1: # The LearningOnline Network with CAPA
2: # The LON-CAPA Homework handler
3: #
4: # $Id: lonhomework.pm,v 1.81 2002/06/26 17:20:38 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:
32: package Apache::lonhomework;
33: use strict;
34: use Apache::style();
35: use Apache::lonxml();
36: use Apache::lonnet();
37: use Apache::lonplot();
38: use Apache::inputtags();
39: use Apache::structuretags();
40: use Apache::randomlabel();
41: use Apache::response();
42: use Apache::hint();
43: use Apache::outputtags();
44: use Apache::Constants qw(:common);
45: use HTML::Entities();
46: #use Time::HiRes qw( gettimeofday tv_interval );
47:
48: BEGIN {
49: &Apache::lonxml::register_insert();
50: }
51:
52: sub get_target {
53: if ( $ENV{'request.state'} eq "published") {
54: if ( defined($ENV{'form.grade_target'})
55: && ($Apache::lonhomework::viewgrades == 'F' )) {
56: return ($ENV{'form.grade_target'});
57: }
58: if ( defined($ENV{'form.submitted'})) {
59: return ('grade', 'web');
60: } else {
61: return ('web');
62: }
63: } elsif ($ENV{'request.state'} eq "construct") {
64: if ( defined($ENV{'form.grade_target'}) ) {
65: return ($ENV{'form.grade_target'});
66: }
67: if ( defined($ENV{'form.preview'})) {
68: if ( defined($ENV{'form.submitted'})) {
69: return ('grade', 'web');
70: } else {
71: return ('web');
72: }
73: } else {
74: if ( $ENV{'form.problemmode'} eq 'View' ) {
75: if ( defined($ENV{'form.submitted'}) &&
76: (!defined($ENV{'form.resetdata'})) ) {
77: return ('grade', 'web','answer');
78: } else {
79: return ('web','answer');
80: }
81: } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
82: if ( $ENV{'form.submitted'} eq 'edit' ) {
83: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
84: return ('modified','web','answer');
85: } else {
86: return ('modified','edit');
87: }
88: } else {
89: return ('edit');
90: }
91: } else {
92: return ('web');
93: }
94: }
95: }
96: return ();
97: }
98:
99: sub setup_vars {
100: my ($target) = @_;
101: return ';'
102: # return ';$external::target='.$target.';';
103: }
104:
105: sub send_header {
106: my ($request)= @_;
107: $request->print(&Apache::lontexconvert::header());
108: # $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
109: }
110:
111: sub createmenu {
112: my ($which,$request)=@_;
113: if ($which eq 'grade') {
114: $request->print('<script language="JavaScript">
115: hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
116: "height=350,width=150,menubar=no");
117: </script>');
118: }
119: }
120:
121: sub send_footer {
122: my ($request)= @_;
123: # $request->print('</form>');
124: $request->print(&Apache::lontexconvert::footer());
125: }
126:
127: $Apache::lonxml::browse='';
128:
129: sub check_access {
130: my ($id) = @_;
131: my $date ='';
132: my $status = '';
133: my $datemsg = '';
134: my $lastdate = '';
135: my $temp;
136: my $type;
137: my $passed;
138: &Apache::lonxml::debug("checking for part :$id:");
139: &Apache::lonxml::debug("time:".time);
140: foreach $temp ("opendate","duedate","answerdate") {
141: $lastdate = $date;
142: $date = &Apache::lonnet::EXT("resource.$id.$temp");
143: &Apache::lonxml::debug("found :$date: for :$temp:");
144: if ($date eq '') {
145: $date = "an unknown date"; $passed = 0;
146: } elsif ($date eq 'con_lost') {
147: $date = "an indeterminate date"; $passed = 0;
148: } else {
149: if (time < $date) { $passed = 0; } else { $passed = 1; }
150: $date = localtime $date;
151: }
152: if (!$passed) { $type=$temp; last; }
153: }
154: &Apache::lonxml::debug("have :$type:$passed:");
155: if ($passed) {
156: $status='SHOW_ANSWER';
157: $datemsg=$date;
158: } elsif ($type eq 'opendate') {
159: $status='CLOSED';
160: $datemsg = "will open on $date";
161: } elsif ($type eq 'duedate') {
162: $status='CAN_ANSWER';
163: $datemsg = "is due at $date";
164: } elsif ($type eq 'answerdate') {
165: $status='CLOSED';
166: $datemsg = "was due on $lastdate, and answers will be available on $date";
167: }
168: if ($status eq 'CAN_ANSWER') {
169: #check #tries
170: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
171: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
172: if ( $tries eq '' ) { $tries = '0'; }
173: if ( $maxtries eq '' ) { $maxtries = '2'; }
174: if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
175: }
176:
177: if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
178: (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
179: return ('UNCHECKEDOUT','needs to be checked out');
180: }
181:
182:
183: &Apache::lonxml::debug("sending back :$status:$datemsg:");
184: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
185: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
186: $status='CAN_ANSWER';
187: $datemsg='is closed but you are allowed to view it';
188: }
189: if ($ENV{'request.state'} eq "construct") {
190: &Apache::lonxml::debug("in construction ignoring dates");
191: $status='CAN_ANSWER';
192: $datemsg='is in under construction';
193: }
194: return ($status,$datemsg);
195: }
196:
197: sub showhash {
198: my (%hash) = @_;
199: &showhashsubset(\%hash,'');
200: return '';
201: }
202:
203: sub showhashsubset {
204: my ($hash,$keyre) = @_;
205: my $resultkey;
206: foreach $resultkey (sort keys %$hash) {
207: if ($resultkey =~ /$keyre/) {
208: if (ref($$hash{$resultkey})) {
209: if ($$hash{$resultkey} =~ /ARRAY/ ) {
210: my $string="$resultkey ---- (";
211: foreach my $elm (@{ $$hash{$resultkey} }) {
212: $string.="$elm,";
213: }
214: chop($string);
215: &Apache::lonxml::debug("$string)");
216: } else {
217: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
218: }
219: } else {
220: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
221: }
222: }
223: }
224: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
225: return '';
226: }
227:
228: sub setuppermissions {
229: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
230: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
231: return ''
232: }
233:
234: sub setupheader {
235: my $request=$_[0];
236: if ($ENV{'browser.mathml'}) {
237: $request->content_type('text/xml');
238: } else {
239: $request->content_type('text/html');
240: }
241: if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
242: &Apache::loncommon::no_cache($request);
243: }
244: $request->send_http_header;
245: return OK if $request->header_only;
246: return ''
247: }
248:
249: sub handle_save_or_undo {
250: my ($request,$problem,$result) = @_;
251: my $file = &Apache::lonnet::filelocation("",$request->uri);
252: my $filebak =$file.".bak";
253: my $filetmp =$file.".tmp";
254: my $error=0;
255:
256: if ($ENV{'form.Undo'} eq 'undo') {
257: my $error=0;
258: if (!copy($file,$filetmp)) { $error=1; }
259: if ((!$error) && (!copy($filebak,$file))) { $error=1; }
260: if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
261: if (!$error) {
262: $request->print("<p><b>Undid changes, Switched $filebak and $file</b></p>");
263: } else {
264: $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");
265: $error=1;
266: }
267: } else {
268: my $fs=Apache::File->new(">$filebak");
269: if (defined($fs)) {
270: print $fs $$problem;
271: $request->print("<b>Making Backup to $filebak</b><br />");
272: } else {
273: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");
274: $error=2;
275: }
276: my $fh=Apache::File->new(">$file");
277: if (defined($fh)) {
278: print $fh $$result;
279: $request->print("<b>Saving Modifications to $file</b><br />");
280: } else {
281: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");
282: $error|=4;
283: }
284: }
285: return $error;
286: }
287:
288: sub analyze {
289: my ($request,$file) = @_;
290: &Apache::lonxml::debug("Analyze");
291: my $result=&Apache::lonnet::ssi($request->uri,('grade_target' => 'analyze'));
292: &Apache::lonxml::debug(":$result:");
293: (my $garbage,$result)=split(/_HASH_REF__/,$result,2);
294: &showhash(&Apache::lonnet::str2hash($result));
295: return $result;
296: }
297:
298: sub editxmlmode {
299: my ($request,$file) = @_;
300: my $result;
301: my $problem=&Apache::lonnet::getfile($file);
302: if ($problem == -1) {
303: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
304: $problem='';
305: }
306: if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
307: my $error=&handle_save_or_undo($request,\$problem,
308: \$ENV{'form.editxmltext'});
309: if (!$error) { $problem=&Apache::lonnet::getfile($file); }
310: }
311: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
312: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
313: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
314: $ENV{'form.problemmode'}='View';
315: &renderpage($request,$file);
316: } else {
317: my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
318: if ($cols > 80) { $cols = 80; }
319: $result.='<html><body bgcolor="#FFFFFF">
320: <form name="lonhomework" method="POST" action="'.
321: $ENV{'request.uri'}.'">
322: <input type="hidden" name="problemmode" value="EditXML" />
323: <input type="submit" name="problemmode" value="Discard Edits and View" />
324: <input type="submit" name="problemmode" value="Edit" />
325: <hr />
326: <input type="submit" name="submit" value="Submit Changes" />
327: <input type="submit" name="submit" value="Submit Changes and View" />
328: <input type="submit" name="Undo" value="undo" />
329: <hr />
330: <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
331: &HTML::Entities::encode($problem).'</textarea>
332: </form></body></html>';
333: $request->print($result);
334: }
335: return '';
336: }
337:
338: sub renderpage {
339: my ($request,$file) = @_;
340:
341: my (@targets) = &get_target();
342: &Apache::lonxml::debug("Running targets ".join(':',@targets));
343: foreach my $target (@targets) {
344: #my $t0 = [&gettimeofday()];
345: my $problem=&Apache::lonnet::getfile($file);
346: if ($problem == -1) {
347: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
348: $problem='';
349: }
350:
351: my %mystyle;
352: my $result = '';
353: &Apache::inputtags::initialize_inputtags;
354: &Apache::edit::initialize_edit;
355: if ($target eq 'analyze') { %Apache::lonhomework::anaylze=(); }
356: if ($target eq 'web') {
357: my ($symb)=&Apache::lonxml::whichuser();
358: if ($symb eq '') {
359: if ($ENV{'request.state'} eq "construct") {
360: } else {
361: $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored<br />");
362: }
363: }
364: #if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }
365: }
366: #if ($target eq 'grade') { &showhash(%Apache::lonhomework::history); }
367: #if ($target eq 'web') { &showhash(%ENV); }
368:
369: my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
370: if ($default == -1) {
371: &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");
372: $default='';
373: }
374: &Apache::lonxml::debug("Should be parsing now");
375: $result = &Apache::lonxml::xmlparse($request, $target, $problem,
376: $default.&setup_vars($target),%mystyle);
377:
378: #$request->print("Result follows:");
379: if ($target eq 'modified') {
380: &handle_save_or_undo($request,\$problem,\$result);
381: } else {
382: if ($target eq 'analyze') {
383: $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
384: undef(%Apache::lonhomework::analyze);
385: }
386: #my $td=&tv_interval($t0);
387: #if ( $Apache::lonxml::debug) {
388: #$result =~ s:</body>::;
389: #$result.="<br />Spent $td seconds processing target $target\n</body>";
390: #}
391: $request->print($result);
392: }
393: #$request->print(":Result ends");
394: #my $td=&tv_interval($t0);
395: }
396: }
397:
398: # with no arg it returns a HTML <option> list of the template titles
399: # with one arg it returns the filename associated with the arg passed
400: sub get_template_list {
401: my ($namewanted,$extension) = @_;
402: my $result;
403: &Apache::lonxml::debug("Looking for :$extension:");
404: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
405: my $name=&Apache::lonnet::metadata($file,'title');
406: if ($namewanted && ($name eq $namewanted)) {
407: $result=$file;
408: last;
409: } else {
410: $result.="<option>$name</option>";
411: }
412: }
413: return $result;
414: }
415:
416: sub newproblem {
417: my ($request) = @_;
418: my $extension=$request->uri;
419: $extension=~s:^.*\.([\w]+)$:$1:;
420: &Apache::lonxml::debug("Looking for :$extension:");
421: if ($ENV{'form.template'}) {
422: use File::Copy;
423: my $file = &get_template_list($ENV{'form.template'},$extension);
424: my $dest = &Apache::lonnet::filelocation("",$request->uri);
425: copy($file,$dest);
426: &renderpage($request,$dest);
427: } elsif($ENV{'form.newfile'}) {
428: # I don't like hard-coded filenames but for now, this will work.
429: use File::Copy;
430: my $templatefilename =
431: $request->dir_config('lonIncludes').'/templates/blank.problem';
432: &Apache::lonxml::debug("$templatefilename");
433: my $dest = &Apache::lonnet::filelocation("",$request->uri);
434: copy($templatefilename,$dest);
435: &renderpage($request,$dest);
436: }else {
437: my $templatelist=&get_template_list('',$extension);
438: my $url=$request->uri;
439: my $dest = &Apache::lonnet::filelocation("",$request->uri);
440: if (!defined($templatelist)) {
441: # We didn't find a template, so just create a blank problem.
442: $request->print(<<ENDNEWPROBLEM);
443: <body bgcolor="#FFFFFF">
444: The requested file $url doesn\'t exist. You can create a new $extension <br />
445: <form action="$url" method="POST">
446: <input type="submit" name="newfile" value="New $extension"><br />
447: </form>
448: </body>
449: ENDNEWPROBLEM
450: return '';
451: }
452: $request->print(<<ENDNEWPROBLEM);
453: <body bgcolor="#FFFFFF">
454: The requested file $url doesn\'t exist. You can create a new $extension <br />
455: <form action="$url" method="POST">
456: <input type="submit" value="New $extension"><br />
457: <select name="template">
458: $templatelist
459: </select>
460: </form>
461: </body>
462: ENDNEWPROBLEM
463: }
464: return '';
465: }
466:
467: sub view_or_edit_menu {
468: my ($request) = @_;
469: my $url=$request->uri;
470: $request->print(<<EDITMENU);
471: <body bgcolor="#FFFFFF">
472: <form action="$url" method="POST">
473: Would you like to <input type="submit" name="problemmode" value="View"> or
474: <input type="submit" name="problemmode" value="Edit"> the problem.
475: </form>
476: </body>
477: EDITMENU
478: }
479:
480: sub handler {
481: #my $t0 = [&gettimeofday()];
482: my $request=$_[0];
483:
484: if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}
485:
486: if (&setupheader($request)) { return OK; }
487: $ENV{'request.uri'}=$request->uri;
488:
489: #setup permissions
490: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
491: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
492: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
493: # some times multiple problemmodes are submitted, need to select
494: # the last one
495: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
496: if ( defined($ENV{'form.problemmode'}) &&
497: ref($ENV{'form.problemmode'}) ) {
498: &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
499: my $mode=$ENV{'form.problemmode'}->[-1];
500: undef $ENV{'form.problemmode'};
501: $ENV{'form.problemmode'}=$mode;
502: }
503: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
504: my $file=&Apache::lonnet::filelocation("",$request->uri);
505:
506: #check if we know where we are
507: if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {
508: # if we are browsing we might not be able to know where we are
509: if ($Apache::lonhomework::browse ne 'F') {
510: #should know where we are, so ask
511: $request->internal_redirect('/adm/ambiguous'); return;
512: }
513: }
514:
515: if ($ENV{'request.state'} eq "construct") {
516: if ($ENV{'form.resetdata'} eq 'Reset Submissions') {
517: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
518: &Apache::lonnet::tmpreset($symb,'',$domain,$name);
519: }
520: if ( -e $file ) {
521: if (!(defined $ENV{'form.problemmode'})) {
522: #first visit to problem in construction space
523: #&view_or_edit_menu($request);
524: $ENV{'form.problemmode'}='View';
525: &renderpage($request,$file);
526: } elsif ($ENV{'form.problemmode'} eq 'EditXML') {
527: &editxmlmode($request,$file);
528: } elsif ($ENV{'form.problemmode'} eq 'Answer Distribution') {
529: &analyze($request,$file);
530: } else {
531: &renderpage($request,$file);
532: }
533: } else {
534: # requested file doesn't exist in contruction space
535: &newproblem($request);
536: }
537: } else {
538: # just render the page normally outside of construction space
539: &Apache::lonxml::debug("not construct");
540: &renderpage($request,$file);
541: }
542: #my $td=&tv_interval($t0);
543: #&Apache::lonxml::debug("Spent $td seconds processing");
544: # &Apache::lonhomework::send_footer($request);
545: # always turn off debug messages
546: $Apache::lonxml::debug=0;
547: return OK;
548:
549: }
550:
551: 1;
552: __END__
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