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const { run, build, readAll, readFile, env } = Deno;
// Get machine ID// Permission in Windows: --allow-run --allow-env// Permission in MacOS: --allow-run// Permission in Linux: --allow-readexport async function getMachineId(): Promise<string> {  switch (build.os) {    case "linux":      return getMachineIDLinux();    case "windows":      return getMachineIDWin();    case "darwin":      return getMachineIDMac();    default:      throw new Error(`Not support your operate system '${build.os}'`);  }}
function parse(bytes: Uint8Array): string {  const output = new TextDecoder().decode(bytes);
  switch (build.os) {    case "linux":      return output.trim();    case "windows":      return output        .toString()        .split("REG_SZ")[1]        .replace(/\r+|\n+|\s+/gi, "")        .trim();    case "darwin":      const lines = output.split("\n");      for (const line of lines) {        // here is the match line        // "IOPlatformUUID" = "A8226C69-2364-5B3E-83CC-1A72D7531679"        if (line.indexOf("IOPlatformUUID") > 0) {          const [_, val] = line.split(/\s*=\s*/);          return val.replace(/^"|"$/g, "");        }      }      return "";    default:      throw new Error(`Not support your operate system '${build.os}'`);  }}
async function getMachineIDWin(): Promise<string> {  const winDir = env.get("windir");  const ps = run({    stdout: "piped",    cmd: [      `${winDir}\\System32\\REG.exe`,      "QUERY",      "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Cryptography",      "/v",      "MachineGuid",    ],  });
  const output = await readAll(ps.stdout!);
  ps.stdout?.close();  ps.close();
  return parse(output);}
async function getMachineIDMac(): Promise<string> {  const ps = run({    stdout: "piped",    cmd: ["ioreg", "-rd1", "-c", "IOPlatformExpertDevice"],  });
  const output = await readAll(ps.stdout!);
  ps.stdout?.close();  ps.close();
  return parse(output);}
async function getMachineIDLinux(): Promise<string> {  // dbusPath is the default path for dbus machine id.  const dbusPath = "/var/lib/dbus/machine-id";  // dbusPathEtc is the default path for dbus machine id located in /etc.  // Some systems (like Fedora 20) only know this path.  // Sometimes it's the other way round.  const dbusPathEtc = "/etc/machine-id";
  return parse(    await readFile(dbusPath).catch(() => {      // try fallback path      return readFile(dbusPathEtc);    }),  );}