secretservice: add D-Bus secret service

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

secretservice/secretservice_linux.go

@@ -0,0 +1,84 @@
+package secretservice
+
+/*
+#cgo pkg-config: libsecret-1
+
+#include "secretservice_linux.h"
+#include <stdlib.h>
+*/
+import "C"
+import (
+	"errors"
+	"unsafe"
+
+	"github.com/docker/docker-credential-helpers/credentials"
+)
+
+type secretservice struct{}
+
+// New creates a new secretservice.
+func New() credentials.Helper {
+	return secretservice{}
+}
+
+// Add adds new credentials to the keychain.
+func (h secretservice) Add(creds *credentials.Credentials) error {
+	if creds == nil {
+		return errors.New("missing credentials")
+	}
+	server := C.CString(creds.ServerURL)
+	defer C.free(unsafe.Pointer(server))
+	username := C.CString(creds.Username)
+	defer C.free(unsafe.Pointer(username))
+	password := C.CString(creds.Password)
+	defer C.free(unsafe.Pointer(password))
+
+	if err := C.add(server, username, password); err != nil {
+		defer C.g_error_free(err)
+		errMsg := (*C.char)(unsafe.Pointer(err.message))
+		return errors.New(C.GoString(errMsg))
+	}
+	return nil
+}
+
+// Delete removes credentials from the keychain.
+func (h secretservice) Delete(serverURL string) error {
+	if serverURL == "" {
+		return errors.New("missing server url")
+	}
+	server := C.CString(serverURL)
+	defer C.free(unsafe.Pointer(server))
+
+	if err := C.delete(server); err != nil {
+		defer C.g_error_free(err)
+		errMsg := (*C.char)(unsafe.Pointer(err.message))
+		return errors.New(C.GoString(errMsg))
+	}
+	return nil
+}
+
+// Get returns the username and password to use for a given registry server URL.
+func (h secretservice) Get(serverURL string) (string, string, error) {
+	if serverURL == "" {
+		return "", "", errors.New("missing server url")
+	}
+	var username *C.char
+	defer C.free(unsafe.Pointer(username))
+	var password *C.char
+	defer C.free(unsafe.Pointer(password))
+	server := C.CString(serverURL)
+	defer C.free(unsafe.Pointer(server))
+
+	err := C.get(server, &username, &password)
+	if err != nil {
+		defer C.g_error_free(err)
+		errMsg := (*C.char)(unsafe.Pointer(err.message))
+		return "", "", errors.New(C.GoString(errMsg))
+	}
+	user := C.GoString(username)
+	pass := C.GoString(password)
+	if pass == "" {
+		return "", "", credentials.ErrCredentialsNotFound
+	}
+	return user, pass, nil
+}