From 9f6abaf952723e07d5691a847ebca061e5b704c5 Mon Sep 17 00:00:00 2001
From: Franck Royer <franck@royer.one>
Date: Wed, 6 Oct 2021 12:51:36 +1100
Subject: [PATCH] Create util mod with `bufToHex` that includes 0x prefix

As this is how the string is represented for Community id.
---
 packages/status-communities/src/identity.ts           |  5 +++--
 packages/status-communities/src/messenger.spec.ts     |  6 +++---
 packages/status-communities/src/utils.ts              | 11 +++++++++++
 .../src/wire/application_metadata_message.ts          |  4 ++--
 4 files changed, 19 insertions(+), 7 deletions(-)
 create mode 100644 packages/status-communities/src/utils.ts

diff --git a/packages/status-communities/src/identity.ts b/packages/status-communities/src/identity.ts
index 88ec6e8..368d505 100644
--- a/packages/status-communities/src/identity.ts
+++ b/packages/status-communities/src/identity.ts
@@ -2,9 +2,10 @@ import { Buffer } from "buffer";
 
 import { keccak256 } from "js-sha3";
 import { generatePrivateKey } from "js-waku";
-import { utils } from "js-waku";
 import * as secp256k1 from "secp256k1";
 
+import { hexToBuf } from "./utils";
+
 export class Identity {
   public constructor(public privateKey: Uint8Array) {}
 
@@ -20,7 +21,7 @@ export class Identity {
     const hash = keccak256(payload);
 
     const { signature, recid } = secp256k1.ecdsaSign(
-      utils.hexToBuf(hash),
+      hexToBuf(hash),
       this.privateKey
     );
 
diff --git a/packages/status-communities/src/messenger.spec.ts b/packages/status-communities/src/messenger.spec.ts
index 6d10a9e..1cf734d 100644
--- a/packages/status-communities/src/messenger.spec.ts
+++ b/packages/status-communities/src/messenger.spec.ts
@@ -1,9 +1,9 @@
 import { expect } from "chai";
 import debug from "debug";
-import { utils } from "js-waku";
 
 import { Identity } from "./identity";
 import { Messenger } from "./messenger";
+import { bufToHex } from "./utils";
 import { ApplicationMetadataMessage } from "./wire/application_metadata_message";
 import { ContentType } from "./wire/chat_message";
 
@@ -106,8 +106,8 @@ describe("Messenger", () => {
 
     const receivedMessage = await receivedMessagePromise;
 
-    expect(utils.bufToHex(receivedMessage.signer!)).to.eq(
-      utils.bufToHex(identityAlice.publicKey)
+    expect(bufToHex(receivedMessage.signer!)).to.eq(
+      bufToHex(identityAlice.publicKey)
     );
   });
 
diff --git a/packages/status-communities/src/utils.ts b/packages/status-communities/src/utils.ts
new file mode 100644
index 0000000..e8a4656
--- /dev/null
+++ b/packages/status-communities/src/utils.ts
@@ -0,0 +1,11 @@
+import { utils } from "js-waku";
+
+const hexToBuf = utils.hexToBuf;
+export { hexToBuf };
+
+/**
+ * Return hex string with 0x prefix (commonly used for string format of a community id/public key.
+ */
+export function bufToHex(buf: Uint8Array): string {
+  return "0x" + utils.bufToHex(buf);
+}
diff --git a/packages/status-communities/src/wire/application_metadata_message.ts b/packages/status-communities/src/wire/application_metadata_message.ts
index b9ce2d0..f7458b5 100644
--- a/packages/status-communities/src/wire/application_metadata_message.ts
+++ b/packages/status-communities/src/wire/application_metadata_message.ts
@@ -1,11 +1,11 @@
 import { keccak256 } from "js-sha3";
-import { utils } from "js-waku";
 import { Reader } from "protobufjs";
 import secp256k1 from "secp256k1";
 
 import { Identity } from "../identity";
 import * as proto from "../proto/status/v1/application_metadata_message";
 import { ApplicationMetadataMessage_Type } from "../proto/status/v1/application_metadata_message";
+import { hexToBuf } from "../utils";
 
 import { ChatMessage } from "./chat_message";
 
@@ -70,6 +70,6 @@ export class ApplicationMetadataMessage {
     const recid = this.signature.slice(64)[0];
     const hash = keccak256(this.payload);
 
-    return secp256k1.ecdsaRecover(signature, recid, utils.hexToBuf(hash));
+    return secp256k1.ecdsaRecover(signature, recid, hexToBuf(hash));
   }
 }