From b2742dc28d1ff9001cd784455bbdf9cf29539c30 Mon Sep 17 00:00:00 2001
From: Laria Carolin Chabowski <laria@laria.me>
Date: Thu, 14 Sep 2017 07:42:50 +0200
Subject: Implement remaining subcommands

---
 objects/id.go              | 10 ++++++++--
 objects/object_snapshot.go | 17 +++++++++++++++++
 2 files changed, 25 insertions(+), 2 deletions(-)

(limited to 'objects')

diff --git a/objects/id.go b/objects/id.go
index 224b3cd..047fada 100644
--- a/objects/id.go
+++ b/objects/id.go
@@ -39,7 +39,7 @@ type ObjectId struct {
 	Sum  []byte
 }
 
-func (oid ObjectId) wellformed() bool {
+func (oid ObjectId) Wellformed() bool {
 	return oid.Algo.checkAlgo() && len(oid.Sum) == oid.Algo.sumLength()
 }
 
@@ -61,13 +61,19 @@ func ParseObjectId(s string) (oid ObjectId, err error) {
 		return
 	}
 
-	if !oid.wellformed() {
+	if !oid.Wellformed() {
 		err = errors.New("Object ID is malformed")
 	}
 
 	return
 }
 
+// Set implements flag.Value for ObjectId
+func (oid *ObjectId) Set(s string) (err error) {
+	*oid, err = ParseObjectId(s)
+	return
+}
+
 func MustParseObjectId(s string) ObjectId {
 	id, err := ParseObjectId(s)
 	if err != nil {
diff --git a/objects/object_snapshot.go b/objects/object_snapshot.go
index 7edbc2a..e86484d 100644
--- a/objects/object_snapshot.go
+++ b/objects/object_snapshot.go
@@ -23,6 +23,7 @@ type Snapshot struct {
 	Archive string
 	Comment string
 	Signed  bool
+	raw     []byte
 }
 
 func (s Snapshot) Type() ObjectType {
@@ -62,6 +63,20 @@ func (s Snapshot) Payload() (out []byte) {
 	return out
 }
 
+type Verifyer interface {
+	Verify([]byte) error
+}
+
+// Verify verifies that the snapshot has a valid signature.
+// Only works with unserialized snapshots, i.e. a freshly created snapshot can not be verified.
+func (s Snapshot) Verify(v Verifyer) error {
+	if !s.Signed {
+		return nil
+	}
+
+	return v.Verify(s.raw)
+}
+
 type Signer interface {
 	Sign([]byte) ([]byte, error)
 }
@@ -73,6 +88,8 @@ func (s Snapshot) SignedPayload(signer Signer) ([]byte, error) {
 func (s *Snapshot) FromPayload(payload []byte) error {
 	r := bytes.NewBuffer(payload)
 
+	s.raw = payload
+
 	seenArchive := false
 	seenDate := false
 	seenTree := false
-- 
cgit v1.2.3-54-g00ecf