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