index.js

const axios = require("axios");
const cheerio = require('cheerio');
const fs = require('fs');
const request = require('request');
const mergeImg = require('merge-img');


const naverWebtoonDomain = 'https://comic.naver.com';

let searchUrl = naverWebtoonDomain + '/search.nhn?keyword=';

let webtoonName = process.argv[2];

if (!fs.existsSync(webtoonName)) {
    fs.mkdirSync(webtoonName);
}

let searchName = '';

for (let i = 0; i < webtoonName.length; i++) {
    if (i == webtoonName.length - 1) {
        searchName += webtoonName[i];
    } else {
        searchName += webtoonName[i] + '+';
    }
}


const getHtml = async (url) => {
    try {
        return await axios.get(url);
    } catch (error) {
        console.error(error);
    }
};

let searchKeywordUrl = searchUrl + encodeURI(searchName);

console.log(`searchKeywordUrl: ${searchKeywordUrl}`);

const saveImagesByChapter = async (webtoonUrl, chapter) => {
    await getHtml(webtoonUrl + '&no=' + chapter)
        .then(html => {
            let $ = cheerio.load(html.data);
            // #comic_view_area > div.wt_viewer > img:nth-child(1)
            let imageList = $("#comic_view_area > div.wt_viewer > img");

            console.log(`이미지갯수: ${imageList.length}`)

            if (!fs.existsSync(webtoonName + '/' + chapter)) {
                fs.mkdirSync(webtoonName + '/' + chapter);
            }

            imageList.each(function (idx, img) {
                let imageUrl = $(this).attr('src');
                console.log('웹툰 이미지 링크: ' + imageUrl);
                let imageFileName = webtoonName + '/' + chapter + '/' + idx + '.jpg';

                //image save
                request({ method: 'GET', uri: imageUrl, encoding: null, headers: { Referer: naverWebtoonDomain } }).pipe(fs.createWriteStream(imageFileName));
            })
        });
}

const crawler = async () => {
    let searchHtml = await getHtml(searchKeywordUrl);
    let $ = cheerio.load(searchHtml.data);

    const webtoonHref = $("#content > div:nth-child(2) > ul > li:nth-child(1) > h5 > a").attr('href');
    let webtoonUrl = naverWebtoonDomain + webtoonHref;

    console.log(`webtoonUrl: ${webtoonUrl}`);

    let webtoonListHtml = await getHtml(webtoonUrl);
    $ = cheerio.load(webtoonListHtml.data);

    const lastNoUrl = $("#content > table > tbody > tr:nth-child(2) > td.title > a").attr('href');
    // https://comic.naver.com/webtoon/detail.nhn?titleId=727189&no=10&weekday=fri

    let lastNo = lastNoUrl.split('no=')[1].replace(/[^0-9]/g, '');

    console.log(`lastNo: ${lastNo}`);

    webtoonUrl = webtoonUrl.replace('list.nhn', 'detail.nhn');

    let array = new Array(+lastNo);
    for(let i=1; i<=array.length; i++){
        await saveImagesByChapter(webtoonUrl, i);
        console.log(`chapter: ${i} Done`);
    }

    // merge image
    // let images = [];
    // images 넣기
    // let img = await mergeImg(images, { direction: true });
    // let img = await mergeImg(['1-0.jpg', '1-1.jpg', '1-2.jpg', '1-3.jpg', '1-4.jpg', '1-5.jpg', '1-6.jpg'], { direction: true });
    // img.write('1.jpg', ()=>{console.log('done')});

}

crawler();