1 files changed, 146 insertions, 0 deletions
diff --git a/scripts/Dpkg/OpenPGP/Backend.pm b/scripts/Dpkg/OpenPGP/Backend.pm
new file mode 100644
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+++ b/scripts/Dpkg/OpenPGP/Backend.pm
@@ -0,0 +1,146 @@
+# Copyright © 2017, 2022 Guillem Jover <guillem@debian.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+=encoding utf8
+
+=head1 NAME
+
+Dpkg::OpenPGP::Backend - OpenPGP backend base class
+
+=head1 DESCRIPTION
+
+This module provides an OpenPGP backend base class that specific
+implementations should inherit from.
+
+B<Note>: This is a private module, its API can change at any time.
+
+=cut
+
+package Dpkg::OpenPGP::Backend 0.01;
+
+use strict;
+use warnings;
+
+use List::Util qw(first);
+
+use Dpkg::Path qw(find_command);
+use Dpkg::OpenPGP::ErrorCodes;
+
+sub DEFAULT_CMDV {
+    return [];
+}
+
+sub DEFAULT_CMDSTORE {
+    return [];
+}
+
+sub DEFAULT_CMD {
+    return [];
+}
+
+sub _detect_cmd {
+    my ($cmd, $default) = @_;
+
+    if (! defined $cmd || $cmd eq 'auto') {
+        return first { find_command($_) } @{$default};
+    } else {
+        return find_command($cmd);
+    }
+}
+
+sub new {
+    my ($this, %opts) = @_;
+    my $class = ref($this) || $this;
+
+    my $self = {};
+    bless $self, $class;
+
+    $self->{cmdv} = _detect_cmd($opts{cmdv}, $self->DEFAULT_CMDV());
+    $self->{cmdstore} = _detect_cmd($opts{cmdstore}, $self->DEFAULT_CMDSTORE());
+    $self->{cmd} = _detect_cmd($opts{cmd}, $self->DEFAULT_CMD());
+
+    return $self;
+}
+
+sub has_backend_cmd {
+    my $self = shift;
+
+    return defined $self->{cmd};
+}
+
+sub has_verify_cmd {
+    my $self = shift;
+
+    return defined $self->{cmd};
+}
+
+sub has_keystore {
+    my $self = shift;
+
+    return 0;
+}
+
+sub can_use_key {
+    my ($self, $key) = @_;
+
+    return $self->has_keystore() if $key->needs_keystore();
+    return 1;
+}
+
+sub get_trusted_keyrings {
+    my $self = shift;
+
+    return ();
+}
+
+sub armor {
+    my ($self, $type, $in, $out) = @_;
+
+    return OPENPGP_UNSUPPORTED_SUBCMD;
+}
+
+sub dearmor {
+    my ($self, $type, $in, $out) = @_;
+
+    return OPENPGP_UNSUPPORTED_SUBCMD;
+}
+
+sub inline_verify {
+    my ($self, $inlinesigned, $data, @certs) = @_;
+
+    return OPENPGP_UNSUPPORTED_SUBCMD;
+}
+
+sub verify {
+    my ($self, $data, $sig, @certs) = @_;
+
+    return OPENPGP_UNSUPPORTED_SUBCMD;
+}
+
+sub inline_sign {
+    my ($self, $data, $inlinesigned, $key) = @_;
+
+    return OPENPGP_UNSUPPORTED_SUBCMD;
+}
+
+=head1 CHANGES
+
+=head2 Version 0.xx
+
+This is a private module.
+
+=cut
+
+1;