We build too many walls and not enough bridges

pkg/useragent/useragent.go

@@ -0,0 +1,57 @@
+// Copyright (c) 2020 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+package useragent
+
+import (
+	"fmt"
+	"os/exec"
+	"runtime"
+)
+
+// IsCatalinaOrNewer checks that host is MacOS Catalina 10.14.xx or higher.
+func IsCatalinaOrNewer() bool {
+	if runtime.GOOS != "darwin" {
+		return false
+	}
+	major, minor, _ := getMacVersion()
+	return isVersionCatalinaOrNewer(major, minor)
+}
+
+func getMacVersion() (major, minor, tiny int) {
+	major, minor, tiny = 10, 0, 0
+	out, err := exec.Command("sw_vers", "-productVersion").Output()
+	if err != nil {
+		return
+	}
+	return parseMacVersion(string(out))
+}
+
+func parseMacVersion(version string) (major, minor, tiny int) {
+	_, _ = fmt.Sscanf(version, "%d.%d.%d", &major, &minor, &tiny)
+	return
+}
+
+func isVersionCatalinaOrNewer(major, minor int) bool {
+	if major != 10 {
+		return false
+	}
+	if minor < 15 {
+		return false
+	}
+	return true
+}

pkg/useragent/useragent_test.go

@@ -0,0 +1,57 @@
+// Copyright (c) 2020 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+package useragent
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetMacVersion(t *testing.T) {
+	testData := map[string]struct{ major, minor, tiny int }{
+		"10.14.4":     {10, 14, 4},
+		"10.14.4\r\n": {10, 14, 4},
+		"10.14.0":     {10, 14, 0},
+		"10.14":       {10, 14, 0},
+		"10":          {10, 0, 0},
+	}
+
+	for arg, exp := range testData {
+		gotMajor, gotMinor, gotTiny := parseMacVersion(arg)
+		assert.Equal(t, exp.major, gotMajor, "arg %q", arg)
+		assert.Equal(t, exp.minor, gotMinor, "arg %q", arg)
+		assert.Equal(t, exp.tiny, gotTiny, "arg %q", arg)
+	}
+}
+
+func TestIsVersionCatalinaOrNewer(t *testing.T) {
+	testData := map[struct{ major, minor int }]bool{
+		{9, 0}:   false,
+		{9, 15}:  false,
+		{10, 13}: false,
+		{10, 14}: false,
+		{10, 15}: true,
+		{10, 16}: true,
+	}
+
+	for args, exp := range testData {
+		got := isVersionCatalinaOrNewer(args.major, args.minor)
+		assert.Equal(t, exp, got, "version %q.%q", args.major, args.minor)
+	}
+}