Added Piny::Auth.

1 files changed, 74 insertions, 0 deletions

diff --git a/libpiny/lib/Piny/Auth.pm b/libpiny/lib/Piny/Auth.pm
new file mode 100644
index 0000000..2bbf60b
--- /dev/null
+++ b/libpiny/lib/Piny/Auth.pm
@@ -0,0 +1,74 @@
+# Copyright © 2010 Julian Blake Kongslie <jblake@omgwallhack.org>
+# Licensed under the BSD 3-clause license.
+
+use strict;
+use warnings;
+
+package Piny::Auth;
+
+use Moose;
+use MooseX::StrictConstructor;
+
+use Digest::HMAC_SHA1;
+
+# Attributes
+
+has 'key' =>
+  ( is          => 'ro'
+  , isa         => 'String'
+  , lazy_build  => 1
+  );
+
+# Public methods
+
+sub hash {
+  my ( $s, $params ) = @_;
+
+  my $hmac = Digest::HMAC_SHA1->new( $s->key );
+
+  if ( ref $params ) {
+    foreach my $key ( sort keys %$params ) {
+      $hmac->add( length( $key ) . "\0" . $key . "\0" . length( $params->{$key} ) . "\0" . $params->{$key} . "\0" );
+    };
+  } else {
+    $hmac->add( $params );
+  };
+
+  return $hmac->b64digest;
+};
+
+# Builder methods
+
+# If constructed with just one argument, then treat it as the key.
+around BUILDARGS => sub {
+  my ( $orig, $class ) = ( shift, shift );
+
+  if ( @_ == 1 && ! ref $_[0] ) {
+    return $class->$orig( key => $_[0] );
+  } else {
+    return $class->$orig( @_ );
+  };
+};
+
+sub _build_key {
+  my ( $s ) = @_;
+
+  open( my $fh, "<", "/etc/libpiny.key" ) or die "Can't open libpiny.key: $!";
+
+  my $key;
+
+  {
+    local $/;
+    $key = <$fh>;
+  };
+
+  close( $fh );
+
+  return $key;
+};
+
+# Moose boilerplate
+
+__PACKAGE__->meta->make_immutable;
+
+1;