[#119] frostfsid: Add 'getSubjectKV'

Signed-off-by: Alexander Chuprov <a.chuprov@yadro.com>

frostfsid/client/client.go

@@ -96,6 +96,7 @@ const (
 	createSubjectMethod       = "createSubject"
 	getSubjectMethod          = "getSubject"
 	getSubjectExtendedMethod  = "getSubjectExtended"
+	getSubjectKVMethod        = "getSubjectKV"
 	listSubjectsMethod        = "listSubjects"
 	addSubjectKeyMethod       = "addSubjectKey"
 	removeSubjectKeyMethod    = "removeSubjectKey"
@@ -266,6 +267,16 @@ func (c Client) GetSubjectExtended(addr util.Uint160) (*SubjectExtended, error)
 	return ParseSubjectExtended(items)
 }
 
+// GetSubjectKV invokes `getSubjectKV` method of contract.
+func (c Client) GetSubjectKV(addr util.Uint160, name string) (string, error) {
+	value, err := unwrap.UTF8String(c.act.Call(c.contract, getSubjectKVMethod, addr, name))
+	if err != nil {
+		return "", err
+	}
+
+	return value, nil
+}
+
 // ListSubjects gets all subjects.
 func (c Client) ListSubjects() ([]util.Uint160, error) {
 	return UnwrapArrayOfUint160(commonclient.ReadIteratorItems(c.act, iteratorBatchSize, c.contract, listSubjectsMethod))

frostfsid/config.yml

@@ -7,6 +7,7 @@ safemethods:
   - "getGroupByName"
   - "getNamespace"
   - "getNamespaceExtended"
+  - "getSubjectKV"
   - "getSubject"
   - "getSubjectExtended"
   - "getSubjectByKey"

frostfsid/frostfsid_contract.go

@@ -472,6 +472,34 @@ func GetSubjectKeyByName(ns, name string) interop.PublicKey {
 	return subjKey
 }
 
+// GetSubjectKV GetSubjectKey returns the value associated with the key for the subject.
+func GetSubjectKV(addr interop.Hash160, name string) string {
+	if len(addr) != interop.Hash160Len {
+		panic("incorrect address length")
+	}
+
+	ctx := storage.GetReadOnlyContext()
+	sKey := subjectKeyFromAddr(addr)
+	data := storage.Get(ctx, sKey).([]byte)
+	if data == nil {
+		return ""
+	}
+
+	sbj := std.Deserialize(data).(Subject)
+
+	if sbj.KV == nil {
+		return ""
+	}
+
+	for k, v := range sbj.KV {
+		if k == name {
+			return v
+		}
+	}
+
+	return ""
+}
+
 func ListSubjects() iterator.Iterator {
 	ctx := storage.GetReadOnlyContext()
 	return storage.Find(ctx, []byte{subjectKeysPrefix}, storage.KeysOnly|storage.RemovePrefix)

rpcclient/frostfsid/client.go

@@ -222,6 +222,11 @@ func (c *ContractReader) GetSubjectExtended(addr util.Uint160) ([]stackitem.Item
 	return unwrap.Array(c.invoker.Call(c.hash, "getSubjectExtended", addr))
 }
 
+// GetSubjectKV invokes `getSubjectKV` method of contract.
+func (c *ContractReader) GetSubjectKV(addr util.Uint160, name string) (string, error) {
+	return unwrap.UTF8String(c.invoker.Call(c.hash, "getSubjectKV", addr, name))
+}
+
 // GetSubjectKeyByName invokes `getSubjectKeyByName` method of contract.
 func (c *ContractReader) GetSubjectKeyByName(ns string, name string) (*keys.PublicKey, error) {
 	return unwrap.PublicKey(c.invoker.Call(c.hash, "getSubjectKeyByName", ns, name))