mastodon/app/controllers/accounts_controller.rb

class AccountsController < ApplicationController
  layout 'public'

  before_action :set_account
  before_action :set_link_headers

  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)
      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 follow
    FollowService.new.call(current_user.account, @account.acct)
    redirect_to account_path(@account)
  end

  def unfollow
    UnfollowService.new.call(current_user.account, @account)
    redirect_to account_path(@account)
  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_link_headers
    response.headers['Link'] = LinkHeader.new([
      [webfinger_account_url, [['rel', 'lrdd'], ['type', 'application/xrd+xml']]],
      [account_url(@account, format: 'atom'), [['rel', 'alternate'], ['type', 'application/atom+xml']]]
    ])
  end

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