feat:图片服务

.gitignore

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+# 依赖
+/node_modules
+/.pnp
+.pnp.js
+
+# 测试报告
+/coverage
+
+# 编译后的输出
+/dist
+
+# 环境变量文件
+.env
+.env.development
+.env.production
+
+# 日志文件
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# 操作系统生成的文件
+.DS_Store
+Thumbs.db
+
+# 编辑器配置文件
+.idea
+.vscode
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
+
+/uploads

Dockerfile

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+FROM node:18-alpine
+WORKDIR /app
+RUN npm config set registry https://registry.npmmirror.com/
+COPY package*.json ./
+RUN npm install --production
+COPY app.js .
+RUN mkdir -p /app/images
+EXPOSE 3000
+ENV IMAGE_BASE_DIR=/app/images
+ENV PORT=3000
+CMD ["node", "app.js"]

app.js

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+const http = require('http');
+const url = require('url');
+const path = require('path');
+const fs = require('fs');
+const sharp = require('sharp');
+
+const PORT = process.env.PORT || 3000;
+const IMAGE_BASE_DIR = process.env.IMAGE_BASE_DIR || '/app/images';
+
+/**
+ * 安全检查：防止路径遍历攻击（如 ../../etc/passwd）
+ * @param {string} targetPath 目标文件路径
+ * @param {string} baseDir 基础目录
+ * @returns {boolean} 是否合法
+ */
+function isSafePath(targetPath, baseDir) {
+    const resolvedTarget = path.resolve(targetPath).toLowerCase();
+    const resolvedBase = path.resolve(baseDir).toLowerCase();
+    return resolvedTarget.startsWith(resolvedBase);
+}
+
+/**
+ * 发送错误响应
+ * @param {http.ServerResponse} res 响应对象
+ * @param {number} statusCode 状态码
+ * @param {string} message 错误信息
+ */
+function sendError(res, statusCode, message) {
+    res.writeHead(statusCode, { 'Content-Type': 'text/plain; charset=utf-8' });
+    res.end(message);
+}
+
+const server = http.createServer(async (req, res) => {
+    if (req.method !== 'GET') {
+        return sendError(res, 405, '仅支持GET请求');
+    }
+
+    try {
+        const parsedUrl = url.parse(req.url, true);
+        const requestPath = parsedUrl.pathname;
+        const query = parsedUrl.query;
+
+        // 过滤根路径请求（避免直接访问服务根目录）
+        if (requestPath === '/') {
+            return sendError(res, 200, `
+                图片处理服务已启动！
+                使用示例：
+                1. 访问原图片：http://localhost:${PORT}/a/b/c.png
+                2. 调整质量：http://localhost:${PORT}/a/b/c.png?q=80
+                图片基础目录：${IMAGE_BASE_DIR}
+            `);
+        }
+
+        const requestedFilePath = requestPath.slice(1);
+        const fullImagePath = path.join(IMAGE_BASE_DIR, requestedFilePath);
+
+        // 安全检查：防止路径遍历
+        if (!isSafePath(fullImagePath, IMAGE_BASE_DIR)) {
+            return sendError(res, 403, '访问拒绝：非法路径（路径遍历攻击）');
+        }
+
+        if (!fs.existsSync(fullImagePath)) {
+            return sendError(res, 404, `图片不存在：${requestedFilePath}`);
+        }
+
+        if (!query.q) {
+            const fileStream = fs.createReadStream(fullImagePath);
+            const ext = path.extname(fullImagePath).slice(1); // 如 png/jpg
+            res.writeHead(200, { 'Content-Type': `image/${ext}` });
+            // 流式传输文件（适合大文件）
+            fileStream.pipe(res);
+            fileStream.on('error', (err) => {
+                sendError(res, 500, `读取文件失败：${err.message}`);
+            });
+            return;
+        }
+
+        const quality = parseInt(query.q);
+        if (isNaN(quality)) {
+            return sendError(res, 400, '质量参数q必须是数字（1-100）');
+        }
+        const finalQuality = Math.max(1, Math.min(100, quality));
+
+        const imageBuffer = await sharp(fullImagePath).rotate().jpeg({ quality: finalQuality }).toBuffer();
+
+        res.writeHead(200, {
+            'Content-Type': 'image/jpeg',
+            'Content-Length': imageBuffer.length
+        });
+        res.end(imageBuffer);
+
+    } catch (error) {
+        console.error('服务器异常：', error);
+        sendError(res, 500, `服务器内部错误：${error.message}`);
+    }
+});
+
+// ===================== 启动服务器 =====================
+server.listen(PORT, '0.0.0.0', () => {
+    console.log(`服务地址：http://0.0.0.0:${PORT}`);
+});
+
+// 捕获全局未处理异常
+process.on('uncaughtException', (err) => {
+    console.error('全局未捕获异常：', err);
+});
+process.on('unhandledRejection', (reason) => {
+    console.error('全局未处理Promise拒绝：', reason);
+});

docker-compose.yml

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+services:
+  image-service:
+    image: cxx/image-service:0.0.1
+    container_name: image-service
+    ports:
+      - "3000:3000"
+    volumes:
+      - /path/to/images:/app/images
+    environment:
+      - IMAGE_BASE_DIR=/app/images
+      - PORT=3000
+    restart: unless-stopped

package.json

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+{
+  "name": "image-service",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "sharp": "^0.34.5"
+  }
+}