| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| export let headersCallback = null; |
| |
| /** |
| * Fetches the most up-to-date custom headers object from the headers callback |
| * and updates the config object with the new value. |
| * @param {Object} config Configuration object to be updated. |
| * @param {Function} headersCallback Callback used to fetch the newest headers. |
| * @returns {void} |
| */ |
| export function updateCustomHeaders(config) { |
| if (headersCallback) { |
| try { |
| config.headers = headersCallback(); |
| } catch (e) { |
| // We should emit the error, but otherwise continue as this could be a temporary issue |
| // due to network connectivity or some logic inside the headersCallback which is the user's |
| // responsibility. |
| console.error(`Error encountered while setting the headers: ${e}`); |
| } |
| } |
| } |
| |
| /** |
| * Registers the provided callback to be used when updating the auth header. |
| * @param {Function} callback Callback used to fetch the newest headers. Should return an object. |
| * @returns {boolean} Whether the operation succeeded. |
| */ |
| export function registerHeadersCallback(callback) { |
| try { |
| verifyCallback(callback); |
| headersCallback = callback; |
| return true; |
| } catch (e) { |
| return false; |
| } |
| } |
| |
| /** |
| * Verify that the provided callback is a function which returns a string |
| * @param {Function} callback Callback used to fetch the newest header. Should return an object. |
| * @throws {Error} If the callback is not a function or does not return a string. |
| * @returns {void} |
| */ |
| export function verifyCallback(callback) { |
| if (typeof callback !== "function") { |
| throw new Error("Userale headers callback must be a function"); |
| } |
| const result = callback(); |
| if (typeof result !== "object") { |
| throw new Error("Userale headers callback must return an object"); |
| } |
| for (const [key, value] of Object.entries(result)) { |
| if (typeof key !== "string" || typeof value !== "string") { |
| throw new Error("Userale header callback must return an object with string keys and values"); |
| } |
| } |
| } |
| |
| /** |
| * Resets the authCallback to null. Used for primarily for testing, but could be used |
| * to remove the callback in production. |
| * @returns {void} |
| */ |
| export function resetHeadersCallback() { |
| headersCallback = null; |
| } |