feat:增加更改图片大小功能

Dockerfile

@@ -3,7 +3,7 @@ WORKDIR /app
 RUN npm config set registry https://registry.npmmirror.com/
 COPY package*.json ./
 RUN npm install --production
-COPY app.js .
+COPY . .
 RUN mkdir -p /app/images
 EXPOSE 3000
 ENV IMAGE_BASE_DIR=/app/images

app.js

@@ -1,38 +1,17 @@
+require('dotenv').config();
+
 const http = require('http');
 const url = require('url');
 const path = require('path');
 const fs = require('fs');
-const sharp = require('sharp');
+const {sendResponse, isSafePath, processImage} = require("./utils");
 
 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');
+        return sendResponse(res, 405, '仅支持GET请求');
     }
 
     try {
@@ -42,13 +21,7 @@ const server = http.createServer(async (req, res) => {
 
         // 过滤根路径请求（避免直接访问服务根目录）
         if (requestPath === '/') {
-            return sendError(res, 200, `
+            return sendResponse(res, 200, '图片处理服务已启动！');
-                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);
@@ -56,42 +29,39 @@ const server = http.createServer(async (req, res) => {
 
         // 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）');
+            return sendResponse(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：${requestedFilePath}`);
+            return sendResponse(res, 404, `图片不存在：${requestedFilePath}`);
         }
 
-        if (!query.q) {
+        // 如果没有压缩参数，直接返回原图
+        if (!query.q && !query.w && !query.width && !query.h && !query.height) {
             const fileStream = fs.createReadStream(fullImagePath);
-            const ext = path.extname(fullImagePath).slice(1); // 如 png/jpg
+            const ext = path.extname(fullImagePath).slice(1);
-            res.writeHead(200, { 'Content-Type': `image/${ext}` });
+            res.writeHead(200, {'Content-Type': `image/${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：${err.message}`);
+                sendResponse(res, 500, `读取文件失败：${err.message}`);
             });
             return;
         }
 
-        const quality = parseInt(query.q);
+        // 处理图片压缩和调整大小
-        if (isNaN(quality)) {
+        const imageBuffer = await processImage(fullImagePath, query);
-            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
+            'Content-Length': imageBuffer.length,
+            'Cache-Control': 'public, max-age=86400' // 缓存1天
         });
         res.end(imageBuffer);
 
     } catch (error) {
         console.error('服务器异常：', error);
-        sendError(res, 500, `服务器内部错误：${error.message}`);
+        sendResponse(res, 500, `服务器内部错误：${error.message}`);
     }
 });
 

package-lock.json

@@ -9,7 +9,7 @@
       "version": "1.0.0",
       "license": "ISC",
       "dependencies": {
-        "express": "^5.2.1",
+        "dotenv": "^17.3.1",
         "sharp": "^0.34.5"
       }
     },
@@ -462,136 +462,6 @@
         "url": "https://opencollective.com/libvips"
       }
     },
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-      "dependencies": {
-        "mime-types": "^3.0.0",
-        "negotiator": "^1.0.0"
-      },
-      "engines": {
-        "node": ">= 0.6"
-      }
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@@ -600,456 +470,17 @@
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-      }
-    },
-    "node_modules/vary": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmmirror.com/vary/-/vary-1.1.2.tgz",
-      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
-      "engines": {
-        "node": ">= 0.8"
-      }
-    },
-    "node_modules/wrappy": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmmirror.com/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ=="
     }
   }
 }

package.json

@@ -10,6 +10,7 @@
   "license": "ISC",
   "description": "",
   "dependencies": {
+    "dotenv": "^17.3.1",
     "sharp": "^0.34.5"
   }
 }

utils.js

@@ -0,0 +1,77 @@
+const path = require('path');
+const sharp = require('sharp');
+
+// 压缩配置
+const compressOptions = {
+    quality: 0.7,
+    maxHeight: 800,
+    maxWidth: 600
+};
+
+/**
+ * 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);
+}
+
+/**
+ * 发送响应
+ * @param {ServerResponse} res 响应对象
+ * @param {number} statusCode 状态码
+ * @param {string} message 信息
+ */
+function sendResponse(res, statusCode, message) {
+    res.writeHead(statusCode, { 'Content-Type': 'text/plain; charset=utf-8' });
+    res.end(message);
+}
+
+/**
+ * 处理图片压缩和调整大小
+ * @param {string} imagePath 图片路径
+ * @param {Object} query 查询参数
+ * @returns {Promise<Buffer>} 处理后的图片Buffer
+ */
+async function processImage(imagePath, query) {
+    let sharpInstance = sharp(imagePath).rotate();
+
+    // 处理宽高参数
+    let targetWidth = parseInt(query.w) || parseInt(query.width);
+    let targetHeight = parseInt(query.h) || parseInt(query.height);
+
+    // 如果没有指定宽高，使用配置的默认最大宽高
+    if (!targetWidth && !targetHeight) {
+        targetWidth = compressOptions.maxWidth;
+        targetHeight = compressOptions.maxHeight;
+    }
+
+    // 如果指定了宽高，进行调整大小处理
+    if (targetWidth || targetHeight) {
+        const resizeOptions = {
+            width: targetWidth,
+            height: targetHeight,
+            fit: sharp.fit.inside, // 保持宽高比，图片会完整显示在指定区域内
+            withoutEnlargement: true // 不放大比原始尺寸小的图片
+        };
+        sharpInstance = sharpInstance.resize(resizeOptions);
+    }
+
+    // 处理质量参数（优先使用查询参数，否则使用配置的默认值）
+    const quality = query.q ? Math.max(1, Math.min(100, parseInt(query.q))) :
+        Math.round(compressOptions.quality * 100);
+    const finalQuality = Math.max(1, Math.min(100, quality));
+
+    // 转换为JPEG格式并压缩
+    return sharpInstance.jpeg({quality: finalQuality, mozjpeg: true}).toBuffer();
+}
+
+module.exports = {
+    isSafePath,
+    sendResponse,
+    processImage
+}