BooksAPI.js

/**
 * This file contain some functions to interact with the Book Lender API provided by Udacity.
 *
 * From the URL https://reactnd-books-api.udacity.com follows the API calls specs:
 *
 * Use an Authorization header to work with your own data:
 *
 * fetch(url, { headers: { 'Authorization': 'whatever-you-want' }})
 *
 * The following endpoints are available:
 *
 * GET /status
 * GET /books
 * GET /books/:id
 * PUT /books/:id { shelf }
 * POST /search { query, maxResults }
 */
import * as BookUtils from './BookUtils';

const api = "https://reactnd-books-api.udacity.com";

// Generate a unique token for retrieving get one book API call since it doesn't need the any user related data
// a not logged user could access it.
let token = localStorage.token;
if (!token)
	token = Math.random().toString(36).substr(-8);

const headers = {
	'Accept': 'application/json',
	'Authorization': token,
};

/**
 * @description Returns the details of a book. Implement the API call GET /books/:id. Note: this is the only function
 * that use token randomly generated by this script instead of the user address because the BookInfo components
 * that uses this function needs to request data for logged and not logged users.
 * @param {string} bookId - The id of the book.
 * @returns {Promise.object} The book object if successfully or an object with errorCode key with the http status error.
 */
export const get = (bookId) =>
	fetch(`${api}/books/${bookId}`, {headers})
		.then(res => {
			if (res.status !== 200) {
				return res;
			}
			return res.json();
		})
		.then(data => {
			// Only happen if status is 200
			if (data.book) {
				return data.book;
			}
			// Return the object with with http status (error code)
			return {errorCode: data.status};
		});

/**
 * @description Get all classified books (books with shelf data) available for a particular address. Implements the call
 * to API GET /books.
 * @returns {Promise.array}	Array of book objects (same book object returned by get()).
 */
export const getAll = () => {
	const headers = BookUtils.getAccountHeaders();
	return fetch(`${api}/books`, {headers})
		.then(res => res.json())
		.then(data => data.books);
};

/**
 * @description Update a book with the informed shelf. Implements the call PUT /books/:id { shelf }.
 * @param {object} book - The book object (same object returned at get() and getAll()).
 * @param {string} shelf - The shelf ID (only available.
 */
export const update = (book, shelf) =>
	fetch(`${api}/books/${book.id}`, {
		method: 'PUT',
		headers: {
			...BookUtils.getAccountHeaders(),
			'Content-Type': 'application/json'
		},
		body: JSON.stringify({shelf})
	}).then(res => res.json());

/**
 * @description Search books that contains a particular query term. Implements the call POST /search {query, maxResults}
 * Note: The backend API uses a fixed set of cached search results and is limited to a particular set of search terms,
 * which can be found in ./SEARCH_TERMS.md.
 * @param {string} query - The search terms.
 * @param {number} maxResults - Due to the nature of the backend server, search results are capped at 20, even if this
 * is set higher.
 */
export const search = (query, maxResults) =>
	fetch(`${api}/search`, {
		method: 'POST',
		headers: {
			...BookUtils.getAccountHeaders(),
			'Content-Type': 'application/json'
		},
		body: JSON.stringify({query, maxResults})
	}).then(res => res.json())
		.then(data => data.books);