added util

src/Util.js

@@ -0,0 +1,84 @@
+const {exec} = require("child_process");
+
+module.exports.checkNodeVersion = function () {
+  let currentApropriateVersion = 14;
+  let nodeVersion = process.versions.node.split('.');
+
+  if (Number(nodeVersion[0]) < currentApropriateVersion) {
+    throw new Error(`The Node version must be at least v${currentApropriateVersion} or above.`);
+  };
+
+  return;
+};
+
+module.exports.checkPlatform = function () {
+  let platform = process.platform;
+  
+  // https://nodejs.org/api/process.html#process_process_platform
+  let inappropriatePlatform = ['aix', 'darwin', 'freebsd', 'openbsd', 'sunos', 'win32'];
+
+  if (inappropriatePlatform.includes(platform)) {
+    throw new Error("Your platform must be at least Linux.");
+  };
+
+  return;
+};
+
+module.exports.getDistroInfo = function () {
+  let current = {
+    distributorID: null, distributorVersion: null
+  };
+
+  // check version
+  exec('lsb_release -i -r', (error, stdout, stderr) => {
+    if (error || stderr) {
+      throw new Error(`Error while checking Linux distribution information: ${stderr ? stderr : error}`);
+    };
+
+    if (stdout) {
+      // sanitize
+      let parsed = res
+      .split(/\r|\n/gi) // remove break lines
+      .map(x => x.replace(/\s/gi, "")) // remove spaces, only remains [e.g. DistributorID:Ubuntu]
+      .filter(x => x); // filter empty string
+
+      let findDistributorID = parsed.find(val => val.match(/^(DistributorID)/gi));
+      let findReleaseVersion = parsed.find(val => val.match(/^(Release)/gi));
+
+      if (findDistributorID) {
+        let splitViaColon = findDistributorID.split(/(:)/gi);
+        if (splitViaColon) current.distributorID = splitViaColon.pop().toLowerCase();
+      };
+
+      if (findReleaseVersion) {
+        let splitViaColon = findReleaseVersion.split(/(:)/gi);
+        if (splitViaColon) current.distributorVersion = splitViaColon.pop().toLowerCase();
+      };
+    };
+  });
+
+  return current;
+};
+
+module.exports.checkPlatformExact = function () {
+  let distroInfo = this.getDistroInfo();
+  if (!distroInfo?.distributorID || !distroInfo?.distributorVersion) {
+    throw new Error("Missing distro platform information.");
+  };
+
+  // https://en.wikipedia.org/wiki/Uncomplicated_Firewall
+  let platform = distroInfo.distributorID;
+  if (String(platform).toLowerCase() !== "ubuntu") {
+    throw new Error("node-ufw only supported on Ubuntu.");
+  };
+
+  return true;
+};
+
+// soon to be continued
+// module.exports.checkPlatformVersion = function () {
+//   let distroInfo = this.getDistroInfo();
+//   if (!distroInfo?.distributorID || !distroInfo?.distributorVersion) {
+//     throw new Error("Missing distro platform information.");
+//   };
+// };