feat(BRIDGE-309): Update to the bridge updater logic corresponding to the version file restructure

internal/updater/versioncompare/compare_darwin.go

@@ -0,0 +1,134 @@
+// Copyright (c) 2025 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/>.
+
+//go:build darwin
+
+package versioncompare
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/elastic/go-sysinfo/types"
+	"github.com/sirupsen/logrus"
+)
+
+func (sysVer SystemVersion) IsHostVersionEligible(log *logrus.Entry, host types.Host, getHostOSVersion func(host types.Host) string) (bool, error) {
+	if sysVer.Minimum == "" && sysVer.Maximum == "" {
+		return true, nil
+	}
+
+	// We use getHostOSVersion simply for testing; It's passed via Bridge.
+	var hostVersion string
+	if getHostOSVersion == nil {
+		hostVersion = host.Info().OS.Version
+	} else {
+		hostVersion = getHostOSVersion(host)
+	}
+
+	log.Debugf("Checking host OS and update system version requirements. Host: %s; Maximum: %s; Minimum: %s",
+		hostVersion, sysVer.Maximum, sysVer.Minimum)
+
+	hostVersionArr := strings.Split(hostVersion, ".")
+	if len(hostVersionArr) == 0 || hostVersion == "" {
+		return true, fmt.Errorf("could not get host version: %v", hostVersion)
+	}
+
+	hostVersionArrInt := make([]int, len(hostVersionArr))
+	for i := 0; i < len(hostVersionArr); i++ {
+		hostNum, err := strconv.Atoi(hostVersionArr[i])
+		if err != nil {
+			// If we receive an alphanumeric version - we should continue with the update and stop checking for
+			// OS version requirements.
+			return true, fmt.Errorf("invalid host version number: %s - %s", hostVersionArr[i], hostVersion)
+		}
+		hostVersionArrInt[i] = hostNum
+	}
+
+	if sysVer.Minimum != "" {
+		pass, err := compareMinimumVersion(hostVersionArrInt, sysVer.Minimum)
+		if err != nil {
+			return false, err
+		}
+
+		if !pass {
+			return false, fmt.Errorf("host version is below minimum: hostVersion %v - minimumVersion %v", hostVersion, sysVer.Minimum)
+		}
+	}
+
+	if sysVer.Maximum != "" {
+		pass, err := compareMaximumVersion(hostVersionArrInt, sysVer.Maximum)
+		if err != nil {
+			return false, err
+		}
+
+		if !pass {
+			return false, fmt.Errorf("host version is above maximum version: hostVersion %v - minimumVersion %v", hostVersion, sysVer.Maximum)
+		}
+	}
+
+	return true, nil
+}
+
+func compareMinimumVersion(hostVersionArr []int, minVersion string) (bool, error) {
+	minVersionArr := strings.Split(minVersion, ".")
+	iterationDepth := min(len(hostVersionArr), len(minVersionArr))
+
+	for i := 0; i < iterationDepth; i++ {
+		hostNum := hostVersionArr[i]
+
+		minNum, err := strconv.Atoi(minVersionArr[i])
+		if err != nil {
+			return false, fmt.Errorf("invalid minimum version number: %s - %s", minVersionArr[i], minVersion)
+		}
+
+		if hostNum < minNum {
+			return false, nil
+		}
+
+		if hostNum > minNum {
+			return true, nil
+		}
+	}
+
+	return true, nil // minVersion is inclusive
+}
+
+func compareMaximumVersion(hostVersionArr []int, maxVersion string) (bool, error) {
+	maxVersionArr := strings.Split(maxVersion, ".")
+	iterationDepth := min(len(maxVersionArr), len(hostVersionArr))
+
+	for i := 0; i < iterationDepth; i++ {
+		hostNum := hostVersionArr[i]
+
+		maxNum, err := strconv.Atoi(maxVersionArr[i])
+		if err != nil {
+			return false, fmt.Errorf("invalid maximum version number: %s - %s", maxVersionArr[i], maxVersion)
+		}
+
+		if hostNum > maxNum {
+			return false, nil
+		}
+
+		if hostNum < maxNum {
+			return true, nil
+		}
+	}
+
+	return true, nil // maxVersion is inclusive
+}