chore: Add cmd and tls utils

closes #23

Signed-off-by: Firas Qutishat <[email protected]>

go.mod

@@ -15,6 +15,7 @@ require (
 	github.com/gopherjs/gopherjs v0.0.0-20200209183636-89e6cbcd0b6d // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/sirupsen/logrus v1.4.2
+	github.com/spf13/cobra v0.0.6
 	github.com/stretchr/testify v1.4.0
 	gitlab.com/flimzy/testy v0.0.2 // indirect
 	golang.org/x/net v0.0.0-20200202094626-16171245cfb2 // indirect

go.sum

@@ -1,51 +1,167 @@
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pkg/utils/cmd/util.go

@@ -0,0 +1,77 @@
+/*
+Copyright SecureKey Technologies Inc. All Rights Reserved.
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package cmd
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/spf13/cobra"
+)
+
+// GetUserSetVarFromString returns values either command line flag or environment variable
+func GetUserSetVarFromString(cmd *cobra.Command, flagName, envKey string, isOptional bool) (string, error) {
+	if cmd.Flags().Changed(flagName) {
+		value, err := cmd.Flags().GetString(flagName)
+		if err != nil {
+			return "", fmt.Errorf(flagName+" flag not found: %s", err)
+		}
+
+		if value == "" {
+			return "", fmt.Errorf("%s value is empty", flagName)
+		}
+
+		return value, nil
+	}
+
+	value, isSet := os.LookupEnv(envKey)
+
+	if isOptional || isSet {
+		if !isOptional && value == "" {
+			return "", fmt.Errorf("%s value is empty", envKey)
+		}
+
+		return value, nil
+	}
+
+	return "", errors.New("Neither " + flagName + " (command line flag) nor " + envKey +
+		" (environment variable) have been set.")
+}
+
+// GetUserSetVarFromArrayString returns values either command line flag or environment variable
+func GetUserSetVarFromArrayString(cmd *cobra.Command, flagName, envKey string, isOptional bool) ([]string, error) {
+	if cmd.Flags().Changed(flagName) {
+		value, err := cmd.Flags().GetStringArray(flagName)
+		if err != nil {
+			return nil, fmt.Errorf(flagName+" flag not found: %s", err)
+		}
+
+		if len(value) == 0 {
+			return nil, fmt.Errorf("%s value is empty", flagName)
+		}
+
+		return value, nil
+	}
+
+	value, isSet := os.LookupEnv(envKey)
+
+	if isOptional || isSet {
+		if !isOptional && value == "" {
+			return nil, fmt.Errorf("%s value is empty", envKey)
+		}
+
+		if value == "" {
+			return []string{}, nil
+		}
+
+		return strings.Split(value, ","), nil
+	}
+
+	return nil, errors.New("Neither " + flagName + " (command line flag) nor " + envKey +
+		" (environment variable) have been set.")
+}