azure-ad-auth-react-native
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An React Native module implements Azure AD V2.0 authentication flow
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<h1 class="page-title">token/token.js</h1>
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<pre class="prettyprint source linenums"><code>import { Base64 } from '../../node_modules/js-base64/base64'
import log from '../utils/logger'
function base64DecodeStringUrlSafe(base64IdToken) {
return decodeURIComponent(Base64.decode(base64IdToken))
}
function isEmptyString(str) {
return (typeof str === 'undefined' || !str || 0 === str.length)
}
/**
* Decode ID token from
*
* @param {string} encoded IdToken string
* @returns {Object | null} - in cas of error null is returned
*/
export function extractIdToken(encodedIdToken) {
// id token will be decoded to get the username
const decodedToken = _decodeJwt(encodedIdToken)
if (!decodedToken) {
return null
}
try {
const base64IdToken = decodedToken.JWSPayload
const base64Decoded = base64DecodeStringUrlSafe(base64IdToken)
if (!base64Decoded) {
log.info('The returned id_token could not be base64 url safe decoded.')
return null
}
return JSON.parse(base64Decoded)
} catch (err) {
log.error('The returned id_token could not be decoded', err)
}
return null
}
function _decodeJwt(jwtToken) {
if (isEmptyString(jwtToken)) {
return null
}
const idTokenPartsRegex = /^([^.\s]*)\.([^.\s]+)\.([^.\s]*)$/
const matches = idTokenPartsRegex.exec(jwtToken)
if (!matches || matches.length < 4) {
log.warn('The returned id_token is not parseable.')
return null
}
const crackedToken = {
header: matches[1],
JWSPayload: matches[2],
JWSSig: matches[3]
}
return crackedToken
}</code></pre>
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