btrc-hub/backend/app/controllers/wiki_pages_controller.rb

class WikiPagesController < ApplicationController
  def show
    wiki_page = WikiPage.find(params[:id])
    return head :not_found unless wiki_page

    render json: wiki_page.as_json.merge(body: wiki_page.body)
  end

  def show_by_title
    wiki_page = WikiPage.find_by(title: params[:title])
    return head :not_found unless wiki_page

    render json: wiki_page.as_json.merge(body: wiki_page.body)
  end

  def create
    return head :unauthorized unless current_user
    return head :forbidden unless ['admin', 'member'].include?(current_user.role)

    wiki_page = WikiPage.new(title: params[:title], created_user: current_user, updated_user: current_user)
    if wiki_page.save
      wiki_page.set_body params[:body], user: current_user
      render json: wiki_page, status: :created
    else
      render json: { errors: wiki_page.errors.full_messages }, status: :unprocessable_entity
    end
  end

  def update
    return head :unauthorized unless current_user
    return head :forbidden unless ['admin', 'member'].include?(current_user.role)

    wiki_page = WikiPage.find(params[:id])
    return head :not_found unless wiki_page

    wiki_page.updated_user = current_user
    wiki_page.set_body params[:body], user: current_user
    wiki_page.save!
    head :ok
  end

  def search
    q = WikiPage.all

    if params[:title].present?
      title = params[:title].to_s.strip
      q = q.where('title LIKE ?', "%#{ WikiPage.sanitize_sql_like(title) }%")
    end

    render json: q.limit(20)
  end

  def changes
    id = params[:id]
    log = id.present? ? wiki.page("#{ id }.md").versions : wiki.repo.log('main', nil, max_count: 50)
    render json: log.map { |commit|
        { sha:        commit.id,
          author:     commit.author.name,
          message:    commit.message,
          timestamp:  commit.authored_date } }
  end

  private

  WIKI_PATH = Rails.root.join('wiki').to_s

  def wiki
    @wiki ||= Gollum::Wiki.new(WIKI_PATH)
  end
end