hernan · April 19, 2016 22:57 · Aug 14, 2014
diff --git a/carrier_wave.rb b/carrier_wave.rb
@@ -0,0 +1,68 @@
+# NullStorage provider for CarrierWave for use in tests.  Doesn't actually
+# upload or store files but allows test to pass as if files were stored and
+# the use of fixtures.
+class NullStorage
+  attr_reader :uploader
+
+  def initialize(uploader)
+    @uploader = uploader
+  end
+
+  def identifier
+    uploader.filename
+  end
+
+  def store!(_file)
+    true
+  end
+
+  def retrieve!(_identifier)
+    true
+  end
+end
+
+CarrierWave.configure do |config|
+  # Make the tmp dir work on Heroku
+  config.cache_dir = "#{Rails.root}/tmp/uploads"
+
+  if Rails.env.production? || Rails.env.staging?
+    config.storage :fog
+    config.fog_credentials = {
+      provider:               "AWS",
+      # When precompiling assets Fog will be initialized and needs to be
+      # initialized (even though it will never touch S3), provide some values
+      # to prevent Fog gem from crashing during initialize wihtout actually
+      # giving away the keys.
+      aws_access_key_id:      ENV["S3_KEY"] || "S3_KEY",
+      aws_secret_access_key:  ENV["S3_SECRET"] || "S3_SECRET"
+    }
+
+    config.fog_directory  = ENV["S3_BUCKET"]
+    # App requires explicit protocol to be specified for uploaded assets
+    # Do not change to "//..." like we are doing with the other asset hosts
+    config.asset_host     = "https://#{ENV["S3_CDN_HOST"]}"
+    config.fog_attributes = { "Cache-Control" => "max-age=315576000" }
+
+  elsif Rails.env.development?
+    config.storage :file
+    config.asset_host = "http://#{ENV["S3_CDN_HOST"] || ENV["HOST"]}"
+
+  elsif Rails.env.test?
+    config.storage NullStorage
+    # Required to prevent FactoryGirl from giving an infuriating exception
+    # ArgumentError: wrong exec option
+    # It also speeds up tests so it's a good idea
+    config.enable_processing = false
+  end
+end
+
+# https://gist.github.com/1058477
+module CarrierWave::MiniMagick
+  def quality(percentage)
+    manipulate! do |img|
+      img.quality(percentage.to_s)
+      img = yield(img) if block_given?
+      img
+    end
+  end
+end