server/eth: Implement ValidateSecret.

server/asset/eth/eth.go

@@ -7,7 +7,9 @@
 package eth
 
 import (
+	"bytes"
 	"context"
+	"crypto/sha256"
 	"errors"
 	"fmt"
 	"math/big"
@@ -265,9 +267,10 @@ func (eth *Backend) Contract(coinID, _ []byte) (*asset.Contract, error) {
 	}, nil
 }
 
-// ValidateSecret checks that the secret satisfies the contract.
-func (eth *Backend) ValidateSecret(secret, contract []byte) bool {
-	return false
+// ValidateSecret checks that the secret satisfies the secret hash.
+func (eth *Backend) ValidateSecret(secret, secretHash []byte) bool {
+	sh := sha256.Sum256(secret)
+	return bytes.Equal(sh[:], secretHash)
 }
 
 // Synced is true if the blockchain is ready for action.

server/asset/eth/eth_test.go

@@ -8,6 +8,7 @@ package eth
 import (
 	"bytes"
 	"context"
+	"crypto/sha256"
 	"encoding/binary"
 	"encoding/hex"
 	"errors"
@@ -527,3 +528,30 @@ func TestContract(t *testing.T) {
 		}
 	}
 }
+
+func TestValidateSecret(t *testing.T) {
+	secret, blankHash := make([]byte, 32), make([]byte, 32)
+	copy(secret[:], encode.RandomBytes(32))
+	secretHash := sha256.Sum256(secret[:])
+	tests := []struct {
+		name       string
+		secretHash []byte
+		want       bool
+	}{{
+		name:       "ok",
+		secretHash: secretHash[:],
+		want:       true,
+	}, {
+		name:       "not the right hash",
+		secretHash: blankHash,
+	}}
+	for _, test := range tests {
+		eth := &Backend{
+			log: tLogger,
+		}
+		got := eth.ValidateSecret(secret, test.secretHash)
+		if test.want != got {
+			t.Fatalf("expected %v but got %v for test %q", test.want, got, test.name)
+		}
+	}
+}