# The LearningOnline Network with CAPA
# Handler to show differences between file versions
#
# (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 Gerd Kortemeyer)
#
# 05/02/01,05/09 Gerd Kortemeyer
package Apache::londiff;
use strict;
use Apache::File;
use File::Copy;
use Algorithm::Diff qw(diff);
use Apache::Constants qw(:common :http :methods);
use Apache::loncacc;
sub handler {
my $r=shift;
# Get query string for limited number of parameters
map {
my ($name, $value) = split(/=/,$_);
$value =~ tr/+/ /;
$value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
if (($name eq 'filename') || ($name eq 'versiontwo') ||
($name eq 'versionone')) {
unless ($ENV{'form.'.$name}) {
$ENV{'form.'.$name}=$value;
}
}
} (split(/&/,$ENV{'QUERY_STRING'}));
# Get the files
my $cuname=$ENV{'user.name'};
my $cudom=$ENV{'user.domain'};
unless (($cuname,$cudom)=
&Apache::loncacc::constructaccess($ENV{'form.filename'},
$r->dir_config('lonDefDomain'))) {
$r->log_reason($cuname.' at '.$cudom.
' trying to get diffs file '.$ENV{'form.filename'}.
' - not authorized',
$r->filename);
return HTTP_NOT_ACCEPTABLE;
}
my $efn=$ENV{'form.filename'};
$efn=~s/\/\~(\w+)//g;
my @f1=();
my @f2=();
$r->content_type('text/html');
$r->send_http_header;
$r->print('LON-CAPA Construction Diffs');
$r->print('');
$r->print('Compare versions of '.$efn.'
');
if (($cuname ne $ENV{'user.name'}) || ($cudom ne $ENV{'user.domain'})) {
$r->print('Co-Author: '.$cuname.' at '.$cudom.
'
');
}
if (&Apache::lonnet::fileembstyle(($efn=~/\.(\w+)$/)) eq
'ssi') {
if ($ENV{'form.versionone'} eq 'priv') {
my $fn='/home/'.$cuname.'/public_html/'.$efn;
if (-e $fn) {
my $fh=Apache::File->new($fn);
my $line;
while($line=<$fh>) {
chomp($line);
$f1[$#f1+1]=$line;
}
}
$r->print('Construction Space Version
');
} else {
my $fn=
'/home/httpd/html//res/'.$cudom.'/'.$cuname.'/';
if ($ENV{'form.versionone'}) {
my ($main,$suffix)=($efn=~/^(.+)\.(\w+)$/);
$fn.=$main.'.'.$ENV{'form.versionone'}.'.'.$suffix;
$r->print('Version '.$ENV{'form.versionone'}.'
');
} else {
$fn.=$efn;
$r->print('Current Version
');
}
@f1=split(/\n/,&Apache::lonnet::getfile($fn));
}
$r->print('versus');
if ($ENV{'form.versiontwo'} eq 'priv') {
my $fn='/home/'.$cuname.'/public_html/'.$efn;
if (-e $fn) {
my $fh=Apache::File->new($fn);
my $line;
while($line=<$fh>) {
chomp($line);
$f2[$#f2+1]=$line;
}
}
$r->print('Construction Space Version
');
} else {
my $fn=
'/home/httpd/html/res/'.$cudom.'/'.$cuname.'/';
if ($ENV{'form.versiontwo'}) {
my ($main,$suffix)=($efn=~/^(.+)\.(\w+)$/);
$fn.=$main.'.'.$ENV{'form.versiontwo'}.'.'.$suffix;
$r->print('Version '.$ENV{'form.versiontwo'}.'
');
} else {
$fn.=$efn;
$r->print('Current Version
');
}
@f2=split(/\n/,&Apache::lonnet::getfile($fn));
}
# Run diff
my $diffs = diff(\@f1, \@f2);
# Start page output
my $chunk;
my $line;
$r->print('');
foreach $chunk (@$diffs) {
foreach $line (@$chunk) {
my ($sign, $lineno, $text) = @$line;
$text=~s/\/\>\;/g;
$lineno=substr($lineno.' ',0,7);
$r->print(''.
$sign.' '.$lineno.' '.$text."\n");
}
$r->print("
\n");
}
$r->print('');
} else {
$r->print('Binary File
');
}
$r->print('');
return OK;
}
1;
__END__
500 Internal Server Error
Internal Server Error
The server encountered an internal error or
misconfiguration and was unable to complete
your request.
Please contact the server administrator at
root@localhost to inform them of the time this error occurred,
and the actions you performed just before this error.
More information about this error may be available
in the server error log.