@ledgerhq/hw-app-canton/lib-es/splitTransaction.js

Ledger Hardware Wallet Canton Application API

import { encodeDamlTransaction, encodeInputContract, encodeMetadata, encodeNode, } from "./encodeTransaction";
/**
 * Splits a Canton transaction into components for prepared transaction signing.
 * Converts protobuf transaction data into structured components that can be
 * sent to the Ledger device for signing.
 *
 * @param transaction - The transaction JSON structure from the Gateway API
 * @returns Prepared transaction components ready for device signing
 */
export function splitTransaction(transaction) {
    const { transaction: transactionData, metadata } = transaction;
    // Process DAML transaction
    const damlTransactionBytes = encodeDamlTransaction(transactionData);
    // Process input contracts
    const inputContracts = (metadata.inputContracts || []).map((contract) => encodeInputContract(contract));
    // Process metadata
    const metadataBytes = encodeMetadata(metadata, inputContracts.length);
    // Process nodes
    const nodesArray = transactionData.nodes || [];
    const nodes = new Array(nodesArray.length);
    const lastIndex = nodesArray.length - 1;
    for (const node of nodesArray) {
        const nodeId = Number.parseInt(node.nodeId || "0", 10);
        const nodeBytes = encodeNode(node);
        const pos = lastIndex - nodeId;
        nodes[pos] = nodeBytes;
    }
    return {
        damlTransaction: damlTransactionBytes,
        nodes,
        metadata: metadataBytes,
        inputContracts,
    };
}
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