全国团体标准PDF下载助手

嗅探全国团体标准信息平台的PDF链接，添加下载按钮
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// ==UserScript==
// @name         全国团体标准PDF下载助手
// @namespace    http://tampermonkey.net/
// @version      2.1
// @description  嗅探全国团体标准信息平台的PDF链接，添加下载按钮
// @author       Dflying & Claude
// @match        https://www.ttbz.org.cn/Pdfs/Index/*
// @grant        none
// @run-at       document-idle
// @license      MIT
// ==/UserScript==

(function() {
    'use strict';

    // 创建样式
    const style = document.createElement('style');
    style.textContent = `
        .pdf-download-container {
            position: fixed; /* 固定位置，不随滚动变化 */
            z-index: 10000;
            display: flex;
            flex-direction: column;
            gap: 10px;
            right: 50px;
            top: 50px;
        }
        .pdf-download-btn {
            background-color: #4CAF50;
            color: white;
            padding: 10px 14px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 14px;
            font-weight: bold;
            box-shadow: 0 2px 5px rgba(0,0,0,0.3);
            transition: all 0.2s;
            white-space: nowrap;
        }
        .pdf-download-btn:hover {
            background-color: #45a049;
            transform: translateY(-1px);
            box-shadow: 0 3px 7px rgba(0,0,0,0.3);
        }
        .download-status {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background-color: rgba(0,0,0,0.8);
            color: white;
            padding: 12px 16px;
            border-radius: 4px;
            z-index: 10001;
            display: none;
            font-weight: bold;
        }
    `;
    document.head.appendChild(style);

    // 创建UI元素
    const btnContainer = document.createElement('div');
    btnContainer.className = 'pdf-download-container';
    document.body.appendChild(btnContainer);

    const statusEl = document.createElement('div');
    statusEl.className = 'download-status';
    document.body.appendChild(statusEl);

    // 显示状态消息
    function showStatus(message, isError = false) {
        statusEl.textContent = message;
        statusEl.style.backgroundColor = isError ? 'rgba(220,53,69,0.9)' : 'rgba(0,0,0,0.8)';
        statusEl.style.display = 'block';
        setTimeout(() => statusEl.style.display = 'none', 3000);
    }

    // 初始化函数
    function init() {
        console.log("**PDF下载助手已启动**");
        findPdfLinks();
    }

    // 查找PDF下载链接
    function findPdfLinks() {
        let pdfUrl = null;

        // 方法1: 从iframe src提取
        const myIframe = document.getElementById('myiframe');
        if (myIframe) {
            const src = myIframe.src || myIframe.getAttribute('src');
            if (src) {
                const match = src.match(/file=(\/Home\/PdfFileStreamGet\/[^&]+)/);
                if (match && match[1]) {
                    pdfUrl = `https://www.ttbz.org.cn${match[1]}`;
                    console.log(`**从iframe src提取到PDF链接**:`, pdfUrl);
                }
            }
        }

        // 方法2: 从URL参数构造
        if (!pdfUrl) {
            const currentUrl = window.location.href;
            const urlMatch = currentUrl.match(/\/Pdfs\/Index\/\?ftype=([^&]+)&pms=(\d+)/);

            if (urlMatch && urlMatch[1] && urlMatch[2]) {
                const ftype = urlMatch[1];
                const pms = urlMatch[2];
                const encodedParam = btoa(`${ftype},${pms}`);
                pdfUrl = `https://www.ttbz.org.cn/Home/PdfFileStreamGet/${encodedParam}`;
                console.log(`**从URL参数构造的PDF链接**:`, pdfUrl);
            }
        }

        // 添加下载按钮
        const button = document.createElement('button');
        button.className = 'pdf-download-btn';
        button.textContent = '下载PDF文件';
        button.addEventListener('click', () => {
            if (pdfUrl) {
                downloadPDF(pdfUrl);
            } else {
                showStatus("无法找到PDF链接", true);
            }
        });
        btnContainer.appendChild(button);
    }

    // 下载PDF并处理文件名
    function downloadPDF(url) {
        showStatus("正在下载PDF文件...");

        fetch(url)
            .then(response => {
                const responseClone = response.clone();

                // 尝试获取文件名
                let filename = "";
                const contentDisposition = response.headers.get('Content-Disposition');
                if (contentDisposition) {
                    const filenameMatch = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/.exec(contentDisposition);
                    if (filenameMatch && filenameMatch[1]) {
                        filename = filenameMatch[1].replace(/['"]/g, '');
                    }
                }

                // 从URL中提取文件名
                if (!filename) {
                    const urlParts = url.split('/');
                    filename = urlParts[urlParts.length - 1].split('_rnd=')[0];
                    if (!filename.toLowerCase().endsWith('.pdf')) {
                        filename += '.pdf';
                    }
                }

                return responseClone.blob().then(blob => ({ blob, filename }));
            })
            .then(({ blob, filename }) => {
                console.log(`**下载文件名**: ${filename}`);

                // 创建下载链接
                const downloadUrl = URL.createObjectURL(blob);
                const a = document.createElement('a');
                a.href = downloadUrl;
                a.download = filename;
                document.body.appendChild(a);
                a.click();
                document.body.removeChild(a);
                URL.revokeObjectURL(downloadUrl);

                showStatus("PDF文件下载成功！");
            })
            .catch(error => {
                console.error("**下载失败**:", error);
                showStatus("下载失败，请查看控制台获取详细信息", true);
            });
    }

    // 启动脚本
    init();
})();
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