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|
package Spline::Srs;
use strict;
use warnings;
use Mail::SRS;
use Spline::Netstring;
use base 'Exporter';
our @EXPORT = qw( );
our @EXPORT_OK = qw(
config_set
config_get
check_exclude
srs_forward
srs_reverse
);
my $config = {
alias => '',
excludes => [],
secret => '',
max_age => 49,
hash_length => 5,
hash_min => 5,
ignore_time => 0,
srsalt_fallback => 0,
};
my $srs = undef;
sub config_set($$) {
my ($key, $value) = @_;
return unless defined $config->{$key};
$config->{$key} = $value;
$srs = undef;
}
sub config_get($) {
my $key = shift;
return $config->{$key};
}
sub check_exclude($@) {
my ($addr, $excludes) = @_;
return 0 unless ref($excludes) eq 'ARRAY';
my @parts = split(/@/, $addr);
my $domain = $parts[-1];
for my $exclude (@$excludes) {
if ($exclude =~ m/^\./) {
return 1 if $domain =~ m/\Q$exclude\E$/;
}
else {
return 1 if $domain eq $exclude;
}
}
return 0;
}
sub replace_srsalt_chars($) {
my $addr = shift;
if ($addr =~ m/^(SRS[01][=+-])([^=]+)(=.*)$/) {
my ($srs, $hash, $rest) = ($1, $2, $3);
$hash =~ s#_#+#g;
$hash =~ s#\.#/#g;
return "$srs$hash$rest";
}
return $addr;
}
sub srs_forward($) {
my $addr = shift;
return $addr if check_exclude($addr, $config->{excludes});
check_configured();
return $srs->forward($addr, $config->{alias});
}
sub srs_reverse($) {
my $addr = shift;
check_configured();
if ($config->{srsalt_fallback}) {
my $result;
eval {
$result = $srs->reverse($addr);
};
my $err = $@;
if ($err) {
if ($err =~ m/Invalid hash/) {
my $fallback = replace_srsalt_chars($addr);
return $srs->reverse($fallback);
}
die $err;
}
return $result;
}
return $srs->reverse($addr);
}
sub check_configured() {
return if defined $srs;
if (length($config->{secret}) < 20) {
die 'You need to configure a suitable secret';
}
if (!$config->{alias}) {
die 'You need to configure an alias domain';
}
$srs = new Mail::SRS(
Secret => $config->{secret},
MaxAge => $config->{max_age},
HashLength => $config->{hash_length},
HashMin => $config->{hash_min},
IgnoreTimestamp => $config->{ignore_time},
);
}
sub handle($$) {
my ($map, $key) = @_;
my $result;
if ($map eq 'forward') {
$result = srs_forward($key);
}
elsif ($map eq 'reverse') {
$result = srs_reverse($key);
}
else {
return "PERM Invalid request";
}
if (!defined($result)) {
return 'NOTFOUND ';
}
else {
return 'OK ' . $result;
}
}
1;
# vim: set et ts=4:
|
