refactor(ledger): move stakecredential functions to its own file (#652)

Signed-off-by: Chris Gianelloni <wolf31o2@blinklabs.io>

ledger/certs.go

@@ -117,33 +117,6 @@ type Certificate interface {
 	Utxorpc() *utxorpc.Certificate
 }
 
-const (
-	StakeCredentialTypeAddrKeyHash = 0
-	StakeCredentialTypeScriptHash  = 1
-)
-
-type StakeCredential struct {
-	cbor.StructAsArray
-	cbor.DecodeStoreCbor
-	CredType   uint
-	Credential []byte
-}
-
-func (c *StakeCredential) Utxorpc() *utxorpc.StakeCredential {
-	ret := &utxorpc.StakeCredential{}
-	switch c.CredType {
-	case StakeCredentialTypeAddrKeyHash:
-		ret.StakeCredential = &utxorpc.StakeCredential_AddrKeyHash{
-			AddrKeyHash: c.Credential[:],
-		}
-	case StakeCredentialTypeScriptHash:
-		ret.StakeCredential = &utxorpc.StakeCredential_ScriptHash{
-			ScriptHash: c.Credential[:],
-		}
-	}
-	return ret
-}
-
 const (
 	DrepTypeAddrKeyHash  = 0
 	DrepTypeScriptHash   = 1

ledger/credentials.go

@@ -0,0 +1,67 @@
+// Copyright 2024 Blink Labs Software
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ledger
+
+import (
+	"fmt"
+
+	"github.com/blinklabs-io/gouroboros/cbor"
+
+	utxorpc "github.com/utxorpc/go-codegen/utxorpc/v1alpha/cardano"
+	"golang.org/x/crypto/blake2b"
+)
+
+const (
+	StakeCredentialTypeAddrKeyHash = 0
+	StakeCredentialTypeScriptHash  = 1
+)
+
+type StakeCredential struct {
+	cbor.StructAsArray
+	cbor.DecodeStoreCbor
+	CredType   uint
+	Credential []byte
+}
+
+func (c *StakeCredential) Hash() Blake2b224 {
+	hash, err := blake2b.New(28, nil)
+	if err != nil {
+		panic(
+			fmt.Sprintf(
+				"unexpected error creating empty blake2b hash: %s",
+				err,
+			),
+		)
+	}
+	if c != nil {
+		hash.Write(c.Credential[:])
+	}
+	return Blake2b224(hash.Sum(nil))
+}
+
+func (c *StakeCredential) Utxorpc() *utxorpc.StakeCredential {
+	ret := &utxorpc.StakeCredential{}
+	switch c.CredType {
+	case StakeCredentialTypeAddrKeyHash:
+		ret.StakeCredential = &utxorpc.StakeCredential_AddrKeyHash{
+			AddrKeyHash: c.Credential[:],
+		}
+	case StakeCredentialTypeScriptHash:
+		ret.StakeCredential = &utxorpc.StakeCredential_ScriptHash{
+			ScriptHash: c.Credential[:],
+		}
+	}
+	return ret
+}