98 lines
2.4 KiB
TypeScript
98 lines
2.4 KiB
TypeScript
// Copyright © 2021 Aravinth Manivnanan <realaravinth@batsense.net>.
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// SPDX-FileCopyrightText: 2023 Aravinth Manivannan <realaravinth@batsense.net>
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//
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// SPDX-License-Identifier: MIT OR Apache-2.0
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import { stepped_gen_pow } from "@mcaptcha/pow-wasm";
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import * as p from "@mcaptcha/pow_sha256-polyfill";
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import { WasmWork, PoWConfig, SubmitWork } from "./types";
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/**
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* proove work
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* @param {PoWConfig} config - the proof-of-work configuration using which
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* work needs to be computed
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* */
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const prove = async (
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config: PoWConfig,
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progress: (nonce: number) => void
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): Promise<SubmitWork> => {
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const WASM = "wasm";
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const JS = "js";
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const STEPS = 5000;
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if (WasmSupported) {
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let proof: WasmWork = null;
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let res: SubmitWork = null;
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let time: number = null;
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const t0 = performance.now();
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const proofString = stepped_gen_pow(
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config.salt,
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config.string,
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config.difficulty_factor,
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STEPS,
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progress
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);
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const t1 = performance.now();
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time = t1 - t0;
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proof = JSON.parse(proofString);
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const worker_type = WASM;
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res = {
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result: proof.result,
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nonce: proof.nonce,
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worker_type,
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time,
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};
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return res;
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} else {
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console.log("WASM unsupported, expect delay during proof generation");
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let proof: WasmWork = null;
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let time: number = null;
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let res: SubmitWork = null;
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const t0 = performance.now();
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proof = await p.stepped_generate_work(
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config.salt,
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config.string,
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config.difficulty_factor,
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STEPS,
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progress
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);
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const t1 = performance.now();
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time = t1 - t0;
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const worker_type = JS;
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res = {
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result: proof.result,
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nonce: proof.nonce,
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worker_type,
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time,
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};
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return res;
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}
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};
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// credits: @jf-bastien on Stack Overflow
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// https://stackoverflow.com/questions/47879864/how-can-i-check-if-a-browser-supports-webassembly
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const WasmSupported = (() => {
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try {
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if (
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typeof WebAssembly === "object" &&
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typeof WebAssembly.instantiate === "function"
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) {
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const module = new WebAssembly.Module(
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Uint8Array.of(0x0, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00)
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);
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if (module instanceof WebAssembly.Module)
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return new WebAssembly.Instance(module) instanceof WebAssembly.Instance;
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}
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} catch (e) {
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console.error(e);
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}
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return false;
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})();
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export default prove;
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