A javascript/nodejs multipart/form-data parser which operates on raw data.
npm install parse-multipartA javascript/nodejs multipart/form-data parser which operates on raw data.
Cristian Salazar. Email: christiansalazarh@gmail.com, Website: www.chileshift.cl,
i live in Santiago de Chile. I am Amazon AWS developper focused in Serverless
software development, i call it: the new age of software development.
Please follow me on Twitter @AmazonAwsVideos and keep informed about more Amazon Aws Videos. Watch my video on which i expose the necesary steps to implement a Multiform/form-data parser inside a Amazon Aws ApiGateway. You can subscribe to my channel.
Sometimes you only have access to the raw multipart payload and it needs to be
parsed in order to extract the files or data contained on it. As an example:
the Amazon AWS ApiGateway, which will operate as a facade between the http
client and your component (the one written by you designed to extract the
uploaded files or data).
The raw payload formatted as multipart/form-data will looks like this one:
``
------WebKitFormBoundaryDtbT5UpPj83kllfw
Content-Disposition: form-data; name="uploads[]"; filename="somebinary.dat"
Content-Type: application/octet-stream
some binary data...maybe the bits of a image..
------WebKitFormBoundaryDtbT5UpPj83kllfw
Content-Disposition: form-data; name="uploads[]"; filename="sometext.txt"
Content-Type: text/plain
hello how are you
------WebKitFormBoundaryDtbT5UpPj83kllfw--
`
The lines above represents a raw multipart/form-data payload sent by some
HTTP client via form submission containing two files. We need to extract the
all files contained inside it. The multipart format allows you to send more
than one file in the same payload, that's why it is called: multipart.
In the next lines you can see a implementation. In this case two key values
needs to be present:
* body, which can be:
`
------WebKitFormBoundaryDtbT5UpPj83kllfw
Content-Disposition: form-data; name="uploads[]"; filename="sometext.txt"
Content-Type: application/octet-stream
hello how are you
------WebKitFormBoundaryDtbT5UpPj83kllfw--
`
* boundary, the string which serve as a 'separator' between parts, it normally
comes to you via headers. In this case, the boundary is:
`
----WebKitFormBoundaryDtbT5UpPj83kllfw
Now, having this two key values then you can implement it:
`
var multipart = require('parse-multipart');
var body = "..the multipart raw body..";
var boundary = "----WebKitFormBoundaryDtbT5UpPj83kllfw";
var parts = multipart.Parse(body,boundary);
for(var i=0;i
// will be:
// { filename: 'A.txt', type: 'text/plain',
// data:
}
The returned data is an array of parts, each one described by a filename,
a type and a data, this last one is a Buffer (see also Node Buffer).