松島Extension

contentScript.js

(() => {

    if (document.body.innerText.indexOf('あそびすぎ') != -1) {
        console.log('あそびすぎ')
        setTimeout(function () {
            location.reload()
        }, 1000);
        return
    }

    if (document.body.innerText.indexOf('502 Bad Gateway') != -1) {
        console.log('502 Bad Gateway')
        setTimeout(function () {
            location.reload()
        }, 1000);
        return
    }

    if (document.body.innerText.indexOf('残念！') != -1) {
        console.log('残念！')
        document.querySelector('body > div > main > div > div > form > div:nth-child(3) > div > input').click()
        return
    }

    if (document.body.innerText.indexOf('SECCON') != -1) {
        console.log(document.body.innerText)
        alert('flag found')
        return
    }

    function getfilenum(num) {
        return document.querySelector(`body > div > main > div > div > form > div:nth-child(2) > div:nth-child(${num}) > img`).src.split('/').pop().split('.')[0]
    }

    function getcardnum(num) {
        return Math.floor(num / 4) + 2
    }

    function mode(array) {
        if (array.length == 0)
            return null;
        var modeMap = {};
        var maxEl = array[0], maxCount = 1;
        for (var i = 0; i < array.length; i++) {
            var el = array[i];
            if (modeMap[el] == null)
                modeMap[el] = 1;
            else
                modeMap[el]++;
            if (modeMap[el] > maxCount) {
                maxEl = el;
                maxCount = modeMap[el];
            }
        }
        return maxEl;
    }

    function check(num) {
        document.querySelector(`body > div > main > div > div > form > div:nth-child(3) > div:nth-child(${num}) > input[type="checkbox"]`).checked = true
        console.log('checked', num)
    }

    let fnum = [getfilenum(1), getfulenum(2), getfulenum(3), getfulenum(4), getfulenum(5)]
    let cnum = fnum.map(getcardnum)
    m = mode(cnum)

    console.log(fnum, cnum, m)

    if (cnum[0] != m) check(1)
    if (cnum[1] != m) check(2)
    if (cnum[2] != m) check(3)
    if (cnum[3] != m) check(4)
    if (cnum[4] != m) check(5)

    document.querySelector('body > div > main > div > div > form > div:nth-child(4) > div > input.btn.btn-success').click()
})()

manifest.json

{
    "name": "Getting Started Example",
    "version": "1.0",
    "description": "Build an Extension!",
    "manifest_version": 2,
    "content_scripts": [
        {
            "matches": [
                "http://matsushima.pwn.ja.seccon/play*",
                "http://matsushima.pwn.ja.seccon/draw"
            ],
            "js": [
                "contentScript.js"
            ]
        }
    ]
}