剪贴板保护控制

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剪贴板保护控制

默认禁止网页自动写入剪贴板，可通过脚本菜单允许写入剪贴板
换行
// ==UserScript==
// @name         剪贴板保护控制
// @version      1.1
// @description  默认禁止网页自动写入剪贴板，可通过脚本菜单允许写入剪贴板
// @author       Gemini
// @match        *://*/*
// @run-at       document-start
// @grant        GM_registerMenuCommand
// @grant        GM_unregisterMenuCommand
// @grant        GM_setValue
// @grant        GM_getValue
// @namespace    http://greasyfork.icu/users/452911
// ==/UserScript==

(function() {
    'use strict';

    if (window.__GUARD_REINFORCED__) return;
    window.__GUARD_REINFORCED__ = true;

    // 生成当前域名唯一的存储 Key
    const STORAGE_KEY = `cb_protect_${location.hostname}`;
    let isUserSelection = false;

    // 核心判定逻辑
    function canWrite() {
        // 读取当前域名的独立设置，如果没有设置过，默认返回 true (开启保护)
        const protectionEnabled = GM_getValue(STORAGE_KEY, true);
        
        if (!protectionEnabled) return true; // 已手动信任该域名
        return isUserSelection; // 保护中：仅允许用户选中的写入
    }

    // --- 拦截逻辑 ---

    if (navigator.clipboard) {
        const originalWriteText = navigator.clipboard.writeText.bind(navigator.clipboard);
        Object.defineProperty(navigator.clipboard, 'writeText', {
            value: function(text) {
                if (canWrite()) return originalWriteText(text);
                console.warn(`🛡️ [${location.hostname}] 自动写入被拦截`);
                return Promise.resolve();
            }, configurable: true
        });

        if (navigator.clipboard.write) {
            const originalWrite = navigator.clipboard.write.bind(navigator.clipboard);
            Object.defineProperty(navigator.clipboard, 'write', {
                value: async function(data) {
                    if (canWrite()) return originalWrite(data);
                    console.warn(`🛡️ [${location.hostname}] 自动写入被拦截`);
                    return Promise.resolve();
                }, configurable: true
            });
        }
    }

    const originalExec = document.execCommand.bind(document);
    document.execCommand = function(cmd) {
        if (cmd === 'copy') {
            const text = window.getSelection().toString();
            if (canWrite()) return originalExec.apply(document, arguments);
            return true;
        }
        return originalExec.apply(document, arguments);
    };

    document.addEventListener('copy', (e) => {
        const text = window.getSelection().toString();
        if (!canWrite()) {
            e.stopImmediatePropagation();
            e.preventDefault();
        }
    }, true);

    // --- 意图识别 ---

    document.addEventListener('selectionchange', () => {
        isUserSelection = window.getSelection().toString().trim().length > 0;
    }, true);

    document.addEventListener('mousedown', () => {
        setTimeout(() => {
            if (!window.getSelection().toString().trim()) isUserSelection = false;
        }, 0);
    }, true);

    // --- 分域名菜单控制 ---

    let menuId;
    function updateMenu() {
        if (menuId) GM_unregisterMenuCommand(menuId);
        
        const isProtected = GM_getValue(STORAGE_KEY, true);
        const statusIcon = isProtected ? "🛡️" : "⚠️";
        const actionText = isProtected ? "保护中 (点击在此网站禁用)" : "已信任 (点击开启保护)";
        
        menuId = GM_registerMenuCommand(`${statusIcon} ${location.hostname}: ${actionText}`, () => {
            GM_setValue(STORAGE_KEY, !isProtected);
            updateMenu();
            // 💡 提示：因为逻辑是动态判断 STORAGE_KEY 的，所以切换后立即生效，无需刷新页面
        });
    }

    updateMenu();
})();