Implement PR-2 review comments

internal/pkg/common/common.go

@@ -0,0 +1,56 @@
+package common
+
+import (
+	"bytes"
+	"math/rand"
+	"strings"
+	"time"
+)
+
+var (
+	letters = []rune("abcdefghijklmnopqrstuvwxyz")
+)
+
+const (
+	// ConfigmapUpdateOnChangeAnnotation is an annotation to detect changes in configmaps
+	ConfigmapUpdateOnChangeAnnotation = "configmap.reloader.stakater.com/reload"
+	// SecretUpdateOnChangeAnnotation is an annotation to detect changes in secrets
+	SecretUpdateOnChangeAnnotation = "secret.reloader.stakater.com/reload"
+	// ConfigmapEnvarPostfix is a postfix for configmap envVar
+	ConfigmapEnvarPostfix = "_CONFIGMAP"
+	// SecretEnvarPostfix is a postfix for secret envVar
+	SecretEnvarPostfix = "_SECRET"
+	// EnvVarPrefix is a Prefix for environment variable
+	EnvVarPrefix = "STAKATER_"
+)
+
+// ConvertToEnvVarName converts the given text into a usable env var
+// removing any special chars with '_' and transforming text to upper case
+func ConvertToEnvVarName(text string) string {
+	var buffer bytes.Buffer
+	upper := strings.ToUpper(text)
+	lastCharValid := false
+	for i := 0; i < len(upper); i++ {
+		ch := upper[i]
+		if (ch >= 'A' && ch <= 'Z') || (ch >= '0' && ch <= '9') {
+			buffer.WriteString(string(ch))
+			lastCharValid = true
+		} else {
+			if lastCharValid {
+				buffer.WriteString("_")
+			}
+			lastCharValid = false
+		}
+	}
+	return buffer.String()
+}
+
+// RandSeq generates a random sequence
+func RandSeq(n int) string {
+	rand.Seed(time.Now().UnixNano())
+	b := make([]rune, n)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+	return string(b)
+}

internal/pkg/common/common_test.go

@@ -0,0 +1,21 @@
+package common
+
+import (
+	"testing"
+)
+
+func TestConvertToEnvVarName(t *testing.T) {
+	data := "www.stakater.com"
+	envVar := ConvertToEnvVarName(data)
+	if envVar != "WWW_STAKATER_COM" {
+		t.Errorf("Failed to convert data into environment variable")
+	}
+}
+
+func TestRandSeq(t *testing.T) {
+	data := RandSeq(5)
+	newData := RandSeq(5)
+	if data == newData {
+		t.Errorf("Random sequence generator does not work correctly")
+	}
+}