1: # The LearningOnline Network with CAPA
2: # The LON-CAPA Homework handler
3: #
4: # $Id: lonhomework.pm,v 1.294 2008/07/01 11:01:30 foxr 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 Apache::loncommon();
53: use Apache::lonlocal;
54: use Time::HiRes qw( gettimeofday tv_interval );
55: use HTML::Entities();
56: use File::Copy();
57:
58: # FIXME - improve commenting
59:
60:
61: BEGIN {
62: &Apache::lonxml::register_insert();
63: }
64:
65:
66: =pod
67:
68: =item set_bubble_lines()
69:
70: Called at analysis time to set the bubble lines
71: hash for the problem.. This should be called in the
72: end_problemtype tag in analysis mode.
73:
74: We fetch the hash of part id counters from lonxml
75: and push them into analyze:{part_id.bubble_lines}.
76:
77: =cut
78:
79: sub set_bubble_lines {
80: my %bubble_counters = &Apache::lonxml::get_bubble_line_hash();
81:
82: foreach my $key (keys(%bubble_counters)) {
83: $Apache::lonhomework::analyze{"$key.bubble_lines"} =
84: $bubble_counters{"$key"};
85: }
86: }
87:
88: #
89: # Decides what targets to render for.
90: # Implicit inputs:
91: # Various session environment variables:
92: # request.state - published - is a /res/ resource
93: # uploaded - is a /uploaded/ resource
94: # contruct - is a /priv/ resource
95: # form.grade_target - a form parameter requesting a specific target
96: sub get_target {
97: &Apache::lonxml::debug("request.state = $env{'request.state'}");
98: if( defined($env{'form.grade_target'})) {
99: &Apache::lonxml::debug("form.grade_target= $env{'form.grade_target'}");
100: } else {
101: &Apache::lonxml::debug("form.grade_target <undefined>");
102: }
103: if (($env{'request.state'} eq "published") ||
104: ($env{'request.state'} eq "uploaded")) {
105: if ( defined($env{'form.grade_target'} )
106: && ($env{'form.grade_target'} eq 'tex')) {
107: return ($env{'form.grade_target'});
108: } elsif ( defined($env{'form.grade_target'} )
109: && ($Apache::lonhomework::viewgrades eq 'F' )) {
110: return ($env{'form.grade_target'});
111: } elsif ( $env{'form.grade_target'} eq 'webgrade'
112: && ($Apache::lonhomework::queuegrade eq 'F' )) {
113: return ($env{'form.grade_target'});
114: }
115: if ($env{'form.webgrade'} &&
116: ($Apache::lonhomework::modifygrades eq 'F'
117: || $Apache::lonhomework::queuegrade eq 'F' )) {
118: return ('grade','webgrade');
119: }
120: if ( defined($env{'form.submitted'}) &&
121: ( !defined($env{'form.newrandomization'}))) {
122: return ('grade', 'web');
123: } else {
124: return ('web');
125: }
126: } elsif ($env{'request.state'} eq "construct") {
127: if ( defined($env{'form.grade_target'}) ) {
128: return ($env{'form.grade_target'});
129: }
130: if ( defined($env{'form.preview'})) {
131: if ( defined($env{'form.submitted'})) {
132: return ('grade', 'web');
133: } else {
134: return ('web');
135: }
136: } else {
137: if ($env{'form.problemstate'} eq 'WEB_GRADE') {
138: #$env{'form.webgrade'} = 'yes';
139: return ('grade','webgrade','answer');
140: } elsif (($env{'form.problemmode'} eq 'view') ||
141: ($env{'form.problemmode'} eq 'discard')) {
142: if ( defined($env{'form.submitted'}) &&
143: (!defined($env{'form.resetdata'})) &&
144: (!defined($env{'form.newrandomization'}))) {
145: return ('grade', 'web','answer');
146: } else {
147: return ('web','answer');
148: }
149: } elsif ($env{'form.problemmode'} eq 'edit') {
150: if ( $env{'form.submitted'} eq 'edit' ) {
151: if ( $env{'form.submitbutton'} eq &mt('Save and View') ) {
152: return ('modified','web','answer');
153: } else {
154: return ('modified','no_output_web','edit');
155: }
156: } else {
157: return ('no_output_web','edit');
158: }
159: } else {
160: return ('web');
161: }
162: }
163: }
164: return ();
165: }
166:
167: sub setup_vars {
168: my ($target) = @_;
169: return ';'
170: # return ';$external::target='.$target.';';
171: }
172:
173: sub createmenu {
174: my ($which,$request)=@_;
175: if ($which eq 'grade') {
176: $request->print('<script language="JavaScript">
177: hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
178: "height=350,width=150,menubar=no");
179: </script>');
180: }
181: }
182:
183: sub proctor_checked_in {
184: my ($slot_name,$slot,$type)=@_;
185: my @possible_proctors=split(",",$slot->{'proctor'});
186:
187: return 1 if (!@possible_proctors);
188:
189: my $key;
190: if ($type eq 'Task') {
191: my $version=$Apache::lonhomework::history{'resource.0.version'};
192: $key ="resource.$version.0.checkedin";
193: } elsif ($type eq 'problem') {
194: $key ='resource.0.checkedin';
195: }
196: # backward compatability, used to be username@domain,
197: # now is username:domain
198: my $who = $Apache::lonhomework::history{$key};
199: if ($who !~ /:/) {
200: $who =~ tr/@/:/;
201: }
202: foreach my $possible (@possible_proctors) {
203: if ($who eq $possible
204: && $Apache::lonhomework::history{$key.'.slot'} eq $slot_name) {
205: return 1;
206: }
207: }
208:
209: return 0;
210: }
211:
212: sub check_ip_acc {
213: my ($acc)=@_;
214: &Apache::lonxml::debug("acc is $acc");
215: if (!defined($acc) || $acc =~ /^\s*$/ || $acc =~/^\s*no\s*$/i) {
216: return 1;
217: }
218: my $allowed=0;
219: my $ip=$env{'request.host'} || $ENV{'REMOTE_ADDR'};
220:
221: my $name;
222: foreach my $pattern (split(',',$acc)) {
223: $pattern =~ s/^\s*//;
224: $pattern =~ s/\s*$//;
225: if ($pattern =~ /\*$/) {
226: #35.8.*
227: $pattern=~s/\*//;
228: if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
229: } elsif ($pattern =~ /(\d+\.\d+\.\d+)\.\[(\d+)-(\d+)\]$/) {
230: #35.8.3.[34-56]
231: my $low=$2;
232: my $high=$3;
233: $pattern=$1;
234: if ($ip =~ /^\Q$pattern\E/) {
235: my $last=(split(/\./,$ip))[3];
236: if ($last <=$high && $last >=$low) { $allowed=1; }
237: }
238: } elsif ($pattern =~ /^\*/) {
239: #*.msu.edu
240: $pattern=~s/\*//;
241: if (!defined($name)) {
242: use Socket;
243: my $netaddr=inet_aton($ip);
244: ($name)=gethostbyaddr($netaddr,AF_INET);
245: }
246: if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
247: } elsif ($pattern =~ /\d+\.\d+\.\d+\.\d+/) {
248: #127.0.0.1
249: if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
250: } else {
251: #some.name.com
252: if (!defined($name)) {
253: use Socket;
254: my $netaddr=inet_aton($ip);
255: ($name)=gethostbyaddr($netaddr,AF_INET);
256: }
257: if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
258: }
259: if ($allowed) { last; }
260: }
261: return $allowed;
262: }
263:
264: sub check_slot_access {
265: my ($id,$type)=@_;
266:
267: # does it pass normal muster
268: my ($status,$datemsg)=&check_access($id);
269:
270: my $useslots = &Apache::lonnet::EXT("resource.0.useslots");
271: if ($useslots ne 'resource' && $useslots ne 'map'
272: && $useslots ne 'map_map') {
273: return ($status,$datemsg);
274: }
275:
276: if ($status eq 'SHOW_ANSWER' ||
277: $status eq 'CLOSED' ||
278: $status eq 'INVALID_ACCESS' ||
279: $status eq 'UNAVAILABLE') {
280: return ($status,$datemsg);
281: }
282: if ($env{'request.state'} eq "construct") {
283: return ($status,$datemsg);
284: }
285:
286: if ($type eq 'Task') {
287: my $version=$Apache::lonhomework::history{'resource.version'};
288: if ($Apache::lonhomework::history{"resource.$version.0.checkedin"} &&
289: $Apache::lonhomework::history{"resource.$version.0.status"} eq 'pass') {
290: return ('SHOW_ANSWER');
291: }
292: }
293:
294: my $availablestudent = &Apache::lonnet::EXT("resource.0.availablestudent");
295: my $available = &Apache::lonnet::EXT("resource.0.available");
296: my @slots= (split(':',$availablestudent),split(':',$available));
297:
298: # if (!@slots) {
299: # return ($status,$datemsg);
300: # }
301: my $slotstatus='NOT_IN_A_SLOT';
302: my ($returned_slot,$slot_name);
303: foreach my $slot (@slots) {
304: $slot =~ s/(^\s*|\s*$)//g;
305: &Apache::lonxml::debug("getting $slot");
306: my %slot=&Apache::lonnet::get_slot($slot);
307: &Apache::lonhomework::showhash(%slot);
308: if ($slot{'starttime'} < time &&
309: $slot{'endtime'} > time &&
310: &check_ip_acc($slot{'ip'})) {
311: &Apache::lonxml::debug("$slot is good");
312: $slotstatus='NEEDS_CHECKIN';
313: $returned_slot=\%slot;
314: $slot_name=$slot;
315: last;
316: }
317: }
318: if ($slotstatus eq 'NEEDS_CHECKIN' &&
319: &proctor_checked_in($slot_name,$returned_slot,$type)) {
320: &Apache::lonxml::debug("protoctor checked in");
321: $slotstatus='CAN_ANSWER';
322: }
323:
324: my ($is_correct,$got_grade,$checkedin);
325: if ($type eq 'Task') {
326: my $version=$Apache::lonhomework::history{'resource.0.version'};
327: $got_grade =
328: ($Apache::lonhomework::history{"resource.$version.0.status"}
329: =~ /^(?:pass|fail)$/);
330: $is_correct =
331: ($Apache::lonhomework::history{"resource.$version.0.status"} eq 'pass'
332: || $Apache::lonhomework::history{"resource.0.solved"} =~ /^correct_/ );
333: $checkedin =
334: $Apache::lonhomework::history{"resource.$version.0.checkedin"};
335: } elsif ($type eq 'problem') {
336: $got_grade = 1;
337: $checkedin = $Apache::lonhomework::history{"resource.0.checkedin"};
338: $is_correct =
339: ($Apache::lonhomework::history{"resource.0.solved"} =~/^correct_/);
340: }
341:
342: &Apache::lonxml::debug(" slot is $slotstatus checkedin ($checkedin) got_grade ($got_grade) is_correct ($is_correct)");
343:
344: # no slot is currently open, and has been checked in for this version
345: # but hasn't got a grade, therefore must be awaiting a grade
346: if (!defined($slot_name)
347: && $checkedin
348: && !$got_grade) {
349: return ('WAITING_FOR_GRADE');
350: }
351:
352: # no slot is currently open, and has been checked in for this version
353: # previous slot is therefore CLOSED, so therefore the problem is
354: if (!defined($slot_name)
355: && $checkedin
356: && $type eq 'problem') {
357: return ('CLOSED',$datemsg);
358: }
359:
360: if ($slotstatus eq 'NOT_IN_A_SLOT'
361: && $checkedin ) {
362:
363: if ($got_grade) {
364: return ('SHOW_ANSWER');
365: } else {
366: return ('WAITING_FOR_GRADE');
367: }
368:
369: }
370:
371: if ( $is_correct) {
372: if ($type eq 'problem') {
373: return ($status);
374: }
375: return ('SHOW_ANSWER');
376: }
377:
378: if ( $status eq 'CANNOT_ANSWER' &&
379: ($slotstatus ne 'NEEDS_CHECKIN' && $slotstatus ne 'NOT_IN_A_SLOT')) {
380: return ($status,$datemsg);
381: }
382:
383: return ($slotstatus,$datemsg,$slot_name,$returned_slot);
384: }
385:
386: # JB, 9/24/2002: Any changes in this function may require a change
387: # in lonnavmaps::resource::getDateStatus.
388: sub check_access {
389: my ($id) = @_;
390: my $date ='';
391: my $status;
392: my $datemsg = '';
393: my $lastdate = '';
394: my $type;
395: my $passed;
396:
397: if ($env{'request.state'} eq "construct") {
398: if ($env{'form.problemstate'}) {
399: if ($env{'form.problemstate'} =~ /^CANNOT_ANSWER/) {
400: if ( ! ($env{'form.problemstate'} eq 'CANNOT_ANSWER_correct'
401: && &hide_problem_status())) {
402: return ('CANNOT_ANSWER',
403: &mt('is in this state due to author settings.'));
404: }
405: } else {
406: return ($env{'form.problemstate'},
407: &mt('is in this state due to author settings.'));
408: }
409: }
410: &Apache::lonxml::debug("in construction ignoring dates");
411: $status='CAN_ANSWER';
412: $datemsg=&mt('is in under construction');
413: # return ($status,$datemsg);
414: }
415:
416: &Apache::lonxml::debug("checking for part :$id:");
417: &Apache::lonxml::debug("time:".time);
418:
419: my ($symb)=&Apache::lonnet::whichuser();
420: &Apache::lonxml::debug("symb:".$symb);
421: #if ($env{'request.state'} ne "construct" && $symb ne '') {
422: if ($env{'request.state'} ne "construct") {
423: my $idacc = &Apache::lonnet::EXT("resource.$id.acc");
424: my $allowed=&check_ip_acc($idacc);
425: if (!$allowed && ($Apache::lonhomework::browse ne 'F')) {
426: $status='INVALID_ACCESS';
427: $date=&mt("can not be accessed from your location.");
428: return($status,$date);
429: }
430:
431: foreach my $temp ("opendate","duedate","answerdate") {
432: $lastdate = $date;
433: if ($temp eq 'duedate') {
434: $date = &due_date($id);
435: } else {
436: $date = &Apache::lonnet::EXT("resource.$id.$temp");
437: }
438:
439: my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
440: if ($thistype =~ /^(con_lost|no_such_host)/ ||
441: $date =~ /^(con_lost|no_such_host)/) {
442: $status='UNAVAILABLE';
443: $date=&mt("may open later.");
444: return($status,$date);
445: }
446: if ($thistype eq 'date_interval') {
447: if ($temp eq 'opendate') {
448: $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
449: }
450: if ($temp eq 'answerdate') {
451: $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
452: }
453: }
454: &Apache::lonxml::debug("found :$date: for :$temp:");
455: if ($date eq '') {
456: $date = &mt("an unknown date"); $passed = 0;
457: } elsif ($date eq 'con_lost') {
458: $date = &mt("an indeterminate date"); $passed = 0;
459: } else {
460: if (time < $date) { $passed = 0; } else { $passed = 1; }
461: $date = &Apache::lonlocal::locallocaltime($date);
462: }
463: if (!$passed) { $type=$temp; last; }
464: }
465: &Apache::lonxml::debug("have :$type:$passed:");
466: if ($passed) {
467: $status='SHOW_ANSWER';
468: $datemsg=$date;
469: } elsif ($type eq 'opendate') {
470: $status='CLOSED';
471: $datemsg = &mt("will open on")." $date";
472: } elsif ($type eq 'duedate') {
473: $status='CAN_ANSWER';
474: $datemsg = &mt("is due at")." $date";
475: } elsif ($type eq 'answerdate') {
476: $status='CLOSED';
477: $datemsg = &mt("was due on")." $lastdate".&mt(", and answers will be available on")." $date";
478: }
479: }
480: if ($status eq 'CAN_ANSWER' ||
481: (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED'))) {
482: #check #tries, and if correct.
483: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
484: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
485: if ( $tries eq '' ) { $tries = '0'; }
486: if ( $maxtries eq '' &&
487: $env{'request.state'} ne 'construct') { $maxtries = '2'; }
488: if ($maxtries && $tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
489: # if (correct and show prob status) or excused then CANNOT_ANSWER
490: if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
491: &&
492: &show_problem_status())
493: ||
494: $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
495: $status = 'CANNOT_ANSWER';
496: }
497: if ($status eq 'CANNOT_ANSWER'
498: && &show_answer_problem_status()) {
499: $status = 'SHOW_ANSWER';
500: }
501: }
502: if ($status eq 'CAN_ANSWER' || $status eq 'CANNOT_ANSWER') {
503: my @interval=&Apache::lonnet::EXT("resource.$id.interval");
504: &Apache::lonxml::debug("looking for interval @interval");
505: if ($interval[0]) {
506: my $first_access=&Apache::lonnet::get_first_access($interval[1]);
507: &Apache::lonxml::debug("looking for accesstime $first_access");
508: if (!$first_access) {
509: $status='NOT_YET_VIEWED';
510: my $due_date = &due_date($id);
511: my $seconds_left = $due_date - time;
512: if ($seconds_left > $interval[0] || $due_date eq '') {
513: $seconds_left = $interval[0];
514: }
515: $datemsg=&seconds_to_human_length($seconds_left);
516: }
517: }
518: }
519:
520: #if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
521: # (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
522: # return ('UNCHECKEDOUT','needs to be checked out');
523: #}
524:
525:
526: &Apache::lonxml::debug("sending back :$status:$datemsg:");
527: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
528: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
529: $status='CAN_ANSWER';
530: $datemsg=&mt('is closed but you are allowed to view it');
531: }
532:
533: return ($status,$datemsg);
534: }
535: # this should work exactly like the copy in lonnavmaps.pm
536: sub due_date {
537: my ($part_id,$symb,$udom,$uname)=@_;
538: my $date;
539: my @interval= &Apache::lonnet::EXT("resource.$part_id.interval",$symb,
540: $udom,$uname);
541: &Apache::lonxml::debug("looking for interval $part_id $symb @interval");
542: my $due_date= &Apache::lonnet::EXT("resource.$part_id.duedate",$symb,
543: $udom,$uname);
544: &Apache::lonxml::debug("looking for due_date $part_id $symb $due_date");
545: if ($interval[0] =~ /\d+/) {
546: my $first_access=&Apache::lonnet::get_first_access($interval[1],$symb);
547: &Apache::lonxml::debug("looking for first_access $first_access ($interval[1])");
548: if (defined($first_access)) {
549: my $interval = $first_access+$interval[0];
550: $date = (!$due_date || $interval < $due_date) ? $interval
551: : $due_date;
552: } else {
553: $date = $due_date;
554: }
555: } else {
556: $date = $due_date;
557: }
558: return $date
559: }
560:
561: sub seconds_to_human_length {
562: my ($length)=@_;
563:
564: my $seconds=$length%60; $length=int($length/60);
565: my $minutes=$length%60; $length=int($length/60);
566: my $hours=$length%24; $length=int($length/24);
567: my $days=$length;
568:
569: my $timestr;
570: if ($days > 0) { $timestr.=&mt('[quant,_1,day]',$days); }
571: if ($hours > 0) { $timestr.=($timestr?", ":"").
572: &mt('[quant,_1,hour]',$hours); }
573: if ($minutes > 0) { $timestr.=($timestr?", ":"").
574: &mt('[quant,_1,minute]',$minutes); }
575: if ($seconds > 0) { $timestr.=($timestr?", ":"").
576: &mt('[quant,_1,second]',$seconds); }
577: return $timestr;
578: }
579:
580: sub showhash {
581: my (%hash) = @_;
582: &showhashsubset(\%hash,'.');
583: return '';
584: }
585:
586: sub showarray {
587: my ($array)=@_;
588: my $string="(";
589: foreach my $elm (@{ $array }) {
590: if (ref($elm) eq 'ARRAY') {
591: $string.=&showarray($elm);
592: } elsif (ref($elm) eq 'HASH') {
593: $string.= "HASH --- \n<br />";
594: $string.= &showhashsubset($elm,'.');
595: } else {
596: $string.="$elm,"
597: }
598: }
599: chop($string);
600: $string.=")";
601: return $string;
602: }
603:
604: sub showhashsubset {
605: my ($hash,$keyre) = @_;
606: my $resultkey;
607: foreach $resultkey (sort keys %$hash) {
608: if ($resultkey !~ /$keyre/) { next; }
609: if (ref($$hash{$resultkey}) eq 'ARRAY' ) {
610: &Apache::lonxml::debug("$resultkey ---- ".
611: &showarray($$hash{$resultkey}));
612: } elsif (ref($$hash{$resultkey}) eq 'HASH' ) {
613: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
614: &showhashsubset($$hash{$resultkey},'.');
615: } else {
616: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
617: }
618: }
619: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
620: return '';
621: }
622:
623: sub setuppermissions {
624: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$env{'request.filename'});
625: my $viewgrades = &Apache::lonnet::allowed('vgr',$env{'request.course.id'});
626: if (! $viewgrades &&
627: exists($env{'request.course.sec'}) &&
628: $env{'request.course.sec'} !~ /^\s*$/) {
629: $viewgrades = &Apache::lonnet::allowed('vgr',$env{'request.course.id'}.
630: '/'.$env{'request.course.sec'});
631: }
632: $Apache::lonhomework::viewgrades = $viewgrades;
633:
634: if ($Apache::lonhomework::browse eq 'F' &&
635: $env{'form.devalidatecourseresdata'} eq 'on') {
636: my (undef,$courseid) = &Apache::lonnet::whichuser();
637: &Apache::lonnet::devalidatecourseresdata($env{"course.$courseid.num"},
638: $env{"course.$courseid.domain"});
639: }
640:
641: my $modifygrades = &Apache::lonnet::allowed('mgr',$env{'request.course.id'});
642: if (! $modifygrades &&
643: exists($env{'request.course.sec'}) &&
644: $env{'request.course.sec'} !~ /^\s*$/) {
645: $modifygrades =
646: &Apache::lonnet::allowed('mgr',$env{'request.course.id'}.
647: '/'.$env{'request.course.sec'});
648: }
649: $Apache::lonhomework::modifygrades = $modifygrades;
650:
651: my $queuegrade = &Apache::lonnet::allowed('mqg',$env{'request.course.id'});
652: if (! $queuegrade &&
653: exists($env{'request.course.sec'}) &&
654: $env{'request.course.sec'} !~ /^\s*$/) {
655: $queuegrade =
656: &Apache::lonnet::allowed('qgr',$env{'request.course.id'}.
657: '/'.$env{'request.course.sec'});
658: }
659: $Apache::lonhomework::queuegrade = $queuegrade;
660: return '';
661: }
662:
663: sub unset_permissions {
664: undef($Apache::lonhomework::queuegrade);
665: undef($Apache::lonhomework::modifygrades);
666: undef($Apache::lonhomework::viewgrades);
667: undef($Apache::lonhomework::browse);
668: }
669:
670: sub setupheader {
671: my $request=$_[0];
672: &Apache::loncommon::content_type($request,'text/html');
673: if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
674: &Apache::loncommon::no_cache($request);
675: }
676: # $request->set_last_modified(&Apache::lonnet::metadata($request->uri,
677: # 'lastrevisiondate'));
678: $request->send_http_header;
679: return OK if $request->header_only;
680: return ''
681: }
682:
683: sub handle_save_or_undo {
684: my ($request,$problem,$result) = @_;
685: my $file = &Apache::lonnet::filelocation("",$request->uri);
686: my $filebak =$file.".bak";
687: my $filetmp =$file.".tmp";
688: my $error=0;
689: if ($env{'form.Undo'} eq &mt('undo')) {
690: my $error=0;
691: if (!&File::Copy::copy($file,$filetmp)) { $error=1; }
692: if ((!$error) && (!&File::Copy::copy($filebak,$file))) { $error=1; }
693: if ((!$error) && (!&File::Copy::move($filetmp,$filebak))) { $error=1; }
694: if (!$error) {
695: &Apache::lonxml::info("<p><b>".
696: &mt("Undid changes, Switched [_1] and [_2]",
697: '<span class="LC_filename">'.$filebak.
698: '</span>',
699: '<span class="LC_filename">'.$file.
700: '</span>')."</b></p>");
701: } else {
702: &Apache::lonxml::info("<p><span class=\"LC_error\">".
703: &mt("Unable to undo, unable to switch [_1] and [_2]",
704: '<span class="LC_filename">'.
705: $filebak.'</span>',
706: '<span class="LC_filename">'.
707: $file.'</span>')."</span></p>");
708: $error=1;
709: }
710: } else {
711: &Apache::lonnet::correct_line_ends($result);
712: my $fs=Apache::File->new(">$filebak");
713: if (defined($fs)) {
714: print $fs $$problem;
715: } else {
716: &Apache::lonxml::info("<span class=\"LC_error\">".
717: &mt("Unable to make backup [_1]",
718: '<span class="LC_filename">'.
719: $filebak.'</span>')."</span>");
720: $error=2;
721: }
722: my $fh=Apache::File->new(">$file");
723: if (defined($fh)) {
724: print $fh $$result;
725: } else {
726: &Apache::lonxml::info('<span class="LC_error">'.
727: &mt("Unable to write to [_1]",
728: '<span class="LC_filename">'.
729: $file.'</span>').
730: '</span>');
731: $error|=4;
732: }
733: }
734: return $error;
735: }
736:
737: sub analyze_header {
738: my ($request) = @_;
739: my $js = &Apache::structuretags::setmode_javascript();
740: my $result =
741: &Apache::loncommon::start_page('Analyzing a problem',$js);
742:
743: $result .=
744: &Apache::lonxml::message_location().'
745: <form name="lonhomework" method="POST" action="'.
746: &HTML::Entities::encode($env{'request.uri'},'<>&"').'">'.
747: '<input type="hidden" name="problemmode" value="'.
748: $env{'form.problemmode'}.'" />'.
749: &Apache::structuretags::remember_problem_state().'
750: <div class="LC_edit_problem_analyze_header">
751: <input type="button" name="submitmode" value="'.&mt("EditXML").'" '.
752: 'onclick="javascript:setmode(this.form,'."'editxml'".')" />
753: <input type="button" name="submitmode" value="'.&mt('Edit').'" '.
754: 'onclick="javascript:setmode(this.form,'."'edit'".')" />
755: <hr class="LC_edit_problem_divide" />
756: <input type="button" name="submitmode" value="'.&mt("View").'" '.
757: 'onclick="javascript:setmode(this.form,'."'view'".')" />
758: <hr class="LC_edit_problem_divide" />
759: </div>
760: </form>';
761: &Apache::lonxml::add_messages(\$result);
762: $request->print($result);
763: $request->rflush();
764: }
765:
766: sub analyze_footer {
767: my ($request) = @_;
768: $request->print(&Apache::loncommon::end_page());
769: $request->rflush();
770: }
771:
772: sub analyze {
773: my ($request,$file) = @_;
774: &Apache::lonxml::debug("Analyze");
775: my $result;
776: my %overall;
777: my %seedexample;
778: my %allparts;
779: my $rndseed=$env{'form.rndseed'};
780: &analyze_header($request);
781: my %prog_state=
782: &Apache::lonhtmlcommon::Create_PrgWin($request,&mt('Analyze Progress'),
783: &mt('Getting Problem Variants'),
784: $env{'form.numtoanalyze'},
785: 'inline',undef);
786: for(my $i=1;$i<$env{'form.numtoanalyze'}+1;$i++) {
787: &Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
788: &mt('last problem'));
789: if (&Apache::loncommon::connection_aborted($request)) { return; }
790: my $thisseed=$i+$rndseed;
791: my $subresult=&Apache::lonnet::ssi($request->uri,
792: ('grade_target' => 'analyze'),
793: ('rndseed' => $thisseed));
794: (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
795: my %analyze=&Apache::lonnet::str2hash($subresult);
796: my @parts;
797: if (defined(@{ $analyze{'parts'} })) {
798: @parts=@{ $analyze{'parts'} };
799: }
800: foreach my $part (@parts) {
801: if (!exists($allparts{$part})) {$allparts{$part}=1;};
802: if ($analyze{$part.'.type'} eq 'numericalresponse' ||
803: $analyze{$part.'.type'} eq 'stringresponse' ||
804: $analyze{$part.'.type'} eq 'formularesponse' ) {
805: foreach my $name (keys(%{ $analyze{$part.'.answer'} })) {
806: my $i=0;
807: foreach my $answer_part (@{ $analyze{$part.'.answer'}{$name} }) {
808: push( @{ $overall{$part.'.answer'}[$i] },
809: $answer_part);
810: my $concatanswer= join("\0",@{ $answer_part });
811: if (($concatanswer eq '') || ($concatanswer=~/^\@/)) {
812: $answer_part = ['<span class="LC_error">'.&mt('Error').'</span>'];
813: }
814: $seedexample{join("\0",$part,$i,@{$answer_part})}=
815: $thisseed;
816: $i++;
817: }
818: }
819: if (!keys(%{ $analyze{$part.'.answer'} })) {
820: my $answer_part =
821: ['<span class="LC_error">'.&mt('Error').'</span>'];
822: $seedexample{join("\0",$part,0,@{$answer_part})}=
823: $thisseed;
824: push( @{ $overall{$part.'.answer'}[0] },
825: $answer_part);
826: }
827: }
828: }
829: }
830: &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
831: &mt('Analyzing Results'));
832: $request->print('<hr class="LC_edit_problem_divide" />'.&mt('List of possible answers').': ');
833: foreach my $part (sort(keys(%allparts))) {
834: if (defined(@{ $overall{$part.'.answer'} })) {
835: for (my $i=0;$i<scalar(@{ $overall{$part.'.answer'} });$i++) {
836: my $num_cols=scalar(@{ $overall{$part.'.answer'}[$i][0] });
837: $request->print('<table class="thinborder"><tr><th colspan="'.($num_cols+1).'">'.&mt('Part').' '.$part);
838: if (scalar(@{ $overall{$part.'.answer'} }) > 1) {
839: $request->print(&mt(' Answer [_1]',$i+1));
840: }
841: $request->print('</th></tr>');
842: my %frequency;
843: foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'}[$i] })) {
844: $frequency{join("\0",@{ $answer })}++;
845: }
846: $request->print('<tr><th colspan="'.($num_cols).'">'.&mt('Answer').'</th><th>'.&mt('Frequency').'<br />('
847: .&mt('click for example').')</th></tr>');
848: foreach my $answer (sort {(split("\0",$a))[0] <=> (split("\0",$b))[0]} (keys(%frequency))) {
849: $request->print('<tr><td class="center">'.
850: join('</td><td class="center">',split("\0",$answer)).
851: '</td><td class="center"><a href="'.$request->uri.'?rndseed='.$seedexample{join("\0",$part,$i,$answer)}.'">'.$frequency{$answer}.
852: '</a></td></tr>');
853: }
854: $request->print('</table>');
855: }
856: } else {
857: $request->print('<p>'.&mt('Response').' '.$part.' '.
858: &mt('is not analyzable at this time').'</p>');
859: }
860: }
861: if (scalar(keys(%allparts)) == 0 ) {
862: $request->print('<p>'.&mt('Found no analyzable responses in this problem, currently only Numerical, Formula and String response styles are supported.').'</p>');
863: }
864: &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
865: &analyze_footer($request);
866: &Apache::lonhomework::showhash(%overall);
867: return $result;
868: }
869:
870: {
871: my $show_problem_status;
872: sub reset_show_problem_status {
873: undef($show_problem_status);
874: }
875:
876: sub set_show_problem_status {
877: my ($new_status) = @_;
878: $show_problem_status = lc($new_status);
879: }
880:
881: sub hide_problem_status {
882: return ($show_problem_status eq 'no'
883: || $show_problem_status eq 'no_feedback_ever');
884: }
885:
886: sub show_problem_status {
887: return ($show_problem_status eq 'yes'
888: || $show_problem_status eq 'answer'
889: || $show_problem_status eq '');
890: }
891:
892: sub show_some_problem_status {
893: return ($show_problem_status eq 'no');
894: }
895:
896: sub show_no_problem_status {
897: return ($show_problem_status eq 'no_feedback_ever');
898: }
899:
900: sub show_answer_problem_status {
901: return ($show_problem_status eq 'answer');
902: }
903: }
904:
905: sub editxmlmode {
906: my ($request,$file) = @_;
907: my $result;
908: my $problem=&Apache::lonnet::getfile($file);
909: if ($problem eq -1) {
910: &Apache::lonxml::error("<b> ".&mt('Unable to find').
911: " <i>$file</i></b>");
912: $problem='';
913: }
914: if (defined($env{'form.editxmltext'}) || defined($env{'form.Undo'})) {
915: my $error=&handle_save_or_undo($request,\$problem,
916: \$env{'form.editxmltext'});
917: if (!$error) { $problem=&Apache::lonnet::getfile($file); }
918: }
919: &Apache::lonhomework::showhashsubset(\%env,'^form');
920: if ( $env{'form.submitbutton'} eq &mt('Save and View') ) {
921: &Apache::lonhomework::showhashsubset(\%env,'^form');
922: $env{'form.problemmode'}='view';
923: &renderpage($request,$file);
924: } else {
925: my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
926: my $xml_help = '<table><tr><td>'.
927: &Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
928: "Problem Editing Help").
929: '</td><td>'.
930: &Apache::loncommon::help_open_menu(undef,undef,5,'Authoring').
931: '</td></tr></table>';
932: if ($cols > 80) { $cols = 80; }
933: if ($cols < 70) { $cols = 70; }
934: if ($rows < 20) { $rows = 20; }
935: my $js =
936: &Apache::edit::js_change_detection().
937: &Apache::loncommon::resize_textarea_js().
938: &Apache::structuretags::setmode_javascript();
939: my $only_body = ($env{'environment.remote'} eq 'off')? 0 : 1;
940: my $dragmath = <<ENDDRAGMATH;
941: <script language="JavaScript">
942: function mathedit(textarea, doc) {
943: targetEntry = textarea;
944: targetDoc = doc;
945: newwin = window.open("/adm/dragmath/applet/EditMathPopup.html","","width=565,height=500,resizable");
946: }
947: </script>
948: <input type="button" value="Edit Math", onclick="javascript:mathedit('LC_editxmltext',document)" />
949: ENDDRAGMATH
950: my $start_page =
951: &Apache::loncommon::start_page(&mt("EditXML [_1]",$file),$js,
952: {'no_auto_mt_title' => 1,
953: 'only_body' => $only_body,
954: 'add_entries' => {
955: 'onresize' => q[resize_textarea('LC_editxmltext','LC_aftertextarea')],
956: 'onload' => q[resize_textarea('LC_editxmltext','LC_aftertextarea')],
957: }});
958: $result.=$start_page.
959: &renderpage($request,$file,['no_output_web'],1).
960: '<form '.&Apache::edit::form_change_detection().' name="lonhomework" method="POST" action="'.
961: &HTML::Entities::encode($env{'request.uri'},'<>&"').'">'.
962: &Apache::structuretags::remember_problem_state().'
963: <div class="LC_edit_problem_editxml_header">
964: <table class="LC_edit_problem_header_title"><tr><td>
965: '.&mt('Problem Editing').&Apache::loncommon::help_open_topic('Problem_Editor_XML_Index').'
966: </td><td align="right">
967: '.&Apache::loncommon::helpLatexCheatsheet().'
968: </td></tr>
969: </table>
970: <div class="LC_edit_problem_discards">
971: <input type="hidden" name="problemmode" value="editxml" />
972:
973: <input type="button" name="submitmode" accesskey="d" value="'.&mt('Discard Edits and View').'" '.
974: 'onclick="javascript:setmode(this.form,'."'discard'".')" />
975: <input type="button" '.&Apache::edit::submit_ask_anyway('setmode(this.form,'."'edit'".')').'name="submitmode" accesskey="e" value="'.&mt('Edit').'" />
976: <input type="submit" name="Undo" accesskey="u" value="'.&mt('undo').'" />
977: </div>
978: <div class="LC_edit_problem_saves">
979: <input type="submit" name="submitbutton" accesskey="s" value="'.&mt('Save').'" />
980: <input type="submit" name="submitbutton" accesskey="v" value="'.&mt('Save and View').'" />'
981: .$dragmath.'
982: </div>
983: <hr class="LC_edit_problem_divide" />
984: '.&Apache::lonxml::message_location().'
985: </div>
986: ' . '
987: <textarea '.&Apache::edit::element_change_detection().
988: ' rows="'.$rows.'" cols="'.$cols.'" style="width:100%" '.
989: ' name="editxmltext" id="LC_editxmltext">'.
990: &HTML::Entities::encode($problem,'<>&"').'</textarea>
991: <div id="LC_aftertextarea">
992: </div>
993: </form>'.&Apache::loncommon::end_page();
994: &Apache::lonxml::add_messages(\$result);
995: $request->print($result);
996: }
997: return '';
998: }
999:
1000: #
1001: # Render the page in whatever target desired.
1002: #
1003: sub renderpage {
1004: my ($request,$file,$targets,$return_string) = @_;
1005:
1006: my @targets = @{$targets || [&get_target()]};
1007: &Apache::lonhomework::showhashsubset(\%env,'form.');
1008: &Apache::lonxml::debug("Running targets ".join(':',@targets));
1009:
1010: my $overall_result;
1011: foreach my $target (@targets) {
1012: # FIXME need to do something intelligent when a problem goes
1013: # from viewable to not viewable due to map conditions
1014: #&setuppermissions();
1015: #if ( $Apache::lonhomework::browse ne '2'
1016: # && $Apache::lonhomework::browse ne 'F' ) {
1017: # $request->print(" You most likely shouldn't see me.");
1018: #}
1019: #my $t0 = [&gettimeofday()];
1020: my $output=1;
1021: if ($target eq 'no_output_web') {
1022: $target = 'web'; $output=0;
1023: }
1024: my $problem=&Apache::lonnet::getfile($file);
1025: my $result;
1026: if ($problem eq -1) {
1027: $problem='';
1028: my $filename=(split('/',$file))[-1];
1029: my $error =
1030: "<b> ".&mt('Unable to find [_1]',
1031: ' <span class="LC_filename">'.$filename.'</span>')
1032: ."</b>";
1033: $result.=
1034: &Apache::loncommon::simple_error_page($request,'Not available',
1035: $error);
1036: return;
1037: }
1038:
1039: my %mystyle;
1040: if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
1041: if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
1042: if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%env,'^form');}
1043:
1044: &Apache::lonxml::debug("Should be parsing now");
1045: $result .= &Apache::lonxml::xmlparse($request, $target, $problem,
1046: &setup_vars($target),%mystyle);
1047: &finished_parsing();
1048: if (!$output) { $result = ''; }
1049: #$request->print("Result follows:");
1050: if ($target eq 'modified') {
1051: &handle_save_or_undo($request,\$problem,\$result);
1052: } else {
1053: if ($target eq 'analyze') {
1054: $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
1055: undef(%Apache::lonhomework::analyze);
1056: }
1057: #my $td=&tv_interval($t0);
1058: #if ( $Apache::lonxml::debug) {
1059: #$result =~ s:</body>::;
1060: #$result.="<br />Spent $td seconds processing target $target\n</body>";
1061: #}
1062: # $request->print($result);
1063: $overall_result.=$result;
1064: # $request->rflush();
1065: }
1066: #$request->print(":Result ends");
1067: #my $td=&tv_interval($t0);
1068: }
1069: if (!$return_string) {
1070: &Apache::lonxml::add_messages(\$overall_result);
1071: $request->print($overall_result);
1072: $request->rflush();
1073: } else {
1074: return $overall_result;
1075: }
1076: }
1077:
1078: sub finished_parsing {
1079: undef($Apache::lonhomework::parsing_a_problem);
1080: undef($Apache::lonhomework::parsing_a_task);
1081: }
1082:
1083: sub get_template_list {
1084: my ($extension) = @_;
1085: my $result;
1086: my @allnames;
1087: &Apache::lonxml::debug("Looking for :$extension:");
1088: my $glob_extension = $extension;
1089: if ($extension eq 'survey' || $extension eq 'exam') {
1090: $glob_extension = 'problem';
1091: }
1092: my @files = glob($Apache::lonnet::perlvar{'lonIncludes'}.
1093: '/templates/*.'.$glob_extension);
1094: @files = map {[$_,&mt(&Apache::lonnet::metadata($_, 'title')),
1095: (&Apache::lonnet::metadata($_, 'category')?&mt(&Apache::lonnet::metadata($_, 'category')):&mt('Miscellaneous')),
1096: &mt(&Apache::lonnet::metadata($_, 'help'))]} (@files);
1097: @files = sort {$a->[2].$a->[1] cmp $b->[2].$b->[1]} (@files);
1098: my ($midpoint,$seconddiv,$numfiles);
1099: $numfiles = 0;
1100: foreach my $file (@files) {
1101: next if ($file->[1] !~ /\S/);
1102: $numfiles ++;
1103: }
1104: if ($numfiles > 0) {
1105: $result = '<div class="LC_left_float">';
1106: $midpoint = int($numfiles/2);
1107: if ($numfiles%2) {
1108: $midpoint ++;
1109: }
1110: }
1111: my $count = 0;
1112: my $currentcategory='';
1113: foreach my $file (@files) {
1114: next if ($file->[1] !~ /\S/);
1115: if ($file->[2] ne $currentcategory) {
1116: $currentcategory=$file->[2];
1117: if ((!$seconddiv) && ($count >= $midpoint)) {
1118: $result .= '</div>'."\n".'<div class="LC_left_float">'."\n";
1119: $seconddiv = 1;
1120: }
1121: $result.='<h3>'.$currentcategory.'</h3>';
1122: $count++;
1123: }
1124: $result .=
1125: '<label><input type="radio" name="template" value="'.$file->[0].'" />'.
1126: $file->[1].'</label>';
1127: if ($file->[3]) {
1128: $result.=&Apache::loncommon::help_open_topic($file->[3]);
1129: }
1130: my $filename=$file->[0];
1131: $filename=~s/^\/home\/httpd\/html//;
1132: $result.=' <font size="-2"><a href="'.$filename.'" target="sample">'.&mt('Example').'</font></a><br />'."\n";
1133: $count ++;
1134: }
1135: if ($numfiles > 0) {
1136: $result .= '</div>'."\n".'<div class="LC_clear_float_footer"></div>'."\n";
1137: }
1138: return $result;
1139: }
1140:
1141: sub newproblem {
1142: my ($request) = @_;
1143:
1144: if ($env{'form.template'}) {
1145: my $file = $env{'form.template'};
1146: my $dest = &Apache::lonnet::filelocation("",$request->uri);
1147: &File::Copy::copy($file,$dest);
1148: &renderpage($request,$dest);
1149: return;
1150: }
1151:
1152: my ($extension) = ($request->uri =~ m/\.(\w+)$/);
1153: &Apache::lonxml::debug("Looking for :$extension:");
1154: my $templatelist=&get_template_list($extension);
1155: if ($env{'form.newfile'} && !$templatelist) {
1156: # no templates found
1157: my $templatefilename =
1158: $request->dir_config('lonIncludes').'/templates/blank.'.$extension;
1159: &Apache::lonxml::debug("$templatefilename");
1160: my $dest = &Apache::lonnet::filelocation("",$request->uri);
1161: &File::Copy::copy($templatefilename,$dest);
1162: &renderpage($request,$dest);
1163: } else {
1164: my $url=&HTML::Entities::encode($request->uri,'<>&"');
1165: my $shownurl=$url;
1166: $shownurl=~s-^/~-/priv/-;
1167: my $dest = &Apache::lonnet::filelocation("",$request->uri);
1168: my $errormsg;
1169: my $instructions;
1170: my $start_page =
1171: &Apache::loncommon::start_page("Create New $extension");
1172: $request->print("
1173: $start_page
1174: <h1>".&mt("Creating a new $extension resource.")."</h1>
1175: $errormsg
1176: ".&mt("The requested file [_1] currently does not exist.",
1177: "<tt>$shownurl</tt>")."
1178: <p>
1179: <b>
1180: ".&mt("To create a new $extension, select a template from the".
1181: " list below. Then click on the \"Create $extension\" button.")."</b>
1182: </p><form action=\"$url\" method=\"POST\">");
1183:
1184: if (defined($templatelist)) {
1185: $request->print($templatelist);
1186: }
1187: $request->print('<br /><input type="submit" name="newfile" value="'.
1188: &mt("Create $extension").'" />');
1189: $request->print("</form></p>".&Apache::loncommon::end_page());
1190: }
1191: return;
1192: }
1193:
1194: sub update_construct_style {
1195: if ($env{'request.state'} eq "construct"
1196: && $env{'form.problemmode'} eq 'view'
1197: && defined($env{'form.submitted'})
1198: && !defined($env{'form.resetdata'})
1199: && !defined($env{'form.newrandomization'})) {
1200: if ((!$env{'form.style_file'} && $env{'construct.style'})
1201: ||$env{'form.clear_style_file'}) {
1202: &Apache::lonnet::delenv('construct\\.style');
1203: } elsif ($env{'form.style_file'}
1204: && $env{'construct.style'} ne $env{'form.style_file'}) {
1205: &Apache::lonnet::appenv({'construct.style' =>
1206: $env{'form.style_file'}});
1207: }
1208: }
1209: }
1210:
1211:
1212: sub handler {
1213: #my $t0 = [&gettimeofday()];
1214: my $request=$_[0];
1215: $Apache::lonxml::request=$request;
1216: $Apache::lonxml::debug=$env{'user.debug'};
1217: $env{'request.uri'}=$request->uri;
1218: &setuppermissions();
1219:
1220: my $file=&Apache::lonnet::filelocation("",$request->uri);
1221:
1222: #check if we know where we are
1223: if ($env{'request.course.fn'} && !&Apache::lonnet::symbread()) {
1224: # if we are browsing we might not be able to know where we are
1225: if ($Apache::lonhomework::browse ne 'F' &&
1226: $env{'request.state'} ne "construct") {
1227: #should know where we are, so ask
1228: &unset_permissions();
1229: $request->internal_redirect('/adm/ambiguous');
1230: return OK;
1231: }
1232: }
1233: if (&setupheader($request)) {
1234: &unset_permissions();
1235: return OK;
1236: }
1237: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:$Apache::lonhomework::modifygrades:$Apache::lonhomework::queuegrade");
1238: &Apache::lonxml::debug("Problem Mode ".$env{'form.problemmode'});
1239: my ($symb) = &Apache::lonnet::whichuser();
1240: &Apache::lonxml::debug('symb is '.$symb);
1241: if ($env{'request.state'} eq "construct") {
1242: if ( -e $file ) {
1243: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1244: ['problemmode']);
1245: if (!(defined $env{'form.problemmode'})) {
1246: #first visit to problem in construction space
1247: $env{'form.problemmode'}= 'view';
1248: &renderpage($request,$file);
1249: } elsif ($env{'form.problemmode'} eq 'editxml') {
1250: &editxmlmode($request,$file);
1251: } elsif ($env{'form.problemmode'} eq 'calcanswers') {
1252: &analyze($request,$file);
1253: } else {
1254: &update_construct_style();
1255: &renderpage($request,$file);
1256: }
1257: } else {
1258: # requested file doesn't exist in contruction space
1259: &newproblem($request);
1260: }
1261: } else {
1262: # just render the page normally outside of construction space
1263: &Apache::lonxml::debug("not construct");
1264: &renderpage($request,$file);
1265: }
1266: #my $td=&tv_interval($t0);
1267: #&Apache::lonxml::debug("Spent $td seconds processing");
1268: # always turn off debug messages
1269: $Apache::lonxml::debug=0;
1270: &unset_permissions();
1271: return OK;
1272:
1273: }
1274:
1275: 1;
1276: __END__
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