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Sat Mar 2 03:50:27 2002 UTC (22 years, 3 months ago) by harris41
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CVS tags: HEAD
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# The LearningOnline Network
# Feedback
#
# $Id: lonfeedback.pm,v 1.24 2002/03/02 03:50:27 harris41 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/
#
# (Internal Server Error Handler
#
# (Login Screen
# 5/21/99,5/22,5/25,5/26,5/31,6/2,6/10,7/12,7/14,
# 1/14/00,5/29,5/30,6/1,6/29,7/1,11/9 Gerd Kortemeyer)
#
# 3/1/1 Gerd Kortemeyer)
#
# 3/1,2/3,2/5,2/6,2/8 Gerd Kortemeyer
# 2/9 Guy Albertelli
# 2/10 Gerd Kortemeyer
# 2/13 Guy Albertelli
# 7/25 Gerd Kortemeyer
# 7/26 Guy Albertelli
# 7/26,8/10,10/1,11/5,11/6,12/27,12/29 Gerd Kortemeyer
# YEAR=2002
# 1/1,1/16 Gerd Kortemeyer
#

package Apache::lonfeedback;

use strict;
use Apache::Constants qw(:common);
use Apache::lonmsg();
use Apache::loncommon();

sub mail_screen {
  my ($r,$feedurl,$options) = @_;
  $r->print(<<ENDDOCUMENT);
<html>
<head>
<title>The LearningOnline Network with CAPA</title>
<meta http-equiv="pragma" content="no-cache"></meta>
<script>
    function gosubmit() {
        var rec=0;
        if (typeof(document.mailform.elements.author)!="undefined") {
          if (document.mailform.elements.author.checked) {
             rec=1;
          } 
        }
        if (typeof(document.mailform.elements.question)!="undefined") {
          if (document.mailform.elements.question.checked) {
             rec=1;
          } 
        }
        if (typeof(document.mailform.elements.course)!="undefined") {
          if (document.mailform.elements.course.checked) {
             rec=1;
          } 
        }
        if (typeof(document.mailform.elements.policy)!="undefined") {
          if (document.mailform.elements.policy.checked) {
             rec=1;
          } 
        }
        if (typeof(document.mailform.elements.discuss)!="undefined") {
          if (document.mailform.elements.discuss.checked) {
             rec=1;
          } 
        }
        if (typeof(document.mailform.elements.anondiscuss)!="undefined") {
          if (document.mailform.elements.anondiscuss.checked) {
             rec=1;
          } 
        }

        if (rec) {
	    document.mailform.submit();
        } else {
            alert('Please check a feedback type.');
	}
    }
</script>
</head>
<body bgcolor="#FFFFFF" onLoad="window.focus();">
<img align=right src=/adm/lonIcons/lonlogos.gif>
<h1>Feedback</h1>
<h2><tt>$feedurl</tt></h2>
<form action="/adm/feedback" method=post name=mailform>
<input type=hidden name=postdata value="$feedurl">
Please check at least one of the following feedback types:
$options<hr>
My question/comment/feedback:<p>
<textarea name=comment cols=60 rows=10 wrap=hard>
</textarea><p>
<input type=hidden name=sendit value=1>
<input type=button value="Send Feedback" onClick='gosubmit();'></input>
</form>
</body>
</html>
ENDDOCUMENT
}

sub fail_redirect {
  my ($r,$feedurl) = @_;
  $r->print (<<ENDFAILREDIR);
<head><title>Feedback not sent</title>
<meta http-equiv="pragma" content="no-cache"></meta>
<meta HTTP-EQUIV="Refresh" CONTENT="2; url=$feedurl">
</head>
<html>
<body bgcolor="#FFFFFF">
<img align=right src=/adm/lonIcons/lonlogos.gif>
<b>Sorry, no recipients  ...</b>
</body>
</html>
ENDFAILREDIR
}

sub redirect_back {
  my ($r,$feedurl,$typestyle,$sendsomething,$status) = @_;
  $r->print (<<ENDREDIR);
<head>
<title>Feedback sent</title>
<meta http-equiv="pragma" content="no-cache"></meta>
<meta HTTP-EQUIV="Refresh" CONTENT="2; url=$feedurl">
</head>
<html>
<body bgcolor="#FFFFFF">
<img align=right src=/adm/lonIcons/lonlogos.gif>
$typestyle
<b>Sent $sendsomething message(s).</b>
<font color=red>$status</font>
</body>
</html>
ENDREDIR
}

sub no_redirect_back {
  my ($r,$feedurl) = @_;
  $r->print (<<ENDNOREDIR);
<head><title>Feedback not sent</title>
<meta http-equiv="pragma" content="no-cache"></meta>
ENDNOREDIR

  if ($feedurl!~/^\/adm\/feedback/) { 
    $r->print('<meta HTTP-EQUIV="Refresh" CONTENT="2; url='.$feedurl.'">');
  }
  
  $r->print (<<ENDNOREDIRTWO);
</head>
<html>
<body bgcolor="#FFFFFF">
<img align=right src=/adm/lonIcons/lonlogos.gif>
<b>Sorry, no feedback possible on this resource  ...</b>
</body>
</html>
ENDNOREDIRTWO
}

sub screen_header {
  my ($feedurl) = @_;
  my $options='';
  if (($feedurl=~/^\/res/) && ($feedurl!~/^\/res\/adm/)) {
    $options= 
      '<p><input type=checkbox name=author> Feedback to resource author';
  }
  if ($ENV{'course.'.$ENV{'request.course.id'}.'.question.email'}) {
    $options.=
    '<br><input type=checkbox name=question> Question about resource content';
  }
  if ($ENV{'course.'.$ENV{'request.course.id'}.'.comment.email'}) {
    $options.=
      '<br><input type=checkbox name=course> '.
	'Question/Comment/Feedback about course content';
  }
  if ($ENV{'course.'.$ENV{'request.course.id'}.'.policy.email'}) {
    $options.=
      '<br><input type=checkbox name=policy> '.
	'Question/Comment/Feedback about course policy';
  }

  if ($ENV{'request.course.id'}) {
      if (&Apache::lonnet::allowed('pch',
        $ENV{'request.course.id'}.
        ($ENV{'request.course.sec'}?'/'.$ENV{'request.course.sec'}:''))) {
    $options.='<br><input type=checkbox name=discuss> '.
	'<b>Contribution to course discussion of resource</b>';
    $options.='<br><input type=checkbox name=anondiscuss> '.
	'<b>Anonymous contribution to course discussion of resource</b>'.
        ' (name only visible to course faculty)';
      }
  }
  return $options;
}

sub resource_output {
  my ($feedurl) = @_;
  my $usersaw=&Apache::lonnet::ssi($feedurl);
  $usersaw=~s/\<body[^\>]*\>//gi;
  $usersaw=~s/\<\/body\>//gi;
  $usersaw=~s/\<html\>//gi;
  $usersaw=~s/\<\/html\>//gi;
  $usersaw=~s/\<head\>//gi;
  $usersaw=~s/\<\/head\>//gi;
  $usersaw=~s/action\s*\=/would_be_action\=/gi;
  return $usersaw;
}

sub clear_out_html {
  my $message=$ENV{'form.comment'};
  $message=~s/\</\&lt\;/g;
  $message=~s/\>/\&gt\;/g;
  return $message;
}

sub assemble_email {
  my ($feedurl,$message,$prevattempts,$usersaw)=@_;
  my $email=<<"ENDEMAIL";
Refers to <a href="$feedurl">$feedurl</a>

$message
ENDEMAIL
    my $citations=<<"ENDCITE";
<h2>Previous attempts of student (if applicable)</h2>
$prevattempts
<p><hr>
<h2>Original screen output (if applicable)</h2>
$usersaw
ENDCITE
  return ($email,$citations);
}

sub decide_receiver {
  my ($feedurl) = @_;
  my $typestyle='';
  my %to=();
  if ($ENV{'form.author'}) {
    $typestyle.='Submitting as Author Feedback<br>';
    $feedurl=~/^\/res\/(\w+)\/(\w+)\//;
    $to{$2.':'.$1}=1;
  }
  if ($ENV{'form.question'}) {
    $typestyle.='Submitting as Question<br>';
    foreach (split(/\,/,
		   $ENV{'course.'.$ENV{'request.course.id'}.'.question.email'})
	     ) {
      $to{$_}=1;
    } 
  }
  if ($ENV{'form.course'}) {
    $typestyle.='Submitting as Comment<br>';
    foreach (split(/\,/,
		   $ENV{'course.'.$ENV{'request.course.id'}.'.comment.email'})
	     ) {
      $to{$_}=1;
    } 
  }
  if ($ENV{'form.policy'}) {
    $typestyle.='Submitting as Policy Feedback<br>';
    foreach (split(/\,/,
		   $ENV{'course.'.$ENV{'request.course.id'}.'.policy.email'})
	     ) {
      $to{$_}=1;
    } 
  }
  return ($typestyle,%to);
}

sub send_msg {
  my ($feedurl,$email,$citations,%to)=@_;
  my $status='';
  my $sendsomething=0;
  foreach (keys %to) {
    if ($_) {
      my $declutter=&Apache::lonnet::declutter($feedurl);
      unless (&Apache::lonmsg::user_normal_msg(split(/\:/,$_),
               'Feedback ['.$declutter.']',$email,$citations) eq 'ok') {
	$status.='<br>Error sending message to '.$_.'<br>';
      } else {
	$sendsomething++;
      }
    }
  }

    my %record=&Apache::lonnet::restore('_feedback');
    my ($temp)=keys %record;
    unless ($temp=~/^error\:/) {
       my %newrecord=();
       $newrecord{'resource'}=$feedurl;
       $newrecord{'subnumber'}=$record{'subnumber'}+1;
       unless (&Apache::lonnet::cstore(\%newrecord,'_feedback') eq 'ok') {
	   $status.='<br>Not registered<br>';
       }
    }
       
  return ($status,$sendsomething);
}

sub adddiscuss {
    my ($symb,$email,$anon)=@_;
    my $status='';
    if (&Apache::lonnet::allowed('pch',$ENV{'request.course.id'}.
        ($ENV{'request.course.sec'}?'/'.$ENV{'request.course.sec'}:''))) {

    my %contrib=('message'      => $email,
                 'sendername'   => $ENV{'user.name'},
                 'senderdomain' => $ENV{'user.domain'});
    if ($anon) {
	$contrib{'anonymous'}='true';
    }
    if (($symb) && ($email)) {
       $status='Adding to class discussion'.($anon?' (anonymous)':'').': '.
        &Apache::lonnet::store(\%contrib,$symb,$ENV{'request.course.id'},
                     $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
		     $ENV{'course.'.$ENV{'request.course.id'}.'.num'});
        my %storenewentry=($symb => time);
        $status.='<br>Updating discussion time: '.
        &Apache::lonnet::put('discussiontimes',\%storenewentry,
                     $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
		     $ENV{'course.'.$ENV{'request.course.id'}.'.num'});
    }
    my %record=&Apache::lonnet::restore('_discussion');
    my ($temp)=keys %record;
    unless ($temp=~/^error\:/) {
       my %newrecord=();
       $newrecord{'resource'}=$symb;
       $newrecord{'subnumber'}=$record{'subnumber'}+1;
       $status.='<br>Registering: '.
               &Apache::lonnet::cstore(\%newrecord,'_discussion');
    }
    } else {
	$status.='Failed.';
    }
    return $status.'<br>';   
}

sub handler {
  my $r = shift;
  if ($r->header_only) {
     $r->content_type('text/html');
     $r->send_http_header;
     return OK;
  }

# --------------------------- Get query string for limited number of parameters

    foreach (split(/&/,$ENV{'QUERY_STRING'})) {
       my ($name, $value) = split(/=/,$_);
       $value =~ tr/+/ /;
       $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
       if (($name eq 'hide') || ($name eq 'unhide')) {
           unless ($ENV{'form.'.$name}) {
              $ENV{'form.'.$name}=$value;
	   }
       }
    }

  if (($ENV{'form.hide'}) || ($ENV{'form.unhide'})) {
# ----------------------------------------------------------------- Hide/unhide
    $r->content_type('text/html');
    $r->send_http_header;

    my $entry=$ENV{'form.hide'}?$ENV{'form.hide'}:$ENV{'form.unhide'};

    my ($symb,$idx)=split(/\:\:\:/,$entry);
    my ($map,$ind,$url)=split(/\_\_\_/,$symb);

    my %contrib=&Apache::lonnet::restore($symb,$ENV{'request.course.id'},
                     $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
		     $ENV{'course.'.$ENV{'request.course.id'}.'.num'});

        
    my $currenthidden=$contrib{'hidden'};
    
    if ($ENV{'form.hide'}) {
	$currenthidden.='.'.$idx.'.';
    } else {
        $currenthidden=~s/\.$idx\.//g;
    }
    my %newhash=('hidden' => $currenthidden);

    &Apache::lonnet::store(\%newhash,$symb,$ENV{'request.course.id'},
                     $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
		     $ENV{'course.'.$ENV{'request.course.id'}.'.num'});

    &redirect_back($r,'/res/'.$url,'Changed discussion status<p>','0');

      
  } else {
# ------------------------------------------------------------- Normal feedback
  my $feedurl=$ENV{'form.postdata'};
  $feedurl=~s/^http\:\/\///;
  $feedurl=~s/^$ENV{'SERVER_NAME'}//;
  $feedurl=~s/^$ENV{'HTTP_HOST'}//;

  my $symb=&Apache::lonnet::symbread($feedurl);
  my $goahead=1;
  if ($feedurl=~/\.(problem|exam|quiz|assess|survey|form)$/) {
      unless ($symb) { $goahead=0; }
  }

  if ($goahead) {
# Go ahead with feedback, no ambiguous reference
    $r->content_type('text/html');
    $r->send_http_header;
  
    if (
      (
       ($feedurl=~m:^/res:) && ($feedurl!~m:^/res/adm:)
      ) 
      || 
      ($ENV{'request.course.id'} && ($feedurl!~m:^/adm:))
     ) {
# --------------------------------------------------- Print login screen header
    unless ($ENV{'form.sendit'}) {
      my $options=&screen_header($feedurl);
      if ($options) {
	&mail_screen($r,$feedurl,$options);
      } else {
	&fail_redirect($r,$feedurl);
      }
    } else {
      
# Get previous user input
      my $prevattempts=&Apache::loncommon::get_previous_attempt(
            $symb,$ENV{'user.name'},$ENV{'user.domain'},
            $ENV{'request.course.id'});

# Get output from resource
      my $usersaw=&resource_output($feedurl);

# Filter HTML out of message (could be nasty)
      my $message=&clear_out_html;

# Assemble email
      my ($email,$citations)=&assemble_email($feedurl,$message,$prevattempts,
          $usersaw);

# Who gets this?
      my ($typestyle,%to) = &decide_receiver($feedurl);

# Actually send mail
      my ($status,$numsent)=&send_msg($feedurl,$email,$citations,%to);

# Discussion? Store that.

      if ($ENV{'form.discuss'}) {
	  $typestyle.=&adddiscuss($symb,$message);
      }

      if ($ENV{'form.anondiscuss'}) {
	  $typestyle.=&adddiscuss($symb,$message,1);
      }


# Receipt screen and redirect back to where came from
      &redirect_back($r,$feedurl,$typestyle,$numsent,$status);

    }
   } else {
# Unable to give feedback
    &no_redirect_back($r,$feedurl);
   }
  } else {
# Ambiguous Problem Resource
    $r->internal_redirect('/adm/ambiguous');
  }
}
  return OK;
} 

1;
__END__
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