react-s3-uploader

Provides a React component that automatically uploads to an S3 Bucket.

Install

$ npm install react-s3-uploader

From Browser

var ReactS3Uploader = require('react-s3-uploader');

...

<ReactS3Uploader
    signingUrl="/s3/sign"
    accept="image/*"
    onProgress={this.onUploadProgress}
    onError={this.onUploadError}
    onFinish={this.onUploadFinish}
    signingUrlHeaders={{ additional: headers }}
    signingUrlQueryParams={{ additional: query-params }}
    uploadRequestHeaders={{ 'x-amz-acl': 'public-read' }}
    contentDisposition="auto" />

The above example shows all supported props. For uploadRequestHeaders, the default ACL is shown.

This expects a request to /s3/sign to return JSON with a signedUrl property that can be used to PUT the file in S3.

contentDisposition is optional and can be one of inline, attachment or auto. If given, the Content-Disposition header will be set accordingly with the file's original filename. If it is auto, the disposition type will be set to inline for images and attachment for all other files.

The resulting DOM is essentially:

<input type="file" onChange={this.uploadFile} />

When a file is chosen, it will immediately be uploaded to S3. You can listen for progress (and create a status bar, for example) by providing an onProgress function to the component.

Server-Side

Bundled router

You can use the Express router that is bundled with this module to answer calls to /s3/sign

app.use('/s3', require('react-s3-uploader/s3router')({
    bucket: "MyS3Bucket",
    region: 'us-east-1', //optional
    ACL: 'private' // this is default
}));

This also provides another endpoint: GET /s3/img/(.*) and GET /s3/uploads/(.*). This will create a temporary URL that provides access to the uploaded file (which are uploaded privately at the moment). The request is then redirected to the URL, so that the image is served to the client.

Access/Secret Keys

The aws-sdk must be configured with your account's Access Key and Secret Access Key. There are a number of ways to provide these, but setting up environment variables is the quickest. You just have to configure environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY, and AWS automatically picks them up.

Other Types of Servers

Boto for Python, in a Django project

import boto
import mimetypes
import json

...
conn = boto.connect_s3('AWS_KEY', 'AWS_SECRET')

def sign_s3_upload(request):
    object_name = request.GET['objectName']
    content_type = mimetypes.guess_type(object_name)[0]

    signed_url = conn.generate_url(
        300,
        "PUT",
        'BUCKET_NAME',
        'FOLDER_NAME' + object_name,
        headers = {'Content-Type': content_type, 'x-amz-acl':'public-read'})

    return HttpResponse(json.dumps({'signedUrl': signed_url}))

Ruby on Rails, assuming FOG usage

# Usual fog config, set as an initializer
FOG = Fog::Storage.new({
  :provider              => 'AWS',
  :aws_access_key_id     => ENV['AWS_ACCESS_KEY_ID'],
  :aws_secret_access_key => ENV['AWS_SECRET_ACCESS_KEY']
})

# In the controller
options = {path_style: true}
headers = {"Content-Type" => params[:contentType], "x-amz-acl" => "public-read"}

@url = FOG.put_object_url(ENV['S3_BUCKET_NAME'], "user_uploads/#{params[:objectName]}", 15.minutes.from_now.to_time.to_i, headers, options)

respond_to do |format|
  format.json { render json: {signedUrl: @url} }
end

Other Servers

If you do some work on another server, and would love to contribute documentation, please send us a PR!