom fields? Someday we will!
2014: chomp($result);
2015: next unless $result;
2016: # Parse the result.
2017: my %Fields = &parse_raw_result($result,$server);
2018: $Fields{'hostname'} = $server;
2019: next if (! ©right_check(\%Fields));
2020: # Store the result in the mysql database
2021: my $result = &Apache::lonmysql::store_row($table,\%Fields);
2022: if (! defined($result)) {
2023: $r->print(&Apache::lonmysql::get_error());
2024: }
2025: # $r->print(&Apache::lonmysql::get_debug());
2026: $hitcountsum ++;
2027: $time_remaining = $max_time - (time - $starttime) ;
2028: if ($last_time - $time_remaining > 0) {
2029: &update_seconds($r,$time_remaining);
2030: $last_time = $time_remaining;
2031: }
2032: if ($hitcountsum % 50 == 0) {
2033: &update_count_status($r,$hitcountsum);
2034: }
2035: } # End of foreach (@results)
2036: $fh->close();
2037: # $server is only deleted if the results file has been
2038: # found and (successfully) opened. This may be a bad idea.
2039: delete($Server_status{$server});
2040: }
2041: last if ($connection->aborted());
2042: &update_count_status($r,$hitcountsum);
2043: }
2044: last if ($connection->aborted());
2045: # Finished looping through the servers
2046: $time_remaining = $max_time - (time - $starttime) ;
2047: if ($last_time - $time_remaining > 0) {
2048: $last_time = $time_remaining;
2049: &update_seconds($r,$time_remaining);
2050: }
2051: }
2052: &update_status($r,'Search Complete'.$server);
2053: &update_seconds($r,0);
2054: &Apache::lonmysql::disconnect_from_db();
2055: # We have run out of time or run out of servers to talk to and
2056: # results to get.
2057: $r->print("</body></html>");
2058: if ($ENV{'form.catalogmode'} ne 'groupsearch') {
2059: $r->print("<script>".
2060: "window.location='/adm/searchcat?".
2061: "phase=sort&".
2062: "persistent_db_id=$ENV{'form.persistent_db_id'}';".
2063: "</script>");
2064: }
2065: return;
2066: }
2067:
2068: ######################################################################
2069: ######################################################################
2070: =pod
2071:
2072: =item &prev_next_buttons
2073:
2074: =cut
2075:
2076: ######################################################################
2077: ######################################################################
2078: sub prev_next_buttons {
2079: my ($current_min,$show,$total,$parms) = @_;
2080: return '' if ($show eq 'all'); # No links if you get them all at once.
2081: my $links;
2082: ##
2083: ## Prev
2084: my $prev_min = $current_min - $show;
2085: $prev_min = 1 if $prev_min < 1;
2086: if ($prev_min < $current_min) {
2087: $links .= qq{
2088: <a href="/adm/searchcat?$parms&start=$prev_min&show=$show">prev</a>
2089: };
2090: } else {
2091: $links .= 'prev';
2092: }
2093: ##
2094: ## Pages.... Someday.
2095: ##
2096: $links .= qq{
2097: <a href="/adm/searchcat?$parms&start=$current_min&$show=$show">reload</a>
2098: };
2099: ##
2100: ## Next
2101: my $next_min = $current_min + $show;
2102: $next_min = $current_min if ($next_min > $total);
2103: if ($next_min != $current_min) {
2104: $links .= qq{
2105: <a href="/adm/searchcat?$parms&start=$next_min&show=$show">next</a>
2106: };
2107: } else {
2108: $links .= ' next';
2109: }
2110: return $links;
2111: }
2112: ######################################################################
2113: ######################################################################
2114:
2115: =pod
2116:
2117: =item &display_results
2118:
2119: =cut
2120:
2121: ######################################################################
2122: ######################################################################
2123: sub display_results {
2124: my ($r,$importbutton,$closebutton) = @_;
2125: my $connection = $r->connection;
2126: $r->print(&search_results_header($importbutton,$closebutton));
2127: ##
2128: ## Set viewing function
2129: ##
2130: my $viewfunction = $Views{$ENV{'form.viewselect'}};
2131: if (!defined($viewfunction)) {
2132: $r->print("Internal Error - Bad view selected.\n");
2133: $r->rflush();
2134: return;
2135: }
2136: ##
2137: ## Get the catalog controls setup
2138: ##
2139: my $action = "/adm/searchcat?phase=results";
2140: ##
2141: ## Deal with groupsearch
2142: ##
2143: if ($ENV{'form.catalogmode'} eq 'groupsearch') {
2144: if (! tie(%groupsearch_db,'GDBM_File',$diropendb,
2145: &GDBM_WRCREAT(),0640)) {
2146: $r->print('Unable to store import results.</form></body></html>');
2147: $r->rflush();
2148: return;
2149: }
2150: }
2151: ##
2152: ## Prepare the table for querying
2153: ##
2154: my $table = $ENV{'form.table'};
2155: return if (! &ensure_db_and_table($r,$table));
2156: ##
2157: ## Get the number of results
2158: ##
2159: my $total_results = &Apache::lonmysql::number_of_rows($table);
2160: if (! defined($total_results)) {
2161: $r->print("A MySQL error has occurred.</form></body></html>");
2162: &Apache::lonnet::logthis("lonmysql was unable to determine the number".
2163: " of rows in table ".$table);
2164: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
2165: return;
2166: }
2167: ##
2168: ## Determine how many results we need to get
2169: ##
2170: $ENV{'form.start'} = 1 if (! exists($ENV{'form.start'}));
2171: $ENV{'form.show'} = 'all' if (! exists($ENV{'form.show'}));
2172: my $min = $ENV{'form.start'};
2173: my $max;
2174: if ($ENV{'form.show'} eq 'all') {
2175: $max = $total_results ;
2176: } else {
2177: $max = $min + $ENV{'form.show'} - 1;
2178: $max = $total_results if ($max > $total_results);
2179: }
2180: ##
2181: ## Output links (if necessary) for 'prev' and 'next' pages.
2182: ##
2183: $r->print
2184: ('<center>'.
2185: &prev_next_buttons($min,$ENV{'form.show'},$total_results,
2186: "table=".$ENV{'form.table'}.
2187: "&phase=results".
2188: "&persistent_db_id=".$ENV{'form.persistent_db_id'})
2189: ."</center>\n"
2190: );
2191: if ($total_results == 0) {
2192: $r->print("There are currently no results.\n".
2193: "</form></body></html>");
2194: return;
2195: } else {
2196: $r->print
2197: ("<center>Results $min to $max out of $total_results</center>\n");
2198: }
2199: ##
2200: ## Get results from MySQL table
2201: ##
2202: my @Results = &Apache::lonmysql::get_rows($table,
2203: 'id>='.$min.' AND id<='.$max);
2204: ##
2205: ## Loop through the results and output them.
2206: ##
2207: foreach my $row (@Results) {
2208: if ($connection->aborted()) {
2209: untie %groupsearch_db if (tied(%groupsearch_db));
2210: &Apache::lonmysql::disconnect_from_db();
2211: return;
2212: }
2213: my %Fields = %{&parse_row(@$row)};
2214: my $output="<p>\n";
2215: my $prefix=&catalogmode_output($Fields{'title'},$Fields{'url'});
2216: # Render the result into html
2217: $output.= &$viewfunction($prefix,%Fields);
2218: # Print them out as they come in.
2219: $r->print($output);
2220: $r->rflush();
2221: }
2222: if (@Results < 1) {
2223: $r->print("There were no results matching your query");
2224: } else {
2225: $r->print
2226: ('<center>'.
2227: &prev_next_buttons($min,$ENV{'form.show'},$total_results,
2228: "table=".$ENV{'form.table'}.
2229: "&phase=results".
2230: "&persistent_db_id=".
2231: $ENV{'form.persistent_db_id'})
2232: ."</center>\n"
2233: );
2234: }
2235: $r->print("</form></body></html>");
2236: $r->rflush();
2237: untie %groupsearch_db if (tied(%groupsearch_db));
2238: return;
2239: }
2240:
2241: ######################################################################
2242: ######################################################################
2243:
2244: =pod
2245:
2246: =item &catalogmode_output($title,$url)
2247:
2248: Returns html needed for the various catalog modes. Gets inputs from
2249: $ENV{'form.catalogmode'}. Stores data in %groupsearch_db and $fnum
2250: (local variable).
2251:
2252: =cut
2253:
2254: ######################################################################
2255: ######################################################################
2256: {
2257: my $fnum = 0;
2258:
2259: sub catalogmode_output {
2260: my $output = '';
2261: my ($title,$url) = @_;
2262: if ($ENV{'form.catalogmode'} eq 'interactive') {
2263: $title=~ s/\'/\\\'/g;
2264: if ($ENV{'form.catalogmode'} eq 'interactive') {
2265: $output.=<<END
2266: <font size='-1'><INPUT TYPE="button" NAME="returnvalues" VALUE="SELECT"
2267: onClick="javascript:select_data('$title','$url')">
2268: </font>
2269: END
2270: }
2271: } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') {
2272: $groupsearch_db{"pre_${fnum}_link"}=$url;
2273: $groupsearch_db{"pre_${fnum}_title"}=$title;
2274: $output.=<<END;
2275: <font size='-1'>
2276: <input type="checkbox" name="returnvalues" value="SELECT"
2277: onClick="javascript:queue($fnum)" />
2278: </font>
2279: END
2280: $fnum++;
2281: }
2282: return $output;
2283: }
2284:
2285: }
2286: ######################################################################
2287: ######################################################################
2288:
2289: =pod
2290:
2291: =item &parse_row
2292:
2293: Parse a row returned from the database.
2294:
2295: =cut
2296:
2297: ######################################################################
2298: ######################################################################
2299: sub parse_row {
2300: my @Row = @_;
2301: my %Fields;
2302: for (my $i=0;$i<=$#Row;$i++) {
2303: $Fields{$DataOrder[$i]}=&Apache::lonnet::unescape($Row[$i]);
2304: }
2305: $Fields{'language'} =
2306: &Apache::loncommon::languagedescription($Fields{'lang'});
2307: $Fields{'copyrighttag'} =
2308: &Apache::loncommon::copyrightdescription($Fields{'copyright'});
2309: $Fields{'mimetag'} =
2310: &Apache::loncommon::filedescription($Fields{'mime'});
2311: return \%Fields;
2312: }
2313:
2314: ###########################################################
2315: ###########################################################
2316:
2317: =pod
2318:
2319: =item &parse_raw_result()
2320:
2321: Takes a line from the file of results and parse it. Returns a hash
2322: with keys for the following fields:
2323: 'title', 'author', 'subject', 'url', 'keywords', 'version', 'notes',
2324: 'abstract', 'mime', 'lang', 'owner', 'copyright', 'creationdate',
2325: 'lastrevisiondate'.
2326:
2327: In addition, the following tags are set by calling the appropriate
2328: lonnet function: 'language', 'cprtag', 'mimetag'.
2329:
2330: The 'title' field is set to "Untitled" if the title field is blank.
2331:
2332: 'abstract' and 'keywords' are truncated to 200 characters.
2333:
2334: =cut
2335:
2336: ###########################################################
2337: ###########################################################
2338: sub parse_raw_result {
2339: my ($result,$hostname) = @_;
2340: # Check for a comma - if it is there then we do not need to unescape the
2341: # string. There seems to be some kind of problem with some items in
2342: # the database - the entire string gets sent out unescaped...?
2343: unless ($result =~ /,/) {
2344: $result = &Apache::lonnet::unescape($result);
2345: }
2346: my @fields=map {
2347: &Apache::lonnet::unescape($_);
2348: } (split(/\,/,$result));
2349: my ($title,$author,$subject,$url,$keywords,$version,
2350: $notes,$abstract,$mime,$lang,
2351: $creationdate,$lastrevisiondate,$owner,$copyright)=@fields;
2352: my %Fields =
2353: ( title => &Apache::lonnet::unescape($title),
2354: author => &Apache::lonnet::unescape($author),
2355: subject => &Apache::lonnet::unescape($subject),
2356: url => &Apache::lonnet::unescape($url),
2357: keywords => &Apache::lonnet::unescape($keywords),
2358: version => &Apache::lonnet::unescape($version),
2359: notes => &Apache::lonnet::unescape($notes),
2360: abstract => &Apache::lonnet::unescape($abstract),
2361: mime => &Apache::lonnet::unescape($mime),
2362: lang => &Apache::lonnet::unescape($lang),
2363: owner => &Apache::lonnet::unescape($owner),
2364: copyright => &Apache::lonnet::unescape($copyright),
2365: creationdate => &Apache::lonnet::unescape($creationdate),
2366: lastrevisiondate => &Apache::lonnet::unescape($lastrevisiondate)
2367: );
2368: $Fields{'language'} =
2369: &Apache::loncommon::languagedescription($Fields{'lang'});
2370: $Fields{'copyrighttag'} =
2371: &Apache::loncommon::copyrightdescription($Fields{'copyright'});
2372: $Fields{'mimetag'} =
2373: &Apache::loncommon::filedescription($Fields{'mime'});
2374: if ($Fields{'author'}=~/^(\s*|error)$/) {
2375: $Fields{'author'}="Unknown Author";
2376: }
2377: # Put spaces in the keyword list, if needed.
2378: $Fields{'keywords'}=~ s/,([A-z])/, $1/g;
2379: if ($Fields{'title'}=~ /^\s*$/ ) {
2380: $Fields{'title'}='Untitled';
2381: }
2382: unless ($ENV{'user.adv'}) {
2383: # What is this anyway?
2384: $Fields{'keywords'} = '- not displayed -';
2385: $Fields{'notes'} = '- not displayed -';
2386: $Fields{'abstract'} = '- not displayed -';
2387: $Fields{'subject'} = '- not displayed -';
2388: }
2389: if (length($Fields{'abstract'})>200) {
2390: $Fields{'abstract'} =
2391: substr($Fields{'abstract'},0,200).'...';
2392: }
2393: if (length($Fields{'keywords'})>200) {
2394: $Fields{'keywords'} =
2395: substr($Fields{'keywords'},0,200).'...';
2396: }
2397: return %Fields;
2398: }
2399:
2400: ###########################################################
2401: ###########################################################
2402:
2403: =pod
2404:
2405: =item &handle_custom_fields()
2406:
2407: =cut
2408:
2409: ###########################################################
2410: ###########################################################
2411: sub handle_custom_fields {
2412: my @results = @{shift()};
2413: my $customshow='';
2414: my $extrashow='';
2415: my @customfields;
2416: if ($ENV{'form.customshow'}) {
2417: $customshow=$ENV{'form.customshow'};
2418: $customshow=~s/[^\w\s]//g;
2419: my @fields=map {
2420: "<font color=\"#008000\">$_:</font><!-- $_ -->";
2421: } split(/\s+/,$customshow);
2422: @customfields=split(/\s+/,$customshow);
2423: if ($customshow) {
2424: $extrashow="<ul><li>".join("</li><li>",@fields)."</li></ul>\n";
2425: }
2426: }
2427: my $customdata='';
2428: my %customhash;
2429: foreach my $result (@results) {
2430: if ($result=~/^(custom\=.*)$/) { # grab all custom metadata
2431: my $tmp=$result;
2432: $tmp=~s/^custom\=//;
2433: my ($k,$v)=map {&Apache::lonnet::unescape($_);
2434: } split(/\,/,$tmp);
2435: $customhash{$k}=$v;
2436: }
2437: }
2438: return ($extrashow,\@customfields,\%customhash);
2439: }
2440:
2441: ######################################################################
2442: ######################################################################
2443:
2444: =pod
2445:
2446: =item &search_results_header
2447:
2448: Output the proper html headers and javascript code to deal with different
2449: calling modes.
2450:
2451: Takes most inputs directly from %ENV, except $mode.
2452:
2453: =over 4
2454:
2455: =item $mode is either (at this writing) 'Basic' or 'Advanced'
2456:
2457: =back
2458:
2459: The following environment variables are checked:
2460:
2461: =over 4
2462:
2463: =item 'form.catalogmode'
2464:
2465: Checked for 'interactive' and 'groupsearch'.
2466:
2467: =item 'form.mode'
2468:
2469: Checked for existance & 'edit' mode.
2470:
2471: =item 'form.form'
2472:
2473: =item 'form.element'
2474:
2475: =back
2476:
2477: =cut
2478:
2479: ######################################################################
2480: ######################################################################
2481: sub search_results_header {
2482: my ($importbutton,$closebutton) = @_;
2483: my $result = '';
2484: # output beginning of search page
2485: # conditional output of script functions dependent on the mode in
2486: # which the search was invoked
2487: if ($ENV{'form.catalogmode'} eq 'interactive'){
2488: if (! exists($ENV{'form.mode'}) || $ENV{'form.mode'} ne 'edit') {
2489: $result.=<<SCRIPT;
2490: <script type="text/javascript">
2491: function select_data(title,url) {
2492: changeTitle(title);
2493: changeURL(url);
2494: parent.close();
2495: }
2496: function changeTitle(val) {
2497: if (parent.opener.inf.document.forms.resinfo.elements.t) {
2498: parent.opener.inf.document.forms.resinfo.elements.t.value=val;
2499: }
2500: }
2501: function changeURL(val) {
2502: if (parent.opener.inf.document.forms.resinfo.elements.u) {
2503: parent.opener.inf.document.forms.resinfo.elements.u.value=val;
2504: }
2505: }
2506: </script>
2507: SCRIPT
2508: } elsif ($ENV{'form.mode'} eq 'edit') {
2509: my $form = $ENV{'form.form'};
2510: my $element = $ENV{'form.element'};
2511: $result.=<<SCRIPT;
2512: <script type="text/javascript">
2513: function select_data(title,url) {
2514: changeURL(url);
2515: parent.close();
2516: }
2517: function changeTitle(val) {
2518: }
2519: function changeURL(val) {
2520: if (parent.targetwin.document) {
2521: parent.targetwin.document.forms["$form"].elements["$element"].value=val;
2522: } else {
2523: var url = 'forms[\"$form\"].elements[\"$element\"].value';
2524: alert("Unable to transfer data to "+url);
2525: }
2526: }
2527: </script>
2528: SCRIPT
2529: }
2530: }
2531: $result.=<<SCRIPT if $ENV{'form.catalogmode'} eq 'groupsearch';
2532: <script type="text/javascript">
2533: function queue(val) {
2534: if (document.forms.results.returnvalues[val].checked) {
2535: parent.statusframe.document.forms.statusform.elements.Queue.value +='1a'+val+'b';
2536: } else {
2537: parent.statusframe.document.forms.statusform.elements.Queue.value +='0a'+val+'b';
2538: }
2539: }
2540: function select_group() {
2541: parent.window.location=
2542: "/adm/groupsort?mode=$ENV{'form.mode'}&catalogmode=groupsearch&acts="+
2543: parent.statusframe.document.forms.statusform.elements.Queue.value;
2544: }
2545: </script>
2546: SCRIPT
2547: $result.=<<END;
2548: </head>
2549: <form name="results" method="post" action="" >
2550: <input type="hidden" name="Queue" value="" />
2551: $importbutton
2552: END
2553: return $result;
2554: }
2555:
2556: ######################################################################
2557: ######################################################################
2558: sub search_status_header {
2559: return <<ENDSTATUS;
2560: <html><head><title>Search Status</title></head>
2561: <body>
2562: <h3>Search Status</h3>
2563: Sending search request to LON-CAPA servers.<br />
2564: ENDSTATUS
2565: }
2566:
2567: sub results_link {
2568: my $basic_link = "/adm/searchcat?"."&table=".$ENV{'form.table'}.
2569: "&persistent_db_id=".$ENV{'form.persistent_db_id'};
2570: my $results_link = $basic_link."&phase=results".
2571: "&pause=1"."&start=1";
2572: return $results_link;
2573: }
2574:
2575: ######################################################################
2576: ######################################################################
2577: sub print_frames_interface {
2578: my $r = shift;
2579: my $basic_link = "/adm/searchcat?"."&table=".$ENV{'form.table'}.
2580: "&persistent_db_id=".$ENV{'form.persistent_db_id'};
2581: my $run_search_link = $basic_link."&phase=run_search";
2582: my $results_link = &results_link();
2583: my $result = <<"ENDFRAMES";
2584: <html>
2585: <head>
2586: <script>
2587: var targetwin = opener;
2588: </script>
2589: <title>LON-CAPA Digital Library Search Results</title>
2590: </head>
2591: <frameset rows="150,*">
2592: <frame name="statusframe" src="$run_search_link">
2593: <frame name="resultsframe" src="$results_link">
2594: </frameset>
2595: </html>
2596: ENDFRAMES
2597:
2598: $r->print($result);
2599: return;
2600: }
2601:
2602: ######################################################################
2603: ######################################################################
2604:
2605: =pod
2606:
2607: =item Metadata Viewing Functions
2608:
2609: Output is a HTML-ified string.
2610: Input arguments are title, author, subject, url, keywords, version,
2611: notes, short abstract, mime, language, creation date,
2612: last revision date, owner, copyright, hostname, and
2613: extra custom metadata to show.
2614:
2615: =over 4
2616:
2617: =item &detailed_citation_view()
2618:
2619: =cut
2620:
2621: ######################################################################
2622: ######################################################################
2623: sub detailed_citation_view {
2624: my ($prefix,%values) = @_;
2625: my $result=<<END;
2626: <b>$prefix<a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2627: target='search_preview'>$values{'title'}</a></b>
2628: <p>
2629: <b>$values{'author'}</b>, <i>$values{'owner'}</i><br />
2630:
2631: <b>Subject: </b> $values{'subject'}<br />
2632: <b>Keyword(s): </b> $values{'keywords'}<br />
2633: <b>Notes: </b> $values{'notes'}<br />
2634: <b>MIME Type: </b> $values{'mimetag'}<br />
2635: <b>Language: </b> $values{'language'}<br />
2636: <b>Copyright/Distribution:</b> $values{'cprtag'}<br />
2637: </p>
2638: $values{'extrashow'}
2639: <p>
2640: $values{'shortabstract'}
2641: </p>
2642: <hr align='left' width='200' noshade />
2643: END
2644: return $result;
2645: }
2646:
2647: ######################################################################
2648: ######################################################################
2649:
2650: =pod
2651:
2652: =item &summary_view()
2653:
2654: =cut
2655: ######################################################################
2656: ######################################################################
2657: sub summary_view {
2658: my ($prefix,%values) = @_;
2659: my $result=<<END;
2660: $prefix<a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2661: target='search_preview'>$values{'author'}</a><br />
2662: $values{'title'}<br />
2663: $values{'owner'} -- $values{'lastrevisiondate'}<br />
2664: $values{'copyrighttag'}<br />
2665: $values{'extrashow'}
2666: </p>
2667: <hr align='left' width='200' noshade />
2668: END
2669: return $result;
2670: }
2671:
2672: ######################################################################
2673: ######################################################################
2674:
2675: =pod
2676:
2677: =item &compact_view()
2678:
2679: =cut
2680:
2681: ######################################################################
2682: ######################################################################
2683: sub compact_view {
2684: my ($prefix,%values) = @_;
2685: my $result=<<END;
2686: $prefix <a href="http://$ENV{'HTTP_HOST'}$values{'url'}" target='search_preview'>
2687: $values{'title'}</a>
2688: <b>$values{'author'}</b><br />
2689: END
2690: return $result;
2691: }
2692:
2693:
2694: ######################################################################
2695: ######################################################################
2696:
2697: =pod
2698:
2699: =item &fielded_format_view()
2700:
2701: =cut
2702:
2703: ######################################################################
2704: ######################################################################
2705: sub fielded_format_view {
2706: my ($prefix,%values) = @_;
2707: my $result=<<END;
2708: $prefix
2709: <b>URL: </b> <a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2710: target='search_preview'>$values{'url'}</a>
2711: <br />
2712: <b>Title:</b> $values{'title'}<br />
2713: <b>Author(s):</b> $values{'author'}<br />
2714: <b>Subject:</b> $values{'subject'}<br />
2715: <b>Keyword(s):</b> $values{'keywords'}<br />
2716: <b>Notes:</b> $values{'notes'}<br />
2717: <b>MIME Type:</b> $values{'mimetag'}<br />
2718: <b>Language:</b> $values{'language'}<br />
2719: <b>Creation Date:</b> $values{'creationdate'}<br />
2720: <b>Last Revision Date:</b> $values{'lastrevisiondate'}<br />
2721: <b>Publisher/Owner:</b> $values{'owner'}<br />
2722: <b>Copyright/Distribution:</b> $values{'copyrighttag'}<br />
2723: <b>Repository Location:</b> $values{'hostname'}<br />
2724: <b>Abstract:</b> $values{'shortabstract'}<br />
2725: $values{'extrashow'}
2726: </p>
2727: <hr align='left' width='200' noshade />
2728: END
2729: return $result;
2730: }
2731:
2732: ######################################################################
2733: ######################################################################
2734:
2735: =pod
2736:
2737: =item &xml_sgml_view()
2738:
2739: =back
2740:
2741: =cut
2742:
2743: ######################################################################
2744: ######################################################################
2745: sub xml_sgml_view {
2746: my ($prefix,%values) = @_;
2747: my $result=<<END;
2748: $prefix
2749: <pre>
2750: <LonCapaResource>
2751: <url>$values{'url'}</url>
2752: <title>$values{'title'}</title>
2753: <author>$values{'author'}</author>
2754: <subject>$values{'subject'}</subject>
2755: <keywords>$values{'keywords'}</keywords>
2756: <notes>$values{'notes'}</notes>
2757: <mimeInfo>
2758: <mime>$values{'mime'}</mime>
2759: <mimetag>$values{'mimetag'}</mimetag>
2760: </mimeInfo>
2761: <languageInfo>
2762: <language>$values{'lang'}</language>
2763: <languagetag>$values{'language'}</languagetag>
2764: </languageInfo>
2765: <creationdate>$values{'creationdate'}</creationdate>
2766: <lastrevisiondate>$values{'lastrevisiondate'}</lastrevisiondate>
2767: <owner>$values{'owner'}</owner>
2768: <copyrightInfo>
2769: <copyright>$values{'copyright'}</copyright>
2770: <copyrighttag>$values{'copyrighttag'}</copyrighttag>
2771: </copyrightInfo>
2772: <repositoryLocation>$values{'hostname'}</repositoryLocation>
2773: <shortabstract>$values{'shortabstract'}</shortabstract>
2774: </LonCapaResource>
2775: </pre>
2776: $values{'extrashow'}
2777: <hr align='left' width='200' noshade />
2778: END
2779: return $result;
2780: }
2781:
2782: ######################################################################
2783: ######################################################################
2784:
2785: =pod
2786:
2787: =item &filled() see if field is filled.
2788:
2789: =cut
2790:
2791: ######################################################################
2792: ######################################################################
2793: sub filled {
2794: my ($field)=@_;
2795: if ($field=~/\S/ && $field ne 'any') {
2796: return 1;
2797: }
2798: else {
2799: return 0;
2800: }
2801: }
2802:
2803: ######################################################################
2804: ######################################################################
2805:
2806: =pod
2807:
2808: =item &output_blank_field_error()
2809:
2810: Output a complete page that indicates the user has not filled in enough
2811: information to do a search.
2812:
2813: Inputs: $r (Apache request handle), $closebutton, $parms.
2814:
2815: Returns: nothing
2816:
2817: $parms is extra information to include in the 'Revise search request' link.
2818:
2819: =cut
2820:
2821: ######################################################################
2822: ######################################################################
2823: sub output_blank_field_error {
2824: my ($r,$closebutton,$parms)=@_;
2825: # make query information persistent to allow for subsequent revision
2826: $r->print(<<BEGINNING);
2827: <html>
2828: <head>
2829: <title>The LearningOnline Network with CAPA</title>
2830: BEGINNING
2831: $r->print(<<RESULTS);
2832: </head>
2833: <body bgcolor="#ffffff">
2834: <img align='right' src='/adm/lonIcons/lonlogos.gif' />
2835: <h1>Search Catalog</h1>
2836: <form method="post" action="/adm/searchcat">
2837: $hidden_fields
2838: <a href="/adm/searchcat?$parms&persistent_db_id=$ENV{'form.persistent_db_id'}"
2839: >Revise search request</a>
2840: $closebutton
2841: <hr />
2842: <h3>Unactionable search query.</h3>
2843: <p>
2844: You did not fill in enough information for the search to be started.
2845: You need to fill in relevant fields on the search page in order
2846: for a query to be processed.
2847: </p>
2848: </body>
2849: </html>
2850: RESULTS
2851: }
2852:
2853: ######################################################################
2854: ######################################################################
2855:
2856: =pod
2857:
2858: =item &output_date_error()
2859:
2860: Output a full html page with an error message.
2861:
2862: Inputs:
2863:
2864: $r, the request pointer.
2865: $message, the error message for the user.
2866: $closebutton, the specialized close button needed for groupsearch.
2867:
2868: =cut
2869:
2870: ######################################################################
2871: ######################################################################
2872: sub output_date_error {
2873: my ($r,$message,$closebutton)=@_;
2874: # make query information persistent to allow for subsequent revision
2875: $r->print(<<RESULTS);
2876: <html>
2877: <head>
2878: <title>The LearningOnline Network with CAPA</title>
2879: </head>
2880: <body bgcolor="#ffffff">
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: __END__
2927:
2928: =pod
2929:
2930: =back
2931:
2932: =cut
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