Add nodejs-file-upload sample

Author: lionello

samples/nodejs-file-upload/Dockerfile

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+# Use an official Node runtime based on slim as a parent image
+FROM node:20-slim
+
+# Set the working directory to /app
+WORKDIR /app
+
+# Install curl and any other dependencies
+RUN apt-get update \
+    \
+    && apt-get install -y --no-install-recommends \
+        curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy package.json and package-lock.json into the container at /app
+COPY package*.json ./
+
+# Install any needed packages specified in package.json
+RUN npm install
+
+# Copy the current directory contents into the container
+COPY . .
+
+# Make port 3000 available to the world outside this container
+EXPOSE 3000
+
+# Run the app when the container launches
+ENTRYPOINT [ "node", "main.js" ]

samples/nodejs-file-upload/compose.yaml

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+services:
+  service1:
+    restart: always
+    build:
+      context: .
+      dockerfile: Dockerfile
+    ports:
+      - mode: ingress
+        target: 3000
+        published: 3000
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:3000/"]

samples/nodejs-file-upload/main.js

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+const express = require('express');
+const multer = require('multer');
+const fs = require('fs');
+const path = require('path');
+
+const app = express();
+const upload = multer({ dest: 'uploads/' });
+
+app.use(express.static('uploads'));
+
+app.get('/', (req, res) => {
+    fs.readdir('uploads', (err, files) => {
+        if (err) {
+            return res.status(500).send('Unable to scan files!');
+        }
+        let fileList = files.map(file => `<li><a href="/${file}">${file}</a></li>`).join('');
+        res.send(`
+            <h1>File Upload</h1>
+            <form ref='uploadForm' 
+                id='uploadForm' 
+                action='/' 
+                method='post' 
+                encType="multipart/form-data">
+                <input type="file" name="file" />
+                <input type='submit' value='Upload!' />
+            </form>
+            <h2>Uploaded Files</h2>
+            <ul>${fileList}</ul>
+        `);
+    });
+});
+
+app.post('/', upload.single('file'), (req, res) => {
+    res.redirect('/');
+});
+
+app.listen(3000, () => {
+    console.log('Server started on port 3000');
+});

samples/nodejs-file-upload/package.json

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+{
+	"name": "service1",
+	"version": "1.0.0",
+	"description": "",
+	"main": "main.js",
+	"scripts": {
+	  "start": "exec node main.js"
+	},
+	"dependencies": {
+	  "express": "^4.17.1",
+	  "multer": "^1.4.4"
+	}
+}