@okta/okta-auth-js/esm/browser/oidc/util/pkce.js

The Okta Auth SDK

/*!
 * Copyright (c) 2015-present, Okta, Inc. and/or its affiliates. All rights reserved.
 * The Okta software accompanied by this notice is provided pursuant to the Apache License, Version 2.0 (the "License.")
 *
 * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * 
 * See the License for the specific language governing permissions and limitations under the License.
 */

import { stringToBase64Url } from '../../crypto/base64.js';
import { webcrypto as c } from '../../crypto/browser.js';
import { DEFAULT_CODE_CHALLENGE_METHOD, MIN_VERIFIER_LENGTH, MAX_VERIFIER_LENGTH } from '../../constants.js';

function dec2hex(dec) {
    return ('0' + dec.toString(16)).substr(-2);
}
function getRandomString(length) {
    var a = new Uint8Array(Math.ceil(length / 2));
    c.getRandomValues(a);
    var str = Array.from(a, dec2hex).join('');
    return str.slice(0, length);
}
function generateVerifier(prefix) {
    var verifier = prefix || '';
    if (verifier.length < MIN_VERIFIER_LENGTH) {
        verifier = verifier + getRandomString(MIN_VERIFIER_LENGTH - verifier.length);
    }
    return encodeURIComponent(verifier).slice(0, MAX_VERIFIER_LENGTH);
}
function computeChallenge(str) {
    var buffer = new TextEncoder().encode(str);
    return c.subtle.digest('SHA-256', buffer).then(function (arrayBuffer) {
        var hash = String.fromCharCode.apply(null, new Uint8Array(arrayBuffer));
        var b64u = stringToBase64Url(hash);
        return b64u;
    });
}
var PKCE = {
    DEFAULT_CODE_CHALLENGE_METHOD,
    generateVerifier,
    computeChallenge
};

export { PKCE as default };
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