Create canvas.js
Browse files
canvas.js
ADDED
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| 1 |
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const express = require('express');
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const multer = require('multer');
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const JSZip = require('jszip');
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const { createCanvas } = require('canvas');
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const crypto = require('crypto');
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const app = express();
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// 设置 multer 用于处理文件上传
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const storage = multer.memoryStorage();
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const upload = multer({ storage: storage });
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app.use(express.json());
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app.use(express.urlencoded({ extended: true }));
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// 新增 GET / 路由来提供前端页面
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app.get('/', (req, res) => {
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res.send(`
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>File Upload</title>
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</head>
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<body>
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<h1>Upload a File</h1>
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<form id="uploadForm" action="/upload" method="post" enctype="multipart/form-data">
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<input type="file" id="fileInput" name="file" required>
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<button type="submit">Upload</button>
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</form>
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<script>
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document.getElementById('uploadForm').addEventListener('submit', async (event) => {
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event.preventDefault();
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const formData = new FormData(event.target);
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const response = await fetch(event.target.action, {
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method: 'POST',
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body: formData
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});
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if (response.ok) {
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response.blob().then(blob => {
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const url = window.URL.createObjectURL(blob);
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const a = document.createElement('a');
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a.style.display = 'none';
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a.href = url;
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// 从Content-Disposition头中提取文件名
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const contentDisposition = response.headers.get('Content-Disposition');
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const fileName = contentDisposition.match(/filename="(.+)"/)[1];
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a.download = fileName;
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document.body.appendChild(a);
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a.click();
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window.URL.revokeObjectURL(url);
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alert('File downloaded successfully!');
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});
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} else {
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alert('Failed to upload file.');
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}
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});
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</script>
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</body>
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</html>
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`);
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});
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app.post('/upload', upload.single('file'), async (req, res) => {
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try {
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const file = req.file;
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const fileName = file.originalname;
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const fileType = file.mimetype;
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const fileBuffer = file.buffer;
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// 压缩文件成 zip 格式
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const zip = new JSZip();
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zip.file(fileName, fileBuffer);
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const zipBuffer = await zip.generateAsync({ type: 'nodebuffer' });
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// 创建包含文件信息的表格图片
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const width = 400;
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const height = 300;
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const canvas = createCanvas(width, height);
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const ctx = canvas.getContext('2d');
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ctx.fillStyle = '#FFFFFF';
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ctx.fillRect(0, 0, width, height);
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ctx.fillStyle = '#000000';
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ctx.font = '20px Microsoft YaHei';
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const text = `
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File Name: ${fileName}
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File Type: ${fileType}
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File Size: ${fileBuffer.length} bytes
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Created At: ${new Date().toLocaleString()}
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`;
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ctx.fillText(text.trim(), 10, 100);
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const rawImageData = canvas.toBuffer('image/jpeg', { quality: 0.75 });
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const finalBuffer = Buffer.concat([rawImageData, zipBuffer]);
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//const outputFileName = encodeURIComponent(fileName.replace(/\.[^/.]+$/, "") + '-pic.zip.jpg');
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// 生成随机的哈希值作为文件名
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const hash = crypto.randomBytes(16).toString('hex');
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const outputFileName = encodeURIComponent(hash + '-pic.zip.jpg');
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res.setHeader('Content-Type', 'image/jpeg');
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res.setHeader('Content-Disposition', `attachment; filename="${outputFileName}"`);
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res.send(finalBuffer);
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} catch (error) {
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console.error(error);
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res.status(500).send('An error occurred');
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}
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});
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const PORT = process.env.PORT || 7860;
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app.listen(PORT, () => {
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console.log(`Server running on port ${PORT}`);
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});
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