1: # The LearningOnline Network with CAPA
2: # The LON-CAPA Homework handler
3: #
4: # $Id: lonhomework.pm,v 1.145 2003/09/18 19:59:15 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # Guy Albertelli
29: # 11/30 Gerd Kortemeyer
30: # 6/1,8/17,8/18 Gerd Kortemeyer
31: # 7/18 Jeremy Bowers
32:
33: package Apache::lonhomework;
34: use strict;
35: use Apache::style();
36: use Apache::lonxml();
37: use Apache::lonnet();
38: use Apache::lonplot();
39: use Apache::inputtags();
40: use Apache::structuretags();
41: use Apache::randomlabel();
42: use Apache::response();
43: use Apache::hint();
44: use Apache::outputtags();
45: use Apache::caparesponse();
46: use Apache::radiobuttonresponse();
47: use Apache::optionresponse();
48: use Apache::imageresponse();
49: use Apache::essayresponse();
50: use Apache::externalresponse();
51: use Apache::rankresponse();
52: use Apache::matchresponse();
53: use Apache::chemresponse();
54: use Apache::Constants qw(:common);
55: use HTML::Entities();
56: use Apache::loncommon();
57: #use Time::HiRes qw( gettimeofday tv_interval );
58:
59: BEGIN {
60: &Apache::lonxml::register_insert();
61: }
62:
63: sub get_target {
64: if (($ENV{'request.state'} eq "published") ||
65: ($ENV{'request.state'} eq "uploaded")) {
66: if ( defined($ENV{'form.grade_target'} )
67: && ($ENV{'form.grade_target'} eq 'tex')) {
68: return ($ENV{'form.grade_target'});
69: } elsif ( defined($ENV{'form.grade_target'} )
70: && ($Apache::lonhomework::viewgrades eq 'F' )) {
71: return ($ENV{'form.grade_target'});
72: }
73:
74: if ( defined($ENV{'form.submitted'}) &&
75: ( !defined($ENV{'form.resetdata'})) &&
76: ( !defined($ENV{'form.newrandomization'}))) {
77: return ('grade', 'web');
78: } else {
79: return ('web');
80: }
81: } elsif ($ENV{'request.state'} eq "construct") {
82: if ( defined($ENV{'form.grade_target'}) ) {
83: return ($ENV{'form.grade_target'});
84: }
85: if ( defined($ENV{'form.preview'})) {
86: if ( defined($ENV{'form.submitted'})) {
87: return ('grade', 'web');
88: } else {
89: return ('web');
90: }
91: } else {
92: if ( $ENV{'form.problemmode'} eq 'View' ||
93: $ENV{'form.problemmode'} eq 'Discard Edits and View') {
94: if ( defined($ENV{'form.submitted'}) &&
95: (!defined($ENV{'form.resetdata'})) &&
96: (!defined($ENV{'form.newrandomization'}))) {
97: return ('grade', 'web','answer');
98: } else {
99: return ('web','answer');
100: }
101: } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
102: if ( $ENV{'form.submitted'} eq 'edit' ) {
103: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
104: return ('modified','web','answer');
105: } else {
106: return ('modified','edit');
107: }
108: } else {
109: return ('edit');
110: }
111: } else {
112: return ('web');
113: }
114: }
115: }
116: return ();
117: }
118:
119: sub setup_vars {
120: my ($target) = @_;
121: return ';'
122: # return ';$external::target='.$target.';';
123: }
124:
125: sub send_header {
126: my ($request)= @_;
127: $request->print(&Apache::lontexconvert::header());
128: # $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
129: }
130:
131: sub createmenu {
132: my ($which,$request)=@_;
133: if ($which eq 'grade') {
134: $request->print('<script language="JavaScript">
135: hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
136: "height=350,width=150,menubar=no");
137: </script>');
138: }
139: }
140:
141: sub send_footer {
142: my ($request)= @_;
143: # $request->print('</form>');
144: $request->print(&Apache::lontexconvert::footer());
145: }
146:
147: $Apache::lonxml::browse='';
148:
149: # JB, 9/24/2002: Any changes in this function may require a change
150: # in lonnavmaps::resource::getDateStatus.
151: sub check_access {
152: my ($id) = @_;
153: my $date ='';
154: my $status;
155: my $datemsg = '';
156: my $lastdate = '';
157: my $temp;
158: my $type;
159: my $passed;
160:
161: if ($ENV{'request.state'} eq "construct") {
162: &Apache::lonxml::debug("in construction ignoring dates");
163: $status='CAN_ANSWER';
164: $datemsg='is in under construction';
165: return ($status,$datemsg);
166: }
167:
168: &Apache::lonxml::debug("checking for part :$id:");
169: &Apache::lonxml::debug("time:".time);
170: foreach $temp ("opendate","duedate","answerdate") {
171: $lastdate = $date;
172: $date = &Apache::lonnet::EXT("resource.$id.$temp");
173: my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
174: if ($thistype =~ /^(con_lost|no_such_host)/ ||
175: $date =~ /^(con_lost|no_such_host)/) {
176: $status='UNAVAILABLE';
177: $date="may open later.";
178: return($status,$date);
179: }
180: if ($thistype eq 'date_interval') {
181: if ($temp eq 'opendate') {
182: $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
183: }
184: if ($temp eq 'answerdate') {
185: $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
186: }
187: }
188: &Apache::lonxml::debug("found :$date: for :$temp:");
189: if ($date eq '') {
190: $date = "an unknown date"; $passed = 0;
191: } elsif ($date eq 'con_lost') {
192: $date = "an indeterminate date"; $passed = 0;
193: } else {
194: if (time < $date) { $passed = 0; } else { $passed = 1; }
195: $date = localtime $date;
196: }
197: if (!$passed) { $type=$temp; last; }
198: }
199: &Apache::lonxml::debug("have :$type:$passed:");
200: if ($passed) {
201: $status='SHOW_ANSWER';
202: $datemsg=$date;
203: } elsif ($type eq 'opendate') {
204: $status='CLOSED';
205: $datemsg = "will open on $date";
206: } elsif ($type eq 'duedate') {
207: $status='CAN_ANSWER';
208: $datemsg = "is due at $date";
209: } elsif ($type eq 'answerdate') {
210: $status='CLOSED';
211: $datemsg = "was due on $lastdate, and answers will be available on $date";
212: }
213: if ($status eq 'CAN_ANSWER') {
214: #check #tries, and if correct.
215: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
216: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
217: if ( $tries eq '' ) { $tries = '0'; }
218: if ( $maxtries eq '' ) { $maxtries = '2'; }
219: if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
220: # if (correct and show prob status) or excused then CANNOT_ANSWER
221: if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
222: &&
223: lc($Apache::lonhomework::problemstatus) ne 'no')
224: ||
225: $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
226: $status = 'CANNOT_ANSWER';
227: }
228: }
229:
230: #if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
231: # (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
232: # return ('UNCHECKEDOUT','needs to be checked out');
233: #}
234:
235:
236: &Apache::lonxml::debug("sending back :$status:$datemsg:");
237: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
238: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
239: $status='CAN_ANSWER';
240: $datemsg='is closed but you are allowed to view it';
241: }
242:
243: return ($status,$datemsg);
244: }
245:
246: sub showhash {
247: my (%hash) = @_;
248: &showhashsubset(\%hash,'.');
249: return '';
250: }
251:
252: sub showarray {
253: my ($array)=@_;
254: my $string="(";
255: foreach my $elm (@{ $array }) {
256: if (ref($elm)) {
257: if ($elm =~ /ARRAY/ ) {
258: $string.=&showarray($elm);
259: }
260: } else {
261: $string.="$elm,"
262: }
263: }
264: chop($string);
265: $string.=")";
266: return $string;
267: }
268:
269: sub showhashsubset {
270: my ($hash,$keyre) = @_;
271: my $resultkey;
272: foreach $resultkey (sort keys %$hash) {
273: if ($resultkey =~ /$keyre/) {
274: if (ref($$hash{$resultkey})) {
275: if ($$hash{$resultkey} =~ /ARRAY/ ) {
276: &Apache::lonxml::debug("$resultkey ---- ".
277: &showarray($$hash{$resultkey}));
278: } elsif ($$hash{$resultkey} =~ /HASH/ ) {
279: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
280: &showhashsubset($$hash{$resultkey},'.');
281: } else {
282: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
283: }
284: } else {
285: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
286: }
287: }
288: }
289: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
290: return '';
291: }
292:
293: sub setuppermissions {
294: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
295: my $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
296: if (! $viewgrades &&
297: exists($ENV{'request.course.sec'}) &&
298: $ENV{'request.course.sec'} !~ /^\s*$/) {
299: $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'}.
300: '/'.$ENV{'request.course.sec'});
301: }
302: $Apache::lonhomework::viewgrades = $viewgrades;
303: return ''
304: }
305:
306: sub setupheader {
307: my $request=$_[0];
308: if ($ENV{'browser.mathml'}) {
309: $request->content_type('text/xml');
310: } else {
311: $request->content_type('text/html');
312: }
313: $request->content_encoding('UTF-8');
314: if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
315: &Apache::loncommon::no_cache($request);
316: }
317: $request->send_http_header;
318: return OK if $request->header_only;
319: return ''
320: }
321:
322: sub handle_save_or_undo {
323: my ($request,$problem,$result) = @_;
324: my $file = &Apache::lonnet::filelocation("",$request->uri);
325: my $filebak =$file.".bak";
326: my $filetmp =$file.".tmp";
327: my $error=0;
328:
329: if ($ENV{'form.Undo'} eq 'undo') {
330: my $error=0;
331: if (!copy($file,$filetmp)) { $error=1; }
332: if ((!$error) && (!copy($filebak,$file))) { $error=1; }
333: if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
334: if (!$error) {
335: $request->print("<p><b>Undid changes, Switched $filebak and $file</b></p>");
336: } else {
337: $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");
338: $error=1;
339: }
340: } else {
341: my $fs=Apache::File->new(">$filebak");
342: if (defined($fs)) {
343: print $fs $$problem;
344: $request->print("<b>Making Backup to $filebak</b><br />");
345: } else {
346: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");
347: $error=2;
348: }
349: my $fh=Apache::File->new(">$file");
350: if (defined($fh)) {
351: print $fh $$result;
352: $request->print("<b>Saving Modifications to $file</b><br />");
353: } else {
354: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");
355: $error|=4;
356: }
357: }
358: return $error;
359: }
360:
361: sub analyze_header {
362: my ($request) = @_;
363: my $result.='<html>
364: <head><title>Analyzing a problem</title></head>
365: <body bgcolor="#FFFFFF">
366: <form name="lonhomework" method="POST" action="'.
367: $ENV{'request.uri'}.'">
368: <input type="submit" name="problemmode" value="EditXML" />
369: <input type="submit" name="problemmode" value="Edit" />
370: <hr />
371: <input type="submit" name="submit" value="View" />
372: <hr />
373: List of possible answers:
374: </form>';
375: $request->print($result);
376: $request->rflush();
377: }
378:
379: sub analyze_footer {
380: my ($request) = @_;
381: my $result='</body></html>';
382: $request->print($result);
383: $request->rflush();
384: }
385:
386: sub analyze {
387: my ($request,$file) = @_;
388: &Apache::lonxml::debug("Analyze");
389: my $result;
390: my %overall;
391: my %allparts;
392: my $rndseed=$ENV{'form.rndseed'};
393: &analyze_header($request);
394: my %prog_state=
395: &Apache::lonhtmlcommon::Create_PrgWin($request,'Analyze Progress',
396: 'Getting Problem Variants',
397: $ENV{'form.numtoanalyze'});
398: for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {
399: &Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
400: 'last problem');
401: my $subresult=&Apache::lonnet::ssi($request->uri,
402: ('grade_target' => 'analyze'),
403: ('rndseed' => $i+$rndseed));
404: (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
405: my %analyze=&Apache::lonnet::str2hash($subresult);
406: my @parts;
407: if (defined(@{ $analyze{'parts'} })) {
408: @parts=@{ $analyze{'parts'} };
409: }
410: foreach my $part (@parts) {
411: if (!exists($allparts{$part})) {$allparts{$part}=1;};
412: if ($analyze{$part.'.type'} eq 'numericalresponse' ||
413: $analyze{$part.'.type'} eq 'stringresponse' ||
414: $analyze{$part.'.type'} eq 'formularesponse' ) {
415: push( @{ $overall{$part.'.answer'} },
416: [@{ $analyze{$part.'.answer'} }]);
417: }
418: }
419: }
420: &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
421: 'Analyzing Results');
422: foreach my $part (sort(keys(%allparts))) {
423: if (defined(@{ $overall{$part.'.answer'} })) {
424: my $num_cols=scalar(@{ $overall{$part.'.answer'}->[0] });
425: $request->print('<table><tr><td colspan="'.($num_cols+1).'">Part '.$part.'</td></tr>');
426: my %frequency;
427: foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
428: $frequency{join("\0",@{ $answer })}++;
429: }
430: $request->print('<tr><td colspan="'.($num_cols).'">Answer</td><td>Frequency</td></tr>');
431: foreach my $answer (sort {(split("\0",$a))[0] <=> (split("\0",$b))[0]} (keys(%frequency))) {
432: $request->print('<tr><td align="right">'.
433: join('</td><td align="right">',split("\0",$answer)).
434: '</td><td>('.$frequency{$answer}.
435: ')</td></tr>');
436: }
437: $request->print('</table>');
438: } else {
439: $request->print('<p>Part '.$part.
440: ' is not analyzable at this time</p>');
441: }
442: }
443: if (scalar(keys(%allparts)) == 0 ) {
444: $request->print('<p>Found no analyzable parts in this problem,
445: currently only Numerical, Formula and String response
446: styles are supported.</p>');
447: }
448: &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
449: &analyze_footer($request);
450: &Apache::lonhomework::showhash(%overall);
451: return $result;
452: }
453:
454: sub editxmlmode {
455: my ($request,$file) = @_;
456: my $result;
457: my $problem=&Apache::lonnet::getfile($file);
458: if ($problem eq -1) {
459: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
460: $problem='';
461: }
462: if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
463: my $error=&handle_save_or_undo($request,\$problem,
464: \$ENV{'form.editxmltext'});
465: if (!$error) { $problem=&Apache::lonnet::getfile($file); }
466: }
467: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
468: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
469: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
470: $ENV{'form.problemmode'}='View';
471: &renderpage($request,$file);
472: } else {
473: my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
474: my $xml_help = Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
475: "Problem Editing Help");
476: if ($cols > 80) { $cols = 80; }
477: if ($cols < 70) { $cols = 70; }
478: if ($rows < 20) { $rows = 20; }
479: $result.='<html><body bgcolor="#FFFFFF">
480: <form name="lonhomework" method="POST" action="'.
481: $ENV{'request.uri'}.'">
482: <input type="hidden" name="problemmode" value="EditXML" />
483: <input type="submit" name="problemmode" value="Discard Edits and View" />
484: <input type="submit" name="problemmode" value="Edit" />
485: <hr />
486: <input type="submit" name="submit" value="Submit Changes" />
487: <input type="submit" name="submit" value="Submit Changes and View" />
488: <input type="submit" name="Undo" value="undo" />
489: <hr />
490: ' . $xml_help . '
491: <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
492: &HTML::Entities::encode($problem).'</textarea>
493: </form></body></html>';
494: $request->print($result);
495: }
496: return '';
497: }
498:
499: sub renderpage {
500: my ($request,$file) = @_;
501:
502: my (@targets) = &get_target();
503: &Apache::lonxml::debug("Running targets ".join(':',@targets));
504: foreach my $target (@targets) {
505: #my $t0 = [&gettimeofday()];
506: my $problem=&Apache::lonnet::getfile($file);
507: if ($problem eq -1) {
508: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
509: $problem='';
510: }
511:
512: my %mystyle;
513: my $result = '';
514: if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
515: if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
516: if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}
517:
518: &Apache::lonxml::debug("Should be parsing now");
519: $result = &Apache::lonxml::xmlparse($request, $target, $problem,
520: &setup_vars($target),%mystyle);
521: undef($Apache::lonhomework::parsing_a_problem);
522: #$request->print("Result follows:");
523: if ($target eq 'modified') {
524: &handle_save_or_undo($request,\$problem,\$result);
525: } else {
526: if ($target eq 'analyze') {
527: $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
528: undef(%Apache::lonhomework::analyze);
529: }
530: #my $td=&tv_interval($t0);
531: #if ( $Apache::lonxml::debug) {
532: #$result =~ s:</body>::;
533: #$result.="<br />Spent $td seconds processing target $target\n</body>";
534: #}
535: $request->print($result);
536: $request->rflush();
537: }
538: #$request->print(":Result ends");
539: #my $td=&tv_interval($t0);
540: }
541: }
542:
543: # with no arg it returns a HTML <option> list of the template titles
544: # with one arg it returns the filename associated with the arg passed
545: sub get_template_list {
546: my ($namewanted,$extension) = @_;
547: my $result;
548: my @allnames;
549: &Apache::lonxml::debug("Looking for :$extension:");
550: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
551: my $name=&Apache::lonnet::metadata($file,'title');
552: if ($namewanted && ($name eq $namewanted)) {
553: $result=$file;
554: last;
555: } else {
556: if ($name) { push (@allnames, $name); }
557: }
558: }
559: if (@allnames && !$result) {
560: $result="<option>Select a $extension template</option>\n<option>".
561: join('</option><option>',sort(@allnames)).'</option>';
562: }
563: return $result;
564: }
565:
566: sub newproblem {
567: my ($request) = @_;
568: my $extension=$request->uri;
569: $extension=~s:^.*\.([\w]+)$:$1:;
570: &Apache::lonxml::debug("Looking for :$extension:");
571: my $templatelist=&get_template_list('',$extension);
572: if ($ENV{'form.template'} &&
573: $ENV{'form.template'} ne "Select a $extension template") {
574: use File::Copy;
575: my $file = &get_template_list($ENV{'form.template'},$extension);
576: my $dest = &Apache::lonnet::filelocation("",$request->uri);
577: copy($file,$dest);
578: &renderpage($request,$dest);
579: } elsif($ENV{'form.newfile'} && !$templatelist) {
580: # I don't like hard-coded filenames but for now, this will work.
581: use File::Copy;
582: my $templatefilename =
583: $request->dir_config('lonIncludes').'/templates/blank.problem';
584: &Apache::lonxml::debug("$templatefilename");
585: my $dest = &Apache::lonnet::filelocation("",$request->uri);
586: copy($templatefilename,$dest);
587: &renderpage($request,$dest);
588: } else {
589: my $url=$request->uri;
590: my $dest = &Apache::lonnet::filelocation("",$request->uri);
591: my $errormsg;
592: if ($ENV{'form.newfile'}) {
593: $errormsg='<p><font color="red">You did not select a template.</font></p>'."\n";
594: }
595: my $instructions;
596: if ($templatelist) { $instructions=", select a template from the pull-down menu below.<br />Then";}
597: $request->print(<<ENDNEWPROBLEM);
598: <body bgcolor="#FFFFFF">
599: <h1>Creating a new $extension resource</h1>
600: $errormsg
601: The requested file <tt>$url</tt> currently does not exist.
602: <p>
603: <b>To create a new $extension$instructions click on the "Create $extension" button.</b>
604: </p>
605: <p><form action="$url" method="POST">
606: ENDNEWPROBLEM
607: if (defined($templatelist)) {
608: $request->print("<select name=\"template\">$templatelist</select>");
609: }
610: $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"Create $extension\" />");
611: $request->print("</form></p></body>");
612: }
613: return '';
614: }
615:
616: sub view_or_edit_menu {
617: my ($request) = @_;
618: my $url=$request->uri;
619: $request->print(<<EDITMENU);
620: <body bgcolor="#FFFFFF">
621: <form action="$url" method="POST">
622: Would you like to <input type="submit" name="problemmode" value="View"> or
623: <input type="submit" name="problemmode" value="Edit"> the problem.
624: </form>
625: </body>
626: EDITMENU
627: }
628:
629: sub handler {
630: #my $t0 = [&gettimeofday()];
631: my $request=$_[0];
632:
633: $Apache::lonxml::debug=$ENV{'user.debug'};
634:
635: if (&setupheader($request)) { return OK; }
636: $ENV{'request.uri'}=$request->uri;
637:
638: #setup permissions
639: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
640: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
641: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
642: # some times multiple problemmodes are submitted, need to select
643: # the last one
644: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
645: if ( defined($ENV{'form.problemmode'}) &&
646: ref($ENV{'form.problemmode'}) ) {
647: &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
648: my $mode=$ENV{'form.problemmode'}->[-1];
649: undef $ENV{'form.problemmode'};
650: $ENV{'form.problemmode'}=$mode;
651: }
652: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
653: my $file=&Apache::lonnet::filelocation("",$request->uri);
654:
655: #check if we know where we are
656: if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {
657: # if we are browsing we might not be able to know where we are
658: if ($Apache::lonhomework::browse ne 'F') {
659: #should know where we are, so ask
660: if ( &Apache::lonnet::mod_perl_version() == 2 ) {
661: &Apache::lonnet::cleanenv();
662: }
663: $request->internal_redirect('/adm/ambiguous'); return;
664: }
665: }
666:
667: my ($symb) = &Apache::lonxml::whichuser();
668: &Apache::lonxml::debug('symb is '.$symb);
669: if ($ENV{'request.state'} eq "construct" || $symb eq '') {
670: if ($ENV{'form.resetdata'} eq 'Reset Submissions' ||
671: $ENV{'form.resetdata'} eq 'New Problem Variation' ||
672: $ENV{'form.newrandomization'} eq 'New Randomization') {
673: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
674: &Apache::lonnet::tmpreset($symb,'',$domain,$name);
675: &Apache::lonxml::debug("Attempt reset");
676: }
677: }
678: if ($ENV{'request.state'} eq "construct") {
679: if ( -e $file ) {
680: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
681: ['problemmode']);
682: if (!(defined $ENV{'form.problemmode'})) {
683: #first visit to problem in construction space
684: #&view_or_edit_menu($request);
685: $ENV{'form.problemmode'}='View';
686: &renderpage($request,$file);
687: } elsif ($ENV{'form.problemmode'} eq 'EditXML') {
688: &editxmlmode($request,$file);
689: } elsif ($ENV{'form.problemmode'} eq 'Calculate answers') {
690: &analyze($request,$file);
691: } else {
692: &renderpage($request,$file);
693: }
694: } else {
695: # requested file doesn't exist in contruction space
696: &newproblem($request);
697: }
698: } else {
699: # just render the page normally outside of construction space
700: &Apache::lonxml::debug("not construct");
701: &renderpage($request,$file);
702: }
703: #my $td=&tv_interval($t0);
704: #&Apache::lonxml::debug("Spent $td seconds processing");
705: # &Apache::lonhomework::send_footer($request);
706: # always turn off debug messages
707: $Apache::lonxml::debug=0;
708: return OK;
709:
710: }
711:
712: 1;
713: __END__
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