feat: add gpg integration

This commit adds gpg system integration. This is done through two new
packages: gpgbin, which handles the system calls and parsing; and gpg
which is mostly a copy of emersion/go-pgpmail with modifications to
interface with package gpgbin. gpg includes tests for many cases, and
by it's nature also tests package gpgbin. I separated these in case an
external dependency is ever used for the gpg sys-calls/parsing (IE we
mirror how go-pgpmail+openpgp currently are dependencies)

Two new config options are introduced:
* pgp-provider. If it is not explicitly set to "gpg", aerc will default to
it's internal pgp provider
* pgp-key-id: (Optionally) specify a key by short or long keyId

Signed-off-by: Tim Culverhouse <tim@timculverhouse.com>
Acked-by: Koni Marti <koni.marti@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>

1 files changed, 16 insertions, 0 deletions

diff --git a/lib/crypto/gpg/gpgbin/import.go b/lib/crypto/gpg/gpgbin/import.go
new file mode 100644
index 00000000..49e178b5
--- /dev/null
+++ b/lib/crypto/gpg/gpgbin/import.go
@@ -0,0 +1,16 @@
+package gpgbin
+
+import (
+	"io"
+)
+
+// Import runs gpg --import and thus imports both private and public keys
+func Import(r io.Reader) error {
+	args := []string{"--import"}
+	g := newGpg(r, args)
+	err := g.cmd.Run()
+	if err != nil {
+		return err
+	}
+	return nil
+}