1: # The LearningOnline Network with CAPA
2: # Search Catalog
3: #
4: # $Id: lonsearchcat.pm,v 1.159 2002/10/29 19:53:45 matthew Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###############################################################################
29: ###############################################################################
30:
31: =pod
32:
33: =head1 NAME
34:
35: lonsearchcat - LONCAPA Search Interface
36:
37: =head1 SYNOPSIS
38:
39: Search interface to LON-CAPAs digital library
40:
41: =head1 DESCRIPTION
42:
43: This module enables searching for a distributed browseable catalog.
44:
45: This is part of the LearningOnline Network with CAPA project
46: described at http://www.lon-capa.org.
47:
48: lonsearchcat presents the user with an interface to search the LON-CAPA
49: digital library. lonsearchcat also initiates the execution of a search
50: by sending the search parameters to LON-CAPA servers. The progress of
51: search (on a server basis) is displayed to the user in a seperate window.
52:
53: =head1 Internals
54:
55: =over 4
56:
57: =cut
58:
59: ###############################################################################
60: ###############################################################################
61:
62: ###############################################################################
63: ## ##
64: ## ORGANIZATION OF THIS PERL MODULE ##
65: ## ##
66: ## 1. Modules used by this module ##
67: ## 2. Variables used throughout the module ##
68: ## 3. handler subroutine called via Apache and mod_perl ##
69: ## 4. Other subroutines ##
70: ## ##
71: ###############################################################################
72:
73: package Apache::lonsearchcat;
74:
75: # ------------------------------------------------- modules used by this module
76: use strict;
77: use Apache::Constants qw(:common);
78: use Apache::lonnet();
79: use Apache::File();
80: use CGI qw(:standard);
81: use Text::Query;
82: use DBI;
83: use GDBM_File;
84: use Apache::loncommon();
85: use Apache::lonmysql();
86:
87: # ---------------------------------------- variables used throughout the module
88:
89: ######################################################################
90: ######################################################################
91:
92: =pod
93:
94: =item Global variables
95:
96: =over 4
97:
98: =item $importbutton
99:
100: button to take the select results and go to group sorting
101:
102: =item %groupsearch_db
103:
104: Database hash used to save values for the groupsearch RAT interface.
105:
106: =item $diropendb
107:
108: The full path to the (temporary) search database file. This is set and
109: used in &handler() and is also used in &output_results().
110:
111: =item %Views
112:
113: Hash which associates an output view description with the function
114: that produces it. Adding a new view type should be as easy as
115: adding a line to the definition of this hash and making sure the function
116: takes the proper parameters.
117:
118: =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: $scrout.=<<END;
442: </td><td><a href="/adm/searchcat?phase=disp_adv">Advanced Search</a></td></tr>
443: <tr><td>$checkbox use related words</td><td></td></tr>
444: </table>
445: </p>
446: <p>
447: <input type="submit" name="basicsubmit" value='SEARCH' />
448: $closebutton
449: END
450: $scrout.=&selectbox(undef,'viewselect',
451: $ENV{'form.viewselect'},
452: undef,undef,undef,
453: sort(keys(%Views)));
454: $scrout.=&selectbox(undef,'show',
455: $ENV{'form.show'},
456: undef,undef,undef,
457: (10,20,50,100));
458: $scrout.=<<ENDDOCUMENT;
459: per page.
460: </p>
461: </form>
462: </body>
463: </html>
464: ENDDOCUMENT
465: $r->print($scrout);
466: return;
467: }
468: ######################################################################
469: ######################################################################
470:
471: =pod
472:
473: =item &advanced_search_form()
474:
475: Returns a scalar which holds html for the advanced search form.
476:
477: =cut
478:
479: ######################################################################
480: ######################################################################
481:
482: sub print_advanced_search_form{
483: my ($r,$closebutton) = @_;
484: my $advanced_buttons = <<"END";
485: <p>
486: <input type="submit" name="advancedsubmit" value='SEARCH' />
487: <input type="reset" name="reset" value='RESET' />
488: $closebutton
489: <input type="button" value="HELP" onClick="openhelp()" />
490: </p>
491: END
492: if (!defined($ENV{'form.viewselect'})) {
493: $ENV{'form.viewselect'} ="Detailed Citation View";
494: }
495: my $bodytag=&Apache::loncommon::bodytag('Advanced Catalog Search');
496: my $scrout=<<"ENDHEADER";
497: <html>
498: <head>
499: <title>The LearningOnline Network with CAPA</title>
500: <script type="text/javascript">
501: function openhelp(val) {
502: openhelpwin=open('/adm/help/searchcat.html','helpscreen',
503: 'scrollbars=1,width=600,height=300');
504: openhelpwin.focus();
505: }
506: </script>
507: </head>
508: $bodytag
509: Enter terms or phrases separated by search operators
510: such as AND, OR, or NOT.<br />
511: <form method="post" action="/adm/searchcat">
512: $advanced_buttons
513: $hidden_fields
514: <input type="hidden" name="phase" value="adv_search" />
515: <table>
516: <tr><td><font color="#800000" face="helvetica"><b>VIEW:</b></font></td>
517: <td>
518: ENDHEADER
519: $scrout.=&selectbox(undef,'viewselect',
520: $ENV{'form.viewselect'},
521: undef,undef,undef,
522: sort(keys(%Views)));
523: $scrout.=' ';
524: $scrout.=&selectbox(undef,'show',
525: $ENV{'form.show'},
526: undef,undef,undef,
527: (10,20,50,100));
528: $scrout.=' '.
529: '<font color="#800000" face="helvetica">Per Page</font>';
530: $scrout.="</td><td>Related<br />Words</td></tr>\n";
531: $scrout.=&searchphrasefield_with_related('title', 'title' ,
532: $ENV{'form.title'});
533: $scrout.=&searchphrasefield('author', 'author' ,$ENV{'form.author'});
534: $scrout.=&searchphrasefield_with_related('subject', 'subject' ,
535: $ENV{'form.subject'});
536: $scrout.=&searchphrasefield_with_related('keywords','keywords',
537: $ENV{'form.keywords'});
538: $scrout.=&searchphrasefield('URL', 'url' ,$ENV{'form.url'});
539: $scrout.=&searchphrasefield_with_related('notes', 'notes' ,
540: $ENV{'form.notes'});
541: $scrout.=&searchphrasefield_with_related('abstract','abstract',
542: $ENV{'form.abstract'});
543: # Hack - an empty table row.
544: $scrout.="<tr><td> </td><td> </td><td> </td></tr>\n";
545: $scrout.=&searchphrasefield('file<br />extension','mime',
546: $ENV{'form.mime'});
547: $scrout.="<tr><td> </td><td> </td><td> </td></tr>\n";
548: $scrout.=&searchphrasefield('publisher<br />owner','owner',
549: $ENV{'form.owner'});
550: $scrout.="</table>\n";
551: $ENV{'form.category'}='any' unless length($ENV{'form.category'});
552: $scrout.=&selectbox('File Category','category',
553: $ENV{'form.category'},
554: 'any','Any category',
555: undef,
556: (&Apache::loncommon::filecategories()));
557: $ENV{'form.language'}='any' unless length($ENV{'form.language'});
558: #----------------------------------------------------------------
559: # Allow restriction to multiple domains.
560: # I make the crazy assumption that there will never be a domain 'any'.
561: #
562: $ENV{'form.domains'} = 'any' if (! exists($ENV{'form.domains'}));
563: my @allowed_domains = (ref($ENV{'form.domains'}) ? @{$ENV{'form.domains'}}
564: : ($ENV{'form.domains'}) );
565: my %domain_hash = ();
566: foreach (@allowed_domains) {
567: $domain_hash{$_}++;
568: }
569: my @domains =&Apache::loncommon::get_domains();
570: # adjust the size of the select box
571: my $size = 4;
572: my $size = (scalar @domains < ($size - 1) ? scalar @domains + 1 : $size);
573: $scrout.="\n".'<font color="#800000" face="helvetica"><b>'.
574: 'DOMAINS</b></font><br />'.
575: '<select name="domains" size="'.$size.'" multiple>'."\n".
576: '<option name="any" value="any" '.
577: ($domain_hash{'any'}? 'selected ' :'').
578: '>all domains</option>'."\n";
579: foreach my $dom (sort @domains) {
580: $scrout.="<option name=\"$dom\" ".
581: ($domain_hash{$dom} ? 'selected ' :'').">$dom</option>\n";
582: }
583: $scrout.="</select>\n";
584: #----------------------------------------------------------------
585: $scrout.=&selectbox('Limit by language','language',
586: $ENV{'form.language'},'any','Any Language',
587: \&{Apache::loncommon::languagedescription},
588: (&Apache::loncommon::languageids),
589: );
590: # ------------------------------------------------ Compute date selection boxes
591: $scrout.=<<CREATIONDATESTART;
592: <p>
593: <font color="#800000" face="helvetica"><b>LIMIT BY CREATION DATE RANGE:</b>
594: </font>
595: <br />
596: between:
597: CREATIONDATESTART
598: $scrout.=&dateboxes('creationdatestart',1,1,1976,
599: $ENV{'form.creationdatestart_month'},
600: $ENV{'form.creationdatestart_day'},
601: $ENV{'form.creationdatestart_year'},
602: );
603: $scrout.="and:\n";
604: $scrout.=&dateboxes('creationdateend',12,31,2051,
605: $ENV{'form.creationdateend_month'},
606: $ENV{'form.creationdateend_day'},
607: $ENV{'form.creationdateend_year'},
608: );
609: $scrout.="</p>";
610: $scrout.=<<LASTREVISIONDATESTART;
611: <p>
612: <font color="#800000" face="helvetica"><b>LIMIT BY LAST REVISION DATE RANGE:
613: </b></font>
614: <br />between:
615: LASTREVISIONDATESTART
616: $scrout.=&dateboxes('lastrevisiondatestart',1,1,1976,
617: $ENV{'form.lastrevisiondatestart_month'},
618: $ENV{'form.lastrevisiondatestart_day'},
619: $ENV{'form.lastrevisiondatestart_year'},
620: );
621: $scrout.=<<LASTREVISIONDATEEND;
622: and:
623: LASTREVISIONDATEEND
624: $scrout.=&dateboxes('lastrevisiondateend',12,31,2051,
625: $ENV{'form.lastrevisiondateend_month'},
626: $ENV{'form.lastrevisiondateend_day'},
627: $ENV{'form.lastrevisiondateend_year'},
628: );
629: $scrout.='</p>';
630: $ENV{'form.copyright'}='any' unless length($ENV{'form.copyright'});
631: $scrout.=&selectbox('Limit by copyright/distribution','copyright',
632: $ENV{'form.copyright'},
633: 'any','Any copyright/distribution',
634: \&{Apache::loncommon::copyrightdescription},
635: (&Apache::loncommon::copyrightids),
636: );
637: # ------------------------------------------- Compute customized metadata field
638: # $scrout.=<<CUSTOMMETADATA;
639: #<p>
640: #<font color="#800000" face="helvetica"><b>LIMIT BY SPECIAL METADATA FIELDS:</b>
641: #</font>
642: #For resource-specific metadata, enter in an expression in the form of
643: #<i>key</i>=<i>value</i> separated by operators such as AND, OR or NOT.<br />
644: #<b>Example:</b> grandmother=75 OR grandfather=85
645: #<br />
646: #CUSTOMMETADATA
647: # $scrout.=&simpletextfield('custommetadata',$ENV{'form.custommetadata'});
648: # $scrout.=<<CUSTOMSHOW;
649: #<p>
650: #<font color="#800000" face="helvetica"><b>SHOW SPECIAL METADATA FIELDS:</b>
651: #</font>
652: #Enter in a space-separated list of special metadata fields to show
653: #in a fielded listing for each record result.
654: #<br />
655: #CUSTOMSHOW
656: # $scrout.=&simpletextfield('customshow',$ENV{'form.customshow'});
657: $scrout.=<<ENDDOCUMENT;
658: $advanced_buttons
659: </form>
660: </body>
661: </html>
662: ENDDOCUMENT
663: $r->print($scrout);
664: return;
665: }
666:
667: ######################################################################
668: ######################################################################
669:
670: =pod
671:
672: =item &get_persistent_form_data
673:
674: Inputs: filename of database
675:
676: Outputs: returns undef on database errors.
677:
678: This function is the reverse of &make_persistent() for form data.
679: Retrieve persistent data from %persistent_db. Retrieved items will have their
680: values unescaped. If a form value already exists in $ENV, it will not be
681: overwritten. Form values that are array references may have values appended
682: to them.
683:
684: =cut
685:
686: ######################################################################
687: ######################################################################
688: sub get_persistent_form_data {
689: my $filename = shift;
690: return 0 if (! -e $filename);
691: return undef if (! tie(%persistent_db,'GDBM_File',$filename,
692: &GDBM_READER(),0640));
693: #
694: # These make sure we do not get array references printed out as 'values'.
695: my %arrays_allowed = ('form.category'=>1,'form.domains'=>1);
696: #
697: # Loop through the keys, looking for 'form.'
698: foreach my $name (keys(%persistent_db)) {
699: next if ($name !~ /^form./);
700: next if (exists($ENV{$name}));
701: my @values = map {
702: &Apache::lonnet::unescape($_);
703: } split(',',$persistent_db{$name});
704: next if (@values <1);
705: if ($arrays_allowed{$name}) {
706: $ENV{$name} = [@values];
707: } else {
708: $ENV{$name} = $values[0] if ($values[0]);
709: }
710: }
711: untie (%persistent_db);
712: return 1;
713: }
714: ######################################################################
715: ######################################################################
716:
717: =pod
718:
719: =item &get_persistent_data
720:
721: Inputs: filename of database, ref to array of values to recover.
722:
723: Outputs: array of values. Returns undef on error.
724:
725: This function is the reverse of &make_persistent();
726: Retrieve persistent data from %persistent_db. Retrieved items will have their
727: values unescaped. If the item contains commas (before unescaping), the
728: returned value will be an array pointer.
729:
730: =cut
731:
732: ######################################################################
733: ######################################################################
734: sub get_persistent_data {
735: my $filename = shift;
736: my @Vars = @{shift()};
737: my @Values; # Return array
738: return undef if (! -e $filename);
739: return undef if (! tie(%persistent_db,'GDBM_File',$filename,
740: &GDBM_READER(),0640));
741: foreach my $name (@Vars) {
742: if (! exists($persistent_db{$name})) {
743: push @Values, undef;
744: next;
745: }
746: my @values = map {
747: &Apache::lonnet::unescape($_);
748: } split(',',$persistent_db{$name});
749: if (@values <= 1) {
750: push @Values,$values[0];
751: } else {
752: push @Values,\@values;
753: }
754: }
755: untie (%persistent_db);
756: return @Values;
757: }
758:
759: ######################################################################
760: ######################################################################
761:
762: =pod
763:
764: =item &make_persistent()
765:
766: Inputs: Hash of values to save, filename of persistent database.
767:
768: Store variables away to the %persistent_db.
769: Values will be escaped. Values that are array pointers will have their
770: elements escaped and concatenated in a comma seperated string.
771:
772: =cut
773:
774: ######################################################################
775: ######################################################################
776: sub make_persistent {
777: my %save = %{shift()};
778: my $filename = shift;
779: return undef if (! tie(%persistent_db,'GDBM_File',
780: $filename,&GDBM_WRCREAT(),0640));
781: foreach my $name (keys(%save)) {
782: my @values = (ref($save{$name}) ? @{$save{$name}} : ($save{$name}));
783: # We handle array references, but not recursively.
784: my $store = join(',', map { &Apache::lonnet::escape($_); } @values );
785: $persistent_db{$name} = $store;
786: }
787: untie(%persistent_db);
788: return 1;
789: }
790:
791: ######################################################################
792: ######################################################################
793:
794: =pod
795:
796: =item &make_form_data_persistent()
797:
798: Inputs: filename of persistent database.
799:
800: Store most form variables away to the %persistent_db.
801: Values will be escaped. Values that are array pointers will have their
802: elements escaped and concatenated in a comma seperated string.
803:
804: =cut
805:
806: ######################################################################
807: ######################################################################
808: sub make_form_data_persistent {
809: my $r = shift;
810: my $filename = shift;
811: my %save;
812: foreach (keys(%ENV)) {
813: next if (!/^form/ || /submit/);
814: $save{$_} = $ENV{$_};
815: }
816: return &make_persistent(\%save,$filename);
817: }
818:
819: ######################################################################
820: # HTML form building functions #
821: ######################################################################
822:
823: =pod
824:
825: =item HTML form building functions
826:
827: =over 4
828:
829: =cut
830:
831: ###############################################
832: ###############################################
833:
834: =pod
835:
836: =item &simpletextfield()
837:
838: Inputs: $name,$value,$size
839:
840: Returns a text input field with the given name, value, and size.
841: If size is not specified, a value of 20 is used.
842:
843: =cut
844:
845: ###############################################
846: ###############################################
847:
848: sub simpletextfield {
849: my ($name,$value,$size)=@_;
850: $size = 20 if (! defined($size));
851: return '<input type="text" name="'.$name.
852: '" size="'.$size.'" value="'.$value.'" />';
853: }
854:
855: ###############################################
856: ###############################################
857:
858: =pod
859:
860: =item &simplecheckbox()
861:
862: Inputs: $name,$value
863:
864: Returns a simple check box with the given $name.
865: If $value eq 'on' the box is checked.
866:
867: =cut
868:
869: ###############################################
870: ###############################################
871:
872: sub simplecheckbox {
873: my ($name,$value)=@_;
874: my $checked='';
875: $checked="checked" if $value eq 'on';
876: return '<input type="checkbox" name="'.$name.'" '. $checked . ' />';
877: }
878:
879: ###############################################
880: ###############################################
881:
882: =pod
883:
884: =item &fieldtitle()
885:
886: Input: $title
887:
888: Returns a scalar with html which will display $title as a search
889: field heading.
890:
891: =cut
892:
893: ###############################################
894: ###############################################
895:
896: sub fieldtitle {
897: my $title = uc(shift());
898: return '<font color="#800000" face="helvetica"><b>'.$title.
899: ': </b></font>';
900: }
901:
902: ###############################################
903: ###############################################
904:
905: =pod
906:
907: =item &searchphrasefield()
908:
909: Inputs: $title,$name,$value
910:
911: Returns html for a title line and an input field for entering search terms.
912: The entry field (which is where the $name and $value are used) is a 50 column
913: simpletextfield. The html returned is for a row in a three column table.
914:
915: =cut
916:
917: ###############################################
918: ###############################################
919:
920: sub searchphrasefield {
921: my ($title,$name,$value)=@_;
922: return '<tr><td>'.&fieldtitle($title).'</td><td>'.
923: &simpletextfield($name,$value,50)."</td><td> </td></tr>\n";
924: }
925:
926: ###############################################
927: ###############################################
928:
929: =pod
930:
931: =item &searchphrasefield_with_related()
932:
933: Inputs: $title,$name,$value
934:
935: Returns html for a title line and an input field for entering search terms
936: and a check box for 'related words'. The entry field (which is where the
937: $name and $value are used) is a 50 column simpletextfield. The name of
938: the related words checkbox is "$name_related".
939:
940: =cut
941:
942: ###############################################
943: ###############################################
944:
945: sub searchphrasefield_with_related {
946: my ($title,$name,$value)=@_;
947: return '<tr><td>'.&fieldtitle($title).'</td><td>'.
948: &simpletextfield($name,$value,50).'</td><td align="center"> '.
949: &simplecheckbox($name.'_related',$ENV{'form.'.$name.'_related'}).
950: " </td></tr>\n";
951: }
952:
953: ###############################################
954: ###############################################
955:
956: =pod
957:
958: =item &dateboxes()
959:
960: Returns html selection form elements for the specification of
961: the day, month, and year.
962:
963: =cut
964:
965: ###############################################
966: ###############################################
967:
968: sub dateboxes {
969: my ($name,$defaultmonth,$defaultday,$defaultyear,
970: $currentmonth,$currentday,$currentyear)=@_;
971: ($defaultmonth,$defaultday,$defaultyear)=('','','');
972: #
973: # Day
974: my $day=<<END;
975: <select name="${name}_day">
976: <option value='$defaultday'> </option>
977: END
978: for (my $i = 1; $i<=31; $i++) {
979: $day.="<option value=\"$i\">$i</option>\n";
980: }
981: $day.="</select>\n";
982: $day=~s/(\"$currentday\")/$1 SELECTED/ if length($currentday);
983: #
984: # Month
985: my $month=<<END;
986: <select name="${name}_month">
987: <option value='$defaultmonth'> </option>
988: END
989: my $i = 1;
990: foreach (qw/January February March April May June
991: July August September October November December /){
992: $month .="<option value=\"$i\">$_</option>\n";
993: $i++;
994: }
995: $month.="</select>\n";
996: $month=~s/(\"$currentmonth\")/$1 SELECTED/ if length($currentmonth);
997: #
998: # Year (obviously)
999: my $year=<<END;
1000: <select name="${name}_year">
1001: <option value='$defaultyear'> </option>
1002: END
1003: my $maxyear = 2051;
1004: for (my $i = 1976; $i<=$maxyear; $i++) {
1005: $year.="<option value=\"$i\">$i</option>\n";
1006: }
1007: $year.="</select>\n";
1008: $year=~s/(\"$currentyear\")/$1 SELECTED/ if length($currentyear);
1009: return "$month$day$year";
1010: }
1011:
1012: ###############################################
1013: ###############################################
1014:
1015: =pod
1016:
1017: =item &selectbox()
1018:
1019: Returns a scalar containing an html <select> form.
1020:
1021: Inputs:
1022:
1023: =over 4
1024:
1025: =item $title
1026:
1027: Printed above the select box, in uppercase. If undefined, only a select
1028: box will be returned, with no additional html.
1029:
1030: =item $name
1031:
1032: The name element of the <select> tag.
1033:
1034: =item $default
1035:
1036: The default value of the form. Can be $anyvalue, or in @idlist.
1037:
1038: =item $anyvalue
1039:
1040: The <option value="..."> used to indicate a default of
1041: none of the values. Can be undef.
1042:
1043: =item $anytag
1044:
1045: The text associate with $anyvalue above.
1046:
1047: =item $functionref
1048:
1049: Each element in @idlist will be passed as a parameter
1050: to the function referenced here. The return value of the function should
1051: be a scalar description of the items. If this value is undefined the
1052: description of each item in @idlist will be the item name.
1053:
1054: =item @idlist
1055:
1056: The items to be selected from. One of these or $anyvalue will be the
1057: value returned by the form element, $ENV{form.$name}.
1058:
1059: =back
1060:
1061: =cut
1062:
1063: ###############################################
1064:
1065: sub selectbox {
1066: my ($title,$name,$default,$anyvalue,$anytag,$functionref,@idlist)=@_;
1067: if (! defined($functionref)) { $functionref = sub { $_[0]}; }
1068: my $selout='';
1069: if (defined($title)) {
1070: my $uctitle=uc($title);
1071: $selout="\n".'<p><font color="#800000" face="helvetica">'.
1072: '<b>'.$uctitle.': </b></font>';
1073: }
1074: $selout .= '<select name="'.$name.'">';
1075: unshift @idlist,$anyvalue if (defined($anyvalue));
1076: foreach (@idlist) {
1077: $selout.='<option value="'.$_.'"';
1078: if ($_ eq $default and !/^any$/) {
1079: $selout.=' selected >'.&{$functionref}($_).'</option>';
1080: }
1081: elsif ($_ eq $default and /^$anyvalue$/) {
1082: $selout.=' selected >'.$anytag.'</option>';
1083: }
1084: else {$selout.='>'.&{$functionref}($_).'</option>';}
1085: }
1086: return $selout.'</select>'.(defined($title)?'</p>':' ');
1087: }
1088:
1089: ######################################################################
1090: # End of HTML form building functions #
1091: ######################################################################
1092:
1093: =pod
1094:
1095: =back
1096:
1097: =cut
1098:
1099:
1100: ######################################################################
1101: ######################################################################
1102:
1103: =pod
1104:
1105: =item &parse_advanced_search()
1106:
1107: Parse advanced search form and return the following:
1108:
1109: =over 4
1110:
1111: =item $query Scalar containing an SQL query.
1112:
1113: =item $customquery Scalar containing a custom query.
1114:
1115: =item $customshow Scalar containing commands to show custom metadata.
1116:
1117: =item $libraries_to_query Reference to array of domains to search.
1118:
1119: =back
1120:
1121: =cut
1122:
1123: ######################################################################
1124: ######################################################################
1125: sub parse_advanced_search {
1126: my ($r,$closebutton)=@_;
1127: my $fillflag=0;
1128: my $pretty_search_string = "<br />\n";
1129: # Clean up fields for safety
1130: for my $field ('title','author','subject','keywords','url','version',
1131: 'creationdatestart_month','creationdatestart_day',
1132: 'creationdatestart_year','creationdateend_month',
1133: 'creationdateend_day','creationdateend_year',
1134: 'lastrevisiondatestart_month','lastrevisiondatestart_day',
1135: 'lastrevisiondatestart_year','lastrevisiondateend_month',
1136: 'lastrevisiondateend_day','lastrevisiondateend_year',
1137: 'notes','abstract','mime','language','owner',
1138: 'custommetadata','customshow','category') {
1139: $ENV{"form.$field"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1140: }
1141: foreach ('mode','form','element') {
1142: # is this required? Hmmm.
1143: next unless (exists($ENV{"form.$_"}));
1144: $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"});
1145: $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1146: }
1147: # Preprocess the category form element.
1148: $ENV{'form.category'} = 'any' if (ref($ENV{'form.category'}));
1149: if ($ENV{'form.category'} ne 'any') {
1150: my @extensions = &Apache::loncommon::filecategorytypes
1151: ($ENV{'form.category'});
1152: $ENV{'form.mime'} = join ' OR ',@extensions;
1153: }
1154: # Check to see if enough information was filled in
1155: for my $field ('title','author','subject','keywords','url','version',
1156: 'notes','abstract','mime','language','owner',
1157: 'custommetadata') {
1158: if (&filled($ENV{"form.$field"})) {
1159: $fillflag++;
1160: }
1161: }
1162: unless ($fillflag) {
1163: &output_blank_field_error($r,$closebutton,'phase=disp_adv');
1164: return ;
1165: }
1166: # Turn the form input into a SQL-based query
1167: my $query='';
1168: my @queries;
1169: my $font = '<font color="#800000" face="helvetica">';
1170: # Evaluate logical expression AND/OR/NOT phrase fields.
1171: foreach my $field ('title','author','subject','notes','abstract','url',
1172: 'keywords','version','owner','mime') {
1173: if ($ENV{'form.'.$field}) {
1174: my $searchphrase = $ENV{'form.'.$field};
1175: $pretty_search_string .= $font."$field</font> contains <b>".
1176: $searchphrase."</b>";
1177: if ($ENV{'form.'.$field.'_related'}) {
1178: my @New_Words;
1179: ($searchphrase,@New_Words) = &related_version($searchphrase);
1180: if (@New_Words) {
1181: $pretty_search_string .= " with related words: ".
1182: "<b>@New_Words</b>.";
1183: } else {
1184: $pretty_search_string .= " with no related words.";
1185: }
1186: }
1187: $pretty_search_string .= "<br />\n";
1188: push @queries,&build_SQL_query($field,$searchphrase);
1189: }
1190: }
1191: # I dislike the hack below.
1192: if ($ENV{'form.category'}) {
1193: $ENV{'form.mime'}='';
1194: }
1195: # Evaluate option lists
1196: if ($ENV{'form.language'} and $ENV{'form.language'} ne 'any') {
1197: push @queries,"(language like \"$ENV{'form.language'}\")";
1198: $pretty_search_string.=$font."language</font>= ".
1199: &Apache::loncommon::languagedescription($ENV{'form.language'}).
1200: "<br />\n";
1201: }
1202: if ($ENV{'form.copyright'} and $ENV{'form.copyright'} ne 'any') {
1203: push @queries,"(copyright like \"$ENV{'form.copyright'}\")";
1204: $pretty_search_string.=$font."copyright</font> = ".
1205: &Apache::loncommon::copyrightdescription($ENV{'form.copyright'}).
1206: "<br \>\n";
1207: }
1208: #
1209: # Evaluate date windows
1210: my $datequery=&build_date_queries(
1211: $ENV{'form.creationdatestart_month'},
1212: $ENV{'form.creationdatestart_day'},
1213: $ENV{'form.creationdatestart_year'},
1214: $ENV{'form.creationdateend_month'},
1215: $ENV{'form.creationdateend_day'},
1216: $ENV{'form.creationdateend_year'},
1217: $ENV{'form.lastrevisiondatestart_month'},
1218: $ENV{'form.lastrevisiondatestart_day'},
1219: $ENV{'form.lastrevisiondatestart_year'},
1220: $ENV{'form.lastrevisiondateend_month'},
1221: $ENV{'form.lastrevisiondateend_day'},
1222: $ENV{'form.lastrevisiondateend_year'},
1223: );
1224: # Test to see if date windows are legitimate
1225: if ($datequery=~/^Incorrect/) {
1226: &output_date_error($r,$datequery,$closebutton);
1227: return ;
1228: } elsif ($datequery) {
1229: # Here is where you would set up pretty_search_string to output
1230: # date query information.
1231: push @queries,$datequery;
1232: }
1233: # Process form information for custom metadata querying
1234: my $customquery=undef;
1235: # if ($ENV{'form.custommetadata'}) {
1236: # $pretty_search_string .=$font."Custom Metadata Search</font>: <b>".
1237: # $ENV{'form.custommetadata'}."</b><br />\n";
1238: # $customquery=&build_custommetadata_query('custommetadata',
1239: # $ENV{'form.custommetadata'});
1240: # }
1241: my $customshow=undef;
1242: # if ($ENV{'form.customshow'}) {
1243: # $pretty_search_string .=$font."Custom Metadata Display</font>: <b>".
1244: # $ENV{'form.customshow'}."</b><br />\n";
1245: # $customshow=$ENV{'form.customshow'};
1246: # $customshow=~s/[^\w\s]//g;
1247: # my @fields=split(/\s+/,$customshow);
1248: # $customshow=join(" ",@fields);
1249: # }
1250: ## ---------------------------------------------------------------
1251: ## Deal with restrictions to given domains
1252: ##
1253: my $libraries_to_query = undef;
1254: # $ENV{'form.domains'} can be either a scalar or an array reference.
1255: # We need an array.
1256: my @allowed_domains = (ref($ENV{'form.domains'}) ? @{$ENV{'form.domains'}}
1257: : ($ENV{'form.domains'}) );
1258: my %domain_hash = ();
1259: my $pretty_domains_string;
1260: foreach (@allowed_domains) {
1261: $domain_hash{$_}++;
1262: }
1263: if ($domain_hash{'any'}) {
1264: $pretty_domains_string = "In all LON-CAPA domains.";
1265: } else {
1266: if (@allowed_domains > 1) {
1267: $pretty_domains_string = "In LON-CAPA domains:";
1268: } else {
1269: $pretty_domains_string = "In LON-CAPA domain ";
1270: }
1271: foreach (sort @allowed_domains) {
1272: $pretty_domains_string .= "<b>".$_."</b> ";
1273: }
1274: foreach (keys(%Apache::lonnet::libserv)) {
1275: if (exists($domain_hash{$Apache::lonnet::hostdom{$_}})) {
1276: push @$libraries_to_query,$_;
1277: }
1278: }
1279: }
1280: $pretty_search_string .= $pretty_domains_string."<br />\n";
1281: #
1282: if (@queries) {
1283: $query=join(" AND ",@queries);
1284: $query="select * from metadata where $query";
1285: } elsif ($customquery) {
1286: $query = '';
1287: }
1288: return ($query,$customquery,$customshow,$libraries_to_query,
1289: $pretty_search_string);
1290: }
1291:
1292: ######################################################################
1293: ######################################################################
1294:
1295: =pod
1296:
1297: =item &parse_basic_search()
1298:
1299: Parse the basic search form and return a scalar containing an sql query.
1300:
1301: =cut
1302:
1303: ######################################################################
1304: ######################################################################
1305: sub parse_basic_search {
1306: my ($r,$closebutton)=@_;
1307: # Clean up fields for safety
1308: for my $field ('basicexp') {
1309: $ENV{"form.$field"}=~s/[^\w\s\(\)\-]//g;
1310: }
1311: foreach ('mode','form','element') {
1312: # is this required? Hmmm.
1313: next unless (exists($ENV{"form.$_"}));
1314: $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"});
1315: $ENV{"form.$_"}=~s/[^\w\/\s\(\)\=\-\"\']//g;
1316: }
1317:
1318: # Check to see if enough is filled in
1319: unless (&filled($ENV{'form.basicexp'})) {
1320: &output_blank_field_error($r,$closebutton,'phase=disp_basic');
1321: return OK;
1322: }
1323: my $pretty_search_string = '<b>'.$ENV{'form.basicexp'}.'</b>';
1324: my $search_string = $ENV{'form.basicexp'};
1325: if ($ENV{'form.related'}) {
1326: my @New_Words;
1327: ($search_string,@New_Words) = &related_version($ENV{'form.basicexp'});
1328: if (@New_Words) {
1329: $pretty_search_string .= " with related words: <b>@New_Words</b>.";
1330: } else {
1331: $pretty_search_string .= " with no related words.";
1332: }
1333: }
1334: # Build SQL query string based on form page
1335: my $query='';
1336: my $concatarg=join('," ",',
1337: ('title', 'author', 'subject', 'notes', 'abstract',
1338: 'keywords'));
1339: $concatarg='title' if $ENV{'form.titleonly'};
1340: $query=&build_SQL_query('concat('.$concatarg.')',$search_string);
1341: $pretty_search_string .= "<br />\n";
1342: return 'select * from metadata where '.$query,$pretty_search_string;
1343: }
1344:
1345:
1346: ######################################################################
1347: ######################################################################
1348:
1349: =pod
1350:
1351: =item &related_version
1352:
1353: Modifies an input string to include related words. Words in the string
1354: are replaced with parenthesized lists of 'OR'd words. For example
1355: "torque" is replaced with "(torque OR word1 OR word2 OR ...)".
1356:
1357: Note: Using this twice on a string is probably silly.
1358:
1359: =cut
1360:
1361: ######################################################################
1362: ######################################################################
1363: sub related_version {
1364: my $search_string = shift;
1365: my $result = $search_string;
1366: my %New_Words = ();
1367: while ($search_string =~ /(\w+)/cg) {
1368: my $word = $1;
1369: next if (lc($word) =~ /\b(or|and|not)\b/);
1370: my @Words = &Apache::loncommon::get_related_words($word);
1371: @Words = ($#Words>4? @Words[0..4] : @Words);
1372: foreach (@Words) { $New_Words{$_}++;}
1373: my $replacement = join " OR ", ($word,@Words);
1374: $result =~ s/(\b)$word(\b)/$1($replacement)$2/g;
1375: }
1376: return $result,sort(keys(%New_Words));
1377: }
1378:
1379: ######################################################################
1380: ######################################################################
1381:
1382: =pod
1383:
1384: =item &build_SQL_query()
1385:
1386: Builds a SQL query string from a logical expression with AND/OR keywords
1387: using Text::Query and &recursive_SQL_query_builder()
1388:
1389: =cut
1390:
1391: ######################################################################
1392: ######################################################################
1393: sub build_SQL_query {
1394: my ($field_name,$logic_statement)=@_;
1395: my $q=new Text::Query('abc',
1396: -parse => 'Text::Query::ParseAdvanced',
1397: -build => 'Text::Query::Build');
1398: $q->prepare($logic_statement);
1399: my $matchexp=${$q}{'matchexp'}; chomp $matchexp;
1400: my $sql_query=&recursive_SQL_query_build($field_name,$matchexp);
1401: return $sql_query;
1402: }
1403:
1404: ######################################################################
1405: ######################################################################
1406:
1407: =pod
1408:
1409: =item &build_custommetadata_query()
1410:
1411: Constructs a custom metadata query using a rather heinous regular
1412: expression.
1413:
1414: =cut
1415:
1416: ######################################################################
1417: ######################################################################
1418: sub build_custommetadata_query {
1419: my ($field_name,$logic_statement)=@_;
1420: my $q=new Text::Query('abc',
1421: -parse => 'Text::Query::ParseAdvanced',
1422: -build => 'Text::Query::BuildAdvancedString');
1423: $q->prepare($logic_statement);
1424: my $matchexp=${$q}{'-parse'}{'-build'}{'matchstring'};
1425: # quick fix to change literal into xml tag-matching
1426: # will eventually have to write a separate builder module
1427: # wordone=wordtwo becomes\<wordone\>[^\<] *wordtwo[^\<]*\<\/wordone\>
1428: $matchexp =~ s/(\w+)\\=([\w\\\+]+)?# wordone=wordtwo is changed to
1429: /\\<$1\\>?# \<wordone\>
1430: \[\^\\<\]?# [^\<]
1431: \*$2\[\^\\<\]?# *wordtwo[^\<]
1432: \*\\<\\\/$1\\>?# *\<\/wordone\>
1433: /g;
1434: return $matchexp;
1435: }
1436:
1437: ######################################################################
1438: ######################################################################
1439:
1440: =pod
1441:
1442: =item &recursive_SQL_query_build()
1443:
1444: Recursively constructs an SQL query. Takes as input $dkey and $pattern.
1445:
1446: =cut
1447:
1448: ######################################################################
1449: ######################################################################
1450: sub recursive_SQL_query_build {
1451: my ($dkey,$pattern)=@_;
1452: my @matches=($pattern=~/(\[[^\]|\[]*\])/g);
1453: return $pattern unless @matches;
1454: foreach my $match (@matches) {
1455: $match=~/\[ (\w+)\s(.*) \]/;
1456: my ($key,$value)=($1,$2);
1457: my $replacement='';
1458: if ($key eq 'literal') {
1459: $replacement="($dkey like \"\%$value\%\")";
1460: }
1461: elsif ($key eq 'not') {
1462: $value=~s/like/not like/;
1463: # $replacement="($dkey not like $value)";
1464: $replacement="$value";
1465: }
1466: elsif ($key eq 'and') {
1467: $value=~/(.*[\"|\)]) ([|\(|\^].*)/;
1468: $replacement="($1 AND $2)";
1469: }
1470: elsif ($key eq 'or') {
1471: $value=~/(.*[\"|\)]) ([|\(|\^].*)/;
1472: $replacement="($1 OR $2)";
1473: }
1474: substr($pattern,
1475: index($pattern,$match),
1476: length($match),
1477: $replacement
1478: );
1479: }
1480: &recursive_SQL_query_build($dkey,$pattern);
1481: }
1482:
1483: ######################################################################
1484: ######################################################################
1485:
1486: =pod
1487:
1488: =item &build_date_queries()
1489:
1490: Builds a SQL logic query to check time/date entries.
1491: Also reports errors (check for /^Incorrect/).
1492:
1493: =cut
1494:
1495: ######################################################################
1496: ######################################################################
1497: sub build_date_queries {
1498: my ($cmonth1,$cday1,$cyear1,$cmonth2,$cday2,$cyear2,
1499: $lmonth1,$lday1,$lyear1,$lmonth2,$lday2,$lyear2)=@_;
1500: my @queries;
1501: if ($cmonth1 or $cday1 or $cyear1 or $cmonth2 or $cday2 or $cyear2) {
1502: unless ($cmonth1 and $cday1 and $cyear1 and
1503: $cmonth2 and $cday2 and $cyear2) {
1504: return "Incorrect entry for the creation date. You must specify ".
1505: "a starting month, day, and year and an ending month, ".
1506: "day, and year.";
1507: }
1508: my $cnumeric1=sprintf("%d%2d%2d",$cyear1,$cmonth1,$cday1);
1509: $cnumeric1+=0;
1510: my $cnumeric2=sprintf("%d%2d%2d",$cyear2,$cmonth2,$cday2);
1511: $cnumeric2+=0;
1512: if ($cnumeric1>$cnumeric2) {
1513: return "Incorrect entry for the creation date. The starting ".
1514: "date must occur before the ending date.";
1515: }
1516: my $cquery="(creationdate BETWEEN '$cyear1-$cmonth1-$cday1' AND '".
1517: "$cyear2-$cmonth2-$cday2 23:59:59')";
1518: push @queries,$cquery;
1519: }
1520: if ($lmonth1 or $lday1 or $lyear1 or $lmonth2 or $lday2 or $lyear2) {
1521: unless ($lmonth1 and $lday1 and $lyear1 and
1522: $lmonth2 and $lday2 and $lyear2) {
1523: return "Incorrect entry for the last revision date. You must ".
1524: "specify a starting month, day, and year and an ending ".
1525: "month, day, and year.";
1526: }
1527: my $lnumeric1=sprintf("%d%2d%2d",$lyear1,$lmonth1,$lday1);
1528: $lnumeric1+=0;
1529: my $lnumeric2=sprintf("%d%2d%2d",$lyear2,$lmonth2,$lday2);
1530: $lnumeric2+=0;
1531: if ($lnumeric1>$lnumeric2) {
1532: return "Incorrect entry for the last revision date. The ".
1533: "starting date must occur before the ending date.";
1534: }
1535: my $lquery="(lastrevisiondate BETWEEN '$lyear1-$lmonth1-$lday1' AND '".
1536: "$lyear2-$lmonth2-$lday2 23:59:59')";
1537: push @queries,$lquery;
1538: }
1539: if (@queries) {
1540: return join(" AND ",@queries);
1541: }
1542: return '';
1543: }
1544:
1545: ######################################################################
1546: ######################################################################
1547:
1548: =pod
1549:
1550: =item ©right_check()
1551:
1552: =cut
1553:
1554: ######################################################################
1555: ######################################################################
1556: sub copyright_check {
1557: my $Metadata = shift;
1558: # Check copyright tags and skip results the user cannot use
1559: my (undef,undef,$resdom,$resname) = split('/',
1560: $Metadata->{'url'});
1561: # Check for priv
1562: if (($Metadata->{'copyright'} eq 'priv') &&
1563: (($ENV{'user.name'} ne $resname) &&
1564: ($ENV{'user.domain'} ne $resdom))) {
1565: return 0;
1566: }
1567: # Check for domain
1568: if (($Metadata->{'copyright'} eq 'domain') &&
1569: ($ENV{'user.domain'} ne $resdom)) {
1570: return 0;
1571: }
1572: return 1;
1573: }
1574:
1575:
1576: ######################################################################
1577: ######################################################################
1578:
1579: =pod
1580:
1581: =item &ensure_db_and_table
1582:
1583: Ensure we can get lonmysql to connect to the database and the table we
1584: need exists.
1585:
1586: Inputs: $r, table id
1587:
1588: Returns: undef on error, 1 if the table exists.
1589:
1590: =cut
1591:
1592: ######################################################################
1593: ######################################################################
1594: sub ensure_db_and_table {
1595: my ($r,$table) = @_;
1596: ##
1597: ## Sanity check the table id.
1598: ##
1599: if (! defined($table) || $table eq '' || $table =~ /\D/ ) {
1600: $r->print("Unable to retrieve search results. ".
1601: "Unable to determine the table results were stored in. ".
1602: "</body></html>");
1603: return undef;
1604: }
1605: ##
1606: ## Make sure we can connect and the table exists.
1607: ##
1608: my $connection_result = &Apache::lonmysql::connect_to_db();
1609: if (!defined($connection_result)) {
1610: $r->print("Unable to connect to the MySQL database where your results".
1611: " are stored. </body></html>");
1612: &Apache::lonnet::logthis("lonsearchcat: unable to get lonmysql to".
1613: " connect to database.");
1614: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
1615: return undef;
1616: }
1617: my $table_check = &Apache::lonmysql::check_table($table);
1618: if (! defined($table_check)) {
1619: $r->print("A MySQL error has occurred.</form></body></html>");
1620: &Apache::lonnet::logthis("lonmysql was unable to determine the status".
1621: " of table ".$table);
1622: return undef;
1623: } elsif (! $table_check) {
1624: $r->print("The table of results could not be found.");
1625: &Apache::lonnet::logthis("The user requested a table, ".$table.
1626: ", that could not be found.");
1627: return undef;
1628: }
1629: return 1;
1630: }
1631:
1632: ######################################################################
1633: ######################################################################
1634:
1635: =pod
1636:
1637: =item &print_sort_form
1638:
1639: =cut
1640:
1641: ######################################################################
1642: ######################################################################
1643: sub print_sort_form {
1644: my ($r,$pretty_query_string) = @_;
1645: ##
1646: my %SortableFields =
1647: (id => 'Default',
1648: title => 'Title',
1649: author => 'Author',
1650: subject => 'Subject',
1651: url => 'URL',
1652: version => 'Version Number',
1653: mime => 'Mime type',
1654: lang => 'Language',
1655: owner => 'Owner/Publisher',
1656: copyright => 'Copyright',
1657: hostname => 'Host',
1658: creationdate => 'Creation Date',
1659: lastrevisiondate => 'Revision Date',
1660: );
1661: ##
1662: my $table = $ENV{'form.table'};
1663: return if (! &ensure_db_and_table($r,$table));
1664: ##
1665: ## Get the number of results
1666: ##
1667: my $total_results = &Apache::lonmysql::number_of_rows($table);
1668: if (! defined($total_results)) {
1669: $r->print("A MySQL error has occurred.</form></body></html>");
1670: &Apache::lonnet::logthis("lonmysql was unable to determine the number".
1671: " of rows in table ".$table);
1672: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
1673: return;
1674: }
1675: my $result;
1676: $result.=<<END;
1677: <html>
1678: <head>
1679: <script>
1680: function change_sort() {
1681: var newloc = "/adm/searchcat?phase=results";
1682: newloc += "&persistent_db_id=$ENV{'form.persistent_db_id'}";
1683: newloc += "&sortby=";
1684: newloc += document.forms.statusform.elements.sortby.value;
1685: parent.resultsframe.location= newloc;
1686: }
1687: </script>
1688: <title>Results</title>
1689: </head>
1690: $bodytag
1691: <form name="statusform" action="" method="post">
1692: <input type="hidden" name="Queue" value="" />
1693: END
1694:
1695: #<h2>Sort Results</h2>
1696: #Sort by: <select size="1" name="sortby" onchange="javascript:change_sort();">
1697: # $ENV{'form.sortby'} = 'id' if (! defined($ENV{'form.sortby'}));
1698: # foreach (keys(%SortableFields)) {
1699: # $result.="<option name=\"$_\"";
1700: # if ($_ eq $ENV{'form.sortby'}) {
1701: # $result.=" selected ";
1702: # }
1703: # $result.=" >$SortableFields{$_}</option>\n";
1704: # }
1705: # $result.="</select>\n";
1706: my $revise = &revise_button();
1707: $result.=<<END;
1708: <p>
1709: There are $total_results matches to your query. $revise
1710: </p><p>
1711: Search:$pretty_query_string
1712: </p>
1713: </form>
1714: </body>
1715: </html>
1716: END
1717: $r->print($result);
1718: return;
1719: }
1720:
1721: #####################################################################
1722: #####################################################################
1723:
1724: =pod
1725:
1726: =item MySQL Table Description
1727:
1728: MySQL table creation requires a precise description of the data to be
1729: stored. The use of the correct types to hold data is vital to efficient
1730: storage and quick retrieval of records. The columns must be described in
1731: the following format:
1732:
1733: =cut
1734:
1735: ##
1736: ## Restrictions:
1737: ## columns of type 'text' and 'blob' cannot have defaults.
1738: ## columns of type 'enum' cannot be used for FULLTEXT.
1739: ##
1740: my @DataOrder = qw/id title author subject url keywords version notes
1741: abstract mime lang owner copyright creationdate lastrevisiondate hostname/;
1742:
1743: my %Datatypes =
1744: ( id =>{ type => 'MEDIUMINT',
1745: restrictions => 'UNSIGNED NOT NULL',
1746: primary_key => 'yes',
1747: auto_inc => 'yes'
1748: },
1749: title =>{ type=>'TEXT'},
1750: author =>{ type=>'TEXT'},
1751: subject =>{ type=>'TEXT'},
1752: url =>{ type=>'TEXT',
1753: restrictions => 'NOT NULL' },
1754: keywords =>{ type=>'TEXT'},
1755: version =>{ type=>'TEXT'},
1756: notes =>{ type=>'TEXT'},
1757: abstract =>{ type=>'TEXT'},
1758: mime =>{ type=>'TEXT'},
1759: lang =>{ type=>'TEXT'},
1760: owner =>{ type=>'TEXT'},
1761: copyright =>{ type=>'TEXT'},
1762: hostname =>{ type=>'TEXT'},
1763: #--------------------------------------------------
1764: creationdate =>{ type=>'DATETIME'},
1765: lastrevisiondate =>{ type=>'DATETIME'},
1766: #--------------------------------------------------
1767: );
1768:
1769: my @Fullindicies =
1770: qw/title/;
1771: # qw/title author subject abstract mime language owner copyright/;
1772:
1773: ######################################################################
1774: ######################################################################
1775:
1776: =pod
1777:
1778: =item &create_results_table()
1779:
1780: Creates the table of search results by calling lonmysql. Stores the
1781: table id in $ENV{'form.table'}
1782:
1783: Inputs: none.
1784:
1785: Returns: the identifier of the table on success, undef on error.
1786:
1787: =cut
1788:
1789: ######################################################################
1790: ######################################################################
1791: sub create_results_table {
1792: my $table = &Apache::lonmysql::create_table
1793: ( { columns => \%Datatypes,
1794: column_order => \@DataOrder,
1795: fullindex => \@Fullindicies,
1796: } );
1797: if (defined($table)) {
1798: $ENV{'form.table'} = $table;
1799: return $table;
1800: }
1801: return undef; # Error...
1802: }
1803:
1804: ######################################################################
1805: ######################################################################
1806:
1807: =pod
1808:
1809: =item Search Status update functions
1810:
1811: Each of the following functions changes the values of one of the
1812: input fields used to display the search status to the user. The names
1813: should be explanatory.
1814:
1815: Inputs: Apache request handler ($r), text to display.
1816:
1817: Returns: Nothing.
1818:
1819: =over 4
1820:
1821: =item &update_count_status()
1822:
1823: =item &update_status()
1824:
1825: =item &update_seconds()
1826:
1827: =back
1828:
1829: =cut
1830:
1831: ######################################################################
1832: ######################################################################
1833: sub update_count_status {
1834: my ($r,$text) = @_;
1835: $text =~ s/\'/\\\'/g;
1836: $r->print
1837: ("<script>document.statusform.count.value = ' $text'</script>\n");
1838: $r->rflush();
1839: }
1840:
1841: sub update_status {
1842: my ($r,$text) = @_;
1843: $text =~ s/\'/\\\'/g;
1844: $r->print
1845: ("<script>document.statusform.status.value = ' $text'</script>\n");
1846: $r->rflush();
1847: }
1848:
1849: sub update_seconds {
1850: my ($r,$text) = @_;
1851: $text =~ s/\'/\\\'/g;
1852: $r->print
1853: ("<script>document.statusform.seconds.value = ' $text'</script>\n");
1854: $r->rflush();
1855: }
1856:
1857: ######################################################################
1858: ######################################################################
1859:
1860: =pod
1861:
1862: =item &revise_button
1863:
1864: Inputs: None
1865:
1866: Returns: html string for a 'revise search' button.
1867:
1868: =cut
1869:
1870: ######################################################################
1871: ######################################################################
1872: sub revise_button {
1873: my $revise_phase = 'disp_basic';
1874: $revise_phase = 'disp_adv' if ($ENV{'form.searchmode'} eq 'advanced');
1875: my $newloc = '/adm/searchcat'.
1876: '?persistent_db_id='.$ENV{'form.persistent_db_id'}.
1877: '&cleargroupsort=1'.
1878: '&phase='.$revise_phase;
1879: my $result = qq{<input type="button" value="Revise search" name="revise"} .
1880: qq{ onClick="parent.location='$newloc';" /> };
1881: return $result;
1882: }
1883:
1884: ######################################################################
1885: ######################################################################
1886:
1887: =pod
1888:
1889: =item &run_search
1890:
1891: =cut
1892:
1893: ######################################################################
1894: ######################################################################
1895: sub run_search {
1896: my ($r,$query,$customquery,$customshow,$serverlist,$pretty_string) = @_;
1897: my $connection = $r->connection;
1898: #
1899: # Timing variables
1900: #
1901: my $starttime = time;
1902: my $max_time = 30; # seconds for the search to complete
1903: #
1904: # Print run_search header
1905: #
1906: $r->print(<<END);
1907: <html>
1908: <head><title>Search Status</title></head>
1909: $bodytag
1910: <form name="statusform" action="" method="post">
1911: <input type="hidden" name="Queue" value="" />
1912: END
1913: # Check to see if $pretty_string has more than one carriage return.
1914: # Assume \n s are following <br /> s and truncate the value.
1915: # (there is probably a better way)...
1916: my @Lines = split /<br \/>/,$pretty_string;
1917: if (@Lines > 2) {
1918: $pretty_string = join '<br \>',(@Lines[0..2],'....<br />');
1919: }
1920: $r->print("Search: ".$pretty_string);
1921: $r->rflush();
1922: #
1923: # Determine the servers we need to contact.
1924: #
1925: my @Servers_to_contact;
1926: if (defined($serverlist)) {
1927: if (ref($serverlist) eq 'ARRAY') {
1928: @Servers_to_contact = @$serverlist;
1929: } else {
1930: @Servers_to_contact = ($serverlist);
1931: }
1932: } else {
1933: @Servers_to_contact = sort(keys(%Apache::lonnet::libserv));
1934: }
1935: my %Server_status;
1936: my $table =$ENV{'form.table'};
1937: if (! defined($table) || $table eq '' || $table =~ /\D/ ) {
1938: $r->print("Unable to determine table id to store search results in.".
1939: "The search has been aborted.</body></html>");
1940: return;
1941: }
1942: my $table_status = &Apache::lonmysql::check_table($table);
1943: if (! defined($table_status)) {
1944: $r->print("Unable to determine status of table.</body></html>");
1945: &Apache::lonnet::logthis("Bogus table id of $table for ".
1946: "$ENV{'user.name'} @ $ENV{'user.domain'}");
1947: &Apache::lonnet::logthis("lonmysql error = ".
1948: &Apache::lonmysql::get_error());
1949: return;
1950: }
1951: if (! $table_status) {
1952: $r->print("The table id,$table, we tried to use is invalid.".
1953: "The search has been aborted.</body></html>");
1954: return;
1955: }
1956: ##
1957: ## Prepare for the big loop.
1958: ##
1959: my $hitcountsum;
1960: my $server;
1961: my $status;
1962: my $revise = &revise_button();
1963: $r->print(<<END);
1964: <table>
1965: <tr><th>Status</th><th>Total Matches</th><th>Time Remaining</th><th></th></tr>
1966: <tr>
1967: <td><input type="text" name="status" value="" size="30" /></td>
1968: <td><input type="text" name="count" value="" size="10" /></td>
1969: <td><input type="text" name="seconds" value="" size="8" /></td>
1970: <td>$revise</td>
1971: </tr>
1972: </table>
1973: </form>
1974: END
1975: $r->rflush();
1976: my $time_remaining = $max_time - (time - $starttime) ;
1977: my $last_time = $time_remaining;
1978: &update_seconds($r,$time_remaining);
1979: while (($time_remaining > 0) &&
1980: ((@Servers_to_contact) || keys(%Server_status))) {
1981: # Send out a search request if it needs to be done.
1982: if (@Servers_to_contact) {
1983: # Contact one server
1984: my $server = shift(@Servers_to_contact);
1985: my $reply=&Apache::lonnet::metadata_query($query,$customquery,
1986: $customshow,[$server]);
1987: ($server) = keys(%$reply);
1988: $Server_status{$server} = $reply->{$server};
1989: &update_status($r,'contacting '.$server);
1990: } else {
1991: # wait a sec. to give time for files to be written
1992: # This sleep statement is here instead of outside the else
1993: # block because we do not want to pause if we have servers
1994: # left to contact.
1995: sleep(1);
1996: }
1997: #
1998: if (scalar (keys(%Server_status))) {
1999: &update_status($r,'waiting on '.(join(' ',keys(%Server_status))));
2000: }
2001: #
2002: # Loop through the servers we have contacted but do not
2003: # have results from yet, looking for results.
2004: while (my ($server,$status) = each(%Server_status)) {
2005: last if ($connection->aborted());
2006: if ($status eq 'con_lost') {
2007: delete ($Server_status{$server});
2008: next;
2009: }
2010: $status=~/^([\.\w]+)$/;
2011: my $datafile=$r->dir_config('lonDaemons').'/tmp/'.$1;
2012: if (-e $datafile && ! -e "$datafile.end") {
2013: &update_status($r,'Receiving results from '.$server);
2014: next;
2015: }
2016: last if ($connection->aborted());
2017: if (-e "$datafile.end") {
2018: &update_status($r,'Reading results from '.$server);
2019: if (-z "$datafile") {
2020: delete($Server_status{$server});
2021: next;
2022: }
2023: my $fh;
2024: if (!($fh=Apache::File->new($datafile))) {
2025: $r->print("Unable to open search results file for ".
2026: "server $server. Omitting from search");
2027: delete($Server_status{$server});
2028: next;
2029: }
2030: # Read in the whole file.
2031: while (my $result = <$fh>) {
2032: last if ($connection->aborted());
2033: # handle custom fields? Someday we will!
2034: chomp($result);
2035: next unless $result;
2036: # Parse the result.
2037: my %Fields = &parse_raw_result($result,$server);
2038: $Fields{'hostname'} = $server;
2039: next if (! ©right_check(\%Fields));
2040: # Store the result in the mysql database
2041: my $result = &Apache::lonmysql::store_row($table,\%Fields);
2042: if (! defined($result)) {
2043: $r->print(&Apache::lonmysql::get_error());
2044: }
2045: # $r->print(&Apache::lonmysql::get_debug());
2046: $hitcountsum ++;
2047: $time_remaining = $max_time - (time - $starttime) ;
2048: if ($last_time - $time_remaining > 0) {
2049: &update_seconds($r,$time_remaining);
2050: $last_time = $time_remaining;
2051: }
2052: if ($hitcountsum % 50 == 0) {
2053: &update_count_status($r,$hitcountsum);
2054: }
2055: } # End of foreach (@results)
2056: $fh->close();
2057: # $server is only deleted if the results file has been
2058: # found and (successfully) opened. This may be a bad idea.
2059: delete($Server_status{$server});
2060: }
2061: last if ($connection->aborted());
2062: &update_count_status($r,$hitcountsum);
2063: }
2064: last if ($connection->aborted());
2065: # Finished looping through the servers
2066: $starttime = time if (@Servers_to_contact);
2067: $time_remaining = $max_time - (time - $starttime) ;
2068: if ($last_time - $time_remaining > 0) {
2069: $last_time = $time_remaining;
2070: &update_seconds($r,$time_remaining);
2071: }
2072: }
2073: &update_status($r,'Search Complete'.$server);
2074: &update_seconds($r,0);
2075: &Apache::lonmysql::disconnect_from_db();
2076: # We have run out of time or run out of servers to talk to and
2077: # results to get.
2078: $r->print("</body></html>");
2079: if ($ENV{'form.catalogmode'} ne 'groupsearch') {
2080: $r->print("<script>".
2081: "window.location='/adm/searchcat?".
2082: "phase=sort&".
2083: "persistent_db_id=$ENV{'form.persistent_db_id'}';".
2084: "</script>");
2085: }
2086: return;
2087: }
2088:
2089: ######################################################################
2090: ######################################################################
2091: =pod
2092:
2093: =item &prev_next_buttons
2094:
2095: =cut
2096:
2097: ######################################################################
2098: ######################################################################
2099: sub prev_next_buttons {
2100: my ($current_min,$show,$total,$parms) = @_;
2101: return '' if ($show eq 'all'); # No links if you get them all at once.
2102: my $links;
2103: ##
2104: ## Prev
2105: my $prev_min = $current_min - $show;
2106: $prev_min = 1 if $prev_min < 1;
2107: if ($prev_min < $current_min) {
2108: $links .= qq{
2109: <a href="/adm/searchcat?$parms&start=$prev_min&show=$show">prev</a>
2110: };
2111: } else {
2112: $links .= 'prev';
2113: }
2114: ##
2115: ## Pages.... Someday.
2116: ##
2117: $links .= qq{
2118: <a href="/adm/searchcat?$parms&start=$current_min&$show=$show">reload</a>
2119: };
2120: ##
2121: ## Next
2122: my $next_min = $current_min + $show;
2123: $next_min = $current_min if ($next_min > $total);
2124: if ($next_min != $current_min) {
2125: $links .= qq{
2126: <a href="/adm/searchcat?$parms&start=$next_min&show=$show">next</a>
2127: };
2128: } else {
2129: $links .= ' next';
2130: }
2131: return $links;
2132: }
2133: ######################################################################
2134: ######################################################################
2135:
2136: =pod
2137:
2138: =item &display_results
2139:
2140: =cut
2141:
2142: ######################################################################
2143: ######################################################################
2144: sub display_results {
2145: my ($r,$importbutton,$closebutton) = @_;
2146: my $connection = $r->connection;
2147: $r->print(&search_results_header($importbutton,$closebutton));
2148: ##
2149: ## Set viewing function
2150: ##
2151: my $viewfunction = $Views{$ENV{'form.viewselect'}};
2152: if (!defined($viewfunction)) {
2153: $r->print("Internal Error - Bad view selected.\n");
2154: $r->rflush();
2155: return;
2156: }
2157: ##
2158: ## $checkbox_num is a count of the number of checkboxes output on the
2159: ## page this is used only during catalogmode=groupsearch.
2160: my $checkbox_num = 0;
2161: ##
2162: ## Get the catalog controls setup
2163: ##
2164: my $action = "/adm/searchcat?phase=results";
2165: ##
2166: ## Deal with groupsearch
2167: ##
2168: if ($ENV{'form.catalogmode'} eq 'groupsearch') {
2169: if (! tie(%groupsearch_db,'GDBM_File',$diropendb,
2170: &GDBM_WRCREAT(),0640)) {
2171: $r->print('Unable to store import results.</form></body></html>');
2172: $r->rflush();
2173: return;
2174: }
2175: }
2176: ##
2177: ## Prepare the table for querying
2178: ##
2179: my $table = $ENV{'form.table'};
2180: return if (! &ensure_db_and_table($r,$table));
2181: ##
2182: ## Get the number of results
2183: ##
2184: my $total_results = &Apache::lonmysql::number_of_rows($table);
2185: if (! defined($total_results)) {
2186: $r->print("A MySQL error has occurred.</form></body></html>");
2187: &Apache::lonnet::logthis("lonmysql was unable to determine the number".
2188: " of rows in table ".$table);
2189: &Apache::lonnet::logthis(&Apache::lonmysql::get_error());
2190: return;
2191: }
2192: ##
2193: ## Determine how many results we need to get
2194: ##
2195: $ENV{'form.start'} = 1 if (! exists($ENV{'form.start'}));
2196: $ENV{'form.show'} = 'all' if (! exists($ENV{'form.show'}));
2197: my $min = $ENV{'form.start'};
2198: my $max;
2199: if ($ENV{'form.show'} eq 'all') {
2200: $max = $total_results ;
2201: } else {
2202: $max = $min + $ENV{'form.show'} - 1;
2203: $max = $total_results if ($max > $total_results);
2204: }
2205: ##
2206: ## Output links (if necessary) for 'prev' and 'next' pages.
2207: ##
2208: $r->print
2209: ('<center>'.
2210: &prev_next_buttons($min,$ENV{'form.show'},$total_results,
2211: "table=".$ENV{'form.table'}.
2212: "&phase=results".
2213: "&persistent_db_id=".$ENV{'form.persistent_db_id'})
2214: ."</center>\n"
2215: );
2216: if ($total_results == 0) {
2217: $r->print("There are currently no results.\n".
2218: "</form></body></html>");
2219: return;
2220: } else {
2221: $r->print
2222: ("<center>Results $min to $max out of $total_results</center>\n");
2223: }
2224: ##
2225: ## Get results from MySQL table
2226: ##
2227: my @Results = &Apache::lonmysql::get_rows($table,
2228: 'id>='.$min.' AND id<='.$max);
2229: ##
2230: ## Loop through the results and output them.
2231: ##
2232: foreach my $row (@Results) {
2233: if ($connection->aborted()) {
2234: untie %groupsearch_db if (tied(%groupsearch_db));
2235: &Apache::lonmysql::disconnect_from_db();
2236: return;
2237: }
2238: my %Fields = %{&parse_row(@$row)};
2239: my $output="<p>\n";
2240: my $prefix=&catalogmode_output($Fields{'title'},$Fields{'url'},
2241: $Fields{'id'},$checkbox_num++);
2242: # Render the result into html
2243: $output.= &$viewfunction($prefix,%Fields);
2244: # Print them out as they come in.
2245: $r->print($output);
2246: $r->rflush();
2247: }
2248: if (@Results < 1) {
2249: $r->print("There were no results matching your query");
2250: } else {
2251: $r->print
2252: ('<center>'.
2253: &prev_next_buttons($min,$ENV{'form.show'},$total_results,
2254: "table=".$ENV{'form.table'}.
2255: "&phase=results".
2256: "&persistent_db_id=".
2257: $ENV{'form.persistent_db_id'})
2258: ."</center>\n"
2259: );
2260: }
2261: $r->print("</form></body></html>");
2262: $r->rflush();
2263: untie %groupsearch_db if (tied(%groupsearch_db));
2264: return;
2265: }
2266:
2267: ######################################################################
2268: ######################################################################
2269:
2270: =pod
2271:
2272: =item &catalogmode_output($title,$url,$fnum,$checkbox_num)
2273:
2274: Returns html needed for the various catalog modes. Gets inputs from
2275: $ENV{'form.catalogmode'}. Stores data in %groupsearch_db.
2276:
2277: =cut
2278:
2279: ######################################################################
2280: ######################################################################
2281: sub catalogmode_output {
2282: my $output = '';
2283: my ($title,$url,$fnum,$checkbox_num) = @_;
2284: if ($ENV{'form.catalogmode'} eq 'interactive') {
2285: $title=~ s/\'/\\\'/g;
2286: if ($ENV{'form.catalogmode'} eq 'interactive') {
2287: $output.=<<END
2288: <font size='-1'><INPUT TYPE="button" NAME="returnvalues" VALUE="SELECT"
2289: onClick="javascript:select_data('$title','$url')">
2290: </font>
2291: END
2292: }
2293: } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') {
2294: $groupsearch_db{"pre_${fnum}_link"}=$url;
2295: $groupsearch_db{"pre_${fnum}_title"}=$title;
2296: $output.=<<END;
2297: <font size='-1'>
2298: <input type="checkbox" name="returnvalues" value="SELECT"
2299: onClick="javascript:queue($checkbox_num,$fnum)" />
2300: </font>
2301: END
2302: }
2303: return $output;
2304: }
2305: ######################################################################
2306: ######################################################################
2307:
2308: =pod
2309:
2310: =item &parse_row
2311:
2312: Parse a row returned from the database.
2313:
2314: =cut
2315:
2316: ######################################################################
2317: ######################################################################
2318: sub parse_row {
2319: my @Row = @_;
2320: my %Fields;
2321: for (my $i=0;$i<=$#Row;$i++) {
2322: $Fields{$DataOrder[$i]}=&Apache::lonnet::unescape($Row[$i]);
2323: }
2324: $Fields{'language'} =
2325: &Apache::loncommon::languagedescription($Fields{'lang'});
2326: $Fields{'copyrighttag'} =
2327: &Apache::loncommon::copyrightdescription($Fields{'copyright'});
2328: $Fields{'mimetag'} =
2329: &Apache::loncommon::filedescription($Fields{'mime'});
2330: return \%Fields;
2331: }
2332:
2333: ###########################################################
2334: ###########################################################
2335:
2336: =pod
2337:
2338: =item &parse_raw_result()
2339:
2340: Takes a line from the file of results and parse it. Returns a hash
2341: with keys for the following fields:
2342: 'title', 'author', 'subject', 'url', 'keywords', 'version', 'notes',
2343: 'abstract', 'mime', 'lang', 'owner', 'copyright', 'creationdate',
2344: 'lastrevisiondate'.
2345:
2346: In addition, the following tags are set by calling the appropriate
2347: lonnet function: 'language', 'cprtag', 'mimetag'.
2348:
2349: The 'title' field is set to "Untitled" if the title field is blank.
2350:
2351: 'abstract' and 'keywords' are truncated to 200 characters.
2352:
2353: =cut
2354:
2355: ###########################################################
2356: ###########################################################
2357: sub parse_raw_result {
2358: my ($result,$hostname) = @_;
2359: # Check for a comma - if it is there then we do not need to unescape the
2360: # string. There seems to be some kind of problem with some items in
2361: # the database - the entire string gets sent out unescaped...?
2362: unless ($result =~ /,/) {
2363: $result = &Apache::lonnet::unescape($result);
2364: }
2365: my @fields=map {
2366: &Apache::lonnet::unescape($_);
2367: } (split(/\,/,$result));
2368: my ($title,$author,$subject,$url,$keywords,$version,
2369: $notes,$abstract,$mime,$lang,
2370: $creationdate,$lastrevisiondate,$owner,$copyright)=@fields;
2371: my %Fields =
2372: ( title => &Apache::lonnet::unescape($title),
2373: author => &Apache::lonnet::unescape($author),
2374: subject => &Apache::lonnet::unescape($subject),
2375: url => &Apache::lonnet::unescape($url),
2376: keywords => &Apache::lonnet::unescape($keywords),
2377: version => &Apache::lonnet::unescape($version),
2378: notes => &Apache::lonnet::unescape($notes),
2379: abstract => &Apache::lonnet::unescape($abstract),
2380: mime => &Apache::lonnet::unescape($mime),
2381: lang => &Apache::lonnet::unescape($lang),
2382: owner => &Apache::lonnet::unescape($owner),
2383: copyright => &Apache::lonnet::unescape($copyright),
2384: creationdate => &Apache::lonnet::unescape($creationdate),
2385: lastrevisiondate => &Apache::lonnet::unescape($lastrevisiondate)
2386: );
2387: $Fields{'language'} =
2388: &Apache::loncommon::languagedescription($Fields{'lang'});
2389: $Fields{'copyrighttag'} =
2390: &Apache::loncommon::copyrightdescription($Fields{'copyright'});
2391: $Fields{'mimetag'} =
2392: &Apache::loncommon::filedescription($Fields{'mime'});
2393: if ($Fields{'author'}=~/^(\s*|error)$/) {
2394: $Fields{'author'}="Unknown Author";
2395: }
2396: # Put spaces in the keyword list, if needed.
2397: $Fields{'keywords'}=~ s/,([A-z])/, $1/g;
2398: if ($Fields{'title'}=~ /^\s*$/ ) {
2399: $Fields{'title'}='Untitled';
2400: }
2401: unless ($ENV{'user.adv'}) {
2402: # What is this anyway?
2403: $Fields{'keywords'} = '- not displayed -';
2404: $Fields{'notes'} = '- not displayed -';
2405: $Fields{'abstract'} = '- not displayed -';
2406: $Fields{'subject'} = '- not displayed -';
2407: }
2408: if (length($Fields{'abstract'})>200) {
2409: $Fields{'abstract'} =
2410: substr($Fields{'abstract'},0,200).'...';
2411: }
2412: if (length($Fields{'keywords'})>200) {
2413: $Fields{'keywords'} =
2414: substr($Fields{'keywords'},0,200).'...';
2415: }
2416: return %Fields;
2417: }
2418:
2419: ###########################################################
2420: ###########################################################
2421:
2422: =pod
2423:
2424: =item &handle_custom_fields()
2425:
2426: =cut
2427:
2428: ###########################################################
2429: ###########################################################
2430: sub handle_custom_fields {
2431: my @results = @{shift()};
2432: my $customshow='';
2433: my $extrashow='';
2434: my @customfields;
2435: if ($ENV{'form.customshow'}) {
2436: $customshow=$ENV{'form.customshow'};
2437: $customshow=~s/[^\w\s]//g;
2438: my @fields=map {
2439: "<font color=\"#008000\">$_:</font><!-- $_ -->";
2440: } split(/\s+/,$customshow);
2441: @customfields=split(/\s+/,$customshow);
2442: if ($customshow) {
2443: $extrashow="<ul><li>".join("</li><li>",@fields)."</li></ul>\n";
2444: }
2445: }
2446: my $customdata='';
2447: my %customhash;
2448: foreach my $result (@results) {
2449: if ($result=~/^(custom\=.*)$/) { # grab all custom metadata
2450: my $tmp=$result;
2451: $tmp=~s/^custom\=//;
2452: my ($k,$v)=map {&Apache::lonnet::unescape($_);
2453: } split(/\,/,$tmp);
2454: $customhash{$k}=$v;
2455: }
2456: }
2457: return ($extrashow,\@customfields,\%customhash);
2458: }
2459:
2460: ######################################################################
2461: ######################################################################
2462:
2463: =pod
2464:
2465: =item &search_results_header
2466:
2467: Output the proper html headers and javascript code to deal with different
2468: calling modes.
2469:
2470: Takes most inputs directly from %ENV, except $mode.
2471:
2472: =over 4
2473:
2474: =item $mode is either (at this writing) 'Basic' or 'Advanced'
2475:
2476: =back
2477:
2478: The following environment variables are checked:
2479:
2480: =over 4
2481:
2482: =item 'form.catalogmode'
2483:
2484: Checked for 'interactive' and 'groupsearch'.
2485:
2486: =item 'form.mode'
2487:
2488: Checked for existance & 'edit' mode.
2489:
2490: =item 'form.form'
2491:
2492: =item 'form.element'
2493:
2494: =back
2495:
2496: =cut
2497:
2498: ######################################################################
2499: ######################################################################
2500: sub search_results_header {
2501: my ($importbutton,$closebutton) = @_;
2502: my $result = '';
2503: # output beginning of search page
2504: # conditional output of script functions dependent on the mode in
2505: # which the search was invoked
2506: if ($ENV{'form.catalogmode'} eq 'interactive'){
2507: if (! exists($ENV{'form.mode'}) || $ENV{'form.mode'} ne 'edit') {
2508: $result.=<<SCRIPT;
2509: <script type="text/javascript">
2510: function select_data(title,url) {
2511: changeTitle(title);
2512: changeURL(url);
2513: parent.close();
2514: }
2515: function changeTitle(val) {
2516: if (parent.opener.inf.document.forms.resinfo.elements.t) {
2517: parent.opener.inf.document.forms.resinfo.elements.t.value=val;
2518: }
2519: }
2520: function changeURL(val) {
2521: if (parent.opener.inf.document.forms.resinfo.elements.u) {
2522: parent.opener.inf.document.forms.resinfo.elements.u.value=val;
2523: }
2524: }
2525: </script>
2526: SCRIPT
2527: } elsif ($ENV{'form.mode'} eq 'edit') {
2528: my $form = $ENV{'form.form'};
2529: my $element = $ENV{'form.element'};
2530: $result.=<<SCRIPT;
2531: <script type="text/javascript">
2532: function select_data(title,url) {
2533: changeURL(url);
2534: parent.close();
2535: }
2536: function changeTitle(val) {
2537: }
2538: function changeURL(val) {
2539: if (parent.targetwin.document) {
2540: parent.targetwin.document.forms["$form"].elements["$element"].value=val;
2541: } else {
2542: var url = 'forms[\"$form\"].elements[\"$element\"].value';
2543: alert("Unable to transfer data to "+url);
2544: }
2545: }
2546: </script>
2547: SCRIPT
2548: }
2549: }
2550: $result.=<<SCRIPT if $ENV{'form.catalogmode'} eq 'groupsearch';
2551: <script type="text/javascript">
2552: function queue(checkbox_num,val) {
2553: if (document.forms.results.returnvalues[checkbox_num].checked) {
2554: parent.statusframe.document.forms.statusform.elements.Queue.value +='1a'+val+'b';
2555: } else {
2556: parent.statusframe.document.forms.statusform.elements.Queue.value +='0a'+val+'b';
2557: }
2558: }
2559: function select_group() {
2560: parent.window.location=
2561: "/adm/groupsort?mode=$ENV{'form.mode'}&catalogmode=groupsearch&acts="+
2562: parent.statusframe.document.forms.statusform.elements.Queue.value;
2563: }
2564: </script>
2565: SCRIPT
2566: $result.=<<END;
2567: </head>
2568: $bodytag
2569: <form name="results" method="post" action="" >
2570: <input type="hidden" name="Queue" value="" />
2571: $importbutton
2572: END
2573: return $result;
2574: }
2575:
2576: ######################################################################
2577: ######################################################################
2578: sub search_status_header {
2579: return <<ENDSTATUS;
2580: <html><head><title>Search Status</title></head>
2581: $bodytag
2582: <h3>Search Status</h3>
2583: Sending search request to LON-CAPA servers.<br />
2584: ENDSTATUS
2585: }
2586:
2587: sub results_link {
2588: my $basic_link = "/adm/searchcat?"."&table=".$ENV{'form.table'}.
2589: "&persistent_db_id=".$ENV{'form.persistent_db_id'};
2590: my $results_link = $basic_link."&phase=results".
2591: "&pause=1"."&start=1";
2592: return $results_link;
2593: }
2594:
2595: ######################################################################
2596: ######################################################################
2597: sub print_frames_interface {
2598: my $r = shift;
2599: my $basic_link = "/adm/searchcat?"."&table=".$ENV{'form.table'}.
2600: "&persistent_db_id=".$ENV{'form.persistent_db_id'};
2601: my $run_search_link = $basic_link."&phase=run_search";
2602: my $results_link = &results_link();
2603: my $result = <<"ENDFRAMES";
2604: <html>
2605: <head>
2606: <script>
2607: var targetwin = opener;
2608: var queue = '';
2609: </script>
2610: <title>LON-CAPA Digital Library Search Results</title>
2611: </head>
2612: <frameset rows="150,*">
2613: <frame name="statusframe" src="$run_search_link">
2614: <frame name="resultsframe" src="$results_link">
2615: </frameset>
2616: </html>
2617: ENDFRAMES
2618:
2619: $r->print($result);
2620: return;
2621: }
2622:
2623: ######################################################################
2624: ######################################################################
2625:
2626: =pod
2627:
2628: =item Metadata Viewing Functions
2629:
2630: Output is a HTML-ified string.
2631: Input arguments are title, author, subject, url, keywords, version,
2632: notes, short abstract, mime, language, creation date,
2633: last revision date, owner, copyright, hostname, and
2634: extra custom metadata to show.
2635:
2636: =over 4
2637:
2638: =item &detailed_citation_view()
2639:
2640: =cut
2641:
2642: ######################################################################
2643: ######################################################################
2644: sub detailed_citation_view {
2645: my ($prefix,%values) = @_;
2646: my $result=<<END;
2647: <b>$prefix<a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2648: target='search_preview'>$values{'title'}</a></b>
2649: <p>
2650: <b>$values{'author'}</b>, <i>$values{'owner'}</i><br />
2651:
2652: <b>Subject: </b> $values{'subject'}<br />
2653: <b>Keyword(s): </b> $values{'keywords'}<br />
2654: <b>Notes: </b> $values{'notes'}<br />
2655: <b>MIME Type: </b> $values{'mimetag'}<br />
2656: <b>Language: </b> $values{'language'}<br />
2657: <b>Copyright/Distribution:</b> $values{'cprtag'}<br />
2658: </p>
2659: $values{'extrashow'}
2660: <p>
2661: $values{'shortabstract'}
2662: </p>
2663: <hr align='left' width='200' noshade />
2664: END
2665: return $result;
2666: }
2667:
2668: ######################################################################
2669: ######################################################################
2670:
2671: =pod
2672:
2673: =item &summary_view()
2674:
2675: =cut
2676: ######################################################################
2677: ######################################################################
2678: sub summary_view {
2679: my ($prefix,%values) = @_;
2680: my $result=<<END;
2681: $prefix<a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2682: target='search_preview'>$values{'author'}</a><br />
2683: $values{'title'}<br />
2684: $values{'owner'} -- $values{'lastrevisiondate'}<br />
2685: $values{'copyrighttag'}<br />
2686: $values{'extrashow'}
2687: </p>
2688: <hr align='left' width='200' noshade />
2689: END
2690: return $result;
2691: }
2692:
2693: ######################################################################
2694: ######################################################################
2695:
2696: =pod
2697:
2698: =item &compact_view()
2699:
2700: =cut
2701:
2702: ######################################################################
2703: ######################################################################
2704: sub compact_view {
2705: my ($prefix,%values) = @_;
2706: my $result=<<END;
2707: $prefix <a href="http://$ENV{'HTTP_HOST'}$values{'url'}" target='search_preview'>
2708: $values{'title'}</a>
2709: <b>$values{'author'}</b><br />
2710: END
2711: return $result;
2712: }
2713:
2714:
2715: ######################################################################
2716: ######################################################################
2717:
2718: =pod
2719:
2720: =item &fielded_format_view()
2721:
2722: =cut
2723:
2724: ######################################################################
2725: ######################################################################
2726: sub fielded_format_view {
2727: my ($prefix,%values) = @_;
2728: my $result=<<END;
2729: $prefix
2730: <b>URL: </b> <a href="http://$ENV{'HTTP_HOST'}$values{'url'}"
2731: target='search_preview'>$values{'url'}</a>
2732: <br />
2733: <b>Title:</b> $values{'title'}<br />
2734: <b>Author(s):</b> $values{'author'}<br />
2735: <b>Subject:</b> $values{'subject'}<br />
2736: <b>Keyword(s):</b> $values{'keywords'}<br />
2737: <b>Notes:</b> $values{'notes'}<br />
2738: <b>MIME Type:</b> $values{'mimetag'}<br />
2739: <b>Language:</b> $values{'language'}<br />
2740: <b>Creation Date:</b> $values{'creationdate'}<br />
2741: <b>Last Revision Date:</b> $values{'lastrevisiondate'}<br />
2742: <b>Publisher/Owner:</b> $values{'owner'}<br />
2743: <b>Copyright/Distribution:</b> $values{'copyrighttag'}<br />
2744: <b>Repository Location:</b> $values{'hostname'}<br />
2745: <b>Abstract:</b> $values{'shortabstract'}<br />
2746: $values{'extrashow'}
2747: </p>
2748: <hr align='left' width='200' noshade />
2749: END
2750: return $result;
2751: }
2752:
2753: ######################################################################
2754: ######################################################################
2755:
2756: =pod
2757:
2758: =item &xml_sgml_view()
2759:
2760: =back
2761:
2762: =cut
2763:
2764: ######################################################################
2765: ######################################################################
2766: sub xml_sgml_view {
2767: my ($prefix,%values) = @_;
2768: my $result=<<END;
2769: $prefix
2770: <pre>
2771: <LonCapaResource>
2772: <url>$values{'url'}</url>
2773: <title>$values{'title'}</title>
2774: <author>$values{'author'}</author>
2775: <subject>$values{'subject'}</subject>
2776: <keywords>$values{'keywords'}</keywords>
2777: <notes>$values{'notes'}</notes>
2778: <mimeInfo>
2779: <mime>$values{'mime'}</mime>
2780: <mimetag>$values{'mimetag'}</mimetag>
2781: </mimeInfo>
2782: <languageInfo>
2783: <language>$values{'lang'}</language>
2784: <languagetag>$values{'language'}</languagetag>
2785: </languageInfo>
2786: <creationdate>$values{'creationdate'}</creationdate>
2787: <lastrevisiondate>$values{'lastrevisiondate'}</lastrevisiondate>
2788: <owner>$values{'owner'}</owner>
2789: <copyrightInfo>
2790: <copyright>$values{'copyright'}</copyright>
2791: <copyrighttag>$values{'copyrighttag'}</copyrighttag>
2792: </copyrightInfo>
2793: <repositoryLocation>$values{'hostname'}</repositoryLocation>
2794: <shortabstract>$values{'shortabstract'}</shortabstract>
2795: </LonCapaResource>
2796: </pre>
2797: $values{'extrashow'}
2798: <hr align='left' width='200' noshade />
2799: END
2800: return $result;
2801: }
2802:
2803: ######################################################################
2804: ######################################################################
2805:
2806: =pod
2807:
2808: =item &filled() see if field is filled.
2809:
2810: =cut
2811:
2812: ######################################################################
2813: ######################################################################
2814: sub filled {
2815: my ($field)=@_;
2816: if ($field=~/\S/ && $field ne 'any') {
2817: return 1;
2818: }
2819: else {
2820: return 0;
2821: }
2822: }
2823:
2824: ######################################################################
2825: ######################################################################
2826:
2827: =pod
2828:
2829: =item &output_blank_field_error()
2830:
2831: Output a complete page that indicates the user has not filled in enough
2832: information to do a search.
2833:
2834: Inputs: $r (Apache request handle), $closebutton, $parms.
2835:
2836: Returns: nothing
2837:
2838: $parms is extra information to include in the 'Revise search request' link.
2839:
2840: =cut
2841:
2842: ######################################################################
2843: ######################################################################
2844: sub output_blank_field_error {
2845: my ($r,$closebutton,$parms)=@_;
2846: # make query information persistent to allow for subsequent revision
2847: $r->print(<<BEGINNING);
2848: <html>
2849: <head>
2850: <title>The LearningOnline Network with CAPA</title>
2851: BEGINNING
2852: $r->print(<<RESULTS);
2853: </head>
2854: $bodytag
2855: <img align='right' src='/adm/lonIcons/lonlogos.gif' />
2856: <h1>Search Catalog</h1>
2857: <form method="post" action="/adm/searchcat">
2858: $hidden_fields
2859: <a href="/adm/searchcat?$parms&persistent_db_id=$ENV{'form.persistent_db_id'}"
2860: >Revise search request</a>
2861: $closebutton
2862: <hr />
2863: <h3>Unactionable search query.</h3>
2864: <p>
2865: You did not fill in enough information for the search to be started.
2866: You need to fill in relevant fields on the search page in order
2867: for a query to be processed.
2868: </p>
2869: </body>
2870: </html>
2871: RESULTS
2872: }
2873:
2874: ######################################################################
2875: ######################################################################
2876:
2877: =pod
2878:
2879: =item &output_date_error()
2880:
2881: Output a full html page with an error message.
2882:
2883: Inputs:
2884:
2885: $r, the request pointer.
2886: $message, the error message for the user.
2887: $closebutton, the specialized close button needed for groupsearch.
2888:
2889: =cut
2890:
2891: ######################################################################
2892: ######################################################################
2893: sub output_date_error {
2894: my ($r,$message,$closebutton)=@_;
2895: # make query information persistent to allow for subsequent revision
2896: $r->print(<<RESULTS);
2897: <html>
2898: <head>
2899: <title>The LearningOnline Network with CAPA</title>
2900: </head>
2901: $bodytag
2902: <img align='right' src='/adm/lonIcons/lonlogos.gif' />
2903: <h1>Search Catalog</h1>
2904: <form method="post" action="/adm/searchcat">
2905: $hidden_fields
2906: <input type='button' value='Revise search request'
2907: onClick='this.form.submit();' />
2908: $closebutton
2909: <hr />
2910: <h3>Error</h3>
2911: <p>
2912: $message
2913: </p>
2914: </body>
2915: </html>
2916: RESULTS
2917: }
2918:
2919: ######################################################################
2920: ######################################################################
2921:
2922: =pod
2923:
2924: =item &start_fresh_session()
2925:
2926: Cleans the global %groupsearch_db by removing all fields which begin with
2927: 'pre_' or 'store'.
2928:
2929: =cut
2930:
2931: ######################################################################
2932: ######################################################################
2933: sub start_fresh_session {
2934: delete $groupsearch_db{'mode_catalog'};
2935: foreach (keys %groupsearch_db) {
2936: if ($_ =~ /^pre_/) {
2937: delete $groupsearch_db{$_};
2938: }
2939: if ($_ =~ /^store/) {
2940: delete $groupsearch_db{$_};
2941: }
2942: }
2943: }
2944:
2945: 1;
2946:
2947: __END__
2948:
2949: =pod
2950:
2951: =back
2952:
2953: =cut
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