1: # The LearningOnline Network with CAPA
2: # Search Catalog
3: #
4: # $Id: lonsearchcat.pm,v 1.163 2003/01/14 18:47:50 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: =item $bodytag
119:
120: LON-CAPA standard body tag, gotten from &Apache::lonnet::bodytag.
121: No title, no table, just a <body> tag.
122:
123: =back
124:
125: =cut
126:
127: ######################################################################
128: ######################################################################
129:
130: # -- dynamically rendered interface components
131: my $importbutton; # button to take the selected results and go to group sorting
132:
133: # -- miscellaneous variables
134: my %groupsearch_db; # database hash
135: my $diropendb = ""; # db file
136: # View Description Function Pointer
137: my %Views = ("Detailed Citation View" => \&detailed_citation_view,
138: "Summary View" => \&summary_view,
139: "Fielded Format" => \&fielded_format_view,
140: "XML/SGML" => \&xml_sgml_view,
141: "Compact View" => \&compact_view);
142: my %persistent_db;
143: my $hidden_fields;
144: my $bodytag;
145:
146: ######################################################################
147: ######################################################################
148:
149: =pod
150:
151: =item &handler() - main handler invoked by httpd child
152:
153: =item Variables
154:
155: =over 4
156:
157: =item $hidden
158:
159: holds 'hidden' html forms
160:
161: =item $scrout
162:
163: string that holds portions of the screen output
164:
165: =back
166:
167: =cut
168:
169: ######################################################################
170: ######################################################################
171: sub handler {
172: my $r = shift;
173: #
174:
175: my $loaderror=&Apache::lonnet::overloaderror($r);
176: if ($loaderror) { return $loaderror; }
177:
178: my $closebutton; # button that closes the search window
179: # This button is different for the RAT compared to
180: # normal invocation.
181: #
182: $r->content_type('text/html');
183: $r->send_http_header;
184: return OK if $r->header_only;
185: ##
186: ## Prevent caching of the search interface window. Hopefully this means
187: ## we will get the launch=1 passed in a little more.
188: &Apache::loncommon::no_cache($r);
189: ##
190: ## Pick up form fields passed in the links.
191: ##
192: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
193: ['catalogmode','launch','acts','mode','form','element','pause',
194: 'phase','persistent_db_id','table','start','show',
195: 'cleargroupsort']);
196: ##
197: ## The following is a trick - we wait a few seconds if asked to so
198: ## the daemon running the search can get ahead of the daemon
199: ## printing the results. We only need (theoretically) to do
200: ## this once, so the pause indicator is deleted
201: ##
202: if (exists($ENV{'form.pause'})) {
203: sleep(3);
204: delete($ENV{'form.pause'});
205: }
206: ##
207: ## Initialize global variables
208: ##
209: my $domain = $r->dir_config('lonDefDomain');
210: $diropendb= "/home/httpd/perl/tmp/".&Apache::lonnet::escape($domain).
211: "\_".&Apache::lonnet::escape($ENV{'user.name'})."_searchcat.db";
212: #
213: # set the name of the persistent database
214: # $ENV{'form.persistent_db_id'} can only have digits in it.
215: if (! exists($ENV{'form.persistent_db_id'}) ||
216: ($ENV{'form.persistent_db_id'} =~ /\D/) ||
217: ($ENV{'form.launch'} eq '1')) {
218: $ENV{'form.persistent_db_id'} = time;
219: }
220: $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
221: my $persistent_db_file = "/home/httpd/perl/tmp/".
222: &Apache::lonnet::escape($domain).
223: '_'.&Apache::lonnet::escape($ENV{'user.name'}).
224: '_'.$ENV{'form.persistent_db_id'}.'_persistent_search.db';
225: ##
226: if (! &get_persistent_form_data($persistent_db_file)) {
227: if ($ENV{'form.phase'} =~ /(run_search|results)/) {
228: &Apache::lonnet::logthis("lonsearchcat:Unable to recover data ".
229: "from $persistent_db_file");
230: $r->print(<<END);
231: <html>
232: <head><title>LON-CAPA Search Error</title></head>
233: $bodytag
234: We were unable to retrieve data describing your search. This is a serious
235: error and has been logged. Please alert your LON-CAPA administrator.
236: </body>
237: </html>
238: END
239: return OK;
240: }
241: }
242: ##
243: ## Clear out old values from groupsearch database
244: ##
245: untie %groupsearch_db if (tied(%groupsearch_db));
246: if (($ENV{'form.cleargroupsort'} eq '1') ||
247: (($ENV{'form.launch'} eq '1') &&
248: ($ENV{'form.catalogmode'} eq 'groupsearch'))) {
249: if (tie(%groupsearch_db,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) {
250: &start_fresh_session();
251: untie %groupsearch_db;
252: delete($ENV{'form.cleargroupsort'});
253: } else {
254: # This is a stupid error to give to the user.
255: # It really tells them nothing.
256: $r->print('<html><head></head>'.$bodytag.
257: 'Unable to tie hash to db file</body></html>');
258: return OK;
259: }
260: }
261: ##
262: ## Configure hidden fields
263: ##
264: $hidden_fields = '<input type="hidden" name="persistent_db_id" value="'.
265: $ENV{'form.persistent_db_id'}.'" />'."\n";
266: if (exists($ENV{'form.catalogmode'})) {
267: $hidden_fields .= '<input type="hidden" name="catalogmode" value="'.
268: $ENV{'form.catalogmode'}.'" />'."\n";
269: }
270: if (exists($ENV{'form.form'})) {
271: $hidden_fields .= '<input type="hidden" name="form" value="'.
272: $ENV{'form.form'}.'" />'."\n";
273: }
274: if (exists($ENV{'form.element'})) {
275: $hidden_fields .= '<input type="hidden" name="element" value="'.
276: $ENV{'form.element'}.'" />'."\n";
277: }
278: if (exists($ENV{'form.mode'})) {
279: $hidden_fields .= '<input type="hidden" name="mode" value="'.
280: $ENV{'form.mode'}.'" />'."\n";
281: }
282: ##
283: ## Configure dynamic components of interface
284: ##
285: if ($ENV{'form.catalogmode'} eq 'interactive') {
286: $closebutton="<input type='button' name='close' value='CLOSE' ";
287: if ($ENV{'form.phase'} =~ /(results|run_search)/) {
288: $closebutton .="onClick='parent.close()'";
289: } else {
290: $closebutton .="onClick='self.close()'";
291: }
292: $closebutton .=">\n";
293: } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') {
294: $closebutton="<input type='button' name='close' value='CLOSE' ";
295: if ($ENV{'form.phase'} =~ /(results|run_search)/) {
296: $closebutton .="onClick='parent.close()'";
297: } else {
298: $closebutton .="onClick='self.close()'";
299: }
300: $closebutton .= ">";
301: $importbutton=<<END;
302: <input type='button' name='import' value='IMPORT'
303: onClick='javascript:select_group()'>
304: END
305: } else {
306: $closebutton = '';
307: $importbutton = '';
308: }
309: ##
310: ## Sanity checks on form elements
311: ##
312: if (!defined($ENV{'form.viewselect'})) {
313: if (($ENV{'form.catalogmode'} eq 'groupsearch') ||
314: ($ENV{'form.catalogmode'} eq 'interactive')) {
315: $ENV{'form.viewselect'} ="Compact View";
316: } else {
317: $ENV{'form.viewselect'} ="Detailed Citation View";
318: }
319: }
320: $ENV{'form.phase'} = 'disp_basic' if (! exists($ENV{'form.phase'}));
321: $ENV{'form.show'} = 20 if (! exists($ENV{'form.show'}));
322: ##
323: ## Switch on the phase
324: ##
325: if ($ENV{'form.phase'} eq 'disp_basic') {
326: &print_basic_search_form($r,$closebutton);
327: } elsif ($ENV{'form.phase'} eq 'disp_adv') {
328: &print_advanced_search_form($r,$closebutton);
329: } elsif ($ENV{'form.phase'} eq 'results') {
330: &display_results($r,$importbutton,$closebutton);
331: } elsif ($ENV{'form.phase'} =~ /^(sort|run_search)$/) {
332: my ($query,$customquery,$customshow,$libraries,$pretty_string) =
333: &get_persistent_data($persistent_db_file,
334: ['query','customquery','customshow',
335: 'libraries','pretty_string']);
336: if ($ENV{'form.phase'} eq 'sort') {
337: &print_sort_form($r,$pretty_string);
338: } elsif ($ENV{'form.phase'} eq 'run_search') {
339: &run_search($r,$query,$customquery,$customshow,
340: $libraries,$pretty_string);
341: }
342: } elsif(($ENV{'form.phase'} eq 'basic_search') ||
343: ($ENV{'form.phase'} eq 'adv_search')) {
344: $ENV{'form.searchmode'} = 'basic';
345: if ($ENV{'form.phase'} eq 'adv_search') {
346: $ENV{'form.searchmode'} = 'advanced';
347: }
348: # Set up table
349: if (! defined(&create_results_table())) {
350: $r->print(<<END);
351: <html><head><title>Search Error</title></head>
352: $bodytag
353: Unable to create table in which to store search results.
354: The search has been aborted.
355: </body>
356: </html>
357: END
358: return OK;
359: }
360: delete($ENV{'form.launch'});
361: if (! &make_form_data_persistent($r,$persistent_db_file)) {
362: $r->print(<<END);
363: <html><head><title>Search Error</title></head>
364: $bodytag
365: Unable to properly store search information. The search has been aborted.
366: </body>
367: </html>
368: END
369: return OK;
370: }
371: #
372: # We are running a search
373: my ($query,$customquery,$customshow,$libraries) =
374: (undef,undef,undef,undef);
375: my $pretty_string;
376: if ($ENV{'form.phase'} eq 'basic_search') {
377: ($query,$pretty_string) = &parse_basic_search($r,$closebutton);
378: } else { # Advanced search
379: ($query,$customquery,$customshow,$libraries,$pretty_string)
380: = &parse_advanced_search($r,$closebutton);
381: return OK if (! defined($query));
382: }
383: &make_persistent({ query => $query,
384: customquery => $customquery,
385: customshow => $customshow,
386: libraries => $libraries,
387: pretty_string => $pretty_string },
388: $persistent_db_file);
389: ##
390: ## Print out the frames interface
391: ##
392: &print_frames_interface($r);
393: }
394: return OK;
395: }
396:
397: ######################################################################
398: ######################################################################
399:
400: =pod
401:
402: =item &print_basic_search_form()
403:
404: Returns a scalar which holds html for the basic search form.
405:
406: =cut
407:
408: ######################################################################
409: ######################################################################
410:
411: sub print_basic_search_form{
412: my ($r,$closebutton) = @_;
413: my $bodytag=&Apache::loncommon::bodytag('Catalog Search');
414: my $scrout=<<"ENDDOCUMENT";
415: <html>
416: <head>
417: <title>The LearningOnline Network with CAPA</title>
418: <script type="text/javascript">
419: function openhelp(val) {
420: openhelpwin=open('/adm/help/searchcat.html','helpscreen',
421: 'scrollbars=1,width=600,height=300');
422: openhelpwin.focus();
423: }
424: </script>
425: </head>
426: $bodytag
427: <form method="post" action="/adm/searchcat">
428: <input type="hidden" name="phase" value="basic_search" />
429: $hidden_fields
430: <p>
431: Enter terms or phrases separated by AND, OR, or NOT
432: then press SEARCH below.
433: </p>
434: <p>
435: <table>
436: <tr><td>
437: ENDDOCUMENT
438: $scrout.=' '.&simpletextfield('basicexp',$ENV{'form.basicexp'},40).
439: ' ';
440: my $checkbox = &simplecheckbox('related',$ENV{'form.related'});
441: $scrout.=<<END;
442: </td><td><a
443: href="/adm/searchcat?phase=disp_adv&catalogmode=$ENV{'form.catalogmode'}&launch=$ENV{'form.launch'}"
444: >Advanced Search</a></td></tr>
445: <tr><td>$checkbox use related words</td><td></td></tr>
446: </table>
447: </p>
448: <p>
449: <input type="submit" name="basicsubmit" value='SEARCH' />
450: $closebutton
451: END
452: $scrout.=&selectbox(undef,'viewselect',
453: $ENV{'form.viewselect'},
454: undef,undef,undef,
455: sort(keys(%Views)));
456: $scrout.=&selectbox(undef,'show',
457: $ENV{'form.show'},
458: undef,undef,undef,
459: (10,20,50,100));
460: $scrout.=<<ENDDOCUMENT;
461: per page.
462: </p>
463: </form>
464: </body>
465: </html>
466: ENDDOCUMENT
467: $r->print($scrout);
468: return;
469: }
470: ######################################################################
471: ######################################################################
472:
473: =pod
474:
475: =item &advanced_search_form()
476:
477: Returns a scalar which holds html for the advanced search form.
478:
479: =cut
480:
481: ######################################################################
482: ######################################################################
483:
484: sub print_advanced_search_form{
485: my ($r,$closebutton) = @_;
486: my $advanced_buttons = <<"END";
487: <p>
488: <input type="submit" name="advancedsubmit" value='SEARCH' />
489: <input type="reset" name="reset" value='RESET' />
490: $closebutton
491: <input type="button" value="HELP" onClick="openhelp()" />
492: </p>
493: END
494: if (!defined($ENV{'form.viewselect'})) {
495: $ENV{'form.viewselect'} ="Detailed Citation View";
496: }
497: my $bodytag=&Apache::loncommon::bodytag('Advanced Catalog Search');
498: my $scrout=<<"ENDHEADER";
499: <html>
500: <head>
501: <title>The LearningOnline Network with CAPA</title>
502: <script type="text/javascript">
503: function openhelp(val) {
504: openhelpwin=open('/adm/help/searchcat.html','helpscreen',
505: 'scrollbars=1,width=600,height=300');
506: openhelpwin.focus();
507: }
508: </script>
509: </head>
510: $bodytag
511: Enter terms or phrases separated by search operators
512: such as AND, OR, or NOT.<br />
513: <form method="post" action="/adm/searchcat">
514: $advanced_buttons
515: $hidden_fields
516: <input type="hidden" name="phase" value="adv_search" />
517: <table>
518: <tr><td><font color="#800000" face="helvetica"><b>VIEW:</b></font></td>
519: <td>
520: ENDHEADER
521: $scrout.=&selectbox(undef,'viewselect',
522: $ENV{'form.viewselect'},
523: undef,undef,undef,
524: sort(keys(%Views)));
525: $scrout.=' ';
526: $scrout.=&selectbox(undef,'show',
527: $ENV{'form.show'},
528: undef,undef,undef,
529: (10,20,50,100));
530: $scrout.=' '.
531: '<font color="#800000" face="helvetica">Per Page</font>';
532: $scrout.="</td><td>Related<br />Words</td></tr>\n";
533: $scrout.=&searchphrasefield_with_related('title', 'title' ,
534: $ENV{'form.title'});
535: $scrout.=&searchphrasefield('author', 'author' ,$ENV{'form.author'});
536: $scrout.=&searchphrasefield_with_related('subject', 'subject' ,
537: $ENV{'form.subject'});
538: $scrout.=&searchphrasefield_with_related('keywords','keywords',
539: $ENV{'form.keywords'});
540: $scrout.=&searchphrasefield('URL', 'url' ,$ENV{'form.url'});
541: $scrout.=&searchphrasefield_with_related('notes', 'notes' ,
542: $ENV{'form.notes'});
543: $scrout.=&searchphrasefield_with_related('abstract','abstract',
544: $ENV{'form.abstract'});
545: # Hack - an empty table row.
546: $scrout.="<tr><td> </td><td> </td><td> </td></tr>\n";
547: $scrout.=&searchphrasefield('file<br />extension','extension',
548: $ENV{'form.extension'});
549: $scrout.="<tr><td> </td><td> </td><td> </td></tr>\n";
550: $scrout.=&searchphrasefield('publisher<br />owner','owner',
551: $ENV{'form.owner'});
552: $scrout.="</table>\n";
553: $ENV{'form.category'}='any' if (! defined($ENV{'form.category'}));
554: $scrout.=&selectbox('File Category','category',
555: $ENV{'form.category'},
556: 'any','Any category',
557: undef,
558: (&Apache::loncommon::filecategories()));
559: $ENV{'form.language'}='any' unless length($ENV{'form.language'});
560: #----------------------------------------------------------------
561: # Allow restriction to multiple domains.
562: # I make the crazy assumption that there will never be a domain 'any'.
563: #
564: $ENV{'form.domains'} = 'any' if (! exists($ENV{'form.domains'}));
565: my @allowed_domains = (ref($ENV{'form.domains'}) ? @{$ENV{'form.domains'}}
566: : ($ENV{'form.domains'}) );
567: my %domain_hash = ();
568: foreach (@allowed_domains) {
569: $domain_hash{$_}++;
570: }
571: my @domains =&Apache::loncommon::get_domains();
572: # adjust the size of the select box
573: my $size = 4;
574: my $size = (scalar @domains < ($size - 1) ? scalar @domains + 1 : $size);
575: $scrout.="\n".'<font color="#800000" face="helvetica"><b>'.
576: 'DOMAINS</b></font><br />'.
577: '<select name="domains" size="'.$size.'" multiple>'."\n".
578: '<option name="any" value="any" '.
579: ($domain_hash{'any'}? 'selected ' :'').
580: '>all domains</option>'."\n";
581: foreach my $dom (sort @domains) {
582: $scrout.="<option name=\"$dom\" ".
583: ($domain_hash{$dom} ? 'selected ' :'').">$dom</option>\n";
584: }
585: $scrout.="</select>\n";
586: #----------------------------------------------------------------
587: $scrout.=&selectbox('Limit by language','language',
588: $ENV{'form.language'},'any','Any Language',
589: \&{Apache::loncommon::languagedescription},
590: (&Apache::loncommon::languageids),
591: );
592: # ------------------------------------------------ Compute date selection boxes
593: $scrout.=<<CREATIONDATESTART;
594: <p>
595: <font color="#800000" face="helvetica"><b>LIMIT BY CREATION DATE RANGE:</b>
596: </font>
597: <br />
598: between:
599: CREATIONDATESTART
600: $scrout.=&dateboxes('creationdatestart',1,1,1976,
601: $ENV{'form.creationdatestart_month'},
602: $ENV{'form.creationdatestart_day'},
603: $ENV{'form.creationdatestart_year'},
604: );
605: $scrout.="and:\n";
606: $scrout.=&dateboxes('creationdateend',12,31,2051,
607: $ENV{'form.creationdateend_month'},
608: $ENV{'form.creationdateend_day'},
609: $ENV{'form.creationdateend_year'},
610: );
611: $scrout.="</p>";
612: $scrout.=<<LASTREVISIONDATESTART;
613: <p>
614: <font color="#800000" face="helvetica"><b>LIMIT BY LAST REVISION DATE RANGE:
615: </b></font>
616: <br />between:
617: LASTREVISIONDATESTART
618: $scrout.=&dateboxes('lastrevisiondatestart',1,1,1976,
619: $ENV{'form.lastrevisiondatestart_month'},
620: $ENV{'form.lastrevisiondatestart_day'},
621: $ENV{'form.lastrevisiondatestart_year'},
622: );
623: $scrout.=<<LASTREVISIONDATEEND;
624: and:
625: LASTREVISIONDATEEND
626: $scrout.=&dateboxes('lastrevisiondateend',12,31,2051,
627: $ENV{'form.lastrevisiondateend_month'},
628: $ENV{'form.lastrevisiondateend_day'},
629: $ENV{'form.lastrevisiondateend_year'},
630: );
631: $scrout.='</p>';
632: $ENV{'form.copyright'}='any' unless length($ENV{'form.copyright'});
633: $scrout.=&selectbox('Limit by copyright/distribution','copyright',
634: $ENV{'form.copyright'},
635: 'any','Any copyright/distribution',
636: \&{Apache::loncommon::copyrightdescription},
637: (&Apache::loncommon::copyrightids),
638: );
639: # ------------------------------------------- Compute customized metadata field
640: # $scrout.=<<CUSTOMMETADATA;
641: #<p>
642: #<font color="#800000" face="helvetica"><b>LIMIT BY SPECIAL METADATA FIELDS:</b>
643: #</font>
644: #For resource-specific metadata, enter in an expression in the form of
645: #<i>key</i>=<i>value</i> separated by operators such as AND, OR or NOT.<br />
646: #<b>Example:</b> grandmother=75 OR grandfather=85
647: #<br />
648: #CUSTOMMETADATA
649: # $scrout.=&simpletextfield('custommetadata',$ENV{'form.custommetadata'});
650: # $scrout.=<<CUSTOMSHOW;
651: #<p>
652: #<font color="#800000" face="helvetica"><b>SHOW SPECIAL METADATA FIELDS:</b>
653: #</font>
654: #Enter in a space-separated list of special metadata fields to show
655: #in a fielded listing for each record result.
656: #<br />
657: #CUSTOMSHOW
658: # $scrout.=&simpletextfield('customshow',$ENV{'form.customshow'});
659: $scrout.=<<ENDDOCUMENT;
660: $advanced_buttons
661: </form>
662: </body>
663: </html>
664: ENDDOCUMENT
665: $r->print($scrout);
666: return;
667: }
668:
669: ######################################################################
670: ######################################################################
671:
672: =pod
673:
674: =item &get_persistent_form_data
675:
676: Inputs: filename of database
677:
678: Outputs: returns undef on database errors.
679:
680: This function is the reverse of &make_persistent() for form data.
681: Retrieve persistent data from %persistent_db. Retrieved items will have their
682: values unescaped. If a form value already exists in $ENV, it will not be
683: overwritten. Form values that are array references may have values appended
684: to them.
685:
686: =cut
687:
688: ######################################################################
689: ######################################################################
690: sub get_persistent_form_data {
691: my $filename = shift;
692: return 0 if (! -e $filename);
693: return undef if (! tie(%persistent_db,'GDBM_File',$filename,
694: &GDBM_READER(),0640));
695: #
696: # These make sure we do not get array references printed out as 'values'.
697: my %arrays_allowed = ('form.domains'=>1);
698: #
699: # Loop through the keys, looking for 'form.'
700: foreach my $name (keys(%persistent_db)) {
701: next if ($name !~ /^form./);
702: next if (exists($ENV{$name}));
703: my @values = map {
704: &Apache::lonnet::unescape($_);
705: } split(',',$persistent_db{$name});
706: next if (@values <1);
707: if ($arrays_allowed{$name}) {
708: $ENV{$name} = [@values];
709: } else {
710: $ENV{$name} = $values[0] if ($values[0]);
711: }
712: }
713: untie (%persistent_db);
714: return 1;
715: }
716: ######################################################################
717: ######################################################################
718:
719: =pod
720:
721: =item &get_persistent_data
722:
723: Inputs: filename of database, ref to array of values to recover.
724:
725: Outputs: array of values. Returns undef on error.
726:
727: This function is the reverse of &make_persistent();
728: Retrieve persistent data from %persistent_db. Retrieved items will have their
729: values unescaped. If the item contains commas (before unescaping), the
730: returned value will be an array pointer.
731:
732: =cut
733:
734: ######################################################################
735: ######################################################################
736: sub get_persistent_data {
737: my $filename = shift;
738: my @Vars = @{shift()};
739: my @Values; # Return array
740: return undef if (! -e $filename);
741: return undef if (! tie(%persistent_db,'GDBM_File',$filename,
742: &GDBM_READER(),0640));
743: foreach my $name (@Vars) {
744: if (! exists($persistent_db{$name})) {
745: push @Values, undef;
746: next;
747: }
748: my @values = map {
749: &Apache::lonnet::unescape($_);
750: } split(',',$persistent_db{$name});
751: if (@values <= 1) {
752: push @Values,$values[0];
753: } else {
754: push @Values,\@values;
755: }
756: }
757: untie (%persistent_db);
758: return @Values;
759: }
760:
761: ######################################################################
762: ######################################################################
763:
764: =pod
765:
766: =item &make_persistent()
767:
768: Inputs: Hash of values to save, filename of persistent database.
769:
770: Store variables away to the %persistent_db.
771: Values will be escaped. Values that are array pointers will have their
772: elements escaped and concatenated in a comma seperated string.
773:
774: =cut
775:
776: ######################################################################
777: ######################################################################
778: sub make_persistent {
779: my %save = %{shift()};
780: my $filename = shift;
781: return undef if (! tie(%persistent_db,'GDBM_File',
782: $filename,&GDBM_WRCREAT(),0640));
783: foreach my $name (keys(%save)) {
784: my @values = (ref($save{$name}) ? @{$save{$name}} : ($save{$name}));
785: # We handle array references, but not recursively.
786: my $store = join(',', map { &Apache::lonnet::escape($_); } @values );
787: $persistent_db{$name} = $store;
788: }
789: untie(%persistent_db);
790: return 1;
791: }
792:
793: ######################################################################
794: ######################################################################
795:
796: =pod
797:
798: =item &make_form_data_persistent()
799:
800: Inputs: filename of persistent database.
801:
802: Store most form variables away to the %persistent_db.
803: Values will be escaped. Values that are array pointers will have their
804: elements escaped and concatenated in a comma seperated string.
805:
806: =cut
807:
808: ######################################################################
809: ######################################################################
810: sub make_form_data_persistent {
811: my $r = shift;
812: my $filename = shift;
813: my %save;
814: foreach (keys(%ENV)) {
815: next if (!/^form/ || /submit/);
816: $save{$_} = $ENV{$_};
817: }
818: return &make_persistent(\%save,$filename);
819: }
820:
821: ######################################################################
822: # HTML form building functions #
823: ######################################################################
824:
825: =pod
826:
827: =item HTML form building functions
828:
829: =over 4
830:
831: =cut
832:
833: ###############################################
834: ###############################################
835:
836: =pod
837:
838: =item &simpletextfield()
839:
840: Inputs: $name,$value,$size
841:
842: Returns a text input field with the given name, value, and size.
843: If size is not specified, a value of 20 is used.
844:
845: =cut
846:
847: ###############################################
848: ###############################################
849:
850: sub simpletextfield {
851: my ($name,$value,$size)=@_;
852: $size = 20 if (! defined($size));
853: return '<input type="text" name="'.$name.
854: '" size="'.$size.'" value="'.$value.'" />';
855: }
856:
857: ###############################################
858: ###############################################
859:
860: =pod
861:
862: =item &simplecheckbox()
863:
864: Inputs: $name,$value
865:
866: Returns a simple check box with the given $name.
867: If $value eq 'on' the box is checked.
868:
869: =cut
870:
871: ###############################################
872: ###############################################
873:
874: sub simplecheckbox {
875: my ($name,$value)=@_;
876: my $checked='';
877: $checked="checked" if $value eq 'on';
878: return '<input type="checkbox" name="'.$name.'" '. $checked . ' />';
879: }
880:
881: ###############################################
882: ###############################################
883:
884: =pod
885:
886: =item &fieldtitle()
887:
888: Input: $title
889:
890: Returns a scalar with html which will display $title as a search
891: field heading.
892:
893: =cut
894:
895: ###############################################
896: ###############################################
897:
898: sub fieldtitle {
899: my $title = uc(shift());
900: return '<font color="#800000" face="helvetica"><b>'.$title.
901: ': </b></font>';
902: }
903:
904: ###############################################
905: ###############################################
906:
907: =pod
908:
909: =item &searchphrasefield()
910:
911: Inputs: $title,$name,$value
912:
913: Returns html for a title line and an input field for entering search terms.
914: The entry field (which is where the $name and $value are used) is a 50 column
915: simpletextfield. The html returned is for a row in a three column table.
916:
917: =cut
918:
919: ###############################################
920: ###############################################
921:
922: sub searchphrasefield {
923: my ($title,$name,$value)=@_;
924: return '<tr><td>'.&fieldtitle($title).'</td><td>'.
925: &simpletextfield($name,$value,50)."</td><td> </td></tr>\n";
926: }
927:
928: ###############################################
929: ###############################################
930:
931: =pod
932:
933: =item &searchphrasefield_with_related()
934:
935: Inputs: $title,$name,$value
936:
937: Returns html for a title line and an input field for entering search terms
938: and a check box for 'related words'. The entry field (which is where the
939: $name and $value are used) is a 50 column simpletextfield. The name of
940: the related words checkbox is "$name_related".
941:
942: =cut
943:
944: ###############################################
945: ###############################################
946:
947: sub searchphrasefield_with_related {
948: my ($title,$name,$value)=@_;
949: return '<tr><td>'.&fieldtitle($title).'</td><td>'.
950: &simpletextfield($name,$value,50).'</td><td align="center"> '.
951: &simplecheckbox($name.'_related',$ENV{'form.'.$name.'_related'}).
952: " </td></tr>\n";
953: }
954:
955: ###############################################
956: ###############################################
957:
958: =pod
959:
960: =item &dateboxes()
961:
962: Returns html selection form elements for the specification of
963: the day, month, and year.
964:
965: =cut
966:
967: ###############################################
968: ###############################################
969:
970: sub dateboxes {
971: my ($name,$defaultmonth,$defaultday,$defaultyear,
972: $currentmonth,$currentday,$currentyear)=@_;
973: ($defaultmonth,$defaultday,$defaultyear)=('','','');
974: #
975: # Day
976: my $day=<<END;
977: <select name="${name}_day">
978: <option value='$defaultday'> </option>
979: END
980: for (my $i = 1; $i<=31; $i++) {
981: $day.="<option value=\"$i\">$i</option>\n";
982: }
983: $day.="</select>\n";
984: $day=~s/(\"$currentday\")/$1 SELECTED/ if length($currentday);
985: #
986: # Month
987: my $month=<<END;
988: <select name="${name}_month">
989: <option value='$defaultmonth'> </option>
990: END
991: my $i = 1;
992: foreach (qw/January February March April May June
993: July August September October November December /){
994: $month .="<option value=\"$i\">$_</option>\n";
995: $i++;
996: }
997: $month.="</select>\n";
998: $month=~s/(\"$currentmonth\")/$1 SELECTED/ if length($currentmonth);
999: #
1000: # Year (obviously)
1001: my $year=<<END;
1002: <select name="${name}_year">
1003: <option value='$defaultyear'> </option>
1004: END
1005: my $maxyear = 2051;
1006: for (my $i = 1976; $i<=$maxyear; $i++) {
1007: $year.="<option value=\"$i\">$i</option>\n";
1008: }
1009: $year.="</select>\n";
1010: $year=~s/(\"$currentyear\")/$1 SELECTED/ if length($currentyear);
1011: return "$month$day$year";
1012: }
1013:
1014: ###############################################
1015: ###############################################
1016:
1017: =pod
1018:
1019: =item &selectbox()
1020:
1021: Returns a scalar containing an html <select> form.
1022:
1023: Inputs:
1024:
1025: =over 4
1026:
1027: =item $title
1028:
1029: Printed above the select box, in uppercase. If undefined, only a select
1030: box will be returned, with no additional html.
1031:
1032: =item $name
1033:
1034: The name element of the <select> tag.
1035:
1036: =item $default
1037:
1038: The default value of the form. Can be $anyvalue, or in @idlist.
1039:
1040: =item $anyvalue
1041:
1042: The <option value="..."> used to indicate a default of
1043: none of the values. Can be undef.
1044:
1045: =item $anytag
1046:
1047: The text associate with $anyvalue above.
1048:
1049: =item $functionref
1050:
1051: Each element in @idlist will be passed as a parameter
1052: to the function referenced here. The return value of the function should
1053: be a scalar description of the items. If this value is undefined the
1054: description of each item in @idlist will be the item name.
1055:
1056: =item @idlist
1057:
1058: The items to be selected from. One of these or $anyvalue will be the
1059: value returned by the form element, $ENV{form.$name}.
1060:
1061: =back
1062:
1063: =cut
1064:
1065: ###############################################
1066:
1067: sub selectbox {
1068: my ($title,$name,$default,$anyvalue,$anytag,$functionref,@idlist)=@_;
1069: if (! defined($functionref)) { $functionref = sub { $_[0]}; }
1070: my $selout='';
1071: if (defined($title)) {
1072: my $uctitle=uc($title);
1073: $selout="\n".'<p><font color="#800000" face="helvetica">'.
1074: '<b>'.$uctitle.': </b></font>';
1075: }
1076: $selout .= '<select name="'.$name.'">';
1077: unshift @idlist,$anyvalue if (defined($anyvalue));
1078: foreach (@idlist) {
1079: $selout.='<option value="'.$_.'"';
1080: if ($_ eq $default and !/^any$/) {
1081: $selout.=' selected >'.&{$functionref}($_).'</option>';
1082: }
1083: elsif ($_ eq $default and /^$anyvalue$/) {
1084: $selout.=' selected >'.$anytag.'</option>';
1085: }
1086: else {$selout.='>'.&{$functionref}($_).'</option>';}
1087: }
1088: return $selout.'</select>'.(defined($title)?'</p>':' ');
1089: }
1090:
1091: ######################################################################
1092: # End of HTML form building functions #
1093: ######################################################################
1094:
1095: =pod
1096:
1097: =back
1098:
1099: =cut
1100:
1101:
1102: ######################################################################
1103: ######################################################################
1104:
1105: =pod
1106:
1107: =item &parse_advanced_search()
1108:
1109: Parse advanced search form and return the following:
1110:
1111: =over 4
1112:
1113: =item $query Scalar containing an SQL query.
1114:
1115: =item $customquery Scalar containing a custom query.
1116:
1117: =item $customshow Scalar containing commands to show custom metadata.
1118:
1119: =item $libraries_to_query Reference to array of domains to search.
1120:
1121: =back
1122:
1123: =cut
1124:
1125: ######################################################################
1126: ######################################################################
1127: sub parse_advanced_search {
1128: my ($r,$closebutton)=@_;
1129: my $fillflag=0;
1130: my $pretty_search_string = "<br />\n";
1131: # Clean up fields for safety
1132: for my $field ('title','author','subject','keywords','url','version',
1133: 'creationdatestart_month','creationdatestart_day',
1134: 'creationdatestart_year','creationdateend_month',
1135: 'creationdateend_day','creationdateend_year',
1136: 'lastrevisiondatestart_month','lastrevisiondatestart_day',
1137: 'lastrevisiondatestart_year','lastrevisiondateend_month',
1138: 'lastrevisiondateend_day','lastrevisiondateend_year',
1139: 'notes','abstract','extension','language','owner',
1140: 'custommetadata','customshow','category') {
1141: $ENV{"form.$field"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1142: }
1143: foreach ('mode','form','element') {
1144: # is this required? Hmmm.
1145: next unless (exists($ENV{"form.$_"}));
1146: $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"});
1147: $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1148: }
1149: # Preprocess the category form element.
1150: $ENV{'form.category'} = 'any' if (! defined($ENV{'form.category'}) ||
1151: ref($ENV{'form.category'}));
1152: #
1153: # Check to see if enough information was filled in
1154: for my $field ('title','author','subject','keywords','url','version',
1155: 'notes','abstract','category','extension','language',
1156: 'owner','custommetadata') {
1157: if (&filled($ENV{"form.$field"})) {
1158: $fillflag++;
1159: }
1160: }
1161: unless ($fillflag) {
1162: &output_blank_field_error($r,$closebutton,'phase=disp_adv');
1163: return ;
1164: }
1165: # Turn the form input into a SQL-based query
1166: my $query='';
1167: my @queries;
1168: my $font = '<font color="#800000" face="helvetica">';
1169: # Evaluate logical expression AND/OR/NOT phrase fields.
1170: foreach my $field ('title','author','subject','notes','abstract','url',
1171: 'keywords','version','owner') {
1172: if ($ENV{'form.'.$field}) {
1173: my $searchphrase = $ENV{'form.'.$field};
1174: $pretty_search_string .= $font."$field</font> contains <b>".
1175: $searchphrase."</b>";
1176: if ($ENV{'form.'.$field.'_related'}) {
1177: my @New_Words;
1178: ($searchphrase,@New_Words) = &related_version($searchphrase);
1179: if (@New_Words) {
1180: $pretty_search_string .= " with related words: ".
1181: "<b>@New_Words</b>.";
1182: } else {
1183: $pretty_search_string .= " with no related words.";
1184: }
1185: }
1186: $pretty_search_string .= "<br />\n";
1187: push @queries,&build_SQL_query($field,$searchphrase);
1188: }
1189: }
1190: #
1191: # Make the 'mime' from 'form.category' and 'form.extension'
1192: #
1193: my $searchphrase;
1194: if (exists($ENV{'form.category'}) &&
1195: $ENV{'form.category'} !~ /^\s*$/ &&
1196: $ENV{'form.category'} ne 'any') {
1197: my @extensions = &Apache::loncommon::filecategorytypes
1198: ($ENV{'form.category'});
1199: if (scalar(@extensions) > 0) {
1200: $searchphrase = join(' OR ',@extensions);
1201: }
1202: }
1203: if (exists($ENV{'form.extension'}) && $ENV{'form.extension'} !~ /^\s*$/) {
1204: $searchphrase .= ' OR ' if (defined($searchphrase));
1205: my @extensions = split(/,/,$ENV{'form.extension'});
1206: $searchphrase .= join(' OR ',@extensions);
1207: }
1208: if (defined($searchphrase)) {
1209: push @queries,&build_SQL_query('mime',$searchphrase);
1210: $pretty_search_string .=$font.'mime</font> contains <b>'.
1211: $searchphrase.'</b><br />';
1212: }
1213: #####
1214: # Evaluate option lists
1215: if ($ENV{'form.language'} and $ENV{'form.language'} ne 'any') {
1216: push @queries,"(language like \"$ENV{'form.language'}\")";
1217: $pretty_search_string.=$font."language</font>= ".
1218: &Apache::loncommon::languagedescription($ENV{'form.language'}).
1219: "<br />\n";
1220: }
1221: if ($ENV{'form.copyright'} and $ENV{'form.copyright'} ne 'any') {
1222: push @queries,"(copyright like \"$ENV{'form.copyright'}\")";
1223: $pretty_search_string.=$font."copyright</font> = ".
1224: &Apache::loncommon::copyrightdescription($ENV{'form.copyright'}).
1225: "<br \>\n";
1226: }
1227: #
1228: # Evaluate date windows
1229: my $datequery=&build_date_queries(
1230: $ENV{'form.creationdatestart_month'},
1231: $ENV{'form.creationdatestart_day'},
1232: $ENV{'form.creationdatestart_year'},
1233: $ENV{'form.creationdateend_month'},
1234: $ENV{'form.creationdateend_day'},
1235: $ENV{'form.creationdateend_year'},
1236: $ENV{'form.lastrevisiondatestart_month'},
1237: $ENV{'form.lastrevisiondatestart_day'},
1238: $ENV{'form.lastrevisiondatestart_year'},
1239: $ENV{'form.lastrevisiondateend_month'},
1240: $ENV{'form.lastrevisiondateend_day'},
1241: $ENV{'form.lastrevisiondateend_year'},
1242: );
1243: # Test to see if date windows are legitimate
1244: if ($datequery=~/^Incorrect/) {
1245: &output_date_error($r,$datequery,$closebutton);
1246: return ;
1247: } elsif ($datequery) {
1248: # Here is where you would set up pretty_search_string to output
1249: # date query information.
1250: push @queries,$datequery;
1251: }
1252: # Process form information for custom metadata querying
1253: my $customquery=undef;
1254: # if ($ENV{'form.custommetadata'}) {
1255: # $pretty_search_string .=$font."Custom Metadata Search</font>: <b>".
1256: # $ENV{'form.custommetadata'}."</b><br />\n";
1257: # $customquery=&build_custommetadata_query('custommetadata',
1258: # $ENV{'form.custommetadata'});
1259: # }
1260: my $customshow=undef;
1261: # if ($ENV{'form.customshow'}) {
1262: # $pretty_search_string .=$font."Custom Metadata Display</font>: <b>".
1263: # $ENV{'form.customshow'}."</b><br />\n";
1264: # $customshow=$ENV{'form.customshow'};
1265: # $customshow=~s/[^\w\s]//g;
1266: # my @fields=split(/\s+/,$customshow);
1267: # $customshow=join(" ",@fields);
1268: # }
1269: ## ---------------------------------------------------------------
1270: ## Deal with restrictions to given domains
1271: ##
1272: my $libraries_to_query = undef;
1273: # $ENV{'form.domains'} can be either a scalar or an array reference.
1274: # We need an array.
1275: my @allowed_domains = (ref($ENV{'form.domains'}) ? @{$ENV{'form.domains'}}
1276: : ($ENV{'form.domains'}) );
1277: my %domain_hash = ();
1278: my $pretty_domains_string;
1279: foreach (@allowed_domains) {
1280: $domain_hash{$_}++;
1281: }
1282: if ($domain_hash{'any'}) {
1283: $pretty_domains_string = "In all LON-CAPA domains.";
1284: } else {
1285: if (@allowed_domains > 1) {
1286: $pretty_domains_string = "In LON-CAPA domains:";
1287: } else {
1288: $pretty_domains_string = "In LON-CAPA domain ";
1289: }
1290: foreach (sort @allowed_domains) {
1291: $pretty_domains_string .= "<b>".$_."</b> ";
1292: }
1293: foreach (keys(%Apache::lonnet::libserv)) {
1294: if (exists($domain_hash{$Apache::lonnet::hostdom{$_}})) {
1295: push @$libraries_to_query,$_;
1296: }
1297: }
1298: }
1299: $pretty_search_string .= $pretty_domains_string."<br />\n";
1300: #
1301: if (@queries) {
1302: $query=join(" AND ",@queries);
1303: $query="select * from metadata where $query";
1304: } elsif ($customquery) {
1305: $query = '';
1306: }
1307: return ($query,$customquery,$customshow,$libraries_to_query,
1308: $pretty_search_string);
1309: }
1310:
1311: ######################################################################
1312: ######################################################################
1313:
1314: =pod
1315:
1316: =item &parse_basic_search()
1317:
1318: Parse the basic search form and return a scalar containing an sql query.
1319:
1320: =cut
1321:
1322: ######################################################################
1323: ######################################################################
1324: sub parse_basic_search {
1325: my ($r,$closebutton)=@_;
1326: # Clean up fields for safety
1327: for my $field ('basicexp') {
1328: $ENV{"form.$field"}=~s/[^\w\s\(\)\-]//g;
1329: }
1330: foreach ('mode','form','element') {
1331: # is this required? Hmmm.
1332: next unless (exists($ENV{"form.$_"}));
1333: $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"});
1334: $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1335: }
1336:
1337: # Check to see if enough is filled in
1338: unless (&filled($ENV{'form.basicexp'})) {
1339: &output_blank_field_error($r,$closebutton,'phase=disp_basic');
1340: return OK;
1341: }
1342: my $pretty_search_string = '<b>'.$ENV{'form.basicexp'}.'</b>';
1343: my $search_string = $ENV{'form.basicexp'};
1344: if ($ENV{'form.related'}) {
1345: my @New_Words;
1346: ($search_string,@New_Words) = &related_version($ENV{'form.basicexp'});
1347: if (@New_Words) {
1348: $pretty_search_string .= " with related words: <b>@New_Words</b>.";
1349: } else {
1350: $pretty_search_string .= " with no related words.";
1351: }
1352: }
1353: # Build SQL query string based on form page
1354: my $query='';
1355: my $concatarg=join('," ",',
1356: ('title', 'author', 'subject', 'notes', 'abstract',
1357: 'keywords'));
1358: $concatarg='title' if $ENV{'form.titleonly'};
1359: $query=&build_SQL_query('concat('.$concatarg.')',$search_string);
1360: $pretty_search_string .= "<br />\n";
1361: return 'select * from metadata where '.$query,$pretty_search_string;
1362: }
1363:
1364:
1365: ######################################################################
1366: ######################################################################
1367:
1368: =pod
1369:
1370: =item &related_version
1371:
1372: Modifies an input string to include related words. Words in the string
1373: are replaced with parenthesized lists of 'OR'd words. For example
1374: "torque" is replaced with "(torque OR word1 OR word2 OR ...)".
1375:
1376: Note: Using this twice on a string is probably silly.
1377:
1378: =cut
1379:
1380: ######################################################################
1381: ######################################################################
1382: sub related_version {
1383: my $search_string = shift;
1384: my $result = $search_string;
1385: my %New_Words = ();
1386: while ($search_string =~ /(\w+)/cg) {
1387: my $word = $1;
1388: next if (lc($word) =~ /\b(or|and|not)\b/);
1389: my @Words = &Apache::loncommon::get_related_words($word);
1390: @Words = ($#Words>4? @Words[0..4] : @Words);
1391: foreach (@Words) { $New_Words{$_}++;}
1392: my $replacement = join " OR ", ($word,@Words);
1393: $result =~ s/(\b)$word(\b)/$1($replacement)$2/g;
1394: }
1395: return $result,sort(keys(%New_Words));
1396: }
1397:
1398: ######################################################################
1399: ######################################################################
1400:
1401: =pod
1402:
1403: =item &build_SQL_query()
1404:
1405: Builds a SQL query string from a logical expression with AND/OR keywords
1406: using Text::Query and &recursive_SQL_query_builder()
1407:
1408: =cut
1409:
1410: ######################################################################
1411: ######################################################################
1412: sub build_SQL_query {
1413: my ($field_name,$logic_statement)=@_;
1414: my $q=new Text::Query('abc',
1415: -parse => 'Text::Query::ParseAdvanced',
1416: -build => 'Text::Query::Build');
1417: $q->prepare($logic_statement);
1418: my $matchexp=${$q}{'matchexp'}; chomp $matchexp;
1419: my $sql_query=&recursive_SQL_query_build($field_name,$matchexp);
1420: return $sql_query;
1421: }
1422:
1423: ######################################################################
1424: ######################################################################
1425:
1426: =pod
1427:
1428: =item &build_custommetadata_query()
1429:
1430: Constructs a custom metadata query using a rather heinous regular
1431: expression.
1432:
1433: =cut
1434:
1435: ######################################################################
1436: ######################################################################
1437: sub build_custommetadata_query {
1438: my ($field_name,$logic_statement)=@_;
1439: my $q=new Text::Query('abc',
1440: -parse => 'Text::Query::ParseAdvanced',
1441: -build => 'Text::Query::BuildAdvancedString');
1442: $q->prepare($logic_statement);
1443: my $matchexp=${$q}{'-parse'}{'-build'}{'matchstring'};
1444: # quick fix to change literal into xml tag-matching
1445: # will eventually have to write a separate builder module
1446: # wordone=wordtwo becomes\<wordone\>[^\<] *wordtwo[^\<]*\<\/wordone\>
1447: $matchexp =~ s/(\w+)\\=([\w\\\+]+)?# wordone=wordtwo is changed to
1448: /\\<$1\\>?# \<wordone\>
1449: \[\^\\<\]?# [^\<]
1450: \*$2\[\^\\<\]?# *wordtwo[^\<]
1451: \*\\<\\\/$1\\>?# *\<\/wordone\>
1452: /g;
1453: return $matchexp;
1454: }
1455:
1456: ######################################################################
1457: ######################################################################
1458:
1459: =pod
1460:
1461: =item &recursive_SQL_query_build()
1462:
1463: Recursively constructs an SQL query. Takes as input $dkey and $pattern.
1464:
1465: =cut
1466:
1467: ######################################################################
1468: ######################################################################
1469: sub recursive_SQL_query_build {
1470: my ($dkey,$pattern)=@_;
1471: my @matches=($pattern=~/(\[[^\]|\[]*\])/g);
1472: return $pattern unless @matches;
1473: foreach my $match (@matches) {
1474: $match=~/\[ (\w+)\s(.*) \]/;
1475: my ($key,$value)=($1,$2);
1476: my $replacement='';
1477: if ($key eq 'literal') {
1478: $replacement="($dkey like \"\%$value\%\")";
1479: }
1480: elsif ($key eq 'not') {
1481: $value=~s/like/not like/;
1482: # $replacement="($dkey not like $value)";
1483: $replacement="$value";
1484: }
1485: elsif ($key eq 'and') {
1486: $value=~/(.*[\"|\)]) ([|\(|\^].*)/;
1487: $replacement="($1 AND $2)";
1488: }
1489: elsif ($key eq 'or') {
1490: $value=~/(.*[\"|\)]) ([|\(|\^].*)/;
1491: $replacement="($1 OR $2)";
1492: }
1493: substr($pattern,
1494: index($pattern,$match),
1495: length($match),
1496: $replacement
1497: );
1498: }
1499: &recursive_SQL_query_build($dkey,$pattern);
1500: }
1501:
1502: ######################################################################
1503: ######################################################################
1504:
1505: =pod
1506:
1507: =item &build_date_queries()
1508:
1509: Builds a SQL logic query to check time/date entries.
1510: Also reports errors (check for /^Incorrect/).
1511:
1512: =cut
1513:
1514: ######################################################################
1515: ######################################################################
1516: sub build_date_queries {
1517: my ($cmonth1,$cday1,$cyear1,$cmonth2,$cday2,$cyear2,
1518: $lmonth1,$lday1,$lyear1,$lmonth2,$lday2,$lyear2)=@_;
1519: my @queries;
1520: if ($cmonth1 or $cday1 or $cyear1 or $cmonth2 or $cday2 or $cyear2) {
1521: unless ($cmonth1 and $cday1 and $cyear1 and
1522: $cmonth2 and $cday2 and $cyear2) {
1523: return "Incorrect entry for the creation date. You must specify ".
1524: "a starting month, day, and year and an ending month, ".
1525: "day, and year.";
1526: }
1527: my $cnumeric1=sprintf("%d%2d%2d",$cyear1,$cmonth1,$cday1);
1528: $cnumeric1+=0;
1529: my $cnumeric2=sprintf("%d%2d%2d",$cyear2,$cmonth2,$cday2);
1530: $cnumeric2+=0;
1531: if ($cnumeric1>$cnumeric2) {
1532: return "Incorrect entry for the creation date. The starting ".
1533: "date must occur before the ending date.";
1534: }
1535: my $cquery="(creationdate BETWEEN '$cyear1-$cmonth1-$cday1' AND '".
1536: "$cyear2-$cmonth2-$cday2 23:59:59')";
1537: push @queries,$cquery;
1538: }
1539: if ($lmonth1 or $lday1 or $lyear1 or $lmonth2 or $lday2 or $lyear2) {
1540: unless ($lmonth1 and $lday1 and $lyear1 and
1541: $lmonth2 and $lday2 and $lyear2) {
1542: return "Incorrect entry for the last revision date. You must ".
1543: "specify a starting month, day, and year and an ending ".
1544: "month, day, and year.";
1545: }
1546: my $lnumeric1=sprintf("%d%2d%2d",$lyear1,$lmonth1,$lday1);
1547: $lnumeric1+=0;
1548: my $lnumeric2=sprintf("%d%2d%2d",$lyear2,$lmonth2,$lday2);
1549: $lnumeric2+=0;
1550: if ($lnumeric1>$lnumeric2) {
1551: return "Incorrect entry for the last revision date. The ".
1552: "starting date must occur before the ending date.";
1553: }
1554: my $lquery="(lastrevisiondate BETWEEN '$lyear1-$lmonth1-$lday1' AND '".
1555: "$lyear2-$lmonth2-$lday2 23:59:59')";
1556: push @queries,$lquery;
1557: }
1558: if (@queries) {
1559: return join(" AND ",@queries);
1560: }
1561: return '';
1562: }
1563:
1564: ######################################################################
1565: ######################################################################
1566:
1567: =pod
1568:
1569: =item ©right_check()
1570:
1571: =cut
1572:
1573: ######################################################################
1574: ######################################################################
1575: sub copyright_check {
1576: my $Metadata = shift;
1577: # Check copyright tags and skip results the user cannot use
1578: my (undef,undef,$resdom,$resname) = split('/',
1579: $Metadata->{'url'});
1580: # Check for priv
1581: if (($Metadata->{'copyright'} eq 'priv') &&
1582: (($ENV{'user.name'} ne $resname) &&
1583: ($ENV{'user.domain'} ne $resdom))) {
1584: return 0;
1585: }
1586: # Check for domain
1587: if (($Metadata->{'copyright'} eq 'domain') &&
1588: ($ENV{'user.domain'} ne $resdom)) {
1589: return 0;
1590: }
1591: return 1;
1592: }
1593:
1594:
1595: ######################################################################
1596: ######################################################################
1597:
1598: =pod
1599:
1600: =item &ensure_db_and_table
1601:
1602: Ensure we can get lonmysql to connect to the database and the table we
1603: need exists.
1604:
1605: Inputs: $r, table id
1606:
1607: Returns: undef on error, 1 if the table exists.
1608:
1609: =cut
1610:
1611: ######################################################################
1612: ######################################################################
1613: sub ensure_db_and_table {
1614: my ($r,$table) = @_;
1615: ##
1616: ## Sanity check the table id.
1617: ##
1618: if (! defined($table) || $table eq '' || $table =~ /\D/ ) {
1619: $r->print("Unable to retrieve search results. ".
1620: "Unable to determine the table results were stored in. ".
1621: "</body></html>");
1622: return undef;
1623: }
1624: ##
1625: ## Make sure we can connect and the table exists.
1626: ##
1627: my $connection_result = &Apache::lonmysql::connect_to_db();
1628: if (!defined($connection_result)) {
1629: $r->print("Unable to connect to the MySQL database where your results".
1630: " are stored. </body></html>");
1631: &Apache::lonnet::logthis("lonsearchcat: unable to get lonmysql to".
1632: " connect to database.");
1633: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
1634: return undef;
1635: }
1636: my $table_check = &Apache::lonmysql::check_table($table);
1637: if (! defined($table_check)) {
1638: $r->print("A MySQL error has occurred.</form></body></html>");
1639: &Apache::lonnet::logthis("lonmysql was unable to determine the status".
1640: " of table ".$table);
1641: return undef;
1642: } elsif (! $table_check) {
1643: $r->print("The table of results could not be found.");
1644: &Apache::lonnet::logthis("The user requested a table, ".$table.
1645: ", that could not be found.");
1646: return undef;
1647: }
1648: return 1;
1649: }
1650:
1651: ######################################################################
1652: ######################################################################
1653:
1654: =pod
1655:
1656: =item &print_sort_form
1657:
1658: =cut
1659:
1660: ######################################################################
1661: ######################################################################
1662: sub print_sort_form {
1663: my ($r,$pretty_query_string) = @_;
1664: ##
1665: my %SortableFields =
1666: (id => 'Default',
1667: title => 'Title',
1668: author => 'Author',
1669: subject => 'Subject',
1670: url => 'URL',
1671: version => 'Version Number',
1672: mime => 'Mime type',
1673: lang => 'Language',
1674: owner => 'Owner/Publisher',
1675: copyright => 'Copyright',
1676: hostname => 'Host',
1677: creationdate => 'Creation Date',
1678: lastrevisiondate => 'Revision Date',
1679: );
1680: ##
1681: my $table = $ENV{'form.table'};
1682: return if (! &ensure_db_and_table($r,$table));
1683: ##
1684: ## Get the number of results
1685: ##
1686: my $total_results = &Apache::lonmysql::number_of_rows($table);
1687: if (! defined($total_results)) {
1688: $r->print("A MySQL error has occurred.</form></body></html>");
1689: &Apache::lonnet::logthis("lonmysql was unable to determine the number".
1690: " of rows in table ".$table);
1691: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
1692: return;
1693: }
1694: my $result;
1695: $result.=<<END;
1696: <html>
1697: <head>
1698: <script>
1699: function change_sort() {
1700: var newloc = "/adm/searchcat?phase=results";
1701: newloc += "&persistent_db_id=$ENV{'form.persistent_db_id'}";
1702: newloc += "&sortby=";
1703: newloc += document.forms.statusform.elements.sortby.value;
1704: parent.resultsframe.location= newloc;
1705: }
1706: </script>
1707: <title>Results</title>
1708: </head>
1709: $bodytag
1710: <form name="statusform" action="" method="post">
1711: <input type="hidden" name="Queue" value="" />
1712: END
1713:
1714: #<h2>Sort Results</h2>
1715: #Sort by: <select size="1" name="sortby" onchange="javascript:change_sort();">
1716: # $ENV{'form.sortby'} = 'id' if (! defined($ENV{'form.sortby'}));
1717: # foreach (keys(%SortableFields)) {
1718: # $result.="<option name=\"$_\"";
1719: # if ($_ eq $ENV{'form.sortby'}) {
1720: # $result.=" selected ";
1721: # }
1722: # $result.=" >$SortableFields{$_}</option>\n";
1723: # }
1724: # $result.="</select>\n";
1725: my $revise = &revise_button();
1726: $result.=<<END;
1727: <p>
1728: There are $total_results matches to your query. $revise
1729: </p><p>
1730: Search:$pretty_query_string
1731: </p>
1732: </form>
1733: </body>
1734: </html>
1735: END
1736: $r->print($result);
1737: return;
1738: }
1739:
1740: #####################################################################
1741: #####################################################################
1742:
1743: =pod
1744:
1745: =item MySQL Table Description
1746:
1747: MySQL table creation requires a precise description of the data to be
1748: stored. The use of the correct types to hold data is vital to efficient
1749: storage and quick retrieval of records. The columns must be described in
1750: the following format:
1751:
1752: =cut
1753:
1754: ##
1755: ## Restrictions:
1756: ## columns of type 'text' and 'blob' cannot have defaults.
1757: ## columns of type 'enum' cannot be used for FULLTEXT.
1758: ##
1759: my @DataOrder = qw/id title author subject url keywords version notes
1760: abstract mime lang owner copyright creationdate lastrevisiondate hostname/;
1761:
1762: my %Datatypes =
1763: ( id =>{ type => 'MEDIUMINT',
1764: restrictions => 'UNSIGNED NOT NULL',
1765: primary_key => 'yes',
1766: auto_inc => 'yes'
1767: },
1768: title =>{ type=>'TEXT'},
1769: author =>{ type=>'TEXT'},
1770: subject =>{ type=>'TEXT'},
1771: url =>{ type=>'TEXT',
1772: restrictions => 'NOT NULL' },
1773: keywords =>{ type=>'TEXT'},
1774: version =>{ type=>'TEXT'},
1775: notes =>{ type=>'TEXT'},
1776: abstract =>{ type=>'TEXT'},
1777: mime =>{ type=>'TEXT'},
1778: lang =>{ type=>'TEXT'},
1779: owner =>{ type=>'TEXT'},
1780: copyright =>{ type=>'TEXT'},
1781: hostname =>{ type=>'TEXT'},
1782: #--------------------------------------------------
1783: creationdate =>{ type=>'DATETIME'},
1784: lastrevisiondate =>{ type=>'DATETIME'},
1785: #--------------------------------------------------
1786: );
1787:
1788: my @Fullindicies =
1789: qw/title/;
1790: # qw/title author subject abstract mime language owner copyright/;
1791:
1792: ######################################################################
1793: ######################################################################
1794:
1795: =pod
1796:
1797: =item &create_results_table()
1798:
1799: Creates the table of search results by calling lonmysql. Stores the
1800: table id in $ENV{'form.table'}
1801:
1802: Inputs: none.
1803:
1804: Returns: the identifier of the table on success, undef on error.
1805:
1806: =cut
1807:
1808: ######################################################################
1809: ######################################################################
1810: sub create_results_table {
1811: my $table = &Apache::lonmysql::create_table
1812: ( { columns => \%Datatypes,
1813: column_order => \@DataOrder,
1814: fullindex => \@Fullindicies,
1815: } );
1816: if (defined($table)) {
1817: $ENV{'form.table'} = $table;
1818: return $table;
1819: }
1820: return undef; # Error...
1821: }
1822:
1823: ######################################################################
1824: ######################################################################
1825:
1826: =pod
1827:
1828: =item Search Status update functions
1829:
1830: Each of the following functions changes the values of one of the
1831: input fields used to display the search status to the user. The names
1832: should be explanatory.
1833:
1834: Inputs: Apache request handler ($r), text to display.
1835:
1836: Returns: Nothing.
1837:
1838: =over 4
1839:
1840: =item &update_count_status()
1841:
1842: =item &update_status()
1843:
1844: =item &update_seconds()
1845:
1846: =back
1847:
1848: =cut
1849:
1850: ######################################################################
1851: ######################################################################
1852: sub update_count_status {
1853: my ($r,$text) = @_;
1854: $text =~ s/\'/\\\'/g;
1855: $r->print
1856: ("<script>document.statusform.count.value = ' $text'</script>\n");
1857: $r->rflush();
1858: }
1859:
1860: sub update_status {
1861: my ($r,$text) = @_;
1862: $text =~ s/\'/\\\'/g;
1863: $r->print
1864: ("<script>document.statusform.status.value = ' $text'</script>\n");
1865: $r->rflush();
1866: }
1867:
1868: sub update_seconds {
1869: my ($r,$text) = @_;
1870: $text =~ s/\'/\\\'/g;
1871: $r->print
1872: ("<script>document.statusform.seconds.value = ' $text'</script>\n");
1873: $r->rflush();
1874: }
1875:
1876: ######################################################################
1877: ######################################################################
1878:
1879: =pod
1880:
1881: =item &revise_button
1882:
1883: Inputs: None
1884:
1885: Returns: html string for a 'revise search' button.
1886:
1887: =cut
1888:
1889: ######################################################################
1890: ######################################################################
1891: sub revise_button {
1892: my $revise_phase = 'disp_basic';
1893: $revise_phase = 'disp_adv' if ($ENV{'form.searchmode'} eq 'advanced');
1894: my $newloc = '/adm/searchcat'.
1895: '?persistent_db_id='.$ENV{'form.persistent_db_id'}.
1896: '&cleargroupsort=1'.
1897: '&phase='.$revise_phase;
1898: my $result = qq{<input type="button" value="Revise search" name="revise"} .
1899: qq{ onClick="parent.location='$newloc';" /> };
1900: return $result;
1901: }
1902:
1903: ######################################################################
1904: ######################################################################
1905:
1906: =pod
1907:
1908: =item &run_search
1909:
1910: =cut
1911:
1912: ######################################################################
1913: ######################################################################
1914: sub run_search {
1915: my ($r,$query,$customquery,$customshow,$serverlist,$pretty_string) = @_;
1916: my $connection = $r->connection;
1917: #
1918: # Timing variables
1919: #
1920: my $starttime = time;
1921: my $max_time = 30; # seconds for the search to complete
1922: #
1923: # Print run_search header
1924: #
1925: $r->print(<<END);
1926: <html>
1927: <head><title>Search Status</title></head>
1928: $bodytag
1929: <form name="statusform" action="" method="post">
1930: <input type="hidden" name="Queue" value="" />
1931: END
1932: # Check to see if $pretty_string has more than one carriage return.
1933: # Assume \n s are following <br /> s and truncate the value.
1934: # (there is probably a better way)...
1935: my @Lines = split /<br \/>/,$pretty_string;
1936: if (@Lines > 2) {
1937: $pretty_string = join '<br \>',(@Lines[0..2],'....<br />');
1938: }
1939: $r->print("Search: ".$pretty_string);
1940: $r->rflush();
1941: #
1942: # Determine the servers we need to contact.
1943: #
1944: my @Servers_to_contact;
1945: if (defined($serverlist)) {
1946: if (ref($serverlist) eq 'ARRAY') {
1947: @Servers_to_contact = @$serverlist;
1948: } else {
1949: @Servers_to_contact = ($serverlist);
1950: }
1951: } else {
1952: @Servers_to_contact = sort(keys(%Apache::lonnet::libserv));
1953: }
1954: my %Server_status;
1955: my $table =$ENV{'form.table'};
1956: if (! defined($table) || $table eq '' || $table =~ /\D/ ) {
1957: $r->print("Unable to determine table id to store search results in.".
1958: "The search has been aborted.</body></html>");
1959: return;
1960: }
1961: my $table_status = &Apache::lonmysql::check_table($table);
1962: if (! defined($table_status)) {
1963: $r->print("Unable to determine status of table.</body></html>");
1964: &Apache::lonnet::logthis("Bogus table id of $table for ".
1965: "$ENV{'user.name'} @ $ENV{'user.domain'}");
1966: &Apache::lonnet::logthis("lonmysql error = ".
1967: &Apache::lonmysql::get_error());
1968: return;
1969: }
1970: if (! $table_status) {
1971: $r->print("The table id,$table, we tried to use is invalid.".
1972: "The search has been aborted.</body></html>");
1973: return;
1974: }
1975: ##
1976: ## Prepare for the big loop.
1977: ##
1978: my $hitcountsum;
1979: my $server;
1980: my $status;
1981: my $revise = &revise_button();
1982: $r->print(<<END);
1983: <table>
1984: <tr><th>Status</th><th>Total Matches</th><th>Time Remaining</th><th></th></tr>
1985: <tr>
1986: <td><input type="text" name="status" value="" size="30" /></td>
1987: <td><input type="text" name="count" value="" size="10" /></td>
1988: <td><input type="text" name="seconds" value="" size="8" /></td>
1989: <td>$revise</td>
1990: </tr>
1991: </table>
1992: </form>
1993: END
1994: $r->rflush();
1995: my $time_remaining = $max_time - (time - $starttime) ;
1996: my $last_time = $time_remaining;
1997: &update_seconds($r,$time_remaining);
1998: while (($time_remaining > 0) &&
1999: ((@Servers_to_contact) || keys(%Server_status))) {
2000: # Send out a search request if it needs to be done.
2001: if (@Servers_to_contact) {
2002: # Contact one server
2003: my $server = shift(@Servers_to_contact);
2004: my $reply=&Apache::lonnet::metadata_query($query,$customquery,
2005: $customshow,[$server]);
2006: ($server) = keys(%$reply);
2007: $Server_status{$server} = $reply->{$server};
2008: &update_status($r,'contacting '.$server);
2009: } else {
2010: # wait a sec. to give time for files to be written
2011: # This sleep statement is here instead of outside the else
2012: # block because we do not want to pause if we have servers
2013: # left to contact.
2014: sleep(1);
2015: }
2016: #
2017: if (scalar (keys(%Server_status))) {
2018: &update_status($r,'waiting on '.(join(' ',keys(%Server_status))));
2019: }
2020: #
2021: # Loop through the servers we have contacted but do not
2022: # have results from yet, looking for results.
2023: while (my ($server,$status) = each(%Server_status)) {
2024: last if ($connection->aborted());
2025: if ($status eq 'con_lost') {
2026: delete ($Server_status{$server});
2027: next;
2028: }
2029: $status=~/^([\.\w]+)$/;
2030: my $datafile=$r->dir_config('lonDaemons').'/tmp/'.$1;
2031: if (-e $datafile && ! -e "$datafile.end") {
2032: &update_status($r,'Receiving results from '.$server);
2033: next;
2034: }
2035: last if ($connection->aborted());
2036: if (-e "$datafile.end") {
2037: &update_status($r,'Reading results from '.$server);
2038: if (-z "$datafile") {
2039: delete($Server_status{$server});
2040: next;
2041: }
2042: my $fh;
2043: if (!($fh=Apache::File->new($datafile))) {
2044: $r->print("Unable to open search results file for ".
2045: "server $server. Omitting from search");
2046: delete($Server_status{$server});
2047: next;
2048: }
2049: # Read in the whole file.
2050: while (my $result = <$fh>) {
2051: last if ($connection->aborted());
2052: # handle custom fields? Someday we will!
2053: chomp($result);
2054: next unless $result;
2055: # Parse the result.
2056: my %Fields = &parse_raw_result($result,$server);
2057: $Fields{'hostname'} = $server;
2058: next if (! ©right_check(\%Fields));
2059: # Store the result in the mysql database
2060: my $result = &Apache::lonmysql::store_row($table,\%Fields);
2061: if (! defined($result)) {
2062: $r->print(&Apache::lonmysql::get_error());
2063: }
2064: # $r->print(&Apache::lonmysql::get_debug());
2065: $hitcountsum ++;
2066: $time_remaining = $max_time - (time - $starttime) ;
2067: if ($last_time - $time_remaining > 0) {
2068: &update_seconds($r,$time_remaining);
2069: $last_time = $time_remaining;
2070: }
2071: if ($hitcountsum % 50 == 0) {
2072: &update_count_status($r,$hitcountsum);
2073: }
2074: } # End of foreach (@results)
2075: $fh->close();
2076: # $server is only deleted if the results file has been
2077: # found and (successfully) opened. This may be a bad idea.
2078: delete($Server_status{$server});
2079: }
2080: last if ($connection->aborted());
2081: &update_count_status($r,$hitcountsum);
2082: }
2083: last if ($connection->aborted());
2084: # Finished looping through the servers
2085: $starttime = time if (@Servers_to_contact);
2086: $time_remaining = $max_time - (time - $starttime) ;
2087: if ($last_time - $time_remaining > 0) {
2088: $last_time = $time_remaining;
2089: &update_seconds($r,$time_remaining);
2090: }
2091: }
2092: &update_status($r,'Search Complete'.$server);
2093: &update_seconds($r,0);
2094: &Apache::lonmysql::disconnect_from_db();
2095: # We have run out of time or run out of servers to talk to and
2096: # results to get.
2097: $r->print("</body></html>");
2098: if ($ENV{'form.catalogmode'} ne 'groupsearch') {
2099: $r->print("<script>".
2100: "window.location='/adm/searchcat?".
2101: "phase=sort&".
2102: "persistent_db_id=$ENV{'form.persistent_db_id'}';".
2103: "</script>");
2104: }
2105: return;
2106: }
2107:
2108: ######################################################################
2109: ######################################################################
2110: =pod
2111:
2112: =item &prev_next_buttons
2113:
2114: =cut
2115:
2116: ######################################################################
2117: ######################################################################
2118: sub prev_next_buttons {
2119: my ($current_min,$show,$total,$parms) = @_;
2120: return '' if ($show eq 'all'); # No links if you get them all at once.
2121: my $links;
2122: ##
2123: ## Prev
2124: my $prev_min = $current_min - $show;
2125: $prev_min = 1 if $prev_min < 1;
2126: if ($prev_min < $current_min) {
2127: $links .= qq{
2128: <a href="/adm/searchcat?$parms&start=$prev_min&show=$show">prev</a>
2129: };
2130: } else {
2131: $links .= 'prev';
2132: }
2133: ##
2134: ## Pages.... Someday.
2135: ##
2136: $links .= qq{
2137: <a href="/adm/searchcat?$parms&start=$current_min&$show=$show">reload</a>
2138: };
2139: ##
2140: ## Next
2141: my $next_min = $current_min + $show;
2142: $next_min = $current_min if ($next_min > $total);
2143: if ($next_min != $current_min) {
2144: $links .= qq{
2145: <a href="/adm/searchcat?$parms&start=$next_min&show=$show">next</a>
2146: };
2147: } else {
2148: $links .= ' next';
2149: }
2150: return $links;
2151: }
2152: ######################################################################
2153: ######################################################################
2154:
2155: =pod
2156:
2157: =item &display_results
2158:
2159: =cut
2160:
2161: ######################################################################
2162: ######################################################################
2163: sub display_results {
2164: my ($r,$importbutton,$closebutton) = @_;
2165: my $connection = $r->connection;
2166: $r->print(&search_results_header($importbutton,$closebutton));
2167: ##
2168: ## Set viewing function
2169: ##
2170: my $viewfunction = $Views{$ENV{'form.viewselect'}};
2171: if (!defined($viewfunction)) {
2172: $r->print("Internal Error - Bad view selected.\n");
2173: $r->rflush();
2174: return;
2175: }
2176: ##
2177: ## $checkbox_num is a count of the number of checkboxes output on the
2178: ## page this is used only during catalogmode=groupsearch.
2179: my $checkbox_num = 0;
2180: ##
2181: ## Get the catalog controls setup
2182: ##
2183: my $action = "/adm/searchcat?phase=results";
2184: ##
2185: ## Deal with groupsearch
2186: ##
2187: if ($ENV{'form.catalogmode'} eq 'groupsearch') {
2188: if (! tie(%groupsearch_db,'GDBM_File',$diropendb,
2189: &GDBM_WRCREAT(),0640)) {
2190: $r->print('Unable to store import results.</form></body></html>');
2191: $r->rflush();
2192: return;
2193: }
2194: }
2195: ##
2196: ## Prepare the table for querying
2197: ##
2198: my $table = $ENV{'form.table'};
2199: return if (! &ensure_db_and_table($r,$table));
2200: ##
2201: ## Get the number of results
2202: ##
2203: my $total_results = &Apache::lonmysql::number_of_rows($table);
2204: if (! defined($total_results)) {
2205: $r->print("A MySQL error has occurred.</form></body></html>");
2206: &Apache::lonnet::logthis("lonmysql was unable to determine the number".
2207: " of rows in table ".$table);
2208: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
2209: return;
2210: }
2211: ##
2212: ## Determine how many results we need to get
2213: ##
2214: $ENV{'form.start'} = 1 if (! exists($ENV{'form.start'}));
2215: $ENV{'form.show'} = 'all' if (! exists($ENV{'form.show'}));
2216: my $min = $ENV{'form.start'};
2217: my $max;
2218: if ($ENV{'form.show'} eq 'all') {
2219: $max = $total_results ;
2220: } else {
2221: $max = $min + $ENV{'form.show'} - 1;
2222: $max = $total_results if ($max > $total_results);
2223: }
2224: ##
2225: ## Output links (if necessary) for 'prev' and 'next' pages.
2226: ##
2227: $r->print
2228: ('<center>'.
2229: &prev_next_buttons($min,$ENV{'form.show'},$total_results,
2230: "table=".$ENV{'form.table'}.
2231: "&phase=results".
2232: "&persistent_db_id=".$ENV{'form.persistent_db_id'})
2233: ."</center>\n"
2234: );
2235: if ($total_results == 0) {
2236: $r->print("There are currently no results.\n".
2237: "</form></body></html>");
2238: return;
2239: } else {
2240: $r->print
2241: ("<center>Results $min to $max out of $total_results</center>\n");
2242: }
2243: ##
2244: ## Get results from MySQL table
2245: ##
2246: my @Results = &Apache::lonmysql::get_rows($table,
2247: 'id>='.$min.' AND id<='.$max);
2248: ##
2249: ## Loop through the results and output them.
2250: ##
2251: foreach my $row (@Results) {
2252: if ($connection->aborted()) {
2253: &cleanup();
2254: return;
2255: }
2256: my %Fields = %{&parse_row(@$row)};
2257: my $output="<p>\n";
2258: my $prefix=&catalogmode_output($Fields{'title'},$Fields{'url'},
2259: $Fields{'id'},$checkbox_num++);
2260: # Render the result into html
2261: $output.= &$viewfunction($prefix,%Fields);
2262: # Print them out as they come in.
2263: $r->print($output);
2264: $r->rflush();
2265: }
2266: if (@Results < 1) {
2267: $r->print("There were no results matching your query");
2268: } else {
2269: $r->print
2270: ('<center>'.
2271: &prev_next_buttons($min,$ENV{'form.show'},$total_results,
2272: "table=".$ENV{'form.table'}.
2273: "&phase=results".
2274: "&persistent_db_id=".
2275: $ENV{'form.persistent_db_id'})
2276: ."</center>\n"
2277: );
2278: }
2279: $r->print("</form></body></html>");
2280: $r->rflush();
2281: untie %groupsearch_db if (tied(%groupsearch_db));
2282: return;
2283: }
2284:
2285: ######################################################################
2286: ######################################################################
2287:
2288: =pod
2289:
2290: =item &catalogmode_output($title,$url,$fnum,$checkbox_num)
2291:
2292: Returns html needed for the various catalog modes. Gets inputs from
2293: $ENV{'form.catalogmode'}. Stores data in %groupsearch_db.
2294:
2295: =cut
2296:
2297: ######################################################################
2298: ######################################################################
2299: sub catalogmode_output {
2300: my $output = '';
2301: my ($title,$url,$fnum,$checkbox_num) = @_;
2302: if ($ENV{'form.catalogmode'} eq 'interactive') {
2303: $title=~ s/\'/\\\'/g;
2304: if ($ENV{'form.catalogmode'} eq 'interactive') {
2305: $output.=<<END
2306: <font size='-1'><INPUT TYPE="button" NAME="returnvalues" VALUE="SELECT"
2307: onClick="javascript:select_data('$title','$url')">
2308: </font>
2309: END
2310: }
2311: } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') {
2312: $groupsearch_db{"pre_${fnum}_link"}=$url;
2313: $groupsearch_db{"pre_${fnum}_title"}=$title;
2314: $output.=<<END;
2315: <font size='-1'>
2316: <input type="checkbox" name="returnvalues" value="SELECT"
2317: onClick="javascript:queue($checkbox_num,$fnum)" />
2318: </font>
2319: END
2320: }
2321: return $output;
2322: }
2323: ######################################################################
2324: ######################################################################
2325:
2326: =pod
2327:
2328: =item &parse_row
2329:
2330: Parse a row returned from the database.
2331:
2332: =cut
2333:
2334: ######################################################################
2335: ######################################################################
2336: sub parse_row {
2337: my @Row = @_;
2338: my %Fields;
2339: for (my $i=0;$i<=$#Row;$i++) {
2340: $Fields{$DataOrder[$i]}=&Apache::lonnet::unescape($Row[$i]);
2341: }
2342: $Fields{'language'} =
2343: &Apache::loncommon::languagedescription($Fields{'lang'});
2344: $Fields{'copyrighttag'} =
2345: &Apache::loncommon::copyrightdescription($Fields{'copyright'});
2346: $Fields{'mimetag'} =
2347: &Apache::loncommon::filedescription($Fields{'mime'});
2348: return \%Fields;
2349: }
2350:
2351: ###########################################################
2352: ###########################################################
2353:
2354: =pod
2355:
2356: =item &parse_raw_result()
2357:
2358: Takes a line from the file of results and parse it. Returns a hash
2359: with keys for the following fields:
2360: 'title', 'author', 'subject', 'url', 'keywords', 'version', 'notes',
2361: 'abstract', 'mime', 'lang', 'owner', 'copyright', 'creationdate',
2362: 'lastrevisiondate'.
2363:
2364: In addition, the following tags are set by calling the appropriate
2365: lonnet function: 'language', 'cprtag', 'mimetag'.
2366:
2367: The 'title' field is set to "Untitled" if the title field is blank.
2368:
2369: 'abstract' and 'keywords' are truncated to 200 characters.
2370:
2371: =cut
2372:
2373: ###########################################################
2374: ###########################################################
2375: sub parse_raw_result {
2376: my ($result,$hostname) = @_;
2377: # Check for a comma - if it is there then we do not need to unescape the
2378: # string. There seems to be some kind of problem with some items in
2379: # the database - the entire string gets sent out unescaped...?
2380: unless ($result =~ /,/) {
2381: $result = &Apache::lonnet::unescape($result);
2382: }
2383: my @fields=map {
2384: &Apache::lonnet::unescape($_);
2385: } (split(/\,/,$result));
2386: my ($title,$author,$subject,$url,$keywords,$version,
2387: $notes,$abstract,$mime,$lang,
2388: $creationdate,$lastrevisiondate,$owner,$copyright)=@fields;
2389: my %Fields =
2390: ( title => &Apache::lonnet::unescape($title),
2391: author => &Apache::lonnet::unescape($author),
2392: subject => &Apache::lonnet::unescape($subject),
2393: url => &Apache::lonnet::unescape($url),
2394: keywords => &Apache::lonnet::unescape($keywords),
2395: version => &Apache::lonnet::unescape($version),
2396: notes => &Apache::lonnet::unescape($notes),
2397: abstract => &Apache::lonnet::unescape($abstract),
2398: mime => &Apache::lonnet::unescape($mime),
2399: lang => &Apache::lonnet::unescape($lang),
2400: owner => &Apache::lonnet::unescape($owner),
2401: copyright => &Apache::lonnet::unescape($copyright),
2402: creationdate => &Apache::lonnet::unescape($creationdate),
2403: lastrevisiondate => &Apache::lonnet::unescape($lastrevisiondate)
2404: );
2405: $Fields{'language'} =
2406: &Apache::loncommon::languagedescription($Fields{'lang'});
2407: $Fields{'copyrighttag'} =
2408: &Apache::loncommon::copyrightdescription($Fields{'copyright'});
2409: $Fields{'mimetag'} =
2410: &Apache::loncommon::filedescription($Fields{'mime'});
2411: if ($Fields{'author'}=~/^(\s*|error)$/) {
2412: $Fields{'author'}="Unknown Author";
2413: }
2414: # Put spaces in the keyword list, if needed.
2415: $Fields{'keywords'}=~ s/,([A-z])/, $1/g;
2416: if ($Fields{'title'}=~ /^\s*$/ ) {
2417: $Fields{'title'}='Untitled';
2418: }
2419: unless ($ENV{'user.adv'}) {
2420: # What is this anyway?
2421: $Fields{'keywords'} = '- not displayed -';
2422: $Fields{'notes'} = '- not displayed -';
2423: $Fields{'abstract'} = '- not displayed -';
2424: $Fields{'subject'} = '- not displayed -';
2425: }
2426: if (length($Fields{'abstract'})>200) {
2427: $Fields{'abstract'} =
2428: substr($Fields{'abstract'},0,200).'...';
2429: }
2430: if (length($Fields{'keywords'})>200) {
2431: $Fields{'keywords'} =
2432: substr($Fields{'keywords'},0,200).'...';
2433: }
2434: return %Fields;
2435: }
2436:
2437: ###########################################################
2438: ###########################################################
2439:
2440: =pod
2441:
2442: =item &handle_custom_fields()
2443:
2444: =cut
2445:
2446: ###########################################################
2447: ###########################################################
2448: sub handle_custom_fields {
2449: my @results = @{shift()};
2450: my $customshow='';
2451: my $extrashow='';
2452: my @customfields;
2453: if ($ENV{'form.customshow'}) {
2454: $customshow=$ENV{'form.customshow'};
2455: $customshow=~s/[^\w\s]//g;
2456: my @fields=map {
2457: "<font color=\"#008000\">$_:</font><!-- $_ -->";
2458: } split(/\s+/,$customshow);
2459: @customfields=split(/\s+/,$customshow);
2460: if ($customshow) {
2461: $extrashow="<ul><li>".join("</li><li>",@fields)."</li></ul>\n";
2462: }
2463: }
2464: my $customdata='';
2465: my %customhash;
2466: foreach my $result (@results) {
2467: if ($result=~/^(custom\=.*)$/) { # grab all custom metadata
2468: my $tmp=$result;
2469: $tmp=~s/^custom\=//;
2470: my ($k,$v)=map {&Apache::lonnet::unescape($_);
2471: } split(/\,/,$tmp);
2472: $customhash{$k}=$v;
2473: }
2474: }
2475: return ($extrashow,\@customfields,\%customhash);
2476: }
2477:
2478: ######################################################################
2479: ######################################################################
2480:
2481: =pod
2482:
2483: =item &search_results_header
2484:
2485: Output the proper html headers and javascript code to deal with different
2486: calling modes.
2487:
2488: Takes most inputs directly from %ENV, except $mode.
2489:
2490: =over 4
2491:
2492: =item $mode is either (at this writing) 'Basic' or 'Advanced'
2493:
2494: =back
2495:
2496: The following environment variables are checked:
2497:
2498: =over 4
2499:
2500: =item 'form.catalogmode'
2501:
2502: Checked for 'interactive' and 'groupsearch'.
2503:
2504: =item 'form.mode'
2505:
2506: Checked for existance & 'edit' mode.
2507:
2508: =item 'form.form'
2509:
2510: =item 'form.element'
2511:
2512: =back
2513:
2514: =cut
2515:
2516: ######################################################################
2517: ######################################################################
2518: sub search_results_header {
2519: my ($importbutton,$closebutton) = @_;
2520: my $result = '';
2521: # output beginning of search page
2522: # conditional output of script functions dependent on the mode in
2523: # which the search was invoked
2524: if ($ENV{'form.catalogmode'} eq 'interactive'){
2525: if (! exists($ENV{'form.mode'}) || $ENV{'form.mode'} ne 'edit') {
2526: $result.=<<SCRIPT;
2527: <script type="text/javascript">
2528: function select_data(title,url) {
2529: changeTitle(title);
2530: changeURL(url);
2531: parent.close();
2532: }
2533: function changeTitle(val) {
2534: if (parent.opener.inf.document.forms.resinfo.elements.t) {
2535: parent.opener.inf.document.forms.resinfo.elements.t.value=val;
2536: }
2537: }
2538: function changeURL(val) {
2539: if (parent.opener.inf.document.forms.resinfo.elements.u) {
2540: parent.opener.inf.document.forms.resinfo.elements.u.value=val;
2541: }
2542: }
2543: </script>
2544: SCRIPT
2545: } elsif ($ENV{'form.mode'} eq 'edit') {
2546: my $form = $ENV{'form.form'};
2547: my $element = $ENV{'form.element'};
2548: $result.=<<SCRIPT;
2549: <script type="text/javascript">
2550: function select_data(title,url) {
2551: changeURL(url);
2552: parent.close();
2553: }
2554: function changeTitle(val) {
2555: }
2556: function changeURL(val) {
2557: if (parent.targetwin.document) {
2558: parent.targetwin.document.forms["$form"].elements["$element"].value=val;
2559: } else {
2560: var url = 'forms[\"$form\"].elements[\"$element\"].value';
2561: alert("Unable to transfer data to "+url);
2562: }
2563: }
2564: </script>
2565: SCRIPT
2566: }
2567: }
2568: $result.=<<SCRIPT if $ENV{'form.catalogmode'} eq 'groupsearch';
2569: <script type="text/javascript">
2570: function queue(checkbox_num,val) {
2571: if (document.forms.results.returnvalues[checkbox_num].checked) {
2572: parent.statusframe.document.forms.statusform.elements.Queue.value +='1a'+val+'b';
2573: } else {
2574: parent.statusframe.document.forms.statusform.elements.Queue.value +='0a'+val+'b';
2575: }
2576: }
2577: function select_group() {
2578: parent.window.location=
2579: "/adm/groupsort?mode=$ENV{'form.mode'}&catalogmode=groupsearch&acts="+
2580: parent.statusframe.document.forms.statusform.elements.Queue.value;
2581: }
2582: </script>
2583: SCRIPT
2584: $result.=<<END;
2585: </head>
2586: $bodytag
2587: <form name="results" method="post" action="" >
2588: <input type="hidden" name="Queue" value="" />
2589: $importbutton
2590: END
2591: return $result;
2592: }
2593:
2594: ######################################################################
2595: ######################################################################
2596: sub search_status_header {
2597: return <<ENDSTATUS;
2598: <html><head><title>Search Status</title></head>
2599: $bodytag
2600: <h3>Search Status</h3>
2601: Sending search request to LON-CAPA servers.<br />
2602: ENDSTATUS
2603: }
2604:
2605: sub results_link {
2606: my $basic_link = "/adm/searchcat?"."&table=".$ENV{'form.table'}.
2607: "&persistent_db_id=".$ENV{'form.persistent_db_id'};
2608: my $results_link = $basic_link."&phase=results".
2609: "&pause=1"."&start=1";
2610: return $results_link;
2611: }
2612:
2613: ######################################################################
2614: ######################################################################
2615: sub print_frames_interface {
2616: my $r = shift;
2617: my $basic_link = "/adm/searchcat?"."&table=".$ENV{'form.table'}.
2618: "&persistent_db_id=".$ENV{'form.persistent_db_id'};
2619: my $run_search_link = $basic_link."&phase=run_search";
2620: my $results_link = &results_link();
2621: my $result = <<"ENDFRAMES";
2622: <html>
2623: <head>
2624: <script>
2625: var targetwin = opener;
2626: var queue = '';
2627: </script>
2628: <title>LON-CAPA Digital Library Search Results</title>
2629: </head>
2630: <frameset rows="150,*">
2631: <frame name="statusframe" src="$run_search_link">
2632: <frame name="resultsframe" src="$results_link">
2633: </frameset>
2634: </html>
2635: ENDFRAMES
2636:
2637: $r->print($result);
2638: return;
2639: }
2640:
2641: ######################################################################
2642: ######################################################################
2643:
2644: =pod
2645:
2646: =item Metadata Viewing Functions
2647:
2648: Output is a HTML-ified string.
2649: Input arguments are title, author, subject, url, keywords, version,
2650: notes, short abstract, mime, language, creation date,
2651: last revision date, owner, copyright, hostname, and
2652: extra custom metadata to show.
2653:
2654: =over 4
2655:
2656: =item &detailed_citation_view()
2657:
2658: =cut
2659:
2660: ######################################################################
2661: ######################################################################
2662: sub detailed_citation_view {
2663: my ($prefix,%values) = @_;
2664: my $result=<<END;
2665: <b>$prefix<a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2666: target='search_preview'>$values{'title'}</a></b>
2667: <p>
2668: <b>$values{'author'}</b>, <i>$values{'owner'}</i><br />
2669:
2670: <b>Subject: </b> $values{'subject'}<br />
2671: <b>Keyword(s): </b> $values{'keywords'}<br />
2672: <b>Notes: </b> $values{'notes'}<br />
2673: <b>MIME Type: </b> $values{'mimetag'}<br />
2674: <b>Language: </b> $values{'language'}<br />
2675: <b>Copyright/Distribution:</b> $values{'cprtag'}<br />
2676: </p>
2677: $values{'extrashow'}
2678: <p>
2679: $values{'shortabstract'}
2680: </p>
2681: <hr align='left' width='200' noshade />
2682: END
2683: return $result;
2684: }
2685:
2686: ######################################################################
2687: ######################################################################
2688:
2689: =pod
2690:
2691: =item &summary_view()
2692:
2693: =cut
2694: ######################################################################
2695: ######################################################################
2696: sub summary_view {
2697: my ($prefix,%values) = @_;
2698: my $result=<<END;
2699: $prefix<a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2700: target='search_preview'>$values{'author'}</a><br />
2701: $values{'title'}<br />
2702: $values{'owner'} -- $values{'lastrevisiondate'}<br />
2703: $values{'copyrighttag'}<br />
2704: $values{'extrashow'}
2705: </p>
2706: <hr align='left' width='200' noshade />
2707: END
2708: return $result;
2709: }
2710:
2711: ######################################################################
2712: ######################################################################
2713:
2714: =pod
2715:
2716: =item &compact_view()
2717:
2718: =cut
2719:
2720: ######################################################################
2721: ######################################################################
2722: sub compact_view {
2723: my ($prefix,%values) = @_;
2724: my $result=<<END;
2725: $prefix <a href="http://$ENV{'HTTP_HOST'}$values{'url'}" target='search_preview'>
2726: $values{'title'}</a>
2727: <b>$values{'author'}</b><br />
2728: END
2729: return $result;
2730: }
2731:
2732:
2733: ######################################################################
2734: ######################################################################
2735:
2736: =pod
2737:
2738: =item &fielded_format_view()
2739:
2740: =cut
2741:
2742: ######################################################################
2743: ######################################################################
2744: sub fielded_format_view {
2745: my ($prefix,%values) = @_;
2746: my $result=<<END;
2747: $prefix
2748: <b>URL: </b> <a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2749: target='search_preview'>$values{'url'}</a>
2750: <br />
2751: <b>Title:</b> $values{'title'}<br />
2752: <b>Author(s):</b> $values{'author'}<br />
2753: <b>Subject:</b> $values{'subject'}<br />
2754: <b>Keyword(s):</b> $values{'keywords'}<br />
2755: <b>Notes:</b> $values{'notes'}<br />
2756: <b>MIME Type:</b> $values{'mimetag'}<br />
2757: <b>Language:</b> $values{'language'}<br />
2758: <b>Creation Date:</b> $values{'creationdate'}<br />
2759: <b>Last Revision Date:</b> $values{'lastrevisiondate'}<br />
2760: <b>Publisher/Owner:</b> $values{'owner'}<br />
2761: <b>Copyright/Distribution:</b> $values{'copyrighttag'}<br />
2762: <b>Repository Location:</b> $values{'hostname'}<br />
2763: <b>Abstract:</b> $values{'shortabstract'}<br />
2764: $values{'extrashow'}
2765: </p>
2766: <hr align='left' width='200' noshade />
2767: END
2768: return $result;
2769: }
2770:
2771: ######################################################################
2772: ######################################################################
2773:
2774: =pod
2775:
2776: =item &xml_sgml_view()
2777:
2778: =back
2779:
2780: =cut
2781:
2782: ######################################################################
2783: ######################################################################
2784: sub xml_sgml_view {
2785: my ($prefix,%values) = @_;
2786: my $result=<<END;
2787: $prefix
2788: <pre>
2789: <LonCapaResource>
2790: <url>$values{'url'}</url>
2791: <title>$values{'title'}</title>
2792: <author>$values{'author'}</author>
2793: <subject>$values{'subject'}</subject>
2794: <keywords>$values{'keywords'}</keywords>
2795: <notes>$values{'notes'}</notes>
2796: <mimeInfo>
2797: <mime>$values{'mime'}</mime>
2798: <mimetag>$values{'mimetag'}</mimetag>
2799: </mimeInfo>
2800: <languageInfo>
2801: <language>$values{'lang'}</language>
2802: <languagetag>$values{'language'}</languagetag>
2803: </languageInfo>
2804: <creationdate>$values{'creationdate'}</creationdate>
2805: <lastrevisiondate>$values{'lastrevisiondate'}</lastrevisiondate>
2806: <owner>$values{'owner'}</owner>
2807: <copyrightInfo>
2808: <copyright>$values{'copyright'}</copyright>
2809: <copyrighttag>$values{'copyrighttag'}</copyrighttag>
2810: </copyrightInfo>
2811: <repositoryLocation>$values{'hostname'}</repositoryLocation>
2812: <shortabstract>$values{'shortabstract'}</shortabstract>
2813: </LonCapaResource>
2814: </pre>
2815: $values{'extrashow'}
2816: <hr align='left' width='200' noshade />
2817: END
2818: return $result;
2819: }
2820:
2821: ######################################################################
2822: ######################################################################
2823:
2824: =pod
2825:
2826: =item &filled() see if field is filled.
2827:
2828: =cut
2829:
2830: ######################################################################
2831: ######################################################################
2832: sub filled {
2833: my ($field)=@_;
2834: if ($field=~/\S/ && $field ne 'any') {
2835: return 1;
2836: }
2837: else {
2838: return 0;
2839: }
2840: }
2841:
2842: ######################################################################
2843: ######################################################################
2844:
2845: =pod
2846:
2847: =item &output_blank_field_error()
2848:
2849: Output a complete page that indicates the user has not filled in enough
2850: information to do a search.
2851:
2852: Inputs: $r (Apache request handle), $closebutton, $parms.
2853:
2854: Returns: nothing
2855:
2856: $parms is extra information to include in the 'Revise search request' link.
2857:
2858: =cut
2859:
2860: ######################################################################
2861: ######################################################################
2862: sub output_blank_field_error {
2863: my ($r,$closebutton,$parms)=@_;
2864: # make query information persistent to allow for subsequent revision
2865: $r->print(<<BEGINNING);
2866: <html>
2867: <head>
2868: <title>The LearningOnline Network with CAPA</title>
2869: BEGINNING
2870: $r->print(<<RESULTS);
2871: </head>
2872: $bodytag
2873: <img align='right' src='/adm/lonIcons/lonlogos.gif' />
2874: <h1>Search Catalog</h1>
2875: <form method="post" action="/adm/searchcat">
2876: $hidden_fields
2877: <a href="/adm/searchcat?$parms&persistent_db_id=$ENV{'form.persistent_db_id'}"
2878: >Revise search request</a>
2879: $closebutton
2880: <hr />
2881: <h3>Unactionable search query.</h3>
2882: <p>
2883: You did not fill in enough information for the search to be started.
2884: You need to fill in relevant fields on the search page in order
2885: for a query to be processed.
2886: </p>
2887: </body>
2888: </html>
2889: RESULTS
2890: }
2891:
2892: ######################################################################
2893: ######################################################################
2894:
2895: =pod
2896:
2897: =item &output_date_error()
2898:
2899: Output a full html page with an error message.
2900:
2901: Inputs:
2902:
2903: $r, the request pointer.
2904: $message, the error message for the user.
2905: $closebutton, the specialized close button needed for groupsearch.
2906:
2907: =cut
2908:
2909: ######################################################################
2910: ######################################################################
2911: sub output_date_error {
2912: my ($r,$message,$closebutton)=@_;
2913: # make query information persistent to allow for subsequent revision
2914: $r->print(<<RESULTS);
2915: <html>
2916: <head>
2917: <title>The LearningOnline Network with CAPA</title>
2918: </head>
2919: $bodytag
2920: <img align='right' src='/adm/lonIcons/lonlogos.gif' />
2921: <h1>Search Catalog</h1>
2922: <form method="post" action="/adm/searchcat">
2923: $hidden_fields
2924: <input type='button' value='Revise search request'
2925: onClick='this.form.submit();' />
2926: $closebutton
2927: <hr />
2928: <h3>Error</h3>
2929: <p>
2930: $message
2931: </p>
2932: </body>
2933: </html>
2934: RESULTS
2935: }
2936:
2937: ######################################################################
2938: ######################################################################
2939:
2940: =pod
2941:
2942: =item &start_fresh_session()
2943:
2944: Cleans the global %groupsearch_db by removing all fields which begin with
2945: 'pre_' or 'store'.
2946:
2947: =cut
2948:
2949: ######################################################################
2950: ######################################################################
2951: sub start_fresh_session {
2952: delete $groupsearch_db{'mode_catalog'};
2953: foreach (keys %groupsearch_db) {
2954: if ($_ =~ /^pre_/) {
2955: delete $groupsearch_db{$_};
2956: }
2957: if ($_ =~ /^store/) {
2958: delete $groupsearch_db{$_};
2959: }
2960: }
2961: }
2962:
2963: 1;
2964:
2965: sub cleanup {
2966: if (tied(%groupsearch_db)) {
2967: &Apache::lonnet::logthis('Cleanup searchcat: groupsearch_db');
2968: unless (untie(%groupsearch_db)) {
2969: &Apache::lonnet::logthis('Failed cleanup searchcat: groupsearch_db');
2970: }
2971: }
2972: &Apache::lonmysql::disconnect_from_db();
2973: }
2974:
2975: __END__
2976:
2977: =pod
2978:
2979: =back
2980:
2981: =cut
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