@azure/msal-browser/src/utils/BrowserProtocolUtils.ts

Microsoft Authentication Library for js

/*
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */

import { InteractionType } from "./BrowserConstants.js";
import {
    ICrypto,
    RequestStateObject,
    ProtocolUtils,
    createClientAuthError,
    ClientAuthErrorCodes,
} from "@azure/msal-common/browser";

export type BrowserStateObject = {
    interactionType: InteractionType;
};

/**
 * Extracts the BrowserStateObject from the state string.
 * @param browserCrypto
 * @param state
 */
export function extractBrowserRequestState(
    browserCrypto: ICrypto,
    state: string,
    correlationId: string
): BrowserStateObject | null {
    if (!state) {
        return null;
    }

    try {
        const requestStateObj: RequestStateObject =
            ProtocolUtils.parseRequestState(
                browserCrypto.base64Decode,
                state,
                correlationId
            );
        return requestStateObj.libraryState.meta as BrowserStateObject;
    } catch (e) {
        throw createClientAuthError(
            ClientAuthErrorCodes.invalidState,
            correlationId
        );
    }
}