You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: streams_controller.rb
    path of file: ./repos/diaspora/app/controllers/api/v1
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Api
  module V1
    class StreamsController < Api::V1::BaseController
      before_action do
        require_access_token %w[public:read]
      end

      before_action only: %w[aspects] do
        require_access_token %w
    
      def stream_responder(stream_klass=nil, query_time_field="posts.created_at", data_time_field="created_at")
        @stream = stream_klass.present? ? stream_klass.new(current_user, max_time: stream_max_time) : @stream
        query = @stream.stream_posts
        query = query.where(public: true) unless private_read?
        posts_page = pager(query, query_time_field, data_time_field).response
        posts_page[:data] = posts_page[:data].map {|post| PostPresenter.new(post, current_user).as_api_response }
        posts_page[:links].delete(:previous)
        render_paged_api_response posts_page
      end