@ledgerhq/coin-stellar/lib-es/bridge/signOperation.js

Ledger Stellar Coin integration

import { Observable } from "rxjs";
import { FeeNotLoaded } from "@ledgerhq/errors";
import { buildTransaction } from "./buildTransaction";
import { buildOptimisticOperation } from "./buildOptimisticOperation";
export function buildSignOperation(signerContext) {
    return function signOperation({ account, deviceId, transaction }) {
        return new Observable(obs => {
            let cancelled = false;
            async function main() {
                obs.next({ type: "device-signature-requested" });
                if (cancelled) {
                    return;
                }
                if (!transaction.fees) {
                    throw new FeeNotLoaded();
                }
                const unsigned = await buildTransaction(account, transaction);
                const unsignedPayload = Buffer.from(unsigned.signatureBase());
                // Sign by device
                const { signature } = await signerContext(deviceId, signer => signer.signTransaction(account.freshAddressPath, unsignedPayload));
                unsigned.addSignature(account.freshAddress, signature.toString("base64"));
                obs.next({
                    type: "device-signature-granted",
                });
                const operation = await buildOptimisticOperation(account, transaction);
                obs.next({
                    type: "signed",
                    signedOperation: {
                        operation,
                        signature: unsigned.toXDR(),
                    },
                });
            }
            main().then(() => obs.complete(), err => obs.error(err));
            return () => {
                cancelled = true;
            };
        });
    };
}
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