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Solution #242

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183 changes: 178 additions & 5 deletions src/createServer.js
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Original file line number Diff line number Diff line change
@@ -1,10 +1,183 @@
'use strict';

const http = require('http');
const zlib = require('zlib');
const { Readable } = require('stream');

const COMPRESSION_TYPES = {
gzip: { create: () => zlib.createGzip(), extension: 'gz' },
deflate: { create: () => zlib.createDeflate(), extension: 'dfl' },
br: { create: () => zlib.createBrotliCompress(), extension: 'br' },
};

const FORM_HTML = `<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>File Compressor</title></head>
<body>
<h1>File Compressor</h1>
<form method="POST" action="/compress" enctype="multipart/form-data">
<label>File: <input type="file" name="file" required></label><br>
<label>Compression type:
<select name="compressionType">
<option value="gzip">gzip</option>
<option value="deflate">deflate</option>
<option value="br">br</option>
</select>
</label><br>
<button type="submit">Compress</button>
</form>
</body>
</html>`;

function sendError(res, status, message) {
res.statusCode = status;
res.setHeader('Content-Type', 'text/plain');
res.end(message);
}

function getBoundary(contentType) {
const match = contentType.match(/boundary=(.+)$/);

return match ? match[1] : null;
}

function parseMultipart(buffer, boundary) {
const fields = {};
const sep = Buffer.from('--' + boundary);
const parts = [];

let start = 0;

while (start < buffer.length) {
const sepIdx = buffer.indexOf(sep, start);

if (sepIdx === -1) {
break;
}

const afterSep = sepIdx + sep.length;

if (buffer[afterSep] === 45 && buffer[afterSep + 1] === 45) {
break;
}

const headerStart = afterSep + 2;
const headerEnd = buffer.indexOf(Buffer.from('\r\n\r\n'), headerStart);

if (headerEnd === -1) {
break;
}

const headerStr = buffer.slice(headerStart, headerEnd).toString();
const bodyStart = headerEnd + 4;
const nextSep = buffer.indexOf(sep, bodyStart);
const bodyEnd = nextSep - 2;
const body = buffer.slice(bodyStart, bodyEnd);

parts.push({ headers: headerStr, body });
start = nextSep;
}

for (const part of parts) {
const nameMatch = part.headers.match(/name="([^"]+)"/);
const filenameMatch = part.headers.match(/filename="([^"]+)"/);

if (!nameMatch) {
continue;
}

const name = nameMatch[1];

if (filenameMatch) {
fields[name] = { filename: filenameMatch[1], data: part.body };
} else {
fields[name] = part.body.toString();
}
}

return fields;
}

function handleCompress(req, res) {
const contentType = req.headers['content-type'] || '';
const boundary = getBoundary(contentType);

if (!boundary) {
return sendError(res, 400, 'Bad Request: multipart/form-data required.');
}

const chunks = [];

req.on('data', (chunk) => chunks.push(chunk));

req.on('end', () => {
const buffer = Buffer.concat(chunks);
const fields = parseMultipart(buffer, boundary);

const file = fields['file'];
const compressionType = fields['compressionType'];

if (!file || !file.filename) {
return sendError(res, 400, 'Bad Request: file is required.');
}

if (!compressionType) {
return sendError(res, 400, 'Bad Request: compressionType is required.');
}

const compression = COMPRESSION_TYPES[compressionType];

if (!compression) {
return sendError(
res,
400,
`Bad Request: unsupported compression type "${compressionType}".`,
);
}

const outputFilename = `${file.filename}.${compression.extension}`;

res.statusCode = 200;

res.setHeader(
'Content-Disposition',
`attachment; filename=${outputFilename}`,
);
res.setHeader('Content-Type', 'application/octet-stream');

const readable = new Readable();

readable.push(file.data);
readable.push(null);

readable.pipe(compression.create()).pipe(res);
});

req.on('error', () => sendError(res, 400, 'Bad Request: stream error.'));
}

function createServer() {
/* Write your code here */
// Return instance of http.Server class
return http.createServer((req, res) => {
const { method, url } = req;

if (method === 'GET' && url === '/') {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/html');
res.end(FORM_HTML);

return;
}

if (url === '/compress') {
if (method !== 'POST') {
return sendError(res, 400, 'Bad Request: use POST method.');
}

return handleCompress(req, res);
}

sendError(res, 404, 'Not Found');
});
}

module.exports = {
createServer,
};
module.exports = { createServer };
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