'use strict'
/**
Module to extract data from the 'request' object.
* @module request
*/
/** Extracts the specified parameter from the supplied request object.
* @param {Object} request The request object sent with the client request.
* @param {String} header The header to extract.
* @returns {String} the value of the request header key.
* @throws {Error} if the request header key does not exist.
*/
exports.getHeader = (request, header) => {
if (request.headers === undefined || request.headers[header] === undefined)
throw new Error('request header missing')
return request.headers[header]
}
/** Extracts the specified parameter from the supplied request object.
* @param {Object} request The request object sent with the client request.
* @param {String} param The parameter to extract.
* @returns {String} the value of the parameter.
* @throws {Error} if the parameter does not exist.
*/
exports.getParameter = (request, param) => {
if (request.params === undefined || request.params[param] === undefined)
throw new Error('parameter missing')
return request.params[param]
}
/** Extracts the value of the specified body key
* from the supplied request object.
* @param {Object} request The request object sent with the client request.
* @param {String} key The parameter to extract.
* @returns {String} the value of the key.
* @throws {Error} if the key does not exist.
*/
exports.extractBodyKey = (req, key) => {
if (req.body === undefined || req.body[key] === undefined)
throw new Error('missing key in request body')
return req.body[key]
}
/** Extracts the username and password passed in the HTTP request.
* @param {Object} request The request object sent by the client.
* @returns {Object} An object with the supplied username and password.
* @throws {Error} if the username and/or password are missing.
*/
exports.getCredentials = (request) => {
if (request.authorization === undefined || request.authorization.basic === undefined)
throw new Error('authorization header missing')
const auth = request.authorization.basic
Eif (auth.username === undefined || auth.password === undefined)
throw new Error('missing username and/or password')
return {username: auth.username, password: auth.password}
}
/** Replaces the host URL in the data.
* @param {Object} request The data from the Google API call.
* @returns {Object} The data with the correct URL.
*/
exports.replaceHostname = (req, data) => {
const host = req.headers.host || 'http://localhost'
const clean = data.items.map( element => {
const isbnData = element.volumeInfo.industryIdentifiers
let a = undefined
Iif (Object.prototype.toString.call(isbnData) === '[object Array]') {
a = isbnData.find( element => element.type === 'ISBN_10' )
const book = {
title: element.volumeInfo.title,
isbn: a.identifier,
link: `http://${host}/books/${a.identifier}`
}
return book
}
})
return {books: clean}
}
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