S3 accepts uploads via specially-crafted and pre-authorized HTML POST Form (https://aws.amazon.com/articles/1434/). This gem will help you create two values: Signature and Policy.

You guys can use this gem when working with upload file by AngularJS - (https://github.com/danialfarid/ng-file-upload#s3) or Cordova File Transfer plugin (https://github.com/apache/cordova-plugin-file-transfer) or any front-end stack.

Add this line to your application's Gemfile:

gem 's3-authorize'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install s3-authorize

require 's3/authorize'

s3_authorize = S3::Authorize.new(bucket: 'example', acl: 'public-read', 'secret_key': '356789032')

s3_policy = s3_authorize.policy # eyJleHBpcmF0aW9uIjoiMjAxNi0wNC0yNlQxOTozNjowNFoiLCJjb25 ....

s3-signature = s3_authorize.signature(s3_policy) # VR9hEPY0zvMHOt ....

Bug reports and pull requests are welcome on GitHub at https://github.com/vinhnglx/s3-authorize. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.