fog is a modern and versatile cloud computing library for Ruby. Among others, it supports Amazon S3 to store your files. In contrast to the outdated AWS-S3 gem it is actively maintained and supports multiple locations. Amazon's S3 file hosting service is a scalable, easy place to store files for distribution. You can find out more about it at aws.amazon.com/s3 There are a few fog-specific options for has_attached_file, which will be explained using S3 as an example:
fog_credentials: Takes a Hash with your credentials. For S3, you can use the following format:
aws_access_key_id: '<your aws_access_key_id>' aws_secret_access_key: '<your aws_secret_access_key>' provider: 'AWS' region: 'eu-west-1'
fog_directory: This is the name of the S3 bucket that will store your files. Remember that the bucket must be unique across all of Amazon S3. If the bucket does not exist, Paperclip will attempt to create it.
+fog_file*: This can be hash or lambda returning hash. The value is used as base properties for new uploaded file.
path: This is the key under the bucket in which the file will be stored. The URL will be constructed from the bucket and the path. This is what you will want to interpolate. Keys should be unique, like filenames, and despite the fact that S3 (strictly speaking) does not support directories, you can still use a / to separate parts of your file name.
fog_public: (optional, defaults to true) Should the uploaded files be public or not? (true/false)
fog_host: (optional) The fully-qualified domain name (FQDN) that is the alias to the S3 domain of your bucket, e.g. 'images.example.com'. This can also be used in conjunction with Cloudfront (aws.amazon.com/cloudfront)
# File lib/paperclip/storage/fog.rb, line 37 def self.extended base begin require 'fog' rescue LoadError => e e.message << " (You may need to install the fog gem)" raise e end unless defined?(Fog) base.instance_eval do unless @options[:url].to_s.match(/^:fog.*url$/) @options[:path] = @options[:path].gsub(/:url/, @options[:url]).gsub(/^:rails_root\/public\/system\//, '') @options[:url] = ':fog_public_url' end Paperclip.interpolates(:fog_public_url) do |attachment, style| attachment.public_url(style) end unless Paperclip::Interpolations.respond_to? :fog_public_url end end
# File lib/paperclip/storage/fog.rb, line 161 def copy_to_local_file(style, local_dest_path) log("copying #{path(style)} to local file #{local_dest_path}") ::File.open(local_dest_path, 'wb') do |local_file| file = directory.files.get(path(style)) local_file.write(file.body) end rescue ::Fog::Errors::Error => e warn("#{e} - cannot copy #{path(style)} to local file #{local_dest_path}") false end
# File lib/paperclip/storage/fog.rb, line 58 def exists?(style = default_style) if original_filename !!directory.files.head(path(style)) else false end end
# File lib/paperclip/storage/fog.rb, line 141 def expiring_url(time = (Time.now + 3600), style = default_style) if directory.files.respond_to?(:get_http_url) expiring_url = directory.files.get_http_url(path(style), time) if @options[:fog_host] expiring_url.gsub!(/#{host_name_for_directory}/, dynamic_fog_host_for_style(style)) end else expiring_url = public_url end return expiring_url end
# File lib/paperclip/storage/fog.rb, line 121 def flush_deletes for path in @queued_for_delete do log("deleting #{path}") directory.files.new(:key => path).destroy end @queued_for_delete = [] end
# File lib/paperclip/storage/fog.rb, line 95 def flush_writes for style, file in @queued_for_write do log("saving #{path(style)}") retried = false begin directory.files.create(fog_file.merge( :body => file, :key => path(style), :public => fog_public(style), :content_type => file.content_type )) rescue Excon::Errors::NotFound raise if retried retried = true directory.save retry ensure file.rewind end end after_flush_writes # allows attachment to clean up temp files @queued_for_write = {} end
# File lib/paperclip/storage/fog.rb, line 66 def fog_credentials @fog_credentials ||= parse_credentials(@options[:fog_credentials]) end
# File lib/paperclip/storage/fog.rb, line 70 def fog_file @fog_file ||= begin value = @options[:fog_file] if !value {} elsif value.respond_to?(:call) value.call(self) else value end end end
# File lib/paperclip/storage/fog.rb, line 83 def fog_public(style = default_style) if @options.has_key?(:fog_public) if @options[:fog_public].respond_to?(:has_key?) && @options[:fog_public].has_key?(style) @options[:fog_public][style] else @options[:fog_public] end else true end end
# File lib/paperclip/storage/fog.rb, line 155 def parse_credentials(creds) creds = find_credentials(creds).stringify_keys env = Object.const_defined?(:Rails) ? Rails.env : nil (creds[env] || creds).symbolize_keys end
# File lib/paperclip/storage/fog.rb, line 129 def public_url(style = default_style) if @options[:fog_host] "#{dynamic_fog_host_for_style(style)}/#{path(style)}" else if fog_credentials[:provider] == 'AWS' "https://#{host_name_for_directory}/#{path(style)}" else directory.files.new(:key => path(style)).public_url end end end
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