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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;
}
/**
* Naively attempt to access Crypto as a global object, which popular alternative run-times
* support.
*/
const _globalThisCrypto = _getWebCryptoInternals.stubThisGlobalThisCrypto();
if (_globalThisCrypto) {
webCrypto = _globalThisCrypto;
return webCrypto;
}
/**
* `globalThis.crypto` isn't available, so attempt a Node import...
*/
const _nodeCrypto = await _getWebCryptoInternals.stubThisImportNodeCrypto();
if (_nodeCrypto?.webcrypto) {
webCrypto = _nodeCrypto.webcrypto as Crypto;
return webCrypto;
}
// We tried to access it both in Node and globally, so bail out
throw new MissingWebCrypto();
}
export class MissingWebCrypto extends Error {
constructor() {
const message = 'An instance of the Crypto API could not be located';
super(message);
this.name = 'MissingWebCrypto';
}
}
// Make it possible to stub return values during testing
export const _getWebCryptoInternals = {
stubThisImportNodeCrypto: async () => {
try {
// dnt-shim-ignore
/**
* The `webpackIgnore` here is to help support Next.js' Edge runtime.
* See https://github.com/MasterKale/SimpleWebAuthn/issues/517 for more info.
*/
const _nodeCrypto = await import(/* webpackIgnore: true */ 'node:crypto');
return _nodeCrypto;
} catch (_err) {
/**
* Intentionally declaring webcrypto as undefined because we're assuming the Node import
* failed due to either:
* - `import()` isn't supported
* - `node:crypto` is unavailable.
*/
return { webcrypto: undefined };
}
},
stubThisGlobalThisCrypto: () => globalThis.crypto,
// Make it possible to reset the `webCrypto` at the top of the file
setCachedCrypto: (newCrypto: Crypto | undefined) => {
webCrypto = newCrypto;
},
};
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