attache-upload

attache-upload.js

Upload files to your attache server.

Example

import {upload, presign} from 'attache-upload'

presign(presign_url)
  .then((presignResponse) => {

    // presignResponse:
    //
    // {
    //   url: "http://path_to_your_attache_server/upload",
    //   uuid: "5f0d4d62-e082-4cdf-a143-26258de59c47",
    //   expiration: 1461649282,
    //   hmac: "fd89637821afca1787dfe458be29bc87f0366122"
    // }

    return upload(presignResponse, fileObject)
  })
  .then((uploadResponse) => {

    // uploadResponse:
    //
    // {
    //   path: "54/4d/15/14/b4/09/29/01/36/42/2f/e2/3f/f0/42/15/some_file.jpg",
    //   content_type: "image/jpeg",
    //   geometry: "300x300",
    //   bytes: 19804
    // }

  })
  .catch((err) => {
    // Handle error
  })

Install

$ npm install --save attache-upload

API Documentation

presign(options)

• presign_url - required, a URL to perform a presign request.
• token - optional, X-CSRF-Token value.

On success, this request will return:

• url - the URL to the /upload API of your attache serve
• uuid - a uuid string
• expiration - a unix timestamp of a future time
• hmac - the HMAC-SHA1 of your SECRET_KEY

presign(presign_url, token)
  .then((presignResponse) => {
    // {
    //   url: "http://path_to_your_attache_server/upload",
    //   uuid: "5f0d4d62-e082-4cdf-a143-26258de59c47",
    //   expiration: 1461649282,
    //   hmac: "fd89637821afca1787dfe458be29bc87f0366122"
    // }
  })

upload(options)

• presignResponse - required, response object passed in from presign request.
• fileObject - required.
  An object containing a uid and file property.
  We use this uid as a reference to this object's XHR request, which can then be aborted at a later stage using abortXHRRequest('uid')

{
    uid: 'some_generated_uid', // String
    file: FILE // File object
}

• onProgress - optional, onProgress function.

On success, this request will return:

• path - a unique path for the uploaded file
• content_type
• geometry
• bytes

function customProgressHandler (progressEvent, file) {
  console.log('Uploading ' + file.name + ' @ ' + progressEvent.percent + '%')
  //=> 'Uploading foo.jpg @ 100%'
}

presign(presign_url)
  .then((presignResponse) => {
    return upload(presignResponse, fileObject, customProgressHandler)
  })
  .then((uploadResponse) => {
    // {
    //   path: "54/4d/15/14/b4/09/29/01/36/42/2f/e2/3f/f0/42/15/some_file.jpg",
    //   content_type: "image/jpeg",
    //   geometry: "300x300",
    //   bytes: 19804
    // }
  })

getXHRRequests()

To access all existing XHR requests use getXHRRequests().

import {getXHRRequests} from 'attache-upload'

getXHRRequests()
// {
//   'some_uid': request(){},
//   'some_other_request':  request(){}
// }

abortXHRRequest(String)

To abort an existing XHR requests use destroyXHRRequest() passing in the id of the request.

import {getXHRRequests, abortXHRRequest} from 'attache-upload'

getXHRRequests()
// {
//   'some_uid': request(){},
//   'some_other_request':  request(){}
// }

abortXHRRequest('some_uid')

getXHRRequests()
// {
//   'some_other_request':  request(){}
// }

Error handling

Both presign the upload methods will return a custom error objects if either promise is rejected.
The XHR requests for each method will return a custom responseStatus error message if the response status is not between 200 and 300.
This allows us to check for specific errors in our upload process.

The custom error objects look like this:

{
  error: {original error object},
  message: 'Not Authorised'
  name: 'uploadRequest'
}

The 3 custom error names we cater for are:

• presignRequest - Rejected presign
• uploadRequest - Rejected upload
• responseStatus - A failing XHR response status

All other errors should be left to bubble up and logged to the console.

Example

import {upload, presign} from 'attache-upload'

presign(presign_url)
  .then((presignResponse) => {
    return upload(presignResponse, fileObject)
  })
  .then((uploadResponse) => {
    return doSomethingWithResponse(uploadResponse)
  })
  .catch((err) => {
    // check is the error was with our upload process
    const {name} = err
    if (name === 'presignRequest' || name === 'uploadRequest' || name === 'responseStatus') {
      doSomethingWithErrorMessage(err)
    } else {
      // log and throw the error
      console.error(err)
      throw err
    }
  })

Generate a uid for your file object

Some files may have the same name, so it would be great if we had a unique way of identifying them and their XHR request. Creating a uid for your file object is as simple as:

import uid from 'uid'

/**
 * generateUniqueID
 * @param {String} name
 * @return {String}
 */

function generateUniqueID (name) {
  return uid(10) + '_' + name
}

const myUID = generateUniqueID(file.name)
//> hbswt489ts_image.jpg

Development

Build

Compile src scripts to lib:

$ npm run build

Tests

To run the test suite, first install the dependencies, then run npm test:

$ npm install
$ npm test