Module: DataMapper::CouchResource::Attachments

Defined in:
lib/couchdb_adapter/attachments.rb

Class Method Summary collapse

Class Method Details

.included(mod) ⇒ Object 



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# File 'lib/couchdb_adapter/attachments.rb', line 12

def self.included(mod)
  mod.class_eval do

    def add_attachment(file, options = {})
      assert_attachments_property

      filename = File.basename(file.path)

      content_type = options[:content_type] || begin
        mime_types = MIME::Types.of(filename)
        mime_types.empty? ? 'application/octet-stream' : mime_types.first.content_type
      end

      name = options[:name] || filename
      data = file.read

      if new_record? || !model.properties.has_property?(:rev)
        self.attachments ||= {}
        self.attachments[name] = {
          'content_type' => content_type,
          'data'         => Base64.encode64(data).chomp,
        }
      else
        adapter = repository.adapter
        http = Net::HTTP.new(adapter.uri.host, adapter.uri.port)
        uri = Addressable::URI.encode_component("#{attachment_path(name)}?rev=#{self.rev}")
        headers = {
          'Content-Length' => data.size.to_s,
          'Content-Type'   => content_type,
        }
        http.put(uri, data, headers)
        self.reload
      end

    end

    def delete_attachment(name)
      assert_attachments_property

      attachment = self.attachments[name] if self.attachments

      unless attachment
        return false
      end

      response = unless new_record?
        adapter = repository.adapter
        http = Net::HTTP.new(adapter.uri.host, adapter.uri.port)
        uri = Addressable::URI.encode_component("#{attachment_path(name)}?rev=#{self.rev}")
        http.delete(uri, 'Content-Type' => attachment['content_type'])
      end

      if response && !response.kind_of?(Net::HTTPSuccess)
        false
      else
        self.attachments.delete(name)
        self.attachments = nil if self.attachments.empty?
        true
      end
    end

    # TODO: cache data on model? (don't want to make resource dirty though...)
    def get_attachment(name)
      assert_attachments_property

      attachment = self.attachments[name] if self.attachments

      unless self.id && attachment
        nil
      else
        adapter = repository.adapter
        http = Net::HTTP.new(adapter.uri.host, adapter.uri.port)
        uri = Addressable::URI.encode_component(attachment_path(name))
        response, data = http.get(uri, 'Content-Type' => attachment['content_type'])

        unless response.kind_of?(Net::HTTPSuccess)
          nil
        else
          data
        end
      end

    end

    private

    def attachment_path(name)
      if new_record?
        nil
      else
        "/#{repository.adapter.escaped_db_name}/#{self.id}/#{name}"
      end
    end

    def assert_attachments_property
      property = model.properties[:attachments]

      unless property &&
        property.type == DataMapper::Types::JsonObject &&
        property.field == '_attachments'
        raise ArgumentError, "Attachments require   property :attachments, JsonObject, :field => '_attachments'"
      end
    end

  end

end