---

Carrierwave::Blitline

This gem is still under construction but it basically works in its current form.

Installation

Install it with these other Carrierwave gems:

gem "carrierwave"

gem "carrierwave-aws"

gem "carrierwave-blitline"

Then execute

 $ bundle install

Add this to your Carrierwave Uploader files:

class ImageUploader < CarrierWave::Uploader::Base

  # NOTE: We're using MiniMagick here...
  include CarrierWave::MiniMagick

  require "carrierwave/blitline"
  include CarrierWave::Blitline


  # This macro lets your uploader know you're using Carrierwave
  process_via_blitline


  # other stuff ...

end

CONFIGURE

Your Carrierwave setup should be something like this

CarrierWave.configure do |config|

  if Rails.env.test?
    config.storage           = :file
    config.enable_processing = false
    config.asset_host        = 'http://test.host'

  else
    config.aws_credentials = {
      :access_key_id     => ENV["AWS_ACCESS_KEY"],
      :secret_access_key => ENV["AWS_SECRET_ACCESS_KEY"],
      :region            => ENV["S3_BUCKET_REGION"]
    }
    config.storage            :aws
    config.aws_bucket                       = ENV["S3_BUCKET_NAME"]
    config.aws_acl                          = 'public-read'
    config.aws_attributes                   = {
      expires: 1.week.from_now.httpdate, cache_control: 'max-age=315576000' }

    config.asset_host = "https://%s" % ENV["ASSET_HOST"]
    config.enable_processing                = true
    config.aws_authenticated_url_expiration = 60 * 60 * 24 * 7
  end

end

Configuration

The following config attributes must be set for this to work properly.

CarrierWave::Blitline.s3_bucket_name          = ENV["S3_BUCKET_NAME"]
CarrierWave::Blitline.s3_bucket_region        = ENV["S3_BUCKET_REGION"]
CarrierWave::Blitline.blitline_application_id = ENV["BLITLINE_APPLICATION_ID"]

Usage

Define your carrierwave versions as you normally would.

Basic functions (resize_to_fit, resize_to_fill, etc.) are dealt with automagically.

For other functions, you need to write two methods in your uploader: 1) The local processing method, 2) the params for Blitline. For example

# Images will be cropped, and then resized to fill
version :cropped do
  process :crop
  process :resize_to_fill => [200, 200]
end

# Use this when processing locally
def crop
  manipulate! do |img|
    img = img.crop "#{model.photo_crop_x}x#{model.photo_crop_y}+#{model.photo_crop_width}+#{model.photo_crop_height}"
    img
  end
end

# Use this when processing on Blitline
def params_for_crop(*)
  return {
    x: model.photo_crop_x,
    y: model.photo_crop_y,
    width: model.photo_crop_width,
    height: model.photo_crop_height
  }
end

Development

After checking out the repo, run bin/setup to install dependencies. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/katanacode/carrierwave-blitline.

License

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

Created by

Katana — web developers based in Edinburgh, Scotland