added StripSecretInArgs in pkg/util

pkg/util/stripsecrets.go

@@ -0,0 +1,76 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+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 util
+
+import (
+	"strings"
+)
+
+const (
+	keyArg              = "--key="
+	secretArg           = "secret="
+	optionsArgSeparator = ','
+	strippedKey         = "--key=***stripped***"
+	strippedSecret      = "secret=***stripped***"
+)
+
+// StripSecretInArgs strips values of either "--key" or "secret=".
+// `args` is left unchanged.
+// Expects only one occurrence of either "--key" or "secret=".
+func StripSecretInArgs(args []string) []string {
+	out := make([]string, len(args))
+	copy(out, args)
+
+	if !stripKey(out) {
+		stripSecret(out)
+	}
+
+	return out
+}
+
+func stripKey(out []string) bool {
+	for i := range out {
+		if strings.HasPrefix(out[i], keyArg) {
+			out[i] = strippedKey
+			return true
+		}
+	}
+
+	return false
+}
+
+func stripSecret(out []string) bool {
+	for i := range out {
+		arg := out[i]
+		begin := strings.Index(arg, secretArg)
+
+		if begin == -1 {
+			continue
+		}
+
+		end := strings.IndexByte(arg[begin+len(secretArg):], optionsArgSeparator)
+
+		out[i] = arg[:begin] + strippedSecret
+		if end != -1 {
+			out[i] += arg[end+len(secretArg):]
+		}
+
+		return true
+	}
+
+	return false
+}