class GPGME::Signature

def bad?
  status_code == GPGME::GPG_ERR_BAD_SIGNATURE
end

def exp_timestamp
  Time.at(@exp_timestamp)
end

def expired_key?
  status_code == GPGME::GPG_ERR_KEY_EXPIRED
end

def expired_signature?
  status_code == GPGME::GPG_ERR_SIG_EXPIRED
end

def from
  @from ||= begin
    Ctx.new do |ctx|
      if from_key = ctx.get_key(fingerprint)
        "#{from_key.subkeys[0].keyid} #{from_key.uids[0].uid}"
      else
        fingerprint
      end
    end
  end
end

def key
  @key ||= begin
    Ctx.new do |ctx|
      @key = ctx.get_key(fingerprint)
    end
  end
end

def no_key?
  status_code == GPGME::GPG_ERR_NO_PUBKEY
end

def revoked_key?
  status_code == GPGME::GPG_ERR_CERT_REVOKED
end

def status_code
  GPGME::gpgme_err_code(status)
end

def timestamp
  Time.at(@timestamp)
end

def to_s
  case status_code
  when GPGME::GPG_ERR_NO_ERROR
    "Good signature from #{from}"
  when GPGME::GPG_ERR_SIG_EXPIRED
    "Expired signature from #{from}"
  when GPGME::GPG_ERR_KEY_EXPIRED
    "Signature made from expired key #{from}"
  when GPGME::GPG_ERR_CERT_REVOKED
    "Signature made from revoked key #{from}"
  when GPGME::GPG_ERR_BAD_SIGNATURE
    "Bad signature from #{from}"
  when GPGME::GPG_ERR_NO_PUBKEY
    "No public key for #{from}"
  end
end

def valid?
  status_code == GPGME::GPG_ERR_NO_ERROR
end