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lib/Finance/Bank/Cahoot/CredentialsProvider/CryptFile.pm  view on Meta::CPAN

# Copyright (c) 2007 Jon Connell.
# All Rights Reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.

package Finance::Bank::Cahoot::CredentialsProvider::CryptFile;
use base qw(Finance::Bank::Cahoot::CredentialsProvider);

use strict;
use warnings 'all';
use vars qw($VERSION);

$VERSION = '1.07';

use Carp qw(croak);
use Crypt::CBC;
use English '-no_match_vars';
use File::Slurp qw(slurp);
use IO::File;

sub _init
{
  my ($self, $options) = @_;

  croak 'No key provided' if not defined $options->{key};
  my $cipher = Crypt::CBC->new(-key    => $options->{key},
			       -cipher => 'DES_PP');
  my $keyfile = $options->{keyfile};
  $keyfile = $ENV{HOME}.'/.cahoot' if not defined $keyfile;

  if (-e $keyfile) {
    my $fh = new IO::File $keyfile, 'r'
      or croak "Can't open $keyfile for reading: $OS_ERROR";
    my $data = slurp $fh;
    my $plaintext = $cipher->decrypt($data);
    for (split /\n/, $plaintext) {
      my ($k, $v) = split /\t/;
      $self->{$k} = $v;
    }
    $fh->close;
  }

  if (defined $options->{fallback}) {
    my $fallback_class = 'Finance::Bank::Cahoot::CredentialsProvider::'.$options->{fallback};
    eval "use $fallback_class"; ## no critic
    croak 'Invalid fallback provider '.$options->{fallback} if $EVAL_ERROR;

    my $fallback_args = { credentials => $self->{_credentials},
			  options => $options->{fallback_options} };
    eval "\$self->{_fallback} = $fallback_class->new(\%{\$fallback_args})"; ## no critic
    croak 'Fallback provider '.$options->{fallback}.' failed to initialise' if $EVAL_ERROR;
  }

  my $do_update = 0;
  foreach my $credential (@{$self->{_credentials}}) {
    if (not defined $self->{$credential}) {
      croak 'No fallback provider given and '.$credential.' is not in keyfile'
	if not defined $self->{_fallback};
      $self->{$credential} = $self->{_fallback}->$credential;
      $do_update = 1;
    }
  }

  if ($do_update) {
    my $fh = new IO::File $keyfile, 'w'
      or croak "Can't open $keyfile for writing: $OS_ERROR";

    my @ciphers;
    foreach my $credential (@{$self->{_credentials}}) {
      push @ciphers, $credential."\t".$self->{$credential};
    }
    my $ciphertext = $cipher->encrypt(join "\n", @ciphers);
    $fh->print($ciphertext);
    $fh->close;
  }
  return $self;
}

sub get
{
  my ($self, $credential, $offset) = @_;
  return substr $self->{$credential}, $offset, 1
    if defined $offset;
  return $self->{$credential};
}