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#!/usr/local/bin/perl
############################################################################
# create-package-feed.pl
#
# Generates an RSS feed for the released files.
#
# Usage:
# create-package-feed.pl "path/to/release/files" "path/to/rss/outputfile"
#
# Copyright (c) 2016 "Unknown", Fabian Keil <fk@fabiankeil.de>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
############################################################################
use warnings;
use strict;
use Digest::SHA;
my @months = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec);
my @days = qw(Sun Mon Tue Wed Thu Fri Sat Sun);
my $base_dlurl = 'https://www.privoxy.org/sf-download-mirror/';
my $max_advertised_files = 100;
sub generate_rss_item($$$$) {
my ($target, $target_uri, $target_time, $target_sha256) = @_;
my $rss_item;
my $escaped_target_uri = $target_uri;
$escaped_target_uri =~ s@ @%20@g;
# RSS line
$rss_item =
'<item><title><![CDATA[' . $target_uri . ']]></title>';
$rss_item .=
'<description><![CDATA['
. $target_uri
. ' (SHA-256: '
. $target_sha256
. ')]]></description>';
$rss_item .=
'<link>'
. $base_dlurl
. $escaped_target_uri
. '</link><guid>'
. $base_dlurl
. $escaped_target_uri
. '</guid>';
$rss_item .= '<pubDate>';
my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) =
gmtime($target_time);
$rss_item .= sprintf("%s, %s %s %d %.2d:%.2d:%.2d GMT",
$days[$wday], $mday, $months[$mon], ($year + 1900),
$hour, $min, $sec);
$rss_item .= '</pubDate></item>';
$rss_item .= "\n";
return $rss_item;
}
sub get_sha256_sum($) {
my $file = shift;
open(my $fd, "<", $file)
or die "Can't open '$file' to generate checksum $!";
my $sha256 = Digest::SHA->new("SHA-256");
$sha256->addfile($fd);
close($fd);
return $sha256->hexdigest;
}
sub get_released_files($) {
my $scan_dir = shift;
my @Array = ();
my $i = 0;
my $target;
my $target_sha256;
my $target_uri;
my $target_time;
my $target_line;
opendir(my $D1, $scan_dir) or die "Can't open 1st directory! /";
while (my $fi1 = readdir($D1)) {
next if ($fi1 =~ m/^\./);
next if ($fi1 eq 'OldFiles' or $fi1 eq 'pkgsrc');
opendir(my $D2, $scan_dir . $fi1 . '/')
or die "Can't open 2nd directory! /$fi1";
while (my $fi2 = readdir($D2)) {
next if ($fi2 =~ m/^\./);
# Start listing /OS/Version/FILE
opendir(my $D3, $scan_dir . $fi1 . '/' . $fi2 . '/')
or die "Can't open 3rd directory! /$fi1/$fi2";
while (my $fi3 = readdir($D3)) {
next if ($fi3 =~ m/^\./);
$target = $scan_dir . $fi1 . '/' . $fi2 . '/' . $fi3;
next if (!-e $target); # skip if file is not exist
$target_uri = $fi1 . '/' . $fi2 . '/' . $fi3;
$target_time = (stat $target)[9];
$Array[$i] = ([$target_time, $target, $target_uri]);
$i++;
}
closedir($D3);
}
closedir($D2);
}
closedir($D1);
return sort { @$a[0] <=> @$b[0] } @Array;
}
sub generate_feed($) {
my $scan_dir = shift;
# Result = Full XML Codes
my $result = '<?xml version="1.0" encoding="utf-8"?>
<rss xmlns:content="http://purl.org/rss/1.0/modules/content/" version="2.0">
<channel>
<title>Privoxy Releases</title>
<link>https://www.privoxy.org/announce.txt</link>
<description><![CDATA[Privoxy Releases RSS feed]]></description>
<pubDate>';
my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) = gmtime();
$result .=
"$days[$wday], $mday $months[$mon] "
. ($year + 1900)
. " $hour:$min:$sec GMT";
$result .= '</pubDate>';
$result .= "\n";
my @resArray = get_released_files($scan_dir);
my $i = @resArray - 1;
while ($max_advertised_files-- > 0 && $i >= 0) {
my $target_time = $resArray[$i][0];
my $target = $resArray[$i][1];
my $target_uri = $resArray[$i][2];
my $target_sha256 = get_sha256_sum($target);
my $rss_item = generate_rss_item($target, $target_uri, $target_time, $target_sha256);
$result .= $rss_item;
$i--;
}
$result .= ' </channel>
</rss>';
return $result;
}
sub main() {
my $scan_dir = shift(@ARGV)
or die "Local package directory not specified (first argument)\n";
my $save_rss_file = shift(@ARGV)
or die "RSS output file path not specified (second argument)\n";
my $result = generate_feed($scan_dir);
open(my $XMLF, ">", $save_rss_file) or die "Failed to write XML file";
print $XMLF $result;
close($XMLF);
}
main();
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