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app.js
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require('dotenv').config();
const express = require('express');
const AWS = require('aws-sdk');
const app = express();
AWS.config.update({
accessKeyId: process.env.AWS_ACCESS_KEY_ID,
secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
region: process.env.AWS_REGION
});
const s3 = new AWS.S3();
app.get('/', async (req, res) => {
res.send(`
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Upload to Bucket</title>
<style>
body {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
background-color: #f4f4f4;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
height: 100vh;
margin: 0;
}
#upload-container {
background-color: white;
padding: 20px;
border-radius: 5px;
box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
width: 300px;
text-align: center;
}
input[type="file"] {
margin-bottom: 10px;
width: 100%;
}
button {
background-color: #007bff;
color: white;
border: none;
padding: 10px 20px;
border-radius: 5px;
cursor: pointer;
width: 100%;
}
button:hover {
background-color: #0056b3;
}
#progressBarContainer {
width: 100%;
background-color: #ddd;
display: none;
border-radius: 5px;
margin-top: 10px;
}
#progressBar {
width: 0%;
height: 20px;
background-color: #4CAF50;
text-align: center;
line-height: 20px;
color: white;
transition: width 0.4s ease-in-out;
}
#errorMessage {
color: red;
display: none;
margin-top: 10px;
}
select {
margin-bottom: 10px;
width: 100%;
padding: 5px;
border-radius: 5px;
border: 1px solid #ccc;
}
</style>
</head>
<body>
<div id="upload-container">
<h2>Upload File</h2>
<select id="categorySelect" onclick="loadCategories()">
<option value="">Select a category</option>
</select>
<input id="fileUpload" type="file">
<button onclick="uploadFile()">Upload</button>
<div id="progressBarContainer">
<div id="progressBar"></div>
</div>
<div id="errorMessage"></div>
</div>
<script>
let categories = [];
async function loadCategories() {
if (categories.length > 0) return;
try {
const response = await fetch('/fetch-categories');
const data = await response.json();
categories = data.categories;
const categorySelect = document.getElementById('categorySelect');
categories.forEach(category => {
const option = document.createElement('option');
option.value = category;
option.textContent = category;
categorySelect.appendChild(option);
});
} catch (error) {
console.error('Error loading categories:', error);
}
}
async function uploadFile() {
const file = document.getElementById('fileUpload').files[0];
const category = document.getElementById('categorySelect').value;
if (!file) {
alert('Please select a file to upload.');
return;
}
if (!category) {
alert('Please select a category.');
return;
}
document.getElementById('progressBarContainer').style.display = 'block';
document.getElementById('progressBar').style.width = '0%';
document.getElementById('progressBar').textContent = '0%';
document.getElementById('errorMessage').style.display = 'none';
try {
const response = await fetch(\`/generate-presigned-url?filename=\${encodeURIComponent(file.name)}&filetype=\${encodeURIComponent(file.type)}&category=\${encodeURIComponent(category)}\`);
const data = await response.json();
if (!response.ok) {
throw new Error(data.error || 'Failed to get the pre-signed URL.');
}
const xhr = new XMLHttpRequest();
xhr.open('PUT', data.url, true);
xhr.upload.onprogress = function(e) {
if (e.lengthComputable) {
const percentage = (e.loaded / e.total) * 100;
document.getElementById('progressBar').style.width = percentage.toFixed(2) + '%';
document.getElementById('progressBar').textContent = percentage.toFixed(2) + '%';
}
};
xhr.upload.onloadstart = function(e) {
document.getElementById('progressBarContainer').style.display = 'block';
document.getElementById('progressBar').style.width = '0%';
document.getElementById('progressBar').textContent = '0%';
};
xhr.upload.onloadend = function(e) {
document.getElementById('progressBar').style.width = '100%';
document.getElementById('progressBar').textContent = 'Upload complete';
};
xhr.onreadystatechange = function() {
if (xhr.readyState === XMLHttpRequest.DONE) {
if (xhr.status === 200) {
alert('File uploaded successfully.');
} else {
throw new Error('Upload failed with status: ' + xhr.status);
}
}
};
xhr.onerror = function() {
throw new Error('Upload error.');
};
xhr.setRequestHeader('Content-Type', file.type);
xhr.send(file);
} catch (error) {
document.getElementById('errorMessage').textContent = error.message;
document.getElementById('errorMessage').style.display = 'block';
document.getElementById('progressBarContainer').style.display = 'none';
}
}
</script>
</body>
</html>
`);
});
app.get('/fetch-categories', async (req, res) => {
try {
const params = {
Bucket: process.env.S3_BUCKET_NAME,
Delimiter: '/'
};
const data = await s3.listObjectsV2(params).promise();
console.log(data)
const categories = data.CommonPrefixes.map(prefix => prefix.Prefix.split('/').slice(-2, -1)[0])
.filter(category => category !== 'raw_uploads');
res.status(200).json({ categories });
} catch (err) {
res.status(500).json({ error: 'Error fetching categories.' });
}
});
app.get('/generate-presigned-url', async (req, res) => {
const { filename, filetype, category } = req.query;
const params = {
Bucket: process.env.S3_BUCKET_NAME,
Key: `${category}/${filename}`,
Expires: 300,
ContentType: filetype
};
try {
const preSignedUrl = s3.getSignedUrl('putObject', params);
res.status(200).json({ url: preSignedUrl });
} catch (err) {
res.status(500).json({ error: "Unable to create URL" });
}
});
const port = 5500;
app.listen(port, () => {
console.log(`Server running on http://localhost:${port}`);
});