1: # The LON-CAPA Homework handler
2: # Guy Albertelli
3:
4: package Apache::lonhomework;
5: use strict;
6: use Apache::style;
7: use Apache::lonxml;
8: use Apache::lonnet;
9: use Apache::inputtags;
10: use Apache::structuretags;
11: use Apache::response;
12:
13:
14: sub handler {
15: my $request=shift;
16:
17: my $target=&get_target();
18: $Apache::lonxml::debug=1;
19: if ($ENV{'browser.mathml'}) {
20: $request->content_type('text/xml');
21: } else {
22: $request->content_type('text/html');
23: }
24: $request->send_http_header;
25: return 'OK' if $request->header_only;
26:
27: &Apache::lonhomework::send_header($request);
28: my $file = &Apache::lonnet::filelocation("",$request->uri);
29: my %mystyle;
30: my $result = '';
31: &Apache::inputtags::initialize_inputtags;
32: %Apache::lonhomework::results=();
33: %Apache::lonhomework::history=&Apache::lonnet::restore;
34: #ignore error conditions
35: my ($temp)=keys %Apache::lonhomework::history ;
36: if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
37:
38: my $resultkey;
39: foreach $resultkey (sort keys %Apache::lonhomework::history) {
40: &Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::history{$resultkey}");
41: }
42: &Apache::lonxml::debug("\n<br>restored values^</br>\n");
43:
44: my $problem=&Apache::lonnet::getfile($file);
45: if ($problem == -1) {
46: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
47: $problem='';
48: }
49: my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
50: if ($default == -1) {
51: &Apache::lonxml::error("<b>Unable to find <i>$file</i></b>");
52: $default='';
53: }
54:
55: $result = Apache::lonxml::xmlparse($target, $problem,
56: $default.&setup_vars($target),%mystyle);
57: #$request->print("Result follows:");
58: $request->print($result);
59: #$request->print(":Result ends");
60:
61: foreach $resultkey (sort keys %Apache::lonhomework::results) {
62: &Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::results{$resultkey}");
63: }
64: &Apache::lonxml::debug("\n<br>storing values^</br>\n");
65:
66: &Apache::lonhomework::send_footer($request);
67: ($temp) = keys %Apache::lonhomework::results;
68: if ( $temp ne '' ) {
69: &Apache::lonxml::debug("Store return message:".&Apache::lonnet::cstore(%Apache::lonhomework::results));
70: }
71: return 'OK';
72: }
73:
74: sub get_target {
75: if ( $ENV{'request.state'} eq "published") {
76: return 'web';
77: } elsif ($ENV{'request.state'} eq "construct") {
78: if ( defined $ENV{'form.preview'}) {
79: return 'web';
80: } else {
81: return 'edit';
82: }
83: }
84: }
85:
86: sub setup_vars {
87: my ($target) = @_;
88: return ';'
89: # return ';$external::target='.$target.';';
90: }
91:
92: sub send_header {
93: my ($request)= @_;
94: $request->print(&Apache::lontexconvert::header());
95: $ENV{'request.uri'}=$request->uri;
96: # $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
97: }
98:
99: sub send_footer {
100: my ($request)= @_;
101: # $request->print('</form>');
102: $request->print(&Apache::lontexconvert::footer());
103: }
104:
105: sub getfilenothere {
106: my ($filename) = @_;
107: my $a="";
108: if (! -e $filename ) {
109: &Apache::lonnet::subscribe($filename);
110: &Apache::lonnet::repcopy($filename);
111: }
112: {
113: my $fh=Apache::File->new($filename);
114:
115: while (<$fh>) {
116: $a .=$_;
117: }
118: }
119: return $a
120: }
121:
122: 1;
123: __END__
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