1: # The LearningOnline Network with CAPA
2: # The LON-CAPA Homework handler
3: #
4: # $Id: lonhomework.pm,v 1.82 2002/07/18 20:52:36 bowersj2 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::Constants qw(:common);
46: use HTML::Entities();
47: use Apache::loncommon;
48: #use Time::HiRes qw( gettimeofday tv_interval );
49:
50: BEGIN {
51: &Apache::lonxml::register_insert();
52: }
53:
54: sub get_target {
55: if ( $ENV{'request.state'} eq "published") {
56: if ( defined($ENV{'form.grade_target'})
57: && ($Apache::lonhomework::viewgrades == 'F' )) {
58: return ($ENV{'form.grade_target'});
59: }
60: if ( defined($ENV{'form.submitted'})) {
61: return ('grade', 'web');
62: } else {
63: return ('web');
64: }
65: } elsif ($ENV{'request.state'} eq "construct") {
66: if ( defined($ENV{'form.grade_target'}) ) {
67: return ($ENV{'form.grade_target'});
68: }
69: if ( defined($ENV{'form.preview'})) {
70: if ( defined($ENV{'form.submitted'})) {
71: return ('grade', 'web');
72: } else {
73: return ('web');
74: }
75: } else {
76: if ( $ENV{'form.problemmode'} eq 'View' ) {
77: if ( defined($ENV{'form.submitted'}) &&
78: (!defined($ENV{'form.resetdata'})) ) {
79: return ('grade', 'web','answer');
80: } else {
81: return ('web','answer');
82: }
83: } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
84: if ( $ENV{'form.submitted'} eq 'edit' ) {
85: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
86: return ('modified','web','answer');
87: } else {
88: return ('modified','edit');
89: }
90: } else {
91: return ('edit');
92: }
93: } else {
94: return ('web');
95: }
96: }
97: }
98: return ();
99: }
100:
101: sub setup_vars {
102: my ($target) = @_;
103: return ';'
104: # return ';$external::target='.$target.';';
105: }
106:
107: sub send_header {
108: my ($request)= @_;
109: $request->print(&Apache::lontexconvert::header());
110: # $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
111: }
112:
113: sub createmenu {
114: my ($which,$request)=@_;
115: if ($which eq 'grade') {
116: $request->print('<script language="JavaScript">
117: hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
118: "height=350,width=150,menubar=no");
119: </script>');
120: }
121: }
122:
123: sub send_footer {
124: my ($request)= @_;
125: # $request->print('</form>');
126: $request->print(&Apache::lontexconvert::footer());
127: }
128:
129: $Apache::lonxml::browse='';
130:
131: sub check_access {
132: my ($id) = @_;
133: my $date ='';
134: my $status = '';
135: my $datemsg = '';
136: my $lastdate = '';
137: my $temp;
138: my $type;
139: my $passed;
140: &Apache::lonxml::debug("checking for part :$id:");
141: &Apache::lonxml::debug("time:".time);
142: foreach $temp ("opendate","duedate","answerdate") {
143: $lastdate = $date;
144: $date = &Apache::lonnet::EXT("resource.$id.$temp");
145: &Apache::lonxml::debug("found :$date: for :$temp:");
146: if ($date eq '') {
147: $date = "an unknown date"; $passed = 0;
148: } elsif ($date eq 'con_lost') {
149: $date = "an indeterminate date"; $passed = 0;
150: } else {
151: if (time < $date) { $passed = 0; } else { $passed = 1; }
152: $date = localtime $date;
153: }
154: if (!$passed) { $type=$temp; last; }
155: }
156: &Apache::lonxml::debug("have :$type:$passed:");
157: if ($passed) {
158: $status='SHOW_ANSWER';
159: $datemsg=$date;
160: } elsif ($type eq 'opendate') {
161: $status='CLOSED';
162: $datemsg = "will open on $date";
163: } elsif ($type eq 'duedate') {
164: $status='CAN_ANSWER';
165: $datemsg = "is due at $date";
166: } elsif ($type eq 'answerdate') {
167: $status='CLOSED';
168: $datemsg = "was due on $lastdate, and answers will be available on $date";
169: }
170: if ($status eq 'CAN_ANSWER') {
171: #check #tries
172: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
173: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
174: if ( $tries eq '' ) { $tries = '0'; }
175: if ( $maxtries eq '' ) { $maxtries = '2'; }
176: if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
177: }
178:
179: if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
180: (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
181: return ('UNCHECKEDOUT','needs to be checked out');
182: }
183:
184:
185: &Apache::lonxml::debug("sending back :$status:$datemsg:");
186: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
187: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
188: $status='CAN_ANSWER';
189: $datemsg='is closed but you are allowed to view it';
190: }
191: if ($ENV{'request.state'} eq "construct") {
192: &Apache::lonxml::debug("in construction ignoring dates");
193: $status='CAN_ANSWER';
194: $datemsg='is in under construction';
195: }
196: return ($status,$datemsg);
197: }
198:
199: sub showhash {
200: my (%hash) = @_;
201: &showhashsubset(\%hash,'');
202: return '';
203: }
204:
205: sub showhashsubset {
206: my ($hash,$keyre) = @_;
207: my $resultkey;
208: foreach $resultkey (sort keys %$hash) {
209: if ($resultkey =~ /$keyre/) {
210: if (ref($$hash{$resultkey})) {
211: if ($$hash{$resultkey} =~ /ARRAY/ ) {
212: my $string="$resultkey ---- (";
213: foreach my $elm (@{ $$hash{$resultkey} }) {
214: $string.="$elm,";
215: }
216: chop($string);
217: &Apache::lonxml::debug("$string)");
218: } else {
219: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
220: }
221: } else {
222: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
223: }
224: }
225: }
226: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
227: return '';
228: }
229:
230: sub setuppermissions {
231: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
232: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
233: return ''
234: }
235:
236: sub setupheader {
237: my $request=$_[0];
238: if ($ENV{'browser.mathml'}) {
239: $request->content_type('text/xml');
240: } else {
241: $request->content_type('text/html');
242: }
243: if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
244: &Apache::loncommon::no_cache($request);
245: }
246: $request->send_http_header;
247: return OK if $request->header_only;
248: return ''
249: }
250:
251: sub handle_save_or_undo {
252: my ($request,$problem,$result) = @_;
253: my $file = &Apache::lonnet::filelocation("",$request->uri);
254: my $filebak =$file.".bak";
255: my $filetmp =$file.".tmp";
256: my $error=0;
257:
258: if ($ENV{'form.Undo'} eq 'undo') {
259: my $error=0;
260: if (!copy($file,$filetmp)) { $error=1; }
261: if ((!$error) && (!copy($filebak,$file))) { $error=1; }
262: if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
263: if (!$error) {
264: $request->print("<p><b>Undid changes, Switched $filebak and $file</b></p>");
265: } else {
266: $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");
267: $error=1;
268: }
269: } else {
270: my $fs=Apache::File->new(">$filebak");
271: if (defined($fs)) {
272: print $fs $$problem;
273: $request->print("<b>Making Backup to $filebak</b><br />");
274: } else {
275: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");
276: $error=2;
277: }
278: my $fh=Apache::File->new(">$file");
279: if (defined($fh)) {
280: print $fh $$result;
281: $request->print("<b>Saving Modifications to $file</b><br />");
282: } else {
283: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");
284: $error|=4;
285: }
286: }
287: return $error;
288: }
289:
290: sub analyze {
291: my ($request,$file) = @_;
292: &Apache::lonxml::debug("Analyze");
293: my $result=&Apache::lonnet::ssi($request->uri,('grade_target' => 'analyze'));
294: &Apache::lonxml::debug(":$result:");
295: (my $garbage,$result)=split(/_HASH_REF__/,$result,2);
296: &showhash(&Apache::lonnet::str2hash($result));
297: return $result;
298: }
299:
300: sub editxmlmode {
301: my ($request,$file) = @_;
302: my $result;
303: my $problem=&Apache::lonnet::getfile($file);
304: if ($problem == -1) {
305: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
306: $problem='';
307: }
308: if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
309: my $error=&handle_save_or_undo($request,\$problem,
310: \$ENV{'form.editxmltext'});
311: if (!$error) { $problem=&Apache::lonnet::getfile($file); }
312: }
313: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
314: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
315: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
316: $ENV{'form.problemmode'}='View';
317: &renderpage($request,$file);
318: } else {
319: my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
320: my $xml_help = Apache::loncommon::help_open_topic("Problem_Editor_XML_Index");
321: if ($cols > 80) { $cols = 80; }
322: $result.='<html><body bgcolor="#FFFFFF">
323: <form name="lonhomework" method="POST" action="'.
324: $ENV{'request.uri'}.'">
325: <input type="hidden" name="problemmode" value="EditXML" />
326: <input type="submit" name="problemmode" value="Discard Edits and View" />
327: <input type="submit" name="problemmode" value="Edit" />
328: <hr />
329: <input type="submit" name="submit" value="Submit Changes" />
330: <input type="submit" name="submit" value="Submit Changes and View" />
331: <input type="submit" name="Undo" value="undo" />
332: <hr />
333: ' . $xml_help . ' Problem Help<br>
334: <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
335: &HTML::Entities::encode($problem).'</textarea>
336: </form></body></html>';
337: $request->print($result);
338: }
339: return '';
340: }
341:
342: sub renderpage {
343: my ($request,$file) = @_;
344:
345: my (@targets) = &get_target();
346: &Apache::lonxml::debug("Running targets ".join(':',@targets));
347: foreach my $target (@targets) {
348: #my $t0 = [&gettimeofday()];
349: my $problem=&Apache::lonnet::getfile($file);
350: if ($problem == -1) {
351: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
352: $problem='';
353: }
354:
355: my %mystyle;
356: my $result = '';
357: &Apache::inputtags::initialize_inputtags;
358: &Apache::edit::initialize_edit;
359: if ($target eq 'analyze') { %Apache::lonhomework::anaylze=(); }
360: if ($target eq 'web') {
361: my ($symb)=&Apache::lonxml::whichuser();
362: if ($symb eq '') {
363: if ($ENV{'request.state'} eq "construct") {
364: } else {
365: $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored<br />");
366: }
367: }
368: #if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }
369: }
370: #if ($target eq 'grade') { &showhash(%Apache::lonhomework::history); }
371: #if ($target eq 'web') { &showhash(%ENV); }
372:
373: my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
374: if ($default == -1) {
375: &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");
376: $default='';
377: }
378: &Apache::lonxml::debug("Should be parsing now");
379: $result = &Apache::lonxml::xmlparse($request, $target, $problem,
380: $default.&setup_vars($target),%mystyle);
381:
382: #$request->print("Result follows:");
383: if ($target eq 'modified') {
384: &handle_save_or_undo($request,\$problem,\$result);
385: } else {
386: if ($target eq 'analyze') {
387: $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
388: undef(%Apache::lonhomework::analyze);
389: }
390: #my $td=&tv_interval($t0);
391: #if ( $Apache::lonxml::debug) {
392: #$result =~ s:</body>::;
393: #$result.="<br />Spent $td seconds processing target $target\n</body>";
394: #}
395: $request->print($result);
396: }
397: #$request->print(":Result ends");
398: #my $td=&tv_interval($t0);
399: }
400: }
401:
402: # with no arg it returns a HTML <option> list of the template titles
403: # with one arg it returns the filename associated with the arg passed
404: sub get_template_list {
405: my ($namewanted,$extension) = @_;
406: my $result;
407: &Apache::lonxml::debug("Looking for :$extension:");
408: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
409: my $name=&Apache::lonnet::metadata($file,'title');
410: if ($namewanted && ($name eq $namewanted)) {
411: $result=$file;
412: last;
413: } else {
414: $result.="<option>$name</option>";
415: }
416: }
417: return $result;
418: }
419:
420: sub newproblem {
421: my ($request) = @_;
422: my $extension=$request->uri;
423: $extension=~s:^.*\.([\w]+)$:$1:;
424: &Apache::lonxml::debug("Looking for :$extension:");
425: if ($ENV{'form.template'}) {
426: use File::Copy;
427: my $file = &get_template_list($ENV{'form.template'},$extension);
428: my $dest = &Apache::lonnet::filelocation("",$request->uri);
429: copy($file,$dest);
430: &renderpage($request,$dest);
431: } elsif($ENV{'form.newfile'}) {
432: # I don't like hard-coded filenames but for now, this will work.
433: use File::Copy;
434: my $templatefilename =
435: $request->dir_config('lonIncludes').'/templates/blank.problem';
436: &Apache::lonxml::debug("$templatefilename");
437: my $dest = &Apache::lonnet::filelocation("",$request->uri);
438: copy($templatefilename,$dest);
439: &renderpage($request,$dest);
440: }else {
441: my $templatelist=&get_template_list('',$extension);
442: my $url=$request->uri;
443: my $dest = &Apache::lonnet::filelocation("",$request->uri);
444: if (!defined($templatelist)) {
445: # We didn't find a template, so just create a blank problem.
446: $request->print(<<ENDNEWPROBLEM);
447: <body bgcolor="#FFFFFF">
448: The requested file $url doesn\'t exist. You can create a new $extension <br />
449: <form action="$url" method="POST">
450: <input type="submit" name="newfile" value="New $extension"><br />
451: </form>
452: </body>
453: ENDNEWPROBLEM
454: return '';
455: }
456: $request->print(<<ENDNEWPROBLEM);
457: <body bgcolor="#FFFFFF">
458: The requested file $url doesn\'t exist. You can create a new $extension <br />
459: <form action="$url" method="POST">
460: <input type="submit" value="New $extension"><br />
461: <select name="template">
462: $templatelist
463: </select>
464: </form>
465: </body>
466: ENDNEWPROBLEM
467: }
468: return '';
469: }
470:
471: sub view_or_edit_menu {
472: my ($request) = @_;
473: my $url=$request->uri;
474: $request->print(<<EDITMENU);
475: <body bgcolor="#FFFFFF">
476: <form action="$url" method="POST">
477: Would you like to <input type="submit" name="problemmode" value="View"> or
478: <input type="submit" name="problemmode" value="Edit"> the problem.
479: </form>
480: </body>
481: EDITMENU
482: }
483:
484: sub handler {
485: #my $t0 = [&gettimeofday()];
486: my $request=$_[0];
487:
488: if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}
489:
490: if (&setupheader($request)) { return OK; }
491: $ENV{'request.uri'}=$request->uri;
492:
493: #setup permissions
494: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
495: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
496: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
497: # some times multiple problemmodes are submitted, need to select
498: # the last one
499: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
500: if ( defined($ENV{'form.problemmode'}) &&
501: ref($ENV{'form.problemmode'}) ) {
502: &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
503: my $mode=$ENV{'form.problemmode'}->[-1];
504: undef $ENV{'form.problemmode'};
505: $ENV{'form.problemmode'}=$mode;
506: }
507: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
508: my $file=&Apache::lonnet::filelocation("",$request->uri);
509:
510: #check if we know where we are
511: if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {
512: # if we are browsing we might not be able to know where we are
513: if ($Apache::lonhomework::browse ne 'F') {
514: #should know where we are, so ask
515: $request->internal_redirect('/adm/ambiguous'); return;
516: }
517: }
518:
519: if ($ENV{'request.state'} eq "construct") {
520: if ($ENV{'form.resetdata'} eq 'Reset Submissions') {
521: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
522: &Apache::lonnet::tmpreset($symb,'',$domain,$name);
523: }
524: if ( -e $file ) {
525: if (!(defined $ENV{'form.problemmode'})) {
526: #first visit to problem in construction space
527: #&view_or_edit_menu($request);
528: $ENV{'form.problemmode'}='View';
529: &renderpage($request,$file);
530: } elsif ($ENV{'form.problemmode'} eq 'EditXML') {
531: &editxmlmode($request,$file);
532: } elsif ($ENV{'form.problemmode'} eq 'Answer Distribution') {
533: &analyze($request,$file);
534: } else {
535: &renderpage($request,$file);
536: }
537: } else {
538: # requested file doesn't exist in contruction space
539: &newproblem($request);
540: }
541: } else {
542: # just render the page normally outside of construction space
543: &Apache::lonxml::debug("not construct");
544: &renderpage($request,$file);
545: }
546: #my $td=&tv_interval($t0);
547: #&Apache::lonxml::debug("Spent $td seconds processing");
548: # &Apache::lonhomework::send_footer($request);
549: # always turn off debug messages
550: $Apache::lonxml::debug=0;
551: return OK;
552:
553: }
554:
555: 1;
556: __END__
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