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const fetch = require("node-fetch")
const cheerio = require("cheerio")
const jsonic = require("jsonic")
module.exports.search = (query, userAgent = "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:97.0) Gecko/20100101 Firefox/97.0") =>
fetch("https://www.google.com/search?tbm=isch&q=" + encodeURIComponent(query), {headers: {"User-Agent": userAgent}}).then(res => res.text()).then(data =>
cheerio.load(data, null, false) // parse HTML
("script") // find script tags
.toArray() // convert cheerio list to array
.map(script => script.children[0]?.data) // map script tags to their inline code
.filter(script => script?.startsWith("AF_initDataCallback")) // find script that contains init data
.map(script => script.slice("AF_initDataCallback(".length, -");".length)) // remove call to init function
.map(jsonic) // jsonic is used because JSON.parse() requires strict JSON and eval() allows remote code execution
.find(data => data.key == "ds:1") // for some reason there are two init datas, one is empty tho
.data[31][0][12][2].map(elem => elem[1] && new Object({ // map the parts of the init data we know/care about to something readable
image: {
url: elem[1][3][0],
size: {
width: elem[1][3][2],
height: elem[1][3][1],
},
},
preview: {
url: elem[1][2][0],
size: {
width: elem[1][2][2],
height: elem[1][2][1],
},
},
color: elem[1][6], // probably average color of the image (used as placeholder while loading the image)
link: elem[1][9][2003][2],
title: elem[1][9][2003][3], // there is some more data in elem[1][9] that could potentially be useful
}))
.filter(elem => elem)
)
module.exports.searchRandom = (query, userAgent) => module.exports.search(query, userAgent)
.then(results => results[Math.floor(Math.random() * results.length)])
/*
In case google makes changes, here are some snippets used to reverse engineer the format:
1. Find which script contains the init data (use the query astolfo+images for this)
-----------------------------------------------------------------------------------
scripts.find(script => script.search("https://steamcdn-a.akamaihd.net/steamcommunity/public/images/items/622220/f4d2d4074167411a7e15b9a845cf18b434c02af3.jpg") >= 0)
2. Reverse engineer format of init data passed to AF_initDataCallback
---------------------------------------------------------------------
const findStrings = (obj, path = "") => {
let found = []
for (k in obj) {
let v = obj[k]
let t = typeof v
let p = path + "." + k
if (t == "object")
found = found.concat(findStrings(v, p))
else if (t == "string")
found.push([v, p])
}
return found
}
console.log(findStrings(initData))
*/
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