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package pdf2html;
use strict;
=pod
=head1 NAME
pdf2html - swish-e sample module to convert pdf to html
=head1 SYNOPSIS
use pdf2html;
my $html_record_ref = pdf2html( $pdf_file_name, 'title' );
# or by passing content in a scalar reference
my $html_text_ref = pdf2html( \$pdf_content, 'title' );
=head1 DESCRIPTION
Sample module for use with other swish-e 'prog' document source programs.
Pass either a file name, or a scalar reference.
The differece is when you pass a reference to a scalar
only the content is returned. When you pass a file name
an entire record is returned ready to be fed to swish -- this
includes the headers required by swish for indexing.
The second optional parameter is the extracted PDF info tag to use as the HTML title.
The plan is to find a library that will do this to avoid forking an external
program.
=head1 REQUIREMENTS
Uses the xpdf package that includes the pdftotext conversion program.
This is available from http://www.foolabs.com/xpdf/xpdf.html.
You will also need the module File::Temp (and its dependencies)
available from CPAN if passing content to this module (instead of a file name).
=head1 AUTHOR
Bill Moseley
=cut
use Symbol;
use vars qw(
@ISA
@EXPORT
$VERSION
);
# $Id: pdf2html.pm,v 1.8 2003/06/12 04:00:45 whmoseley Exp $
$VERSION = sprintf '%d.%02d', q$Revision: 1.8 $ =~ /: (\d+)\.(\d+)/;
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(pdf2html);
if ( $0 eq 'pdf2html.pm' ) {
my $file = shift || die "Usage: perl pdf2html.pm file.pdf [title tag]\n";
my $title = shift;
print ${pdf2html( $file, $title )};
}
sub pdf2html {
my $file_or_content = shift;
my $title_tag = shift;
my $file = ref $file_or_content
? create_temp_file( $file_or_content )
: $file_or_content;
my $metadata = get_pdf_headers( $file );
my $headers = format_metadata( $metadata );
if ( $title_tag && exists $metadata->{ $title_tag } ) {
my $title = escapeXML( $metadata->{ $title_tag } );
$headers = "<title>$title</title>\n" . $headers
}
# Check for encrypted content
my $content_ref;
# patch provided by Martial Chartoire
if ( $metadata->{encrypted} && $metadata->{encrypted} =~ /yes\.*\scopy:no\s\.*/i ) {
$content_ref = \'';
} else {
$content_ref = get_pdf_content_ref( $file );
}
my $txt = <<EOF;
<html>
<head>
$headers
</head>
<body>
<pre>
$$content_ref
</pre>
</body>
</html>
EOF
if ( ref $file_or_content ) {
# unlink $file;
return \$txt;
}
my $mtime = (stat $file )[9];
my $size = length $txt;
my $ret = <<EOF;
Content-Length: $size
Last-Mtime: $mtime
Path-Name: $file
EOF
$ret .= $txt;
return \$ret;
}
sub get_pdf_headers {
my $file = shift;
my $sym = gensym;
# This doesn't work
my $path = $file;
for ( $path ) {
s/"/\\"/g;
$path = qq["$path"];
}
open $sym, "pdfinfo $path |" || die "$0: Failed to open $file $!";
my %metadata;
while (<$sym>) {
if ( /^\s*([^:]+):\s+(.+)$/ ) {
my ( $metaname, $value ) = ( lc( $1 ), $2 );
$metaname =~ tr/ /_/;
$metadata{$metaname} = $value;
}
}
close $sym or warn "$0: Failed close on pipe to pdfinfo for $file: $?";
return \%metadata;
}
sub format_metadata {
my $metadata = shift;
my $metas = join "\n", map {
qq[<meta name="$_" content="] . escapeXML( $metadata->{$_} ) . '">';
} sort keys %$metadata;
return $metas;
}
sub get_pdf_content_ref {
my $file = shift;
# This doesn't work
my $path = $file;
for ( $path ) {
s/"/\\"/g;
$path = qq["$path"];
}
my $sym = gensym;
open $sym, "pdftotext $path - |" or die "$0: failed to run pdftotext: $!";
local $/ = undef;
my $content = escapeXML(<$sym>);
close $sym or warn "$0: Failed close on pipe to pdftotext for $file: $?";
return \$content;
}
# How are URLs printed with pdftotext?
sub escapeXML {
my $str = shift;
for ( $str ) {
s/&/&/go;
s/"/"/go;
s/</</go;
s/>/>/go;
}
return $str;
}
# This is the portable way to do this, I suppose.
# Otherwise, just create a file in the local directory.
sub create_temp_file {
my $scalar_ref = shift;
require "File/Temp.pm";
my ( $fh, $file_name ) = File::Temp::tempfile();
print $fh $$scalar_ref or die $!;
close $fh or die "Failed to close '$file_name' $!";
return $file_name;
}
1;
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