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: #use Time::HiRes qw( gettimeofday tv_interval );
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 $request->header_only;
172: return ''
173: }
174:
175: sub handle_save_or_undo {
176: my ($request,$problem,$result) = @_;
177: my $fileout = &Apache::lonnet::filelocation("",$request->uri);
178: my $filesave=$fileout.".bak";
179:
180: if ($ENV{'form.Undo'} eq 'undo') {
181: if (copy($filesave,$fileout)) {
182: $request->print("<b>Undid changes, Copied $filesave to $fileout<br /></b>");
183: } else {
184: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to undo, unable to copy $filesave to $fileout<br /></b></font>");
185: }
186: } else {
187: my $fs=Apache::File->new(">$filesave");
188: if (defined($fs)) {
189: print $fs $$problem;
190: $request->print("<b>Making Backup to $filesave</b><br />");
191: } else {
192: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filesave</b></font>");
193: }
194: my $fh=Apache::File->new(">$fileout");
195: if (defined($fh)) {
196: print $fh $$result;
197: $request->print("<b>Saving Modifications to $fileout</b><br />");
198: } else {
199: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $fileout</b></font>");
200: }
201: }
202: }
203:
204: sub renderpage {
205: my ($request,$file) = @_;
206:
207: my (@targets) = &get_target();
208: foreach my $target (@targets) {
209: #my $t0 = [&gettimeofday()];
210: my $problem=&Apache::lonnet::getfile($file);
211: if ($problem == -1) {
212: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
213: $problem='';
214: }
215:
216: my %mystyle;
217: my $result = '';
218: &Apache::inputtags::initialize_inputtags;
219: &Apache::edit::initialize_edit;
220: %Apache::lonhomework::results=();
221: %Apache::lonhomework::history=&Apache::lonnet::restore();
222: #ignore error conditions
223: my ($temp)=keys %Apache::lonhomework::history ;
224: if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
225: if ($target eq 'web') {
226: if (&Apache::lonnet::symbread() eq '') {
227: if ($ENV{'request.state'} eq "construct") {
228: $request->print("In construction space, submissions ignored<br />");
229: } else {
230: $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored<br />");
231: }
232: }
233: #if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }
234: }
235: if ($target eq 'grade') { &showhash(%Apache::lonhomework::history); }
236:
237: my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
238: if ($default == -1) {
239: &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");
240: $default='';
241: }
242: $result = &Apache::lonxml::xmlparse($target, $problem,
243: $default.&setup_vars($target),%mystyle);
244:
245: #$request->print("Result follows:");
246: if ($target eq 'modified') {
247: &handle_save_or_undo($request,\$problem,\$result);
248: } else {
249: #my $td=&tv_interval($t0);
250: #if ( $Apache::lonxml::debug) {
251: #$result =~ s:</body>::;
252: #$result.="<br />Spent $td seconds processing target $target\n</body>";
253: #}
254: $request->print($result);
255: }
256: #$request->print(":Result ends");
257: if ($target eq 'grade') { &showhash(%Apache::lonhomework::results); }
258:
259: #store new values
260: my ($temp) = keys %Apache::lonhomework::results;
261: if ( $temp ne '' ) {
262: &Apache::lonxml::debug("Store return message:".
263: &Apache::lonnet::cstore(\%Apache::lonhomework::results));
264: }
265: #my $td=&tv_interval($t0);
266: }
267: }
268:
269: # with no arg it returns a HTML <option> list of the template titles
270: # with one arg it returns the filename associated with the arg passed
271: sub get_template_list {
272: my ($namewanted,$extension) = @_;
273: my $result;
274: &Apache::lonxml::debug("Looking for :$extension:");
275: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
276: my $name=&Apache::lonnet::metadata($file,'title');
277: if ($namewanted && ($name eq $namewanted)) {
278: $result=$file;
279: last;
280: } else {
281: $result.="<option>$name</option>";
282: }
283: }
284: return $result;
285: }
286:
287: sub newproblem {
288: my ($request) = @_;
289:
290: if ($ENV{'form.template'}) {
291: use File::Copy;
292: my $extension=$request->uri;
293: $extension=~s:\.([\w]+)$:$1:;
294: my $file = &get_template_list($ENV{'form.template'},$extension);
295: my $dest = &Apache::lonnet::filelocation("",$request->uri);
296: copy($file,$dest);
297: &renderpage($request,$file);
298: } else {
299: my $templatelist=&get_template_list();
300: my $url=$request->uri;
301: my $dest = &Apache::lonnet::filelocation("",$request->uri);
302: $request->print(<<ENDNEWPROBLEM);
303: <body bgcolor="#FFFFFF">
304: The request file $url doesn\'t exist. You can create a new problem <br />
305: <form action="$url" method="POST">
306: <input type="submit" value="New Problem"><br />
307: <select name="template">
308: $templatelist
309: </select>
310: </form>
311: </body>
312: ENDNEWPROBLEM
313: }
314:
315: return '';
316: }
317:
318: sub view_or_edit_menu {
319: my ($request) = @_;
320: my $url=$request->uri;
321: $request->print(<<EDITMENU);
322: <body bgcolor="#FFFFFF">
323: <form action="$url" method="POST">
324: Would you like to <input type="submit" name="problemmode" value="View"> or
325: <input type="submit" name="problemmode" value="Edit"> the problem.
326: </form>
327: </body>
328: EDITMENU
329: }
330:
331: sub handler {
332: #my $t0 = [&gettimeofday()];
333: my $request=$_[0];
334:
335: if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}
336:
337: if (&setupheader($request)) { return OK; }
338: $ENV{'request.uri'}=$request->uri;
339:
340: #setup permissions
341: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
342: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
343: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
344:
345: my $file=&Apache::lonnet::filelocation("",$request->uri);
346:
347: #check if we know where we are
348: if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {
349: # if we are browsing we might not be able to know where we are
350: if ($Apache::lonhomework::browse ne 'F') {
351: #should know where we are, so ask
352: $request->internal_redirect('/adm/ambiguous'); return;
353: }
354: }
355:
356: if ($ENV{'request.state'} eq "construct") {
357: if ( -e $file ) {
358: if (!(defined $ENV{'form.problemmode'})) {
359: #first visit to problem in construction space
360: &view_or_edit_menu($request);
361: #&renderpage($request,$file);
362: } else {
363: &renderpage($request,$file);
364: }
365: } else {
366: # requested file doesn't exist in contruction space
367: &newproblem($request);
368: }
369: } else {
370: # just render the page normally outside of construction space
371: &renderpage($request,$file);
372: }
373: #my $td=&tv_interval($t0);
374: #&Apache::lonxml::debug("Spent $td seconds processing");
375: # &Apache::lonhomework::send_footer($request);
376: # always turn off debug messages
377: $Apache::lonxml::debug=0;
378: return OK;
379:
380: }
381:
382: 1;
383: __END__
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