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File:  [LON-CAPA] / loncom / interface / lonpdfupload.pm
Revision 1.6: download - view: text, annotated - select for diffs
Sat May 16 00:28:38 2009 UTC (15 years, 11 months ago) by bisitz
Branches: MAIN
CVS tags: HEAD
Optimized screen layout, wording and localization:
- Wording
- Optimized mt usage
- Added new phrases to de.pm
- Always separate Navigate link from rest of screen by <hr>
- Make headlines headlines
- Added error style to error message
- Corrected grading table header and added table headline

# The LearningOnline Network with CAPA
# Publication Handler
#
# $Id: lonpdfupload.pm,v 1.6 2009/05/16 00:28:38 bisitz Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
package Apache::lonpdfupload;

use lib '/home/httpd/lib/perl';
use Apache::Constants qw(:common :http);
use LONCAPA;
use LONCAPA::loncgi;
use File::Path;
use File::Basename;
use File::Copy;
use IO::File;
use Image::Magick;
use Apache::lonacc;
use Apache::lonxml;
use Apache::lonhtmlcommon();
use Apache::lonnet;
use Apache::loncommon();
use Apache::lonlocal;
use Apache::lonmsg();
use Apache::lonhomework;
use LONCAPA::Enrollment;
use LONCAPA::Configuration;
use CAM::PDF;

use strict;

sub handler() {
    my $r = shift;

    # check user permissions 
    if(!&checkpermission($r)) {
        # stop processing 
        return OK;
    }

    $Apache::lonxml::request=$r;
    $Apache::lonxml::debug=$env{'user.debug'};

    $env{'request.uri'}=$r->uri;
    $r->content_type('text/html');
    $r->send_http_header();
    $r->print(&Apache::loncommon::start_page('Upload PDF Form'));

    #load post data into environment
    &Apache::lonacc::get_posted_cgi($r);

    # if a file was upload
    if($env{'form.Uploaded'} && $env{'form.file'}) {
        $r->print(&processPDF);
    } else { 
        # print upload form
        $r->print(&get_javascripts);
        $r->print(&get_uploadform);
    }

    #link to course-content
    $r->print('<hr />'
             .'<p>'."\n"
             .'<a href="/adm/navmaps">'."\n"
             .&mt("Navigate Contents")."\n"
             .'</a>'."\n"
             .'</p>'."\n"
    );

    #&dumpenv($r); #debug -> prints the environment
    $r->print("  </body> \n</html>\n");
    return OK;
}


sub checkpermission() {
    my $r = shift;
    if (! &LONCAPA::loncgi::check_cookie_and_load_env()) {
        my $result  = <<END
Content-type: text/html

<html>
  <head>
    <title>
      Bad Cookie
    </title>
  </head>
  <body>
    Your cookie information is incorrect.
  </body>
</html>
END
;
        $r->print($result);
        return 0;
    } else {
        return 1;
    }
}


sub get_javascripts() {
    
    my $message = &mt('Please choose a PDF-File.');

    # simple test if the upload ends with ".pdf"
    # it's only for giving a message to the user
    my $result .= <<END
  <script type="text/javascript">
    function checkFilename(form) {
        var fileExt = form.file.value;
        fileExt = fileExt.match(/[.]pdf\$/g);
        if(fileExt) {
            return true;
        }
        alert("$message");
        return false;
    }
  </script>
END
;
    return $result; 
}


sub get_uploadform() {
    
    my %lt = &Apache::lonlocal::texthash(
                 'title'  => 'Upload a PDF Form with filled Form Fields', 
                 'chFile' => 'File',
                 'submit' => 'Upload',
             );

    my $result = 
        '<br />'
       .'<form method="post" enctype="multipart/form-data" onsubmit="return checkFilename(this);">'
       .'<input type="hidden" name="type" value="upload" />'
       .&Apache::lonhtmlcommon::start_pick_box()
       .&Apache::lonhtmlcommon::row_headline()
       .'<h2>'.$lt{'title'}.'</h2>'
       .&Apache::lonhtmlcommon::row_closure()
       .&Apache::lonhtmlcommon::row_title($lt{'chFile'})
       .'<input type="file" name="file" id="filename" />'
       .&Apache::lonhtmlcommon::row_closure(1)
       .&Apache::lonhtmlcommon::end_pick_box()
       .'<input type="submit" name="Uploaded" value="'.$lt{'submit'}.'" />'
       .'</form>'
       .'<br />';

  return $result;
}

sub processPDF {
    my $result = ();  # message for Browser
    my @pdfdata = (); # answers from PDF-Forms
    
    @pdfdata = &get_pdf_data(); # get answers from PDF-Form
    
    if (scalar @pdfdata) {    
        &grade_pdf(@pdfdata);
    } else {
        $result .= '<p class="LC_error">'
                  .&mt("Can't find any valid PDF formfields.")
                  .'</p>';
    }
}

sub get_pdf_data() {
    my @data = ();
    my $pdf = CAM::PDF->new($env{'form.file'});

    my @formFields = $pdf->getFormFieldList(); #get names of formfields
    
    foreach my $field (@formFields) {
	my $dict = $pdf->getFormFieldDict($pdf->getFormField($field)); # get formfield dictonary

        #
        # this is nessesary 'cause CAM::PDF has a problem with formfieldnames which include a
        # dot in fieldnames. So a fieldname like "i.am.aFormfield" will offer three fieldnames "i", "i.am" 
        # and "i.am.aFormfield". The fragmentary names keep no values and will be ignored.
        if($dict->{'V'}) {
            push(@data, $field."?". $dict->{'V'}{'value'}); #binding fieldname with value
        }
    } 
    return @data;
}

sub grade_pdf {
    my $result = ();
    my @pdfdata = @_;
   
    my $meta = ();
    my %grades = ();
    my %problems = ();
        
    my $debug = ();

    $debug  .= "Found: ". scalar @pdfdata." Entries \n";
    $result .= '<h2>'.&mt('Results of PDF Form problems').'</h2>';
    $result .= &Apache::loncommon::start_data_table()
              .&Apache::loncommon::start_data_table_header_row()
              .'<th>'.&mt('Problem Name').'</th>'
              .'<th>'.&mt('Grading').'</th>'
              .&Apache::loncommon::start_data_table_header_row()
              .&Apache::loncommon::end_data_table_header_row();

    foreach my $entry (sort(@pdfdata)) {
        if ($entry =~ /^meta.*/) {
            $debug .= 'found: metadata -> '.$entry . "<br />";
            my ($label, $value) = ($entry =~ /^([^?]*)\?(.*)/);
            my ($domain, $user) = split('&', $value);
            $user =~ s/(.*)\n/$1/; #TODO is that equals to chomp?
            
            if($user ne $env{'user.name'} or  $domain ne $env{'user.domain'}) {
                return "<pre>".&mt('Wrong username in PDF-File').": $user $domain -> $env{'user.domain'} $env{'user.name'} </pre>";    
            }

        } elsif($entry =~ /^upload.*/)  {
            $debug .= 'found: a problem -> '.$entry;
            my ($label, $value) = ($entry =~ /^([^?]*)\?(.*)/);
            my ($symb, $part, $type, $HWVAL) = split('&', $label);
            my ($map,$id,$resource)=&Apache::lonnet::decode_symb($symb);  
            $value =~ s/(.*)\n/$1/; 

            #filter incorrect radiobuttons (Bug in CABAReT Stage)
            if($type eq 'radiobuttonresponse' && $value eq 'Off' ) {
                next;
            }
 
            my $submit = $part;
            $submit =~ s/part_(.*)/submit_$1/;
            if($problems{$symb.$part}) {
                 $problems{$symb.$part}{$HWVAL} = $value;
            } else {
                 $problems{$symb.$part} =  { 'resource' => $resource,
                                        'symb' => &Apache::lonenc::encrypted($symb),
                                        'submitted' => $part,
                                        $submit => 'Answer',
                                        $HWVAL => $value};
            }
        } else {
            $debug .= 'found: -> '.$entry;
            next;
        }
    }
    #$result .= $debug;

    foreach my $key (sort (keys %problems)) {
        my %problem = %{$problems{$key}};
        my ($problemname, $grade) = &grade_problem(%problem);

        $problemname =~ s/(.*)\s*-\sPart\s0/$1/; #cut part when there is only one part in problem

        $result .= &Apache::loncommon::start_data_table_row();
        $result .= "<td>$problemname</td><td class='";
        if($grade eq "EXACT_ANS") {
            $result .= "LC_answer_correct";
        } else { 
            $result .= "LC_answer_charged_try";
        }
        $result .= "'>$grade</span></td>";
        $result .= &Apache::loncommon::end_data_table_row();
    }
    $result .= &Apache::loncommon::end_data_table();


    return $result;        
}

sub grade_problem {
    my %problem = @_;

    my ($content) =  &Apache::loncommon::ssi_with_retries('/res/'.
            $problem{'resource'}, 5, %problem);
    
    #TODO ? filter html response can't be the answer 
    #     ! find an other way to get a problemname and Part
    $content =~ s/.*class="LC_current_location".*>(.*)<\/td>.*/$1/g;
    $content = $1;

    my $part = $problem{submitted};
    $part =~ s/part_(.*)/$1/;
    $content .= " - Part $part";
 
    my %problemhash = &Apache::lonnet::restore($problem{'symb'});
    my $grade = $problemhash{"resource.$part.award"};

    return ($content, $grade);    
}

sub dumpenv  {
    my $r = shift;

    $r->print ("<br />-------------------<br />");
    foreach my $key (sort (keys %env)) {
        $r->print ("<br />$key -> $env{$key}");
    }
    $r->print ("<br />-------------------<br />");
    $r->print ("<br />-------------------<br />");
    foreach my $key (sort (keys %ENV)) {
        $r->print ("<br />$key -> $ENV{$key}");
    }
    $r->print ("<br />-------------------<br />");
    
}	

1;
__END__
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