Pull request: 4925-refactor-tls-vol-1

Merge in DNS/adguard-home from 4925-refactor-tls-vol-1 to master

Squashed commit of the following:

commit ad87b2e93183b28f2e38666cc4267fa8dfd1cca0
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Oct 14 18:49:22 2022 +0300

    all: refactor tls, vol. 1

    Co-Authored-By: Rahul Somasundaram <Rahul.Somasundaram@checkpt.com>

internal/aghtls/aghtls_test.go

@@ -0,0 +1,57 @@
+package aghtls_test
+
+import (
+	"crypto/tls"
+	"testing"
+
+	"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
+	"github.com/AdguardTeam/AdGuardHome/internal/aghtls"
+	"github.com/AdguardTeam/golibs/testutil"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMain(m *testing.M) {
+	aghtest.DiscardLogOutput(m)
+}
+
+func TestParseCiphers(t *testing.T) {
+	testCases := []struct {
+		name       string
+		wantErrMsg string
+		want       []uint16
+		in         []string
+	}{{
+		name:       "nil",
+		wantErrMsg: "",
+		want:       nil,
+		in:         nil,
+	}, {
+		name:       "empty",
+		wantErrMsg: "",
+		want:       []uint16{},
+		in:         []string{},
+	}, {}, {
+		name:       "one",
+		wantErrMsg: "",
+		want:       []uint16{tls.TLS_AES_128_GCM_SHA256},
+		in:         []string{"TLS_AES_128_GCM_SHA256"},
+	}, {
+		name:       "several",
+		wantErrMsg: "",
+		want:       []uint16{tls.TLS_AES_128_GCM_SHA256, tls.TLS_AES_256_GCM_SHA384},
+		in:         []string{"TLS_AES_128_GCM_SHA256", "TLS_AES_256_GCM_SHA384"},
+	}, {
+		name:       "bad",
+		wantErrMsg: `unknown cipher "bad_cipher"`,
+		want:       nil,
+		in:         []string{"bad_cipher"},
+	}}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			got, err := aghtls.ParseCiphers(tc.in)
+			testutil.AssertErrorMsg(t, tc.wantErrMsg, err)
+			assert.Equal(t, tc.want, got)
+		})
+	}
+}