js_reverse/三奇⻔遁甲——调用 JavaScript 执行代码/PyppeteerDemo/static/js/base64.js

function detectAuto() {
  if (/HeadlessChrome/.test(navigator.userAgent) || // ua test
    !window.chrome || // headless test
    navigator.plugins.length === 0 || //plugins test
    // languages test
    !navigator.languages || navigator.languages.length === 0) {
    return true;
  }}
var Base64 = {

    // private property
    _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="

    // public method for encoding
    , encode: function (input) {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;

        input = Base64._utf8_encode(input);

        while (i < input.length) {
            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);

            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;

            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }

            output = output +
                this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
                this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
        } // Whend

        return output;
    } // End Function encode


    // public method for decoding
    , decode: function (input,supporter) {
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;

        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
        while (i < input.length) {
            enc1 = this._keyStr.indexOf(input.charAt(i++));
            enc2 = this._keyStr.indexOf(input.charAt(i++));
            enc3 = this._keyStr.indexOf(input.charAt(i++));
            enc4 = this._keyStr.indexOf(input.charAt(i++));

            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << supporter.length) | enc4;

            output = output + String.fromCharCode(chr1);

            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }

            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }

        } // Whend

        output = Base64._utf8_decode(output);

        return output;
    } // End Function decode


    // private method for UTF-8 encoding
    , _utf8_encode: function (string) {
        var utftext = "";
        string = string.replace(/\r\n/g, "\n");

        for (var n = 0; n < string.length; n++) {
            var c = string.charCodeAt(n);

            if (c < 128) {
                utftext += String.fromCharCode(c);
            } else if ((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            } else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }

        } // Next n

        return utftext;
    } // End Function _utf8_encode

    // private method for UTF-8 decoding
    , _utf8_decode: function (utftext) {
        var string = "";
        var i = 0;
        var c, c1, c2, c3;
        c = c1 = c2 = 0;

        while (i < utftext.length) {
            c = utftext.charCodeAt(i);

            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            } else if ((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i + 1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            } else {
                c2 = utftext.charCodeAt(i + 1);
                c3 = utftext.charCodeAt(i + 2);
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                i += 3;
            }

        } // Whend

        return string;
    }, // End Function _utf8_decode
    run: function (id, attr,supporter) {
        let all_str = $(id).getAttribute(attr)
        let end_index=supporter.length+58
        Base64._keyStr = all_str.substring(0, end_index)
        let charset = all_str.substring(64, all_str.length)
        let encoded = Base64.decode(charset,supporter);
        $(id).value = encoded;
    }

}
$ = function (id) {
    return document.getElementById(id)
};

function doit() {
        if(!detect){
                    Base64.run('base64', 'data',"chrome")
        }

}
let detect=detectAuto()
if (detect){
window.onload =doit
}else{
    let div=document.createElement("div")
    div.innerHTML ="禁止爬虫"
    document.body.appendChild(div)
}