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Direct Upload to Amazon S3 With CORS
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s3_direct_upload.gemspec

README.md

S3DirectUpload

Easily generate a form that allows you to upload directly to Amazon S3. Multi file uploading supported by jquery-fileupload.

Code extracted from Ryan Bates' gallery-jquery-fileupload.

Installation

Add this line to your application's Gemfile:

gem 's3_direct_upload'

Then add a new initalizer with your AWS credentials:

config/initalizers/s3_direct_upload.rb

S3DirectUpload.config do |c|
  c.access_key_id = ""       # your access key id
  c.secret_access_key = ""   # your secret access key
  c.bucket = ""              # your bucket name
end

Make sure your AWS S3 CORS settings for your bucket look something like this:

<CORSConfiguration>
    <CORSRule>
        <AllowedOrigin>http://0.0.0.0:3000</AllowedOrigin>
        <AllowedMethod>GET</AllowedMethod>
        <AllowedMethod>POST</AllowedMethod>
        <AllowedMethod>PUT</AllowedMethod>
        <MaxAgeSeconds>3000</MaxAgeSeconds>
        <AllowedHeader>*</AllowedHeader>
    </CORSRule>
</CORSConfiguration>

In production the AllowedOrigin key should be your domain.

Add the following js and css to your asset pipeline:

application.js.coffee

#= require s3_direct_upload

application.css

//= require s3_direct_upload_progress_bars

Usage

Create a new view that uses the form helper s3_uploader_form:

<%= s3_uploader_form post: model_url, as: "model[image_url]", id: "myS3Uploader" do %>
  <%= file_field_tag :file, multiple: true %>
<% end %>

Then in your application.js.coffee, call the S3Uploader jQuery plugin on the element you created above:

jQuery ->
  $("#myS3Uploader").S3Uploader()

Also place this template in the same view for the progress bars:

<script id="template-upload" type="text/x-tmpl">
<div class="upload">
  {%=o.name%}
  <div class="progress"><div class="bar" style="width: 0%"></div></div>
</div>
</script>

Options for form helper

post: -> url in which is POST'd to after file is uploaded to S3. Example: model_url

as: -> parameter value for the POST in which the key will be the URL of the file on S3. If for example this is set to "model[image_url]" then the data posted would be model[image_url] : http://bucketname.s3.amazonws.com/filename.ext

key: -> key on s3. defaults to "uploads/#{SecureRandom.hex}/${filename}". needs to be at least "${filename}".

acl: -> acl for files uploaded to s3, defaults to "public-read"

max_file_size: -> maximum file size, defaults to 500.megabytes

id: -> html id for the form, its recommended that you give the form an id so you can reference with the jQuery plugin.

class: -> optional html class for the form.

Persisting the S3 url

It is recommended that you persist the image_url that is sent back from the POST request (to the url given to the post option and as the key given in the as option). So to access your files later.

One way to do this is to make sure you have resources model in your routes file, and add the image_url (or whatever you would like to name it) attribute to your model, and then make sure you have the create action in your controller for that model.

You could then have your create action render a javascript file like this: create.js.erb

<% if @model.new_record? %>
  alert("Failed to upload model: <%= j @model.errors.full_messages.join(', ').html_safe %>");
<% else %>
  $("#container").append("<%= j render(@model) %>");
<% end %>

So that javascript code would be executed after the model instance is created, without a page refresh. See @rbates's gallery-jquery-fileupload) for an example of that method.

Note: the POST request to the rails app also includes the following parameters filesize, filetype, filename and filepath.

Advanced Customizations

Feel free to override the styling for the progress bars in s3_direct_upload_progress_bars.css, look at the source for inspiration.

Also feel free to write your own js to interface with jquery-file-upload. You might want to do this to do custom validations on the files before it is sent to S3 for example. To do this remove s3_direct_upload from your application.js and include the necessary jquery-file-upload scripts in your asset pipeline (they are included in this gem automatically):

#= require jquery-fileupload/basic
#= require jquery-fileupload/vendor/tmpl

Use the javascript in s3_direct_upload as a guide.

Options for S3Upload jQuery Plugin

path -> manual path for the files on your s3 bucket. Example: path/to/my/files/on/s3

Note: the file path in your s3 bucket will effectively be path + key.

additional_data -> You can send additional data to your rails app in the persistence POST request. Example: {key: value}

This would be accessable in your params hash as params[:key][:value]

before_add -> Callback function that executes before a file is added to the que. It is passed file object and expects true or false to be returned.

This could be useful if you would like to validate the filenames of files to be uploaded for example. If true is returned file will be uploaded as normal, false will cancel the upload.

Public methods

You can change the settings on your form later on by accessing the jQuery instance:

jQuery ->
  v = $("#myS3Uploader").S3Uploader()
  ...
  v.path("new/path/") 
  v.additional_data("newdata")

### Global Event Hooks

When all uploads finish in a batch an `s3_uploads_complete` event will be triggered on `document`, so you could do something like:
```javascript
$(document).bind('s3_uploads_complete', function(){
    ...
    alert("All Uploads completed")
}); 

Example with all options.

jQuery ->
  $("#myS3Uploader").S3Uploader
    path: 'path/to/my/files/on/s3'
    additional_data: {key: 'value'}
    before_add: myCallBackFunction() # must return true or false if set

Contributing / TODO

This is just a simple gem that only really provides some javascript and a form helper. This gem could go all sorts of ways based on what people want and how people contribute. Ideas:

  • More specs!
  • More options to control file types, ability to batch upload.
  • More convention over configuration on rails side
  • Create generators.
  • Model methods.
  • Model method to delete files from s3

Credit

This gem is basically a small wrapper around code that Ryan Bates wrote for Railscast#383. Most of the code in this gem was extracted from gallery-jquery-fileupload.

Thank you Ryan Bates!

This code also uses the excellecnt jQuery-File-Upload, which is included in this gem by its rails counterpart jquery-fileupload-rails

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