Merge pull request #795 from cosmos/770-makeCosmoshubPath-stargate

Export makeCosmoshubPath from proto-signing/stargate

CHANGELOG.md

@@ -6,6 +6,11 @@ and this project adheres to
 
 ## [Unreleased]
 
+### Added
+
+- @cosmjs/proto-signing: Export `makeCosmoshubPath` helper.
+- @cosmjs/stargate: Export `makeCosmoshubPath` helper.
+
 ## [0.25.1] - 2021-05-06
 
 ### Added

packages/proto-signing/src/index.ts

@@ -16,6 +16,7 @@ export {
 } from "./registry";
 export { DirectSecp256k1HdWallet, DirectSecp256k1HdWalletOptions } from "./directsecp256k1hdwallet";
 export { DirectSecp256k1Wallet } from "./directsecp256k1wallet";
+export { makeCosmoshubPath } from "./paths";
 export { decodePubkey, encodePubkey } from "./pubkey";
 export {
   AccountData,

packages/proto-signing/src/paths.spec.ts

@@ -0,0 +1,26 @@
+import { Slip10RawIndex } from "@cosmjs/crypto";
+
+import { makeCosmoshubPath } from "./paths";
+
+describe("paths", () => {
+  describe("makeCosmoshubPath", () => {
+    it("works", () => {
+      // m/44'/118'/0'/0/0
+      expect(makeCosmoshubPath(0)).toEqual([
+        Slip10RawIndex.hardened(44),
+        Slip10RawIndex.hardened(118),
+        Slip10RawIndex.hardened(0),
+        Slip10RawIndex.normal(0),
+        Slip10RawIndex.normal(0),
+      ]);
+      // m/44'/118'/0'/0/123
+      expect(makeCosmoshubPath(123)).toEqual([
+        Slip10RawIndex.hardened(44),
+        Slip10RawIndex.hardened(118),
+        Slip10RawIndex.hardened(0),
+        Slip10RawIndex.normal(0),
+        Slip10RawIndex.normal(123),
+      ]);
+    });
+  });
+});

packages/proto-signing/src/paths.ts

@@ -0,0 +1,15 @@
+import { HdPath, Slip10RawIndex } from "@cosmjs/crypto";
+
+/**
+ * The Cosmos Hub derivation path in the form `m/44'/118'/0'/0/a`
+ * with 0-based account index `a`.
+ */
+export function makeCosmoshubPath(a: number): HdPath {
+  return [
+    Slip10RawIndex.hardened(44),
+    Slip10RawIndex.hardened(118),
+    Slip10RawIndex.hardened(0),
+    Slip10RawIndex.normal(0),
+    Slip10RawIndex.normal(a),
+  ];
+}

packages/stargate/src/index.ts

@@ -1,5 +1,5 @@
 export { StdFee } from "@cosmjs/amino";
-export { Coin, coin, coins, parseCoins } from "@cosmjs/proto-signing";
+export { Coin, coin, coins, makeCosmoshubPath, parseCoins } from "@cosmjs/proto-signing";
 
 export { Account, accountFromAny } from "./accounts";
 export {