rebase: add replication-lib-utils to go.mod

added github.com/kube-storage/replication-lib-utils
to the vendor directory which is required to avoid
secret logging in GRPC.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

vendor/github.com/google/go-cmp/cmp/compare.go

@@ -1,6 +1,6 @@
 // Copyright 2017, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 // Package cmp determines equality of values.
 //
@@ -100,8 +100,8 @@ func Equal(x, y interface{}, opts ...Option) bool {
 // same input values and options.
 //
 // The output is displayed as a literal in pseudo-Go syntax.
-// At the start of each line, a "-" prefix indicates an element removed from y,
-// a "+" prefix to indicates an element added to y, and the lack of a prefix
+// At the start of each line, a "-" prefix indicates an element removed from x,
+// a "+" prefix to indicates an element added from y, and the lack of a prefix
 // indicates an element common to both x and y. If possible, the output
 // uses fmt.Stringer.String or error.Error methods to produce more humanly
 // readable outputs. In such cases, the string is prefixed with either an

vendor/github.com/google/go-cmp/cmp/export_panic.go

@@ -1,6 +1,6 @@
 // Copyright 2017, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 // +build purego
 

vendor/github.com/google/go-cmp/cmp/export_unsafe.go

@@ -1,6 +1,6 @@
 // Copyright 2017, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 // +build !purego
 

vendor/github.com/google/go-cmp/cmp/internal/diff/debug_disable.go

@@ -1,6 +1,6 @@
 // Copyright 2017, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 // +build !cmp_debug
 

vendor/github.com/google/go-cmp/cmp/internal/diff/debug_enable.go

@@ -1,6 +1,6 @@
 // Copyright 2017, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 // +build cmp_debug
 

vendor/github.com/google/go-cmp/cmp/internal/diff/diff.go

@@ -1,6 +1,6 @@
 // Copyright 2017, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 // Package diff implements an algorithm for producing edit-scripts.
 // The edit-script is a sequence of operations needed to transform one list
@@ -119,7 +119,7 @@ func (r Result) Similar() bool {
 	return r.NumSame+1 >= r.NumDiff
 }
 
-var randInt = rand.New(rand.NewSource(time.Now().Unix())).Intn(2)
+var randBool = rand.New(rand.NewSource(time.Now().Unix())).Intn(2) == 0
 
 // Difference reports whether two lists of lengths nx and ny are equal
 // given the definition of equality provided as f.
@@ -168,17 +168,6 @@ func Difference(nx, ny int, f EqualFunc) (es EditScript) {
 	// A vertical edge is equivalent to inserting a symbol from list Y.
 	// A diagonal edge is equivalent to a matching symbol between both X and Y.
 
-	// To ensure flexibility in changing the algorithm in the future,
-	// introduce some degree of deliberate instability.
-	// This is achieved by fiddling the zigzag iterator to start searching
-	// the graph starting from the bottom-right versus than the top-left.
-	// The result may differ depending on the starting search location,
-	// but still produces a valid edit script.
-	zigzagInit := randInt // either 0 or 1
-	if flags.Deterministic {
-		zigzagInit = 0
-	}
-
 	// Invariants:
 	//	• 0 ≤ fwdPath.X ≤ (fwdFrontier.X, revFrontier.X) ≤ revPath.X ≤ nx
 	//	• 0 ≤ fwdPath.Y ≤ (fwdFrontier.Y, revFrontier.Y) ≤ revPath.Y ≤ ny
@@ -197,6 +186,11 @@ func Difference(nx, ny int, f EqualFunc) (es EditScript) {
 	// approximately the square-root of the search budget.
 	searchBudget := 4 * (nx + ny) // O(n)
 
+	// Running the tests with the "cmp_debug" build tag prints a visualization
+	// of the algorithm running in real-time. This is educational for
+	// understanding how the algorithm works. See debug_enable.go.
+	f = debug.Begin(nx, ny, f, &fwdPath.es, &revPath.es)
+
 	// The algorithm below is a greedy, meet-in-the-middle algorithm for
 	// computing sub-optimal edit-scripts between two lists.
 	//
@@ -214,22 +208,28 @@ func Difference(nx, ny int, f EqualFunc) (es EditScript) {
 	//	frontier towards the opposite corner.
 	//	• This algorithm terminates when either the X coordinates or the
 	//	Y coordinates of the forward and reverse frontier points ever intersect.
-	//
+
 	// This algorithm is correct even if searching only in the forward direction
 	// or in the reverse direction. We do both because it is commonly observed
 	// that two lists commonly differ because elements were added to the front
 	// or end of the other list.
 	//
-	// Running the tests with the "cmp_debug" build tag prints a visualization
-	// of the algorithm running in real-time. This is educational for
-	// understanding how the algorithm works. See debug_enable.go.
-	f = debug.Begin(nx, ny, f, &fwdPath.es, &revPath.es)
-	for {
+	// Non-deterministically start with either the forward or reverse direction
+	// to introduce some deliberate instability so that we have the flexibility
+	// to change this algorithm in the future.
+	if flags.Deterministic || randBool {
+		goto forwardSearch
+	} else {
+		goto reverseSearch
+	}
+
+forwardSearch:
+	{
 		// Forward search from the beginning.
 		if fwdFrontier.X >= revFrontier.X || fwdFrontier.Y >= revFrontier.Y || searchBudget == 0 {
-			break
+			goto finishSearch
 		}
-		for stop1, stop2, i := false, false, zigzagInit; !(stop1 && stop2) && searchBudget > 0; i++ {
+		for stop1, stop2, i := false, false, 0; !(stop1 && stop2) && searchBudget > 0; i++ {
 			// Search in a diagonal pattern for a match.
 			z := zigzag(i)
 			p := point{fwdFrontier.X + z, fwdFrontier.Y - z}
@@ -262,10 +262,14 @@ func Difference(nx, ny int, f EqualFunc) (es EditScript) {
 		} else {
 			fwdFrontier.Y++
 		}
+		goto reverseSearch
+	}
 
+reverseSearch:
+	{
 		// Reverse search from the end.
 		if fwdFrontier.X >= revFrontier.X || fwdFrontier.Y >= revFrontier.Y || searchBudget == 0 {
-			break
+			goto finishSearch
 		}
 		for stop1, stop2, i := false, false, 0; !(stop1 && stop2) && searchBudget > 0; i++ {
 			// Search in a diagonal pattern for a match.
@@ -300,8 +304,10 @@ func Difference(nx, ny int, f EqualFunc) (es EditScript) {
 		} else {
 			revFrontier.Y--
 		}
+		goto forwardSearch
 	}
 
+finishSearch:
 	// Join the forward and reverse paths and then append the reverse path.
 	fwdPath.connect(revPath.point, f)
 	for i := len(revPath.es) - 1; i >= 0; i-- {

vendor/github.com/google/go-cmp/cmp/internal/flags/flags.go

@@ -1,6 +1,6 @@
 // Copyright 2019, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 package flags
 

vendor/github.com/google/go-cmp/cmp/internal/flags/toolchain_legacy.go

@@ -1,6 +1,6 @@
 // Copyright 2019, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 // +build !go1.10
 

vendor/github.com/google/go-cmp/cmp/internal/flags/toolchain_recent.go

@@ -1,6 +1,6 @@
 // Copyright 2019, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 // +build go1.10
 

vendor/github.com/google/go-cmp/cmp/internal/function/func.go

@@ -1,6 +1,6 @@
 // Copyright 2017, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 // Package function provides functionality for identifying function types.
 package function

vendor/github.com/google/go-cmp/cmp/internal/value/name.go

@@ -1,6 +1,6 @@
 // Copyright 2020, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 package value
 

vendor/github.com/google/go-cmp/cmp/internal/value/pointer_purego.go

@@ -1,6 +1,6 @@
 // Copyright 2018, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 // +build purego
 

vendor/github.com/google/go-cmp/cmp/internal/value/pointer_unsafe.go

@@ -1,6 +1,6 @@
 // Copyright 2018, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 // +build !purego
 

vendor/github.com/google/go-cmp/cmp/internal/value/sort.go

@@ -1,6 +1,6 @@
 // Copyright 2017, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 package value
 

vendor/github.com/google/go-cmp/cmp/internal/value/zero.go

@@ -1,6 +1,6 @@
 // Copyright 2017, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 package value
 

vendor/github.com/google/go-cmp/cmp/options.go

@@ -1,6 +1,6 @@
 // Copyright 2017, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 package cmp
 

vendor/github.com/google/go-cmp/cmp/path.go

@@ -1,6 +1,6 @@
 // Copyright 2017, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 package cmp
 

vendor/github.com/google/go-cmp/cmp/report.go

@@ -1,6 +1,6 @@
 // Copyright 2017, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 package cmp
 

vendor/github.com/google/go-cmp/cmp/report_compare.go

@@ -1,6 +1,6 @@
 // Copyright 2019, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 package cmp
 
@@ -79,7 +79,7 @@ func (opts formatOptions) verbosity() uint {
 	}
 }
 
-const maxVerbosityPreset = 3
+const maxVerbosityPreset = 6
 
 // verbosityPreset modifies the verbosity settings given an index
 // between 0 and maxVerbosityPreset, inclusive.
@@ -100,7 +100,7 @@ func verbosityPreset(opts formatOptions, i int) formatOptions {
 func (opts formatOptions) FormatDiff(v *valueNode, ptrs *pointerReferences) (out textNode) {
 	if opts.DiffMode == diffIdentical {
 		opts = opts.WithVerbosity(1)
-	} else {
+	} else if opts.verbosity() < 3 {
 		opts = opts.WithVerbosity(3)
 	}
 

vendor/github.com/google/go-cmp/cmp/report_references.go

@@ -1,6 +1,6 @@
 // Copyright 2020, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 package cmp
 

vendor/github.com/google/go-cmp/cmp/report_reflect.go

@@ -1,6 +1,6 @@
 // Copyright 2019, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 package cmp
 
@@ -351,6 +351,8 @@ func formatMapKey(v reflect.Value, disambiguate bool, ptrs *pointerReferences) s
 	opts.PrintAddresses = disambiguate
 	opts.AvoidStringer = disambiguate
 	opts.QualifiedNames = disambiguate
+	opts.VerbosityLevel = maxVerbosityPreset
+	opts.LimitVerbosity = true
 	s := opts.FormatValue(v, reflect.Map, ptrs).String()
 	return strings.TrimSpace(s)
 }

vendor/github.com/google/go-cmp/cmp/report_slices.go

@@ -1,6 +1,6 @@
 // Copyright 2019, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 package cmp
 
@@ -26,8 +26,6 @@ func (opts formatOptions) CanFormatDiffSlice(v *valueNode) bool {
 		return false // No differences detected
 	case !v.ValueX.IsValid() || !v.ValueY.IsValid():
 		return false // Both values must be valid
-	case v.Type.Kind() == reflect.Slice && (v.ValueX.Len() == 0 || v.ValueY.Len() == 0):
-		return false // Both slice values have to be non-empty
 	case v.NumIgnored > 0:
 		return false // Some ignore option was used
 	case v.NumTransformed > 0:
@@ -45,7 +43,16 @@ func (opts formatOptions) CanFormatDiffSlice(v *valueNode) bool {
 		return false
 	}
 
-	switch t := v.Type; t.Kind() {
+	// Check whether this is an interface with the same concrete types.
+	t := v.Type
+	vx, vy := v.ValueX, v.ValueY
+	if t.Kind() == reflect.Interface && !vx.IsNil() && !vy.IsNil() && vx.Elem().Type() == vy.Elem().Type() {
+		vx, vy = vx.Elem(), vy.Elem()
+		t = vx.Type()
+	}
+
+	// Check whether we provide specialized diffing for this type.
+	switch t.Kind() {
 	case reflect.String:
 	case reflect.Array, reflect.Slice:
 		// Only slices of primitive types have specialized handling.
@@ -57,6 +64,11 @@ func (opts formatOptions) CanFormatDiffSlice(v *valueNode) bool {
 			return false
 		}
 
+		// Both slice values have to be non-empty.
+		if t.Kind() == reflect.Slice && (vx.Len() == 0 || vy.Len() == 0) {
+			return false
+		}
+
 		// If a sufficient number of elements already differ,
 		// use specialized formatting even if length requirement is not met.
 		if v.NumDiff > v.NumSame {
@@ -68,7 +80,7 @@ func (opts formatOptions) CanFormatDiffSlice(v *valueNode) bool {
 
 	// Use specialized string diffing for longer slices or strings.
 	const minLength = 64
-	return v.ValueX.Len() >= minLength && v.ValueY.Len() >= minLength
+	return vx.Len() >= minLength && vy.Len() >= minLength
 }
 
 // FormatDiffSlice prints a diff for the slices (or strings) represented by v.
@@ -77,6 +89,11 @@ func (opts formatOptions) CanFormatDiffSlice(v *valueNode) bool {
 func (opts formatOptions) FormatDiffSlice(v *valueNode) textNode {
 	assert(opts.DiffMode == diffUnknown)
 	t, vx, vy := v.Type, v.ValueX, v.ValueY
+	if t.Kind() == reflect.Interface {
+		vx, vy = vx.Elem(), vy.Elem()
+		t = vx.Type()
+		opts = opts.WithTypeMode(emitType)
+	}
 
 	// Auto-detect the type of the data.
 	var isLinedText, isText, isBinary bool

vendor/github.com/google/go-cmp/cmp/report_text.go

@@ -1,6 +1,6 @@
 // Copyright 2019, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 package cmp
 

vendor/github.com/google/go-cmp/cmp/report_value.go

@@ -1,6 +1,6 @@
 // Copyright 2019, The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
+// license that can be found in the LICENSE file.
 
 package cmp
 

vendor/github.com/kube-storage/replication-lib-utils/LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
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+      transformation or translation of a Source form, including but
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+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
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+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
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+      submitted to Licensor for inclusion in the Work by the copyright owner
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+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
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+      any Contribution intentionally submitted for inclusion in the Work
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+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   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.

vendor/github.com/kube-storage/replication-lib-utils/protosanitizer/protosanitizer.go

@@ -0,0 +1,150 @@
+/*
+Copyright 2021 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.
+*/
+
+// Reference
+// https://github.com/kubernetes-csi/csi-lib-utils/blob/master/protosanitizer/protosanitizer.go
+
+// Package protosanitizer supports logging of gRPC messages without accidentally
+// revealing sensitive fields.
+package protosanitizer
+
+import (
+	"encoding/json"
+	"fmt"
+	"reflect"
+	"strings"
+
+	"github.com/golang/protobuf/descriptor"
+	"github.com/golang/protobuf/proto"
+	protobuf "github.com/golang/protobuf/protoc-gen-go/descriptor"
+	"google.golang.org/protobuf/types/descriptorpb"
+)
+
+// StripReplicationSecrets returns a wrapper around the original Replication gRPC message
+// which has a Stringer implementation that serializes the message
+// as one-line JSON, but without including secret information.
+// Instead of the secret value(s), the string "***stripped***" is
+// included in the result.
+//
+// StripReplicationSecrets relies on an extension in Replication and thus can only
+// be used for messages based on that or a more recent spec!
+//
+// StripReplicationSecrets itself is fast and therefore it is cheap to pass the
+// result to logging functions which may or may not end up serializing
+// the parameter depending on the current log level.
+func StripReplicationSecrets(msg interface{}) fmt.Stringer {
+	return &stripSecrets{msg, isReplicationSecret}
+}
+
+type stripSecrets struct {
+	msg interface{}
+
+	isSecretField func(field *protobuf.FieldDescriptorProto) bool
+}
+
+func (s *stripSecrets) String() string {
+	// First convert to a generic representation. That's less efficient
+	// than using reflect directly, but easier to work with.
+	var parsed interface{}
+	b, err := json.Marshal(s.msg)
+	if err != nil {
+		return fmt.Sprintf("<<json.Marshal %T: %s>>", s.msg, err)
+	}
+	if err := json.Unmarshal(b, &parsed); err != nil {
+		return fmt.Sprintf("<<json.Unmarshal %T: %s>>", s.msg, err)
+	}
+
+	// Now remove secrets from the generic representation of the message.
+	s.strip(parsed, s.msg)
+
+	// Re-encoded the stripped representation and return that.
+	b, err = json.Marshal(parsed)
+	if err != nil {
+		return fmt.Sprintf("<<json.Marshal %T: %s>>", s.msg, err)
+	}
+	return string(b)
+}
+
+func (s *stripSecrets) strip(parsed, msg interface{}) {
+	protobufMsg, ok := msg.(descriptor.Message)
+	if !ok {
+		// Not a protobuf message, so we are done.
+		return
+	}
+
+	// The corresponding map in the parsed JSON representation.
+	parsedFields, ok := parsed.(map[string]interface{})
+	if !ok {
+		// Probably nil.
+		return
+	}
+
+	// Walk through all fields and replace those with ***stripped*** that
+	// are marked as secret. This relies on protobuf adding "json:" tags
+	// on each field where the name matches the field name in the protobuf
+	_, md := descriptor.ForMessage(protobufMsg)
+	fields := md.GetField()
+	for _, field := range fields {
+		if s.isSecretField(field) {
+			// Overwrite only if already set.
+			if _, ok := parsedFields[field.GetName()]; ok {
+				parsedFields[field.GetName()] = "***stripped***"
+			}
+		} else if field.GetType() == protobuf.FieldDescriptorProto_TYPE_MESSAGE {
+			typeName := strings.TrimPrefix(field.GetTypeName(), ".")
+			t := proto.MessageType(typeName)
+			if t == nil || t.Kind() != reflect.Ptr {
+				// Shouldn't happen, but
+				// better check anyway instead
+				// of panicking.
+				continue
+			}
+			v := reflect.New(t.Elem())
+
+			// Recursively strip the message(s) that
+			// the field contains.
+			i := v.Interface()
+			entry := parsedFields[field.GetName()]
+			if slice, ok := entry.([]interface{}); ok {
+				for _, entry := range slice {
+					s.strip(entry, i)
+				}
+			} else {
+				// Single value.
+				s.strip(entry, i)
+			}
+		}
+	}
+}
+
+// isReplicationSecret uses the replication.file_replication_proto_extTypes extension from replication to
+// determine whether a field contains secrets.
+func isReplicationSecret(field *protobuf.FieldDescriptorProto) bool {
+	ex, err := proto.GetExtension(field.Options, eReplicationSecret)
+	return err == nil && ex != nil && *ex.(*bool)
+}
+
+// eReplicationSecret represents the secret format at
+// https://github.com/kube-storage/spec/blob/v0.1.0/lib/go/replication/
+// replication.pb.go#L640-L649 .
+var eReplicationSecret = &proto.ExtensionDesc{
+	ExtendedType:  (*descriptorpb.FieldOptions)(nil),
+	ExtensionType: (*bool)(nil),
+	Field:         1099,
+	Name:          "replication.replication_secret",
+	Tag:           "varint,1099,opt,name=replication_secret",
+	Filename:      "replication.proto",
+}