GODT-1779: Remove go-imap

internal/useragent/platform.go

@@ -0,0 +1,66 @@
+// Copyright (c) 2022 Proton AG
+//
+// This file is part of Proton Mail Bridge.
+//
+// Proton Mail 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.
+//
+// Proton Mail 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 Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
+
+package useragent
+
+import (
+	"runtime"
+	"strings"
+
+	"github.com/Masterminds/semver/v3"
+)
+
+// IsCatalinaOrNewer checks whether the host is macOS Catalina 10.15.x or higher.
+func IsCatalinaOrNewer() bool {
+	return isThisDarwinNewerOrEqual(getMinCatalina())
+}
+
+// IsBigSurOrNewer checks whether the host is macOS BigSur 10.16.x or higher.
+func IsBigSurOrNewer() bool {
+	return isThisDarwinNewerOrEqual(getMinBigSur())
+}
+
+// IsVenturaOrNewer checks whether the host is macOS BigSur 13.x or higher.
+func IsVenturaOrNewer() bool {
+	return isThisDarwinNewerOrEqual(getMinVentura())
+}
+
+func getMinCatalina() *semver.Version { return semver.MustParse("19.0.0") }
+func getMinBigSur() *semver.Version   { return semver.MustParse("20.0.0") }
+func getMinVentura() *semver.Version  { return semver.MustParse("22.0.0") }
+
+func isThisDarwinNewerOrEqual(minVersion *semver.Version) bool {
+	if runtime.GOOS != "darwin" {
+		return false
+	}
+
+	rawVersion, err := getDarwinVersion()
+	if err != nil {
+		return false
+	}
+
+	return isVersionEqualOrNewer(minVersion, strings.TrimSpace(rawVersion))
+}
+
+// isVersionEqualOrNewer is separated to be able to run test on other than darwin.
+func isVersionEqualOrNewer(minVersion *semver.Version, rawVersion string) bool {
+	semVersion, err := semver.NewVersion(rawVersion)
+	if err != nil {
+		return false
+	}
+	return semVersion.GreaterThan(minVersion) || semVersion.Equal(minVersion)
+}