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