// ==UserScript==
// @name         防 Claude 检测（模拟新加坡）
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  伪装新加坡浏览器：隐藏中文字体 + 伪造区域 + 指纹噪声
// @author       aidenlee 
// @match        *://*/*
// @run-at       document-start
// @grant        none
// @license MIT
// ==/UserScript==

(function() {
    'use strict';

    // ============================================================
    // 第一部分：伪造 navigator 和 Intl 为新加坡 / English (Singapore)
    // ============================================================

    // --- 伪造 navigator.language 和 languages ---
    try {
        Object.defineProperty(navigator, 'language', {
            get: () => 'en-SG',
            configurable: true
        });
        Object.defineProperty(navigator, 'languages', {
            get: () => ['en-SG', 'en'],
            configurable: true
        });
    } catch(e) {}

    // --- 伪造 Intl.DateTimeFormat locale ---
    const OrigDTF = Intl.DateTimeFormat;
    Intl.DateTimeFormat = function() {
        const instance = new OrigDTF(...arguments);
        const origResolved = instance.resolvedOptions.bind(instance);
        instance.resolvedOptions = function() {
            const opts = origResolved();
            opts.locale = 'en-SG';
            opts.timeZone = 'Asia/Singapore';
            return opts;
        };
        return instance;
    };
    Intl.DateTimeFormat.prototype = OrigDTF.prototype;

    // --- 伪造 Intl.NumberFormat locale ---
    const OrigNF = Intl.NumberFormat;
    Intl.NumberFormat = function() {
        const instance = new OrigNF(...arguments);
        const origResolved = instance.resolvedOptions.bind(instance);
        instance.resolvedOptions = function() {
            const opts = origResolved();
            opts.locale = 'en-SG';
            return opts;
        };
        return instance;
    };
    Intl.NumberFormat.prototype = OrigNF.prototype;

    // --- 伪造 Intl.Collator locale ---
    const OrigCol = Intl.Collator;
    Intl.Collator = function() {
        const instance = new OrigCol(...arguments);
        const origResolved = instance.resolvedOptions.bind(instance);
        instance.resolvedOptions = function() {
            const opts = origResolved();
            opts.locale = 'en-SG';
            return opts;
        };
        return instance;
    };
    Intl.Collator.prototype = OrigCol.prototype;

    // ============================================================
    // 第二部分：隐藏中文字体 + Canvas 噪声
    // ============================================================

    const CJK_FONT_RE = /("|')?(Songti|Microsoft\s*YaHei(\s*UI)?|微软雅黑|SimSun|宋体|NSimSun|新宋体|SimHei|黑体|FangSong|仿宋|KaiTi|楷体|PingFang\s*(SC|TC|HK)|苹方[-\s]*(简|繁|港)|Hiragino\s*Sans\s*(GB|CNS)|STSong|华文宋体|STKaiti|华文楷体|STHeiti|华文黑体|STFangsong|华文仿宋|WenQuanYi|文泉驿|Noto\s*Sans\s*(SC|TC|JP|KR)|Noto\s*Serif\s*(SC|TC|JP|KR)|Source\s*Han|思源|MiSans|HarmonyOS|Droid\s*Sans\s*Fallback)(\1)?/gi;

    function censorFont(val) {
        val = val.replace(CJK_FONT_RE, '');
        val = val.replace(/,\s*,/g, ',').replace(/^,\s*/, '').replace(/,\s*$/, '');
        return val || '16px Arial, sans-serif';
    }

    // --- 拦截 Canvas.font ---
    try {
        const desc = Object.getOwnPropertyDescriptor(CanvasRenderingContext2D.prototype, 'font');
        if (desc && desc.set) {
            const origSet = desc.set;
            Object.defineProperty(CanvasRenderingContext2D.prototype, 'font', {
                get: desc.get,
                set: function(v) { origSet.call(this, censorFont(String(v))); },
                configurable: true, enumerable: true
            });
        }
    } catch(e) {}

    // --- getImageData 噪声 ---
    const _getImageData = CanvasRenderingContext2D.prototype.getImageData;
    CanvasRenderingContext2D.prototype.getImageData = function() {
        const d = _getImageData.apply(this, arguments);
        try {
            for (let i = 0; i < d.data.length; i += 4) {
                if (Math.random() < 0.0001) d.data[i] ^= 1;
            }
        } catch(e) {}
        return d;
    };

    // --- toDataURL / toBlob / toImageBitmap 噪声 ---
    function addNoise(canvas) {
        try {
            const ctx = canvas.getContext('2d', { willReadFrequently: true });
            if (ctx && canvas.width > 0 && canvas.height > 0) {
                const img = ctx.getImageData(0, 0, canvas.width, canvas.height);
                for (let i = 0; i < img.data.length; i += 4) {
                    if (Math.random() < 0.0001) img.data[i] ^= 1;
                }
                ctx.putImageData(img, 0, 0);
            }
        } catch(e) {}
    }

    const _toDataURL = HTMLCanvasElement.prototype.toDataURL;
    HTMLCanvasElement.prototype.toDataURL = function() { addNoise(this); return _toDataURL.apply(this, arguments); };

    const _toBlob = HTMLCanvasElement.prototype.toBlob;
    HTMLCanvasElement.prototype.toBlob = function() { addNoise(this); return _toBlob.apply(this, arguments); };

    // --- 拦截 CSS 字体检测 ---
    if (typeof FontFaceSet !== 'undefined') {
        const _check = FontFaceSet.prototype.check;
        FontFaceSet.prototype.check = function(font) {
            if (CJK_FONT_RE.test(String(font))) return false;
            return _check.call(this, font);
        };
    }

    // ============================================================
    // 第三部分：屏蔽事件里的时区 / locale 指纹泄漏
    // ============================================================

    // --- 伪造 getTimezoneOffset 为 UTC+8 (新加坡) ---
    const _getTimezoneOffset = Date.prototype.getTimezoneOffset;
    Date.prototype.getTimezoneOffset = function() {
        return -480;
    };

    const _toLocaleString = Date.prototype.toLocaleString;
    Date.prototype.toLocaleString = function() {
        if (arguments.length === 0) return _toLocaleString.call(this, 'en-SG', { timeZone: 'Asia/Singapore' });
        return _toLocaleString.apply(this, arguments);
    };

    const _toLocaleDateString = Date.prototype.toLocaleDateString;
    Date.prototype.toLocaleDateString = function() {
        if (arguments.length === 0) return _toLocaleDateString.call(this, 'en-SG', { timeZone: 'Asia/Singapore' });
        return _toLocaleDateString.apply(this, arguments);
    };

    const _toLocaleTimeString = Date.prototype.toLocaleTimeString;
    Date.prototype.toLocaleTimeString = function() {
        if (arguments.length === 0) return _toLocaleTimeString.call(this, 'en-SG', { timeZone: 'Asia/Singapore' });
        return _toLocaleTimeString.apply(this, arguments);
    };
})();