refactor!: cleanup codebase & revampirize UT

.gitignore

@@ -102,3 +102,5 @@ dist
 
 # TernJS port file
 .tern-port
+
+/temp

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2021 NodeSecure
+Copyright (c) 2023 NodeSecure
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

package.json

@@ -1,47 +1,48 @@
-{
-  "name": "@nodesecure/authors",
-  "version": "1.0.2",
-  "description": "NodeSecure (npm) authors analysis package",
-  "exports": "./src/index.js",
-  "type": "module",
-  "types": "./src/index.d.ts",
-  "scripts": {
-    "lint": "cross-env eslint ./src",
-    "test-only": "cross-env esm-tape-runner 'test/**/*.js' | tap-monkey",
-    "test": "npm run lint && npm run test-only",
-    "coverage": "c8 -r html npm test"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/NodeSecure/authors.git"
-  },
-  "keywords": [
-    "NodeSecure",
-    "authors",
-    "author",
-    "npm"
-  ],
-  "files": [
-    "src"
-  ],
-  "author": "GENTILHOMME Thomas <gentilhomme.thomas@gmail.com>",
-  "license": "MIT",
-  "bugs": {
-    "url": "https://github.com/NodeSecure/authors/issues"
-  },
-  "homepage": "https://github.com/NodeSecure/authors#readme",
-  "devDependencies": {
-    "@nodesecure/eslint-config": "^1.6.0",
-    "@nodesecure/scanner": "^3.8.2",
-    "@npm/types": "^1.0.2",
-    "@small-tech/esm-tape-runner": "^2.0.0",
-    "@small-tech/tap-monkey": "^1.4.0",
-    "c8": "^7.12.0",
-    "cross-env": "^7.0.3",
-    "tape": "^5.6.3"
-  },
-  "dependencies": {
-    "@myunisoft/httpie": "^1.10.0",
-    "@nodesecure/domain-check": "^1.0.1"
-  }
-}
+{
+  "name": "@nodesecure/authors",
+  "version": "1.0.2",
+  "description": "NodeSecure (npm) authors analysis package",
+  "exports": "./dist/index.js",
+  "type": "module",
+  "types": "./dist/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "lint": "eslint src/*.ts",
+    "test-only": "node --test test/",
+    "test": "npm run lint && npm run test-only",
+    "coverage": "c8 -r html npm test"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/NodeSecure/authors.git"
+  },
+  "keywords": [
+    "NodeSecure",
+    "authors",
+    "author",
+    "npm"
+  ],
+  "files": [
+    "index.js",
+    "index.d.ts",
+    "src"
+  ],
+  "author": "GENTILHOMME Thomas <gentilhomme.thomas@gmail.com>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/NodeSecure/authors/issues"
+  },
+  "homepage": "https://github.com/NodeSecure/authors#readme",
+  "devDependencies": {
+    "@nodesecure/eslint-config": "^1.8.0",
+    "@nodesecure/scanner": "^4.0.0",
+    "@types/node": "^20.5.9",
+    "c8": "^8.0.1",
+    "typescript": "^5.2.2"
+  },
+  "dependencies": {
+    "@myunisoft/httpie": "^2.0.1",
+    "@npm/types": "^1.0.2",
+    "@openally/result": "^1.2.0"
+  }
+}

src/domains.ts

@@ -0,0 +1,66 @@
+// Import Node.js Dependencies
+import dns from "node:dns/promises";
+
+// Import Third-party Dependencies
+import { Some, None, Option } from "@openally/result";
+
+// Import Internal Dependencies
+import { whois } from "./utils/whois.js";
+
+export type DnsNotFound = {
+  state: "not found";
+}
+
+export type DnsResolved = { state: "not found" } | {
+  state: "expired" | "active";
+  expirationDate: string | null;
+  mxRecords: string[];
+}
+
+export type ResolveResult = DnsNotFound | DnsResolved;
+
+export class DomainResolver {
+  #cache: Map<string, DnsResolved> = new Map();
+
+  async resolve(
+    domain: string
+  ): Promise<ResolveResult> {
+    if (this.#cache.has(domain)) {
+      return this.#cache.get(domain)!;
+    }
+
+    const mxRecords = await safeResolveMx(domain);
+    if (mxRecords.none) {
+      return {
+        state: "not found"
+      };
+    }
+
+    const expirationDate = await whois(domain);
+    const result: DnsResolved = {
+      state: expirationDate === null ? "expired" : "active",
+      expirationDate,
+      mxRecords: mxRecords.safeUnwrap()
+    };
+    this.#cache.set(domain, result);
+
+    return result;
+  }
+
+  clear() {
+    this.#cache.clear();
+  }
+}
+
+async function safeResolveMx(domain: string): Promise<Option<string[]>> {
+  try {
+    const mxRecords = await dns.resolveMx(domain);
+
+    return Some(
+      mxRecords.map(({ exchange }) => exchange)
+    );
+  }
+  catch {
+    return None;
+  }
+}