From 58637366582c95ad1355f1655e89abfeb2a744e7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Claus-Peter=20H=C3=BCbner?= <claus-peter.huebner@email.de>
Date: Fri, 25 Nov 2022 01:01:14 +0100
Subject: [PATCH] create DHT-KeyPair with optional configured Seed

---
 backend/src/federation/index.ts | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/backend/src/federation/index.ts b/backend/src/federation/index.ts
index 2ca58b432..a7a06e42a 100644
--- a/backend/src/federation/index.ts
+++ b/backend/src/federation/index.ts
@@ -4,11 +4,24 @@
 import DHT from '@hyperswarm/dht'
 // import { Connection } from '@dbTools/typeorm'
 import { backendLogger as logger } from '@/server/logger'
+import CONFIG from '@/config'
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const sodium = require('sodium-native')
 
 function between(min: number, max: number) {
   return Math.floor(Math.random() * (max - min + 1) + min)
 }
 
+const getSeed = (): Buffer | null => {
+  if (CONFIG.FEDERATE_DHT_SEED) {
+    const secret = CONFIG.FEDERATE_DHT_SEED
+    const seed = sodium.sodium_malloc(sodium.crypto_box_SEEDBYTES)
+    seed.write(secret, 'hex')
+    return seed
+  }
+  return null
+}
+
 const POLLTIME = 20000
 const SUCCESSTIME = 120000
 const ERRORTIME = 240000
@@ -28,7 +41,9 @@ export const startDHT = async (
   try {
     const TOPIC = DHT.hash(Buffer.from(topic))
 
-    const keyPair = DHT.keyPair()
+    const keyPair = DHT.keyPair(getSeed())
+    logger.info(`keyPairDHT: publicKey=${keyPair.publicKey.toString('hex')}`)
+    logger.info(`keyPairDHT: secretKey=${keyPair.secretKey.toString('hex')}`)
 
     const node = new DHT({ keyPair })