package Net::Hawk::Crypto;
use strict;
use warnings;
use 5.010;
use Moo;
use Types::Standard 1.000003 qw(Str Int Object Dict Optional Undef Any HasMethods HashRef slurpy);
use Types::URI qw(Uri);
use Type::Params qw(compile);
use Try::Tiny;
use Digest::SHA qw(hmac_sha1_base64 hmac_sha256_base64);
use Net::Hawk::Role::WithUtils;
use Net::Hawk::Types qw(Algorithm);
with WithUtils(qw(parse_content_type));
sub header_version() { 1 }
sub generate_normalized_string {
state $argcheck = compile(Object,Str,Dict[
resource => Uri,
ts => Int,
nonce => Str,
method => Optional[Str],
host => Str,
port => Int,
hash => Optional[Str],
ext => Optional[Str|Undef],
app => Optional[Str],
dlg => Optional[Str],
slurpy Any,
]);
my ($self,$type,$options) = $argcheck->(@_);
my $normalized = sprintf(
"hawk.%d.%s\n%d\n%s\n%s\n%s\n%s\n%d\n%s\n%s\n",
header_version(), $type,
$options->{ts},
$options->{nonce},
uc($options->{method} // ''),
$options->{resource}->path_query,
lc($options->{host}),
$options->{port},
$options->{hash} // '',
($options->{ext} // '') =~ s{\\}{\\\\}gr =~ s{\n}{\\n}gr,
);
if ($options->{app}) {
$normalized .= sprintf(
"%s\n%s\n",
$options->{app},
$options->{dlg} // '',
);
}
return $normalized;
}
sub calculate_payload_hash {
state $argcheck = compile(Object,Str|Undef,Algorithm,Str|Undef);
my ($self,$payload,$algorithm,$content_type) = $argcheck->(@_);
my $hash = $self->initialize_payload_hash($algorithm,$content_type);
$hash->add($payload//'');
return $self->finalize_payload_hash($hash);
}
sub calculate_mac {
state $argcheck = compile(
Object,Str,
Dict[
algorithm => Algorithm,
key => Str,
slurpy Any,
],
HashRef,
);
my ($self,$type,$credentials,$options) = $argcheck->(@_);
my $normalized = $self->generate_normalized_string($type,$options);
state $function_map = {
sha1 => \&hmac_sha1_base64,
sha256 => \&hmac_sha256_base64,
};
my $mac = $function_map->{$credentials->{algorithm}}->(
$normalized,$credentials->{key},
);
return _pad_b64($mac);
}
sub make_digest {
state $argcheck = compile(Object,Algorithm);
my ($self,$algorithm) = $argcheck->(@_);
return Digest::SHA->new($algorithm =~ s{^sha}{}r);
}
sub initialize_payload_hash {
state $argcheck = compile(Object,Algorithm,Str|Undef);
my ($self,$algorithm,$content_type) = $argcheck->(@_);
my $digest = $self->make_digest($algorithm);
$digest->add(sprintf("hawk.%d.payload\n",header_version()));
$digest->add($self->_utils->parse_content_type($content_type)."\n");
return $digest;
}
sub finalize_payload_hash {
state $argcheck = compile(Object,HasMethods[qw(add b64digest)]);
my ($self,$digest) = $argcheck->(@_);
$digest->add("\n");
return _pad_b64($digest->b64digest);
}
sub _pad_b64 {
my ($b64) = @_;
$b64 .= '=' while length($b64) % 4;
return $b64;
}
1;
