1: # The LearningOnline Network with CAPA
2: # The LON-CAPA Homework handler
3: #
4: # $Id: lonhomework.pm,v 1.266 2007/04/06 21:21:34 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($env{'form.newrandomization'}))) {
100: return ('grade', 'web');
101: } else {
102: return ('web');
103: }
104: } elsif ($env{'request.state'} eq "construct") {
105: if ( defined($env{'form.grade_target'}) ) {
106: return ($env{'form.grade_target'});
107: }
108: if ( defined($env{'form.preview'})) {
109: if ( defined($env{'form.submitted'})) {
110: return ('grade', 'web');
111: } else {
112: return ('web');
113: }
114: } else {
115: if ( $env{'form.problemmode'} eq &mt('View') ||
116: $env{'form.problemmode'} eq &mt('Discard Edits and View')) {
117: if ( defined($env{'form.submitted'}) &&
118: (!defined($env{'form.resetdata'})) &&
119: (!defined($env{'form.newrandomization'}))) {
120: return ('grade', 'web','answer');
121: } else {
122: return ('web','answer');
123: }
124: } elsif ( $env{'form.problemmode'} eq &mt('Edit') ||
125: $env{'form.problemmode'} eq 'Edit') {
126: if ( $env{'form.submitted'} eq 'edit' ) {
127: if ( $env{'form.submit'} eq &mt('Submit Changes and View') ) {
128: return ('modified','web','answer');
129: } else {
130: return ('modified','no_output_web','edit');
131: }
132: } else {
133: return ('no_output_web','edit');
134: }
135: } else {
136: return ('web');
137: }
138: }
139: }
140: return ();
141: }
142:
143: sub setup_vars {
144: my ($target) = @_;
145: return ';'
146: # return ';$external::target='.$target.';';
147: }
148:
149: sub createmenu {
150: my ($which,$request)=@_;
151: if ($which eq 'grade') {
152: $request->print('<script language="JavaScript">
153: hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
154: "height=350,width=150,menubar=no");
155: </script>');
156: }
157: }
158:
159: sub proctor_checked_in {
160: my ($slot_name,$slot,$type)=@_;
161: my @possible_proctors=split(",",$slot->{'proctor'});
162:
163: return 1 if (!@possible_proctors);
164:
165: my $key;
166: if ($type eq 'Task') {
167: my $version=$Apache::lonhomework::history{'resource.0.version'};
168: $key ="resource.$version.0.checkedin";
169: } elsif ($type eq 'problem') {
170: $key ='resource.0.checkedin';
171: }
172: # backward compatability, used to be username@domain,
173: # now is username:domain
174: my $who = $Apache::lonhomework::history{$key};
175: if ($who !~ /:/) {
176: $who =~ tr/@/:/;
177: }
178: foreach my $possible (@possible_proctors) {
179: if ($who eq $possible
180: && $Apache::lonhomework::history{$key.'.slot'} eq $slot_name) {
181: return 1;
182: }
183: }
184:
185: return 0;
186: }
187:
188: $Apache::lonxml::browse='';
189: sub check_ip_acc {
190: my ($acc)=@_;
191: &Apache::lonxml::debug("acc is $acc");
192: if (!defined($acc) || $acc =~ /^\s*$/ || $acc =~/^\s*no\s*$/i) {
193: return 1;
194: }
195: my $allowed=0;
196: my $ip=$ENV{'REMOTE_ADDR'};
197: my $name;
198: foreach my $pattern (split(',',$acc)) {
199: $pattern =~ s/^\s*//;
200: $pattern =~ s/\s*$//;
201: if ($pattern =~ /\*$/) {
202: #35.8.*
203: $pattern=~s/\*//;
204: if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
205: } elsif ($pattern =~ /(\d+\.\d+\.\d+)\.\[(\d+)-(\d+)\]$/) {
206: #35.8.3.[34-56]
207: my $low=$2;
208: my $high=$3;
209: $pattern=$1;
210: if ($ip =~ /^\Q$pattern\E/) {
211: my $last=(split(/\./,$ip))[3];
212: if ($last <=$high && $last >=$low) { $allowed=1; }
213: }
214: } elsif ($pattern =~ /^\*/) {
215: #*.msu.edu
216: $pattern=~s/\*//;
217: if (!defined($name)) {
218: use Socket;
219: my $netaddr=inet_aton($ip);
220: ($name)=gethostbyaddr($netaddr,AF_INET);
221: }
222: if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
223: } elsif ($pattern =~ /\d+\.\d+\.\d+\.\d+/) {
224: #127.0.0.1
225: if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
226: } else {
227: #some.name.com
228: if (!defined($name)) {
229: use Socket;
230: my $netaddr=inet_aton($ip);
231: ($name)=gethostbyaddr($netaddr,AF_INET);
232: }
233: if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
234: }
235: if ($allowed) { last; }
236: }
237: return $allowed;
238: }
239:
240: sub check_slot_access {
241: my ($id,$type)=@_;
242:
243: # does it pass normal muster
244: my ($status,$datemsg)=&check_access($id);
245:
246: my $useslots = &Apache::lonnet::EXT("resource.0.useslots");
247: if ($useslots ne 'resource' && $useslots ne 'map'
248: && $useslots ne 'map_map') {
249: return ($status,$datemsg);
250: }
251:
252: if ($status eq 'SHOW_ANSWER' ||
253: $status eq 'CLOSED' ||
254: $status eq 'INVALID_ACCESS' ||
255: $status eq 'UNAVAILABLE') {
256: return ($status,$datemsg);
257: }
258: if ($env{'request.state'} eq "construct") {
259: return ($status,$datemsg);
260: }
261:
262: if ($type eq 'Task') {
263: my $version=$Apache::lonhomework::history{'resource.version'};
264: if ($Apache::lonhomework::history{"resource.$version.0.checkedin"} &&
265: $Apache::lonhomework::history{"resource.$version.0.status"} eq 'pass') {
266: return ('SHOW_ANSWER');
267: }
268: }
269:
270: my @slots=
271: (split(':',&Apache::lonnet::EXT("resource.0.availablestudent")),
272: split(':',&Apache::lonnet::EXT("resource.0.available")));
273:
274: # if (!@slots) {
275: # return ($status,$datemsg);
276: # }
277: my $slotstatus='NOT_IN_A_SLOT';
278: my ($returned_slot,$slot_name);
279: foreach my $slot (@slots) {
280: $slot =~ s/(^\s*|\s*$)//g;
281: &Apache::lonxml::debug("getting $slot");
282: my %slot=&Apache::lonnet::get_slot($slot);
283: &Apache::lonhomework::showhash(%slot);
284: if ($slot{'starttime'} < time &&
285: $slot{'endtime'} > time &&
286: &check_ip_acc($slot{'ip'})) {
287: &Apache::lonxml::debug("$slot is good");
288: $slotstatus='NEEDS_CHECKIN';
289: $returned_slot=\%slot;
290: $slot_name=$slot;
291: last;
292: }
293: }
294: if ($slotstatus eq 'NEEDS_CHECKIN' &&
295: &proctor_checked_in($slot_name,$returned_slot,$type)) {
296: &Apache::lonxml::debug("protoctor checked in");
297: $slotstatus='CAN_ANSWER';
298: }
299:
300: my ($is_correct,$got_grade,$checkedin);
301: if ($type eq 'Task') {
302: my $version=$Apache::lonhomework::history{'resource.0.version'};
303: $got_grade =
304: ($Apache::lonhomework::history{"resource.$version.0.status"}
305: =~ /^(?:pass|fail)$/);
306: $is_correct =
307: ($Apache::lonhomework::history{"resource.$version.0.status"} eq 'pass'
308: || $Apache::lonhomework::history{"resource.0.solved"} =~ /^correct_/ );
309: $checkedin =
310: $Apache::lonhomework::history{"resource.$version.0.checkedin"};
311: } elsif ($type eq 'problem') {
312: $got_grade = 1;
313: $checkedin = $Apache::lonhomework::history{"resource.0.checkedin"};
314: $is_correct =
315: ($Apache::lonhomework::history{"resource.0.solved"} =~/^correct_/);
316: }
317:
318: &Apache::lonxml::debug(" slot is $slotstatus checkedin ($checkedin) got_grade ($got_grade) is_correct ($is_correct)");
319:
320: # no slot is currently open, and has been checked in for this version
321: # but hasn't got a grade, therefore must be awaiting a grade
322: if (!defined($slot_name)
323: && $checkedin
324: && !$got_grade) {
325: return ('WAITING_FOR_GRADE');
326: }
327:
328: # no slot is currently open, and has been checked in for this version
329: # previous slot is therefore CLOSED, so therefore the problem is
330: if (!defined($slot_name)
331: && $checkedin
332: && $type eq 'problem') {
333: return ('CLOSED',$datemsg);
334: }
335:
336: if ($slotstatus eq 'NOT_IN_A_SLOT'
337: && $checkedin ) {
338:
339: if ($got_grade) {
340: return ('SHOW_ANSWER');
341: } else {
342: return ('WAITING_FOR_GRADE');
343: }
344:
345: }
346:
347: if ( $is_correct) {
348: if ($type eq 'problem') {
349: return ($status);
350: }
351: return ('SHOW_ANSWER');
352: }
353:
354: if ( $status eq 'CANNOT_ANSWER' &&
355: ($slotstatus ne 'NEEDS_CHECKIN' && $slotstatus ne 'NOT_IN_A_SLOT')) {
356: return ($status,$datemsg);
357: }
358:
359: return ($slotstatus,$datemsg,$slot_name,$returned_slot);
360: }
361:
362: # JB, 9/24/2002: Any changes in this function may require a change
363: # in lonnavmaps::resource::getDateStatus.
364: sub check_access {
365: my ($id) = @_;
366: my $date ='';
367: my $status;
368: my $datemsg = '';
369: my $lastdate = '';
370: my $type;
371: my $passed;
372:
373: if ($env{'request.state'} eq "construct") {
374: if ($env{'form.problemstate'}) {
375: if ($env{'form.problemstate'} =~ /^CANNOT_ANSWER/) {
376: if ( ! ($env{'form.problemstate'} eq 'CANNOT_ANSWER_correct' &&
377: lc($Apache::lonhomework::problemstatus) eq 'no')) {
378: return ('CANNOT_ANSWER',
379: &mt('is in this state due to author settings.'));
380: }
381: } else {
382: return ($env{'form.problemstate'},
383: &mt('is in this state due to author settings.'));
384: }
385: }
386: &Apache::lonxml::debug("in construction ignoring dates");
387: $status='CAN_ANSWER';
388: $datemsg=&mt('is in under construction');
389: # return ($status,$datemsg);
390: }
391:
392: &Apache::lonxml::debug("checking for part :$id:");
393: &Apache::lonxml::debug("time:".time);
394:
395: my ($symb)=&Apache::lonnet::whichuser();
396: &Apache::lonxml::debug("symb:".$symb);
397: #if ($env{'request.state'} ne "construct" && $symb ne '') {
398: if ($env{'request.state'} ne "construct") {
399: my $allowed=&check_ip_acc(&Apache::lonnet::EXT("resource.$id.acc"));
400: if (!$allowed && ($Apache::lonhomework::browse ne 'F')) {
401: $status='INVALID_ACCESS';
402: $date=&mt("can not be accessed from your location.");
403: return($status,$date);
404: }
405:
406: foreach my $temp ("opendate","duedate","answerdate") {
407: $lastdate = $date;
408: if ($temp eq 'duedate') {
409: $date = &due_date($id);
410: } else {
411: $date = &Apache::lonnet::EXT("resource.$id.$temp");
412: }
413:
414: my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
415: if ($thistype =~ /^(con_lost|no_such_host)/ ||
416: $date =~ /^(con_lost|no_such_host)/) {
417: $status='UNAVAILABLE';
418: $date=&mt("may open later.");
419: return($status,$date);
420: }
421: if ($thistype eq 'date_interval') {
422: if ($temp eq 'opendate') {
423: $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
424: }
425: if ($temp eq 'answerdate') {
426: $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
427: }
428: }
429: &Apache::lonxml::debug("found :$date: for :$temp:");
430: if ($date eq '') {
431: $date = &mt("an unknown date"); $passed = 0;
432: } elsif ($date eq 'con_lost') {
433: $date = &mt("an indeterminate date"); $passed = 0;
434: } else {
435: if (time < $date) { $passed = 0; } else { $passed = 1; }
436: $date = localtime $date;
437: }
438: if (!$passed) { $type=$temp; last; }
439: }
440: &Apache::lonxml::debug("have :$type:$passed:");
441: if ($passed) {
442: $status='SHOW_ANSWER';
443: $datemsg=$date;
444: } elsif ($type eq 'opendate') {
445: $status='CLOSED';
446: $datemsg = &mt("will open on")." $date";
447: } elsif ($type eq 'duedate') {
448: $status='CAN_ANSWER';
449: $datemsg = &mt("is due at")." $date";
450: } elsif ($type eq 'answerdate') {
451: $status='CLOSED';
452: $datemsg = &mt("was due on")." $lastdate".&mt(", and answers will be available on")." $date";
453: }
454: }
455: if ($status eq 'CAN_ANSWER' ||
456: (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED'))) {
457: #check #tries, and if correct.
458: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
459: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
460: if ( $tries eq '' ) { $tries = '0'; }
461: if ( $maxtries eq '' &&
462: $env{'request.state'} ne 'construct') { $maxtries = '2'; }
463: if ($maxtries && $tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
464: # if (correct and show prob status) or excused then CANNOT_ANSWER
465: if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
466: &&
467: lc($Apache::lonhomework::problemstatus) ne 'no')
468: ||
469: $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
470: $status = 'CANNOT_ANSWER';
471: }
472: }
473: if ($status eq 'CAN_ANSWER' || $status eq 'CANNOT_ANSWER') {
474: my $interval=&Apache::lonnet::EXT("resource.$id.interval");
475: &Apache::lonxml::debug("looking for interval $interval");
476: if ($interval) {
477: my $first_access=&Apache::lonnet::get_first_access('map');
478: &Apache::lonxml::debug("looking for accesstime $first_access");
479: if (!$first_access) {
480: $status='NOT_YET_VIEWED';
481: my $due_date = &due_date($id);
482: my $seconds_left = $due_date - time;
483: if ($seconds_left > $interval || $due_date eq '') {
484: $seconds_left = $interval;
485: }
486: $datemsg=&seconds_to_human_length($seconds_left);
487: }
488: }
489: }
490:
491: #if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
492: # (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
493: # return ('UNCHECKEDOUT','needs to be checked out');
494: #}
495:
496:
497: &Apache::lonxml::debug("sending back :$status:$datemsg:");
498: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
499: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
500: $status='CAN_ANSWER';
501: $datemsg=&mt('is closed but you are allowed to view it');
502: }
503:
504: return ($status,$datemsg);
505: }
506: # this should work exactly like the copy in lonnavmaps.pm
507: sub due_date {
508: my ($part_id,$symb,$udom,$uname)=@_;
509: my $date;
510: my $interval= &Apache::lonnet::EXT("resource.$part_id.interval",$symb,
511: $udom,$uname);
512: &Apache::lonxml::debug("looking for interval $part_id $symb $interval");
513: my $due_date= &Apache::lonnet::EXT("resource.$part_id.duedate",$symb,
514: $udom,$uname);
515: &Apache::lonxml::debug("looking for due_date $part_id $symb $due_date");
516: if ($interval =~ /\d+/) {
517: my $first_access=&Apache::lonnet::get_first_access('map',$symb);
518: &Apache::lonxml::debug("looking for first_access $first_access");
519: if (defined($first_access)) {
520: $interval = $first_access+$interval;
521: $date = ($interval < $due_date)? $interval : $due_date;
522: } else {
523: $date = $due_date;
524: }
525: } else {
526: $date = $due_date;
527: }
528: return $date
529: }
530:
531: sub seconds_to_human_length {
532: my ($length)=@_;
533:
534: my $seconds=$length%60; $length=int($length/60);
535: my $minutes=$length%60; $length=int($length/60);
536: my $hours=$length%24; $length=int($length/24);
537: my $days=$length;
538:
539: my $timestr;
540: if ($days > 0) { $timestr.=&mt('[quant,_1,day]',$days); }
541: if ($hours > 0) { $timestr.=($timestr?", ":"").
542: &mt('[quant,_1,hour]',$hours); }
543: if ($minutes > 0) { $timestr.=($timestr?", ":"").
544: &mt('[quant,_1,minute]',$minutes); }
545: if ($seconds > 0) { $timestr.=($timestr?", ":"").
546: &mt('[quant,_1,second]',$seconds); }
547: return $timestr;
548: }
549:
550: sub showhash {
551: my (%hash) = @_;
552: &showhashsubset(\%hash,'.');
553: return '';
554: }
555:
556: sub showarray {
557: my ($array)=@_;
558: my $string="(";
559: foreach my $elm (@{ $array }) {
560: if (ref($elm) eq 'ARRAY') {
561: $string.=&showarray($elm);
562: } elsif (ref($elm) eq 'HASH') {
563: $string.= "HASH --- \n<br />";
564: $string.= &showhashsubset($elm,'.');
565: } else {
566: $string.="$elm,"
567: }
568: }
569: chop($string);
570: $string.=")";
571: return $string;
572: }
573:
574: sub showhashsubset {
575: my ($hash,$keyre) = @_;
576: my $resultkey;
577: foreach $resultkey (sort keys %$hash) {
578: if ($resultkey !~ /$keyre/) { next; }
579: if (ref($$hash{$resultkey}) eq 'ARRAY' ) {
580: &Apache::lonxml::debug("$resultkey ---- ".
581: &showarray($$hash{$resultkey}));
582: } elsif (ref($$hash{$resultkey}) eq 'HASH' ) {
583: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
584: &showhashsubset($$hash{$resultkey},'.');
585: } else {
586: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
587: }
588: }
589: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
590: return '';
591: }
592:
593: sub setuppermissions {
594: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$env{'request.filename'});
595: my $viewgrades = &Apache::lonnet::allowed('vgr',$env{'request.course.id'});
596: if (! $viewgrades &&
597: exists($env{'request.course.sec'}) &&
598: $env{'request.course.sec'} !~ /^\s*$/) {
599: $viewgrades = &Apache::lonnet::allowed('vgr',$env{'request.course.id'}.
600: '/'.$env{'request.course.sec'});
601: }
602: $Apache::lonhomework::viewgrades = $viewgrades;
603:
604: if ($Apache::lonhomework::browse eq 'F' &&
605: $env{'form.devalidatecourseresdata'} eq 'on') {
606: my (undef,$courseid) = &Apache::lonnet::whichuser();
607: &Apache::lonnet::devalidatecourseresdata($env{"course.$courseid.num"},
608: $env{"course.$courseid.domain"});
609: }
610:
611: my $modifygrades = &Apache::lonnet::allowed('mgr',$env{'request.course.id'});
612: if (! $modifygrades &&
613: exists($env{'request.course.sec'}) &&
614: $env{'request.course.sec'} !~ /^\s*$/) {
615: $modifygrades =
616: &Apache::lonnet::allowed('mgr',$env{'request.course.id'}.
617: '/'.$env{'request.course.sec'});
618: }
619: $Apache::lonhomework::modifygrades = $modifygrades;
620:
621: my $queuegrade = &Apache::lonnet::allowed('mqg',$env{'request.course.id'});
622: if (! $queuegrade &&
623: exists($env{'request.course.sec'}) &&
624: $env{'request.course.sec'} !~ /^\s*$/) {
625: $queuegrade =
626: &Apache::lonnet::allowed('qgr',$env{'request.course.id'}.
627: '/'.$env{'request.course.sec'});
628: }
629: $Apache::lonhomework::queuegrade = $queuegrade;
630: return '';
631: }
632:
633: sub unset_permissions {
634: undef($Apache::lonhomework::queuegrade);
635: undef($Apache::lonhomework::modifygrades);
636: undef($Apache::lonhomework::viewgrades);
637: undef($Apache::lonhomework::browse);
638: }
639:
640: sub setupheader {
641: my $request=$_[0];
642: &Apache::loncommon::content_type($request,'text/html');
643: if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
644: &Apache::loncommon::no_cache($request);
645: }
646: # $request->set_last_modified(&Apache::lonnet::metadata($request->uri,
647: # 'lastrevisiondate'));
648: $request->send_http_header;
649: return OK if $request->header_only;
650: return ''
651: }
652:
653: sub handle_save_or_undo {
654: my ($request,$problem,$result) = @_;
655: my $file = &Apache::lonnet::filelocation("",$request->uri);
656: my $filebak =$file.".bak";
657: my $filetmp =$file.".tmp";
658: my $error=0;
659: if ($env{'form.Undo'} eq &mt('undo')) {
660: my $error=0;
661: if (!copy($file,$filetmp)) { $error=1; }
662: if ((!$error) && (!copy($filebak,$file))) { $error=1; }
663: if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
664: if (!$error) {
665: &Apache::lonxml::info("<p><b>".
666: &mt("Undid changes, Switched [_1] and [_2]",
667: '<span class="LC_filename">'.$filebak.
668: '</span>',
669: '<span class="LC_filename">'.$file.
670: '</span>')."</b></p>");
671: } else {
672: &Apache::lonxml::info("<p><span class=\"LC_error\">".
673: &mt("Unable to undo, unable to switch [_1] and [_2]",
674: '<span class="LC_filename">'.
675: $filebak.'</span>',
676: '<span class="LC_filename">'.
677: $file.'</span>')."</span></p>");
678: $error=1;
679: }
680: } else {
681: &Apache::lonnet::correct_line_ends($result);
682: my $fs=Apache::File->new(">$filebak");
683: if (defined($fs)) {
684: print $fs $$problem;
685: &Apache::lonxml::info("<b>".&mt("Making Backup to [_1]",
686: '<span class="LC_filename">'.
687: $filebak.'</span>').
688: "</b>");
689: } else {
690: &Apache::lonxml::info("<span class=\"LC_error\">".
691: &mt("Unable to make backup [_1]",
692: '<span class="LC_filename">'.
693: $filebak.'</span>')."</span>");
694: $error=2;
695: }
696: my $fh=Apache::File->new(">$file");
697: if (defined($fh)) {
698: print $fh $$result;
699: &Apache::lonxml::info("<b>".&mt("Saving Modifications to [_1]",
700: '<span class="LC_filename">'.
701: $file.'</span>' )."</b>");
702: } else {
703: &Apache::lonxml::info('<span class="LC_error">'.
704: &mt("Unable to write to [_1]",
705: '<span class="LC_filename">'.
706: $file.'</span>').
707: '</span>');
708: $error|=4;
709: }
710: }
711: return $error;
712: }
713:
714: sub analyze_header {
715: my ($request) = @_;
716: my $result =
717: &Apache::loncommon::start_page('Analyzing a problem',undef);
718:
719: $result .=
720: &Apache::lonxml::message_location().'
721: <form name="lonhomework" method="POST" action="'.
722: &HTML::Entities::encode($env{'request.uri'},'<>&"').'">'.
723: &Apache::structuretags::remember_problem_state().'
724: <input type="submit" name="problemmode" value="'.&mt("EditXML").'" />
725: <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
726: <hr />
727: <input type="submit" name="submit" value="'.&mt("View").'" />
728: <hr />
729: </form>';
730: &Apache::lonxml::add_messages(\$result);
731: $request->print($result);
732: $request->rflush();
733: }
734:
735: sub analyze_footer {
736: my ($request) = @_;
737: $request->print(&Apache::loncommon::end_page());
738: $request->rflush();
739: }
740:
741: sub analyze {
742: my ($request,$file) = @_;
743: &Apache::lonxml::debug("Analyze");
744: my $result;
745: my %overall;
746: my %seedexample;
747: my %allparts;
748: my $rndseed=$env{'form.rndseed'};
749: &analyze_header($request);
750: my %prog_state=
751: &Apache::lonhtmlcommon::Create_PrgWin($request,&mt('Analyze Progress'),
752: &mt('Getting Problem Variants'),
753: $env{'form.numtoanalyze'},
754: 'inline',undef);
755: for(my $i=1;$i<$env{'form.numtoanalyze'}+1;$i++) {
756: &Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
757: &mt('last problem'));
758: if (&Apache::loncommon::connection_aborted($request)) { return; }
759: my $thisseed=$i+$rndseed;
760: my $subresult=&Apache::lonnet::ssi($request->uri,
761: ('grade_target' => 'analyze'),
762: ('rndseed' => $thisseed));
763: (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
764: my %analyze=&Apache::lonnet::str2hash($subresult);
765: my @parts;
766: if (defined(@{ $analyze{'parts'} })) {
767: @parts=@{ $analyze{'parts'} };
768: }
769: foreach my $part (@parts) {
770: if (!exists($allparts{$part})) {$allparts{$part}=1;};
771: if ($analyze{$part.'.type'} eq 'numericalresponse' ||
772: $analyze{$part.'.type'} eq 'stringresponse' ||
773: $analyze{$part.'.type'} eq 'formularesponse' ) {
774: foreach my $name (keys(%{ $analyze{$part.'.answer'} })) {
775: my $i=0;
776: foreach my $answer_part (@{ $analyze{$part.'.answer'}{$name} }) {
777: push( @{ $overall{$part.'.answer'}[$i] },
778: $answer_part);
779: my $concatanswer= join("\0",@{ $answer_part });
780: if (($concatanswer eq '') || ($concatanswer=~/^\@/)) {
781: $answer_part = ['<span class="LC_error">'.&mt('Error').'</span>'];
782: }
783: $seedexample{join("\0",$part,$i,@{$answer_part})}=
784: $thisseed;
785: $i++;
786: }
787: }
788: }
789: }
790: }
791: &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
792: &mt('Analyzing Results'));
793: $request->print('<hr />'.&mt('List of possible answers').': ');
794: foreach my $part (sort(keys(%allparts))) {
795: if (defined(@{ $overall{$part.'.answer'} })) {
796: for (my $i=0;$i<scalar(@{ $overall{$part.'.answer'} });$i++) {
797: my $num_cols=scalar(@{ $overall{$part.'.answer'}[$i][0] });
798: $request->print('<table class="thinborder"><tr><th colspan="'.($num_cols+1).'">'.&mt('Part').' '.$part);
799: if (scalar(@{ $overall{$part.'.answer'} }) > 1) {
800: $request->print(&mt(' Answer [_1]',$i+1));
801: }
802: $request->print('</th></tr>');
803: my %frequency;
804: foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'}[$i] })) {
805: $frequency{join("\0",@{ $answer })}++;
806: }
807: $request->print('<tr><th colspan="'.($num_cols).'">'.&mt('Answer').'</th><th>'.&mt('Frequency').'<br />('
808: .&mt('click for example').')</th></tr>');
809: foreach my $answer (sort {(split("\0",$a))[0] <=> (split("\0",$b))[0]} (keys(%frequency))) {
810: $request->print('<tr><td class="center">'.
811: join('</td><td class="center">',split("\0",$answer)).
812: '</td><td class="center"><a href="'.$request->uri.'?rndseed='.$seedexample{join("\0",$part,$i,$answer)}.'">'.$frequency{$answer}.
813: '</a></td></tr>');
814: }
815: $request->print('</table>');
816: }
817: } else {
818: $request->print('<p>'.&mt('Response').' '.$part.' '.
819: &mt('is not analyzable at this time').'</p>');
820: }
821: }
822: if (scalar(keys(%allparts)) == 0 ) {
823: $request->print('<p>'.&mt('Found no analyzable responses in this problem, currently only Numerical, Formula and String response styles are supported.').'</p>');
824: }
825: &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
826: &analyze_footer($request);
827: &Apache::lonhomework::showhash(%overall);
828: return $result;
829: }
830:
831: sub editxmlmode {
832: my ($request,$file) = @_;
833: my $result;
834: my $problem=&Apache::lonnet::getfile($file);
835: if ($problem eq -1) {
836: &Apache::lonxml::error("<b> ".&mt('Unable to find').
837: " <i>$file</i></b>");
838: $problem='';
839: }
840: if (defined($env{'form.editxmltext'}) || defined($env{'form.Undo'})) {
841: my $error=&handle_save_or_undo($request,\$problem,
842: \$env{'form.editxmltext'});
843: if (!$error) { $problem=&Apache::lonnet::getfile($file); }
844: }
845: &Apache::lonhomework::showhashsubset(\%env,'^form');
846: if ( $env{'form.submit'} eq &mt('Submit Changes and View') ) {
847: &Apache::lonhomework::showhashsubset(\%env,'^form');
848: $env{'form.problemmode'}='View';
849: &renderpage($request,$file);
850: } else {
851: my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
852: my $xml_help = '<table><tr><td>'.
853: &Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
854: "Problem Editing Help").
855: '</td><td>'.
856: &Apache::loncommon::help_open_menu(undef,undef,5,'Authoring').
857: '</td></tr></table>';
858: if ($cols > 80) { $cols = 80; }
859: if ($cols < 70) { $cols = 70; }
860: if ($rows < 20) { $rows = 20; }
861: my $start_page =
862: &Apache::loncommon::start_page(&mt("EditXML [_1]",$file),
863: &Apache::edit::js_change_detection(),
864: {'no_auto_mt_title' => 1,});
865:
866: $result.=$start_page.
867: &renderpage($request,$file,['no_output_web'],1).
868: &Apache::lonxml::message_location().'
869: <form '.&Apache::edit::form_change_detection().' name="lonhomework" method="POST" action="'.
870: &HTML::Entities::encode($env{'request.uri'},'<>&"').'">'.
871: &Apache::structuretags::remember_problem_state().'
872: <input type="hidden" name="problemmode" value="'.&mt('EditXML').'" />
873: <input type="submit" name="problemmode" accesskey="d" value="'.&mt('Discard Edits and View').'" />
874: <input type="submit" '.&Apache::edit::submit_ask_anyway().'name="problemmode" accesskey="e" value="'.&mt('Edit').'" />
875: <input type="submit" name="Undo" accesskey="u" value="'.&mt('undo').'" />
876: <hr />
877: <input type="submit" name="submit" accesskey="s" value="'.&mt('Submit Changes').'" />
878: <input type="submit" name="submit" accesskey="v" value="'.&mt('Submit Changes and View').'" />
879: <hr />
880: ' . $xml_help . '
881: <textarea '.&Apache::edit::element_change_detection().' style="width:100%" rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
882: &HTML::Entities::encode($problem,'<>&"').'</textarea><br />
883: <input type="submit" name="submit" accesskey="s" value="'.&mt('Submit Changes').'" />
884: <input type="submit" name="submit" accesskey="v" value="'.&mt('Submit Changes and View').'" />
885: </form>'.&Apache::loncommon::end_page();
886: &Apache::lonxml::add_messages(\$result);
887: $request->print($result);
888: }
889: return '';
890: }
891:
892: #
893: # Render the page in whatever target desired.
894: #
895: sub renderpage {
896: my ($request,$file,$targets,$return_string) = @_;
897:
898: my @targets = @{$targets || [&get_target()]};
899: &Apache::lonhomework::showhashsubset(\%env,'form.');
900: &Apache::lonxml::debug("Running targets ".join(':',@targets));
901: my $overall_result;
902: foreach my $target (@targets) {
903: # FIXME need to do something intelligent when a problem goes
904: # from viewable to not viewable due to map conditions
905: #&setuppermissions();
906: #if ( $Apache::lonhomework::browse ne '2'
907: # && $Apache::lonhomework::browse ne 'F' ) {
908: # $request->print(" You most likely shouldn't see me.");
909: #}
910: #my $t0 = [&gettimeofday()];
911: my $output=1;
912: if ($target eq 'no_output_web') {
913: $target = 'web'; $output=0;
914: }
915: my $problem=&Apache::lonnet::getfile($file);
916: my $result;
917: if ($problem eq -1) {
918: $problem='';
919: my $filename=(split('/',$file))[-1];
920: my $error =
921: "<b> ".&mt('Unable to find [_1]',
922: ' <span class="LC_filename">'.$filename.'</span>')
923: ."</b>";
924: $result.=
925: &Apache::loncommon::simple_error_page($request,'Not available',
926: $error);
927: return;
928: }
929:
930: my %mystyle;
931: if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
932: if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
933: if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%env,'^form');}
934:
935: &Apache::lonxml::debug("Should be parsing now");
936: $result .= &Apache::lonxml::xmlparse($request, $target, $problem,
937: &setup_vars($target),%mystyle);
938: undef($Apache::lonhomework::parsing_a_problem);
939: if (!$output) { $result = ''; }
940: #$request->print("Result follows:");
941: if ($target eq 'modified') {
942: &handle_save_or_undo($request,\$problem,\$result);
943: } else {
944: if ($target eq 'analyze') {
945: $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
946: undef(%Apache::lonhomework::analyze);
947: }
948: #my $td=&tv_interval($t0);
949: #if ( $Apache::lonxml::debug) {
950: #$result =~ s:</body>::;
951: #$result.="<br />Spent $td seconds processing target $target\n</body>";
952: #}
953: # $request->print($result);
954: $overall_result.=$result;
955: # $request->rflush();
956: }
957: #$request->print(":Result ends");
958: #my $td=&tv_interval($t0);
959: }
960: if (!$return_string) {
961: &Apache::lonxml::add_messages(\$overall_result);
962: $request->print($overall_result);
963: $request->rflush();
964: } else {
965: return $overall_result;
966: }
967: }
968:
969: # with no arg it returns a HTML <option> list of the template titles
970: # with one arg it returns the filename associated with the arg passed
971: sub get_template_list {
972: my ($namewanted,$extension) = @_;
973: my $result;
974: my @allnames;
975: &Apache::lonxml::debug("Looking for :$extension:");
976: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
977: my $name=&Apache::lonnet::metadata($file,'title');
978: if ($namewanted && ($name eq $namewanted)) {
979: $result=$file;
980: last;
981: } else {
982: if ($name) { push (@allnames, $name); }
983: }
984: }
985: if (@allnames && !$result) {
986: $result="<option>".&mt("Select a")." $extension ".&mt('template')."</option>\n<option>".
987: join('</option><option>',sort(@allnames)).'</option>';
988: }
989: return $result;
990: }
991:
992: sub newproblem {
993: my ($request) = @_;
994: my $extension=$request->uri;
995: $extension=~s:^.*\.([\w]+)$:$1:;
996: &Apache::lonxml::debug("Looking for :$extension:");
997: my $templatelist=&get_template_list('',$extension);
998: if ($env{'form.template'} &&
999: $env{'form.template'} ne "Select a $extension template") {
1000: use File::Copy;
1001: my $file = &get_template_list($env{'form.template'},$extension);
1002: my $dest = &Apache::lonnet::filelocation("",$request->uri);
1003: copy($file,$dest);
1004: &renderpage($request,$dest);
1005: } elsif($env{'form.newfile'} && !$templatelist) {
1006: # I don't like hard-coded filenames but for now, this will work.
1007: use File::Copy;
1008: my $templatefilename =
1009: $request->dir_config('lonIncludes').'/templates/blank.'.$extension;
1010: &Apache::lonxml::debug("$templatefilename");
1011: my $dest = &Apache::lonnet::filelocation("",$request->uri);
1012: copy($templatefilename,$dest);
1013: &renderpage($request,$dest);
1014: } else {
1015: my $url=&HTML::Entities::encode($request->uri,'<>&"');
1016: my $shownurl=$url;
1017: $shownurl=~s-^/~-/priv/-;
1018: my $dest = &Apache::lonnet::filelocation("",$request->uri);
1019: my $errormsg;
1020: if ($env{'form.newfile'}) {
1021: $errormsg='<p><span class="LC_error">'.&mt('You did not select a template.').'</span></p>'."\n";
1022: }
1023: my $instructions;
1024: my $start_page =
1025: &Apache::loncommon::start_page("Create New $extension");
1026: $request->print("
1027: $start_page
1028: <h1>".&mt("Creating a new $extension resource.")."</h1>
1029: $errormsg
1030: ".&mt("The requested file [_1] currently does not exist.",
1031: "<tt>$shownurl</tt>")."
1032: <p>
1033: <b>
1034: ".&mt("To create a new $extension, select a template from the".
1035: "pull-down menu below. Then click on the \"Create $extension\" button.")."</b>
1036: </p><form action=\"$url\" method=\"POST\">");
1037:
1038: if (defined($templatelist)) {
1039: $request->print("<select name=\"template\">$templatelist</select>");
1040: }
1041: $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"".&mt('Create')." $extension\" />");
1042: $request->print("</form></p>".&Apache::loncommon::end_page());
1043: }
1044: return '';
1045: }
1046:
1047: sub handler {
1048: #my $t0 = [&gettimeofday()];
1049: my $request=$_[0];
1050: $Apache::lonxml::request=$request;
1051: $Apache::lonxml::debug=$env{'user.debug'};
1052: $env{'request.uri'}=$request->uri;
1053: &setuppermissions();
1054: # some times multiple problemmodes are submitted, need to select
1055: # the last one
1056: if ( defined($env{'form.problemmode'}) && ref($env{'form.problemmode'}) ) {
1057: my $mode=$env{'form.problemmode'}->[-1];
1058: undef $env{'form.problemmode'};
1059: $env{'form.problemmode'}=$mode;
1060: }
1061:
1062: my $file=&Apache::lonnet::filelocation("",$request->uri);
1063:
1064: #check if we know where we are
1065: if ($env{'request.course.fn'} && !&Apache::lonnet::symbread()) {
1066: # if we are browsing we might not be able to know where we are
1067: if ($Apache::lonhomework::browse ne 'F' &&
1068: $env{'request.state'} ne "construct") {
1069: #should know where we are, so ask
1070: &unset_permissions();
1071: $request->internal_redirect('/adm/ambiguous');
1072: return OK;
1073: }
1074: }
1075: if (&setupheader($request)) {
1076: &unset_permissions();
1077: return OK;
1078: }
1079: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:$Apache::lonhomework::modifygrades:$Apache::lonhomework::queuegrade");
1080: &Apache::lonxml::debug("Problem Mode ".$env{'form.problemmode'});
1081: my ($symb) = &Apache::lonnet::whichuser();
1082: &Apache::lonxml::debug('symb is '.$symb);
1083: if ($env{'request.state'} eq "construct") {
1084: if ( -e $file ) {
1085: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1086: ['problemmode']);
1087: if (!(defined $env{'form.problemmode'})) {
1088: #first visit to problem in construction space
1089: $env{'form.problemmode'}='View';
1090: &renderpage($request,$file);
1091: } elsif ($env{'form.problemmode'} eq &mt('EditXML') ||
1092: $env{'form.problemmode'} eq 'EditXML') {
1093: &editxmlmode($request,$file);
1094: } elsif ($env{'form.problemmode'} eq &mt('Calculate answers')) {
1095: &analyze($request,$file);
1096: } else {
1097: &renderpage($request,$file);
1098: }
1099: } else {
1100: # requested file doesn't exist in contruction space
1101: &newproblem($request);
1102: }
1103: } else {
1104: # just render the page normally outside of construction space
1105: &Apache::lonxml::debug("not construct");
1106: &renderpage($request,$file);
1107: }
1108: #my $td=&tv_interval($t0);
1109: #&Apache::lonxml::debug("Spent $td seconds processing");
1110: # always turn off debug messages
1111: $Apache::lonxml::debug=0;
1112: &unset_permissions();
1113: return OK;
1114:
1115: }
1116:
1117: 1;
1118: __END__
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