module ActionDispatch
  module Http
    # Models uploaded files.
    #
    # The actual file is accessible via the +tempfile+ accessor, though some
    # of its interface is available directly for convenience.
    #
    # Uploaded files are temporary files whose lifespan is one request. When
    # the object is finalized Ruby unlinks the file, so there is no need to
    # clean them with a separate maintenance task.
    class UploadedFile
      # The basename of the file in the client.
      attr_accessor :original_filename

      # A string with the MIME type of the file.
      attr_accessor :content_type

      # A +Tempfile+ object with the actual uploaded file. Note that some of
      # its interface is available directly.
      attr_accessor :tempfile
      alias :to_io :tempfile

      # A string with the headers of the multipart request.
      attr_accessor :headers

      def initialize(hash) # :nodoc:
        @tempfile          = hash[:tempfile]
        raise(ArgumentError, ':tempfile is required') unless @tempfile

        if hash[:filename]
          @original_filename = hash[:filename].dup

          begin
            @original_filename.encode!(Encoding::UTF_8)
          rescue EncodingError
            @original_filename.force_encoding(Encoding::UTF_8)
          end
        else
          @original_filename = nil
        end

        @content_type      = hash[:type]
        @headers           = hash[:head]
      end

      # Shortcut for +tempfile.read+.
      def read(length=nil, buffer=nil)
        @tempfile.read(length, buffer)
      end

      # Shortcut for +tempfile.open+.
      def open
        @tempfile.open
      end

      # Shortcut for +tempfile.close+.
      def close(unlink_now=false)
        @tempfile.close(unlink_now)
      end

      # Shortcut for +tempfile.path+.
      def path
        @tempfile.path
      end

      # Shortcut for +tempfile.rewind+.
      def rewind
        @tempfile.rewind
      end

      # Shortcut for +tempfile.size+.
      def size
        @tempfile.size
      end

      # Shortcut for +tempfile.eof?+.
      def eof?
        @tempfile.eof?
      end
    end
  end
end
