1 files changed, 110 insertions, 0 deletions
diff --git a/signer/core/auditlog.go b/signer/core/auditlog.go
new file mode 100644
index 000000000..d0ba733d2
--- /dev/null
+++ b/signer/core/auditlog.go
@@ -0,0 +1,110 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"context"
+
+	"encoding/json"
+
+	"github.com/ethereum/go-ethereum/accounts"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/internal/ethapi"
+	"github.com/ethereum/go-ethereum/log"
+)
+
+type AuditLogger struct {
+	log log.Logger
+	api ExternalAPI
+}
+
+func (l *AuditLogger) List(ctx context.Context) (Accounts, error) {
+	l.log.Info("List", "type", "request", "metadata", MetadataFromContext(ctx).String())
+	res, e := l.api.List(ctx)
+
+	l.log.Info("List", "type", "response", "data", res.String())
+
+	return res, e
+}
+
+func (l *AuditLogger) New(ctx context.Context) (accounts.Account, error) {
+	return l.api.New(ctx)
+}
+
+func (l *AuditLogger) SignTransaction(ctx context.Context, args SendTxArgs, methodSelector *string) (*ethapi.SignTransactionResult, error) {
+	sel := "<nil>"
+	if methodSelector != nil {
+		sel = *methodSelector
+	}
+	l.log.Info("SignTransaction", "type", "request", "metadata", MetadataFromContext(ctx).String(),
+		"tx", args.String(),
+		"methodSelector", sel)
+
+	res, e := l.api.SignTransaction(ctx, args, methodSelector)
+	if res != nil {
+		l.log.Info("SignTransaction", "type", "response", "data", common.Bytes2Hex(res.Raw), "error", e)
+	} else {
+		l.log.Info("SignTransaction", "type", "response", "data", res, "error", e)
+	}
+	return res, e
+}
+
+func (l *AuditLogger) Sign(ctx context.Context, addr common.MixedcaseAddress, data hexutil.Bytes) (hexutil.Bytes, error) {
+	l.log.Info("Sign", "type", "request", "metadata", MetadataFromContext(ctx).String(),
+		"addr", addr.String(), "data", common.Bytes2Hex(data))
+	b, e := l.api.Sign(ctx, addr, data)
+	l.log.Info("Sign", "type", "response", "data", common.Bytes2Hex(b), "error", e)
+	return b, e
+}
+
+func (l *AuditLogger) EcRecover(ctx context.Context, data, sig hexutil.Bytes) (common.Address, error) {
+	l.log.Info("EcRecover", "type", "request", "metadata", MetadataFromContext(ctx).String(),
+		"data", common.Bytes2Hex(data))
+	a, e := l.api.EcRecover(ctx, data, sig)
+	l.log.Info("EcRecover", "type", "response", "addr", a.String(), "error", e)
+	return a, e
+}
+
+func (l *AuditLogger) Export(ctx context.Context, addr common.Address) (json.RawMessage, error) {
+	l.log.Info("Export", "type", "request", "metadata", MetadataFromContext(ctx).String(),
+		"addr", addr.Hex())
+	j, e := l.api.Export(ctx, addr)
+	// In this case, we don't actually log the json-response, which may be extra sensitive
+	l.log.Info("Export", "type", "response", "json response size", len(j), "error", e)
+	return j, e
+}
+
+func (l *AuditLogger) Import(ctx context.Context, keyJSON json.RawMessage) (Account, error) {
+	// Don't actually log the json contents
+	l.log.Info("Import", "type", "request", "metadata", MetadataFromContext(ctx).String(),
+		"keyJSON size", len(keyJSON))
+	a, e := l.api.Import(ctx, keyJSON)
+	l.log.Info("Import", "type", "response", "addr", a.String(), "error", e)
+	return a, e
+}
+
+func NewAuditLogger(path string, api ExternalAPI) (*AuditLogger, error) {
+	l := log.New("api", "signer")
+	handler, err := log.FileHandler(path, log.LogfmtFormat())
+	if err != nil {
+		return nil, err
+	}
+	l.SetHandler(handler)
+	l.Info("Configured", "audit log", path)
+	return &AuditLogger{l, api}, nil
+}