commit 781bc3bd86191b83d1fbaaa3da45e60be7205bd8 Author: Snowz <372492339@qq.com> Date: Tue Jan 20 03:08:15 2026 +0800 feat: 新增WordPress mShots代理服务实现 实现基于Node.js的WordPress mShots反向代理服务,主要功能包括: - 代理请求到上游服务并缓存响应 - 自动检测目标主机SSL支持 - 提供缓存兜底机制 - 支持省略协议自动补全 diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..18cd82b --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +node_modules/ +.env +cache/ \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..9b0dd6e --- /dev/null +++ b/README.md @@ -0,0 +1,55 @@ +# WordPress mShots Proxy + +这是一个基于 Node.js 的 WordPress mShots 服务反向代理,主要用于缓存截图请求,减少回源次数,并支持自动协议检测。 + +## 功能特性 + +- **反向代理**: 代理请求到 `https://s0.wp.com/mshots/v1`。 +- **持久化缓存**: 将有效的图片响应缓存到本地文件系统 (`cache/` 目录)。 +- **兜底机制**: 当上游服务不可用时,尝试返回本地已有的缓存。 +- **自动协议检测**: 支持省略 URL 协议(http/https),系统会自动检测目标主机是否支持 HTTPS (端口 443),若支持则优先使用 HTTPS,否则降级为 HTTP。 + +## 安装与运行 + +1. 安装依赖: + ```bash + npm install + ``` + +2. 启动服务: + ```bash + npm start + ``` + 默认运行在端口 `11489`。 + +## 使用方法 + +### 基础用法 + +直接将目标 URL 附加到代理服务地址后面: + +- `http://localhost:11489/https://www.baidu.com` +- `http://localhost:11489/http://example.com` + +### 自动协议检测 (新功能) + +你可以省略 `http://` 或 `https://`,服务会自动判断: + +- `http://localhost:11489/www.baidu.com` + - 系统会尝试连接 `www.baidu.com:443`。 + - 如果连接成功,将代理到 `https://s0.wp.com/mshots/v1/https://www.baidu.com`。 + - 否则,将代理到 `https://s0.wp.com/mshots/v1/http://www.baidu.com`。 + +## 环境变量 + +- `PORT`: 指定服务监听端口 (默认 11489)。 + +## 更新日志 + +- **2026-01-20**: + - 重构代码,提取核心代理逻辑。 + - 新增 `checkPort443` 函数,实现目标主机的 SSL/HTTPS 自动检测。 + - 更新路由处理,支持无协议前缀的 URL 请求(如 `/www.baidu.com`)。 + - 添加详细的代码注释。 + - 优化协议检测逻辑:当目标主机 443 端口无法连接或超时时,自动降级并打印日志 `falling back to HTTP`,确保非 SSL 站点也能正常访问。 + - 优化缓存逻辑:不再缓存小尺寸(< 15KB)的 GIF 图片(通常是 mShots 的 "Generating" 占位图),以便下次请求时能重新尝试获取真实截图。 diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..196891f --- /dev/null +++ b/package-lock.json @@ -0,0 +1,987 @@ +{ + "name": "wordpress-mshots", + 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"^1.12.2", + "dotenv": "^17.2.3", + "express": "^5.1.0" + } +} diff --git a/server.js b/server.js new file mode 100644 index 0000000..da45a19 --- /dev/null +++ b/server.js @@ -0,0 +1,292 @@ +const express = require('express'); +const axios = require('axios'); +const fs = require('fs'); +const path = require('path'); +const crypto = require('crypto'); +const net = require('net'); + +require('dotenv').config(); +const app = express(); +const PORT = Number(process.env.PORT) || 11489; +const UPSTREAM_HOST = 'https://s0.wp.com'; +const CACHE_DIR = path.join(process.cwd(), 'cache'); + +fs.mkdirSync(CACHE_DIR, { recursive: true }); + +/** + * 计算 SHA1 哈希 + * @param {string} input + * @returns {string} + */ +function sha1(input) { + return crypto.createHash('sha1').update(input).digest('hex'); +} + +/** + * 获取缓存文件路径 + * @param {string} key + * @returns {{data: string, meta: string}} + */ +function getCachePaths(key) { + return { + data: path.join(CACHE_DIR, `${key}.data`), + meta: path.join(CACHE_DIR, `${key}.json`), + }; +} + +/** + * 验证响应是否为有效的图片 + * @param {number} status + * @param {object} headers + * @param {any} data + * @returns {boolean} + */ +function isValidImageResponse(status, headers, data) { + const ct = (headers['content-type'] || '').toLowerCase(); + const lenHeader = headers['content-length']; + const len = Array.isArray(data) ? data.length : (data?.byteLength || 0); + const hasPositiveLength = (lenHeader ? parseInt(lenHeader, 10) > 0 : len > 0); + + // 过滤掉 GIF 图片 (通常是 mShots 的 "Generating" 占位图,约 9KB) + // 我们不缓存这些图片,以便下次请求时能再次尝试获取真实截图 + if (ct.includes('image/gif') && len < 15000) { + return false; + } + + return status === 200 && ct.startsWith('image/') && hasPositiveLength; +} + +/** + * 检查主机是否开放 443 端口 (简单的 SSL 判断) + * @param {string} host + * @returns {Promise} + */ +function checkPort443(host) { + return new Promise(resolve => { + // 默认超时 1.5 秒,避免阻塞太久 + const socket = net.connect(443, host); + socket.setTimeout(1500); + socket.on('connect', () => { + socket.end(); + resolve(true); + }); + socket.on('error', () => { + resolve(false); + }); + socket.on('timeout', () => { + socket.destroy(); + resolve(false); + }); + }); +} + +/** + * 解析目标 URL,支持自动补全协议 + * @param {string} rawPath + * @returns {Promise} + */ +async function resolveTargetUrl(rawPath) { + // 去除开头的 / + let target = rawPath.startsWith('/') ? rawPath.slice(1) : rawPath; + + // 如果已经包含协议,直接返回 + if (target.startsWith('http://') || target.startsWith('https://')) { + return target; + } + + // 提取主机名 + let host = target.split('/')[0].split('?')[0]; + // 去除端口号(如果存在) + const colonIndex = host.indexOf(':'); + if (colonIndex !== -1) { + host = host.substring(0, colonIndex); + } + + // 尝试检测 SSL + const isHttps = await checkPort443(host); + if (!isHttps) { + console.log(`[protocol-detect] ${host} : 443 port closed or timeout, falling back to HTTP.`); + } + return isHttps ? `https://${target}` : `http://${target}`; +} + +/** + * 请求上游并处理重试 + * @param {string} upstreamUrl + * @param {number} tries + * @returns {Promise} + */ +async function fetchUpstreamWithRetry(upstreamUrl, tries = 2) { + let lastErr = null; + for (let i = 0; i < tries; i++) { + try { + return await axios.get(upstreamUrl, { + responseType: 'arraybuffer', + headers: { + 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120 Safari/537.36', + 'Accept': 'image/avif,image/webp,image/apng,image/*;q=0.8,*/*;q=0.5', + 'Host': 's0.wp.com', + }, + maxRedirects: 5, + timeout: 20000, + // 禁用代理环境变量的干扰 + proxy: false, + // 明确允许非 2xx 也返回给上层判断 + validateStatus: () => true, + }); + } catch (err) { + lastErr = err; + console.error(`[upstream-error] try=${i + 1} url=${upstreamUrl} msg=${err.message}`); + // 简单退避 + await new Promise(r => setTimeout(r, 300)); + } + } + if (lastErr) throw lastErr; +} + +/** + * 核心处理逻辑:检查缓存 -> 回源 -> 写入缓存 -> 返回响应 + * @param {object} res + * @param {string} upstreamUrl + */ +async function handleProxyRequest(res, upstreamUrl) { + const key = sha1(upstreamUrl); + const { data: dataPath, meta: metaPath } = getCachePaths(key); + + try { + // 1. 尝试读取缓存 + if (fs.existsSync(dataPath) && fs.existsSync(metaPath)) { + try { + const metaRaw = fs.readFileSync(metaPath, 'utf8'); + const meta = JSON.parse(metaRaw); + if (meta.contentType && meta.contentType.toLowerCase().startsWith('image/')) { + res.set('Cache-Control', 'public, max-age=315360000, immutable'); + res.type(meta.contentType); + const stream = fs.createReadStream(dataPath); + stream.on('error', () => { + if (!res.headersSent) res.status(500).send('Cache read error'); + }); + return stream.pipe(res); + } + } catch (e) { + // 缓存元数据损坏,忽略,继续回源 + } + } + + // 2. 回源请求 + const resp = await fetchUpstreamWithRetry(upstreamUrl); + + // 3. 仅缓存有效图片 + if (isValidImageResponse(resp.status, resp.headers, resp.data)) { + const contentType = resp.headers['content-type'] || 'image/jpeg'; + const meta = { + url: upstreamUrl, + contentType, + size: resp.data.byteLength, + createdAt: new Date().toISOString(), + }; + try { + fs.writeFileSync(dataPath, resp.data); + fs.writeFileSync(metaPath, JSON.stringify(meta)); + } catch (e) { + // 写盘失败也继续返回 + } + res.type(contentType); + res.set('Cache-Control', 'public, max-age=315360000, immutable'); + return res.send(resp.data); + } + + // 4. 非图片或非200:兜底策略 + // 若本地已有有效缓存(可能是旧的但有效),优先返回缓存 + if (fs.existsSync(dataPath) && fs.existsSync(metaPath)) { + try { + const metaRaw = fs.readFileSync(metaPath, 'utf8'); + const meta = JSON.parse(metaRaw); + if (meta.contentType && meta.contentType.toLowerCase().startsWith('image/')) { + res.set('Cache-Control', 'public, max-age=315360000, immutable'); + res.type(meta.contentType); + const stream = fs.createReadStream(dataPath); + stream.on('error', () => { + if (!res.headersSent) res.status(500).send('Cache read error'); + }); + return stream.pipe(res); + } + } catch (_) {} + } + + // 否则透传上游响应 + res.status(resp.status); + if (resp.headers['content-type']) res.type(resp.headers['content-type']); + return res.send(resp.data); + + } catch (err) { + // 5. 回源彻底失败 + // 若本地有缓存可兜底 + if (fs.existsSync(dataPath) && fs.existsSync(metaPath)) { + try { + const metaRaw = fs.readFileSync(metaPath, 'utf8'); + const meta = JSON.parse(metaRaw); + if (meta.contentType && meta.contentType.toLowerCase().startsWith('image/')) { + res.set('Cache-Control', 'public, max-age=315360000, immutable'); + res.type(meta.contentType); + const stream = fs.createReadStream(dataPath); + stream.on('error', () => { + if (!res.headersSent) res.status(500).send('Cache read error'); + }); + return stream.pipe(res); + } + } catch (_) {} + } + console.error(`[upstream-failed] url=${upstreamUrl} err=${err.message}`); + return res.status(502).type('text/plain').send('Upstream error'); + } +} + +// 反代 mShots,路径 /mshots/v1/... +app.use('/mshots/v1', async (req, res) => { + if (req.method !== 'GET') { + return res.status(405).type('text/plain').send('Method Not Allowed'); + } + + // 这里的 req.originalUrl 包含 /mshots/v1 前缀 + // 我们假设用户可能访问 /mshots/v1/www.baidu.com + // 需要提取出后面的部分进行解析 + const prefix = '/mshots/v1'; + let pathPart = req.originalUrl; + if (pathPart.startsWith(prefix)) { + pathPart = pathPart.slice(prefix.length); + } + + // 解析目标 URL(补全协议) + const targetUrl = await resolveTargetUrl(pathPart); + + // 拼接完整上游 URL + const upstreamUrl = UPSTREAM_HOST + '/mshots/v1/' + targetUrl; + + return handleProxyRequest(res, upstreamUrl); +}); + +// 根路径处理:/https://example.com 或 /www.baidu.com +app.use(async (req, res) => { + if (req.method !== 'GET') { + return res.status(405).type('text/plain').send('Method Not Allowed'); + } + if (req.path === '/') { + return res.type('text/plain').send('mShots proxy is running. Try /https://www.baidu.com or /www.baidu.com'); + } + + // 解析目标 URL(补全协议) + const targetUrl = await resolveTargetUrl(req.originalUrl); + + // 拼接完整上游 URL + const upstreamUrl = UPSTREAM_HOST + '/mshots/v1/' + targetUrl; + + return handleProxyRequest(res, upstreamUrl); +}); + +// 简单根路由健康检查 +// 根路径健康由上面的 app.use 处理 + +app.listen(PORT, () => { + console.log(`Proxy running at http://localhost:${PORT}`); +}); \ No newline at end of file