1: # The LearningOnline Network with CAPA
2: # The LON-CAPA Homework handler
3: #
4: # $Id: lonhomework.pm,v 1.63 2001/11/29 18:36:59 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # Guy Albertelli
29: # 11/30 Gerd Kortemeyer
30: # 6/1,8/17,8/18 Gerd Kortemeyer
31:
32: package Apache::lonhomework;
33: use strict;
34: use Apache::style;
35: use Apache::lonxml;
36: use Apache::lonnet;
37: use Apache::inputtags;
38: use Apache::structuretags;
39: use Apache::randomlabel;
40: use Apache::response;
41: use Apache::hint;
42: use Apache::outputtags;
43: use Apache::Constants qw(:common);
44: #use Time::HiRes qw( gettimeofday tv_interval );
45:
46: sub BEGIN {
47: &Apache::lonxml::register_insert();
48: }
49:
50: sub get_target {
51: if ( $ENV{'request.state'} eq "published") {
52: if ( defined($ENV{'form.submitted'})) {
53: return ('grade', 'web');
54: } else {
55: return ('web');
56: }
57: } elsif ($ENV{'request.state'} eq "construct") {
58: if ( defined($ENV{'form.preview'})) {
59: if ( defined($ENV{'form.submitted'})) {
60: return ('grade', 'web');
61: } else {
62: return ('web');
63: }
64: } else {
65: if ( $ENV{'form.problemmode'} eq 'View' ) {
66: if ( defined($ENV{'form.submitted'}) &&
67: (!defined($ENV{'form.resetdata'})) ) {
68: return ('grade', 'web','answer');
69: } else {
70: return ('web','answer');
71: }
72: } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
73: if ( $ENV{'form.submitted'} eq 'edit' ) {
74: return ('modified','edit');
75: } else {
76: return ('edit');
77: }
78: } else {
79: return ('web');
80: }
81: }
82: }
83: return ();
84: }
85:
86: sub setup_vars {
87: my ($target) = @_;
88: return ';'
89: # return ';$external::target='.$target.';';
90: }
91:
92: sub send_header {
93: my ($request)= @_;
94: $request->print(&Apache::lontexconvert::header());
95: # $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
96: }
97:
98: sub createmenu {
99: my ($which,$request)=@_;
100: if ($which eq 'grade') {
101: $request->print('<script language="JavaScript">
102: hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
103: "height=350,width=150,menubar=no");
104: </script>');
105: }
106: }
107:
108: sub send_footer {
109: my ($request)= @_;
110: # $request->print('</form>');
111: $request->print(&Apache::lontexconvert::footer());
112: }
113:
114: $Apache::lonxml::browse='';
115:
116: sub check_access {
117: my ($id) = @_;
118: my $date ='';
119: my $status = '';
120: my $datemsg = '';
121: my $lastdate = '';
122: my $temp;
123: my $type;
124: my $passed;
125: &Apache::lonxml::debug("checking for part :$id:");
126: foreach $temp ("opendate","duedate","answerdate") {
127: $lastdate = $date;
128: $date = &Apache::lonnet::EXT("resource.$id.$temp");
129: &Apache::lonxml::debug("found :$date: for :$temp:");
130: if ($date eq '') {
131: $date = "an unknown date"; $passed = 0;
132: } elsif ($date eq 'con_lost') {
133: $date = "an indeterminate date"; $passed = 0;
134: } else {
135: if (time < $date) { $passed = 0; } else { $passed = 1; }
136: $date = localtime $date;
137: }
138: if (!$passed) { $type=$temp; last; }
139: }
140: &Apache::lonxml::debug("have :$type:$passed:");
141: if ($passed) {
142: $status='SHOW_ANSWER';
143: $datemsg=$date;
144: } elsif ($type eq 'opendate') {
145: $status='CLOSED';
146: $datemsg = "will open on $date";
147: } elsif ($type eq 'duedate') {
148: $status='CAN_ANSWER';
149: $datemsg = "is due at $date";
150: } elsif ($type eq 'answerdate') {
151: $status='CLOSED';
152: $datemsg = "was due on $lastdate, and answers will be available on $date";
153: }
154: if ($status eq 'CAN_ANSWER') {
155: #check #tries
156: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
157: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
158: if ( $tries eq '' ) { $tries = '0'; }
159: if ( $maxtries eq '' ) { $maxtries = '2'; }
160: if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
161: }
162:
163: if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
164: (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
165: return ('UNCHECKEDOUT','needs to be checked out');
166: }
167:
168:
169: &Apache::lonxml::debug("sending back :$status:$datemsg:");
170: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
171: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
172: $status='CAN_ANSWER';
173: $datemsg='is closed but you are allowed to view it';
174: }
175: if ($ENV{'request.state'} eq "construct") {
176: &Apache::lonxml::debug("in construction ignoring dates");
177: $status='CAN_ANSWER';
178: $datemsg='is in under construction';
179: }
180: return ($status,$datemsg);
181: }
182:
183: sub showhash {
184: my (%hash) = @_;
185: my $resultkey;
186: foreach $resultkey (sort keys %hash) {
187: &Apache::lonxml::debug("$resultkey ---- $hash{$resultkey}");
188: }
189: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
190: return '';
191: }
192:
193: sub setuppermissions {
194: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
195: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
196: return ''
197: }
198:
199: sub setupheader {
200: my $request=$_[0];
201: if ($ENV{'browser.mathml'}) {
202: $request->content_type('text/xml');
203: } else {
204: $request->content_type('text/html');
205: }
206: &Apache::loncommon::no_cache($request);
207: $request->send_http_header;
208: return OK if $request->header_only;
209: return ''
210: }
211:
212: sub handle_save_or_undo {
213: my ($request,$problem,$result) = @_;
214: my $fileout = &Apache::lonnet::filelocation("",$request->uri);
215: my $filesave=$fileout.".bak";
216:
217: if ($ENV{'form.Undo'} eq 'undo') {
218: if (copy($filesave,$fileout)) {
219: $request->print("<b>Undid changes, Copied $filesave to $fileout<br /></b>");
220: } else {
221: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to undo, unable to copy $filesave to $fileout<br /></b></font>");
222: }
223: } else {
224: my $fs=Apache::File->new(">$filesave");
225: if (defined($fs)) {
226: print $fs $$problem;
227: $request->print("<b>Making Backup to $filesave</b><br />");
228: } else {
229: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filesave</b></font>");
230: }
231: my $fh=Apache::File->new(">$fileout");
232: if (defined($fh)) {
233: print $fh $$result;
234: $request->print("<b>Saving Modifications to $fileout</b><br />");
235: } else {
236: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $fileout</b></font>");
237: }
238: }
239: }
240:
241: sub renderpage {
242: my ($request,$file) = @_;
243:
244: my (@targets) = &get_target();
245: foreach my $target (@targets) {
246: #my $t0 = [&gettimeofday()];
247: my $problem=&Apache::lonnet::getfile($file);
248: if ($problem == -1) {
249: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
250: $problem='';
251: }
252:
253: my %mystyle;
254: my $result = '';
255: &Apache::inputtags::initialize_inputtags;
256: &Apache::edit::initialize_edit;
257: if ($target eq 'web') {
258: if (&Apache::lonnet::symbread() eq '') {
259: if ($ENV{'request.state'} eq "construct") {
260: } else {
261: $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored<br />");
262: }
263: }
264: #if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }
265: }
266: if ($target eq 'grade') { &showhash(%Apache::lonhomework::history); }
267:
268: my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
269: if ($default == -1) {
270: &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");
271: $default='';
272: }
273: $result = &Apache::lonxml::xmlparse($target, $problem,
274: $default.&setup_vars($target),%mystyle);
275:
276: #$request->print("Result follows:");
277: if ($target eq 'modified') {
278: &handle_save_or_undo($request,\$problem,\$result);
279: } else {
280: #my $td=&tv_interval($t0);
281: #if ( $Apache::lonxml::debug) {
282: #$result =~ s:</body>::;
283: #$result.="<br />Spent $td seconds processing target $target\n</body>";
284: #}
285: $request->print($result);
286: }
287: #$request->print(":Result ends");
288: #my $td=&tv_interval($t0);
289: }
290: }
291:
292: # with no arg it returns a HTML <option> list of the template titles
293: # with one arg it returns the filename associated with the arg passed
294: sub get_template_list {
295: my ($namewanted,$extension) = @_;
296: my $result;
297: &Apache::lonxml::debug("Looking for :$extension:");
298: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
299: my $name=&Apache::lonnet::metadata($file,'title');
300: if ($namewanted && ($name eq $namewanted)) {
301: $result=$file;
302: last;
303: } else {
304: $result.="<option>$name</option>";
305: }
306: }
307: return $result;
308: }
309:
310: sub newproblem {
311: my ($request) = @_;
312:
313: my $extension=$request->uri;
314: $extension=~s:^.*\.([\w]+)$:$1:;
315: &Apache::lonxml::debug("Looking for :$extension:");
316: if ($ENV{'form.template'}) {
317: use File::Copy;
318: my $file = &get_template_list($ENV{'form.template'},$extension);
319: my $dest = &Apache::lonnet::filelocation("",$request->uri);
320: copy($file,$dest);
321: &renderpage($request,$file);
322: } else {
323: my $templatelist=&get_template_list('',$extension);
324: my $url=$request->uri;
325: my $dest = &Apache::lonnet::filelocation("",$request->uri);
326: $request->print(<<ENDNEWPROBLEM);
327: <body bgcolor="#FFFFFF">
328: The request file $url doesn\'t exist. You can create a new $extension <br />
329: <form action="$url" method="POST">
330: <input type="submit" value="New $extension"><br />
331: <select name="template">
332: $templatelist
333: </select>
334: </form>
335: </body>
336: ENDNEWPROBLEM
337: }
338:
339: return '';
340: }
341:
342: sub view_or_edit_menu {
343: my ($request) = @_;
344: my $url=$request->uri;
345: $request->print(<<EDITMENU);
346: <body bgcolor="#FFFFFF">
347: <form action="$url" method="POST">
348: Would you like to <input type="submit" name="problemmode" value="View"> or
349: <input type="submit" name="problemmode" value="Edit"> the problem.
350: </form>
351: </body>
352: EDITMENU
353: }
354:
355: sub handler {
356: #my $t0 = [&gettimeofday()];
357: my $request=$_[0];
358:
359: if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}
360:
361: if (&setupheader($request)) { return OK; }
362: $ENV{'request.uri'}=$request->uri;
363:
364: #setup permissions
365: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
366: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
367: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
368:
369: my $file=&Apache::lonnet::filelocation("",$request->uri);
370:
371: #check if we know where we are
372: if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {
373: # if we are browsing we might not be able to know where we are
374: if ($Apache::lonhomework::browse ne 'F') {
375: #should know where we are, so ask
376: $request->internal_redirect('/adm/ambiguous'); return;
377: }
378: }
379:
380: if ($ENV{'request.state'} eq "construct") {
381: if ($ENV{'form.resetdata'} eq 'Reset Submissions') {
382: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
383: &Apache::lonnet::tmpreset($symb,'',$domain,$name);
384: }
385: if ( -e $file ) {
386: if (!(defined $ENV{'form.problemmode'})) {
387: #first visit to problem in construction space
388: &view_or_edit_menu($request);
389: #&renderpage($request,$file);
390: } else {
391: &renderpage($request,$file);
392: }
393: } else {
394: # requested file doesn't exist in contruction space
395: &newproblem($request);
396: }
397: } else {
398: # just render the page normally outside of construction space
399: &renderpage($request,$file);
400: }
401: #my $td=&tv_interval($t0);
402: #&Apache::lonxml::debug("Spent $td seconds processing");
403: # &Apache::lonhomework::send_footer($request);
404: # always turn off debug messages
405: $Apache::lonxml::debug=0;
406: return OK;
407:
408: }
409:
410: 1;
411: __END__
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