main.js

const host = {
    protocol: "http://",
    domain: "mod.a3sog.org",
    port: 80,
    path: "/SOG.zip",
    gameIP: "127.0.0.1",
    gamePORT: "2302"
}

ipcMain.on('download', (event, info) => {
    settingsData.arma3path = info.arma3path
    settings = JSON.stringify(settingsData)

    sfs.writeFile(sPath, settings, (e) => { if (e) throw e })

    let req = http.request({method: 'HEAD', host: host.domain, port: host.port, path: host.path}, (res) => {
        if (res.headers["last-modified"] != settingsData["last-modified"] || settingsData.version == "-1") {
            log.log("Mismatch: " + res.headers["last-modified"] + " != " + settingsData["last-modified"])
            settingsData["last-modified"] = res.headers["last-modified"]

            if (fs.existsSync(`${info.arma3path}\\SOG`)) {
                rimraf(`${info.arma3path}\\SOG`, (e) => { if (e) throw e })
            }

            download(BrowserWindow.getFocusedWindow(), host.protocol + host.domain + host.path, {
                directory: `${app.getPath("userData")}\\mods`, onProgress: (state) => win.webContents.send('dlProgress', state)
            }).then(dl => {
                let file = dl.getSavePath()

                extract(file, {dir: info.arma3path}, (e) => {
                    if (e) throw e
                }).then(function unlinkFile() {
                    fs.unlink(file, (e) => { if (e) throw e })
                }).then(function readWriteVersion() {
                    version = vfs.readFileSync(info.arma3path + "\\SOG\\Version")
                    settingsData.version = version.toString()
                    settings = JSON.stringify(settingsData)
                    vfs.writeFile(sPath, settings, (e) => { if (e) throw e })
                }).then(function sendComplete() {
                    win.webContents.send('dlComplete', {version: settingsData.version, ip: host.gameIP, port: host.gamePORT, join: info.join})
                })
            }).catch((e) => {
                if (e) log.log(e)
                dlServerUp = false
                win.webContents.send('serverDown', {download: true})
            })
        } else {
            log.log("No Mismatch Found")
            win.webContents.send('dlComplete', {version: settingsData.version, ip: host.gameIP, port: host.gamePORT, join: info.join})
        }
    })

    req.on('abort', (e) => {
        if (e) log.log(e)
        dlServerUp = false
        win.webContents.send('serverDown', {download: true})
    })

    req.on('error', (e) => {
        if (e) log.log(e)
        dlServerUp = false
        win.webContents.send('serverDown', {download: true})
    })

    req.end()
})