*Initial version

package.json

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+{
+    "name": "@lumeweb/peer-discovery-source-bittorrent",
+    "version": "0.1.0",
+    "devDependencies": {
+        "@types/b4a": "^1.6.0",
+        "@types/node": "^18.11.17",
+        "prettier": "^2.8.1",
+        "typescript": "^4.9.4"
+    },
+    "dependencies": {
+        "@lumeweb/peer-discovery": "https://git.lumeweb.com/LumeWeb/peer-discovery.git",
+        "b4a": "^1.6.1",
+        "bittorrent-dht": "^11.0.1",
+        "bittorrent-dht-sodium": "^1.2.0",
+        "sha.js": "^2.4.11"
+    }
+}

src/index.ts

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+import DHT from "bittorrent-dht";
+import { Peer, PeerDiscovery } from "@lumeweb/peer-discovery";
+import eddsa from "bittorrent-dht-sodium";
+import sha from "sha.js";
+import * as Buffer from "buffer";
+import b4a from "b4a";
+
+export default class BitTorrentSource {
+  private _discovery: PeerDiscovery;
+  private _dht: DHT;
+  private _readyResolve: Function;
+  private _ready: Promise<any> = new Promise((resolve) => {
+    this._readyResolve = resolve;
+  });
+
+  constructor(discovery: PeerDiscovery, bootstrap?: string[]) {
+    this._discovery = discovery;
+    this._dht = new DHT({ bootstrap, verify: eddsa.verify });
+    this._dht.on("ready", this._readyResolve);
+  }
+
+  public async discover(pubkey: Buffer): Promise<boolean | Peer> {
+    await this._ready;
+
+    const hash = sha("sha1").update(pubkey).digest();
+
+    return new Promise<boolean | Peer>((resolve, reject) => {
+      this._dht.get(hash, function (err, res) {
+        if (err) {
+          console.log(err);
+          reject(false);
+          return;
+        }
+
+        const json = JSON.parse(b4a.from(res.v).toString());
+
+        resolve({ host: json?.host, port: json?.port });
+      });
+    });
+  }
+
+  public register(name: string): boolean {
+    return this._discovery.registerSource(name, this.discover.bind(this));
+  }
+}

tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "esnext",
+        "sourceMap": true,
+        "esModuleInterop": true,
+        "outDir": "dist",
+        "declaration": true
+    },
+    "include": ["src"],
+    "exclude": [
+        "node_modules"
+    ]
+}