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January 4, 2018 06:11
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Shows how to handle file uploads in node.js line by line.
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const http = require('http'); | |
const readline = require('readline'); | |
const HTML_PAGE = `<!doctype html> | |
<html> | |
<head> | |
<title>File upload testing</title> | |
<meta charset="utf-8"> | |
<script> | |
function handleSubmit(e) { | |
e.preventDefault(); | |
const file = document.querySelector('[type=file]').files[0]; | |
if (!file) { | |
alert('You must select a file!'); | |
} else { | |
const xhr = new XMLHttpRequest(); | |
xhr.open('POST', 'http://localhost:3000', true); | |
xhr.send(file); | |
} | |
} | |
</script> | |
</head> | |
<body> | |
<h1>Try uploading a file</h1> | |
<form onsubmit="handleSubmit(event)"> | |
<input type="file"> | |
<br> | |
<button type="submit">submit</button> | |
</form> | |
</body> | |
</html>`; | |
http.createServer((req, res) => { | |
if (req.method === 'POST') { | |
const rl = readline.createInterface({ | |
input: req | |
}); | |
let lineNumber = 0; | |
rl.on('line', line => { | |
++lineNumber; | |
if (line.indexOf('http://') === -1) { | |
rl.close(); | |
res.statusCode = 500; | |
return res.end(`line ${lineNumber} was invalid`); | |
} | |
console.log(`line ${lineNumber}: ${line}`); | |
}); | |
rl.on('error', err => { | |
console.log('err', err); | |
}); | |
req.on('end', () => { | |
console.log('done'); | |
res.end('All done!'); | |
}); | |
} else if (req.method === 'GET') { | |
res.end(HTML_PAGE); | |
} else { | |
res.statusCode = 500; | |
res.end('Unknown method'); | |
} | |
}).listen(3000); |
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