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
2026-01-20 03:08:15 +08:00
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+node_modules/
+.env
+cache/
--- a/README.md
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+# 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。
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+++ b/package-lock.json
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+        "ms": "^2.1.3",
+        "on-finished": "^2.4.1",
+        "range-parser": "^1.2.1",
+        "statuses": "^2.0.1"
+      },
+      "engines": {
+        "node": ">= 18"
+      }
+    },
+    "node_modules/serve-static": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-2.2.0.tgz",
+      "integrity": "sha512-61g9pCh0Vnh7IutZjtLGGpTA355+OPn2TyDv/6ivP2h/AdAVX9azsoxmg2/M6nZeQZNYBEwIcsne1mJd9oQItQ==",
+      "license": "MIT",
+      "dependencies": {
+        "encodeurl": "^2.0.0",
+        "escape-html": "^1.0.3",
+        "parseurl": "^1.3.3",
+        "send": "^1.2.0"
+      },
+      "engines": {
+        "node": ">= 18"
+      }
+    },
+    "node_modules/setprototypeof": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
+      "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==",
+      "license": "ISC"
+    },
+    "node_modules/side-channel": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.1.0.tgz",
+      "integrity": "sha512-ZX99e6tRweoUXqR+VBrslhda51Nh5MTQwou5tnUDgbtyM0dBgmhEDtWGP/xbKn6hqfPRHujUNwz5fy/wbbhnpw==",
+      "license": "MIT",
+      "dependencies": {
+        "es-errors": "^1.3.0",
+        "object-inspect": "^1.13.3",
+        "side-channel-list": "^1.0.0",
+        "side-channel-map": "^1.0.1",
+        "side-channel-weakmap": "^1.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/side-channel-list": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/side-channel-list/-/side-channel-list-1.0.0.tgz",
+      "integrity": "sha512-FCLHtRD/gnpCiCHEiJLOwdmFP+wzCmDEkc9y7NsYxeF4u7Btsn1ZuwgwJGxImImHicJArLP4R0yX4c2KCrMrTA==",
+      "license": "MIT",
+      "dependencies": {
+        "es-errors": "^1.3.0",
+        "object-inspect": "^1.13.3"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/side-channel-map": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/side-channel-map/-/side-channel-map-1.0.1.tgz",
+      "integrity": "sha512-VCjCNfgMsby3tTdo02nbjtM/ewra6jPHmpThenkTYh8pG9ucZ/1P8So4u4FGBek/BjpOVsDCMoLA/iuBKIFXRA==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.2",
+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.5",
+        "object-inspect": "^1.13.3"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/side-channel-weakmap": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/side-channel-weakmap/-/side-channel-weakmap-1.0.2.tgz",
+      "integrity": "sha512-WPS/HvHQTYnHisLo9McqBHOJk2FkHO/tlpvldyrnem4aeQp4hai3gythswg6p01oSoTl58rcpiFAjF2br2Ak2A==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.2",
+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.5",
+        "object-inspect": "^1.13.3",
+        "side-channel-map": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/statuses": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",
+      "integrity": "sha512-DvEy55V3DB7uknRo+4iOGT5fP1slR8wQohVdknigZPMpMstaKJQWhwiYBACJE3Ul2pTnATihhBYnRhZQHGBiRw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
+    "node_modules/type-is": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.0.1.tgz",
+      "integrity": "sha512-OZs6gsjF4vMp32qrCbiVSkrFmXtG/AZhY3t0iAMrMBiAZyV9oALtXO8hsrHbMXF9x6L3grlFuwW2oAz7cav+Gw==",
+      "license": "MIT",
+      "dependencies": {
+        "content-type": "^1.0.5",
+        "media-typer": "^1.1.0",
+        "mime-types": "^3.0.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "license": "ISC"
+    }
+  }
+}
--- a/package.json
+++ b/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "wordpress-mshots",
+  "version": "1.0.0",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "axios": "^1.12.2",
+    "dotenv": "^17.2.3",
+    "express": "^5.1.0"
+  }
+}
--- a/server.js
+++ 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<boolean>}
+ */
+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<string>}
+ */
+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://${target}`;
+}
+
+/**
+ * 请求上游并处理重试
+ * @param {string} upstreamUrl 
+ * @param {number} tries 
+ * @returns {Promise<any>}
+ */
+async function fetchUpstreamWithRetry(upstreamUrl, tries = 2) {
+  let lastErr = null;
+  for (let i = 0; i < tries; i++) {
+    try {
+      return await axios.get(upstreamUrl, {
+        responseType: 'arraybuffer',
+        headers: {
+          'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120 Safari/537.36',
+          'Accept': 'image/avif,image/webp,image/apng,image/*;q=0.8,*/*;q=0.5',
+          'Host': 's0.wp.com',
+        },
+        maxRedirects: 5,
+        timeout: 20000,
+        // 禁用代理环境变量的干扰
+        proxy: false,
+        // 明确允许非 2xx 也返回给上层判断
+        validateStatus: () => true,
+      });
+    } catch (err) {
+      lastErr = err;
+      console.error(`[upstream-error] try=${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}`);
+});