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import type { Crypto } from "../../../deps.ts";
let webCrypto: Crypto | undefined = undefined;
/**
* Try to get an instance of the Crypto API from the current runtime. Should support Node,
* as well as others, like Deno, that implement Web APIs.
*/
export async function getWebCrypto(): Promise<Crypto> {
if (webCrypto) {
return webCrypto;
}
try {
/**
* Naively attempt a Node import...
*/
// @ts-ignore: We'll handle any errors...
// dnt-shim-ignore
const _crypto = await require("node:crypto");
webCrypto = _crypto as unknown as Crypto;
} catch (_err) {
/**
* Naively attempt to access Crypto as a global object, which popular alternative run-times
* support.
*/
// @ts-ignore: ...right here.
const _crypto: Crypto = globalThis.crypto;
if (!_crypto) {
// We tried to access it both in Node and
throw new MissingWebCrypto();
}
webCrypto = _crypto;
}
return webCrypto;
}
class MissingWebCrypto extends Error {
constructor() {
const message = "An instance of the Crypto API could not be located";
super(message);
this.name = "MissingWebCrypto";
}
}
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