@metamask/snaps-simulation/dist/middleware/engine.cjs

A simulation framework for MetaMask Snaps, enabling headless testing of Snaps in a controlled environment

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.createJsonRpcEngine = void 0;
const eth_json_rpc_middleware_1 = require("@metamask/eth-json-rpc-middleware");
const json_rpc_engine_1 = require("@metamask/json-rpc-engine");
const snaps_rpc_methods_1 = require("@metamask/snaps-rpc-methods");
const internal_methods_1 = require("./internal-methods/index.cjs");
const mock_1 = require("./mock.cjs");
const constants_1 = require("../constants.cjs");
/**
 * Create a JSON-RPC engine for use in a simulated environment. This engine
 * should be used to handle all JSON-RPC requests. It is set up to handle
 * requests that would normally be handled internally by the MetaMask client, as
 * well as Snap-specific requests.
 *
 * @param options - The options to use when creating the engine.
 * @param options.store - The Redux store to use.
 * @param options.restrictedHooks - Any hooks used by the middleware handlers.
 * @param options.permittedHooks - Any hooks used by the middleware handlers.
 * @param options.permissionMiddleware - The permission middleware to use.
 * @param options.endpoint - The JSON-RPC endpoint to use for Ethereum requests.
 * @returns A JSON-RPC engine.
 */
function createJsonRpcEngine({ store, restrictedHooks, permittedHooks, permissionMiddleware, endpoint = constants_1.DEFAULT_JSON_RPC_ENDPOINT, }) {
    const engine = new json_rpc_engine_1.JsonRpcEngine();
    engine.push((0, mock_1.createMockMiddleware)(store));
    // The hooks here do not match the hooks used by the clients, so this
    // middleware should not be used outside of the simulation environment.
    engine.push((0, internal_methods_1.createInternalMethodsMiddleware)(restrictedHooks));
    engine.push((0, snaps_rpc_methods_1.createSnapsMethodMiddleware)(true, permittedHooks));
    engine.push(permissionMiddleware);
    engine.push((0, eth_json_rpc_middleware_1.createFetchMiddleware)({
        btoa: globalThis.btoa,
        fetch: globalThis.fetch,
        rpcUrl: endpoint,
    }));
    return engine;
}
exports.createJsonRpcEngine = createJsonRpcEngine;
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