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

Ledger Casper integration

import { Observable } from "rxjs";
import { log } from "@ledgerhq/logs";
import { getAddress } from "../bridge/bridgeHelpers/addresses";
import { createNewTransaction } from "../bridge/bridgeHelpers/txn";
import { buildOptimisticOperation } from "./buildOptimisticOperation";
import { KeyAlgorithm } from "casper-js-sdk";
export const buildSignOperation = (signerContext) => ({ account, transaction, deviceId }) => new Observable(o => {
    async function main() {
        // log("debug", "[signOperation] start fn");
        const { recipient, amount, fees, transferId } = transaction;
        const { address, derivationPath } = getAddress(account);
        const casperTx = await createNewTransaction(address, recipient, amount, fees, transferId);
        // Serialize tx
        const txBytes = casperTx.toBytes();
        log("debug", `[signOperation] serialized transaction: [${txBytes.toString()}]`);
        o.next({
            type: "device-signature-requested",
        });
        // Sign by device
        const { r } = await signerContext(deviceId, async (signer) => {
            const r = await signer.sign(derivationPath, Buffer.from(txBytes));
            return { r };
        });
        o.next({
            type: "device-signature-granted",
        });
        // signature verification
        const txHash = casperTx.hash.getHash()?.toHex() ?? "";
        const signature = Buffer.concat([Buffer.from([KeyAlgorithm.SECP256K1]), r.signatureRS]);
        const operation = buildOptimisticOperation(account, transaction, txHash);
        const txJson = casperTx.toJSON();
        o.next({
            type: "signed",
            signedOperation: {
                operation,
                signature: Buffer.from(signature).toString("hex"),
                rawData: {
                    tx: JSON.stringify(txJson),
                },
            },
        });
    }
    main().then(() => o.complete(), e => o.error(e));
});
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