modifyAssertion.md

Variable: modifyAssertion

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• const modifyAssertion: typeof oauth.modifyAssertion = oauth.modifyAssertion

Use to mutate JWT header and payload before they are signed. Its intended use is working around non-conform server behaviours, such as modifying JWT "aud" (audience) claims, or otherwise changing fixed claims used by this library.

Example

Changing the alg: "Ed25519" back to alg: "EdDSA"

let key!: client.CryptoKey | client.PrivateKey
let config!: client.Configuration
let parameters!: URLSearchParams
let keyPair!: client.CryptoKeyPair

let remapEd25519: client.ModifyAssertionOptions = {
  [client.modifyAssertion]: (header) => {
    if (header.alg === 'Ed25519') {
      header.alg = 'EdDSA'
    }
  },
}

// For JAR
client.buildAuthorizationUrlWithJAR(
  config,
  parameters,
  key,
  remapEd25519,
)

// For Private Key JWT
client.PrivateKeyJwt(key, remapEd25519)

// For DPoP
client.getDPoPHandle(config, keyPair, remapEd25519)