Update/refactor utility functions

- Replace 'containsString' function with slices.Contains.
- Move 'confirm' function to util package.

internal/cmd/delete.go

@@ -110,13 +110,3 @@ postgresclusters/hippo deleted`)
 
 	return cmd
 }
-
-// containsString returns true if slice contains element
-func containsString(slice []string, element string) bool {
-	for _, elem := range slice {
-		if elem == element {
-			return true
-		}
-	}
-	return false
-}

internal/cmd/show.go

@@ -27,6 +27,7 @@ import (
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	v1 "k8s.io/client-go/kubernetes/typed/core/v1"
+	"k8s.io/utils/strings/slices"
 	"sigs.k8s.io/yaml"
 
 	"github.com/crunchydata/postgres-operator-client/internal"
@@ -353,7 +354,7 @@ func showUser(config *internal.Config, args []string, showSensitive bool) (strin
 		for i := 0; confirmed == nil && i < 10; i++ {
 			// retry 10 times or until a confirmation is given or denied,
 			// whichever comes first
-			confirmed = confirm(os.Stdin, os.Stdout)
+			confirmed = util.Confirm(os.Stdin, os.Stdout)
 		}
 
 		if confirmed == nil || !*confirmed {
@@ -420,7 +421,7 @@ func userData(fields []string, list *corev1.SecretList) (string, error) {
 			if err != nil {
 				return output, err
 			}
-			if containsString(fields, k) {
+			if slices.Contains(fields, k) {
 				output += fmt.Sprintf("  %s: %s\n", strings.ToUpper(k), string(d))
 			}
 		}

internal/util/util.go

@@ -0,0 +1,55 @@
+// Copyright 2021 - 2023 Crunchy Data Solutions, Inc.
+//
+// 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 (
+	"bufio"
+	"fmt"
+	"io"
+
+	"k8s.io/utils/strings/slices"
+)
+
+// Confirm uses a Scanner to parse user input. A user must type in "yes" or "no"
+// and then press enter. It has fuzzy matching, so "y", "Y", "yes", "YES",
+// and "Yes" all count as confirmations and return 'true'. Similarly, "n", "N",
+// "no", "No", "NO" all deny confirmation and return 'false'. If the input is not
+// recognized, nil is returned.
+func Confirm(reader io.Reader, writer io.Writer) *bool {
+	var response string
+	var boolVar bool
+
+	scanner := bufio.NewScanner(reader)
+	if scanner.Scan() {
+		response = scanner.Text()
+	}
+
+	if scanner.Err() != nil || response == "" {
+		fmt.Fprint(writer, "Please type yes or no and then press enter: ")
+		return nil
+	}
+
+	yesResponses := []string{"y", "Y", "yes", "Yes", "YES"}
+	noResponses := []string{"n", "N", "no", "No", "NO"}
+	if slices.Contains(yesResponses, response) {
+		boolVar = true
+		return &boolVar
+	} else if slices.Contains(noResponses, response) {
+		return &boolVar
+	} else {
+		fmt.Fprint(writer, "Please type yes or no and then press enter: ")
+		return nil
+	}
+}

internal/util/util_test.go

@@ -0,0 +1,66 @@
+// Copyright 2021 - 2023 Crunchy Data Solutions, Inc.
+//
+// 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 (
+	"bytes"
+	"io"
+	"strings"
+	"testing"
+
+	"gotest.tools/v3/assert"
+)
+
+func TestConfirmDelete(t *testing.T) {
+
+	testsCases := []struct {
+		input           string
+		invalidResponse bool
+		confirmed       bool
+	}{
+		{"abc", true, false}, // invalid
+		{"", true, false},    // invalid
+		{"y", false, true},
+		{"Y", false, true},
+		{"yes", false, true},
+		{"Yes", false, true},
+		{"YES", false, true},
+		{"n", false, false},
+		{"N", false, false},
+		{"no", false, false},
+		{"No", false, false},
+		{"NO", false, false},
+		{"yep", true, false},  // invalid
+		{"nope", true, false}, // invalid
+	}
+
+	for _, tc := range testsCases {
+		t.Run("input is "+tc.input, func(t *testing.T) {
+			var reader io.Reader = strings.NewReader(tc.input)
+			var writer bytes.Buffer
+			confirmed := Confirm(reader, &writer)
+			if tc.invalidResponse {
+				assert.Assert(t, confirmed == nil)
+				response, err := writer.ReadString(':')
+				assert.NilError(t, err)
+				assert.Equal(t, response, "Please type yes or no and then press enter:")
+
+			} else {
+				assert.Assert(t, confirmed != nil)
+				assert.Assert(t, *confirmed == tc.confirmed)
+			}
+		})
+	}
+}