Lightsaber Escape QR Code Display

Adds a QR Code of the "lightsaber URL" to the front page of Lightsaber Escape
当前为 2016-01-25 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name          Lightsaber Escape QR Code Display
// @namespace     DoomTay
// @description   Adds a QR Code of the "lightsaber URL" to the front page of Lightsaber Escape
// @version       1.0.0
// @include       https://lightsaber.withgoogle.com/
// @grant         GM_xmlhttpRequest

// ==/UserScript==

var mobileCheck = setInterval(findMobileURL, 1000);

function findMobileURL()
{
    if(document.getElementById("url") && document.getElementById("url").textContent.indexOf("g.co") > -1)
    {
        clearInterval(mobileCheck);
        lightsaberURL = document.getElementById("url");
        GM_xmlhttpRequest({
            method: "GET",
            url: "https://chart.googleapis.com/chart?chs=120x120&cht=qr&chl=" + lightsaberURL.textContent + "&chld=L|1&choe=UTF-8",
            overrideMimeType: "text/plain; charset=x-user-defined",
            onload: function(response) {
                var QRCode = document.createElement("img");
                QRCode.id = "LSCode";
                QRCode.src = "data:image/png;base64," + customBase64Encode(response.responseText);
                document.getElementsByClassName("centered")[0].insertBefore(QRCode,document.getElementsByClassName("connection-url-wrapper style-scope sw-page-landing")[0]);
                QRCode.width = 120;
                QRCode.height = 120;
                QRCode.style.position = "absolute";
                QRCode.style.left = "45%";
                QRCode.style.bottom = "-35px";
            }
        });
    }
}

function customBase64Encode (inputStr) {
    var
    bbLen               = 3,
        enCharLen           = 4,
        inpLen              = inputStr.length,
        inx                 = 0,
        jnx,
        keyStr              = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
    + "0123456789+/=",
        output              = "",
        paddingBytes        = 0;
    var
    bytebuffer          = new Array (bbLen),
        encodedCharIndexes  = new Array (enCharLen);

    while (inx < inpLen) {
        for (jnx = 0;  jnx < bbLen;  ++jnx) {
            /*--- Throw away high-order byte, as documented at:
              https://developer.mozilla.org/En/Using_XMLHttpRequest#Handling_binary_data
            */
            if (inx < inpLen)
                bytebuffer[jnx] = inputStr.charCodeAt (inx++) & 0xff;
            else
                bytebuffer[jnx] = 0;
        }

        /*--- Get each encoded character, 6 bits at a time.
            index 0: first  6 bits
            index 1: second 6 bits
                        (2 least significant bits from inputStr byte 1
                         + 4 most significant bits from byte 2)
            index 2: third  6 bits
                        (4 least significant bits from inputStr byte 2
                         + 2 most significant bits from byte 3)
            index 3: forth  6 bits (6 least significant bits from inputStr byte 3)
        */
        encodedCharIndexes[0] = bytebuffer[0] >> 2;
        encodedCharIndexes[1] = ( (bytebuffer[0] & 0x3) << 4)   |  (bytebuffer[1] >> 4);
        encodedCharIndexes[2] = ( (bytebuffer[1] & 0x0f) << 2)  |  (bytebuffer[2] >> 6);
        encodedCharIndexes[3] = bytebuffer[2] & 0x3f;

        //--- Determine whether padding happened, and adjust accordingly.
        paddingBytes          = inx - (inpLen - 1);
        switch (paddingBytes) {
            case 1:
                // Set last character to padding char
                encodedCharIndexes[3] = 64;
                break;
            case 2:
                // Set last 2 characters to padding char
                encodedCharIndexes[3] = 64;
                encodedCharIndexes[2] = 64;
                break;
            default:
                break; // No padding - proceed
        }

        /*--- Now grab each appropriate character out of our keystring,
            based on our index array and append it to the output string.
        */
        for (jnx = 0;  jnx < enCharLen;  ++jnx)
            output += keyStr.charAt ( encodedCharIndexes[jnx] );
    }
    return output;
}
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