1: # The LON-CAPA Homework handler
2: # Guy Albertelli
3: # 11/30 Gerd Kortemeyer
4: # 6/1 Gerd Kortemeyer
5:
6: package Apache::lonhomework;
7: use strict;
8: use Apache::style;
9: use Apache::lonxml;
10: use Apache::lonnet;
11: use Apache::inputtags;
12: use Apache::structuretags;
13: use Apache::response;
14: use Apache::hint;
15: use Apache::outputtags;
16: use Apache::Constants qw(:common);
17:
18: sub get_target {
19: if ( $ENV{'request.state'} eq "published") {
20: if ( defined $ENV{'form.submitted'}) {
21: return ('grade', 'web');
22: } else {
23: return ('web');
24: }
25: } elsif ($ENV{'request.state'} eq "construct") {
26: if ( defined $ENV{'form.preview'}) {
27: if ( defined $ENV{'form.submitted'}) {
28: return ('grade', 'web');
29: } else {
30: return ('web');
31: }
32: } else {
33: return ('grade','web');
34: if ( $ENV{'form.submitted'} eq 'edit' ) {
35: return ('modified','edit');
36: } else {
37: return ('edit');
38: }
39: }
40: }
41: return ();
42: }
43:
44: sub setup_vars {
45: my ($target) = @_;
46: return ';'
47: # return ';$external::target='.$target.';';
48: }
49:
50: sub send_header {
51: my ($request)= @_;
52: $request->print(&Apache::lontexconvert::header());
53: $ENV{'request.uri'}=$request->uri;
54: # $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
55: }
56:
57: sub createmenu {
58: my ($which,$request)=@_;
59: if ($which eq 'grade') {
60: $request->print('<script language="JavaScript">
61: hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
62: "height=350,width=150,menubar=no");
63: </script>');
64: }
65: }
66:
67: sub send_footer {
68: my ($request)= @_;
69: # $request->print('</form>');
70: $request->print(&Apache::lontexconvert::footer());
71: }
72:
73: $Apache::lonxml::browse='';
74: sub check_date {
75: my ($id) = @_;
76: my $date ='';
77: my $status = '';
78: my $datemsg = '';
79: my $lastdate = '';
80: my $temp;
81: my $type;
82: my $passed;
83: &Apache::lonxml::debug("checking for part :$id:");
84: foreach $temp ("opendate","duedate","answerdate") {
85: $lastdate = $date;
86: $date = &Apache::lonnet::EXT("resource.$id.$temp");
87: &Apache::lonxml::debug("found :$date: for :$temp:");
88: if ($date eq '') {
89: $date = "an unknown date"; $passed = 0;
90: } elsif ($date eq 'con_lost') {
91: $date = "an indeterminate date"; $passed = 0;
92: } else {
93: if (time < $date) { $passed = 0; } else { $passed = 1; }
94: $date = localtime $date;
95: }
96: if (!$passed) { $type=$temp; last; }
97: }
98: &Apache::lonxml::debug("have :$type:$passed:");
99: if ($passed) {
100: $status='SHOW_ANSWER';
101: $datemsg=$date;
102: } elsif ($type eq 'opendate') {
103: $status='CLOSED';
104: $datemsg = "will open on $date";
105: } elsif ($type eq 'duedate') {
106: $status='CAN_ANSWER';
107: $datemsg = "is due at $date";
108: } elsif ($type eq 'answerdate') {
109: $status='CLOSED';
110: $datemsg = "was due on $lastdate, and answers will be available on $date";
111: }
112: if ($status eq 'CAN_ANSWER') {
113: #check #tries
114: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
115: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
116: if ( $tries eq '' ) { $tries = '0'; }
117: if ( $maxtries eq '' ) { $maxtries = '2'; }
118: if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
119: }
120: &Apache::lonxml::debug("sending back :$status:$datemsg:");
121: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
122: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
123: $status='CAN_ANSWER';
124: $datemsg='is closed but you are allowed to view it';
125: }
126: if ($ENV{'request.state'} eq "construct") {
127: &Apache::lonxml::debug("in construction ignoring dates");
128: $status='CAN_ANSWER';
129: $datemsg='is in under construction';
130: }
131: return ($status,$datemsg);
132: }
133:
134: sub showhash {
135: my (%hash) = @_;
136: my $resultkey;
137: foreach $resultkey (sort keys %hash) {
138: &Apache::lonxml::debug("$resultkey ---- $hash{$resultkey}");
139: }
140: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
141: return '';
142: }
143:
144: sub setuppermissions {
145: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
146: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
147: return ''
148: }
149:
150: sub setupheader {
151: my $request=$_[0];
152: if ($ENV{'browser.mathml'}) {
153: $request->content_type('text/xml');
154: } else {
155: $request->content_type('text/html');
156: }
157: $request->send_http_header;
158: return OK if $request->header_only;
159: &Apache::lonhomework::send_header($request);
160: return ''
161: }
162:
163: sub renderpage {
164: my ($request,$file) = @_;
165:
166: my (@targets) = &get_target();
167: foreach my $target (@targets) {
168: my $problem=&Apache::lonnet::getfile($file);
169: if ($problem == -1) {
170: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
171: $problem='';
172: }
173:
174: my %mystyle;
175: my $result = '';
176: &Apache::inputtags::initialize_inputtags;
177: %Apache::lonhomework::results=();
178: %Apache::lonhomework::history=&Apache::lonnet::restore();
179: #ignore error conditions
180: my ($temp)=keys %Apache::lonhomework::history ;
181: if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
182: if ($target eq 'web') {
183: if (&Apache::lonnet::symbread() eq '') {
184: if ($ENV{'request.state'} eq "construct") {
185: $request->print("In construction space, submissions ignored<br />");
186: } else {
187: $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored<br />");
188: }
189: }
190: if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }
191: }
192: if ($target eq 'grade') { &showhash(%Apache::lonhomework::history); }
193:
194: my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
195: if ($default == -1) {
196: &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");
197: $default='';
198: }
199: $result = &Apache::lonxml::xmlparse($target, $problem,
200: $default.&setup_vars($target),%mystyle);
201:
202: #$request->print("Result follows:");
203: if ($target eq 'modified') {
204: my $fileout = &Apache::lonnet::filelocation("",$request->uri);
205: my $filesave=$fileout.".bak";
206:
207: my $fs=Apache::File->new(">$filesave");
208: print $fs $problem;
209: $request->print("<b>Making Backup to $filesave</b><br />");
210:
211: my $fh=Apache::File->new(">$fileout");
212: print $fh $result;
213: $request->print("<b>Saving Modifications to $fileout</b><br />");
214: } else {
215: $request->print($result);
216: }
217: #$request->print(":Result ends");
218: if ($target eq 'grade') { &showhash(%Apache::lonhomework::results); }
219:
220: #store new values
221: my ($temp) = keys %Apache::lonhomework::results;
222: if ( $temp ne '' ) {
223: &Apache::lonxml::debug("Store return message:".
224: &Apache::lonnet::cstore(\%Apache::lonhomework::results));
225: }
226: }
227: }
228:
229: sub handler {
230: my $request=$_[0];
231:
232: if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}
233:
234: if (&setupheader($request)) { return OK; }
235:
236: #setup permissions
237: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
238: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
239: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
240:
241: my $file=&Apache::lonnet::filelocation("",$request->uri);
242:
243: #check if we know where we are
244: if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {
245: # if we are browsing we might not be able to know where we are
246: if ($Apache::lonhomework::browse ne 'F') {
247: #should know where we are, so ask
248: $request->internal_redirect('/adm/ambiguous'); return;
249: }
250: }
251:
252: if ($ENV{'request.state'} eq "construct") {
253: if ( -e $file ) {
254: if (!(defined $ENV{'form.showproblem'})) {
255: #first visit to problem in construction space
256: &view_or_edit_menu($request);
257: } else {
258: &renderpage($request,$file);
259: }
260: } else {
261: # requested file doesn't exist in contruction space
262: &newproblem($request);
263: }
264: } else {
265: # just render the page normally outside of construction space
266: &renderpage($request,$file);
267: }
268:
269: &Apache::lonhomework::send_footer($request);
270: # always turn off debug messages
271: $Apache::lonxml::debug=0;
272: return OK;
273:
274: }
275:
276: 1;
277: __END__
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