/*
|
* Copyright (c) Microsoft Corporation. All rights reserved.
|
* Licensed under the MIT License.
|
*/
|
|
import { RESOURCE_DELIM } from "./Constants.js";
|
import { ICrypto } from "../crypto/ICrypto.js";
|
import {
|
ClientAuthErrorCodes,
|
createClientAuthError,
|
} from "../error/ClientAuthError.js";
|
import { LibraryStateObject, RequestStateObject } from "./StateTypes.js";
|
|
/**
|
* Appends user state with random guid, or returns random guid.
|
* @param cryptoObj
|
* @param userState
|
* @param meta
|
*/
|
export function setRequestState(
|
cryptoObj: ICrypto,
|
userState?: string,
|
meta?: Record<string, string>
|
): string {
|
const libraryState = generateLibraryState(cryptoObj, meta);
|
return userState
|
? `${libraryState}${RESOURCE_DELIM}${userState}`
|
: libraryState;
|
}
|
|
/**
|
* Generates the state value used by the common library.
|
* @param cryptoObj
|
* @param meta
|
*/
|
export function generateLibraryState(
|
cryptoObj: ICrypto,
|
meta?: Record<string, string>
|
): string {
|
if (!cryptoObj) {
|
throw createClientAuthError(ClientAuthErrorCodes.noCryptoObject);
|
}
|
|
// Create a state object containing a unique id and the timestamp of the request creation
|
const stateObj: LibraryStateObject = {
|
id: cryptoObj.createNewGuid(),
|
};
|
|
if (meta) {
|
stateObj.meta = meta;
|
}
|
|
const stateString = JSON.stringify(stateObj);
|
|
return cryptoObj.base64Encode(stateString);
|
}
|
|
/**
|
* Parses the state into the RequestStateObject, which contains the LibraryState info and the state passed by the user.
|
* @param base64Decode
|
* @param state
|
*/
|
export function parseRequestState(
|
base64Decode: (input: string) => string,
|
state: string
|
): RequestStateObject {
|
if (!base64Decode) {
|
throw createClientAuthError(ClientAuthErrorCodes.noCryptoObject);
|
}
|
|
if (!state) {
|
throw createClientAuthError(ClientAuthErrorCodes.invalidState);
|
}
|
|
try {
|
// Split the state between library state and user passed state and decode them separately
|
const splitState = state.split(RESOURCE_DELIM);
|
const libraryState = splitState[0];
|
const userState =
|
splitState.length > 1
|
? splitState.slice(1).join(RESOURCE_DELIM)
|
: "";
|
const libraryStateString = base64Decode(libraryState);
|
const libraryStateObj = JSON.parse(
|
libraryStateString
|
) as LibraryStateObject;
|
return {
|
userRequestState: userState || "",
|
libraryState: libraryStateObj,
|
};
|
} catch (e) {
|
throw createClientAuthError(ClientAuthErrorCodes.invalidState);
|
}
|
}
|