@wordpress/api-fetch/build-module/middlewares/nonce.js

Utility to make WordPress REST API requests.

/**
 * @param {string} nonce
 * @return {import('../types').APIFetchMiddleware & { nonce: string }} A middleware to enhance a request with a nonce.
 */
function createNonceMiddleware(nonce) {
  /**
   * @type {import('../types').APIFetchMiddleware & { nonce: string }}
   */
  const middleware = (options, next) => {
    const {
      headers = {}
    } = options;

    // If an 'X-WP-Nonce' header (or any case-insensitive variation
    // thereof) was specified, no need to add a nonce header.
    for (const headerName in headers) {
      if (headerName.toLowerCase() === 'x-wp-nonce' && headers[headerName] === middleware.nonce) {
        return next(options);
      }
    }
    return next({
      ...options,
      headers: {
        ...headers,
        'X-WP-Nonce': middleware.nonce
      }
    });
  };
  middleware.nonce = nonce;
  return middleware;
}
export default createNonceMiddleware;
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