272 lines
11 KiB
Markdown
272 lines
11 KiB
Markdown
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# busboy
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<div align="center">
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[](https://github.com/fastify/busboy/actions)
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[](https://coveralls.io/r/fastify/busboy?branch=master)
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[](https://standardjs.com/)
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[](https://github.com/nodejs/security-wg/blob/HEAD/processes/responsible_disclosure_template.md)
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</div>
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<div align="center">
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[](https://www.npmjs.com/package/@fastify/busboy)
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[](https://www.npmjs.com/package/@fastify/busboy)
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</div>
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Description
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===========
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A Node.js module for parsing incoming HTML form data.
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This is an officially supported fork by [fastify](https://github.com/fastify/) organization of the amazing library [originally created](https://github.com/mscdex/busboy) by Brian White,
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aimed at addressing long-standing issues with it.
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Benchmark (Mean time for 500 Kb payload, 2000 cycles, 1000 cycle warmup):
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| Library | Version | Mean time in nanoseconds (less is better) |
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|-----------------------|---------|-------------------------------------------|
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| busboy | 0.3.1 | `340114` |
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| @fastify/busboy | 1.0.0 | `270984` |
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[Changelog](https://github.com/fastify/busboy/blob/master/CHANGELOG.md) since busboy 0.31.
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Requirements
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============
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* [Node.js](http://nodejs.org/) 10+
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Install
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=======
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npm i @fastify/busboy
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Examples
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========
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* Parsing (multipart) with default options:
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```javascript
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const http = require('node:http');
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const { inspect } = require('node:util');
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const Busboy = require('busboy');
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http.createServer((req, res) => {
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if (req.method === 'POST') {
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const busboy = new Busboy({ headers: req.headers });
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busboy.on('file', (fieldname, file, filename, encoding, mimetype) => {
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console.log(`File [${fieldname}]: filename: ${filename}, encoding: ${encoding}, mimetype: ${mimetype}`);
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file.on('data', data => {
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console.log(`File [${fieldname}] got ${data.length} bytes`);
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});
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file.on('end', () => {
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console.log(`File [${fieldname}] Finished`);
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});
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});
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busboy.on('field', (fieldname, val, fieldnameTruncated, valTruncated, encoding, mimetype) => {
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console.log(`Field [${fieldname}]: value: ${inspect(val)}`);
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});
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busboy.on('finish', () => {
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console.log('Done parsing form!');
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res.writeHead(303, { Connection: 'close', Location: '/' });
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res.end();
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});
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req.pipe(busboy);
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} else if (req.method === 'GET') {
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res.writeHead(200, { Connection: 'close' });
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res.end(`<html><head></head><body>
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<form method="POST" enctype="multipart/form-data">
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<input type="text" name="textfield"><br>
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<input type="file" name="filefield"><br>
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<input type="submit">
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</form>
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</body></html>`);
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}
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}).listen(8000, () => {
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console.log('Listening for requests');
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});
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// Example output, using http://nodejs.org/images/ryan-speaker.jpg as the file:
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//
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// Listening for requests
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// File [filefield]: filename: ryan-speaker.jpg, encoding: binary
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// File [filefield] got 11971 bytes
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// Field [textfield]: value: 'testing! :-)'
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// File [filefield] Finished
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// Done parsing form!
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```
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* Save all incoming files to disk:
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```javascript
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const http = require('node:http');
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const path = require('node:path');
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const os = require('node:os');
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const fs = require('node:fs');
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const Busboy = require('busboy');
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http.createServer(function(req, res) {
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if (req.method === 'POST') {
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const busboy = new Busboy({ headers: req.headers });
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busboy.on('file', function(fieldname, file, filename, encoding, mimetype) {
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var saveTo = path.join(os.tmpdir(), path.basename(fieldname));
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file.pipe(fs.createWriteStream(saveTo));
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});
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busboy.on('finish', function() {
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res.writeHead(200, { 'Connection': 'close' });
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res.end("That's all folks!");
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});
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return req.pipe(busboy);
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}
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res.writeHead(404);
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res.end();
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}).listen(8000, function() {
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console.log('Listening for requests');
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});
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```
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* Parsing (urlencoded) with default options:
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```javascript
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const http = require('node:http');
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const { inspect } = require('node:util');
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const Busboy = require('busboy');
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http.createServer(function(req, res) {
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if (req.method === 'POST') {
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const busboy = new Busboy({ headers: req.headers });
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busboy.on('file', function(fieldname, file, filename, encoding, mimetype) {
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console.log('File [' + fieldname + ']: filename: ' + filename);
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file.on('data', function(data) {
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console.log('File [' + fieldname + '] got ' + data.length + ' bytes');
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});
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file.on('end', function() {
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console.log('File [' + fieldname + '] Finished');
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});
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});
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busboy.on('field', function(fieldname, val, fieldnameTruncated, valTruncated) {
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console.log('Field [' + fieldname + ']: value: ' + inspect(val));
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});
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busboy.on('finish', function() {
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console.log('Done parsing form!');
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res.writeHead(303, { Connection: 'close', Location: '/' });
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res.end();
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});
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req.pipe(busboy);
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} else if (req.method === 'GET') {
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res.writeHead(200, { Connection: 'close' });
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res.end('<html><head></head><body>\
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<form method="POST">\
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<input type="text" name="textfield"><br />\
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<select name="selectfield">\
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<option value="1">1</option>\
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<option value="10">10</option>\
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<option value="100">100</option>\
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<option value="9001">9001</option>\
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</select><br />\
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<input type="checkbox" name="checkfield">Node.js rules!<br />\
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<input type="submit">\
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</form>\
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</body></html>');
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}
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}).listen(8000, function() {
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console.log('Listening for requests');
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});
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// Example output:
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//
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// Listening for requests
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// Field [textfield]: value: 'testing! :-)'
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// Field [selectfield]: value: '9001'
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// Field [checkfield]: value: 'on'
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// Done parsing form!
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```
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API
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===
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_Busboy_ is a _Writable_ stream
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Busboy (special) events
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-----------------------
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* **file**(< _string_ >fieldname, < _ReadableStream_ >stream, < _string_ >filename, < _string_ >transferEncoding, < _string_ >mimeType) - Emitted for each new file form field found. `transferEncoding` contains the 'Content-Transfer-Encoding' value for the file stream. `mimeType` contains the 'Content-Type' value for the file stream.
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* Note: if you listen for this event, you should always handle the `stream` no matter if you care about the file contents or not (e.g. you can simply just do `stream.resume();` if you want to discard the contents), otherwise the 'finish' event will never fire on the Busboy instance. However, if you don't care about **any** incoming files, you can simply not listen for the 'file' event at all and any/all files will be automatically and safely discarded (these discarded files do still count towards `files` and `parts` limits).
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* If a configured file size limit was reached, `stream` will both have a boolean property `truncated` (best checked at the end of the stream) and emit a 'limit' event to notify you when this happens.
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* The property `bytesRead` informs about the number of bytes that have been read so far.
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* **field**(< _string_ >fieldname, < _string_ >value, < _boolean_ >fieldnameTruncated, < _boolean_ >valueTruncated, < _string_ >transferEncoding, < _string_ >mimeType) - Emitted for each new non-file field found.
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* **partsLimit**() - Emitted when specified `parts` limit has been reached. No more 'file' or 'field' events will be emitted.
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* **filesLimit**() - Emitted when specified `files` limit has been reached. No more 'file' events will be emitted.
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* **fieldsLimit**() - Emitted when specified `fields` limit has been reached. No more 'field' events will be emitted.
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Busboy methods
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--------------
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* **(constructor)**(< _object_ >config) - Creates and returns a new Busboy instance.
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* The constructor takes the following valid `config` settings:
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* **headers** - _object_ - These are the HTTP headers of the incoming request, which are used by individual parsers.
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* **autoDestroy** - _boolean_ - Whether this stream should automatically call .destroy() on itself after ending. (Default: false).
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* **highWaterMark** - _integer_ - highWaterMark to use for this Busboy instance (Default: WritableStream default).
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* **fileHwm** - _integer_ - highWaterMark to use for file streams (Default: ReadableStream default).
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* **defCharset** - _string_ - Default character set to use when one isn't defined (Default: 'utf8').
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* **preservePath** - _boolean_ - If paths in the multipart 'filename' field shall be preserved. (Default: false).
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* **isPartAFile** - __function__ - Use this function to override the default file detection functionality. It has following parameters:
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* fieldName - __string__ The name of the field.
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* contentType - __string__ The content-type of the part, e.g. `text/plain`, `image/jpeg`, `application/octet-stream`
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* fileName - __string__ The name of a file supplied by the part.
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(Default: `(fieldName, contentType, fileName) => (contentType === 'application/octet-stream' || fileName !== undefined)`)
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* **limits** - _object_ - Various limits on incoming data. Valid properties are:
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* **fieldNameSize** - _integer_ - Max field name size (in bytes) (Default: 100 bytes).
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* **fieldSize** - _integer_ - Max field value size (in bytes) (Default: 1 MiB, which is 1024 x 1024 bytes).
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* **fields** - _integer_ - Max number of non-file fields (Default: Infinity).
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* **fileSize** - _integer_ - For multipart forms, the max file size (in bytes) (Default: Infinity).
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* **files** - _integer_ - For multipart forms, the max number of file fields (Default: Infinity).
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* **parts** - _integer_ - For multipart forms, the max number of parts (fields + files) (Default: Infinity).
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* **headerPairs** - _integer_ - For multipart forms, the max number of header key=>value pairs to parse **Default:** 2000
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* **headerSize** - _integer_ - For multipart forms, the max size of a multipart header **Default:** 81920.
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* The constructor can throw errors:
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* **Busboy expected an options-Object.** - Busboy expected an Object as first parameters.
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* **Busboy expected an options-Object with headers-attribute.** - The first parameter is lacking of a headers-attribute.
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* **Limit $limit is not a valid number** - Busboy expected the desired limit to be of type number. Busboy throws this Error to prevent a potential security issue by falling silently back to the Busboy-defaults. Potential source for this Error can be the direct use of environment variables without transforming them to the type number.
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* **Unsupported Content-Type.** - The `Content-Type` isn't one Busboy can parse.
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* **Missing Content-Type-header.** - The provided headers don't include `Content-Type` at all.
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