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