init: pristine aerc 0.20.0 source

lib/crypto/gpg/gpgbin/keys.go

@@ -0,0 +1,48 @@
+package gpgbin
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os/exec"
+	"strings"
+)
+
+// GetPrivateKeyId runs gpg --list-secret-keys s
+func GetPrivateKeyId(s string) (string, error) {
+	private := true
+	id := getKeyId(s, private)
+	if id == "" {
+		return "", fmt.Errorf("no private key found")
+	}
+	return id, nil
+}
+
+// GetKeyId runs gpg --list-keys s
+func GetKeyId(s string) (string, error) {
+	private := false
+	id := getKeyId(s, private)
+	if id == "" {
+		return "", fmt.Errorf("no public key found")
+	}
+	return id, nil
+}
+
+// ExportPublicKey exports the public key identified by k in armor format
+func ExportPublicKey(k string) (io.Reader, error) {
+	cmd := exec.Command("gpg", "--armor",
+		"--export-options", "export-minimal", "--export", k)
+
+	var outbuf bytes.Buffer
+	var stderr strings.Builder
+	cmd.Stdout = &outbuf
+	cmd.Stderr = &stderr
+	err := cmd.Run()
+	if err != nil {
+		return nil, fmt.Errorf("gpg: export failed: %w", err)
+	}
+	if strings.Contains(stderr.String(), "gpg") {
+		return nil, fmt.Errorf("gpg: error exporting key")
+	}
+	return &outbuf, nil
+}