Load pow-sha256 polyfill to support browsers that aren't capable of

executing WASM
This commit is contained in:
realaravinth 2021-12-08 14:52:06 +05:30
parent a075607bae
commit e399f82ac4
No known key found for this signature in database
GPG key ID: AD9F0F08E855ED88
5 changed files with 48 additions and 12 deletions

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@ -37,6 +37,7 @@
}, },
"dependencies": { "dependencies": {
"@mcaptcha/pow-wasm": "^0.1.0-alpha-1", "@mcaptcha/pow-wasm": "^0.1.0-alpha-1",
"@mcaptcha/pow_sha256-polyfill": "^0.1.0-alpha-1",
"mcaptcha-glue": "^0.1.0-alpha-1" "mcaptcha-glue": "^0.1.0-alpha-1"
} }
} }

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@ -10,6 +10,7 @@
*/ */
import { gen_pow } from "@mcaptcha/pow-wasm"; import { gen_pow } from "@mcaptcha/pow-wasm";
import * as p from "@mcaptcha/pow_sha256-polyfill";
import { WasmWork, PoWConfig } from "./types"; import { WasmWork, PoWConfig } from "./types";
/** /**
@ -17,15 +18,44 @@ import { WasmWork, PoWConfig } from "./types";
* @param {PoWConfig} config - the proof-of-work configuration using which * @param {PoWConfig} config - the proof-of-work configuration using which
* work needs to be computed * work needs to be computed
* */ * */
const prove = (config: PoWConfig): WasmWork => { const prove = async (config: PoWConfig): Promise<WasmWork> => {
const proofString = gen_pow( let proof: WasmWork = null;
config.salt, if (WasmSupported) {
config.string, const proofString = gen_pow(
config.difficulty_factor config.salt,
); config.string,
const proof: WasmWork = JSON.parse(proofString); config.difficulty_factor
);
proof = JSON.parse(proofString);
} else {
console.log("WASM unsupported, expect delay during proof generation");
proof = await p.generate_work(
config.salt,
config.string,
config.difficulty_factor
);
}
return proof; return proof;
}; };
// credits: @jf-bastien on Stack Overflow
// https://stackoverflow.com/questions/47879864/how-can-i-check-if-a-browser-supports-webassembly
const WasmSupported = (() => {
try {
if (
typeof WebAssembly === "object" &&
typeof WebAssembly.instantiate === "function"
) {
const module = new WebAssembly.Module(
Uint8Array.of(0x0, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00)
);
if (module instanceof WebAssembly.Module)
return new WebAssembly.Instance(module) instanceof WebAssembly.Instance;
}
} catch (e) {
console.error(e);
}
return false;
})();
export default prove; export default prove;

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@ -19,12 +19,12 @@ import { PoWConfig, ServiceWorkerWork } from "./types";
import log from "../logger"; import log from "../logger";
log.log("worker registered"); log.log("worker registered");
onmessage = (e) => { onmessage = async (e) => {
console.debug("message received at worker"); console.debug("message received at worker");
const config: PoWConfig = e.data; const config: PoWConfig = e.data;
const t0 = performance.now(); const t0 = performance.now();
const work = prove(config); const work = await prove(config);
const t1 = performance.now(); const t1 = performance.now();
const duration = t1 - t0; const duration = t1 - t0;

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@ -1,8 +1,8 @@
{ {
"compilerOptions": { "compilerOptions": {
"incremental": true, "incremental": true,
"target": "es5", "target": "es2020",
"module": "es6", "module": "es2020",
"allowJs": false, "allowJs": false,
"sourceMap": true, "sourceMap": true,
"outDir": "./static-assets/bundle", "outDir": "./static-assets/bundle",

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@ -538,6 +538,11 @@
resolved "https://registry.yarnpkg.com/@mcaptcha/pow-wasm/-/pow-wasm-0.1.0-alpha-1.tgz#ec3fac9d34b7b6436dec6597629501e524a8b702" resolved "https://registry.yarnpkg.com/@mcaptcha/pow-wasm/-/pow-wasm-0.1.0-alpha-1.tgz#ec3fac9d34b7b6436dec6597629501e524a8b702"
integrity sha512-0ym6kDkC7ilpp9AsK60qrpLGnqO78fYDzAypDaAqyw7uQDtg27VacYvGWt0RI3R2AnsYW6L5Q6wsd2WJDEzNmA== integrity sha512-0ym6kDkC7ilpp9AsK60qrpLGnqO78fYDzAypDaAqyw7uQDtg27VacYvGWt0RI3R2AnsYW6L5Q6wsd2WJDEzNmA==
"@mcaptcha/pow_sha256-polyfill@^0.1.0-alpha-1":
version "0.1.0-alpha-1"
resolved "https://registry.yarnpkg.com/@mcaptcha/pow_sha256-polyfill/-/pow_sha256-polyfill-0.1.0-alpha-1.tgz#d34ee78de39223416358c540af46ea863e4373c2"
integrity sha512-lnQNBCOnVI9BunHP8FGCsGs310GguQWdxSspXlvWcrLwgl86aq0hlBzZfOV+szG/jeTRAMry0He3MrD/kbqB/Q==
"@nodelib/fs.scandir@2.1.5": "@nodelib/fs.scandir@2.1.5":
version "2.1.5" version "2.1.5"
resolved "https://registry.yarnpkg.com/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz#7619c2eb21b25483f6d167548b4cfd5a7488c3d5" resolved "https://registry.yarnpkg.com/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz#7619c2eb21b25483f6d167548b4cfd5a7488c3d5"