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|
package Spline::Srs;
use strict;
use warnings;
use Mail::SRS;
use base 'Exporter';
our @EXPORT = qw( );
our @EXPORT_OK = qw(
check_exclude
);
sub new {
my $class = shift;
my $opts = shift;
my $active_secret;
if (ref $opts->{secret} eq 'ARRAY') {
$active_secret = $opts->{secret}->[0];
}
else {
$active_secret = $opts->{secret};
}
if (length($active_secret // '') < 20) {
die 'You need to configure a suitable secret';
}
if (!$opts->{alias}) {
die 'You need to configure an alias domain';
}
my $self = {
alias => $opts->{alias} // '',
excludes => $opts->{excludes} // [],
srsalt_fallback => $opts->{srsalt_fallback} // 0,
srs => new Mail::SRS(
Secret => $opts->{secret} // '',
MaxAge => $opts->{max_age} // 49,
HashLength => $opts->{hash_length} // 5,
HashMin => $opts->{hash_min} // 5,
IgnoreTimestamp => $opts->{ignore_time} // 0,
),
};
bless $self, $class;
return $self;
}
sub check_exclude($@) {
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 $addr;
}
sub forward($) {
my $self = shift;
my $addr = shift;
return $addr if check_exclude($addr, $self->{excludes});
return $self->{srs}->forward($addr, $self->{alias});
}
sub reverse($) {
my $self = shift;
my $addr = shift;
if ($self->{srsalt_fallback}) {
my $result;
eval {
$result = $self->{srs}->reverse($addr);
};
my $err = $@;
if ($err) {
if ($err =~ m/Invalid hash/) {
my $fallback = replace_srsalt_chars($addr);
return $self->{srs}->reverse($fallback);
}
die $err;
}
return $result;
}
return $self->{srs}->reverse($addr);
}
sub handle($$) {
my $self = shift;
my ($map, $key) = @_;
my $result;
if ($map eq 'forward') {
$result = $self->forward($key);
}
elsif ($map eq 'reverse') {
$result = $self->reverse($key);
}
else {
return "PERM Invalid request";
}
if (!defined($result)) {
return 'NOTFOUND ';
}
else {
return 'OK ' . $result;
}
}
1;
# vim: set et ts=4:
|
