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#!/usr/bin/perl
#
# Program Summary:
#
# Name: dailystrips-update
# Description: downloads updated dailystrips definitions
# Author: Andrew Medico <amedico@amedico.dhs.org>
# Created: 29 May 2003, 10:07 EDT
# Last Modified: 29 May 2003, 17:03 EDT
# Current Revision: 1.0.0
#
# Set up
use strict;
no strict qw(refs);
use LWP::UserAgent;
use HTTP::Request;
use POSIX qw(strftime);
use Getopt::Long;
use File::Copy;
# Variables
my (%options, $version, $dailystrips_version);
$version = "1.0.0";
$dailystrips_version = "1.0.28";
# Get options
GetOptions(\%options, 'quiet|q','verbose','proxy=s',
'proxyauth=s','noenvproxy','version|v','help|h',
'retries=s','updates=s','minage=s') or exit 1;
# Process options:
# Note: Blocks have been ordered so that we only do as much as absolutely
# necessary if an error is encountered (i.e. do not load defs if --version
# specified)
# Help and version override anything else
if ($options{'help'}) {
print
"Usage: $0 [OPTIONS]
This program will attempt to download updated dailystrips definitions and save
the information to ~/.dailystrips-updates.def
Options:
-q --quiet Turn off progress messages
--verbose Turn on extra progress information, overrides -q
--proxy host:port Use specified HTTP proxy server (overrides
environment proxy, if set)
--proxyauth user:pass Set username and password for proxy server
--noenvproxy Ignore the http_proxy environment variable, if set
--retries NUM When downloading items, make NUM attempts instead
of only once
--updates FILE Save updates to FILE instead of
~/.dailystrips-updates.def
--minage NUM Skip downloading updates if local file is less than
NUM seconds old
-v --version Print version number
Bugs and comments to dailystrips\@amedico.dhs.org\n";
exit;
}
# Handle options that are needed first
if ($options{'version'}) {
print "dailystrips version $version\n";
exit;
}
if ($options{'retries'} =~ m/\D/) {
die "Error: 'retries' value must be numeric\n";
}
unless ($options{'retries'}) {
$options{'retries'} = 3;
}
#Set proxy
if ($options{'proxy'})
{
$options{'proxy'} =~ /^(http:\/\/)?(.*?):(.+?)\/?$/i;
unless ($2 and $3) {
die "Error: incorrectly formatted proxy server ('http://server:port' expected)\n";
}
$options{'proxy'} = "http://$2:$3";
}
if (!$options{'noenvproxy'} and !$options{'proxy'} and $ENV{'http_proxy'} ) {
$ENV{'http_proxy'} =~ /(http:\/\/)?(.*?):(.+?)\/?$/i;
unless ($2 and $3) {
die "Error: incorrectly formatted proxy server environment variable\n('http://server:port' expected)\n";
}
$options{'proxy'} = "http://$2:$3";
}
if ($options{'proxyauth'}) {
unless ($options{'proxyauth'} =~ /^.+?:.+?$/) {
die "Error: incorrectly formatted proxy credentials ('user:pass' expected)\n";
}
}
# verbose overrides quiet
if ($options{'verbose'} and $options{'quiet'}) {
undef $options{'quiet'};
}
# minimum age must be non-zero
if ($options{'minage'} =~ m/\D/) {
die "Error: 'minage' value must be numeric\n";
}
if ($options{'minage'} < 0) {
die "Error: 'minage' value must be >= 0\n";
}
unless ($options{'minage'}) {
$options{'minage'} = 0;
}
# 1 retry by default
unless ($options{'retries'}) {
$options{'retries'} = 1;
}
# default updates path
unless (defined $options{'updates'})
{
$options{'updates'} = &get_homedir() . "/.dailystrips-updates.def";
}
# Download new definitions and save
unless ($options{'quiet'})
{
print "dailystrips-update $version starting...\n";
}
&get_updated_defs($options{'updates'});
sub http_get {
my ($url, $referer) = @_;
my ($request, $response, $status);
my $headers = new HTTP::Headers;
$headers->proxy_authorization_basic(split(/:/, $options{'proxyauth'}));
$headers->referer($referer);
my $ua = LWP::UserAgent->new;
$ua->agent($options{'useragent'});
$ua->proxy('http', $options{'proxy'});
for (1 .. $options{'retries'}) {
# main request
$request = HTTP::Request->new('GET', $url, $headers);
$response = $ua->request($request);
($status = $response->status_line()) =~ s/^(\d+)/$1:/;
if ($response->is_error()) {
if ($options{'verbose'}) {
warn "Warning: could not download $url: $status (attempt $_ of $options{'retries'})\n";
}
} else {
return $response->content;
}
}
# if we get here, URL retrieval completely failed
warn "Warning: failed to download $url\n";
return "ERROR: $status";
}
sub get_updated_defs
{
# set parameters
my $updates_file = shift;
my $updates_rev_url = "http://dailystrips.sourceforge.net/UPDATES/ds-update-" . $dailystrips_version . ".rev";
my $updates_url = "http://dailystrips.sourceforge.net/UPDATES/ds-update-" . $dailystrips_version;
my $local_revision = 0;
my $remote_revision = 0;
# only update if local update file is old enough
if (time() - (stat($updates_file))[9] < $options{'minage'})
{
if ($options{'verbose'})
{
print "Existing file is too new, exiting\n";
}
return;
}
# check revision of local file
if (open(UPDATES,"<$updates_file")) # or die "Error: cannot read updates file: $!\n";
{
while(<UPDATES>)
{
if (/^#REVISION:\s*(\-?\d+)/i)
{
$local_revision = $1;
#print "line in local: $_\n";
last;
}
}
close(UPDATES);
}
if ($options{'verbose'})
{
print "Local revision: $local_revision\n";
}
# find current revision
my $updates_rev = &http_get($updates_rev_url);
if ($updates_rev =~ /^ERROR/)
{
die "Error: failed to download updates\n";
}
# check revision of downloaded file
for(split(/\n/, $updates_rev))
{
if (/^#REVISION:\s*(\-?\d+)/)
{
$remote_revision = $1;
last;
}
}
if ($options{'verbose'})
{
print "Remote revision: $remote_revision\n";
}
# if there is a newer file available, download and save it
if ($remote_revision > $local_revision)
{
unless ($options{'quiet'})
{
print "Downloading updated definitions...";
}
# download updates
my $updates = &http_get($updates_url);
if ($updates =~ /^ERROR/)
{
print "failed\n";
die "Error: failed to download updates\n";
}
unless ($options{'quiet'})
{
print "done\n";
}
open(UPDATES,">$updates_file") or die "Error: cannot write updates ($updates_file) file: $!\n";
print UPDATES $updates;
close(UPDATES);
}
else
{
unless($options{'quiet'})
{
print "Local file is already latest revision, exiting.\n";
}
}
}
sub get_homedir
{
if ($^O =~ /Win32/ )
{
my $dir = $ENV{'USERPROFILE'};
if ($dir eq "") {$dir = $ENV{'WINDIR'};}
$dir =~ s|\\|/|g;
return $dir;
}
else
{
return (getpwuid($>))[7];
}
}
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