@shane32/msoauth
Version:
A React library for Azure AD authentication with PKCE (Proof Key for Code Exchange) flow support. This library provides a secure and easy-to-use solution for implementing Azure AD authentication in React applications, with support for both API and Microso
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JavaScript
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/**
* Decodes a JWT token and returns its payload.
* @param {string} token - The JWT token to decode
* @returns {JwtPayload} The decoded JWT payload
*/
function jwtDecode(token) {
var base64Url = token.split(".")[1];
var base64 = base64Url.replace(/-/g, "+").replace(/_/g, "/");
return JSON.parse(atob(base64));
}
/**
* Generates a cryptographically secure random state string for OAuth authentication.
* Used to prevent CSRF attacks by ensuring the auth response matches the request.
* @returns {string} A base64url-encoded random string
*/
export function generateState() {
var array = new Uint8Array(32);
window.crypto.getRandomValues(array);
return bufferToBase64Url(array);
}
/**
* Generates PKCE codes for OAuth authorization code flow with PKCE.
* Creates a random code verifier and its corresponding SHA-256 hashed challenge.
* @returns {Promise<PKCECodes>} Object containing the code verifier and challenge
*/
export function generatePKCECodes() {
return __awaiter(this, void 0, void 0, function () {
var codeVerifier, encoder, data, hash, codeChallenge;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
codeVerifier = generateState();
encoder = new TextEncoder();
data = encoder.encode(codeVerifier);
return [4 /*yield*/, window.crypto.subtle.digest("SHA-256", data)];
case 1:
hash = _a.sent();
codeChallenge = bufferToBase64Url(new Uint8Array(hash));
return [2 /*return*/, { codeVerifier: codeVerifier, codeChallenge: codeChallenge }];
}
});
});
}
/**
* Converts a Uint8Array buffer to a base64url-encoded string.
* Base64url encoding is similar to base64 but uses URL-safe characters.
* @param {Uint8Array} buffer - The buffer to convert
* @returns {string} The base64url-encoded string
*/
export function bufferToBase64Url(buffer) {
// Convert buffer to base64
var base64 = btoa(String.fromCharCode.apply(null, Array.from(buffer)));
// Make base64URL by replacing chars that are different
return base64.replace(/\+/g, "-").replace(/\//g, "_").replace(/=/g, "");
}
/**
* Gets the current relative URL of the window, including path, search, and hash.
* @returns {string} The relative URL of the window
*/
export function getCurrentRelativeUrl() {
// Convert full URL to path for React navigation
var url = new URL(window.location.href);
return url.pathname + url.search + url.hash;
}
/**
* Extracts user information from a JWT token
* @param {string} idToken - The JWT token to decode
* @returns {UserInfo} The extracted user information
* @throws {Error} If required claims are missing from the token
*/
export function extractUserInfo(idToken) {
var decoded = jwtDecode(idToken);
if (!decoded.oid && !decoded.sub)
throw new Error("Both Object ID and Subject not found in token");
return __assign(__assign({}, decoded), { oid: decoded.oid || decoded.sub, roles: decoded.roles ? (Array.isArray(decoded.roles) ? decoded.roles : [decoded.roles]) : [] });
}
/**
* Extracts the expiration timestamp from a JWT token.
* @param {string} token - The JWT token to decode
* @returns {number} The expiration timestamp in milliseconds since Unix epoch
* @throws {Error} If the token doesn't contain an expiration claim
*/
export function extractTokenExpiration(token) {
if (!token) {
throw new Error("Token is empty");
}
var decoded = jwtDecode(token);
if (!decoded.exp) {
throw new Error("Token does not contain expiration claim");
}
// Convert from seconds to milliseconds
return decoded.exp * 1000;
}
/**
* Converts a TokenInfo from older versions to version 3
* @param {any} tokenData - The token data to convert
* @returns {TokenInfo} The converted token info
*/
export function convertTokenInfoToV3(tokenData) {
// Check if it's the old TokenInfoV1 format with apiAccessToken and msAccessToken
if (tokenData.version === 1 && "apiAccessToken" in tokenData && "msAccessToken" in tokenData) {
var v1Token = tokenData;
// Convert to version 3 format
return {
version: 3,
refreshToken: v1Token.refreshToken,
idToken: v1Token.idToken,
idTokenExpiresAt: v1Token.idToken ? extractTokenExpiration(v1Token.idToken) : 0,
accessTokens: {
// Map API token to default scope set
default: {
token: v1Token.apiAccessToken,
expiresAt: v1Token.apiExpiresAt,
},
// Map MS Graph token to ms scope set
ms: {
token: v1Token.msAccessToken,
expiresAt: v1Token.msExpiresAt,
},
},
};
}
// Check if it's version 2 format (missing idTokenExpiresAt)
if (tokenData.version === 2) {
return __assign(__assign({}, tokenData), { version: 3, idTokenExpiresAt: tokenData.idToken ? extractTokenExpiration(tokenData.idToken) : 0 });
}
// It's already version 3
return tokenData;
}