#!@PERL@
#
# nph-vf-gif - sends a required gif in required size
# 
# Copyright 1998 Simone Demmel simone@greenie.net
#
# RCS: $Id: nph-vf-gif.in,v 1.10 2004/11/17 14:08:11 gert Exp $
#
# $Log: nph-vf-gif.in,v $
# Revision 1.10  2004/11/17 14:08:11  gert
# predeclare variables (use vars)
#
# Revision 1.9  2001/07/16 09:23:30  neko
# support for "f1.g3.done" (sent jobs with sendfax -r)
# fix bug with "outgoing" files (HTML ref and real file name)
# if conversion fails (0-byte file), remove this, and complain
#
# Revision 1.8  2001/02/23 09:18:33  gert
# regex umgestellt, 2 warnings weniger
#
# Revision 1.7  1999/05/27 15:12:16  gert
# add support for viewing 'outgoing' fax queue
# (means restructuring about everything because of different directory layout)
#
# Revision 1.6  1998/12/04 15:29:53  gert
# include image refs for turn buttons
#
# Revision 1.5  1998/11/20 16:37:30  gert
# - set umask 022 (for temp files)
# - move parsing of CGI parameters to wwwsub.pl
# - check whether fax G3 file has read permissions
# - restructure "genpage"
#
# Revision 1.4  1998/11/20 10:06:46  gert
# move check for $fax_spool_out to wwwsub.pl
#
# Revision 1.3  1998/10/27 14:19:46  gert
# first cut finished
# - scaling implemented
# - checking of path names for directories and programs
# - wwwsub.pl
# - translate comments to English
# - rotating of images implemented
# - fold "vf-faxov.in" into this script
#
# Revision 1.2  1998/10/13 15:54:54  gert
# first working implementation...
# gotcha: do NOT substitute '+' -> ' ' in the QUERY_STRING (fax id!)
# gotcha: before doing perl regex match, substitute '+' -> '\+' (same for '?.*')
#
# Revision 1.1  1998/09/11 13:56:12  gert
# display HTML page with GIF images (scaled down) on it
#
#

#
# Script to generate various Fax-pictures and sending them
#

# sorry, no translation
# Aufgabe:
# - feststellen, ob das benoetigte Bild schon im tmp-Verzeichnis liegt
# - falls dem nicht so ist, neues Bild generieren und speichern
# - gewuenschtes Bild schicken
# - unterschiedliche Bildquelle source="incoming"|"outgoing"
#   beruecksichtigen
#

#
# Variables and checks
#

use vars qw (
                $turn_right
                $turn_updown
                $filename
                $turn_left
                $defaultsize
            );

# read configuration file
require "@CONFDIR@/wwwgui.conf";

# read common subroutine file
require "@LIBDIR@/wwwsub.pl";

# 
# send server-Headers, or you can't read the error-messages of
# the following checks...
#
# nph-script, so we have to generate all serverheaders manually...
#

print "HTTP/1.1 200 Document follows.\n";
print "Server: Nekobil/1.1\n";
print "Connection: close\n";
print "Content-Type: text/html\n\n";

# check, if fax-incoming is defined
check_incoming();

# check, if fax-outgoing is defined
check_outgoing();

# check, if the destination-Directory for pictures is readdy
check_directory($webtmpabs, "webtmpabs");
if (! -w $webtmpabs)
    { errormessage("\$webtmpabs : no write-permission for $webtmpabs");}
if (! -x $webtmpabs)
    { errormessage("\$webtmpabs : no execute-permission for $webtmpabs");}

# check, if $webtmprel is not empty
if ($webtmprel eq "") 
{
    errormessage( "\$webtmprel : not configured - please look at the configuration-Files and configure the URL for the temporary directory \$webtmpabs (\$webtmprel is missing!))");
}

# check, if $indexpage is not empty
if ($indexpage eq "") 
{
    errormessage( "\$indexpage : not configured - please look at the configuration-Files and configure the URL for my main-index-page (\$indexpage)");
}

checkprogram($g3topbm, "g3topbm");
checkprogram($ppmquant, "ppmquant");
checkprogram($pnmscale, "pnmscale");
checkprogram($ppmtogif, "ppmtogif");
checkprogram($pnmflip, "pnmflip");

#
# End of Variables
#

#
# no buffering by perl
#
$|=1;


# special version of get_cgi(), don't substitute +->" "
if (!get_cgi(0))
{errormessage("ERROR in CGI-Parsing: unsupported submission method");}

#
# now we have $args{file} and $args{size}
# and perhaps a $args{page} for one special page
# $args{source} says if to look into incoming or outgoing
# 
# $page tells, which page, if it is empty, send all pages...
#

# NEW! We need to know if incoming or outgoing, because of
# different naming-convention
if (defined $args{source})
	{ $source = $args{source}; }
else {errormessage("undefined source - missing \"incoming\" or \"outgoing\"");}

if (defined $args{file}) 
	{ $file = $args{file};
	  # $file =~ s/\%2B/\+/g;
	}
   # Debugging - no translation
   # im echten Betrieb noetig, beim Testen willich das so nicht
   # else { print "undefined Filename\n"; exit; }
   else { print "undefined Filename\n"; }

   # $nsize is the next size-step - automaticaly 10% more
if (defined $args{size}) { $size = $args{size}; $nsize = $size+10;}
                    else { $size = $defaultsize; $nsize = $size+10;}
if (defined ($args{page}))
{
    if ($args{page} eq "overview") { $page = $args{page}; }
    else { $page = sprintf "%02d", $args{page}; }
}
		   # im echten Betrieb mal sehen...
		   # else { $page = ""; }
else { $page = "all"; }

# check if there is a rotate given
if (defined $args{r})
{
    $turn=$args{r} %4;
}
else {$turn = 0;}

#
# $source eq "incoming"
# $file contains the complete Filename, without page-number
# $source eq "outgoing"
# $file contains the Directoryname, without filenames fir every page
# $size is a number between 0 and 100 (Percent-value)
#


# sorry, no translation
# 1. herausfinden, welche Seiten zu machen sind -> $page
# 2. schaun, ob die schon im tmp-Verzeichnis liegen
# 3. wenn nicht generieren...
# Ablauf: pro Bild: schaun -> (generieren) -> html-code raus
#

#
# $fax_incoming - incoming-Directory
# $fax_outgoing - outgoing Directory
# $file - complete Filename without .$page| directory-name
# $page - pagenumber in 2-digits format - must be changed back, if
# $source eq "outgoing"
#
# stored in tmp/  $file.$page.$size.gif
# $filename is the complete Filename (or Directoryname), with
# pagenumber (or without).
#

# make sure that the generated image files are not world-writable
umask 022;

# @bilder = "";

if ($source eq "outgoing" && 
    		$page<10 && 
    		$page ne "all" && 
    		$page ne "overview")
	{ $page = sprintf "%01d", $args{page}; }

if ($page =~ /^\d+$/ )
{ # generate this image
    www_head_gif();
    # DEBUGGING
    # print "pruefe Existenz von $fax_incoming/$file.$page<br>\n";
    if ( $source eq "incoming" && ! -f "$fax_incoming/$file.$page" )
    {
	print "Eine Seite $page oder ein Faxname $file existiert leider nicht.<p>\n";
    }
    elsif ($source eq "outgoing" 
	       && ! -f "$fax_outgoing/$file/f$page.g3"
		   && ! -f "$fax_outgoing/$file/f$page.g3.done")
    {
	print "Eine Seite f$page.g3 oder ein Directory $file existiert leider nicht.<p>\n";
    }
    else
    {
	if ($source eq "incoming")
	{
        	genpage("$file.$page");
	}
	if ($source eq "outgoing")
	{
		# DEBUGGING
		# print "call genpage(\"$file/f$page.g3\");";
        	genpage("$file/f$page.g3");
	}

        print "<a href=\"nph-vf-gif.cgi\?source=$source&size=$nsize&file=$file&page=$page&r=$turn\"><img src=\"$webtmprel/$file.$page.$size.$turn.gif\" alt=\"page $page\" border=\"0\"></a>\n";
        rotate_html($size, $file, $page);

    print " | ";
    }

    # does this page have a previous and a next page?

    if ($source eq "outgoing" && $page < 9) {$format="%d";}
		          else {$format="%02d";}

    $nextpage= sprintf $format, $page+1;
    $prevpage= sprintf $format, $page-1;
    # DEBUGGING
    # print "prevpage: $prevpage, nextpage: $nextpage ";

    # DEBUGGING
    # print "pruefe auf existenz von: $fax_incoming/$file.$nextpage und $prevpage\n<p>";
    if ($source eq "incoming" && -f "$fax_incoming/$file.$prevpage")
    {
        print "<a href=\"nph-vf-gif.cgi\?source=$source&size=$size&file=$file&page=$prevpage&r=$turn\">prev Page</a>\n";
    }
    elsif ($source eq "outgoing" && -f "$fax_outgoing/$file/f$prevpage.g3")
    {
        print "<a href=\"nph-vf-gif.cgi\?source=$source&size=$size&file=$file&page=$prevpage&r=$turn\">prev Page</a>\n";
    }
    else { print "no prev page\n"; } # es is uns wurscht

    if ($source eq "incoming" && -f "$fax_incoming/$file.$nextpage")
    {
        print "<a href=\"nph-vf-gif.cgi\?source=$source&size=$size&file=$file&page=$nextpage&r=$turn\">next Page</a>\n";
    }
    elsif ($source eq "outgoing" && -f "$fax_outgoing/$file/f$nextpage.g3")
    {
        print "<a href=\"nph-vf-gif.cgi\?source=$source&size=$size&file=$file&page=$nextpage&r=$turn\">next Page</a>\n";
    }
    else { print "no next page\n"; } # es is uns wurscht

}

elsif ($page eq "overview")
{   # only generate an overview (former vf-faxov.cgi)
    #
    # 1. herausfinden, welche Seiten zu machen sind -> $page
    #
    # $fax_incoming - incoming-Directory
    # $file - completer filename without .$page
    # $page - pagenumber in 2-digits format
    # call as - nph-vf-gif.cgi?size=20&file=fn23445&page=02
    #

    www_head_overview();

    my $match = $file;
    $match =~ s/([+*.?])/\\$1/g;
  
    # read incoming-Directory
    # print "<p>bin im else...<br>";

    if ($source eq "incoming")
    {
    	opendir DIR, $fax_incoming || print "cannot open incomingdir $fax_incoming\n";

    # print "habe $fax_incoming geoeffnet...<br>\n";
	@dateien = ();
    	foreach $DATEI ( readdir DIR )
    	{
	    # print "<br>\n   lese $DATEI ... vergleiche mit $match";
	    if ($DATEI =~ /^$match\.(\d+)$/) { push @dateien, $DATEI;}
	}
    	closedir (DIR);


	foreach $DATEI (sort(@dateien))
	{
	    	$DATEI =~ /^$match\.(\d+)$/;
            	my $pagenumber=$1;
	    	print "<br><a href=\"nph-vf-gif.cgi?source=$source&size=$size&file=$file&page=$pagenumber&r=$turn\">Seite $pagenumber</a>\n";
        }
        	# print "<br>\n nach IF";
    	# print "<br>\n nach DIR<br>\n";
    }

    elsif ($source eq "outgoing")
    {
    	opendir DIR, "$fax_outgoing/$match" || print "cannot open outgoingdir $fax_outgoing\n";

    # print "habe $fax_outgoing geoeffnet...<br>\n";
	@dateien = ();
    	foreach $DATEI ( readdir DIR )
    	{
	    # print "<br>\n   lese $DATEI ... vergleiche mit $match";
	    if ($DATEI =~ /^f(\d+).g3(\.done)*$/) { push @dateien, $DATEI;}
	}
    	closedir (DIR);


	foreach $DATEI (sort by_number (@dateien))
	{
	    	$DATEI =~ /^f(\d+).g3(\.done)*$/;
            	my $pagenumber = sprintf "%02d", $1;
	    	print "<br><a href=\"nph-vf-gif.cgi?source=$source&size=$size&file=$file&page=$pagenumber&r=$turn\">Seite $pagenumber</a>\n";
        }
        	# print "<br>\n nach IF";
    	# print "<br>\n nach DIR<br>\n";
    }


}


else { # $page eq "all"
    www_head_gif();
    my $match = $file;
    $match =~ s/([+*.?])/\\$1/g;

    # read incoming-Directory
    # print "<p>bin im else...<br>";

    if ($source eq "incoming")
    {
    	opendir DIR, $fax_incoming || print "cannot open incomingdir $fax_incoming\n";
	
    	# print "habe $fax_incoming geoeffnet...<br>\n";
	@dateien=();
    	foreach $DATEI ( readdir DIR )
    	{
	    # print "<br>\n   lese $DATEI ... vergleiche mit $match";
	    if ($DATEI =~ /^$match\.(\d+)$/) { push @dateien, $DATEI;}
	}
    	closedir (DIR);


	foreach $DATEI (sort(@dateien))
	{
	    	$DATEI =~ /^$match\.(\d+)$/;
	    	my $pagenumber=$1;
	    	# print "<br>generiere: $DATEI\n";
            	genpage($DATEI);
            	print "Seite $pagenumber: <a href=\"nph-vf-gif.cgi\?source=$source&size=$nsize&file=$file&page=$pagenumber&r=$turn\"><img src=\"$webtmprel/$DATEI.$size.$turn.gif\" alt=\"page $DATEI\" border=\"0\"></a>\n";
	    	rotate_html($size,$file,$pagenumber);
	}

		# print "<br>\n nach IF";
    	# print "<br>\n nach DIR<br>\n";
    }

    elsif ($source eq "outgoing")
    {
    	opendir DIR, "$fax_outgoing/$match" || print "cannot open outgoingdir $fax_outgoing\n";
	
    	# print "habe $fax_outgoing geoeffnet...<br>\n";
	@dateien = ();
    	foreach $DATEI ( readdir DIR )
    	{
	    # print "<br>\n   lese $DATEI ... vergleiche mit $match";
	     if ($DATEI =~ /^f(\d+).g3$/) { push @dateien, $DATEI;}
	}
    	closedir (DIR);


	foreach $DATEI (sort by_number(@dateien))
	{
	     	$DATEI =~ /^f(\d+).g3$/;
	    	my $page=sprintf "%02d", $1;
	    	my $pagenumber= $1;

		# DEBUGGING
	    	# print "<br>generiere: $file/$DATEI, page: $page, pagenumber: $pagenumber \$1: $1\n";
            	genpage("$file/$DATEI");
            	print "Seite $page: <a href=\"nph-vf-gif.cgi\?source=$source&size=$nsize&file=$file&page=$page&r=$turn\"><img src=\"$webtmprel/$file.$pagenumber.$size.$turn.gif\" alt=\"page $file - $DATEI \" border=\"0\"></a>\n";

	    	rotate_html($size,$file,$page);
	}

	# print "<br>\n nach IF";
    	# print "<br>\n nach DIR<br>\n";
    }

    else { print "cant happen..."; }

}

sub www_head_gif {
print <<EOF;
<html>
<head><title>Fax: $file</title></head>
<body bgcolor="#ffffff">
$www_logo

Filename: $file<br>
Gr&ouml;&szlig;e: $size\%<br>
Seite: $page
<br clear="all"><hr>
<p>

EOF
}

sub www_head_overview {
print <<EOF;
<html>
<head><title>Fax-Overview: $file</title></head>
<body bgcolor="#ffffff">
$www_logo

Filename: $file<br>
<br clear="all"><hr>
<p>

EOF

}

sub genpage {
    my $sfilename = shift;
    my $tfilename = $sfilename;
    if ($source eq "outgoing")
    {
	$tfilename =~ s/\/f/\./g;
	$tfilename =~ s/\.g3//g;   # now we don't need it here any longer
	$tfilename =~ s/\.done//g; # sometimes it is named ..g3.done
    }

    my $x=$size/100;
    my $y=$size/100;

    # DEBUGGING
    # print "<p>x= $x<br>y= $y<br> sfilename= $sfilename<br> tfilename=$tfilename<br> webtmpabs= $webtmpabs\n";


    # check if the File exists and has no 0 byte-length.
    # $turn from rotate
	if ( -z "$webtmpabs/$tfilename.$size.$turn.gif")
	{
	    print "<br>$webtmpabs/$tfilename.$size.$turn.gif has 0 byte length!  possible problems with $ppmquant - deleting file and generating new one<br>\n";
		unlink ("$webtmpabs/$tfilename.$size.$turn.gif") || print "<br>ERROR: could not unlink $webtmpabs/$tfilename.$size.$turn.gif: $!\n"; 
	}

    if ( -f "$webtmpabs/$tfilename.$size.$turn.gif")
    { 
	# print "<br> picture still there...\n";
	return;
    }

    # check if the file is readable
    if ($source eq "outgoing") { $fax_directory = $fax_outgoing; }
                          else { $fax_directory = $fax_incoming; }

	# DEBUGGING
	# print "<br> test for fax-file $fax_directory/$filename set\n";
    if (! (-r "$fax_directory/$sfilename")
	       && ! -r "$fax_directory/$sfilename.done")
    {
	print "<br> fax-file $fax_directory/$filename unreadable (UID $<)\n";
	return;
    }
	elsif (! (-r "$fax_directory/$sfilename")
	       && -r "$fax_directory/$sfilename.done")
    {
	    $sfilename = "$sfilename.done";
		# DEBUGGING 
		# print "<br> fax-file $fax_directory/$filename set\n";

    }


    # do this only, if the file exists and is readable
    if ($size != 100)
    {
	$gifscale = "$pnmscale -xscale $x -yscale $y | $ppmquant | $ppmtogif";
    }
    else
    { $gifscale = "$ppmtogif"; }

    # print "scale=$gifscale\n";

    # if we got a rotate
    if ($turn != 0)
	{ $r=sprintf "$pnmflip -r%d|", $turn*90; }
    else 
	{ $r = ""; }

    # DEBUGGING
     # print " system \"$g3topbm $fax_directory/$sfilename | $r $gifscale > $webtmpabs/$tfilename.$size.$turn.gif\";";
    system "$g3topbm $fax_directory/$sfilename | $r $gifscale > $webtmpabs/$tfilename.$size.$turn.gif";
}




sub rotate_html
{
    my $size = shift;
    my $file = shift;
    my $page = shift;

	# DEBUGGING
	# print "page: $page";
    # use(einbeziehen) $turn , can be 0, 1,2,3.
    my $format="<a href=\"nph-vf-gif.cgi\?source=$source&size=$size\&file=$file\&page=$page\&r=%d\">%s</a>\n";
    printf $format, $turn+1, "$turn_left";
    printf $format, $turn+2, "$turn_updown";
    printf $format, $turn+3, "$turn_right";
}

sub checkprogram
{
    my $filename = shift;
    my $variable = shift;
    # DEBUGGING
    # print "<p>habe als $variable: $filename\n";
    my @tmp = split /\s+/, $filename;
    $filename = $tmp[0];

    if ($filename eq "") 
    {
       errormessage ("no path for $variable available");
    }
    if (! -x $filename) 
    {
       errormessage ("$variable ($filename) is not executable");
    }
}


if ($source eq "outgoing")
{
	$back = "<a href=\"faxq.cgi\">zu sendende Faxe</a>\n"
}
else
{
	$back = "<a href=\"viewfax.cgi\">Eingegangene Faxe</a>\n"
}

print <<EOF;

<hr size="5">
<a href="$indexpage">^Hauptmenue</a>
$back

</body>
</html>
EOF

exit 0;

# sort helper - sort filenames f<n>.g3 in correct numerical order
sub by_number
{
    $a =~ /(\d+)/;
    my $num_a = $1;

    $b =~ /(\d+)/;
    my $num_b = $1;

    # DEBUGGING
    # print "$a, $b - $num_a, $num_b<br>\n";

    return $num_a <=> $num_b;
}