Function applyClientAuthentication

src/client/auth.ts:316–337

* Applies client authentication to the request based on the specified method. * * Implements OAuth 2.1 client authentication methods: * - client_secret_basic: HTTP Basic authentication (RFC 6749 Section 2.3.1) * - client_secret_post: Credentials in request body (RFC 6749 Section 2.3.1) * - none

(
    method: ClientAuthMethod,
    clientInformation: OAuthClientInformation,
    headers: Headers,
    params: URLSearchParams
)

 * @throws {Error} When required credentials are missing
 */
function applyClientAuthentication(
    method: ClientAuthMethod,
    clientInformation: OAuthClientInformation,
    headers: Headers,
    params: URLSearchParams
): void {
    const { client_id, client_secret } = clientInformation;

    switch (method) {
        case 'client_secret_basic':
            applyBasicAuth(client_id, client_secret, headers);
            return;
        case 'client_secret_post':
            applyPostAuth(client_id, client_secret, params);
            return;
        case 'none':
            applyPublicAuth(client_id, params);
            return;
        default:
            throw new Error(`Unsupported client authentication method: ${method}`);
    }
}

/**
 * Applies HTTP Basic authentication (RFC 6749 Section 2.3.1)