Spaces:
Runtime error
Runtime error
File size: 11,592 Bytes
311cc15 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 |
# 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.
|