1 files changed, 108 insertions, 0 deletions
diff --git a/scripts/Dpkg/OpenPGP/Backend/SOP.pm b/scripts/Dpkg/OpenPGP/Backend/SOP.pm
new file mode 100644
index 0000000..1c5073b
--- /dev/null
+++ b/scripts/Dpkg/OpenPGP/Backend/SOP.pm
@@ -0,0 +1,108 @@
+# Copyright © 2021-2022 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/>.
+
+package Dpkg::OpenPGP::Backend::SOP;
+
+use strict;
+use warnings;
+
+our $VERSION = '0.01';
+
+use POSIX qw(:sys_wait_h);
+
+use Dpkg::ErrorHandling;
+use Dpkg::IPC;
+use Dpkg::OpenPGP::ErrorCodes;
+
+use parent qw(Dpkg::OpenPGP::Backend);
+
+# - Once "gosop" implements inline-verify and inline-sign, add as alternative.
+#   Ref: https://github.com/ProtonMail/gosop/issues/6
+# - Once "hop" implements the new SOP draft, add as alternative.
+#   Ref: https://salsa.debian.org/clint/hopenpgp-tools/-/issues/4
+# - Once the SOP MR !23 is finalized and merged, implement a way to select
+#   whether the SOP instance supports the expected draft.
+#   Ref: https://gitlab.com/dkg/openpgp-stateless-cli/-/merge_requests/23
+# - Once the SOP issue #42 is resolved we can perhaps remove the alternative
+#   dependencies and commands to check?
+#   Ref: https://gitlab.com/dkg/openpgp-stateless-cli/-/issues/42
+
+sub DEFAULT_CMD {
+    return [ qw(sqop pgpainless-cli) ];
+}
+
+sub _sop_exec
+{
+    my ($self, $io, @exec) = @_;
+
+    return OPENPGP_MISSING_CMD unless $self->{cmd};
+
+    $io->{out} //= '/dev/null';
+    my $stderr;
+    spawn(exec => [ $self->{cmd}, @exec ],
+          wait_child => 1, nocheck => 1, timeout => 10,
+          from_file => $io->{in}, to_file => $io->{out},
+          error_to_string => \$stderr);
+    if (WIFEXITED($?)) {
+        my $status = WEXITSTATUS($?);
+        print { *STDERR } "$stderr" if $status;
+        return $status;
+    } else {
+        subprocerr("$self->{cmd} @exec");
+    }
+}
+
+sub armor
+{
+    my ($self, $type, $in, $out) = @_;
+
+    # We ignore the $type, and let "sop" handle this automatically.
+    return $self->_sop_exec({ in => $in, out => $out }, 'armor');
+}
+
+sub dearmor
+{
+    my ($self, $type, $in, $out) = @_;
+
+    # We ignore the $type, and let "sop" handle this automatically.
+    return $self->_sop_exec({ in => $in, out => $out }, 'dearmor');
+}
+
+sub inline_verify
+{
+    my ($self, $inlinesigned, $data, @certs) = @_;
+
+    return $self->_sop_exec({ in => $inlinesigned, out => $data },
+                            'inline-verify', @certs);
+}
+
+sub verify
+{
+    my ($self, $data, $sig, @certs) = @_;
+
+    return $self->_sop_exec({ in => $data }, 'verify', $sig, @certs);
+}
+
+sub inline_sign
+{
+    my ($self, $data, $inlinesigned, $key) = @_;
+
+    return OPENPGP_NEEDS_KEYSTORE if $key->needs_keystore();
+
+    return $self->_sop_exec({ in => $data, out => $inlinesigned },
+                            qw(inline-sign --as clearsigned --), $key->handle);
+}
+
+1;