ic-websocket-js/lib/esm/agent/transforms.js

IC WebSocket on the Internet Computer

import { makeNonce } from '@dfinity/agent';
/**
 * Create a Nonce transform, which takes a function that returns a Buffer, and adds it
 * as the nonce to every call requests.
 * @param nonceFn A function that returns a buffer. By default uses a semi-random method.
 */
export function makeWsNonceTransform(nonceFn = makeNonce) {
    return async (request) => {
        // Nonce only needs to be inserted into the body for async calls, to prevent replay attacks.
        if (request.endpoint === "call" /* Endpoint.Call */) {
            request.message.nonce = nonceFn();
        }
    };
}
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