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module.exports = function(client, scope, audience, context, cb) { | |
const _ = require('lodash'); | |
let access_token = {}; | |
let requested_scopes = context.body.scope; | |
let jwt = require('jsonwebtoken'); | |
requested_scopes = (requested_scopes && requested_scopes.split(" ")) || []; | |
access_token.scope = _.intersection(requested_scopes, scope); | |
if (!context.body.identifier_token) { | |
return cb('No user identifier'); | |
} | |
const jwksClient = require('jwks-rsa'); | |
let clientKey = jwksClient({ | |
jwksUri: 'https://<<your_tenant>>.auth0.com/.well-known/jwks.json' | |
}); | |
function getKey(kid, callback) { | |
clientKey.getSigningKey(kid, function(err, key) { | |
if (err) { | |
return callback(err, null); | |
} | |
const signingKey = key.publicKey || key.rsaPublicKey; | |
callback(null, signingKey); | |
}); | |
} | |
function verify(id_token, signingKey, callback) { | |
jwt.verify(context.body.identifier_token, signingKey, { | |
algorithms: ['RS256'], audience: context.id, issuer: 'https://<<your_tenant>>.auth0.com/' | |
}, callback); | |
} | |
try { | |
if (audience === 'https://<<your_tenant>>.auth0.com/api/v2/') { // your tenant's Management API | |
console.log("id token", context.body.identifier_token); | |
let idtoken = jwt.decode(context.body.identifier_token, { | |
complete: true | |
}); | |
const kid = idtoken.header.kid; | |
getKey(kid, (err, signingKey) => { | |
if (err) { | |
return cb("Failed to get key"); | |
} | |
verify(context.body.identifier_token, signingKey, (error, decoded) => { | |
if (error) { | |
return cb('user Identifier token Failed Validation.'); | |
} | |
let namespace = 'http://management-api/'; | |
console.log("decoded token", decoded.sub); // you can check if the user is authorized to get the m2m token | |
access_token[namespace + 'delegateduser'] = decoded.sub; // if the returned M2M access_token requires user details for auditing. | |
/* Remove all the console logs */ | |
console.log("new access token", access_token); | |
console.log("user's id_token", context.body.identifier_token); | |
console.log("requested scope", context.body.scope); | |
console.log("all scopes agains API", scope); | |
console.log("intersection of scopes added in access_token", access_token.scope); | |
cb(null, access_token); | |
}) | |
}); | |
} else { | |
cb(null, access_token); | |
} | |
} catch (error) { | |
cb(error, null); | |
} | |
}; | |
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