mastodon/app/controllers/accounts_controller.rb

class AccountsController < ApplicationController
  layout 'public'

  before_action :set_account
  before_action :set_webfinger_header

  def show
    respond_to do |format|
      format.html do
        @statuses   = @account.statuses.order('id desc').with_includes.with_counters.paginate(page: params[:page], per_page: 10)

        if user_signed_in?
          status_ids  = @statuses.collect { |s| [s.id, s.reblog_of_id] }.flatten.uniq
          @favourited = Status.favourites_map(status_ids, current_user.account_id)
          @reblogged  = Status.reblogs_map(status_ids, current_user.account_id)
        else
          @favourited = {}
          @reblogged  = {}
        end
      end

      format.atom do
        @entries = @account.stream_entries.order('id desc').with_includes.paginate_by_max_id(20, params[:max_id] || nil)
      end
    end
  end

  def followers
    @followers = @account.followers.order('follows.created_at desc').paginate(page: params[:page], per_page: 6)
  end

  def following
    @following = @account.following.order('follows.created_at desc').paginate(page: params[:page], per_page: 6)
  end

  private

  def set_account
    @account = Account.find_local!(params[:username])
  end

  def set_webfinger_header
    response.headers['Link'] = "<#{webfinger_account_url}>; rel=\"lrdd\"; type=\"application/xrd+xml\""
  end

  def webfinger_account_url
    webfinger_url(resource: "acct:#{@account.acct}@#{Rails.configuration.x.local_domain}")
  end
end