1: # The LearningOnline Network with CAPA
2: # Search Course
3: #
4: # $Id: lonsearchcourse.pm,v 1.2 2011/01/17 20:43:09 www Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###############################################################################
29: ###############################################################################
30:
31: package Apache::lonsearchcourse;
32:
33: use strict;
34: use Apache::Constants qw(:common :http);
35: use Apache::lonnet;
36: use GDBM_File;
37: use Apache::loncommon();
38: use Apache::lonmeta;
39: use Apache::lonhtmlcommon;
40: use Apache::lonlocal;
41: use LONCAPA::lonmetadata();
42: use HTML::Entities();
43: use Apache::lonnavmaps;
44: use Apache::londocs();
45: use Apache::lonindexer();
46: use LONCAPA;
47:
48: # Variables For course search
49: my %alreadyseen;
50: my %hash;
51: my $totalfound;
52:
53:
54: sub menu {
55: my $scrout='';
56: if ($env{'request.course.id'}) {
57: my %lt=&Apache::lonlocal::texthash('srch' => 'Search',
58: 'header' => 'Course Search',
59: 'note' => 'Enter terms or phrases, then press "Search" below',
60: 'use' => 'use related words',
61: 'full' =>'fulltext search (time consuming)',
62: 'disc' => 'search discussion postings (resources and discussion boards)',
63: );
64: $scrout.=(<<ENDCOURSESEARCH);
65: <form name="loncapa_search" method="post" action="/adm/searchcourse">
66: <center>
67: <hr />
68: <h1>$lt{'header'}</h1>
69: <input type="hidden" name="phase" value="results" />
70: <p>
71: $lt{'note'}.
72: </p>
73: <table>
74: <tr><td>
75: ENDCOURSESEARCH
76: $scrout.=' '.
77: &Apache::lonhtmlcommon::textbox('courseexp',
78: $env{'form.courseexp'},40);
79: my $crscheckbox =
80: &Apache::lonhtmlcommon::checkbox('crsfulltext',
81: $env{'form.crsfulltext'});
82: my $relcheckbox =
83: &Apache::lonhtmlcommon::checkbox('crsrelated',
84: $env{'form.crsrelated'});
85: my $discheckbox =
86: &Apache::lonhtmlcommon::checkbox('crsdiscuss',
87: $env{'form.crsrelated'});
88: $scrout.=(<<ENDENDCOURSE);
89: </td></tr>
90: <tr><td><label>$relcheckbox $lt{'use'}</label></td><td></td></tr>
91: <tr><td><label>$crscheckbox $lt{'full'}</label></td><td></td></tr>
92: <tr><td><label>$discheckbox $lt{'disc'}</label></td><td></td></tr>
93: </table>
94: <p>
95: <input type="submit" name="coursesubmit" value='$lt{'srch'}' />
96: </p>
97: </center>
98: </form>
99: ENDENDCOURSE
100: }
101: return $scrout;
102: }
103:
104: sub make_symb {
105: my ($id)=@_;
106: my ($mapid,$resid)=split(/\./,$id);
107: my $map=$hash{'map_id_'.$mapid};
108: my $res=$hash{'src_'.$id};
109: my $symb=&Apache::lonnet::encode_symb($map,$resid,$res);
110: return $symb;
111: }
112:
113: sub related_version {
114: my ($word) = @_;
115: return (undef) if (lc($word) =~ /\b(or|and|not)\b/);
116: my @Words = &Apache::loncommon::get_related_words($word);
117: # Only use 4 related words
118: @Words = ($#Words>4? @Words[0..4] : @Words);
119: my $result = join " OR ", ($word,@Words);
120: return $result,sort(@Words);
121: }
122:
123: sub course_search {
124: my $r=shift;
125: my $pretty_search_string = '<b>'.$env{'form.courseexp'}.'</b>';
126: my $search_string = $env{'form.courseexp'};
127: my @New_Words;
128: undef(%alreadyseen);
129: if ($env{'form.crsrelated'}) {
130: ($search_string,@New_Words) = &related_version($env{'form.courseexp'});
131: if (@New_Words) {
132: $pretty_search_string .= ' '.&mt("with related words").": <b>@New_Words</b>.";
133: } else {
134: $pretty_search_string .= ' '.&mt('with no related words').".";
135: }
136: }
137: my $fulltext=$env{'form.crsfulltext'};
138: my $discuss=$env{'form.crsdiscuss'};
139: my @allwords=($search_string,@New_Words);
140: $totalfound=0;
141:
142: $r->print(
143: '<hr /><center><font size="+2" face="arial">'.
144: $pretty_search_string.'</font></center>'.
145: '<hr /><b>'.&mt('Course content').':</b><br />');
146: $r->rflush();
147: # ======================================================= Go through the course
148: my $c=$r->connection;
149: if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.".db",
150: &GDBM_READER(),0640)) {
151: foreach (sort(keys(%hash))) {
152: if ($c->aborted()) { last; }
153: if (($_=~/^src\_(.+)$/)) {
154: if ($hash{'randomout_'.$1} & !$env{'request.role.adv'}) {
155: next;
156: }
157: my $symb=&make_symb($1);
158: &checkonthis($r,$1,$hash{$_},0,&Apache::lonnet::gettitle($symb),
159: $fulltext,$symb,@allwords);
160: }
161: }
162: untie(%hash);
163: }
164: unless ($totalfound) {
165: $r->print('<p class="LC_info">'.&mt('No matches found in resources.').'</p>');
166: }
167:
168: # Check discussions if requested
169: if ($discuss) {
170: my $totaldiscussions = 0;
171: $r->print('<br /><br /><b>'.&mt('Discussion postings').':</b><br />');
172: my $navmap = Apache::lonnavmaps::navmap->new();
173: if (defined($navmap)) {
174: my @allres=$navmap->retrieveResources();
175: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
176: $env{'course.'.$env{'request.course.id'}.'.domain'},
177: $env{'course.'.$env{'request.course.id'}.'.num'});
178: foreach my $resource (@allres) {
179: my $result = '';
180: my $applies = 0;
181: my $symb = $resource->symb();
182: my $ressymb = $symb;
183: if ($symb =~ m#(___adm/$LONCAPA::domain_re/$LONCAPA::username_re)/(\d+)/bulletinboard$#) {
184: $ressymb = 'bulletin___'.$2.$1.'/'.$2.'/bulletinboard';
185: unless ($ressymb =~ m#bulletin___\d+___adm/wrapper#) {
186: $ressymb=~s#(bulletin___\d+___)#$1adm/wrapper/#;
187: }
188: }
189: if (defined($discussiontime{$ressymb})) {
190: my %contrib = &Apache::lonnet::restore($ressymb,$env{'request.course.id'},
191: $env{'course.'.$env{'request.course.id'}.'.domain'},
192: $env{'course.'.$env{'request.course.id'}.'.num'});
193: if ($contrib{'version'}) {
194: for (my $id=1;$id<=$contrib{'version'};$id++) {
195: unless (($contrib{'hidden'}=~/\.$id\./) || ($contrib{'deleted'}=~/\.$id\./)) {
196: if ($contrib{$id.':subject'}) {
197: $result .= $contrib{$id.':subject'};
198: }
199: if ($contrib{$id.':message'}) {
200: $result .= $contrib{$id.':message'};
201: }
202: if ($contrib{$id,':attachmenturl'}) {
203: if ($contrib{$id,':attachmenturl'} =~ m-/([^/]+)$-) {
204: $result .= $1;
205: }
206: }
207: $applies = &checkwords($result,$applies,@allwords);
208: }
209: }
210: }
211: }
212: # Does this discussion apply?
213: if ($applies) {
214: my ($map,$ind,$url)=&Apache::lonnet::decode_symb($ressymb);
215: my $disctype = &mt('resource');
216: if ($url =~ m#/bulletinboard$#) {
217: if ($url =~m#^adm/wrapper/adm/.*/bulletinboard$#) {
218: $url =~s#^adm/wrapper##;
219: }
220: $disctype = &mt('discussion board');
221: } else {
222: $url = '/res/'.$url;
223: }
224: if ($url =~ /\?/) {
225: $url .= '&symb=';
226: } else {
227: $url .= '?symb=';
228: }
229: $url .= &escape($resource->symb());
230: my $title = $resource->compTitle();
231: $r->print('<br /><a href="'.$url.'" target="cat">'.
232: ($title?$title:$url).'</a> - '.
233: $disctype.'<br />');
234: $totaldiscussions++;
235: } else {
236: $r->print(' .');
237: }
238: }
239: unless ($totaldiscussions) {
240: $r->print('<p class="LC_info">'.&mt('No matches found in postings.').'</p>');
241: }
242: } else {
243: $r->print('<div class="LC_error">'.&mt('An error occurred retrieving information about resources in the course.').'<br />'.&mt('It is recommended that you [_1]re-initialize the course[_2] and then try your search again.','<a href="/adm/roles">','</a>').'</div>');
244: }
245: }
246:
247: # =================================================== Done going through course
248: $r->print(&Apache::loncommon::end_page());
249: }
250:
251: # =============================== This pulls up a resource and its dependencies
252:
253: sub checkonthis {
254: my ($r,$id,$url,$level,$title,$fulltext,$symb,@allwords)=@_;
255: $alreadyseen{$id}=1;
256: if (&Apache::loncommon::connection_aborted($r)) { return; }
257: $r->rflush();
258:
259: my $result=$title.' ';
260: if ($env{'request.role.adv'} || !$hash{'encrypted_'.$id}) {
261: $result.=&Apache::lonnet::metadata($url,'title').' '.
262: &Apache::lonnet::metadata($url,'subject').' '.
263: &Apache::lonnet::metadata($url,'abstract').' '.
264: &Apache::lonnet::metadata($url,'keywords');
265: }
266: my ($extension)=($url=~/\.(\w+)$/);
267: if (&Apache::loncommon::fileembstyle($extension) eq 'ssi' &&
268: ($url) && ($fulltext)) {
269: $result.=&Apache::lonnet::ssi_body($url.'?symb='.&escape($symb));
270: }
271: $result=~s/\s+/ /gs;
272: my $applies = 0;
273: $applies = &checkwords($result,$applies,@allwords);
274: # Does this resource apply?
275: if ($applies) {
276: $r->print('<br />');
277: for (my $i=0;$i<=$level*5;$i++) {
278: $r->print(' ');
279: }
280: my $href=$url;
281: if ($hash{'encrypted_'.$id} && !$env{'request.role.adv'}) {
282: $href=&Apache::lonenc::encrypted($href)
283: .'?symb='.&Apache::lonenc::encrypted($symb);
284: } else {
285: $href.='?symb='.&escape($symb);
286: }
287: $r->print('<a href="'.$href.'" target="cat">'.($title?$title:$url).
288: '</a><br />');
289: $totalfound++;
290: } elsif ($fulltext) {
291: $r->print(' .');
292: }
293: $r->rflush();
294: # Check also the dependencies of this one
295: my $dependencies=
296: &Apache::lonnet::metadata($url,'dependencies');
297: foreach (split(/\,/,$dependencies)) {
298: if (($_=~/^\/res\//) && (!$alreadyseen{$id})) {
299: &checkonthis($r,$id,$_,$level+1,'',$fulltext,undef,@allwords);
300: }
301: }
302: }
303:
304: sub checkwords {
305: my ($result,$applies,@allwords) = @_;
306: foreach (@allwords) {
307: if ($_=~/\w/) {
308: if ($result=~/$_/si) {
309: $applies++;
310: }
311: }
312: }
313: return $applies;
314: }
315:
316: sub untiehash {
317: if (tied(%hash)) {
318: untie(%hash);
319: }
320: }
321:
322: sub handler {
323: my $r = shift;
324: &Apache::loncommon::content_type($r,'text/html');
325: $r->send_http_header;
326: if ($r->header_only) { return OK; }
327:
328: my $crstype = &Apache::loncommon::course_type();
329: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['phase']);
330: $r->print(&Apache::loncommon::start_page("$crstype Search"));
331: &Apache::lonhtmlcommon::clear_breadcrumbs();
332: &Apache::lonhtmlcommon::add_breadcrumb(
333: { href => '/adm/searchcourse',
334: text => "$crstype Search"});
335: if ($env{'form.phase'} eq 'results') {
336: &Apache::lonhtmlcommon::add_breadcrumb(
337: { href => '/adm/searchcourse?phase=results',
338: text => 'Search Results'});
339: }
340: $r->print(&Apache::lonhtmlcommon::breadcrumbs("$crstype Search"));
341: &Apache::londocs::startContentScreen($r,'coursesearch');
342: if ($env{'form.phase'} eq 'results') {
343: &course_search($r);
344: } else {
345: $r->print(&menu());
346: }
347: &Apache::londocs::endContentScreen($r);
348: $r->print(&Apache::loncommon::end_page());
349: return OK;
350: }
351:
352: 1;
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