UPDATE: Add admin relaunch functionality for macOS and Linux, enhance README with new features and usage examples

admin_self_darwin.go

@@ -0,0 +1,46 @@
+//go:build darwin
+// +build darwin
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func relaunchWithAdminIfNeeded() (bool, error) {
+	if os.Geteuid() == 0 {
+		return false, nil
+	}
+
+	exePath, err := os.Executable()
+	if err != nil {
+		return false, fmt.Errorf("get executable path: %w", err)
+	}
+
+	workDir, err := os.Getwd()
+	if err != nil {
+		return false, fmt.Errorf("get working directory: %w", err)
+	}
+
+	args := make([]string, 0, len(os.Args))
+	args = append(args, shellQuote(exePath))
+	for _, arg := range os.Args[1:] {
+		args = append(args, shellQuote(arg))
+	}
+
+	command := fmt.Sprintf(
+		"cd %s && %s > /dev/null 2>&1 &",
+		shellQuote(workDir),
+		strings.Join(args, " "),
+	)
+	script := fmt.Sprintf("do shell script %s with administrator privileges", appleScriptString(command))
+
+	if out, err := exec.Command("osascript", "-e", script).CombinedOutput(); err != nil {
+		return false, formatCommandError("relaunch proxy as admin", err, out)
+	}
+
+	return true, nil
+}