1: # The LearningOnline Network with CAPA
2: # The LON-CAPA Homework handler
3: #
4: # $Id: lonhomework.pm,v 1.89 2002/09/23 17:29:37 albertel 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: # Guy Albertelli
29: # 11/30 Gerd Kortemeyer
30: # 6/1,8/17,8/18 Gerd Kortemeyer
31: # 7/18 Jeremy Bowers
32:
33: package Apache::lonhomework;
34: use strict;
35: use Apache::style();
36: use Apache::lonxml();
37: use Apache::lonnet();
38: use Apache::lonplot();
39: use Apache::inputtags();
40: use Apache::structuretags();
41: use Apache::randomlabel();
42: use Apache::response();
43: use Apache::hint();
44: use Apache::outputtags();
45: use Apache::caparesponse();
46: use Apache::radiobuttonresponse();
47: use Apache::optionresponse();
48: use Apache::imageresponse();
49: use Apache::essayresponse();
50: use Apache::externalresponse();
51: use Apache::Constants qw(:common);
52: use HTML::Entities();
53: use Apache::loncommon();
54: #use Time::HiRes qw( gettimeofday tv_interval );
55:
56: BEGIN {
57: &Apache::lonxml::register_insert();
58: }
59:
60: sub get_target {
61: if ( $ENV{'request.state'} eq "published") {
62: if ( defined($ENV{'form.grade_target'})
63: && ($Apache::lonhomework::viewgrades == 'F' )) {
64: return ($ENV{'form.grade_target'});
65: }
66: if ( defined($ENV{'form.submitted'})) {
67: return ('grade', 'web');
68: } else {
69: return ('web');
70: }
71: } elsif ($ENV{'request.state'} eq "construct") {
72: if ( defined($ENV{'form.grade_target'}) ) {
73: return ($ENV{'form.grade_target'});
74: }
75: if ( defined($ENV{'form.preview'})) {
76: if ( defined($ENV{'form.submitted'})) {
77: return ('grade', 'web');
78: } else {
79: return ('web');
80: }
81: } else {
82: if ( $ENV{'form.problemmode'} eq 'View' ||
83: $ENV{'form.problemmode'} eq 'Discard Edits and View') {
84: if ( defined($ENV{'form.submitted'}) &&
85: (!defined($ENV{'form.resetdata'})) ) {
86: return ('grade', 'web','answer');
87: } else {
88: return ('web','answer');
89: }
90: } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
91: if ( $ENV{'form.submitted'} eq 'edit' ) {
92: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
93: return ('modified','web','answer');
94: } else {
95: return ('modified','edit');
96: }
97: } else {
98: return ('edit');
99: }
100: } else {
101: return ('web');
102: }
103: }
104: }
105: return ();
106: }
107:
108: sub setup_vars {
109: my ($target) = @_;
110: return ';'
111: # return ';$external::target='.$target.';';
112: }
113:
114: sub send_header {
115: my ($request)= @_;
116: $request->print(&Apache::lontexconvert::header());
117: # $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
118: }
119:
120: sub createmenu {
121: my ($which,$request)=@_;
122: if ($which eq 'grade') {
123: $request->print('<script language="JavaScript">
124: hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
125: "height=350,width=150,menubar=no");
126: </script>');
127: }
128: }
129:
130: sub send_footer {
131: my ($request)= @_;
132: # $request->print('</form>');
133: $request->print(&Apache::lontexconvert::footer());
134: }
135:
136: $Apache::lonxml::browse='';
137:
138: sub check_access {
139: my ($id) = @_;
140: my $date ='';
141: my $status = '';
142: my $datemsg = '';
143: my $lastdate = '';
144: my $temp;
145: my $type;
146: my $passed;
147: &Apache::lonxml::debug("checking for part :$id:");
148: &Apache::lonxml::debug("time:".time);
149: foreach $temp ("opendate","duedate","answerdate") {
150: $lastdate = $date;
151: $date = &Apache::lonnet::EXT("resource.$id.$temp");
152: my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
153: if ($thistype eq 'date_interval') {
154: if ($temp eq 'opendate') {
155: $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
156: }
157: if ($temp eq 'answerdate') {
158: $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
159: }
160: }
161: &Apache::lonxml::debug("found :$date: for :$temp:");
162: if ($date eq '') {
163: $date = "an unknown date"; $passed = 0;
164: } elsif ($date eq 'con_lost') {
165: $date = "an indeterminate date"; $passed = 0;
166: } else {
167: if (time < $date) { $passed = 0; } else { $passed = 1; }
168: $date = localtime $date;
169: }
170: if (!$passed) { $type=$temp; last; }
171: }
172: &Apache::lonxml::debug("have :$type:$passed:");
173: if ($passed) {
174: $status='SHOW_ANSWER';
175: $datemsg=$date;
176: } elsif ($type eq 'opendate') {
177: $status='CLOSED';
178: $datemsg = "will open on $date";
179: } elsif ($type eq 'duedate') {
180: $status='CAN_ANSWER';
181: $datemsg = "is due at $date";
182: } elsif ($type eq 'answerdate') {
183: $status='CLOSED';
184: $datemsg = "was due on $lastdate, and answers will be available on $date";
185: }
186: if ($status eq 'CAN_ANSWER') {
187: #check #tries
188: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
189: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
190: if ( $tries eq '' ) { $tries = '0'; }
191: if ( $maxtries eq '' ) { $maxtries = '2'; }
192: if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
193: }
194:
195: if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
196: (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
197: return ('UNCHECKEDOUT','needs to be checked out');
198: }
199:
200:
201: &Apache::lonxml::debug("sending back :$status:$datemsg:");
202: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
203: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
204: $status='CAN_ANSWER';
205: $datemsg='is closed but you are allowed to view it';
206: }
207: if ($ENV{'request.state'} eq "construct") {
208: &Apache::lonxml::debug("in construction ignoring dates");
209: $status='CAN_ANSWER';
210: $datemsg='is in under construction';
211: }
212: return ($status,$datemsg);
213: }
214:
215: sub showhash {
216: my (%hash) = @_;
217: &showhashsubset(\%hash,'');
218: return '';
219: }
220:
221: sub showhashsubset {
222: my ($hash,$keyre) = @_;
223: my $resultkey;
224: foreach $resultkey (sort keys %$hash) {
225: if ($resultkey =~ /$keyre/) {
226: if (ref($$hash{$resultkey})) {
227: if ($$hash{$resultkey} =~ /ARRAY/ ) {
228: my $string="$resultkey ---- (";
229: foreach my $elm (@{ $$hash{$resultkey} }) {
230: $string.="$elm,";
231: }
232: chop($string);
233: &Apache::lonxml::debug("$string)");
234: } else {
235: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
236: }
237: } else {
238: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
239: }
240: }
241: }
242: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
243: return '';
244: }
245:
246: sub setuppermissions {
247: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
248: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
249: return ''
250: }
251:
252: sub setupheader {
253: my $request=$_[0];
254: if ($ENV{'browser.mathml'}) {
255: $request->content_type('text/xml');
256: } else {
257: $request->content_type('text/html');
258: }
259: if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
260: &Apache::loncommon::no_cache($request);
261: }
262: $request->send_http_header;
263: return OK if $request->header_only;
264: return ''
265: }
266:
267: sub handle_save_or_undo {
268: my ($request,$problem,$result) = @_;
269: my $file = &Apache::lonnet::filelocation("",$request->uri);
270: my $filebak =$file.".bak";
271: my $filetmp =$file.".tmp";
272: my $error=0;
273:
274: if ($ENV{'form.Undo'} eq 'undo') {
275: my $error=0;
276: if (!copy($file,$filetmp)) { $error=1; }
277: if ((!$error) && (!copy($filebak,$file))) { $error=1; }
278: if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
279: if (!$error) {
280: $request->print("<p><b>Undid changes, Switched $filebak and $file</b></p>");
281: } else {
282: $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");
283: $error=1;
284: }
285: } else {
286: my $fs=Apache::File->new(">$filebak");
287: if (defined($fs)) {
288: print $fs $$problem;
289: $request->print("<b>Making Backup to $filebak</b><br />");
290: } else {
291: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");
292: $error=2;
293: }
294: my $fh=Apache::File->new(">$file");
295: if (defined($fh)) {
296: print $fh $$result;
297: $request->print("<b>Saving Modifications to $file</b><br />");
298: } else {
299: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");
300: $error|=4;
301: }
302: }
303: return $error;
304: }
305:
306: sub analyze {
307: my ($request,$file) = @_;
308: &Apache::lonxml::debug("Analyze");
309: my $result=&Apache::lonnet::ssi($request->uri,('grade_target' => 'analyze'));
310: &Apache::lonxml::debug(":$result:");
311: (my $garbage,$result)=split(/_HASH_REF__/,$result,2);
312: &showhash(&Apache::lonnet::str2hash($result));
313: return $result;
314: }
315:
316: sub editxmlmode {
317: my ($request,$file) = @_;
318: my $result;
319: my $problem=&Apache::lonnet::getfile($file);
320: if ($problem == -1) {
321: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
322: $problem='';
323: }
324: if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
325: my $error=&handle_save_or_undo($request,\$problem,
326: \$ENV{'form.editxmltext'});
327: if (!$error) { $problem=&Apache::lonnet::getfile($file); }
328: }
329: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
330: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
331: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
332: $ENV{'form.problemmode'}='View';
333: &renderpage($request,$file);
334: } else {
335: my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
336: my $xml_help = Apache::loncommon::help_open_topic("Problem_Editor_XML_Index");
337: if ($cols > 80) { $cols = 80; }
338: if ($cols < 70) { $cols = 70; }
339: if ($rows < 20) { $rows = 20; }
340: $result.='<html><body bgcolor="#FFFFFF">
341: <form name="lonhomework" method="POST" action="'.
342: $ENV{'request.uri'}.'">
343: <input type="hidden" name="problemmode" value="EditXML" />
344: <input type="submit" name="problemmode" value="Discard Edits and View" />
345: <input type="submit" name="problemmode" value="Edit" />
346: <hr />
347: <input type="submit" name="submit" value="Submit Changes" />
348: <input type="submit" name="submit" value="Submit Changes and View" />
349: <input type="submit" name="Undo" value="undo" />
350: <hr />
351: ' . $xml_help . ' Problem Help<br>
352: <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
353: &HTML::Entities::encode($problem).'</textarea>
354: </form></body></html>';
355: $request->print($result);
356: }
357: return '';
358: }
359:
360: sub renderpage {
361: my ($request,$file) = @_;
362:
363: my (@targets) = &get_target();
364: &Apache::lonxml::debug("Running targets ".join(':',@targets));
365: foreach my $target (@targets) {
366: #my $t0 = [&gettimeofday()];
367: my $problem=&Apache::lonnet::getfile($file);
368: if ($problem == -1) {
369: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
370: $problem='';
371: }
372:
373: my %mystyle;
374: my $result = '';
375: &Apache::inputtags::initialize_inputtags;
376: &Apache::edit::initialize_edit;
377: if ($target eq 'analyze') { %Apache::lonhomework::anaylze=(); }
378: if ($target eq 'web') {
379: my ($symb)=&Apache::lonxml::whichuser();
380: if ($symb eq '') {
381: if ($ENV{'request.state'} eq "construct") {
382: } else {
383: my $help = Apache::loncommon::help_open_topic("Ambiguous_Reference");
384: $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored $help<br />");
385: }
386: }
387: #if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }
388: }
389: if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
390: if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}
391:
392: my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
393: if ($default == -1) {
394: &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");
395: $default='';
396: }
397: &Apache::lonxml::debug("Should be parsing now");
398: $result = &Apache::lonxml::xmlparse($request, $target, $problem,
399: $default.&setup_vars($target),%mystyle);
400:
401: #$request->print("Result follows:");
402: if ($target eq 'modified') {
403: &handle_save_or_undo($request,\$problem,\$result);
404: } else {
405: if ($target eq 'analyze') {
406: $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
407: undef(%Apache::lonhomework::analyze);
408: }
409: #my $td=&tv_interval($t0);
410: #if ( $Apache::lonxml::debug) {
411: #$result =~ s:</body>::;
412: #$result.="<br />Spent $td seconds processing target $target\n</body>";
413: #}
414: $request->print($result);
415: }
416: #$request->print(":Result ends");
417: #my $td=&tv_interval($t0);
418: }
419: }
420:
421: # with no arg it returns a HTML <option> list of the template titles
422: # with one arg it returns the filename associated with the arg passed
423: sub get_template_list {
424: my ($namewanted,$extension) = @_;
425: my $result;
426: my @allnames;
427: &Apache::lonxml::debug("Looking for :$extension:");
428: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
429: my $name=&Apache::lonnet::metadata($file,'title');
430: if ($namewanted && ($name eq $namewanted)) {
431: $result=$file;
432: last;
433: } else {
434: push (@allnames, $name);
435: }
436: }
437: if (@allnames && !$result) {
438: $result="<option>Select a $extension type</option>\n<option>".
439: join('</option><option>',sort(@allnames)).'</option>';
440: }
441: return $result;
442: }
443:
444: sub newproblem {
445: my ($request) = @_;
446: my $extension=$request->uri;
447: $extension=~s:^.*\.([\w]+)$:$1:;
448: &Apache::lonxml::debug("Looking for :$extension:");
449: if ($ENV{'form.template'} &&
450: $ENV{'form.template'} ne "Select a $extension type") {
451: use File::Copy;
452: my $file = &get_template_list($ENV{'form.template'},$extension);
453: my $dest = &Apache::lonnet::filelocation("",$request->uri);
454: copy($file,$dest);
455: &renderpage($request,$dest);
456: } elsif($ENV{'form.newfile'}) {
457: # I don't like hard-coded filenames but for now, this will work.
458: use File::Copy;
459: my $templatefilename =
460: $request->dir_config('lonIncludes').'/templates/blank.problem';
461: &Apache::lonxml::debug("$templatefilename");
462: my $dest = &Apache::lonnet::filelocation("",$request->uri);
463: copy($templatefilename,$dest);
464: &renderpage($request,$dest);
465: } else {
466: my $templatelist=&get_template_list('',$extension);
467: my $url=$request->uri;
468: my $dest = &Apache::lonnet::filelocation("",$request->uri);
469: my $instructions;
470: if ($templatelist) { $instructions=", select a template from the pull-down menu below. Then";}
471: $request->print(<<ENDNEWPROBLEM);
472: <body bgcolor="#FFFFFF">
473: The requested file $url doesn\'t exist. <br />
474: To create a new $extension$instructions click on the Create $extension button.
475: <form action="$url" method="POST">
476: ENDNEWPROBLEM
477: if (defined($templatelist)) {
478: $request->print("<select name=\"template\">$templatelist</select>");
479: }
480: $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"Create $extension\" />");
481: $request->print("</form></body>");
482: }
483: return '';
484: }
485:
486: sub view_or_edit_menu {
487: my ($request) = @_;
488: my $url=$request->uri;
489: $request->print(<<EDITMENU);
490: <body bgcolor="#FFFFFF">
491: <form action="$url" method="POST">
492: Would you like to <input type="submit" name="problemmode" value="View"> or
493: <input type="submit" name="problemmode" value="Edit"> the problem.
494: </form>
495: </body>
496: EDITMENU
497: }
498:
499: sub handler {
500: #my $t0 = [&gettimeofday()];
501: my $request=$_[0];
502:
503: if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}
504:
505: if (&setupheader($request)) { return OK; }
506: $ENV{'request.uri'}=$request->uri;
507:
508: #setup permissions
509: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
510: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
511: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
512: # some times multiple problemmodes are submitted, need to select
513: # the last one
514: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
515: if ( defined($ENV{'form.problemmode'}) &&
516: ref($ENV{'form.problemmode'}) ) {
517: &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
518: my $mode=$ENV{'form.problemmode'}->[-1];
519: undef $ENV{'form.problemmode'};
520: $ENV{'form.problemmode'}=$mode;
521: }
522: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
523: my $file=&Apache::lonnet::filelocation("",$request->uri);
524:
525: #check if we know where we are
526: if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {
527: # if we are browsing we might not be able to know where we are
528: if ($Apache::lonhomework::browse ne 'F') {
529: #should know where we are, so ask
530: $request->internal_redirect('/adm/ambiguous'); return;
531: }
532: }
533:
534: if ($ENV{'request.state'} eq "construct") {
535: if ($ENV{'form.resetdata'} eq 'Reset Submissions') {
536: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
537: &Apache::lonnet::tmpreset($symb,'',$domain,$name);
538: }
539: if ( -e $file ) {
540: if (!(defined $ENV{'form.problemmode'})) {
541: #first visit to problem in construction space
542: #&view_or_edit_menu($request);
543: $ENV{'form.problemmode'}='View';
544: &renderpage($request,$file);
545: } elsif ($ENV{'form.problemmode'} eq 'EditXML') {
546: &editxmlmode($request,$file);
547: } elsif ($ENV{'form.problemmode'} eq 'Answer Distribution') {
548: &analyze($request,$file);
549: } else {
550: &renderpage($request,$file);
551: }
552: } else {
553: # requested file doesn't exist in contruction space
554: &newproblem($request);
555: }
556: } else {
557: # just render the page normally outside of construction space
558: &Apache::lonxml::debug("not construct");
559: &renderpage($request,$file);
560: }
561: #my $td=&tv_interval($t0);
562: #&Apache::lonxml::debug("Spent $td seconds processing");
563: # &Apache::lonhomework::send_footer($request);
564: # always turn off debug messages
565: $Apache::lonxml::debug=0;
566: return OK;
567:
568: }
569:
570: 1;
571: __END__
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lonhomework.pm CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / loncom / homework