Add cloudstorage support

For now Openstack Swift is supported. But it should be pretty easy to
implement other Swift / S3 like object storages.

1 files changed, 28 insertions, 4 deletions

diff --git a/gpg/gpg.go b/gpg/gpg.go
index 4639ae2..1ab71ec 100644
--- a/gpg/gpg.go
+++ b/gpg/gpg.go
@@ -12,10 +12,7 @@ type Signer struct {
 	Key string
 }
 
-// Sign signs a message b with the key s.Key
-func (s Signer) Sign(b []byte) ([]byte, error) {
-	cmd := exec.Command("gpg", "--clearsign", "-u", s.Key)
-
+func filter(cmd *exec.Cmd, b []byte) ([]byte, error) {
 	cmd.Stdin = bytes.NewReader(b)
 	var out bytes.Buffer
 	cmd.Stdout = &out
@@ -24,6 +21,12 @@ func (s Signer) Sign(b []byte) ([]byte, error) {
 	return out.Bytes(), err
 }
 
+// Sign signs a message b with the key s.Key
+func (s Signer) Sign(b []byte) ([]byte, error) {
+	cmd := exec.Command("gpg", "--clearsign", "-u", s.Key)
+	return filter(cmd, b)
+}
+
 // Verifyer implements objects.Verifyer using gpg
 type Verifyer struct{}
 
@@ -33,3 +36,24 @@ func (Verifyer) Verify(b []byte) error {
 	cmd.Stdin = bytes.NewReader(b)
 	return cmd.Run()
 }
+
+type Encrypter struct {
+	Key string
+}
+
+func (e Encrypter) Encrypt(b []byte) ([]byte, error) {
+	cmd := exec.Command("gpg", "--encrypt", "--recipient", e.Key)
+	return filter(cmd, b)
+}
+
+type Decrypter struct{}
+
+func (Decrypter) Decrypt(b []byte) ([]byte, error) {
+	cmd := exec.Command("gpg", "--decrypt")
+	return filter(cmd, b)
+}
+
+type Crypter struct {
+	Encrypter
+	Decrypter
+}