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#!/usr/bin/perl -wT
#
# TWiki Collaboration Platform, http://TWiki.org/
#
# Copyright (C) 1999-2003 Peter Thoeny, peter@thoeny.com
#
# For licensing info read license.txt file in the TWiki root.
# This program 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.
#
# This program 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, published at
# http://www.gnu.org/copyleft/gpl.html

# Set library paths in @INC, at compile time
BEGIN { unshift @INC, '.'; require 'setlib.cfg'; }

use CGI::Carp qw(fatalsToBrowser);
use CGI;
use TWiki;

&main();

sub suffixToMimeType
{
    my( $theFilename ) = @_;

    my $mimeType = 'text/plain';
    if( $theFilename =~ /\.(.+)$/ ) {
        my $suffix = $1;
        my @types = grep{ s/^\s*([^\s]+).*?\s$suffix\s.*$/$1/i }
                    map{ "$_ " }
                    split( /[\n\r]/, &TWiki::Store::readFile( $TWiki::mimeTypesFilename ) );
        $mimeType = $types[0] if( @types );
    }
    return $mimeType;
}

sub main
{
    my $query = new CGI;

    my $thePathInfo = $query->path_info(); 
    my $theRemoteUser = $query->remote_user();
    my $theTopic = $query->param( 'topic' );
    my $theUrl = $query->url;

    ( $topic, $webName ) = 
	&TWiki::initialize( $thePathInfo, $theRemoteUser, $theTopic, $theUrl, $query );

    my $tmpl= "";

    if( ! &TWiki::Store::webExists( $webName ) ) {
        my $url = &TWiki::getOopsUrl( $webName, $topic, "oopsnoweb" );
        TWiki::redirect( $query, $url );
        return;
    }

    my $fileName = $query->param( 'filename' );

    my $rev = $query->param( 'rev' ) || "";
    my $topRev = &TWiki::Store::getRevisionNumber( $webName, $topic, $fileName );

    if( ( $rev ) && ( $rev ne $topRev ) ) {
        my $fileContent = &TWiki::Store::readAttachmentVersion( $webName, $topic, $fileName, $rev ); 
        if( $fileContent ) {
            my $mimeType = suffixToMimeType( $fileName );
            print $query->header( -type => $mimeType,
			  -Content_Disposition => "inline;filename=$fileName");
            print "$fileContent";
            return;
        } else {
            # If no file content we'll try and show pub content, should there be a warning FIXME
        }
    }

    # this should actually kick off a document conversion 
    # (.doc, .xls... to .html) and show the html file.
    # Convert only if html file does not yet exist
    # for now, show the original document:

    # PTh 20 Jun 2000: Added host
    my $pubUrlPath = &TWiki::getPubUrlPath();
    my $host = $TWiki::urlHost;
    TWiki::redirect( $query, "$host$pubUrlPath/$webName/$topic/$fileName" );
}