1: # The LearningOnline Network with CAPA
2: # PDF Form Upload Handler
3: #
4: # $Id: lonpdfupload.pm,v 1.12 2009/05/25 12:54:18 bisitz Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: package Apache::lonpdfupload;
29:
30: use lib '/home/httpd/lib/perl';
31: use Apache::Constants qw(:common :http);
32: use LONCAPA;
33: use LONCAPA::loncgi;
34: use File::Path;
35: use File::Basename;
36: use File::Copy;
37: use IO::File;
38: use Image::Magick;
39: use Apache::lonacc;
40: use Apache::lonxml;
41: use Apache::lonhtmlcommon();
42: use Apache::lonnet;
43: use Apache::loncommon();
44: use Apache::lonlocal;
45: use Apache::lonmsg();
46: use Apache::lonhomework;
47: use LONCAPA::Enrollment;
48: use LONCAPA::Configuration;
49: use CAM::PDF;
50:
51: use strict;
52:
53: sub handler() {
54: my $r = shift;
55:
56: # check user permissions
57: if(!&checkpermission($r)) {
58: # stop processing
59: return OK;
60: }
61:
62: $Apache::lonxml::request=$r;
63: $Apache::lonxml::debug=$env{'user.debug'};
64:
65: $env{'request.uri'}=$r->uri;
66: $r->content_type('text/html');
67: $r->send_http_header();
68: $r->print(&Apache::loncommon::start_page('Upload PDF Form'));
69:
70: #load post data into environment
71: &Apache::lonacc::get_posted_cgi($r);
72:
73: # if a file was upload
74: if($env{'form.Uploaded'} && $env{'form.file'}) {
75: $r->print(&processPDF);
76: } else {
77: # print upload form
78: $r->print(&get_javascripts);
79: $r->print(&get_uploadform);
80: }
81:
82: #link to course-content
83: $r->print('<hr />'
84: .'<p>'."\n"
85: .'<a href="/adm/navmaps">'."\n"
86: .&mt("Navigate Contents")."\n"
87: .'</a>'."\n"
88: .'</p>'."\n"
89: );
90:
91: #&dumpenv($r); #debug -> prints the environment
92: $r->print(&Apache::loncommon::end_page());
93: return OK;
94: }
95:
96:
97: sub checkpermission() {
98: my $r = shift;
99: if (! &LONCAPA::loncgi::check_cookie_and_load_env()) {
100: my $result = <<END
101: Content-type: text/html
102:
103: <html>
104: <head>
105: <title>
106: Bad Cookie
107: </title>
108: </head>
109: <body>
110: Your cookie information is incorrect.
111: </body>
112: </html>
113: END
114: ;
115: $r->print($result);
116: return 0;
117: } else {
118: return 1;
119: }
120: }
121:
122:
123: sub get_javascripts() {
124:
125: my $message = &mt('Please choose a PDF-File.');
126:
127: # simple test if the upload ends with ".pdf"
128: # it's only for giving a message to the user
129: my $result .= <<END
130: <script type="text/javascript">
131: function checkFilename(form) {
132: var fileExt = form.file.value;
133: fileExt = fileExt.match(/[.]pdf\$/g);
134: if(fileExt) {
135: return true;
136: }
137: alert("$message");
138: return false;
139: }
140: </script>
141: END
142: ;
143: return $result;
144: }
145:
146:
147: sub get_uploadform() {
148:
149: my %lt = &Apache::lonlocal::texthash(
150: 'title' => 'Upload a PDF Form with filled Form Fields',
151: 'chFile' => 'File',
152: 'submit' => 'Upload',
153: );
154:
155: my $result =
156: '<br />'
157: .'<form method="post" enctype="multipart/form-data" onsubmit="return checkFilename(this);">'
158: .'<input type="hidden" name="type" value="upload" />'
159: .&Apache::lonhtmlcommon::start_pick_box()
160: .&Apache::lonhtmlcommon::row_headline()
161: .'<h2>'.$lt{'title'}.'</h2>'
162: .&Apache::lonhtmlcommon::row_closure()
163: .&Apache::lonhtmlcommon::row_title($lt{'chFile'})
164: .'<input type="file" name="file" id="filename" />'
165: .&Apache::lonhtmlcommon::row_closure(1)
166: .&Apache::lonhtmlcommon::end_pick_box()
167: .'<input type="submit" name="Uploaded" value="'.$lt{'submit'}.'" />'
168: .'</form>'
169: .'<br />';
170:
171: return $result;
172: }
173:
174: sub processPDF {
175: my $result = (); # message for Browser
176: my @pdfdata = (); # answers from PDF-Forms
177:
178: @pdfdata = &get_pdf_data(); # get answers from PDF-Form
179:
180: if (scalar @pdfdata) {
181: &grade_pdf(@pdfdata);
182: } else {
183: $result .= '<p class="LC_error">'
184: .&mt("Can't find any valid PDF formfields.")
185: .'</p>';
186: }
187: }
188:
189: sub get_pdf_data() {
190: my @data = ();
191: my $pdf = CAM::PDF->new($env{'form.file'});
192:
193: my @formFields = $pdf->getFormFieldList(); #get names of formfields
194:
195: foreach my $field (@formFields) {
196: my $dict = $pdf->getFormFieldDict($pdf->getFormField($field)); # get formfield dictonary
197:
198: #
199: # this is nessesary 'cause CAM::PDF has a problem with formfieldnames which include a
200: # dot in fieldnames. So a fieldname like "i.am.aFormfield" will offer three fieldnames "i", "i.am"
201: # and "i.am.aFormfield". The fragmentary names keep no values and will be ignored.
202: if($dict->{'V'}) {
203: push(@data, $field."?". $dict->{'V'}{'value'}); #binding fieldname with value
204: }
205: }
206: return @data;
207: }
208:
209: sub grade_pdf {
210: my $result = ();
211: my @pdfdata = @_;
212:
213: my $meta = ();
214: my %grades = ();
215: my %problems = ();
216:
217: my $debug = ();
218:
219: $debug .= "Found: ". scalar @pdfdata." Entries \n";
220:
221: foreach my $entry (sort(@pdfdata)) {
222: if ($entry =~ /^meta.*/) {
223: $debug .= 'found: metadata -> '.$entry . "<br />";
224: my ($label, $value) = ($entry =~ /^([^?]*)\?(.*)/);
225: my ($domain, $user) = split('&', $value);
226: $user =~ s/(.*)\n/$1/; #TODO is that equals to chomp?
227:
228: if($user ne $env{'user.name'} or $domain ne $env{'user.domain'}) {
229: return '<p class="LC_error">'
230: .&mt('Wrong username ([_1]) found in PDF file. Expected username: [_2]'
231: ,$user.':'.$domain
232: ,$env{'user.domain'}.':'.$env{'user.name'})
233: .'</p>';
234: }
235:
236: } elsif($entry =~ /^upload.*/) {
237: $debug .= 'found: a problem -> '.$entry;
238: my ($label, $value) = ($entry =~ /^([^?]*)\?(.*)/);
239: my ($symb, $part, $type, $HWVAL) = split('&', $label);
240: my ($map,$id,$resource)=&Apache::lonnet::decode_symb($symb);
241: $value =~ s/(.*)\n/$1/;
242:
243: #filter incorrect radiobuttons (Bug in CABAReT Stage)
244: if($type eq 'radiobuttonresponse' && $value eq 'Off' ) {
245: next;
246: }
247:
248: my $submit = $part;
249: $submit =~ s/part_(.*)/submit_$1/;
250: if($problems{$symb.$part}) {
251: $problems{$symb.$part}{$HWVAL} = $value;
252: } else {
253: $problems{$symb.$part} = { 'resource' => $resource,
254: 'symb' => $symb,
255: 'submitted' => $part,
256: $submit => 'Answer',
257: $HWVAL => $value};
258: }
259: } else {
260: $debug .= 'found: -> '.$entry;
261: next;
262: }
263: }
264: #$result .= $debug;
265:
266: $result .= '<h2>'.&mt('Results of PDF Form problems').'</h2>';
267: $result .= &Apache::loncommon::start_data_table()
268: .&Apache::loncommon::start_data_table_header_row()
269: .'<th>'.&mt('Problem Name').'</th>'
270: .'<th>'.&mt('Grading').'</th>'
271: .&Apache::loncommon::start_data_table_header_row()
272: .&Apache::loncommon::end_data_table_header_row();
273:
274: foreach my $key (sort (keys %problems)) {
275: my %problem = %{$problems{$key}};
276: my ($problemname, $grade) = &grade_problem(%problem);
277:
278: $result .= &Apache::loncommon::start_data_table_row();
279: $result .= "<td>$problemname</td><td class='";
280: if($grade eq "EXACT_ANS" || $grade eq "APPROX_ANS") {
281: $result .= "LC_answer_correct";
282: } else {
283: $result .= "LC_answer_charged_try";
284: }
285: $grade = &parse_grade_answer($grade);
286: $result .= "'>$grade</span></td>";
287: $result .= &Apache::loncommon::end_data_table_row();
288: }
289: $result .= &Apache::loncommon::end_data_table();
290:
291:
292: return $result;
293: }
294:
295: sub grade_problem {
296: my %problem = @_;
297: my ($title, $part) = ();
298:
299: &Apache::loncommon::ssi_with_retries('/res/'.$problem{'resource'}, 5, %problem);
300:
301: $title = &Apache::lonnet::gettitle($problem{'symb'});
302: $part = $problem{submitted};
303: $part =~ s/part_(.*)/$1/;
304: unless($part eq '0') {
305: #add information about part number
306: $title .= " - Part $part";
307: }
308:
309: my %problemhash = &Apache::lonnet::restore($problem{'symb'});
310: my $grade = $problemhash{"resource.$part.award"};
311:
312: return ($title, $grade);
313: }
314:
315: sub parse_grade_answer {
316: my ($shortcut) = @_;
317: my %answerhash = ('EXACT_ANS' => &mt('You are correct.'),
318: 'APPROX_ANS' => &mt('You are correct.'),
319: 'INCORRECT' => &mt('You are incorrect'),
320: );
321:
322: foreach my $key (keys %answerhash) {
323: if($shortcut eq $key) {
324: return $answerhash{$shortcut};
325: }
326: }
327: return &mt('See course contents for further information.');
328:
329: }
330:
331:
332: sub dumpenv {
333: my $r = shift;
334:
335: $r->print ("<br />-------------------<br />");
336: foreach my $key (sort (keys %env)) {
337: $r->print ("<br />$key -> $env{$key}");
338: }
339: $r->print ("<br />-------------------<br />");
340: $r->print ("<br />-------------------<br />");
341: foreach my $key (sort (keys %ENV)) {
342: $r->print ("<br />$key -> $ENV{$key}");
343: }
344: $r->print ("<br />-------------------<br />");
345:
346: }
347:
348: 1;
349: __END__
350:
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