feat(xlm): add combine function

Signed-off-by: Stéphane Prohaszka <[email protected]>

libs/coin-modules/coin-stellar/src/api/index.integ.test.ts

@@ -46,17 +46,17 @@ describe("Stellar Api", () => {
     });
   });
 
-  // describe("lastBlock", () => {
-  //   it("returns last block info", async () => {
-  //     // When
-  //     const result = await module.lastBlock();
+  describe("lastBlock", () => {
+    it("returns last block info", async () => {
+      // When
+      const result = await module.lastBlock();
 
-  //     // Then
-  //     expect(result.hash).toBeDefined();
-  //     expect(result.height).toBeDefined();
-  //     expect(result.time).toBeInstanceOf(Date);
-  //   });
-  // });
+      // Then
+      expect(result.hash).toBeDefined();
+      expect(result.height).toBeDefined();
+      expect(result.time).toBeInstanceOf(Date);
+    });
+  });
 
   describe("getBalance", () => {
     it("returns a list regarding address parameter", async () => {

libs/coin-modules/coin-stellar/src/api/index.ts

@@ -2,23 +2,20 @@ import type { Api } from "@ledgerhq/coin-framework/api/index";
 import coinConfig, { type StellarConfig } from "../config";
 import {
   broadcast,
-  // combine,
+  combine,
   craftTransaction,
   // estimateFees,
   getBalance,
   listOperations,
   lastBlock,
-  // rawEncode,
 } from "../logic";
 
 export function createApi(config: StellarConfig): Api {
   coinConfig.setCoinConfig(() => ({ ...config, status: { type: "active" } }));
 
   return {
     broadcast,
-    combine: () => {
-      throw new Error("Method not supported");
-    },
+    combine: compose,
     craftTransaction: craft,
     estimateFees: () => Promise.reject(new Error("Method not supported")),
     getBalance,
@@ -66,3 +63,10 @@ async function craft(
   );
   return tx.xdr;
 }
+
+function compose(tx: string, signature: string, pubkey?: string): string {
+  if (!pubkey) {
+    throw new Error("Missing pubkey");
+  }
+  return combine(tx, signature, pubkey);
+}

libs/coin-modules/coin-stellar/src/logic/combine.ts

@@ -1,3 +1,13 @@
+import { Transaction as StellarSdkTransaction } from "@stellar/stellar-sdk";
 
-// export function combine(transaction: string, signature: string, publicKey?: string): string {
-// }
+// https://developers.stellar.org/docs/learn/encyclopedia/network-configuration/network-passphrases
+// Mainnet
+const NETWORK_PASSPHRASE = "Public Global Stellar Network ; September 2015";
+// Testnet
+// const NETWORK_PASSPHRASE = "Test SDF Network ; September 2015";
+
+export function combine(transaction: string, signature: string, publicKey: string): string {
+  const unsignedTx = new StellarSdkTransaction(transaction, NETWORK_PASSPHRASE);
+  unsignedTx.addSignature(publicKey, signature);
+  return unsignedTx.toXDR();
+}

libs/coin-modules/coin-stellar/src/logic/index.ts

@@ -1,5 +1,5 @@
 export { broadcast } from "./broadcast";
-// export { combine } from "./combine";
+export { combine } from "./combine";
 export { craftTransaction } from "./craftTransaction";
 // export { estimateFees } from "./estimateFees";
 export { getBalance } from "./getBalance";