simple script to download stories from that website http://manga.alphantom.com

alpantom_managa_downloader_script.js

/*
* by Davenchy
* you need to modify the code to download your story
*/
const http = require('http')
const fs = require('fs')
const path = require('path')

// get the page url
const getURL = (c, p, isJPG)  => `http://manga.alphantom.com/uploads/manga/ao-haru-ride/chapters/${c}/${fixPageNumber(p)}.${isJPG ? 'jpg' : 'png'}`;
// add zeros before the number if less than 10
const fixPageNumber = p => (p < 10 && p > 0 ? `0${p}` : p).toString();
// sometimes you will need a fixed addition even if less than 10 or not
// const fixPageNumber = p => `0${p}`

// get response object if the image exist in jpg or png ext.
function getRes (c, p) {
	return new Promise((resolve, reject) => {
		const jpg = getURL(c, p, true)
		const png = getURL(c, p, false)

		http.get(jpg, (res) => { if (res.statusCode === 200) {
						return resolve(res, true)
		} else {
			http.get(png, (res) => {
				if (res.statusCode === 200) {
					return resolve(res, false)
				} else { reject() }
			})
		} })
	})
}

// download image p from chapter c
function download(c, p) {
	return new Promise((resolve, reject) => {
		getRes(c, p).then((res, isJPG) => {
				const downloads = path.join(__dirname, 'downloads')
				const	dir = path.join(downloads, c.toString())
			  const name = path.join(dir, p.toString() + (isJPG ? '.jpg' : '.png'))

				if (!fs.existsSync(downloads)) fs.mkdirSync(downloads)
				if (!fs.existsSync(dir)) fs.mkdirSync(dir)

				const file = fs.createWriteStream(name)
			
			  res.pipe(file)

			  file.on('finish', () => resolve())
	
		}).catch(() => reject())
	})
}

// start downloading
// start from chapter a
// ent after chapter b
// mp is the maximum number of pages to download
async function start (a=0, b=0, mp=100) {
	for (let i = a - 1; i < b; i++) {
		const c = i + 1
			for (let p = 0; p < mp; p++) {
				try {
					await download(c, p + 1)
					console.log('downloaded: ', c, ':', p + 1)
				} catch (_) {
					console.log('failed to download: ', c, ':', p + 1)
				}
			}
	}
}

// start downloading chapter 5 only
(async function () { await start(5, 5) })()