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:
19: sub BEGIN {
20: &Apache::lonxml::register_insert();
21: }
22:
23: sub get_target {
24: if ( $ENV{'request.state'} eq "published") {
25: if ( defined $ENV{'form.submitted'}) {
26: return ('grade', 'web');
27: } else {
28: return ('web');
29: }
30: } elsif ($ENV{'request.state'} eq "construct") {
31: if ( defined $ENV{'form.preview'}) {
32: if ( defined $ENV{'form.submitted'}) {
33: return ('grade', 'web');
34: } else {
35: return ('web');
36: }
37: } else {
38: if ( $ENV{'form.problemmode'} eq 'View' ) {
39: if ( defined $ENV{'form.submitted'}) {
40: return ('grade', 'web');
41: } else {
42: return ('web');
43: }
44: } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
45: if ( $ENV{'form.submitted'} eq 'edit' ) {
46: return ('modified','edit');
47: } else {
48: return ('edit');
49: }
50: } else {
51: return ('web');
52: }
53: }
54: }
55: return ();
56: }
57:
58: sub setup_vars {
59: my ($target) = @_;
60: return ';'
61: # return ';$external::target='.$target.';';
62: }
63:
64: sub send_header {
65: my ($request)= @_;
66: $request->print(&Apache::lontexconvert::header());
67: # $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
68: }
69:
70: sub createmenu {
71: my ($which,$request)=@_;
72: if ($which eq 'grade') {
73: $request->print('<script language="JavaScript">
74: hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
75: "height=350,width=150,menubar=no");
76: </script>');
77: }
78: }
79:
80: sub send_footer {
81: my ($request)= @_;
82: # $request->print('</form>');
83: $request->print(&Apache::lontexconvert::footer());
84: }
85:
86: $Apache::lonxml::browse='';
87: sub check_date {
88: my ($id) = @_;
89: my $date ='';
90: my $status = '';
91: my $datemsg = '';
92: my $lastdate = '';
93: my $temp;
94: my $type;
95: my $passed;
96: &Apache::lonxml::debug("checking for part :$id:");
97: foreach $temp ("opendate","duedate","answerdate") {
98: $lastdate = $date;
99: $date = &Apache::lonnet::EXT("resource.$id.$temp");
100: &Apache::lonxml::debug("found :$date: for :$temp:");
101: if ($date eq '') {
102: $date = "an unknown date"; $passed = 0;
103: } elsif ($date eq 'con_lost') {
104: $date = "an indeterminate date"; $passed = 0;
105: } else {
106: if (time < $date) { $passed = 0; } else { $passed = 1; }
107: $date = localtime $date;
108: }
109: if (!$passed) { $type=$temp; last; }
110: }
111: &Apache::lonxml::debug("have :$type:$passed:");
112: if ($passed) {
113: $status='SHOW_ANSWER';
114: $datemsg=$date;
115: } elsif ($type eq 'opendate') {
116: $status='CLOSED';
117: $datemsg = "will open on $date";
118: } elsif ($type eq 'duedate') {
119: $status='CAN_ANSWER';
120: $datemsg = "is due at $date";
121: } elsif ($type eq 'answerdate') {
122: $status='CLOSED';
123: $datemsg = "was due on $lastdate, and answers will be available on $date";
124: }
125: if ($status eq 'CAN_ANSWER') {
126: #check #tries
127: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
128: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
129: if ( $tries eq '' ) { $tries = '0'; }
130: if ( $maxtries eq '' ) { $maxtries = '2'; }
131: if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
132: }
133: &Apache::lonxml::debug("sending back :$status:$datemsg:");
134: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
135: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
136: $status='CAN_ANSWER';
137: $datemsg='is closed but you are allowed to view it';
138: }
139: if ($ENV{'request.state'} eq "construct") {
140: &Apache::lonxml::debug("in construction ignoring dates");
141: $status='CAN_ANSWER';
142: $datemsg='is in under construction';
143: }
144: return ($status,$datemsg);
145: }
146:
147: sub showhash {
148: my (%hash) = @_;
149: my $resultkey;
150: foreach $resultkey (sort keys %hash) {
151: &Apache::lonxml::debug("$resultkey ---- $hash{$resultkey}");
152: }
153: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
154: return '';
155: }
156:
157: sub setuppermissions {
158: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
159: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
160: return ''
161: }
162:
163: sub setupheader {
164: my $request=$_[0];
165: if ($ENV{'browser.mathml'}) {
166: $request->content_type('text/xml');
167: } else {
168: $request->content_type('text/html');
169: }
170: $request->send_http_header;
171: return OK if $request->header_only;
172: return ''
173: }
174:
175: sub renderpage {
176: my ($request,$file) = @_;
177:
178: my (@targets) = &get_target();
179: foreach my $target (@targets) {
180: my $problem=&Apache::lonnet::getfile($file);
181: if ($problem == -1) {
182: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
183: $problem='';
184: }
185:
186: my %mystyle;
187: my $result = '';
188: &Apache::inputtags::initialize_inputtags;
189: %Apache::lonhomework::results=();
190: %Apache::lonhomework::history=&Apache::lonnet::restore();
191: #ignore error conditions
192: my ($temp)=keys %Apache::lonhomework::history ;
193: if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
194: if ($target eq 'web') {
195: if (&Apache::lonnet::symbread() eq '') {
196: if ($ENV{'request.state'} eq "construct") {
197: $request->print("In construction space, submissions ignored<br />");
198: } else {
199: $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored<br />");
200: }
201: }
202: #if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }
203: }
204: if ($target eq 'grade') { &showhash(%Apache::lonhomework::history); }
205:
206: my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
207: if ($default == -1) {
208: &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");
209: $default='';
210: }
211: $result = &Apache::lonxml::xmlparse($target, $problem,
212: $default.&setup_vars($target),%mystyle);
213:
214: #$request->print("Result follows:");
215: if ($target eq 'modified') {
216: my $fileout = &Apache::lonnet::filelocation("",$request->uri);
217: my $filesave=$fileout.".bak";
218:
219: my $fs=Apache::File->new(">$filesave");
220: print $fs $problem;
221: $request->print("<b>Making Backup to $filesave</b><br />");
222:
223: my $fh=Apache::File->new(">$fileout");
224: print $fh $result;
225: $request->print("<b>Saving Modifications to $fileout</b><br />");
226: } else {
227: $request->print($result);
228: }
229: #$request->print(":Result ends");
230: if ($target eq 'grade') { &showhash(%Apache::lonhomework::results); }
231:
232: #store new values
233: my ($temp) = keys %Apache::lonhomework::results;
234: if ( $temp ne '' ) {
235: &Apache::lonxml::debug("Store return message:".
236: &Apache::lonnet::cstore(\%Apache::lonhomework::results));
237: }
238: }
239: }
240:
241: # with no arg it returns a HTML <option> list of the template titles
242: # with one arg it returns the filename associated with the arg passed
243: sub get_template_list {
244: my ($namewanted) = @_;
245: my $result;
246: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.problem>) {
247: my $name=&Apache::lonnet::metadata($file,'title');
248: if ($namewanted && ($name eq $namewanted)) {
249: $result=$file;
250: last;
251: } else {
252: $result.="<option>$name</option>";
253: }
254: }
255: return $result;
256: }
257:
258: sub newproblem {
259: my ($request) = @_;
260:
261: if ($ENV{'form.template'}) {
262: use File::Copy;
263: my $file = &get_template_list($ENV{'form.template'});
264: my $dest = &Apache::lonnet::filelocation("",$request->uri);
265: copy($file,$dest);
266: &renderpage($request,$file);
267: } else {
268: my $templatelist=&get_template_list();
269: my $url=$request->uri;
270: $request->print(<<ENDNEWPROBLEM);
271: <body bgcolor="#FFFFFF">
272: The request file $url doesn\'t exist. You can create a new problem <br />
273: <form action="$url" method="POST">
274: <input type="submit" value="New Problem"><br />
275: <select name="template">
276: $templatelist
277: </select>
278: </form>
279: </body>
280: ENDNEWPROBLEM
281: }
282:
283: return '';
284: }
285:
286: sub view_or_edit_menu {
287: my ($request) = @_;
288: my $url=$request->uri;
289: $request->print(<<EDITMENU);
290: <body bgcolor="#FFFFFF">
291: <form action="$url" method="POST">
292: Would you like to <input type="submit" name="problemmode" value="View"> or
293: <input type="submit" name="problemmode" value="Edit"> the problem.
294: </form>
295: </body>
296: EDITMENU
297: }
298:
299: sub handler {
300: my $request=$_[0];
301:
302: #if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}
303:
304: if (&setupheader($request)) { return OK; }
305: $ENV{'request.uri'}=$request->uri;
306:
307: #setup permissions
308: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
309: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
310: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
311:
312: my $file=&Apache::lonnet::filelocation("",$request->uri);
313:
314: #check if we know where we are
315: if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {
316: # if we are browsing we might not be able to know where we are
317: if ($Apache::lonhomework::browse ne 'F') {
318: #should know where we are, so ask
319: $request->internal_redirect('/adm/ambiguous'); return;
320: }
321: }
322:
323: if ($ENV{'request.state'} eq "construct") {
324: if ( -e $file ) {
325: if (!(defined $ENV{'form.problemmode'})) {
326: #first visit to problem in construction space
327: &view_or_edit_menu($request);
328: #&renderpage($request,$file);
329: } else {
330: &renderpage($request,$file);
331: }
332: } else {
333: # requested file doesn't exist in contruction space
334: &newproblem($request);
335: }
336: } else {
337: # just render the page normally outside of construction space
338: &renderpage($request,$file);
339: }
340:
341: &Apache::lonhomework::send_footer($request);
342: # always turn off debug messages
343: $Apache::lonxml::debug=0;
344: return OK;
345:
346: }
347:
348: 1;
349: __END__
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