// ==UserScript==
// @name         非同源链接新标签页打开
// @namespace    https://viayoo.com/lissl0
// @version      1.5
// @description  外部链接新标签页打开，并防止在当前页跳转
// @author       DeepSeek + Grok
// @match        *://*/*
// @run-at       document-end
// @license      MIT
// ==/UserScript==

(function () {
    'use strict';

    const processedLinks = new WeakSet();

    const isSameOrigin = (url) => {
        return url.protocol === location.protocol &&
               url.hostname === location.hostname &&
               url.port === location.port;
    };

    const openSafely = (href) => {
        const win = window.open(href, '_blank');
        if (win) win.opener = null;
    };

    const handleClick = (e) => {
        const link = e.currentTarget;
        const href = link.href;

        try {
            const url = new URL(href, location.href);
            if (url.protocol !== 'http:' && url.protocol !== 'https:') return;
            if (isSameOrigin(url)) return;
        } catch {
            return;
        }

        // 完全阻止在当前页打开
        e.preventDefault();
        e.stopImmediatePropagation(); // 阻止其他事件处理器
        
        openSafely(href);
        return false; // 额外保护
    };

    const processLink = (link) => {
        if (processedLinks.has(link)) return;

        try {
            const url = new URL(link.href, location.href);
            if (url.protocol !== 'http:' && url.protocol !== 'https:') return;
            if (isSameOrigin(url)) return;

            // 添加安全属性
            link.target = '_blank';
            link.rel = link.rel ? `${link.rel} noopener noreferrer` : 'noopener noreferrer';

            // 捕获阶段监听，尽早处理
            link.addEventListener('click', handleClick, true);
            
            // 移除可能存在的危险属性
            link.removeAttribute('onclick');
            link.removeAttribute('onmousedown');
            
            processedLinks.add(link);
        } catch {
            // 无效 href，忽略
        }
    };

    const processAll = () => {
        document.querySelectorAll('a[href]').forEach(processLink);
    };

    const observer = new MutationObserver((mutations) => {
        // 优化：只检查新增的节点
        mutations.forEach((mutation) => {
            mutation.addedNodes.forEach((node) => {
                if (node.nodeType === 1) { // Element节点
                    if (node.tagName === 'A' && node.hasAttribute('href')) {
                        processLink(node);
                    }
                    node.querySelectorAll?.('a[href]').forEach(processLink);
                }
            });
        });
    });

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', () => {
            processAll();
            observer.observe(document.body, { childList: true, subtree: true });
        });
    } else {
        processAll();
        observer.observe(document.body, { childList: true, subtree: true });
    }
})();