config: forbid unknown YAML configuration fields

Close #3128 and fix one of the privnet configurations along the way.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

config/protocol.privnet.docker.one.yml

@@ -80,7 +80,8 @@ ApplicationConfiguration:
       - ":20001"
   Pprof:
     Enabled: false
-    Port: 20011
+    Addresses:
+      - ":20011"
   Consensus:
     Enabled: true
     UnlockWallet:

pkg/config/config.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"bytes"
 	"fmt"
 	"os"
 	"time"
@@ -82,8 +83,9 @@ func LoadFile(configPath string) (Config, error) {
 			},
 		},
 	}
-
-	err = yaml.Unmarshal(configData, &config)
+	decoder := yaml.NewDecoder(bytes.NewReader(configData))
+	decoder.KnownFields(true)
+	err = decoder.Decode(&config)
 	if err != nil {
 		return Config{}, fmt.Errorf("failed to unmarshal config YAML: %w", err)
 	}

pkg/config/config_test.go

@@ -1,8 +1,11 @@
 package config
 
 import (
+	"os"
+	"path/filepath"
 	"testing"
 
+	"github.com/nspcc-dev/neo-go/pkg/config/netmode"
 	"github.com/stretchr/testify/require"
 )
 
@@ -12,3 +15,20 @@ func TestUnexpectedNativeUpdateHistoryContract(t *testing.T) {
 	_, err := LoadFile(testConfigPath)
 	require.Error(t, err)
 }
+
+func TestUnknownConfigFields(t *testing.T) {
+	tmp := t.TempDir()
+	cfg := filepath.Join(tmp, "protocol.testnet.yml")
+	require.NoError(t, os.WriteFile(cfg, []byte(`UnknownConfigurationField: 123`), os.ModePerm))
+
+	t.Run("LoadFile", func(t *testing.T) {
+		_, err := LoadFile(cfg)
+		require.Error(t, err)
+		require.Contains(t, err.Error(), "field UnknownConfigurationField not found in type config.Config")
+	})
+	t.Run("Load", func(t *testing.T) {
+		_, err := Load(tmp, netmode.TestNet)
+		require.Error(t, err)
+		require.Contains(t, err.Error(), "field UnknownConfigurationField not found in type config.Config")
+	})
+}