Class: Cas::MediaFile

Inherits:
ApplicationRecord show all
Defined in:
app/models/cas/media_file.rb

Defined Under Namespace

Classes: UnknownFileService, UnknownPath

Instance Method Summary collapse

Instance Method Details

#site ⇒ Object 



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# File 'app/models/cas/media_file.rb', line 18

def site
  attachable.site || raise("Attachable doesn't have a Cas::Site association")
end

#url(version:, use_cdn: true) ⇒ Object 



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# File 'app/models/cas/media_file.rb', line 22

def url(version:, use_cdn: true)
  cdn = ENV.fetch("CDN_HOST", nil) if use_cdn

  # When `path` is present, it means no gem was used for uploads, therefore
  # the image has to be treat as raw URL.
  if path.present?
    if service.downcase == "s3"
      bucket = ENV.fetch('S3_BUCKET')
      region = ENV.fetch('S3_REGION', "s3")
      if cdn
        host = cdn
      else
        host = "https://s3-#{region}.amazonaws.com/#{bucket}"
      end

      [host, path].join("/").gsub(/([^:])\/\//, '\1/')
    else
      raise UnknownFileService
    end

  # Shrine gem uses `file_data` because `file` is the name we specified for
  # the Attachment at the top of this model.
  elsif JSON.parse(file_data).present?
    params = {
      public: true
    }
    params[:host] = cdn if cdn.present?

    # With Shrine, the default image version is :original. Other versions
    # are called derivatives. The `file_url` method expects a derivative
    # name as first argument.
    #
    # When we pass :original, it just returns `nil` because the main file is
    # not considered a derivative. If we had something like :larger, then
    # that would be the argument.
    url = if version.to_sym == :original
            file_url(params)
          else
            file_url(version, params)
          end

    # Shrine 3 returns `nil` when a derivative doesn't exist. It also
    # returns `nil` when we pass parameters. This is a fallback way of
    # avoiding any `nil` returns. However, notice that we can't pass
    # `params` because Shrine just ignores it and returns `nil` if it's
    # present (it wasn't like that in Shrine 2).
    url = file_url if url.blank?

    # Amazon S3 has URLs that include some query strings like signatures
    # which we don't want to include in URLs.
    url&.gsub(/\?.*/, "")
  else
    raise UnknownPath
  end
end