discourse/app/controllers/bootstrap_controller.rb

# frozen_string_literal: true

class BootstrapController < ApplicationController
  include ApplicationHelper

  skip_before_action :redirect_to_login_if_required, :check_xhr

  # This endpoint allows us to produce the data required to start up Discourse via JSON API,
  # so that you don't have to scrape the HTML for `data-*` payloads
  def index
    locale = script_asset_path("locales/#{I18n.locale}")

    preload_anonymous_data
    if current_user
      current_user.sync_notification_channel_position
      preload_current_user_data
    end

    @stylesheets = []

    add_scheme(scheme_id, "all", "light-scheme")
    add_scheme(dark_scheme_id, "(prefers-color-scheme: dark)", "dark-scheme")

    if rtl?
      add_style(mobile_view? ? :mobile_rtl : :desktop_rtl)
    else
      add_style(mobile_view? ? :mobile : :desktop)
    end
    add_style(:admin) if staff?
    add_style(:wizard) if admin?

    assets_fake_request = ActionDispatch::Request.new(request.env.dup)
    assets_for_url = params[:for_url]
    if assets_for_url
      path, query = assets_for_url.split("?", 2)
      assets_fake_request.env["PATH_INFO"] = path
      assets_fake_request.env["QUERY_STRING"] = query
    end

    Discourse
      .find_plugin_css_assets(
        include_official: allow_plugins?,
        include_unofficial: allow_third_party_plugins?,
        mobile_view: mobile_view?,
        desktop_view: !mobile_view?,
        request: assets_fake_request,
      )
      .each { |file| add_style(file, plugin: true) }
    add_style(mobile_view? ? :mobile_theme : :desktop_theme) if theme_id.present?

    extra_locales = []
    if ExtraLocalesController.client_overrides_exist?
      extra_locales << ExtraLocalesController.url("overrides")
    end

    extra_locales << ExtraLocalesController.url("admin") if staff?

    extra_locales << ExtraLocalesController.url("wizard") if admin?

    plugin_js =
      Discourse
        .find_plugin_js_assets(
          include_official: allow_plugins?,
          include_unofficial: allow_third_party_plugins?,
          request: assets_fake_request,
        )
        .map { |f| script_asset_path(f) }

    plugin_test_js =
      if Rails.env != "production"
        script_asset_path("plugin-tests")
      else
        []
      end

    bootstrap = {
      theme_id: theme_id,
      theme_color: "##{ColorScheme.hex_for_name("header_background", scheme_id)}",
      title: SiteSetting.title,
      current_homepage: current_homepage,
      locale_script: locale,
      stylesheets: @stylesheets,
      plugin_js: plugin_js,
      plugin_test_js: plugin_test_js,
      setup_data: client_side_setup_data,
      preloaded: @preloaded,
      html: create_html,
      theme_html: create_theme_html,
      html_classes: html_classes,
      html_lang: html_lang,
      login_path: main_app.login_path,
      authentication_data: authentication_data,
    }
    bootstrap[:extra_locales] = extra_locales if extra_locales.present?
    bootstrap[:csrf_token] = form_authenticity_token if current_user

    render_json_dump(bootstrap: bootstrap)
  end

  def plugin_css_for_tests
    urls =
      Discourse
        .find_plugin_css_assets(include_disabled: true, desktop_view: true)
        .map do |target|
          details = Stylesheet::Manager.new().stylesheet_details(target, "all")
          details[0][:new_href]
        end

    stylesheet = <<~CSS
      /* For use in tests only - `@import`s all plugin stylesheets */
      #{urls.map { |url| "@import \"#{url}\";" }.join("\n")}
    CSS

    render plain: stylesheet, content_type: "text/css"
  end

  private

  def add_scheme(scheme_id, media, css_class)
    return if scheme_id.to_i == -1

    if style =
         Stylesheet::Manager.new(theme_id: theme_id).color_scheme_stylesheet_details(
           scheme_id,
           media,
         )
      @stylesheets << { href: style[:new_href], media: media, class: css_class }
    end
  end

  def add_style(target, opts = nil)
    if styles = Stylesheet::Manager.new(theme_id: theme_id).stylesheet_details(target, "all")
      styles.each do |style|
        @stylesheets << {
          href: style[:new_href],
          media: "all",
          theme_id: style[:theme_id],
          target: style[:target],
        }.merge(opts || {})
      end
    end
  end

  def create_html
    html = {}
    return html unless allow_plugins?

    add_plugin_html(html, :before_body_close)
    add_plugin_html(html, :before_head_close)
    add_plugin_html(html, :before_script_load)
    add_plugin_html(html, :header)

    html
  end

  def add_plugin_html(html, key)
    add_if_present(
      html,
      key,
      DiscoursePluginRegistry.build_html("server:#{key.to_s.dasherize}", self),
    )
  end

  def create_theme_html
    theme_html = {}
    return theme_html if customization_disabled?

    theme_view = mobile_view? ? :mobile : :desktop

    add_if_present(theme_html, :body_tag, Theme.lookup_field(theme_id, theme_view, "body_tag"))
    add_if_present(theme_html, :head_tag, Theme.lookup_field(theme_id, theme_view, "head_tag"))
    add_if_present(theme_html, :header, Theme.lookup_field(theme_id, theme_view, "header"))
    add_if_present(
      theme_html,
      :translations,
      Theme.lookup_field(theme_id, :translations, I18n.locale),
    )
    add_if_present(theme_html, :js, Theme.lookup_field(theme_id, :extra_js, nil))

    theme_html
  end

  def add_if_present(hash, key, val)
    hash[key] = val if val.present?
  end
end