63 lines
2.0 KiB
TypeScript
63 lines
2.0 KiB
TypeScript
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export function buildDataString(assertedCredential: PublicKeyCredential) {
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const response = assertedCredential.response as AuthenticatorAssertionResponse;
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const authData = new Uint8Array(response.authenticatorData);
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const clientDataJSON = new Uint8Array(response.clientDataJSON);
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const rawId = new Uint8Array(assertedCredential.rawId);
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const sig = new Uint8Array(response.signature);
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const data = {
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id: assertedCredential.id,
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rawId: coerceToBase64Url(rawId),
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type: assertedCredential.type,
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extensions: assertedCredential.getClientExtensionResults(),
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response: {
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authenticatorData: coerceToBase64Url(authData),
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clientDataJson: coerceToBase64Url(clientDataJSON),
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signature: coerceToBase64Url(sig),
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},
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};
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return JSON.stringify(data);
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}
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export function b64Decode(str: string) {
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return decodeURIComponent(Array.prototype.map.call(atob(str), (c: string) => {
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return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
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}).join(''));
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}
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// From https://github.com/abergs/fido2-net-lib/blob/b487a1d47373ea18cd752b4988f7262035b7b54e/Demo/wwwroot/js/helpers.js#L34
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// License: https://github.com/abergs/fido2-net-lib/blob/master/LICENSE.txt
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function coerceToBase64Url(thing: any) {
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// Array or ArrayBuffer to Uint8Array
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if (Array.isArray(thing)) {
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thing = Uint8Array.from(thing);
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}
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if (thing instanceof ArrayBuffer) {
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thing = new Uint8Array(thing);
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}
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// Uint8Array to base64
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if (thing instanceof Uint8Array) {
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let str = '';
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const len = thing.byteLength;
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for (let i = 0; i < len; i++) {
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str += String.fromCharCode(thing[i]);
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}
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thing = window.btoa(str);
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}
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if (typeof thing !== 'string') {
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throw new Error('could not coerce to string');
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}
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// base64 to base64url
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// NOTE: "=" at the end of challenge is optional, strip it off here
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thing = thing.replace(/\+/g, '-').replace(/\//g, '_').replace(/=*$/g, '');
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return thing;
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}
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