# The LearningOnline Network with CAPA
# Handler to rename files, etc, in construction space
#
# $Id: loncfile.pm,v 1.8 2002/01/21 17:13:49 albertel 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/
#
#
# (Handler to retrieve an old version of a file
#
# (Publication Handler
# 
# (TeX Content Handler
#
# 05/29/00,05/30,10/11 Gerd Kortemeyer)
#
# 11/28,11/29,11/30,12/01,12/02,12/04,12/23 Gerd Kortemeyer
# 03/23 Guy Albertelli
# 03/24,03/29 Gerd Kortemeyer)
#
# 03/31,04/03,05/02,05/09,06/23,06/24 Gerd Kortemeyer)
#
# 06/23 Gerd Kortemeyer

package Apache::loncfile;

use strict;
use Apache::File;
use File::Copy;
use Apache::Constants qw(:common :http :methods);
use Apache::loncacc;

sub exists {
    my ($uname,$udom,$dir,$newfile)=@_;
    my $published='/home/httpd/html/res/'.$udom.'/'.$uname.'/'.$dir.'/'.
	$ENV{'form.newfilename'};
    my $construct='/home/'.$uname.'/public_html/'.$dir.'/'.
	$ENV{'form.newfilename'};
    my $result;
    if (-e $published) {
	$result.='<p><font color=red>Warning: target file exists, and has been published!</font></p>';
    } elsif ( -e $construct ) {
	$result.='<p><font color=red>Warning: target file exists!</font></p>';
    }
    return $result;
}

sub checksuffix {
    my ($old,$new) = @_;
    my $result;
    my $oldsuffix;
    my $newsuffix;
    if ($new=~m:(.*/*)([^/]+)\.(\w+)$:) { $newsuffix=$3; }
    if ($old=~m:(.*)/+([^/]+)\.(\w+)$:) { $oldsuffix=$3; }
    if ($oldsuffix ne $newsuffix) {
	$result.='<p><font color=red>Warning: change of MIME type!</font></p>';
    }
    return $result;
}

sub phaseone {
    my ($r,$fn,$uname,$udom)=@_;

    $fn=~m:(.*)/([^/]+)\.(\w+)$:;
    my $dir=$1;
    my $main=$2;
    my $suffix=$3;

    my $conspace='/home/'.$uname.'/public_html'.$fn;

    $r->print('<form action=/adm/cfile method=post>'.
	      '<input type=hidden name=filename value="/~'.$uname.$fn.'">'.
              '<input type=hidden name=phase value=two>'.
              '<input type=hidden name=action value='.$ENV{'form.action'}.'>');

    if ($ENV{'form.action'} eq 'rename') {
	if (-e $conspace) {
	    if ($ENV{'form.newfilename'}) {
		$r->print(&checksuffix($fn,$ENV{'form.newfilename'}));
		$r->print(&exists($uname,$udom,$dir,$ENV{'form.newfilename'}));
	       $r->print('<input type=hidden name=newfilename value="'.
                         $ENV{'form.newfilename'}.
                         '"><p>Rename <tt>'.$fn.'</tt> to <tt>'.
                         $dir.'/'.$ENV{'form.newfilename'}.'</tt>?</p>');
	    } else {
	       $r->print('<p>No new filename specified.</p></form>');
               return;
	    }
        } else {
	    $r->print('<p>No such file.</p></form>');
            return;
        }
    } elsif ($ENV{'form.action'} eq 'delete') { 
	if (-e $conspace) {
            $r->print('<p>Delete <tt>'.$fn.'</tt>?</p>');
        } else {
	    $r->print('<p>No such file.</p></form>');
            return;
        }
    } elsif ($ENV{'form.action'} eq 'copy') { 
	if (-e $conspace) {
	    if ($ENV{'form.newfilename'}) {
		$r->print(&checksuffix($fn,$ENV{'form.newfilename'}));
		$r->print(&exists($uname,$udom,$dir,$ENV{'form.newfilename'}));
	       $r->print('<input type=hidden name=newfilename value="'.
                         $ENV{'form.newfilename'}.
                         '"><p>Copy <tt>'.$fn.'</tt> to <tt>'.
                         $dir.'/'.$ENV{'form.newfilename'}.'</tt>?</p>');
	    } else {
	       $r->print('<p>No new filename specified.</p></form>');
               return;
	    }
        } else {
	    $r->print('<p>No such file.</p></form>');
            return;
        }
    } elsif ($ENV{'form.action'} eq 'newdir') {
        my $newdir='/home/'.$uname.'/public_html/'.
                   $fn.$ENV{'form.newfilename'};
	if (-e $newdir) {
            $r->print('<p>Directory exists.</p></form>');
            return;
        }
	$r->print('<input type=hidden name=newfilename value="'.
                  $ENV{'form.newfilename'}.
                  '"><p>Make new directory <tt>'.
                  $fn.$ENV{'form.newfilename'}.'</tt>?</p>');
       
    }
    $r->print('<p><input type=submit value=Continue></p></form>');
    $r->print('<form action="/priv/'.$uname.$fn.
	      '" method="GET"><p><input type=submit value=Cancel></p></form>');

}

sub phasetwo {
    my ($r,$fn,$uname,$udom)=@_;

    $fn=~/(.*)\/([^\/]+)\.(\w+)$/;
    my $dir=$1;
    my $main=$2;
    my $suffix=$3;

    my $conspace='/home/'.$uname.'/public_html'.$fn;

    if ($ENV{'form.action'} eq 'rename') {
	if (-e $conspace) {
	    if ($ENV{'form.newfilename'}) {
               unless (rename('/home/'.$uname.'/public_html'.$fn,
          '/home/'.$uname.'/public_html'.$dir.'/'.$ENV{'form.newfilename'})) {
	    $r->print('<font color=red>Error: '.$!.'</font>');
               }
            }
        } else {
	    $r->print('<p>No such file.</form>');
            return;
        }
    } elsif ($ENV{'form.action'} eq 'delete') { 
	if (-e $conspace) {
            unless (unlink('/home/'.$uname.'/public_html'.$fn)) {
	       $r->print('<font color=red>Error: '.$!.'</font>');
            }
        } else {
	    $r->print('<p>No such file.</form>');
            return;
        }
    } elsif ($ENV{'form.action'} eq 'copy') { 
	if (-e $conspace) {
	    if ($ENV{'form.newfilename'}) {
               unless (copy('/home/'.$uname.'/public_html'.$fn,
           '/home/'.$uname.'/public_html'.$dir.'/'.$ENV{'form.newfilename'})) {
	          $r->print('<font color=red>Error: '.$!.'</font>');
               }
	    } else {
	       $r->print('<p>No new filename specified.</form>');
               return;
	    }
        } else {
	    $r->print('<p>No such file.</form>');
            return;
        }
    } elsif ($ENV{'form.action'} eq 'newdir') {
        my $newdir='/home/'.$uname.'/public_html/'.
                   $fn.$ENV{'form.newfilename'};
        unless (mkdir($newdir,0770)) {
	    $r->print('<font color=red>Error: '.$!.'</font>');
        }
        $r->print('<h3><a href="/priv/'.$uname.$fn.'/">Done</a></h3>');
        return;
    }
    $r->print('<h3><a href="/priv/'.$uname.$dir.'/">Done</a></h3>');
}

sub handler {

  my $r=shift;

  my $fn;

  if ($ENV{'form.filename'}) {
      $fn=$ENV{'form.filename'};
      $fn=~s/^http\:\/\/[^\/]+//;
  } else {
     $r->log_reason($ENV{'user.name'}.' at '.$ENV{'user.domain'}.
         ' unspecified filename for cfile', $r->filename); 
     return HTTP_NOT_FOUND;
  }

  unless ($fn) { 
     $r->log_reason($ENV{'user.name'}.' at '.$ENV{'user.domain'}.
         ' trying to cfile non-existing file', $r->filename); 
     return HTTP_NOT_FOUND;
  } 

# ----------------------------------------------------------- Start page output
  my $uname;
  my $udom;

  ($uname,$udom)=
    &Apache::loncacc::constructaccess($fn,$r->dir_config('lonDefDomain'));
  unless (($uname) && ($udom)) {
     $r->log_reason($uname.' at '.$udom.
         ' trying to manipulate file '.$ENV{'form.filename'}.
         ' ('.$fn.') - not authorized', 
         $r->filename); 
     return HTTP_NOT_ACCEPTABLE;
  }

  $fn=~s/\/\~(\w+)//;

  $r->content_type('text/html');
  $r->send_http_header;

  $r->print('<html><head><title>LON-CAPA Construction Space</title></head>');

  $r->print(
   '<body bgcolor="#FFFFFF"><img align=right src=/adm/lonIcons/lonlogos.gif>');

  
  $r->print('<h1>Construction Space <tt>'.$fn.'</tt></h1>');
  
  if (($uname ne $ENV{'user.name'}) || ($udom ne $ENV{'user.domain'})) {
          $r->print('<h3><font color=red>Co-Author: '.$uname.' at '.$udom.
               '</font></h3>');
  }

  if ($ENV{'form.action'} eq 'delete') {
      $r->print('<h3>Delete</h3>');
  } elsif ($ENV{'form.action'} eq 'rename') {
      $r->print('<h3>Rename</h3>');
  } elsif ($ENV{'form.action'} eq 'newdir') {
      $r->print('<h3>New Directory</h3>');
  } elsif ($ENV{'form.action'} eq 'copy') {
      $r->print('<h3>Copy</h3>');
  } else {
     $r->print('<p>Unknown Action</body></html>');
     return OK;  
  }
  if ($ENV{'form.phase'} eq 'two') {
      &phasetwo($r,$fn,$uname,$udom);
  } else {
      &phaseone($r,$fn,$uname,$udom);
  }

  $r->print('</body></html>');
  return OK;  
}

1;
__END__