1: # The LearningOnline Network with CAPA
2: # The LON-CAPA Homework handler
3: #
4: # $Id: lonhomework.pm,v 1.252 2006/06/20 05:10:00 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:
29: package Apache::lonhomework;
30: use strict;
31: use Apache::style();
32: use Apache::lonxml();
33: use Apache::lonnet;
34: use Apache::lonplot();
35: use Apache::inputtags();
36: use Apache::structuretags();
37: use Apache::randomlabel();
38: use Apache::response();
39: use Apache::hint();
40: use Apache::outputtags();
41: use Apache::caparesponse();
42: use Apache::radiobuttonresponse();
43: use Apache::optionresponse();
44: use Apache::imageresponse();
45: use Apache::essayresponse();
46: use Apache::externalresponse();
47: use Apache::rankresponse();
48: use Apache::matchresponse();
49: use Apache::chemresponse();
50: use Apache::drawimage();
51: use Apache::Constants qw(:common);
52: use HTML::Entities();
53: use Apache::loncommon();
54: use Apache::lonlocal;
55: use Time::HiRes qw( gettimeofday tv_interval );
56: use Apache::lonnet();
57:
58: # FIXME - improve commenting
59:
60:
61: BEGIN {
62: &Apache::lonxml::register_insert();
63: }
64:
65:
66: #
67: # Decides what targets to render for.
68: # Implicit inputs:
69: # Various session environment variables:
70: # request.state - published - is a /res/ resource
71: # uploaded - is a /uploaded/ resource
72: # contruct - is a /priv/ resource
73: # form.grade_target - a form parameter requesting a specific target
74: sub get_target {
75: &Apache::lonxml::debug("request.state = $env{'request.state'}");
76: if( defined($env{'form.grade_target'})) {
77: &Apache::lonxml::debug("form.grade_target= $env{'form.grade_target'}");
78: } else {
79: &Apache::lonxml::debug("form.grade_target <undefined>");
80: }
81: if (($env{'request.state'} eq "published") ||
82: ($env{'request.state'} eq "uploaded")) {
83: if ( defined($env{'form.grade_target'} )
84: && ($env{'form.grade_target'} eq 'tex')) {
85: return ($env{'form.grade_target'});
86: } elsif ( defined($env{'form.grade_target'} )
87: && ($Apache::lonhomework::viewgrades eq 'F' )) {
88: return ($env{'form.grade_target'});
89: } elsif ( $env{'form.grade_target'} eq 'webgrade'
90: && ($Apache::lonhomework::queuegrade eq 'F' )) {
91: return ($env{'form.grade_target'});
92: }
93: if ($env{'form.webgrade'} &&
94: ($Apache::lonhomework::modifygrades eq 'F'
95: || $Apache::lonhomework::queuegrade eq 'F' )) {
96: return ('grade','webgrade');
97: }
98: if ( defined($env{'form.submitted'}) &&
99: ( !defined($env{'form.resetdata'})) &&
100: ( !defined($env{'form.newrandomization'}))) {
101: return ('grade', 'web');
102: } else {
103: return ('web');
104: }
105: } elsif ($env{'request.state'} eq "construct") {
106: if ( defined($env{'form.grade_target'}) ) {
107: return ($env{'form.grade_target'});
108: }
109: if ( defined($env{'form.preview'})) {
110: if ( defined($env{'form.submitted'})) {
111: return ('grade', 'web');
112: } else {
113: return ('web');
114: }
115: } else {
116: if ( $env{'form.problemmode'} eq &mt('View') ||
117: $env{'form.problemmode'} eq &mt('Discard Edits and View')) {
118: if ( defined($env{'form.submitted'}) &&
119: (!defined($env{'form.resetdata'})) &&
120: (!defined($env{'form.newrandomization'}))) {
121: return ('grade', 'web','answer');
122: } else {
123: return ('web','answer');
124: }
125: } elsif ( $env{'form.problemmode'} eq &mt('Edit') ||
126: $env{'form.problemmode'} eq 'Edit') {
127: if ( $env{'form.submitted'} eq 'edit' ) {
128: if ( $env{'form.submit'} eq &mt('Submit Changes and View') ) {
129: return ('modified','web','answer');
130: } else {
131: return ('modified','no_output_web','edit');
132: }
133: } else {
134: return ('no_output_web','edit');
135: }
136: } else {
137: return ('web');
138: }
139: }
140: }
141: return ();
142: }
143:
144: sub setup_vars {
145: my ($target) = @_;
146: return ';'
147: # return ';$external::target='.$target.';';
148: }
149:
150: sub createmenu {
151: my ($which,$request)=@_;
152: if ($which eq 'grade') {
153: $request->print('<script language="JavaScript">
154: hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
155: "height=350,width=150,menubar=no");
156: </script>');
157: }
158: }
159:
160: sub proctor_checked_in {
161: my ($slot_name,$slot,$type)=@_;
162: my @possible_proctors=split(",",$slot->{'proctor'});
163:
164: return 1 if (!@possible_proctors);
165:
166: my $key;
167: if ($type eq 'Task') {
168: my $version=$Apache::lonhomework::history{'resource.0.version'};
169: $key ="resource.$version.0.checkedin";
170: } elsif ($type eq 'problem') {
171: $key ='resource.0.checkedin';
172: }
173: # backward compatability, used to be username@domain,
174: # now is username:domain
175: my $who = $Apache::lonhomework::history{$key};
176: if ($who !~ /:/) {
177: $who =~ tr/@/:/;
178: }
179: foreach my $possible (@possible_proctors) {
180: if ($who eq $possible
181: && $Apache::lonhomework::history{$key.'.slot'} eq $slot_name) {
182: return 1;
183: }
184: }
185:
186: return 0;
187: }
188:
189: $Apache::lonxml::browse='';
190: sub check_ip_acc {
191: my ($acc)=@_;
192: &Apache::lonxml::debug("acc is $acc");
193: if (!defined($acc) || $acc =~ /^\s*$/ || $acc =~/^\s*no\s*$/i) {
194: return 1;
195: }
196: my $allowed=0;
197: my $ip=$ENV{'REMOTE_ADDR'};
198: my $name;
199: foreach my $pattern (split(',',$acc)) {
200: $pattern =~ s/^\s*//;
201: $pattern =~ s/\s*$//;
202: if ($pattern =~ /\*$/) {
203: #35.8.*
204: $pattern=~s/\*//;
205: if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
206: } elsif ($pattern =~ /(\d+\.\d+\.\d+)\.\[(\d+)-(\d+)\]$/) {
207: #35.8.3.[34-56]
208: my $low=$2;
209: my $high=$3;
210: $pattern=$1;
211: if ($ip =~ /^\Q$pattern\E/) {
212: my $last=(split(/\./,$ip))[3];
213: if ($last <=$high && $last >=$low) { $allowed=1; }
214: }
215: } elsif ($pattern =~ /^\*/) {
216: #*.msu.edu
217: $pattern=~s/\*//;
218: if (!defined($name)) {
219: use Socket;
220: my $netaddr=inet_aton($ip);
221: ($name)=gethostbyaddr($netaddr,AF_INET);
222: }
223: if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
224: } elsif ($pattern =~ /\d+\.\d+\.\d+\.\d+/) {
225: #127.0.0.1
226: if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
227: } else {
228: #some.name.com
229: if (!defined($name)) {
230: use Socket;
231: my $netaddr=inet_aton($ip);
232: ($name)=gethostbyaddr($netaddr,AF_INET);
233: }
234: if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
235: }
236: if ($allowed) { last; }
237: }
238: return $allowed;
239: }
240:
241: sub check_slot_access {
242: my ($id,$type)=@_;
243:
244: # does it pass normal muster
245: my ($status,$datemsg)=&check_access($id);
246:
247: my $useslots = &Apache::lonnet::EXT("resource.0.useslots");
248: if ($useslots ne 'resource' && $useslots ne 'map'
249: && $useslots ne 'map_map') {
250: return ($status,$datemsg);
251: }
252:
253: if ($status eq 'SHOW_ANSWER' ||
254: $status eq 'CLOSED' ||
255: $status eq 'INVALID_ACCESS' ||
256: $status eq 'UNAVAILABLE') {
257: return ($status,$datemsg);
258: }
259: if ($env{'request.state'} eq "construct") {
260: return ($status,$datemsg);
261: }
262:
263: if ($type eq 'Task') {
264: my $version=$Apache::lonhomework::history{'resource.version'};
265: if ($Apache::lonhomework::history{"resource.$version.0.checkedin"} &&
266: $Apache::lonhomework::history{"resource.$version.0.status"} eq 'pass') {
267: return ('SHOW_ANSWER');
268: }
269: }
270:
271: my @slots=
272: (split(':',&Apache::lonnet::EXT("resource.0.availablestudent")),
273: split(':',&Apache::lonnet::EXT("resource.0.available")));
274:
275: # if (!@slots) {
276: # return ($status,$datemsg);
277: # }
278: my $slotstatus='NOT_IN_A_SLOT';
279: my ($returned_slot,$slot_name);
280: foreach my $slot (@slots) {
281: $slot =~ s/(^\s*|\s*$)//g;
282: &Apache::lonxml::debug("getting $slot");
283: my %slot=&Apache::lonnet::get_slot($slot);
284: &Apache::lonhomework::showhash(%slot);
285: if ($slot{'starttime'} < time &&
286: $slot{'endtime'} > time &&
287: &check_ip_acc($slot{'ip'})) {
288: &Apache::lonxml::debug("$slot is good");
289: $slotstatus='NEEDS_CHECKIN';
290: $returned_slot=\%slot;
291: $slot_name=$slot;
292: last;
293: }
294: }
295: if ($slotstatus eq 'NEEDS_CHECKIN' &&
296: &proctor_checked_in($slot_name,$returned_slot,$type)) {
297: &Apache::lonxml::debug("protoctor checked in");
298: $slotstatus='CAN_ANSWER';
299: }
300:
301: my ($is_correct,$got_grade,$checkedin);
302: if ($type eq 'Task') {
303: my $version=$Apache::lonhomework::history{'resource.0.version'};
304: $got_grade =
305: ($Apache::lonhomework::history{"resource.$version.0.status"}
306: =~ /^(?:pass|fail)$/);
307: $is_correct =
308: ($Apache::lonhomework::history{"resource.$version.0.status"} eq 'pass'
309: || $Apache::lonhomework::history{"resource.0.solved"} =~ /^correct_/ );
310: $checkedin =
311: $Apache::lonhomework::history{"resource.$version.0.checkedin"};
312: } elsif ($type eq 'problem') {
313: $got_grade = 1;
314: $checkedin = $Apache::lonhomework::history{"resource.0.checkedin"};
315: $is_correct =
316: ($Apache::lonhomework::history{"resource.0.solved"} =~/^correct_/);
317: }
318:
319: &Apache::lonxml::debug(" slot is $slotstatus checkedin ($checkedin) got_grade ($got_grade) is_correct ($is_correct)");
320:
321: # no slot is currently open, and has been checked in for this version
322: # but hasn't got a grade, therefore must be awaiting a grade
323: if (!defined($slot_name)
324: && $checkedin
325: && !$got_grade) {
326: return ('WAITING_FOR_GRADE');
327: }
328:
329: # no slot is currently open, and has been checked in for this version
330: # previous slot is therefore CLOSED, so therefore the problem is
331: if (!defined($slot_name)
332: && $checkedin
333: && $type eq 'problem') {
334: return ('CLOSED',$datemsg);
335: }
336:
337: if ($slotstatus eq 'NOT_IN_A_SLOT'
338: && $checkedin ) {
339:
340: if ($got_grade) {
341: return ('SHOW_ANSWER');
342: } else {
343: return ('WAITING_FOR_GRADE');
344: }
345:
346: }
347: if ( $is_correct) {
348: return ('SHOW_ANSWER');
349: }
350: if ( $status eq 'CANNOT_ANSWER' &&
351: ($slotstatus ne 'NEEDS_CHECKIN' && $slotstatus ne 'NOT_IN_A_SLOT')) {
352: return ($status,$datemsg);
353: }
354:
355: return ($slotstatus,$datemsg,$slot_name,$returned_slot);
356: }
357:
358: # JB, 9/24/2002: Any changes in this function may require a change
359: # in lonnavmaps::resource::getDateStatus.
360: sub check_access {
361: my ($id) = @_;
362: my $date ='';
363: my $status;
364: my $datemsg = '';
365: my $lastdate = '';
366: my $type;
367: my $passed;
368:
369: if ($env{'request.state'} eq "construct") {
370: if ($env{'form.problemstate'}) {
371: if ($env{'form.problemstate'} =~ /^CANNOT_ANSWER/) {
372: if ( ! ($env{'form.problemstate'} eq 'CANNOT_ANSWER_correct' &&
373: lc($Apache::lonhomework::problemstatus) eq 'no')) {
374: return ('CANNOT_ANSWER',
375: &mt('is in this state due to author settings.'));
376: }
377: } else {
378: return ($env{'form.problemstate'},
379: &mt('is in this state due to author settings.'));
380: }
381: }
382: &Apache::lonxml::debug("in construction ignoring dates");
383: $status='CAN_ANSWER';
384: $datemsg=&mt('is in under construction');
385: # return ($status,$datemsg);
386: }
387:
388: &Apache::lonxml::debug("checking for part :$id:");
389: &Apache::lonxml::debug("time:".time);
390:
391: my ($symb)=&Apache::lonxml::whichuser();
392: &Apache::lonxml::debug("symb:".$symb);
393: #if ($env{'request.state'} ne "construct" && $symb ne '') {
394: if ($env{'request.state'} ne "construct") {
395: my $allowed=&check_ip_acc(&Apache::lonnet::EXT("resource.$id.acc"));
396: if (!$allowed && ($Apache::lonhomework::browse ne 'F')) {
397: $status='INVALID_ACCESS';
398: $date=&mt("can not be accessed from your location.");
399: return($status,$date);
400: }
401:
402: foreach my $temp ("opendate","duedate","answerdate") {
403: $lastdate = $date;
404: if ($temp eq 'duedate') {
405: $date = &due_date($id);
406: } else {
407: $date = &Apache::lonnet::EXT("resource.$id.$temp");
408: }
409:
410: my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
411: if ($thistype =~ /^(con_lost|no_such_host)/ ||
412: $date =~ /^(con_lost|no_such_host)/) {
413: $status='UNAVAILABLE';
414: $date=&mt("may open later.");
415: return($status,$date);
416: }
417: if ($thistype eq 'date_interval') {
418: if ($temp eq 'opendate') {
419: $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
420: }
421: if ($temp eq 'answerdate') {
422: $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
423: }
424: }
425: &Apache::lonxml::debug("found :$date: for :$temp:");
426: if ($date eq '') {
427: $date = &mt("an unknown date"); $passed = 0;
428: } elsif ($date eq 'con_lost') {
429: $date = &mt("an indeterminate date"); $passed = 0;
430: } else {
431: if (time < $date) { $passed = 0; } else { $passed = 1; }
432: $date = localtime $date;
433: }
434: if (!$passed) { $type=$temp; last; }
435: }
436: &Apache::lonxml::debug("have :$type:$passed:");
437: if ($passed) {
438: $status='SHOW_ANSWER';
439: $datemsg=$date;
440: } elsif ($type eq 'opendate') {
441: $status='CLOSED';
442: $datemsg = &mt("will open on")." $date";
443: } elsif ($type eq 'duedate') {
444: $status='CAN_ANSWER';
445: $datemsg = &mt("is due at")." $date";
446: } elsif ($type eq 'answerdate') {
447: $status='CLOSED';
448: $datemsg = &mt("was due on")." $lastdate".&mt(", and answers will be available on")." $date";
449: }
450: }
451: if ($status eq 'CAN_ANSWER' ||
452: (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED'))) {
453: #check #tries, and if correct.
454: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
455: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
456: if ( $tries eq '' ) { $tries = '0'; }
457: if ( $maxtries eq '' &&
458: $env{'request.state'} ne 'construct') { $maxtries = '2'; }
459: if ($maxtries && $tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
460: # if (correct and show prob status) or excused then CANNOT_ANSWER
461: if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
462: &&
463: lc($Apache::lonhomework::problemstatus) ne 'no')
464: ||
465: $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
466: $status = 'CANNOT_ANSWER';
467: }
468: }
469: if ($status eq 'CAN_ANSWER' || $status eq 'CANNOT_ANSWER') {
470: my $interval=&Apache::lonnet::EXT("resource.$id.interval");
471: &Apache::lonxml::debug("looking for interval $interval");
472: if ($interval) {
473: my $first_access=&Apache::lonnet::get_first_access('map');
474: &Apache::lonxml::debug("looking for accesstime $first_access");
475: if (!$first_access) {
476: $status='NOT_YET_VIEWED';
477: my $due_date = &due_date($id);
478: $datemsg=&seconds_to_human_length($due_date-time);
479: }
480: }
481: }
482:
483: #if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
484: # (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
485: # return ('UNCHECKEDOUT','needs to be checked out');
486: #}
487:
488:
489: &Apache::lonxml::debug("sending back :$status:$datemsg:");
490: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
491: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
492: $status='CAN_ANSWER';
493: $datemsg=&mt('is closed but you are allowed to view it');
494: }
495:
496: return ($status,$datemsg);
497: }
498: # this should work exactly like the copy in lonnavmaps.pm
499: sub due_date {
500: my ($part_id,$symb,$udom,$uname)=@_;
501: my $date;
502: my $interval= &Apache::lonnet::EXT("resource.$part_id.interval",$symb,
503: $udom,$uname);
504: &Apache::lonxml::debug("looking for interval $part_id $symb $interval");
505: my $due_date= &Apache::lonnet::EXT("resource.$part_id.duedate",$symb,
506: $udom,$uname);
507: &Apache::lonxml::debug("looking for due_date $part_id $symb $due_date");
508: if (defined($interval)) {
509: my $first_access=&Apache::lonnet::get_first_access('map',$symb);
510: if (defined($first_access)) {
511: $interval = $first_access+$interval;
512: $date = ($interval < $due_date)? $interval : $due_date;
513: } else {
514: $date = $due_date;
515: }
516: } else {
517: $date = $due_date;
518: }
519: return $date
520: }
521:
522: sub seconds_to_human_length {
523: my ($length)=@_;
524:
525: my $seconds=$length%60; $length=int($length/60);
526: my $minutes=$length%60; $length=int($length/60);
527: my $hours=$length%24; $length=int($length/24);
528: my $days=$length;
529:
530: my $timestr;
531: if ($days > 0) { $timestr.=&mt('[quant,_1,day]',$days); }
532: if ($hours > 0) { $timestr.=($timestr?", ":"").
533: &mt('[quant,_1,hour]',$hours); }
534: if ($minutes > 0) { $timestr.=($timestr?", ":"").
535: &mt('[quant,_1,minute]',$minutes); }
536: if ($seconds > 0) { $timestr.=($timestr?", ":"").
537: &mt('[quant,_1,second]',$seconds); }
538: return $timestr;
539: }
540:
541: sub showhash {
542: my (%hash) = @_;
543: &showhashsubset(\%hash,'.');
544: return '';
545: }
546:
547: sub showarray {
548: my ($array)=@_;
549: my $string="(";
550: foreach my $elm (@{ $array }) {
551: if (ref($elm) eq 'ARRAY') {
552: $string.=&showarray($elm);
553: } elsif (ref($elm) eq 'HASH') {
554: $string.= "HASH --- \n<br />";
555: $string.= &showhashsubset($elm,'.');
556: } else {
557: $string.="$elm,"
558: }
559: }
560: chop($string);
561: $string.=")";
562: return $string;
563: }
564:
565: sub showhashsubset {
566: my ($hash,$keyre) = @_;
567: my $resultkey;
568: foreach $resultkey (sort keys %$hash) {
569: if ($resultkey !~ /$keyre/) { next; }
570: if (ref($$hash{$resultkey}) eq 'ARRAY' ) {
571: &Apache::lonxml::debug("$resultkey ---- ".
572: &showarray($$hash{$resultkey}));
573: } elsif (ref($$hash{$resultkey}) eq 'HASH' ) {
574: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
575: &showhashsubset($$hash{$resultkey},'.');
576: } else {
577: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
578: }
579: }
580: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
581: return '';
582: }
583:
584: sub setuppermissions {
585: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$env{'request.filename'});
586: my $viewgrades = &Apache::lonnet::allowed('vgr',$env{'request.course.id'});
587: if (! $viewgrades &&
588: exists($env{'request.course.sec'}) &&
589: $env{'request.course.sec'} !~ /^\s*$/) {
590: $viewgrades = &Apache::lonnet::allowed('vgr',$env{'request.course.id'}.
591: '/'.$env{'request.course.sec'});
592: }
593: $Apache::lonhomework::viewgrades = $viewgrades;
594:
595: if ($Apache::lonhomework::browse eq 'F' &&
596: $env{'form.devalidatecourseresdata'} eq 'on') {
597: my (undef,$courseid) = &Apache::lonxml::whichuser();
598: &Apache::lonnet::devalidatecourseresdata($env{"course.$courseid.num"},
599: $env{"course.$courseid.domain"});
600: }
601:
602: my $modifygrades = &Apache::lonnet::allowed('mgr',$env{'request.course.id'});
603: if (! $modifygrades &&
604: exists($env{'request.course.sec'}) &&
605: $env{'request.course.sec'} !~ /^\s*$/) {
606: $modifygrades =
607: &Apache::lonnet::allowed('mgr',$env{'request.course.id'}.
608: '/'.$env{'request.course.sec'});
609: }
610: $Apache::lonhomework::modifygrades = $modifygrades;
611:
612: my $queuegrade = &Apache::lonnet::allowed('mqg',$env{'request.course.id'});
613: if (! $queuegrade &&
614: exists($env{'request.course.sec'}) &&
615: $env{'request.course.sec'} !~ /^\s*$/) {
616: $queuegrade =
617: &Apache::lonnet::allowed('qgr',$env{'request.course.id'}.
618: '/'.$env{'request.course.sec'});
619: }
620: $Apache::lonhomework::queuegrade = $queuegrade;
621: return '';
622: }
623:
624: sub setupheader {
625: my $request=$_[0];
626: &Apache::loncommon::content_type($request,'text/html');
627: if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
628: &Apache::loncommon::no_cache($request);
629: }
630: # $request->set_last_modified(&Apache::lonnet::metadata($request->uri,
631: # 'lastrevisiondate'));
632: $request->send_http_header;
633: return OK if $request->header_only;
634: return ''
635: }
636:
637: sub handle_save_or_undo {
638: my ($request,$problem,$result) = @_;
639: my $file = &Apache::lonnet::filelocation("",$request->uri);
640: my $filebak =$file.".bak";
641: my $filetmp =$file.".tmp";
642: my $error=0;
643:
644: &Apache::lonnet::correct_line_ends($result);
645:
646: if ($env{'form.Undo'} eq &mt('undo')) {
647: my $error=0;
648: if (!copy($file,$filetmp)) { $error=1; }
649: if ((!$error) && (!copy($filebak,$file))) { $error=1; }
650: if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
651: if (!$error) {
652: &Apache::lonxml::info("<p><b>".&mt("Undid changes, Switched")." $filebak ".&mt("and")." $file</b></p>");
653: } else {
654: &Apache::lonxml::info("<p><font color=\"red\" size=\"+1\"><b>".&mt("Unable to undo, unable to switch")." $filebak ".&mt("and")." $file</b></font></p>");
655: $error=1;
656: }
657: } else {
658: my $fs=Apache::File->new(">$filebak");
659: if (defined($fs)) {
660: print $fs $$problem;
661: &Apache::lonxml::info("<b>".&mt("Making Backup to").
662: " $filebak</b>");
663: } else {
664: &Apache::lonxml::info("<font color=\"red\" size=\"+1\"><b>".&mt("Unable to make backup")." $filebak</b></font>");
665: $error=2;
666: }
667: my $fh=Apache::File->new(">$file");
668: if (defined($fh)) {
669: print $fh $$result;
670: &Apache::lonxml::info("<b>".&mt("Saving Modifications to").
671: " $file</b>");
672: } else {
673: &Apache::lonxml::info("<font color=\"red\" size=\"+1\"><b>".
674: &mt("Unable to write to")." $file</b></font>");
675: $error|=4;
676: }
677: }
678: return $error;
679: }
680:
681: sub analyze_header {
682: my ($request) = @_;
683: my $result =
684: &Apache::loncommon::start_page('Analyzing a problem',undef);
685:
686: $result .=
687: &Apache::lonxml::message_location().'
688: <form name="lonhomework" method="POST" action="'.
689: &HTML::Entities::encode($env{'request.uri'},'<>&"').'">'.
690: &Apache::structuretags::remember_problem_state().'
691: <input type="submit" name="problemmode" value="'.&mt("EditXML").'" />
692: <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
693: <hr />
694: <input type="submit" name="submit" value="'.&mt("View").'" />
695: <hr />
696: </form>';
697: &Apache::lonxml::add_messages(\$result);
698: $request->print($result);
699: $request->rflush();
700: }
701:
702: sub analyze_footer {
703: my ($request) = @_;
704: $request->print(&Apache::loncommon::end_page());
705: $request->rflush();
706: }
707:
708: sub analyze {
709: my ($request,$file) = @_;
710: &Apache::lonxml::debug("Analyze");
711: my $result;
712: my %overall;
713: my %seedexample;
714: my %allparts;
715: my $rndseed=$env{'form.rndseed'};
716: &analyze_header($request);
717: my %prog_state=
718: &Apache::lonhtmlcommon::Create_PrgWin($request,&mt('Analyze Progress'),
719: &mt('Getting Problem Variants'),
720: $env{'form.numtoanalyze'},
721: 'inline',undef);
722: for(my $i=1;$i<$env{'form.numtoanalyze'}+1;$i++) {
723: &Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
724: &mt('last problem'));
725: if (&Apache::loncommon::connection_aborted($request)) { return; }
726: my $thisseed=$i+$rndseed;
727: my $subresult=&Apache::lonnet::ssi($request->uri,
728: ('grade_target' => 'analyze'),
729: ('rndseed' => $thisseed));
730: (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
731: my %analyze=&Apache::lonnet::str2hash($subresult);
732: my @parts;
733: if (defined(@{ $analyze{'parts'} })) {
734: @parts=@{ $analyze{'parts'} };
735: }
736: foreach my $part (@parts) {
737: if (!exists($allparts{$part})) {$allparts{$part}=1;};
738: if ($analyze{$part.'.type'} eq 'numericalresponse' ||
739: $analyze{$part.'.type'} eq 'stringresponse' ||
740: $analyze{$part.'.type'} eq 'formularesponse' ) {
741: my $concatanswer=join("\0",@{ $analyze{$part.'.answer'} });
742: if (($concatanswer eq '') || ($concatanswer=~/^\@/)) {
743: @{$analyze{$part.'.answer'}}=('<font color="red">'.&mt('Error').'</font>');
744: }
745: push( @{ $overall{$part.'.answer'} },
746: [@{ $analyze{$part.'.answer'} }]);
747: $seedexample{join("\0",@{ $analyze{$part.'.answer'}})}=$thisseed;
748: }
749: }
750: }
751: &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
752: &mt('Analyzing Results'));
753: $request->print('<hr />'.&mt('List of possible answers').': ');
754: foreach my $part (sort(keys(%allparts))) {
755: if (defined(@{ $overall{$part.'.answer'} })) {
756: my $num_cols=scalar(@{ $overall{$part.'.answer'}->[0] });
757: $request->print('<table class="thinborder"><tr><th colspan="'.($num_cols+1).'">'.&mt('Part').' '.$part.'</th></tr>');
758: my %frequency;
759: foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
760: $frequency{join("\0",@{ $answer })}++;
761: }
762: $request->print('<tr><th colspan="'.($num_cols).'">'.&mt('Answer').'</th><th>'.&mt('Frequency').'<br />('
763: .&mt('click for example').')</th></tr>');
764: foreach my $answer (sort {(split("\0",$a))[0] <=> (split("\0",$b))[0]} (keys(%frequency))) {
765: $request->print('<tr><td class="center">'.
766: join('</td><td class="center">',split("\0",$answer)).
767: '</td><td class="center"><a href="'.$request->uri.'?rndseed='.$seedexample{$answer}.'">'.$frequency{$answer}.
768: '</a></td></tr>');
769: }
770: $request->print('</table>');
771: } else {
772: $request->print('<p>'.&mt('Response').' '.$part.' '.
773: &mt('is not analyzable at this time').'</p>');
774: }
775: }
776: if (scalar(keys(%allparts)) == 0 ) {
777: $request->print('<p>'.&mt('Found no analyzable responses in this problem, currently only Numerical, Formula and String response styles are supported.').'</p>');
778: }
779: &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
780: &analyze_footer($request);
781: &Apache::lonhomework::showhash(%overall);
782: return $result;
783: }
784:
785: sub editxmlmode {
786: my ($request,$file) = @_;
787: my $result;
788: my $problem=&Apache::lonnet::getfile($file);
789: if ($problem eq -1) {
790: &Apache::lonxml::error("<b> ".&mt('Unable to find').
791: " <i>$file</i></b>");
792: $problem='';
793: }
794: if (defined($env{'form.editxmltext'}) || defined($env{'form.Undo'})) {
795: my $error=&handle_save_or_undo($request,\$problem,
796: \$env{'form.editxmltext'});
797: if (!$error) { $problem=&Apache::lonnet::getfile($file); }
798: }
799: &Apache::lonhomework::showhashsubset(\%env,'^form');
800: if ( $env{'form.submit'} eq &mt('Submit Changes and View') ) {
801: &Apache::lonhomework::showhashsubset(\%env,'^form');
802: $env{'form.problemmode'}='View';
803: &renderpage($request,$file);
804: } else {
805: my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
806: my $xml_help = '<table><tr><td>'.
807: &Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
808: "Problem Editing Help").
809: '</td><td>'.
810: &Apache::loncommon::help_open_menu('',undef,undef,undef,5,'Authoring').
811: '</td></tr></table>';
812: if ($cols > 80) { $cols = 80; }
813: if ($cols < 70) { $cols = 70; }
814: if ($rows < 20) { $rows = 20; }
815: my $start_page =
816: &Apache::loncommon::start_page("EditXML $file",
817: &Apache::edit::js_change_detection());
818:
819: $result.=$start_page.
820: &renderpage($request,$file,['no_output_web'],1).
821: &Apache::lonxml::message_location().'
822: <form '.&Apache::edit::form_change_detection().' name="lonhomework" method="POST" action="'.
823: &HTML::Entities::encode($env{'request.uri'},'<>&"').'">'.
824: &Apache::structuretags::remember_problem_state().'
825: <input type="hidden" name="problemmode" value="'.&mt('EditXML').'" />
826: <input type="submit" name="problemmode" accesskey="d" value="'.&mt('Discard Edits and View').'" />
827: <input type="submit" '.&Apache::edit::submit_ask_anyway().'name="problemmode" accesskey="e" value="'.&mt('Edit').'" />
828: <input type="submit" name="Undo" accesskey="u" value="'.&mt('undo').'" />
829: <hr />
830: <input type="submit" name="submit" accesskey="s" value="'.&mt('Submit Changes').'" />
831: <input type="submit" name="submit" accesskey="v" value="'.&mt('Submit Changes and View').'" />
832: <hr />
833: ' . $xml_help . '
834: <textarea '.&Apache::edit::element_change_detection().' style="width:100%" rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
835: &HTML::Entities::encode($problem,'<>&"').'</textarea><br />
836: <input type="submit" name="submit" accesskey="s" value="'.&mt('Submit Changes').'" />
837: <input type="submit" name="submit" accesskey="v" value="'.&mt('Submit Changes and View').'" />
838: </form>'.&Apache::loncommon::end_page();
839: &Apache::lonxml::add_messages(\$result);
840: $request->print($result);
841: }
842: return '';
843: }
844:
845: #
846: # Render the page in whatever target desired.
847: #
848: sub renderpage {
849: my ($request,$file,$targets,$return_string) = @_;
850:
851: my @targets = @{$targets || [&get_target()]};
852: &Apache::lonhomework::showhashsubset(\%env,'form.');
853: &Apache::lonxml::debug("Running targets ".join(':',@targets));
854: my $overall_result;
855: foreach my $target (@targets) {
856: # FIXME need to do something intelligent when a problem goes
857: # from viewable to not viewable due to map conditions
858: #&setuppermissions();
859: #if ( $Apache::lonhomework::browse ne '2'
860: # && $Apache::lonhomework::browse ne 'F' ) {
861: # $request->print(" You most likely shouldn't see me.");
862: #}
863: #my $t0 = [&gettimeofday()];
864: my $output=1;
865: if ($target eq 'no_output_web') {
866: $target = 'web'; $output=0;
867: }
868: my $problem=&Apache::lonnet::getfile($file);
869: my $result;
870: if ($problem eq -1) {
871: my $filename=(split('/',$file))[-1];
872: $result.="<b> ".&mt('Unable to find')." <i>$filename</i></b>";
873: $problem='';
874: }
875:
876: my %mystyle;
877: if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
878: if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
879: if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%env,'^form');}
880:
881: &Apache::lonxml::debug("Should be parsing now");
882: $result .= &Apache::lonxml::xmlparse($request, $target, $problem,
883: &setup_vars($target),%mystyle);
884: undef($Apache::lonhomework::parsing_a_problem);
885: if (!$output) { $result = ''; }
886: #$request->print("Result follows:");
887: if ($target eq 'modified') {
888: &handle_save_or_undo($request,\$problem,\$result);
889: } else {
890: if ($target eq 'analyze') {
891: $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
892: undef(%Apache::lonhomework::analyze);
893: }
894: #my $td=&tv_interval($t0);
895: #if ( $Apache::lonxml::debug) {
896: #$result =~ s:</body>::;
897: #$result.="<br />Spent $td seconds processing target $target\n</body>";
898: #}
899: # $request->print($result);
900: $overall_result.=$result;
901: # $request->rflush();
902: }
903: #$request->print(":Result ends");
904: #my $td=&tv_interval($t0);
905: }
906: if (!$return_string) {
907: &Apache::lonxml::add_messages(\$overall_result);
908: $request->print($overall_result);
909: $request->rflush();
910: } else {
911: return $overall_result;
912: }
913: }
914:
915: # with no arg it returns a HTML <option> list of the template titles
916: # with one arg it returns the filename associated with the arg passed
917: sub get_template_list {
918: my ($namewanted,$extension) = @_;
919: my $result;
920: my @allnames;
921: &Apache::lonxml::debug("Looking for :$extension:");
922: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
923: my $name=&Apache::lonnet::metadata($file,'title');
924: if ($namewanted && ($name eq $namewanted)) {
925: $result=$file;
926: last;
927: } else {
928: if ($name) { push (@allnames, $name); }
929: }
930: }
931: if (@allnames && !$result) {
932: $result="<option>".&mt("Select a")." $extension ".&mt('template')."</option>\n<option>".
933: join('</option><option>',sort(@allnames)).'</option>';
934: }
935: return $result;
936: }
937:
938: sub newproblem {
939: my ($request) = @_;
940: my $extension=$request->uri;
941: $extension=~s:^.*\.([\w]+)$:$1:;
942: &Apache::lonxml::debug("Looking for :$extension:");
943: my $templatelist=&get_template_list('',$extension);
944: if ($env{'form.template'} &&
945: $env{'form.template'} ne "Select a $extension template") {
946: use File::Copy;
947: my $file = &get_template_list($env{'form.template'},$extension);
948: my $dest = &Apache::lonnet::filelocation("",$request->uri);
949: copy($file,$dest);
950: &renderpage($request,$dest);
951: } elsif($env{'form.newfile'} && !$templatelist) {
952: # I don't like hard-coded filenames but for now, this will work.
953: use File::Copy;
954: my $templatefilename =
955: $request->dir_config('lonIncludes').'/templates/blank.problem';
956: &Apache::lonxml::debug("$templatefilename");
957: my $dest = &Apache::lonnet::filelocation("",$request->uri);
958: copy($templatefilename,$dest);
959: &renderpage($request,$dest);
960: } else {
961: my $url=&HTML::Entities::encode($request->uri,'<>&"');
962: my $shownurl=$url;
963: $shownurl=~s-^/~-/priv/-;
964: my $dest = &Apache::lonnet::filelocation("",$request->uri);
965: my $errormsg;
966: if ($env{'form.newfile'}) {
967: $errormsg='<p><font color="red">'.&mt('You did not select a template.').'</font></p>'."\n";
968: }
969: my $instructions;
970: my $start_page =
971: &Apache::loncommon::start_page("Create New $extension");
972: if ($templatelist) { $instructions=&mt(", select a template from the pull-down menu below.").'<br />'.&mt("Then");}
973: my %lt=&Apache::lonlocal::texthash( 'create' => 'Creating a new',
974: 'resource' => 'resource',
975: 'requested' => 'The requested file',
976: 'not exist' => 'currently does not exist',
977: 'createnew' => 'To create a new',
978: 'click' => 'click on the',
979: 'Create' => 'Create',
980: 'button' => 'button');
981: $request->print(<<ENDNEWPROBLEM);
982: $start_page
983: <h1>$lt{'create'} $extension $lt{'resource'}</h1>
984: $errormsg
985: $lt{'requested'} <tt>$shownurl</tt> $lt{'not exist'}.
986: <p>
987: <b>$lt{'createnew'} $extension$instructions $lt{'click'} "$lt{'Create'} $extension" $lt{'button'}.</b>
988: </p>
989: <p><form action="$url" method="POST">
990: ENDNEWPROBLEM
991: if (defined($templatelist)) {
992: $request->print("<select name=\"template\">$templatelist</select>");
993: }
994: $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"".&mt('Create')." $extension\" />");
995: $request->print("</form></p>".&Apache::loncommon::end_page());
996: }
997: return '';
998: }
999:
1000: sub handler {
1001: #my $t0 = [&gettimeofday()];
1002: my $request=$_[0];
1003: $Apache::lonxml::request=$request;
1004: $Apache::lonxml::debug=$env{'user.debug'};
1005: $env{'request.uri'}=$request->uri;
1006: &setuppermissions();
1007: # some times multiple problemmodes are submitted, need to select
1008: # the last one
1009: if ( defined($env{'form.problemmode'}) && ref($env{'form.problemmode'}) ) {
1010: my $mode=$env{'form.problemmode'}->[-1];
1011: undef $env{'form.problemmode'};
1012: $env{'form.problemmode'}=$mode;
1013: }
1014:
1015: my $file=&Apache::lonnet::filelocation("",$request->uri);
1016:
1017: #check if we know where we are
1018: if ($env{'request.course.fn'} && !&Apache::lonnet::symbread()) {
1019: # if we are browsing we might not be able to know where we are
1020: if ($Apache::lonhomework::browse ne 'F' &&
1021: $env{'request.state'} ne "construct") {
1022: #should know where we are, so ask
1023: $request->internal_redirect('/adm/ambiguous'); return OK;
1024: }
1025: }
1026: if (&setupheader($request)) { return OK; }
1027: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:$Apache::lonhomework::modifygrades:$Apache::lonhomework::queuegrade");
1028: &Apache::lonxml::debug("Problem Mode ".$env{'form.problemmode'});
1029: my ($symb) = &Apache::lonxml::whichuser();
1030: &Apache::lonxml::debug('symb is '.$symb);
1031: if ($env{'request.state'} eq "construct") {
1032: if ( -e $file ) {
1033: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1034: ['problemmode']);
1035: if (!(defined $env{'form.problemmode'})) {
1036: #first visit to problem in construction space
1037: $env{'form.problemmode'}='View';
1038: &renderpage($request,$file);
1039: } elsif ($env{'form.problemmode'} eq &mt('EditXML') ||
1040: $env{'form.problemmode'} eq 'EditXML') {
1041: &editxmlmode($request,$file);
1042: } elsif ($env{'form.problemmode'} eq &mt('Calculate answers')) {
1043: &analyze($request,$file);
1044: } else {
1045: &renderpage($request,$file);
1046: }
1047: } else {
1048: # requested file doesn't exist in contruction space
1049: &newproblem($request);
1050: }
1051: } else {
1052: # just render the page normally outside of construction space
1053: &Apache::lonxml::debug("not construct");
1054: &renderpage($request,$file);
1055: }
1056: #my $td=&tv_interval($t0);
1057: #&Apache::lonxml::debug("Spent $td seconds processing");
1058: # always turn off debug messages
1059: $Apache::lonxml::debug=0;
1060: return OK;
1061:
1062: }
1063:
1064: 1;
1065: __END__
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