File:
[LON-CAPA] /
loncom /
interface /
lonsearchcat.pm
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Wed Aug 21 17:18:08 2002 UTC (21 years, 9 months ago) by
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Starting to implement common header and color scheme for LON-CAPA handlers
(non-content pages).
Instead of <body bgcolor="#...."><h1>... call
&Apache::loncommon::bodytag(title,[role],[add_body_parms]);
title: what it says in the header
role (OPTIONAL): override role choice
('admin','coordinator','student','author')
add_body_parms: additional parameters to be put into the body tag, for
example 'onLoad="init();" or stuff
Colors and layout will likely change in the future, including domain
customization, help function calls, (css?)
1: # The LearningOnline Network with CAPA
2: # Search Catalog
3: #
4: # $Id: lonsearchcat.pm,v 1.154 2002/08/21 17:18:08 www 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 $r->header_only;
174: ##
175: ## Pick up form fields passed in the links.
176: ##
177: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
178: ['catalogmode','launch','acts','mode','form','element','pause',
179: 'phase','persistent_db_id','table','start','show']);
180: ##
181: ## The following is a trick - we wait a few seconds if asked to so
182: ## the daemon running the search can get ahead of the daemon
183: ## printing the results. We only need (theoretically) to do
184: ## this once, so the pause indicator is deleted
185: ##
186: if (exists($ENV{'form.pause'})) {
187: sleep(3);
188: delete($ENV{'form.pause'});
189: }
190: ##
191: ## Initialize global variables
192: ##
193: my $domain = $r->dir_config('lonDefDomain');
194: $diropendb= "/home/httpd/perl/tmp/".&Apache::lonnet::escape($domain).
195: "\_".&Apache::lonnet::escape($ENV{'user.name'})."_searchcat.db";
196: #
197: # set the name of the persistent database
198: # $ENV{'form.persistent_db_id'} can only have digits in it.
199: if (! exists($ENV{'form.persistent_db_id'}) ||
200: ($ENV{'form.persistent_db_id'} =~ /\D/) ||
201: ($ENV{'form.launch'} eq '1')) {
202: $ENV{'form.persistent_db_id'} = time;
203: }
204: my $persistent_db_file = "/home/httpd/perl/tmp/".
205: &Apache::lonnet::escape($domain).
206: '_'.&Apache::lonnet::escape($ENV{'user.name'}).
207: '_'.$ENV{'form.persistent_db_id'}.'_persistent_search.db';
208: ##
209: if (! &get_persistent_form_data($persistent_db_file)) {
210: if ($ENV{'form.phase'} =~ /(run_search|results)/) {
211: &Apache::lonnet::logthis("lonsearchcat:Unable to recover data ".
212: "from $persistent_db_file");
213: $r->print(<<END);
214: <html>
215: <head><title>LON-CAPA Search Error</title></head>
216: <body>
217: We were unable to retrieve data describing your search. This is a serious
218: error and has been logged. Please alert your LON-CAPA administrator.
219: </body>
220: </html>
221: END
222: return OK;
223: }
224: }
225: ##
226: ## Clear out old values from groupsearch database
227: ##
228: untie %groupsearch_db if (tied(%groupsearch_db));
229: if ($ENV{'form.launch'} eq '1' &&
230: ($ENV{'form.catalogmode'} eq 'groupsearch') &&
231: ($ENV{'form.phase'} eq 'results')) {
232: if (tie(%groupsearch_db,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
233: &start_fresh_session();
234: untie %groupsearch_db;
235: } else {
236: $r->print('<html><head></head><body>Unable to tie hash to db '.
237: 'file</body></html>');
238: return OK;
239: }
240: }
241: ##
242: ## Configure hidden fields
243: ##
244: $hidden_fields = '<input type="hidden" name="persistent_db_id" value="'.
245: $ENV{'form.persistent_db_id'}.'" />'."\n";
246: if (exists($ENV{'form.catalogmode'})) {
247: $hidden_fields .= '<input type="hidden" name="catalogmode" value="'.
248: $ENV{'form.catalogmode'}.'" />'."\n";
249: }
250: if (exists($ENV{'form.form'})) {
251: $hidden_fields .= '<input type="hidden" name="form" value="'.
252: $ENV{'form.form'}.'" />'."\n";
253: }
254: if (exists($ENV{'form.element'})) {
255: $hidden_fields .= '<input type="hidden" name="element" value="'.
256: $ENV{'form.element'}.'" />'."\n";
257: }
258: if (exists($ENV{'form.mode'})) {
259: $hidden_fields .= '<input type="hidden" name="mode" value="'.
260: $ENV{'form.mode'}.'" />'."\n";
261: }
262: ##
263: ## Configure dynamic components of interface
264: ##
265: if ($ENV{'form.catalogmode'} eq 'interactive') {
266: $closebutton="<input type='button' name='close' value='CLOSE' ";
267: if ($ENV{'form.phase'} =~ /(results|run_search)/) {
268: $closebutton .="onClick='parent.close()'";
269: } else {
270: $closebutton .="onClick='self.close()'";
271: }
272: $closebutton .=">\n";
273: } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') {
274: $closebutton="<input type='button' name='close' value='CLOSE' ";
275: if ($ENV{'form.phase'} =~ /(results|run_search)/) {
276: $closebutton .="onClick='parent.close()'";
277: } else {
278: $closebutton .="onClick='self.close()'";
279: }
280: $closebutton .= ">";
281: $importbutton=<<END;
282: <input type='button' name='import' value='IMPORT'
283: onClick='javascript:select_group()'>
284: END
285: } else {
286: $closebutton = '';
287: $importbutton = '';
288: }
289: ##
290: ## Sanity checks on form elements
291: ##
292: if (!defined($ENV{'form.viewselect'})) {
293: if (($ENV{'form.catalogmode'} eq 'groupsearch') ||
294: ($ENV{'form.catalogmode'} eq 'interactive')) {
295: $ENV{'form.viewselect'} ="Compact View";
296: } else {
297: $ENV{'form.viewselect'} ="Detailed Citation View";
298: }
299: }
300: $ENV{'form.phase'} = 'disp_basic' if (! exists($ENV{'form.phase'}));
301: $ENV{'form.show'} = 20 if (! exists($ENV{'form.show'}));
302: ##
303: ## Switch on the phase
304: ##
305: if ($ENV{'form.phase'} eq 'disp_basic') {
306: &print_basic_search_form($r,$closebutton);
307: } elsif ($ENV{'form.phase'} eq 'disp_adv') {
308: &print_advanced_search_form($r,$closebutton);
309: } elsif ($ENV{'form.phase'} eq 'results') {
310: &display_results($r,$importbutton,$closebutton);
311: } elsif ($ENV{'form.phase'} =~ /^(sort|run_search)$/) {
312: my ($query,$customquery,$customshow,$libraries,$pretty_string) =
313: &get_persistent_data($persistent_db_file,
314: ['query','customquery','customshow',
315: 'libraries','pretty_string']);
316: if ($ENV{'form.phase'} eq 'sort') {
317: &print_sort_form($r,$pretty_string);
318: } elsif ($ENV{'form.phase'} eq 'run_search') {
319: &run_search($r,$query,$customquery,$customshow,
320: $libraries,$pretty_string);
321: }
322: } elsif(($ENV{'form.phase'} eq 'basic_search') ||
323: ($ENV{'form.phase'} eq 'adv_search')) {
324: $ENV{'form.searchmode'} = 'basic';
325: if ($ENV{'form.phase'} eq 'adv_search') {
326: $ENV{'form.searchmode'} = 'advanced';
327: }
328: # Set up table
329: if (! defined(&create_results_table())) {
330: $r->print(<<END);
331: <html><head><title>Search Error</title></head>
332: <body>
333: Unable to create table in which to store search results.
334: The search has been aborted.
335: </body>
336: </html>
337: END
338: return OK;
339: }
340: delete($ENV{'form.launch'});
341: if (! &make_form_data_persistent($r,$persistent_db_file)) {
342: $r->print(<<END);
343: <html><head><title>Search Error</title></head>
344: <body>
345: Unable to properly store search information. The search has been aborted.
346: </body>
347: </html>
348: END
349: return OK;
350: }
351: #
352: # We are running a search
353: my ($query,$customquery,$customshow,$libraries) =
354: (undef,undef,undef,undef);
355: my $pretty_string;
356: if ($ENV{'form.phase'} eq 'basic_search') {
357: ($query,$pretty_string) = &parse_basic_search($r,$closebutton);
358: } else { # Advanced search
359: ($query,$customquery,$customshow,$libraries,$pretty_string)
360: = &parse_advanced_search($r,$closebutton);
361: return OK if (! defined($query));
362: }
363: &make_persistent({ query => $query,
364: customquery => $customquery,
365: customshow => $customshow,
366: libraries => $libraries,
367: pretty_string => $pretty_string },
368: $persistent_db_file);
369: ##
370: ## Print out the frames interface
371: ##
372: &print_frames_interface($r);
373: }
374: return OK;
375: }
376:
377: ######################################################################
378: ######################################################################
379:
380: =pod
381:
382: =item &print_basic_search_form()
383:
384: Returns a scalar which holds html for the basic search form.
385:
386: =cut
387:
388: ######################################################################
389: ######################################################################
390:
391: sub print_basic_search_form{
392: my ($r,$closebutton) = @_;
393: my $bodytag=&Apache::loncommon::bodytag('Catalog Search');
394: my $scrout=<<"ENDDOCUMENT";
395: <html>
396: <head>
397: <title>The LearningOnline Network with CAPA</title>
398: <script type="text/javascript">
399: function openhelp(val) {
400: openhelpwin=open('/adm/help/searchcat.html','helpscreen',
401: 'scrollbars=1,width=600,height=300');
402: openhelpwin.focus();
403: }
404: </script>
405: </head>
406: $bodytag
407: <form method="post" action="/adm/searchcat">
408: <input type="hidden" name="phase" value="basic_search" />
409: $hidden_fields
410: <p>
411: Enter terms or phrases separated by AND, OR, or NOT
412: then press SEARCH below.
413: </p>
414: <p>
415: <table>
416: <tr><td>
417: ENDDOCUMENT
418: $scrout.=' '.&simpletextfield('basicexp',$ENV{'form.basicexp'},40).
419: ' ';
420: my $checkbox = &simplecheckbox('related',$ENV{'form.related'});
421: $scrout.=<<END;
422: </td><td><a href="/adm/searchcat?phase=disp_adv">Advanced Search</a></td></tr>
423: <tr><td>$checkbox use related words</td><td></td></tr>
424: </table>
425: </p>
426: <p>
427: <input type="submit" name="basicsubmit" value='SEARCH' />
428: $closebutton
429: END
430: $scrout.=&selectbox(undef,'viewselect',
431: $ENV{'form.viewselect'},
432: undef,undef,undef,
433: sort(keys(%Views)));
434: $scrout.=&selectbox(undef,'show',
435: $ENV{'form.show'},
436: undef,undef,undef,
437: (10,20,50,100));
438: $scrout.=<<ENDDOCUMENT;
439: per page.
440: </p>
441: </form>
442: </body>
443: </html>
444: ENDDOCUMENT
445: $r->print($scrout);
446: return;
447: }
448: ######################################################################
449: ######################################################################
450:
451: =pod
452:
453: =item &advanced_search_form()
454:
455: Returns a scalar which holds html for the advanced search form.
456:
457: =cut
458:
459: ######################################################################
460: ######################################################################
461:
462: sub print_advanced_search_form{
463: my ($r,$closebutton) = @_;
464: my $advanced_buttons = <<"END";
465: <p>
466: <input type="submit" name="advancedsubmit" value='SEARCH' />
467: <input type="reset" name="reset" value='RESET' />
468: $closebutton
469: <input type="button" value="HELP" onClick="openhelp()" />
470: </p>
471: END
472: if (!defined($ENV{'form.viewselect'})) {
473: $ENV{'form.viewselect'} ="Detailed Citation View";
474: }
475: my $bodytag=&Apache::loncommon::bodytag('Advanced Catalog Search');
476: my $scrout=<<"ENDHEADER";
477: <html>
478: <head>
479: <title>The LearningOnline Network with CAPA</title>
480: <script type="text/javascript">
481: function openhelp(val) {
482: openhelpwin=open('/adm/help/searchcat.html','helpscreen',
483: 'scrollbars=1,width=600,height=300');
484: openhelpwin.focus();
485: }
486: </script>
487: </head>
488: $bodytag
489: Enter terms or phrases separated by search operators
490: such as AND, OR, or NOT.<br />
491: <form method="post" action="/adm/searchcat">
492: $advanced_buttons
493: $hidden_fields
494: <input type="hidden" name="phase" value="adv_search" />
495: <table>
496: <tr><td><font color="#800000" face="helvetica"><b>VIEW:</b></font></td>
497: <td>
498: ENDHEADER
499: $scrout.=&selectbox(undef,'viewselect',
500: $ENV{'form.viewselect'},
501: undef,undef,undef,
502: sort(keys(%Views)));
503: $scrout.=' ';
504: $scrout.=&selectbox(undef,'show',
505: $ENV{'form.show'},
506: undef,undef,undef,
507: (10,20,50,100));
508: $scrout.=' '.
509: '<font color="#800000" face="helvetica">Per Page</font>';
510: $scrout.="</td><td>Related<br />Words</td></tr>\n";
511: $scrout.=&searchphrasefield_with_related('title', 'title' ,
512: $ENV{'form.title'});
513: $scrout.=&searchphrasefield('author', 'author' ,$ENV{'form.author'});
514: $scrout.=&searchphrasefield_with_related('subject', 'subject' ,
515: $ENV{'form.subject'});
516: $scrout.=&searchphrasefield_with_related('keywords','keywords',
517: $ENV{'form.keywords'});
518: $scrout.=&searchphrasefield('URL', 'url' ,$ENV{'form.url'});
519: $scrout.=&searchphrasefield_with_related('notes', 'notes' ,
520: $ENV{'form.notes'});
521: $scrout.=&searchphrasefield_with_related('abstract','abstract',
522: $ENV{'form.abstract'});
523: # Hack - an empty table row.
524: $scrout.="<tr><td> </td><td> </td><td> </td></tr>\n";
525: $scrout.=&searchphrasefield('file<br />extension','mime',
526: $ENV{'form.mime'});
527: $scrout.="<tr><td> </td><td> </td><td> </td></tr>\n";
528: $scrout.=&searchphrasefield('publisher<br />owner','owner',
529: $ENV{'form.owner'});
530: $scrout.="</table>\n";
531: $ENV{'form.category'}='any' unless length($ENV{'form.category'});
532: $scrout.=&selectbox('File Category','category',
533: $ENV{'form.category'},
534: 'any','Any category',
535: undef,
536: (&Apache::loncommon::filecategories()));
537: $ENV{'form.language'}='any' unless length($ENV{'form.language'});
538: #----------------------------------------------------------------
539: # Allow restriction to multiple domains.
540: # I make the crazy assumption that there will never be a domain 'any'.
541: #
542: $ENV{'form.domains'} = 'any' if (! exists($ENV{'form.domains'}));
543: my @allowed_domains = (ref($ENV{'form.domains'}) ? @{$ENV{'form.domains'}}
544: : ($ENV{'form.domains'}) );
545: my %domain_hash = ();
546: foreach (@allowed_domains) {
547: $domain_hash{$_}++;
548: }
549: my @domains =&Apache::loncommon::get_domains();
550: # adjust the size of the select box
551: my $size = 4;
552: my $size = (scalar @domains < ($size - 1) ? scalar @domains + 1 : $size);
553: $scrout.="\n".'<font color="#800000" face="helvetica"><b>'.
554: 'DOMAINS</b></font><br />'.
555: '<select name="domains" size="'.$size.'" multiple>'."\n".
556: '<option name="any" value="any" '.
557: ($domain_hash{'any'}? 'selected ' :'').
558: '>all domains</option>'."\n";
559: foreach my $dom (sort @domains) {
560: $scrout.="<option name=\"$dom\" ".
561: ($domain_hash{$dom} ? 'selected ' :'').">$dom</option>\n";
562: }
563: $scrout.="</select>\n";
564: #----------------------------------------------------------------
565: $scrout.=&selectbox('Limit by language','language',
566: $ENV{'form.language'},'any','Any Language',
567: \&{Apache::loncommon::languagedescription},
568: (&Apache::loncommon::languageids),
569: );
570: # ------------------------------------------------ Compute date selection boxes
571: $scrout.=<<CREATIONDATESTART;
572: <p>
573: <font color="#800000" face="helvetica"><b>LIMIT BY CREATION DATE RANGE:</b>
574: </font>
575: <br />
576: between:
577: CREATIONDATESTART
578: $scrout.=&dateboxes('creationdatestart',1,1,1976,
579: $ENV{'form.creationdatestart_month'},
580: $ENV{'form.creationdatestart_day'},
581: $ENV{'form.creationdatestart_year'},
582: );
583: $scrout.="and:\n";
584: $scrout.=&dateboxes('creationdateend',12,31,2051,
585: $ENV{'form.creationdateend_month'},
586: $ENV{'form.creationdateend_day'},
587: $ENV{'form.creationdateend_year'},
588: );
589: $scrout.="</p>";
590: $scrout.=<<LASTREVISIONDATESTART;
591: <p>
592: <font color="#800000" face="helvetica"><b>LIMIT BY LAST REVISION DATE RANGE:
593: </b></font>
594: <br />between:
595: LASTREVISIONDATESTART
596: $scrout.=&dateboxes('lastrevisiondatestart',1,1,1976,
597: $ENV{'form.lastrevisiondatestart_month'},
598: $ENV{'form.lastrevisiondatestart_day'},
599: $ENV{'form.lastrevisiondatestart_year'},
600: );
601: $scrout.=<<LASTREVISIONDATEEND;
602: and:
603: LASTREVISIONDATEEND
604: $scrout.=&dateboxes('lastrevisiondateend',12,31,2051,
605: $ENV{'form.lastrevisiondateend_month'},
606: $ENV{'form.lastrevisiondateend_day'},
607: $ENV{'form.lastrevisiondateend_year'},
608: );
609: $scrout.='</p>';
610: $ENV{'form.copyright'}='any' unless length($ENV{'form.copyright'});
611: $scrout.=&selectbox('Limit by copyright/distribution','copyright',
612: $ENV{'form.copyright'},
613: 'any','Any copyright/distribution',
614: \&{Apache::loncommon::copyrightdescription},
615: (&Apache::loncommon::copyrightids),
616: );
617: # ------------------------------------------- Compute customized metadata field
618: # $scrout.=<<CUSTOMMETADATA;
619: #<p>
620: #<font color="#800000" face="helvetica"><b>LIMIT BY SPECIAL METADATA FIELDS:</b>
621: #</font>
622: #For resource-specific metadata, enter in an expression in the form of
623: #<i>key</i>=<i>value</i> separated by operators such as AND, OR or NOT.<br />
624: #<b>Example:</b> grandmother=75 OR grandfather=85
625: #<br />
626: #CUSTOMMETADATA
627: # $scrout.=&simpletextfield('custommetadata',$ENV{'form.custommetadata'});
628: # $scrout.=<<CUSTOMSHOW;
629: #<p>
630: #<font color="#800000" face="helvetica"><b>SHOW SPECIAL METADATA FIELDS:</b>
631: #</font>
632: #Enter in a space-separated list of special metadata fields to show
633: #in a fielded listing for each record result.
634: #<br />
635: #CUSTOMSHOW
636: # $scrout.=&simpletextfield('customshow',$ENV{'form.customshow'});
637: $scrout.=<<ENDDOCUMENT;
638: $advanced_buttons
639: </form>
640: </body>
641: </html>
642: ENDDOCUMENT
643: $r->print($scrout);
644: return;
645: }
646:
647: ######################################################################
648: ######################################################################
649:
650: =pod
651:
652: =item &get_persistent_form_data
653:
654: Inputs: filename of database
655:
656: Outputs: returns undef on database errors.
657:
658: This function is the reverse of &make_persistent() for form data.
659: Retrieve persistent data from %persistent_db. Retrieved items will have their
660: values unescaped. If a form value already exists in $ENV, it will not be
661: overwritten. Form values that are array references may have values appended
662: to them.
663:
664: =cut
665:
666: ######################################################################
667: ######################################################################
668: sub get_persistent_form_data {
669: my $filename = shift;
670: return 0 if (! -e $filename);
671: return undef if (! tie(%persistent_db,'GDBM_File',$filename,
672: &GDBM_READER(),0640));
673: #
674: # These make sure we do not get array references printed out as 'values'.
675: my %arrays_allowed = ('form.category'=>1,'form.domains'=>1);
676: #
677: # Loop through the keys, looking for 'form.'
678: foreach my $name (keys(%persistent_db)) {
679: next if ($name !~ /^form./);
680: next if (exists($ENV{$name}));
681: my @values = map {
682: &Apache::lonnet::unescape($_);
683: } split(',',$persistent_db{$name});
684: next if (@values <1);
685: if ($arrays_allowed{$name}) {
686: $ENV{$name} = [@values];
687: } else {
688: $ENV{$name} = $values[0] if ($values[0]);
689: }
690: }
691: untie (%persistent_db);
692: return 1;
693: }
694: ######################################################################
695: ######################################################################
696:
697: =pod
698:
699: =item &get_persistent_data
700:
701: Inputs: filename of database, ref to array of values to recover.
702:
703: Outputs: array of values. Returns undef on error.
704:
705: This function is the reverse of &make_persistent();
706: Retrieve persistent data from %persistent_db. Retrieved items will have their
707: values unescaped. If the item contains commas (before unescaping), the
708: returned value will be an array pointer.
709:
710: =cut
711:
712: ######################################################################
713: ######################################################################
714: sub get_persistent_data {
715: my $filename = shift;
716: my @Vars = @{shift()};
717: my @Values; # Return array
718: return undef if (! -e $filename);
719: return undef if (! tie(%persistent_db,'GDBM_File',$filename,
720: &GDBM_READER(),0640));
721: foreach my $name (@Vars) {
722: if (! exists($persistent_db{$name})) {
723: push @Values, undef;
724: next;
725: }
726: my @values = map {
727: &Apache::lonnet::unescape($_);
728: } split(',',$persistent_db{$name});
729: if (@values <= 1) {
730: push @Values,$values[0];
731: } else {
732: push @Values,\@values;
733: }
734: }
735: untie (%persistent_db);
736: return @Values;
737: }
738:
739: ######################################################################
740: ######################################################################
741:
742: =pod
743:
744: =item &make_persistent()
745:
746: Inputs: Hash of values to save, filename of persistent database.
747:
748: Store variables away to the %persistent_db.
749: Values will be escaped. Values that are array pointers will have their
750: elements escaped and concatenated in a comma seperated string.
751:
752: =cut
753:
754: ######################################################################
755: ######################################################################
756: sub make_persistent {
757: my %save = %{shift()};
758: my $filename = shift;
759: return undef if (! tie(%persistent_db,'GDBM_File',
760: $filename,&GDBM_WRCREAT(),0640));
761: foreach my $name (keys(%save)) {
762: my @values = (ref($save{$name}) ? @{$save{$name}} : ($save{$name}));
763: # We handle array references, but not recursively.
764: my $store = join(',', map { &Apache::lonnet::escape($_); } @values );
765: $persistent_db{$name} = $store;
766: }
767: untie(%persistent_db);
768: return 1;
769: }
770:
771: ######################################################################
772: ######################################################################
773:
774: =pod
775:
776: =item &make_form_data_persistent()
777:
778: Inputs: filename of persistent database.
779:
780: Store most form variables away to the %persistent_db.
781: Values will be escaped. Values that are array pointers will have their
782: elements escaped and concatenated in a comma seperated string.
783:
784: =cut
785:
786: ######################################################################
787: ######################################################################
788: sub make_form_data_persistent {
789: my $r = shift;
790: my $filename = shift;
791: my %save;
792: foreach (keys(%ENV)) {
793: next if (!/^form/ || /submit/);
794: $save{$_} = $ENV{$_};
795: }
796: return &make_persistent(\%save,$filename);
797: }
798:
799: ######################################################################
800: # HTML form building functions #
801: ######################################################################
802:
803: =pod
804:
805: =item HTML form building functions
806:
807: =over 4
808:
809: =cut
810:
811: ###############################################
812: ###############################################
813:
814: =pod
815:
816: =item &simpletextfield()
817:
818: Inputs: $name,$value,$size
819:
820: Returns a text input field with the given name, value, and size.
821: If size is not specified, a value of 20 is used.
822:
823: =cut
824:
825: ###############################################
826: ###############################################
827:
828: sub simpletextfield {
829: my ($name,$value,$size)=@_;
830: $size = 20 if (! defined($size));
831: return '<input type="text" name="'.$name.
832: '" size="'.$size.'" value="'.$value.'" />';
833: }
834:
835: ###############################################
836: ###############################################
837:
838: =pod
839:
840: =item &simplecheckbox()
841:
842: Inputs: $name,$value
843:
844: Returns a simple check box with the given $name.
845: If $value eq 'on' the box is checked.
846:
847: =cut
848:
849: ###############################################
850: ###############################################
851:
852: sub simplecheckbox {
853: my ($name,$value)=@_;
854: my $checked='';
855: $checked="checked" if $value eq 'on';
856: return '<input type="checkbox" name="'.$name.'" '. $checked . ' />';
857: }
858:
859: ###############################################
860: ###############################################
861:
862: =pod
863:
864: =item &fieldtitle()
865:
866: Input: $title
867:
868: Returns a scalar with html which will display $title as a search
869: field heading.
870:
871: =cut
872:
873: ###############################################
874: ###############################################
875:
876: sub fieldtitle {
877: my $title = uc(shift());
878: return '<font color="#800000" face="helvetica"><b>'.$title.
879: ': </b></font>';
880: }
881:
882: ###############################################
883: ###############################################
884:
885: =pod
886:
887: =item &searchphrasefield()
888:
889: Inputs: $title,$name,$value
890:
891: Returns html for a title line and an input field for entering search terms.
892: The entry field (which is where the $name and $value are used) is a 50 column
893: simpletextfield. The html returned is for a row in a three column table.
894:
895: =cut
896:
897: ###############################################
898: ###############################################
899:
900: sub searchphrasefield {
901: my ($title,$name,$value)=@_;
902: return '<tr><td>'.&fieldtitle($title).'</td><td>'.
903: &simpletextfield($name,$value,50)."</td><td> </td></tr>\n";
904: }
905:
906: ###############################################
907: ###############################################
908:
909: =pod
910:
911: =item &searchphrasefield_with_related()
912:
913: Inputs: $title,$name,$value
914:
915: Returns html for a title line and an input field for entering search terms
916: and a check box for 'related words'. The entry field (which is where the
917: $name and $value are used) is a 50 column simpletextfield. The name of
918: the related words checkbox is "$name_related".
919:
920: =cut
921:
922: ###############################################
923: ###############################################
924:
925: sub searchphrasefield_with_related {
926: my ($title,$name,$value)=@_;
927: return '<tr><td>'.&fieldtitle($title).'</td><td>'.
928: &simpletextfield($name,$value,50).'</td><td align="center"> '.
929: &simplecheckbox($name.'_related',$ENV{'form.'.$name.'_related'}).
930: " </td></tr>\n";
931: }
932:
933: ###############################################
934: ###############################################
935:
936: =pod
937:
938: =item &dateboxes()
939:
940: Returns html selection form elements for the specification of
941: the day, month, and year.
942:
943: =cut
944:
945: ###############################################
946: ###############################################
947:
948: sub dateboxes {
949: my ($name,$defaultmonth,$defaultday,$defaultyear,
950: $currentmonth,$currentday,$currentyear)=@_;
951: ($defaultmonth,$defaultday,$defaultyear)=('','','');
952: #
953: # Day
954: my $day=<<END;
955: <select name="${name}_day">
956: <option value='$defaultday'> </option>
957: END
958: for (my $i = 1; $i<=31; $i++) {
959: $day.="<option value=\"$i\">$i</option>\n";
960: }
961: $day.="</select>\n";
962: $day=~s/(\"$currentday\")/$1 SELECTED/ if length($currentday);
963: #
964: # Month
965: my $month=<<END;
966: <select name="${name}_month">
967: <option value='$defaultmonth'> </option>
968: END
969: my $i = 1;
970: foreach (qw/January February March April May June
971: July August September October November December /){
972: $month .="<option value=\"$i\">$_</option>\n";
973: $i++;
974: }
975: $month.="</select>\n";
976: $month=~s/(\"$currentmonth\")/$1 SELECTED/ if length($currentmonth);
977: #
978: # Year (obviously)
979: my $year=<<END;
980: <select name="${name}_year">
981: <option value='$defaultyear'> </option>
982: END
983: my $maxyear = 2051;
984: for (my $i = 1976; $i<=$maxyear; $i++) {
985: $year.="<option value=\"$i\">$i</option>\n";
986: }
987: $year.="</select>\n";
988: $year=~s/(\"$currentyear\")/$1 SELECTED/ if length($currentyear);
989: return "$month$day$year";
990: }
991:
992: ###############################################
993: ###############################################
994:
995: =pod
996:
997: =item &selectbox()
998:
999: Returns a scalar containing an html <select> form.
1000:
1001: Inputs:
1002:
1003: =over 4
1004:
1005: =item $title
1006:
1007: Printed above the select box, in uppercase. If undefined, only a select
1008: box will be returned, with no additional html.
1009:
1010: =item $name
1011:
1012: The name element of the <select> tag.
1013:
1014: =item $default
1015:
1016: The default value of the form. Can be $anyvalue, or in @idlist.
1017:
1018: =item $anyvalue
1019:
1020: The <option value="..."> used to indicate a default of
1021: none of the values. Can be undef.
1022:
1023: =item $anytag
1024:
1025: The text associate with $anyvalue above.
1026:
1027: =item $functionref
1028:
1029: Each element in @idlist will be passed as a parameter
1030: to the function referenced here. The return value of the function should
1031: be a scalar description of the items. If this value is undefined the
1032: description of each item in @idlist will be the item name.
1033:
1034: =item @idlist
1035:
1036: The items to be selected from. One of these or $anyvalue will be the
1037: value returned by the form element, $ENV{form.$name}.
1038:
1039: =back
1040:
1041: =cut
1042:
1043: ###############################################
1044:
1045: sub selectbox {
1046: my ($title,$name,$default,$anyvalue,$anytag,$functionref,@idlist)=@_;
1047: if (! defined($functionref)) { $functionref = sub { $_[0]}; }
1048: my $selout='';
1049: if (defined($title)) {
1050: my $uctitle=uc($title);
1051: $selout="\n".'<p><font color="#800000" face="helvetica">'.
1052: '<b>'.$uctitle.': </b></font>';
1053: }
1054: $selout .= '<select name="'.$name.'">';
1055: unshift @idlist,$anyvalue if (defined($anyvalue));
1056: foreach (@idlist) {
1057: $selout.='<option value="'.$_.'"';
1058: if ($_ eq $default and !/^any$/) {
1059: $selout.=' selected >'.&{$functionref}($_).'</option>';
1060: }
1061: elsif ($_ eq $default and /^$anyvalue$/) {
1062: $selout.=' selected >'.$anytag.'</option>';
1063: }
1064: else {$selout.='>'.&{$functionref}($_).'</option>';}
1065: }
1066: return $selout.'</select>'.(defined($title)?'</p>':' ');
1067: }
1068:
1069: ######################################################################
1070: # End of HTML form building functions #
1071: ######################################################################
1072:
1073: =pod
1074:
1075: =back
1076:
1077: =cut
1078:
1079:
1080: ######################################################################
1081: ######################################################################
1082:
1083: =pod
1084:
1085: =item &parse_advanced_search()
1086:
1087: Parse advanced search form and return the following:
1088:
1089: =over 4
1090:
1091: =item $query Scalar containing an SQL query.
1092:
1093: =item $customquery Scalar containing a custom query.
1094:
1095: =item $customshow Scalar containing commands to show custom metadata.
1096:
1097: =item $libraries_to_query Reference to array of domains to search.
1098:
1099: =back
1100:
1101: =cut
1102:
1103: ######################################################################
1104: ######################################################################
1105: sub parse_advanced_search {
1106: my ($r,$closebutton)=@_;
1107: my $fillflag=0;
1108: my $pretty_search_string = "<br />\n";
1109: # Clean up fields for safety
1110: for my $field ('title','author','subject','keywords','url','version',
1111: 'creationdatestart_month','creationdatestart_day',
1112: 'creationdatestart_year','creationdateend_month',
1113: 'creationdateend_day','creationdateend_year',
1114: 'lastrevisiondatestart_month','lastrevisiondatestart_day',
1115: 'lastrevisiondatestart_year','lastrevisiondateend_month',
1116: 'lastrevisiondateend_day','lastrevisiondateend_year',
1117: 'notes','abstract','mime','language','owner',
1118: 'custommetadata','customshow','category') {
1119: $ENV{"form.$field"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1120: }
1121: foreach ('mode','form','element') {
1122: # is this required? Hmmm.
1123: next unless (exists($ENV{"form.$_"}));
1124: $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"});
1125: $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1126: }
1127: # Preprocess the category form element.
1128: $ENV{'form.category'} = 'any' if (ref($ENV{'form.category'}));
1129: if ($ENV{'form.category'} ne 'any') {
1130: my @extensions = &Apache::loncommon::filecategorytypes
1131: ($ENV{'form.category'});
1132: $ENV{'form.mime'} = join ' OR ',@extensions;
1133: }
1134: # Check to see if enough information was filled in
1135: for my $field ('title','author','subject','keywords','url','version',
1136: 'notes','abstract','mime','language','owner',
1137: 'custommetadata') {
1138: if (&filled($ENV{"form.$field"})) {
1139: $fillflag++;
1140: }
1141: }
1142: unless ($fillflag) {
1143: &output_blank_field_error($r,$closebutton,'phase=disp_adv');
1144: return ;
1145: }
1146: # Turn the form input into a SQL-based query
1147: my $query='';
1148: my @queries;
1149: my $font = '<font color="#800000" face="helvetica">';
1150: # Evaluate logical expression AND/OR/NOT phrase fields.
1151: foreach my $field ('title','author','subject','notes','abstract','url',
1152: 'keywords','version','owner','mime') {
1153: if ($ENV{'form.'.$field}) {
1154: my $searchphrase = $ENV{'form.'.$field};
1155: $pretty_search_string .= $font."$field</font> contains <b>".
1156: $searchphrase."</b>";
1157: if ($ENV{'form.'.$field.'_related'}) {
1158: my @New_Words;
1159: ($searchphrase,@New_Words) = &related_version($searchphrase);
1160: if (@New_Words) {
1161: $pretty_search_string .= " with related words: ".
1162: "<b>@New_Words</b>.";
1163: } else {
1164: $pretty_search_string .= " with no related words.";
1165: }
1166: }
1167: $pretty_search_string .= "<br />\n";
1168: push @queries,&build_SQL_query($field,$searchphrase);
1169: }
1170: }
1171: # I dislike the hack below.
1172: if ($ENV{'form.category'}) {
1173: $ENV{'form.mime'}='';
1174: }
1175: # Evaluate option lists
1176: if ($ENV{'form.language'} and $ENV{'form.language'} ne 'any') {
1177: push @queries,"(language like \"$ENV{'form.language'}\")";
1178: $pretty_search_string.=$font."language</font>= ".
1179: &Apache::loncommon::languagedescription($ENV{'form.language'}).
1180: "<br />\n";
1181: }
1182: if ($ENV{'form.copyright'} and $ENV{'form.copyright'} ne 'any') {
1183: push @queries,"(copyright like \"$ENV{'form.copyright'}\")";
1184: $pretty_search_string.=$font."copyright</font> = ".
1185: &Apache::loncommon::copyrightdescription($ENV{'form.copyright'}).
1186: "<br \>\n";
1187: }
1188: #
1189: # Evaluate date windows
1190: my $datequery=&build_date_queries(
1191: $ENV{'form.creationdatestart_month'},
1192: $ENV{'form.creationdatestart_day'},
1193: $ENV{'form.creationdatestart_year'},
1194: $ENV{'form.creationdateend_month'},
1195: $ENV{'form.creationdateend_day'},
1196: $ENV{'form.creationdateend_year'},
1197: $ENV{'form.lastrevisiondatestart_month'},
1198: $ENV{'form.lastrevisiondatestart_day'},
1199: $ENV{'form.lastrevisiondatestart_year'},
1200: $ENV{'form.lastrevisiondateend_month'},
1201: $ENV{'form.lastrevisiondateend_day'},
1202: $ENV{'form.lastrevisiondateend_year'},
1203: );
1204: # Test to see if date windows are legitimate
1205: if ($datequery=~/^Incorrect/) {
1206: &output_date_error($r,$datequery,$closebutton);
1207: return ;
1208: } elsif ($datequery) {
1209: # Here is where you would set up pretty_search_string to output
1210: # date query information.
1211: push @queries,$datequery;
1212: }
1213: # Process form information for custom metadata querying
1214: my $customquery=undef;
1215: # if ($ENV{'form.custommetadata'}) {
1216: # $pretty_search_string .=$font."Custom Metadata Search</font>: <b>".
1217: # $ENV{'form.custommetadata'}."</b><br />\n";
1218: # $customquery=&build_custommetadata_query('custommetadata',
1219: # $ENV{'form.custommetadata'});
1220: # }
1221: my $customshow=undef;
1222: # if ($ENV{'form.customshow'}) {
1223: # $pretty_search_string .=$font."Custom Metadata Display</font>: <b>".
1224: # $ENV{'form.customshow'}."</b><br />\n";
1225: # $customshow=$ENV{'form.customshow'};
1226: # $customshow=~s/[^\w\s]//g;
1227: # my @fields=split(/\s+/,$customshow);
1228: # $customshow=join(" ",@fields);
1229: # }
1230: ## ---------------------------------------------------------------
1231: ## Deal with restrictions to given domains
1232: ##
1233: my $libraries_to_query = undef;
1234: # $ENV{'form.domains'} can be either a scalar or an array reference.
1235: # We need an array.
1236: my @allowed_domains = (ref($ENV{'form.domains'}) ? @{$ENV{'form.domains'}}
1237: : ($ENV{'form.domains'}) );
1238: my %domain_hash = ();
1239: my $pretty_domains_string;
1240: foreach (@allowed_domains) {
1241: $domain_hash{$_}++;
1242: }
1243: if ($domain_hash{'any'}) {
1244: $pretty_domains_string = "In all LON-CAPA domains.";
1245: } else {
1246: if (@allowed_domains > 1) {
1247: $pretty_domains_string = "In LON-CAPA domains:";
1248: } else {
1249: $pretty_domains_string = "In LON-CAPA domain ";
1250: }
1251: foreach (sort @allowed_domains) {
1252: $pretty_domains_string .= "<b>".$_."</b> ";
1253: }
1254: foreach (keys(%Apache::lonnet::libserv)) {
1255: if (exists($domain_hash{$Apache::lonnet::hostdom{$_}})) {
1256: push @$libraries_to_query,$_;
1257: }
1258: }
1259: }
1260: $pretty_search_string .= $pretty_domains_string."<br />\n";
1261: #
1262: if (@queries) {
1263: $query=join(" AND ",@queries);
1264: $query="select * from metadata where $query";
1265: } elsif ($customquery) {
1266: $query = '';
1267: }
1268: return ($query,$customquery,$customshow,$libraries_to_query,
1269: $pretty_search_string);
1270: }
1271:
1272: ######################################################################
1273: ######################################################################
1274:
1275: =pod
1276:
1277: =item &parse_basic_search()
1278:
1279: Parse the basic search form and return a scalar containing an sql query.
1280:
1281: =cut
1282:
1283: ######################################################################
1284: ######################################################################
1285: sub parse_basic_search {
1286: my ($r,$closebutton)=@_;
1287: # Clean up fields for safety
1288: for my $field ('basicexp') {
1289: $ENV{"form.$field"}=~s/[^\w\s\(\)\-]//g;
1290: }
1291: foreach ('mode','form','element') {
1292: # is this required? Hmmm.
1293: next unless (exists($ENV{"form.$_"}));
1294: $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"});
1295: $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1296: }
1297:
1298: # Check to see if enough is filled in
1299: unless (&filled($ENV{'form.basicexp'})) {
1300: &output_blank_field_error($r,$closebutton,'phase=disp_basic');
1301: return OK;
1302: }
1303: my $pretty_search_string = '<b>'.$ENV{'form.basicexp'}.'</b>';
1304: my $search_string = $ENV{'form.basicexp'};
1305: if ($ENV{'form.related'}) {
1306: my @New_Words;
1307: ($search_string,@New_Words) = &related_version($ENV{'form.basicexp'});
1308: if (@New_Words) {
1309: $pretty_search_string .= " with related words: <b>@New_Words</b>.";
1310: } else {
1311: $pretty_search_string .= " with no related words.";
1312: }
1313: }
1314: # Build SQL query string based on form page
1315: my $query='';
1316: my $concatarg=join('," ",',
1317: ('title', 'author', 'subject', 'notes', 'abstract',
1318: 'keywords'));
1319: $concatarg='title' if $ENV{'form.titleonly'};
1320: $query=&build_SQL_query('concat('.$concatarg.')',$search_string);
1321: $pretty_search_string .= "<br />\n";
1322: return 'select * from metadata where '.$query,$pretty_search_string;
1323: }
1324:
1325:
1326: ######################################################################
1327: ######################################################################
1328:
1329: =pod
1330:
1331: =item &related_version
1332:
1333: Modifies an input string to include related words. Words in the string
1334: are replaced with parenthesized lists of 'OR'd words. For example
1335: "torque" is replaced with "(torque OR word1 OR word2 OR ...)".
1336:
1337: Note: Using this twice on a string is probably silly.
1338:
1339: =cut
1340:
1341: ######################################################################
1342: ######################################################################
1343: sub related_version {
1344: my $search_string = shift;
1345: my $result = $search_string;
1346: my %New_Words = ();
1347: while ($search_string =~ /(\w+)/cg) {
1348: my $word = $1;
1349: next if (lc($word) =~ /\b(or|and|not)\b/);
1350: my @Words = &Apache::loncommon::get_related_words($word);
1351: @Words = ($#Words>4? @Words[0..4] : @Words);
1352: foreach (@Words) { $New_Words{$_}++;}
1353: my $replacement = join " OR ", ($word,@Words);
1354: $result =~ s/(\b)$word(\b)/$1($replacement)$2/g;
1355: }
1356: return $result,sort(keys(%New_Words));
1357: }
1358:
1359: ######################################################################
1360: ######################################################################
1361:
1362: =pod
1363:
1364: =item &build_SQL_query()
1365:
1366: Builds a SQL query string from a logical expression with AND/OR keywords
1367: using Text::Query and &recursive_SQL_query_builder()
1368:
1369: =cut
1370:
1371: ######################################################################
1372: ######################################################################
1373: sub build_SQL_query {
1374: my ($field_name,$logic_statement)=@_;
1375: my $q=new Text::Query('abc',
1376: -parse => 'Text::Query::ParseAdvanced',
1377: -build => 'Text::Query::Build');
1378: $q->prepare($logic_statement);
1379: my $matchexp=${$q}{'matchexp'}; chomp $matchexp;
1380: my $sql_query=&recursive_SQL_query_build($field_name,$matchexp);
1381: return $sql_query;
1382: }
1383:
1384: ######################################################################
1385: ######################################################################
1386:
1387: =pod
1388:
1389: =item &build_custommetadata_query()
1390:
1391: Constructs a custom metadata query using a rather heinous regular
1392: expression.
1393:
1394: =cut
1395:
1396: ######################################################################
1397: ######################################################################
1398: sub build_custommetadata_query {
1399: my ($field_name,$logic_statement)=@_;
1400: my $q=new Text::Query('abc',
1401: -parse => 'Text::Query::ParseAdvanced',
1402: -build => 'Text::Query::BuildAdvancedString');
1403: $q->prepare($logic_statement);
1404: my $matchexp=${$q}{'-parse'}{'-build'}{'matchstring'};
1405: # quick fix to change literal into xml tag-matching
1406: # will eventually have to write a separate builder module
1407: # wordone=wordtwo becomes\<wordone\>[^\<] *wordtwo[^\<]*\<\/wordone\>
1408: $matchexp =~ s/(\w+)\\=([\w\\\+]+)?# wordone=wordtwo is changed to
1409: /\\<$1\\>?# \<wordone\>
1410: \[\^\\<\]?# [^\<]
1411: \*$2\[\^\\<\]?# *wordtwo[^\<]
1412: \*\\<\\\/$1\\>?# *\<\/wordone\>
1413: /g;
1414: return $matchexp;
1415: }
1416:
1417: ######################################################################
1418: ######################################################################
1419:
1420: =pod
1421:
1422: =item &recursive_SQL_query_build()
1423:
1424: Recursively constructs an SQL query. Takes as input $dkey and $pattern.
1425:
1426: =cut
1427:
1428: ######################################################################
1429: ######################################################################
1430: sub recursive_SQL_query_build {
1431: my ($dkey,$pattern)=@_;
1432: my @matches=($pattern=~/(\[[^\]|\[]*\])/g);
1433: return $pattern unless @matches;
1434: foreach my $match (@matches) {
1435: $match=~/\[ (\w+)\s(.*) \]/;
1436: my ($key,$value)=($1,$2);
1437: my $replacement='';
1438: if ($key eq 'literal') {
1439: $replacement="($dkey like \"\%$value\%\")";
1440: }
1441: elsif ($key eq 'not') {
1442: $value=~s/like/not like/;
1443: # $replacement="($dkey not like $value)";
1444: $replacement="$value";
1445: }
1446: elsif ($key eq 'and') {
1447: $value=~/(.*[\"|\)]) ([|\(|\^].*)/;
1448: $replacement="($1 AND $2)";
1449: }
1450: elsif ($key eq 'or') {
1451: $value=~/(.*[\"|\)]) ([|\(|\^].*)/;
1452: $replacement="($1 OR $2)";
1453: }
1454: substr($pattern,
1455: index($pattern,$match),
1456: length($match),
1457: $replacement
1458: );
1459: }
1460: &recursive_SQL_query_build($dkey,$pattern);
1461: }
1462:
1463: ######################################################################
1464: ######################################################################
1465:
1466: =pod
1467:
1468: =item &build_date_queries()
1469:
1470: Builds a SQL logic query to check time/date entries.
1471: Also reports errors (check for /^Incorrect/).
1472:
1473: =cut
1474:
1475: ######################################################################
1476: ######################################################################
1477: sub build_date_queries {
1478: my ($cmonth1,$cday1,$cyear1,$cmonth2,$cday2,$cyear2,
1479: $lmonth1,$lday1,$lyear1,$lmonth2,$lday2,$lyear2)=@_;
1480: my @queries;
1481: if ($cmonth1 or $cday1 or $cyear1 or $cmonth2 or $cday2 or $cyear2) {
1482: unless ($cmonth1 and $cday1 and $cyear1 and
1483: $cmonth2 and $cday2 and $cyear2) {
1484: return "Incorrect entry for the creation date. You must specify ".
1485: "a starting month, day, and year and an ending month, ".
1486: "day, and year.";
1487: }
1488: my $cnumeric1=sprintf("%d%2d%2d",$cyear1,$cmonth1,$cday1);
1489: $cnumeric1+=0;
1490: my $cnumeric2=sprintf("%d%2d%2d",$cyear2,$cmonth2,$cday2);
1491: $cnumeric2+=0;
1492: if ($cnumeric1>$cnumeric2) {
1493: return "Incorrect entry for the creation date. The starting ".
1494: "date must occur before the ending date.";
1495: }
1496: my $cquery="(creationdate BETWEEN '$cyear1-$cmonth1-$cday1' AND '".
1497: "$cyear2-$cmonth2-$cday2 23:59:59')";
1498: push @queries,$cquery;
1499: }
1500: if ($lmonth1 or $lday1 or $lyear1 or $lmonth2 or $lday2 or $lyear2) {
1501: unless ($lmonth1 and $lday1 and $lyear1 and
1502: $lmonth2 and $lday2 and $lyear2) {
1503: return "Incorrect entry for the last revision date. You must ".
1504: "specify a starting month, day, and year and an ending ".
1505: "month, day, and year.";
1506: }
1507: my $lnumeric1=sprintf("%d%2d%2d",$lyear1,$lmonth1,$lday1);
1508: $lnumeric1+=0;
1509: my $lnumeric2=sprintf("%d%2d%2d",$lyear2,$lmonth2,$lday2);
1510: $lnumeric2+=0;
1511: if ($lnumeric1>$lnumeric2) {
1512: return "Incorrect entry for the last revision date. The ".
1513: "starting date must occur before the ending date.";
1514: }
1515: my $lquery="(lastrevisiondate BETWEEN '$lyear1-$lmonth1-$lday1' AND '".
1516: "$lyear2-$lmonth2-$lday2 23:59:59')";
1517: push @queries,$lquery;
1518: }
1519: if (@queries) {
1520: return join(" AND ",@queries);
1521: }
1522: return '';
1523: }
1524:
1525: ######################################################################
1526: ######################################################################
1527:
1528: =pod
1529:
1530: =item ©right_check()
1531:
1532: =cut
1533:
1534: ######################################################################
1535: ######################################################################
1536: sub copyright_check {
1537: my $Metadata = shift;
1538: # Check copyright tags and skip results the user cannot use
1539: my (undef,undef,$resdom,$resname) = split('/',
1540: $Metadata->{'url'});
1541: # Check for priv
1542: if (($Metadata->{'copyright'} eq 'priv') &&
1543: (($ENV{'user.name'} ne $resname) &&
1544: ($ENV{'user.domain'} ne $resdom))) {
1545: return 0;
1546: }
1547: # Check for domain
1548: if (($Metadata->{'copyright'} eq 'domain') &&
1549: ($ENV{'user.domain'} ne $resdom)) {
1550: return 0;
1551: }
1552: return 1;
1553: }
1554:
1555:
1556: ######################################################################
1557: ######################################################################
1558:
1559: =pod
1560:
1561: =item &ensure_db_and_table
1562:
1563: Ensure we can get lonmysql to connect to the database and the table we
1564: need exists.
1565:
1566: Inputs: $r, table id
1567:
1568: Returns: undef on error, 1 if the table exists.
1569:
1570: =cut
1571:
1572: ######################################################################
1573: ######################################################################
1574: sub ensure_db_and_table {
1575: my ($r,$table) = @_;
1576: ##
1577: ## Sanity check the table id.
1578: ##
1579: if (! defined($table) || $table eq '' || $table =~ /\D/ ) {
1580: $r->print("Unable to retrieve search results. ".
1581: "Unable to determine the table results were stored in. ".
1582: "</body></html>");
1583: return undef;
1584: }
1585: ##
1586: ## Make sure we can connect and the table exists.
1587: ##
1588: my $connection_result = &Apache::lonmysql::connect_to_db();
1589: if (!defined($connection_result)) {
1590: $r->print("Unable to connect to the MySQL database where your results".
1591: " are stored. </body></html>");
1592: &Apache::lonnet::logthis("lonsearchcat: unable to get lonmysql to".
1593: " connect to database.");
1594: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
1595: return undef;
1596: }
1597: my $table_check = &Apache::lonmysql::check_table($table);
1598: if (! defined($table_check)) {
1599: $r->print("A MySQL error has occurred.</form></body></html>");
1600: &Apache::lonnet::logthis("lonmysql was unable to determine the status".
1601: " of table ".$table);
1602: return undef;
1603: } elsif (! $table_check) {
1604: $r->print("The table of results could not be found.");
1605: &Apache::lonnet::logthis("The user requested a table, ".$table.
1606: ", that could not be found.");
1607: return undef;
1608: }
1609: return 1;
1610: }
1611:
1612: ######################################################################
1613: ######################################################################
1614:
1615: =pod
1616:
1617: =item &print_sort_form
1618:
1619: =cut
1620:
1621: ######################################################################
1622: ######################################################################
1623: sub print_sort_form {
1624: my ($r,$pretty_query_string) = @_;
1625: ##
1626: my %SortableFields =
1627: (id => 'Default',
1628: title => 'Title',
1629: author => 'Author',
1630: subject => 'Subject',
1631: url => 'URL',
1632: version => 'Version Number',
1633: mime => 'Mime type',
1634: lang => 'Language',
1635: owner => 'Owner/Publisher',
1636: copyright => 'Copyright',
1637: hostname => 'Host',
1638: creationdate => 'Creation Date',
1639: lastrevisiondate => 'Revision Date',
1640: );
1641: ##
1642: my $table = $ENV{'form.table'};
1643: return if (! &ensure_db_and_table($r,$table));
1644: ##
1645: ## Get the number of results
1646: ##
1647: my $total_results = &Apache::lonmysql::number_of_rows($table);
1648: if (! defined($total_results)) {
1649: $r->print("A MySQL error has occurred.</form></body></html>");
1650: &Apache::lonnet::logthis("lonmysql was unable to determine the number".
1651: " of rows in table ".$table);
1652: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
1653: return;
1654: }
1655: my $result;
1656: $result.=<<END;
1657: <html>
1658: <head>
1659: <script>
1660: function change_sort() {
1661: var newloc = "/adm/searchcat?phase=results";
1662: newloc += "&persistent_db_id=$ENV{'form.persistent_db_id'}";
1663: newloc += "&sortby=";
1664: newloc += document.forms.statusform.elements.sortby.value;
1665: parent.resultsframe.location= newloc;
1666: }
1667: </script>
1668: <title>Results</title>
1669: </head>
1670: <body>
1671: <form name="statusform" action="" method="post">
1672: <input type="hidden" name="Queue" value="" />
1673: END
1674:
1675: #<h2>Sort Results</h2>
1676: #Sort by: <select size="1" name="sortby" onchange="javascript:change_sort();">
1677: # $ENV{'form.sortby'} = 'id' if (! defined($ENV{'form.sortby'}));
1678: # foreach (keys(%SortableFields)) {
1679: # $result.="<option name=\"$_\"";
1680: # if ($_ eq $ENV{'form.sortby'}) {
1681: # $result.=" selected ";
1682: # }
1683: # $result.=" >$SortableFields{$_}</option>\n";
1684: # }
1685: # $result.="</select>\n";
1686: my $revise = &revise_button();
1687: $result.=<<END;
1688: <p>
1689: There are $total_results matches to your query. $revise
1690: </p><p>
1691: Search:$pretty_query_string
1692: </p>
1693: </form>
1694: </body>
1695: </html>
1696: END
1697: $r->print($result);
1698: return;
1699: }
1700:
1701: #####################################################################
1702: #####################################################################
1703:
1704: =pod
1705:
1706: =item MySQL Table Description
1707:
1708: MySQL table creation requires a precise description of the data to be
1709: stored. The use of the correct types to hold data is vital to efficient
1710: storage and quick retrieval of records. The columns must be described in
1711: the following format:
1712:
1713: =cut
1714:
1715: ##
1716: ## Restrictions:
1717: ## columns of type 'text' and 'blob' cannot have defaults.
1718: ## columns of type 'enum' cannot be used for FULLTEXT.
1719: ##
1720: my @DataOrder = qw/id title author subject url keywords version notes
1721: abstract mime lang owner copyright creationdate lastrevisiondate hostname/;
1722:
1723: my %Datatypes =
1724: ( id =>{ type => 'MEDIUMINT',
1725: restrictions => 'UNSIGNED NOT NULL',
1726: primary_key => 'yes',
1727: auto_inc => 'yes'
1728: },
1729: title =>{ type=>'TEXT'},
1730: author =>{ type=>'TEXT'},
1731: subject =>{ type=>'TEXT'},
1732: url =>{ type=>'TEXT',
1733: restrictions => 'NOT NULL' },
1734: keywords =>{ type=>'TEXT'},
1735: version =>{ type=>'TEXT'},
1736: notes =>{ type=>'TEXT'},
1737: abstract =>{ type=>'TEXT'},
1738: mime =>{ type=>'TEXT'},
1739: lang =>{ type=>'TEXT'},
1740: owner =>{ type=>'TEXT'},
1741: copyright =>{ type=>'TEXT'},
1742: hostname =>{ type=>'TEXT'},
1743: #--------------------------------------------------
1744: creationdate =>{ type=>'DATETIME'},
1745: lastrevisiondate =>{ type=>'DATETIME'},
1746: #--------------------------------------------------
1747: );
1748:
1749: my @Fullindicies =
1750: qw/title/;
1751: # qw/title author subject abstract mime language owner copyright/;
1752:
1753: ######################################################################
1754: ######################################################################
1755:
1756: =pod
1757:
1758: =item &create_results_table()
1759:
1760: Creates the table of search results by calling lonmysql. Stores the
1761: table id in $ENV{'form.table'}
1762:
1763: Inputs: none.
1764:
1765: Returns: the identifier of the table on success, undef on error.
1766:
1767: =cut
1768:
1769: ######################################################################
1770: ######################################################################
1771: sub create_results_table {
1772: my $table = &Apache::lonmysql::create_table
1773: ( { columns => \%Datatypes,
1774: column_order => \@DataOrder,
1775: fullindex => \@Fullindicies,
1776: } );
1777: if (defined($table)) {
1778: $ENV{'form.table'} = $table;
1779: return $table;
1780: }
1781: return undef; # Error...
1782: }
1783:
1784: ######################################################################
1785: ######################################################################
1786:
1787: =pod
1788:
1789: =item Search Status update functions
1790:
1791: Each of the following functions changes the values of one of the
1792: input fields used to display the search status to the user. The names
1793: should be explanatory.
1794:
1795: Inputs: Apache request handler ($r), text to display.
1796:
1797: Returns: Nothing.
1798:
1799: =over 4
1800:
1801: =item &update_count_status()
1802:
1803: =item &update_status()
1804:
1805: =item &update_seconds()
1806:
1807: =back
1808:
1809: =cut
1810:
1811: ######################################################################
1812: ######################################################################
1813: sub update_count_status {
1814: my ($r,$text) = @_;
1815: $text =~ s/\'/\\\'/g;
1816: $r->print
1817: ("<script>document.statusform.count.value = ' $text'</script>\n");
1818: $r->rflush();
1819: }
1820:
1821: sub update_status {
1822: my ($r,$text) = @_;
1823: $text =~ s/\'/\\\'/g;
1824: $r->print
1825: ("<script>document.statusform.status.value = ' $text'</script>\n");
1826: $r->rflush();
1827: }
1828:
1829: sub update_seconds {
1830: my ($r,$text) = @_;
1831: $text =~ s/\'/\\\'/g;
1832: $r->print
1833: ("<script>document.statusform.seconds.value = ' $text'</script>\n");
1834: $r->rflush();
1835: }
1836:
1837: ######################################################################
1838: ######################################################################
1839:
1840: =pod
1841:
1842: =item &revise_button
1843:
1844: Inputs: None
1845:
1846: Returns: html string for a 'revise search' button.
1847:
1848: =cut
1849:
1850: ######################################################################
1851: ######################################################################
1852: sub revise_button {
1853: my $revise_phase = 'disp_basic';
1854: $revise_phase = 'disp_adv' if ($ENV{'form.searchmode'} eq 'advanced');
1855: my $newloc = '/adm/searchcat'.
1856: '?persistent_db_id='.$ENV{'form.persistent_db_id'}.
1857: '&phase='.$revise_phase;
1858: my $result = qq{<input type="button" value="Revise search" name="revise"} .
1859: qq{ onClick="parent.location='$newloc';" /> };
1860: return $result;
1861: }
1862:
1863: ######################################################################
1864: ######################################################################
1865:
1866: =pod
1867:
1868: =item &run_search
1869:
1870: =cut
1871:
1872: ######################################################################
1873: ######################################################################
1874: sub run_search {
1875: my ($r,$query,$customquery,$customshow,$serverlist,$pretty_string) = @_;
1876: my $connection = $r->connection;
1877: #
1878: # Timing variables
1879: #
1880: my $starttime = time;
1881: my $max_time = 30; # seconds for the search to complete
1882: #
1883: # Print run_search header
1884: #
1885: $r->print(<<END);
1886: <html>
1887: <head><title>Search Status</title></head>
1888: <body>
1889: <form name="statusform" action="" method="post">
1890: <input type="hidden" name="Queue" value="" />
1891: END
1892: # Check to see if $pretty_string has more than one carriage return.
1893: # Assume \n s are following <br /> s and truncate the value.
1894: # (there is probably a better way)...
1895: my @Lines = split /<br \/>/,$pretty_string;
1896: if (@Lines > 2) {
1897: $pretty_string = join '<br \>',(@Lines[0..2],'....<br />');
1898: }
1899: $r->print("Search: ".$pretty_string);
1900: $r->rflush();
1901: #
1902: # Determine the servers we need to contact.
1903: #
1904: my @Servers_to_contact;
1905: if (defined($serverlist)) {
1906: if (ref($serverlist) eq 'ARRAY') {
1907: @Servers_to_contact = @$serverlist;
1908: } else {
1909: @Servers_to_contact = ($serverlist);
1910: }
1911: } else {
1912: @Servers_to_contact = sort(keys(%Apache::lonnet::libserv));
1913: }
1914: my %Server_status;
1915: my $table =$ENV{'form.table'};
1916: if (! defined($table) || $table eq '' || $table =~ /\D/ ) {
1917: $r->print("Unable to determine table id to store search results in.".
1918: "The search has been aborted.</body></html>");
1919: return;
1920: }
1921: my $table_status = &Apache::lonmysql::check_table($table);
1922: if (! defined($table_status)) {
1923: $r->print("Unable to determine status of table.</body></html>");
1924: &Apache::lonnet::logthis("Bogus table id of $table for ".
1925: "$ENV{'user.name'} @ $ENV{'user.domain'}");
1926: &Apache::lonnet::logthis("lonmysql error = ".
1927: &Apache::lonmysql::get_error());
1928: return;
1929: }
1930: if (! $table_status) {
1931: $r->print("The table id,$table, we tried to use is invalid.".
1932: "The search has been aborted.</body></html>");
1933: return;
1934: }
1935: ##
1936: ## Prepare for the big loop.
1937: ##
1938: my $hitcountsum;
1939: my $server;
1940: my $status;
1941: my $revise = &revise_button();
1942: $r->print(<<END);
1943: <table>
1944: <tr><th>Status</th><th>Total Matches</th><th>Time Remaining</th><th></th></tr>
1945: <tr>
1946: <td><input type="text" name="status" value="" size="30" /></td>
1947: <td><input type="text" name="count" value="" size="10" /></td>
1948: <td><input type="text" name="seconds" value="" size="8" /></td>
1949: <td>$revise</td>
1950: </tr>
1951: </table>
1952: </form>
1953: END
1954: $r->rflush();
1955: my $time_remaining = $max_time - (time - $starttime) ;
1956: my $last_time = $time_remaining;
1957: &update_seconds($r,$time_remaining);
1958: while (($time_remaining > 0) &&
1959: ((@Servers_to_contact) || keys(%Server_status))) {
1960: # Send out a search request if it needs to be done.
1961: if (@Servers_to_contact) {
1962: # Contact one server
1963: my $server = shift(@Servers_to_contact);
1964: my $reply=&Apache::lonnet::metadata_query($query,$customquery,
1965: $customshow,[$server]);
1966: ($server) = keys(%$reply);
1967: $Server_status{$server} = $reply->{$server};
1968: &update_status($r,'contacting '.$server);
1969: } else {
1970: # wait a sec. to give time for files to be written
1971: # This sleep statement is here instead of outside the else
1972: # block because we do not want to pause if we have servers
1973: # left to contact.
1974: sleep(1);
1975: }
1976: &update_status($r,'waiting on '.(join(' ',keys(%Server_status))));
1977: while (my ($server,$status) = each(%Server_status)) {
1978: last if ($connection->aborted());
1979: if ($status eq 'con_lost') {
1980: delete ($Server_status{$server});
1981: next;
1982: }
1983: $status=~/^([\.\w]+)$/;
1984: my $datafile=$r->dir_config('lonDaemons').'/tmp/'.$1;
1985: if (-e $datafile && ! -e "$datafile.end") {
1986: &update_status($r,'Receiving results from '.$server);
1987: next;
1988: }
1989: last if ($connection->aborted());
1990: if (-e "$datafile.end") {
1991: &update_status($r,'Reading results from '.$server);
1992: if (-z "$datafile") {
1993: delete($Server_status{$server});
1994: next;
1995: }
1996: my $fh;
1997: if (!($fh=Apache::File->new($datafile))) {
1998: $r->print("Unable to open search results file for ".
1999: "server $server. Omitting from search");
2000: delete($Server_status{$server});
2001: next;
2002: }
2003: # Read in the whole file.
2004: while (my $result = <$fh>) {
2005: last if ($connection->aborted());
2006: # handle custom fields? Someday we will!
2007: chomp($result);
2008: next unless $result;
2009: # Parse the result.
2010: my %Fields = &parse_raw_result($result,$server);
2011: $Fields{'hostname'} = $server;
2012: next if (! ©right_check(\%Fields));
2013: # Store the result in the mysql database
2014: my $result = &Apache::lonmysql::store_row($table,\%Fields);
2015: if (! defined($result)) {
2016: $r->print(&Apache::lonmysql::get_error());
2017: }
2018: # $r->print(&Apache::lonmysql::get_debug());
2019: $hitcountsum ++;
2020: $time_remaining = $max_time - (time - $starttime) ;
2021: if ($last_time - $time_remaining > 0) {
2022: &update_seconds($r,$time_remaining);
2023: $last_time = $time_remaining;
2024: }
2025: if ($hitcountsum % 50 == 0) {
2026: &update_count_status($r,$hitcountsum);
2027: }
2028: } # End of foreach (@results)
2029: $fh->close();
2030: # $server is only deleted if the results file has been
2031: # found and (successfully) opened. This may be a bad idea.
2032: delete($Server_status{$server});
2033: }
2034: last if ($connection->aborted());
2035: &update_count_status($r,$hitcountsum);
2036: }
2037: last if ($connection->aborted());
2038: # Finished looping through the servers
2039: $time_remaining = $max_time - (time - $starttime) ;
2040: if ($last_time - $time_remaining > 0) {
2041: $last_time = $time_remaining;
2042: &update_seconds($r,$time_remaining);
2043: }
2044: }
2045: &update_status($r,'Search Complete'.$server);
2046: &update_seconds($r,0);
2047: &Apache::lonmysql::disconnect_from_db();
2048: # We have run out of time or run out of servers to talk to and
2049: # results to get.
2050: $r->print("</body></html>");
2051: if ($ENV{'form.catalogmode'} ne 'groupsearch') {
2052: $r->print("<script>".
2053: "window.location='/adm/searchcat?".
2054: "phase=sort&".
2055: "persistent_db_id=$ENV{'form.persistent_db_id'}';".
2056: "</script>");
2057: }
2058: return;
2059: }
2060:
2061: ######################################################################
2062: ######################################################################
2063: =pod
2064:
2065: =item &prev_next_buttons
2066:
2067: =cut
2068:
2069: ######################################################################
2070: ######################################################################
2071: sub prev_next_buttons {
2072: my ($current_min,$show,$total,$parms) = @_;
2073: return '' if ($show eq 'all'); # No links if you get them all at once.
2074: my $links;
2075: ##
2076: ## Prev
2077: my $prev_min = $current_min - $show;
2078: $prev_min = 1 if $prev_min < 1;
2079: if ($prev_min < $current_min) {
2080: $links .= qq{
2081: <a href="/adm/searchcat?$parms&start=$prev_min&show=$show">prev</a>
2082: };
2083: } else {
2084: $links .= 'prev';
2085: }
2086: ##
2087: ## Pages.... Someday.
2088: ##
2089: $links .= qq{
2090: <a href="/adm/searchcat?$parms&start=$current_min&$show=$show">reload</a>
2091: };
2092: ##
2093: ## Next
2094: my $next_min = $current_min + $show;
2095: $next_min = $current_min if ($next_min > $total);
2096: if ($next_min != $current_min) {
2097: $links .= qq{
2098: <a href="/adm/searchcat?$parms&start=$next_min&show=$show">next</a>
2099: };
2100: } else {
2101: $links .= ' next';
2102: }
2103: return $links;
2104: }
2105: ######################################################################
2106: ######################################################################
2107:
2108: =pod
2109:
2110: =item &display_results
2111:
2112: =cut
2113:
2114: ######################################################################
2115: ######################################################################
2116: sub display_results {
2117: my ($r,$importbutton,$closebutton) = @_;
2118: my $connection = $r->connection;
2119: $r->print(&search_results_header($importbutton,$closebutton));
2120: ##
2121: ## Set viewing function
2122: ##
2123: my $viewfunction = $Views{$ENV{'form.viewselect'}};
2124: if (!defined($viewfunction)) {
2125: $r->print("Internal Error - Bad view selected.\n");
2126: $r->rflush();
2127: return;
2128: }
2129: ##
2130: ## Get the catalog controls setup
2131: ##
2132: my $action = "/adm/searchcat?phase=results";
2133: ##
2134: ## Deal with groupsearch
2135: ##
2136: if ($ENV{'form.catalogmode'} eq 'groupsearch') {
2137: if (! tie(%groupsearch_db,'GDBM_File',$diropendb,
2138: &GDBM_WRCREAT(),0640)) {
2139: $r->print('Unable to store import results.</form></body></html>');
2140: $r->rflush();
2141: return;
2142: }
2143: }
2144: ##
2145: ## Prepare the table for querying
2146: ##
2147: my $table = $ENV{'form.table'};
2148: return if (! &ensure_db_and_table($r,$table));
2149: ##
2150: ## Get the number of results
2151: ##
2152: my $total_results = &Apache::lonmysql::number_of_rows($table);
2153: if (! defined($total_results)) {
2154: $r->print("A MySQL error has occurred.</form></body></html>");
2155: &Apache::lonnet::logthis("lonmysql was unable to determine the number".
2156: " of rows in table ".$table);
2157: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
2158: return;
2159: }
2160: ##
2161: ## Determine how many results we need to get
2162: ##
2163: $ENV{'form.start'} = 1 if (! exists($ENV{'form.start'}));
2164: $ENV{'form.show'} = 'all' if (! exists($ENV{'form.show'}));
2165: my $min = $ENV{'form.start'};
2166: my $max;
2167: if ($ENV{'form.show'} eq 'all') {
2168: $max = $total_results ;
2169: } else {
2170: $max = $min + $ENV{'form.show'} - 1;
2171: $max = $total_results if ($max > $total_results);
2172: }
2173: ##
2174: ## Output links (if necessary) for 'prev' and 'next' pages.
2175: ##
2176: $r->print
2177: ('<center>'.
2178: &prev_next_buttons($min,$ENV{'form.show'},$total_results,
2179: "table=".$ENV{'form.table'}.
2180: "&phase=results".
2181: "&persistent_db_id=".$ENV{'form.persistent_db_id'})
2182: ."</center>\n"
2183: );
2184: if ($total_results == 0) {
2185: $r->print("There are currently no results.\n".
2186: "</form></body></html>");
2187: return;
2188: } else {
2189: $r->print
2190: ("<center>Results $min to $max out of $total_results</center>\n");
2191: }
2192: ##
2193: ## Get results from MySQL table
2194: ##
2195: my @Results = &Apache::lonmysql::get_rows($table,
2196: 'id>='.$min.' AND id<='.$max);
2197: ##
2198: ## Loop through the results and output them.
2199: ##
2200: foreach my $row (@Results) {
2201: if ($connection->aborted()) {
2202: untie %groupsearch_db if (tied(%groupsearch_db));
2203: &Apache::lonmysql::disconnect_from_db();
2204: return;
2205: }
2206: my %Fields = %{&parse_row(@$row)};
2207: my $output="<p>\n";
2208: my $prefix=&catalogmode_output($Fields{'title'},$Fields{'url'});
2209: # Render the result into html
2210: $output.= &$viewfunction($prefix,%Fields);
2211: # Print them out as they come in.
2212: $r->print($output);
2213: $r->rflush();
2214: }
2215: if (@Results < 1) {
2216: $r->print("There were no results matching your query");
2217: } else {
2218: $r->print
2219: ('<center>'.
2220: &prev_next_buttons($min,$ENV{'form.show'},$total_results,
2221: "table=".$ENV{'form.table'}.
2222: "&phase=results".
2223: "&persistent_db_id=".
2224: $ENV{'form.persistent_db_id'})
2225: ."</center>\n"
2226: );
2227: }
2228: $r->print("</form></body></html>");
2229: $r->rflush();
2230: untie %groupsearch_db if (tied(%groupsearch_db));
2231: return;
2232: }
2233:
2234: ######################################################################
2235: ######################################################################
2236:
2237: =pod
2238:
2239: =item &catalogmode_output($title,$url)
2240:
2241: Returns html needed for the various catalog modes. Gets inputs from
2242: $ENV{'form.catalogmode'}. Stores data in %groupsearch_db and $fnum
2243: (local variable).
2244:
2245: =cut
2246:
2247: ######################################################################
2248: ######################################################################
2249: {
2250: my $fnum = 0;
2251:
2252: sub catalogmode_output {
2253: my $output = '';
2254: my ($title,$url) = @_;
2255: if ($ENV{'form.catalogmode'} eq 'interactive') {
2256: $title=~ s/\'/\\\'/g;
2257: if ($ENV{'form.catalogmode'} eq 'interactive') {
2258: $output.=<<END
2259: <font size='-1'><INPUT TYPE="button" NAME="returnvalues" VALUE="SELECT"
2260: onClick="javascript:select_data('$title','$url')">
2261: </font>
2262: END
2263: }
2264: } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') {
2265: $groupsearch_db{"pre_${fnum}_link"}=$url;
2266: $groupsearch_db{"pre_${fnum}_title"}=$title;
2267: $output.=<<END;
2268: <font size='-1'>
2269: <input type="checkbox" name="returnvalues" value="SELECT"
2270: onClick="javascript:queue($fnum)" />
2271: </font>
2272: END
2273: $fnum++;
2274: }
2275: return $output;
2276: }
2277:
2278: }
2279: ######################################################################
2280: ######################################################################
2281:
2282: =pod
2283:
2284: =item &parse_row
2285:
2286: Parse a row returned from the database.
2287:
2288: =cut
2289:
2290: ######################################################################
2291: ######################################################################
2292: sub parse_row {
2293: my @Row = @_;
2294: my %Fields;
2295: for (my $i=0;$i<=$#Row;$i++) {
2296: $Fields{$DataOrder[$i]}=&Apache::lonnet::unescape($Row[$i]);
2297: }
2298: $Fields{'language'} =
2299: &Apache::loncommon::languagedescription($Fields{'lang'});
2300: $Fields{'copyrighttag'} =
2301: &Apache::loncommon::copyrightdescription($Fields{'copyright'});
2302: $Fields{'mimetag'} =
2303: &Apache::loncommon::filedescription($Fields{'mime'});
2304: return \%Fields;
2305: }
2306:
2307: ###########################################################
2308: ###########################################################
2309:
2310: =pod
2311:
2312: =item &parse_raw_result()
2313:
2314: Takes a line from the file of results and parse it. Returns a hash
2315: with keys for the following fields:
2316: 'title', 'author', 'subject', 'url', 'keywords', 'version', 'notes',
2317: 'abstract', 'mime', 'lang', 'owner', 'copyright', 'creationdate',
2318: 'lastrevisiondate'.
2319:
2320: In addition, the following tags are set by calling the appropriate
2321: lonnet function: 'language', 'cprtag', 'mimetag'.
2322:
2323: The 'title' field is set to "Untitled" if the title field is blank.
2324:
2325: 'abstract' and 'keywords' are truncated to 200 characters.
2326:
2327: =cut
2328:
2329: ###########################################################
2330: ###########################################################
2331: sub parse_raw_result {
2332: my ($result,$hostname) = @_;
2333: # Check for a comma - if it is there then we do not need to unescape the
2334: # string. There seems to be some kind of problem with some items in
2335: # the database - the entire string gets sent out unescaped...?
2336: unless ($result =~ /,/) {
2337: $result = &Apache::lonnet::unescape($result);
2338: }
2339: my @fields=map {
2340: &Apache::lonnet::unescape($_);
2341: } (split(/\,/,$result));
2342: my ($title,$author,$subject,$url,$keywords,$version,
2343: $notes,$abstract,$mime,$lang,
2344: $creationdate,$lastrevisiondate,$owner,$copyright)=@fields;
2345: my %Fields =
2346: ( title => &Apache::lonnet::unescape($title),
2347: author => &Apache::lonnet::unescape($author),
2348: subject => &Apache::lonnet::unescape($subject),
2349: url => &Apache::lonnet::unescape($url),
2350: keywords => &Apache::lonnet::unescape($keywords),
2351: version => &Apache::lonnet::unescape($version),
2352: notes => &Apache::lonnet::unescape($notes),
2353: abstract => &Apache::lonnet::unescape($abstract),
2354: mime => &Apache::lonnet::unescape($mime),
2355: lang => &Apache::lonnet::unescape($lang),
2356: owner => &Apache::lonnet::unescape($owner),
2357: copyright => &Apache::lonnet::unescape($copyright),
2358: creationdate => &Apache::lonnet::unescape($creationdate),
2359: lastrevisiondate => &Apache::lonnet::unescape($lastrevisiondate)
2360: );
2361: $Fields{'language'} =
2362: &Apache::loncommon::languagedescription($Fields{'lang'});
2363: $Fields{'copyrighttag'} =
2364: &Apache::loncommon::copyrightdescription($Fields{'copyright'});
2365: $Fields{'mimetag'} =
2366: &Apache::loncommon::filedescription($Fields{'mime'});
2367: if ($Fields{'author'}=~/^(\s*|error)$/) {
2368: $Fields{'author'}="Unknown Author";
2369: }
2370: # Put spaces in the keyword list, if needed.
2371: $Fields{'keywords'}=~ s/,([A-z])/, $1/g;
2372: if ($Fields{'title'}=~ /^\s*$/ ) {
2373: $Fields{'title'}='Untitled';
2374: }
2375: unless ($ENV{'user.adv'}) {
2376: # What is this anyway?
2377: $Fields{'keywords'} = '- not displayed -';
2378: $Fields{'notes'} = '- not displayed -';
2379: $Fields{'abstract'} = '- not displayed -';
2380: $Fields{'subject'} = '- not displayed -';
2381: }
2382: if (length($Fields{'abstract'})>200) {
2383: $Fields{'abstract'} =
2384: substr($Fields{'abstract'},0,200).'...';
2385: }
2386: if (length($Fields{'keywords'})>200) {
2387: $Fields{'keywords'} =
2388: substr($Fields{'keywords'},0,200).'...';
2389: }
2390: return %Fields;
2391: }
2392:
2393: ###########################################################
2394: ###########################################################
2395:
2396: =pod
2397:
2398: =item &handle_custom_fields()
2399:
2400: =cut
2401:
2402: ###########################################################
2403: ###########################################################
2404: sub handle_custom_fields {
2405: my @results = @{shift()};
2406: my $customshow='';
2407: my $extrashow='';
2408: my @customfields;
2409: if ($ENV{'form.customshow'}) {
2410: $customshow=$ENV{'form.customshow'};
2411: $customshow=~s/[^\w\s]//g;
2412: my @fields=map {
2413: "<font color=\"#008000\">$_:</font><!-- $_ -->";
2414: } split(/\s+/,$customshow);
2415: @customfields=split(/\s+/,$customshow);
2416: if ($customshow) {
2417: $extrashow="<ul><li>".join("</li><li>",@fields)."</li></ul>\n";
2418: }
2419: }
2420: my $customdata='';
2421: my %customhash;
2422: foreach my $result (@results) {
2423: if ($result=~/^(custom\=.*)$/) { # grab all custom metadata
2424: my $tmp=$result;
2425: $tmp=~s/^custom\=//;
2426: my ($k,$v)=map {&Apache::lonnet::unescape($_);
2427: } split(/\,/,$tmp);
2428: $customhash{$k}=$v;
2429: }
2430: }
2431: return ($extrashow,\@customfields,\%customhash);
2432: }
2433:
2434: ######################################################################
2435: ######################################################################
2436:
2437: =pod
2438:
2439: =item &search_results_header
2440:
2441: Output the proper html headers and javascript code to deal with different
2442: calling modes.
2443:
2444: Takes most inputs directly from %ENV, except $mode.
2445:
2446: =over 4
2447:
2448: =item $mode is either (at this writing) 'Basic' or 'Advanced'
2449:
2450: =back
2451:
2452: The following environment variables are checked:
2453:
2454: =over 4
2455:
2456: =item 'form.catalogmode'
2457:
2458: Checked for 'interactive' and 'groupsearch'.
2459:
2460: =item 'form.mode'
2461:
2462: Checked for existance & 'edit' mode.
2463:
2464: =item 'form.form'
2465:
2466: =item 'form.element'
2467:
2468: =back
2469:
2470: =cut
2471:
2472: ######################################################################
2473: ######################################################################
2474: sub search_results_header {
2475: my ($importbutton,$closebutton) = @_;
2476: my $result = '';
2477: # output beginning of search page
2478: # conditional output of script functions dependent on the mode in
2479: # which the search was invoked
2480: if ($ENV{'form.catalogmode'} eq 'interactive'){
2481: if (! exists($ENV{'form.mode'}) || $ENV{'form.mode'} ne 'edit') {
2482: $result.=<<SCRIPT;
2483: <script type="text/javascript">
2484: function select_data(title,url) {
2485: changeTitle(title);
2486: changeURL(url);
2487: parent.close();
2488: }
2489: function changeTitle(val) {
2490: if (parent.opener.inf.document.forms.resinfo.elements.t) {
2491: parent.opener.inf.document.forms.resinfo.elements.t.value=val;
2492: }
2493: }
2494: function changeURL(val) {
2495: if (parent.opener.inf.document.forms.resinfo.elements.u) {
2496: parent.opener.inf.document.forms.resinfo.elements.u.value=val;
2497: }
2498: }
2499: </script>
2500: SCRIPT
2501: } elsif ($ENV{'form.mode'} eq 'edit') {
2502: my $form = $ENV{'form.form'};
2503: my $element = $ENV{'form.element'};
2504: $result.=<<SCRIPT;
2505: <script type="text/javascript">
2506: function select_data(title,url) {
2507: changeURL(url);
2508: parent.close();
2509: }
2510: function changeTitle(val) {
2511: }
2512: function changeURL(val) {
2513: if (parent.targetwin.document) {
2514: parent.targetwin.document.forms["$form"].elements["$element"].value=val;
2515: } else {
2516: var url = 'forms[\"$form\"].elements[\"$element\"].value';
2517: alert("Unable to transfer data to "+url);
2518: }
2519: }
2520: </script>
2521: SCRIPT
2522: }
2523: }
2524: $result.=<<SCRIPT if $ENV{'form.catalogmode'} eq 'groupsearch';
2525: <script type="text/javascript">
2526: function queue(val) {
2527: if (document.forms.results.returnvalues[val].checked) {
2528: parent.statusframe.document.forms.statusform.elements.Queue.value +='1a'+val+'b';
2529: } else {
2530: parent.statusframe.document.forms.statusform.elements.Queue.value +='0a'+val+'b';
2531: }
2532: }
2533: function select_group() {
2534: parent.window.location=
2535: "/adm/groupsort?mode=$ENV{'form.mode'}&catalogmode=groupsearch&acts="+
2536: parent.statusframe.document.forms.statusform.elements.Queue.value;
2537: }
2538: </script>
2539: SCRIPT
2540: $result.=<<END;
2541: </head>
2542: <form name="results" method="post" action="" >
2543: <input type="hidden" name="Queue" value="" />
2544: $importbutton
2545: END
2546: return $result;
2547: }
2548:
2549: ######################################################################
2550: ######################################################################
2551: sub search_status_header {
2552: return <<ENDSTATUS;
2553: <html><head><title>Search Status</title></head>
2554: <body>
2555: <h3>Search Status</h3>
2556: Sending search request to LON-CAPA servers.<br />
2557: ENDSTATUS
2558: }
2559:
2560: sub results_link {
2561: my $basic_link = "/adm/searchcat?"."&table=".$ENV{'form.table'}.
2562: "&persistent_db_id=".$ENV{'form.persistent_db_id'};
2563: my $results_link = $basic_link."&phase=results".
2564: "&pause=1"."&start=1";
2565: return $results_link;
2566: }
2567:
2568: ######################################################################
2569: ######################################################################
2570: sub print_frames_interface {
2571: my $r = shift;
2572: my $basic_link = "/adm/searchcat?"."&table=".$ENV{'form.table'}.
2573: "&persistent_db_id=".$ENV{'form.persistent_db_id'};
2574: my $run_search_link = $basic_link."&phase=run_search";
2575: my $results_link = &results_link();
2576: my $result = <<"ENDFRAMES";
2577: <html>
2578: <head>
2579: <script>
2580: var targetwin = opener;
2581: </script>
2582: <title>LON-CAPA Digital Library Search Results</title>
2583: </head>
2584: <frameset rows="150,*">
2585: <frame name="statusframe" src="$run_search_link">
2586: <frame name="resultsframe" src="$results_link">
2587: </frameset>
2588: </html>
2589: ENDFRAMES
2590:
2591: $r->print($result);
2592: return;
2593: }
2594:
2595: ######################################################################
2596: ######################################################################
2597:
2598: =pod
2599:
2600: =item Metadata Viewing Functions
2601:
2602: Output is a HTML-ified string.
2603: Input arguments are title, author, subject, url, keywords, version,
2604: notes, short abstract, mime, language, creation date,
2605: last revision date, owner, copyright, hostname, and
2606: extra custom metadata to show.
2607:
2608: =over 4
2609:
2610: =item &detailed_citation_view()
2611:
2612: =cut
2613:
2614: ######################################################################
2615: ######################################################################
2616: sub detailed_citation_view {
2617: my ($prefix,%values) = @_;
2618: my $result=<<END;
2619: <b>$prefix<a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2620: target='search_preview'>$values{'title'}</a></b>
2621: <p>
2622: <b>$values{'author'}</b>, <i>$values{'owner'}</i><br />
2623:
2624: <b>Subject: </b> $values{'subject'}<br />
2625: <b>Keyword(s): </b> $values{'keywords'}<br />
2626: <b>Notes: </b> $values{'notes'}<br />
2627: <b>MIME Type: </b> $values{'mimetag'}<br />
2628: <b>Language: </b> $values{'language'}<br />
2629: <b>Copyright/Distribution:</b> $values{'cprtag'}<br />
2630: </p>
2631: $values{'extrashow'}
2632: <p>
2633: $values{'shortabstract'}
2634: </p>
2635: <hr align='left' width='200' noshade />
2636: END
2637: return $result;
2638: }
2639:
2640: ######################################################################
2641: ######################################################################
2642:
2643: =pod
2644:
2645: =item &summary_view()
2646:
2647: =cut
2648: ######################################################################
2649: ######################################################################
2650: sub summary_view {
2651: my ($prefix,%values) = @_;
2652: my $result=<<END;
2653: $prefix<a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2654: target='search_preview'>$values{'author'}</a><br />
2655: $values{'title'}<br />
2656: $values{'owner'} -- $values{'lastrevisiondate'}<br />
2657: $values{'copyrighttag'}<br />
2658: $values{'extrashow'}
2659: </p>
2660: <hr align='left' width='200' noshade />
2661: END
2662: return $result;
2663: }
2664:
2665: ######################################################################
2666: ######################################################################
2667:
2668: =pod
2669:
2670: =item &compact_view()
2671:
2672: =cut
2673:
2674: ######################################################################
2675: ######################################################################
2676: sub compact_view {
2677: my ($prefix,%values) = @_;
2678: my $result=<<END;
2679: $prefix <a href="http://$ENV{'HTTP_HOST'}$values{'url'}" target='search_preview'>
2680: $values{'title'}</a>
2681: <b>$values{'author'}</b><br />
2682: END
2683: return $result;
2684: }
2685:
2686:
2687: ######################################################################
2688: ######################################################################
2689:
2690: =pod
2691:
2692: =item &fielded_format_view()
2693:
2694: =cut
2695:
2696: ######################################################################
2697: ######################################################################
2698: sub fielded_format_view {
2699: my ($prefix,%values) = @_;
2700: my $result=<<END;
2701: $prefix
2702: <b>URL: </b> <a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2703: target='search_preview'>$values{'url'}</a>
2704: <br />
2705: <b>Title:</b> $values{'title'}<br />
2706: <b>Author(s):</b> $values{'author'}<br />
2707: <b>Subject:</b> $values{'subject'}<br />
2708: <b>Keyword(s):</b> $values{'keywords'}<br />
2709: <b>Notes:</b> $values{'notes'}<br />
2710: <b>MIME Type:</b> $values{'mimetag'}<br />
2711: <b>Language:</b> $values{'language'}<br />
2712: <b>Creation Date:</b> $values{'creationdate'}<br />
2713: <b>Last Revision Date:</b> $values{'lastrevisiondate'}<br />
2714: <b>Publisher/Owner:</b> $values{'owner'}<br />
2715: <b>Copyright/Distribution:</b> $values{'copyrighttag'}<br />
2716: <b>Repository Location:</b> $values{'hostname'}<br />
2717: <b>Abstract:</b> $values{'shortabstract'}<br />
2718: $values{'extrashow'}
2719: </p>
2720: <hr align='left' width='200' noshade />
2721: END
2722: return $result;
2723: }
2724:
2725: ######################################################################
2726: ######################################################################
2727:
2728: =pod
2729:
2730: =item &xml_sgml_view()
2731:
2732: =back
2733:
2734: =cut
2735:
2736: ######################################################################
2737: ######################################################################
2738: sub xml_sgml_view {
2739: my ($prefix,%values) = @_;
2740: my $result=<<END;
2741: $prefix
2742: <pre>
2743: <LonCapaResource>
2744: <url>$values{'url'}</url>
2745: <title>$values{'title'}</title>
2746: <author>$values{'author'}</author>
2747: <subject>$values{'subject'}</subject>
2748: <keywords>$values{'keywords'}</keywords>
2749: <notes>$values{'notes'}</notes>
2750: <mimeInfo>
2751: <mime>$values{'mime'}</mime>
2752: <mimetag>$values{'mimetag'}</mimetag>
2753: </mimeInfo>
2754: <languageInfo>
2755: <language>$values{'lang'}</language>
2756: <languagetag>$values{'language'}</languagetag>
2757: </languageInfo>
2758: <creationdate>$values{'creationdate'}</creationdate>
2759: <lastrevisiondate>$values{'lastrevisiondate'}</lastrevisiondate>
2760: <owner>$values{'owner'}</owner>
2761: <copyrightInfo>
2762: <copyright>$values{'copyright'}</copyright>
2763: <copyrighttag>$values{'copyrighttag'}</copyrighttag>
2764: </copyrightInfo>
2765: <repositoryLocation>$values{'hostname'}</repositoryLocation>
2766: <shortabstract>$values{'shortabstract'}</shortabstract>
2767: </LonCapaResource>
2768: </pre>
2769: $values{'extrashow'}
2770: <hr align='left' width='200' noshade />
2771: END
2772: return $result;
2773: }
2774:
2775: ######################################################################
2776: ######################################################################
2777:
2778: =pod
2779:
2780: =item &filled() see if field is filled.
2781:
2782: =cut
2783:
2784: ######################################################################
2785: ######################################################################
2786: sub filled {
2787: my ($field)=@_;
2788: if ($field=~/\S/ && $field ne 'any') {
2789: return 1;
2790: }
2791: else {
2792: return 0;
2793: }
2794: }
2795:
2796: ######################################################################
2797: ######################################################################
2798:
2799: =pod
2800:
2801: =item &output_blank_field_error()
2802:
2803: Output a complete page that indicates the user has not filled in enough
2804: information to do a search.
2805:
2806: Inputs: $r (Apache request handle), $closebutton, $parms.
2807:
2808: Returns: nothing
2809:
2810: $parms is extra information to include in the 'Revise search request' link.
2811:
2812: =cut
2813:
2814: ######################################################################
2815: ######################################################################
2816: sub output_blank_field_error {
2817: my ($r,$closebutton,$parms)=@_;
2818: # make query information persistent to allow for subsequent revision
2819: $r->print(<<BEGINNING);
2820: <html>
2821: <head>
2822: <title>The LearningOnline Network with CAPA</title>
2823: BEGINNING
2824: $r->print(<<RESULTS);
2825: </head>
2826: <body bgcolor="#ffffff">
2827: <img align='right' src='/adm/lonIcons/lonlogos.gif' />
2828: <h1>Search Catalog</h1>
2829: <form method="post" action="/adm/searchcat">
2830: $hidden_fields
2831: <a href="/adm/searchcat?$parms&persistent_db_id=$ENV{'form.persistent_db_id'}"
2832: >Revise search request</a>
2833: $closebutton
2834: <hr />
2835: <h3>Unactionable search query.</h3>
2836: <p>
2837: You did not fill in enough information for the search to be started.
2838: You need to fill in relevant fields on the search page in order
2839: for a query to be processed.
2840: </p>
2841: </body>
2842: </html>
2843: RESULTS
2844: }
2845:
2846: ######################################################################
2847: ######################################################################
2848:
2849: =pod
2850:
2851: =item &output_date_error()
2852:
2853: Output a full html page with an error message.
2854:
2855: Inputs:
2856:
2857: $r, the request pointer.
2858: $message, the error message for the user.
2859: $closebutton, the specialized close button needed for groupsearch.
2860:
2861: =cut
2862:
2863: ######################################################################
2864: ######################################################################
2865: sub output_date_error {
2866: my ($r,$message,$closebutton)=@_;
2867: # make query information persistent to allow for subsequent revision
2868: $r->print(<<RESULTS);
2869: <html>
2870: <head>
2871: <title>The LearningOnline Network with CAPA</title>
2872: </head>
2873: <body bgcolor="#ffffff">
2874: <img align='right' src='/adm/lonIcons/lonlogos.gif' />
2875: <h1>Search Catalog</h1>
2876: <form method="post" action="/adm/searchcat">
2877: $hidden_fields
2878: <input type='button' value='Revise search request'
2879: onClick='this.form.submit();' />
2880: $closebutton
2881: <hr />
2882: <h3>Error</h3>
2883: <p>
2884: $message
2885: </p>
2886: </body>
2887: </html>
2888: RESULTS
2889: }
2890:
2891: ######################################################################
2892: ######################################################################
2893:
2894: =pod
2895:
2896: =item &start_fresh_session()
2897:
2898: Cleans the global %groupsearch_db by removing all fields which begin with
2899: 'pre_' or 'store'.
2900:
2901: =cut
2902:
2903: ######################################################################
2904: ######################################################################
2905: sub start_fresh_session {
2906: delete $groupsearch_db{'mode_catalog'};
2907: foreach (keys %groupsearch_db) {
2908: if ($_ =~ /^pre_/) {
2909: delete $groupsearch_db{$_};
2910: }
2911: if ($_ =~ /^store/) {
2912: delete $groupsearch_db{$_};
2913: }
2914: }
2915: }
2916:
2917: 1;
2918:
2919: __END__
2920:
2921: =pod
2922:
2923: =back
2924:
2925: =cut
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