Maintenance: generate Openvpn conf for 2.4 or 2.5

internal/provider/utils/cipher.go

@@ -0,0 +1,15 @@
+package utils
+
+import "strings"
+
+func CipherLines(cipher, version string) (lines []string) {
+	switch {
+	case strings.HasPrefix(version, "2.4"):
+		return []string{"cipher " + cipher}
+	default: // 2.5 and above
+		return []string{
+			"data-ciphers-fallback " + cipher,
+			"data-ciphers " + cipher,
+		}
+	}
+}

internal/provider/utils/cipher_test.go

@@ -0,0 +1,45 @@
+package utils
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_CipherLines(t *testing.T) {
+	t.Parallel()
+	testCases := map[string]struct {
+		version string
+		lines   []string
+	}{
+		"empty version": {
+			lines: []string{
+				"data-ciphers-fallback AES",
+				"data-ciphers AES",
+			},
+		},
+		"2.4.5": {
+			version: "2.4.5",
+			lines:   []string{"cipher AES"},
+		},
+		"2.5.3": {
+			version: "2.5.3",
+			lines: []string{
+				"data-ciphers-fallback AES",
+				"data-ciphers AES",
+			},
+		},
+	}
+	for name, testCase := range testCases {
+		testCase := testCase
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+
+			const cipher = "AES"
+
+			lines := CipherLines(cipher, testCase.version)
+
+			assert.Equal(t, testCase.lines, lines)
+		})
+	}
+}