vendor: revendor

vendor/k8s.io/component-base/logs/datapol/datapol.go

@@ -0,0 +1,99 @@
+/*
+Copyright 2020 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 datapol contains functions to determine if objects contain sensitive
+// data to e.g. make decisions on whether to log them or not.
+package datapol
+
+import (
+	"reflect"
+	"strings"
+
+	"k8s.io/klog/v2"
+)
+
+// Verify returns a list of the datatypes contained in the argument that can be
+// considered sensitive w.r.t. to logging
+func Verify(value interface{}) []string {
+	defer func() {
+		if r := recover(); r != nil {
+			//TODO maybe export a metric
+			klog.Warningf("Error while inspecting arguments for sensitive data: %v", r)
+		}
+	}()
+	t := reflect.ValueOf(value)
+	if t.Kind() == reflect.Ptr {
+		t = t.Elem()
+	}
+	return datatypes(t)
+}
+
+func datatypes(v reflect.Value) []string {
+	if types := byType(v.Type()); len(types) > 0 {
+		// Slices, and maps can be nil or empty, only the nil case is zero
+		switch v.Kind() {
+		case reflect.Slice, reflect.Map:
+			if !v.IsZero() && v.Len() > 0 {
+				return types
+			}
+		default:
+			if !v.IsZero() {
+				return types
+			}
+		}
+	}
+	switch v.Kind() {
+	case reflect.Interface:
+		return datatypes(v.Elem())
+	case reflect.Slice, reflect.Array:
+		for i := 0; i < v.Len(); i++ {
+			if types := datatypes(v.Index(i)); len(types) > 0 {
+				return types
+			}
+		}
+	case reflect.Map:
+		mapIter := v.MapRange()
+		for mapIter.Next() {
+			k := mapIter.Key()
+			v := mapIter.Value()
+			if types := datatypes(k); len(types) > 0 {
+				return types
+			}
+			if types := datatypes(v); len(types) > 0 {
+				return types
+			}
+		}
+	case reflect.Struct:
+		t := v.Type()
+		numField := t.NumField()
+
+		for i := 0; i < numField; i++ {
+			f := t.Field(i)
+			if f.Type.Kind() == reflect.Ptr {
+				continue
+			}
+			if reason, ok := f.Tag.Lookup("datapolicy"); ok {
+				if !v.Field(i).IsZero() {
+					return strings.Split(reason, ",")
+				}
+			}
+			if types := datatypes(v.Field(i)); len(types) > 0 {
+				return types
+			}
+		}
+	}
+	return nil
+}