request-multipart

Multipart body support for request-compose

var request = require('request-compose').extend({
  Request: {multipart: require('request-multipart')}
}).client

;(async () => {
  try {
    var {res, body} = await request({
      method: 'POST',
      url: 'https://slack.com/api/files.upload',
      headers: {
        authorization: 'Bearer [ACCESS TOKEN]'
      },
      multipart: {
        file: require('fs').createReadStream('cat.png')
      }
    })
    console.log(body)
  }
  catch (err) {
    console.error(err)
  }
})()

multipart/form-data

multipart: {
  key: 'value' // String, Buffer or Stream
}

multipart: {
  status: 'Hello',
  'media[]': fs.createReadStream('cat.png')
}

--88b7fcd3-7776-4087-8b09-5b0f5c8af069
Content-Disposition: form-data; name="status"
Content-Type: text/plain

Hello

--88b7fcd3-7776-4087-8b09-5b0f5c8af069
Content-Disposition: form-data; name="media[]"; filename="cat.png"
Content-Type: image/png

...stream...

Options

Most servers expect the filename key to be set inside the Content-Disposition and a correct MIME type to be specified as Content-Type. When reading a file as Buffer request-multipart cannot determine those values.

multipart: {
  key: {
    body: 'value', // String, Buffer or Stream
    options: {name: '', type: '', length: 0}
  }
}

multipart: {
  file: {
    body: fs.readFileSync('cat.png'),
    options: {name: 'cat.png', type: 'image/png'}
  }
}

--77f9de0f-8905-4b63-9ca9-ad1ff9827053
Content-Disposition: form-data; name="file"; filename="cat.png"
Content-Type: image/png

...buffer...

List

multipart: {
  key: [
    'value', // String, Buffer or Stream
    'value', // String, Buffer or Stream
  ]
}

multipart: {
  attachment: [
    fs.createReadStream('cat.png'),
    fs.createReadStream('beep.mp3')
  ]
}

--21cd47c7-379b-43f3-8e5e-d95c36653abf
Content-Disposition: form-data; name="attachment"; filename="cat.png"
Content-Type: image/png

...stream...

--21cd47c7-379b-43f3-8e5e-d95c36653abf
Content-Disposition: form-data; name="attachment"; filename="beep.mp3"
Content-Type: audio/mpeg

...stream...

multipart/related

multipart: [
  {
    key: 'value',
    body: 'value' // String, Buffer or Stream
  },
  {
    key: 'value',
    body: 'value' // String, Buffer or Stream
  }
]

multipart: [
  {
    'Content-Type': 'application/json',
    body: JSON.stringify({name: 'cat.png'})
  },
  {
    'Content-Type': 'image/png',
    body: fs.createReadStream('cat.png')
  }
]

--f3386c29-f73f-423f-b80e-9dac2801893b
Content-Type: application/json

{"name":"cat.png"}

--f3386c29-f73f-423f-b80e-9dac2801893b
Content-Type: image/png

...stream...

examples

DEBUG=req,res,body,json node examples/multipart.js slack