Module: ReactOnRails::Helper

Includes:
ProHelper, Utils::Required, ScoutApm::Tracer
Included in:
ReactOnRailsHelper
Defined in:
lib/react_on_rails/helper.rb

Constant Summary collapse

COMPONENT_HTML_KEY = 
"componentHtml"

Instance Method Summary collapse

Methods included from ProHelper

#generate_component_script, #generate_store_script

Methods included from Utils::Required

#required

Instance Method Details

#build_react_component_result_for_server_rendered_hash(server_rendered_html: required("server_rendered_html"), component_specification_tag: required("component_specification_tag"), console_script: required("console_script"), render_options: required("render_options")) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 449

def build_react_component_result_for_server_rendered_hash(
  server_rendered_html: required("server_rendered_html"),
  component_specification_tag: required("component_specification_tag"),
  console_script: required("console_script"),
  render_options: required("render_options")
)
  content_tag_options = render_options.html_options
  content_tag_options[:id] = render_options.dom_id

  unless server_rendered_html[COMPONENT_HTML_KEY]
    raise ReactOnRails::Error, "server_rendered_html hash expected to contain \"#{COMPONENT_HTML_KEY}\" key."
  end

  rendered_output = content_tag(:div,
                                server_rendered_html[COMPONENT_HTML_KEY].html_safe,
                                content_tag_options)

  result_console_script = render_options.replay_console ? wrap_console_script_with_nonce(console_script) : ""
  result = compose_react_component_html_with_spec_and_console(
    component_specification_tag, rendered_output, result_console_script
  )

  # Other HTML strings need to be marked as html_safe too:
  server_rendered_hash_except_component = server_rendered_html.except(COMPONENT_HTML_KEY)
  server_rendered_hash_except_component.each do |key, html_string|
    server_rendered_hash_except_component[key] = html_string.html_safe
  end

  result_with_rails_context = prepend_render_rails_context(result)
  { COMPONENT_HTML_KEY => result_with_rails_context }.merge(
    server_rendered_hash_except_component
  )
end

#build_react_component_result_for_server_rendered_string(server_rendered_html: required("server_rendered_html"), component_specification_tag: required("component_specification_tag"), console_script: required("console_script"), render_options: required("render_options")) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 422

def build_react_component_result_for_server_rendered_string(
  server_rendered_html: required("server_rendered_html"),
  component_specification_tag: required("component_specification_tag"),
  console_script: required("console_script"),
  render_options: required("render_options")
)
  content_tag_options = render_options.html_options
  if content_tag_options.key?(:tag)
    content_tag_options_html_tag = content_tag_options[:tag]
    content_tag_options.delete(:tag)
  else
    content_tag_options_html_tag = "div"
  end
  content_tag_options[:id] = render_options.dom_id

  rendered_output = content_tag(content_tag_options_html_tag.to_sym,
                                server_rendered_html.html_safe,
                                content_tag_options)

  result_console_script = render_options.replay_console ? wrap_console_script_with_nonce(console_script) : ""
  result = compose_react_component_html_with_spec_and_console(
    component_specification_tag, rendered_output, result_console_script
  )

  prepend_render_rails_context(result)
end

#compose_react_component_html_with_spec_and_console(component_specification_tag, rendered_output, console_script) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 509

def compose_react_component_html_with_spec_and_console(component_specification_tag, rendered_output,
                                                       console_script)
  # IMPORTANT: Ensure that we mark string as html_safe to avoid escaping.
  added_html = "#{component_specification_tag}\n#{console_script}".strip
  added_html = added_html.present? ? "\n#{added_html}" : ""

  "#{rendered_output}#{added_html}".html_safe
end

#create_render_options(react_component_name, options) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 404

def create_render_options(react_component_name, options)
  # If no store dependencies are passed, default to all registered stores up till now
  unless options.key?(:store_dependencies)
    store_dependencies = registered_stores_including_deferred.map { |store| store[:store_name] }
    options = options.merge(store_dependencies: store_dependencies.presence)
  end
  ReactOnRails::ReactComponent::RenderOptions.new(react_component_name: react_component_name,
                                                  options: options)
end

#generated_components_pack_path(component_name) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 414

def generated_components_pack_path(component_name)
  "#{ReactOnRails::PackerUtils.packer_source_entry_path}/generated/#{component_name}.js"
end

#generated_stores_pack_path(store_name) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 418

def generated_stores_pack_path(store_name)
  "#{ReactOnRails::PackerUtils.packer_source_entry_path}/generated/#{store_name}.js"
end

#in_mailer? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/react_on_rails/helper.rb', line 706

def in_mailer?
  return false unless defined?(controller)
  return false unless defined?(ActionMailer::Base)

  controller.is_a?(ActionMailer::Base)
end

#initialize_redux_stores(render_options) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 676

def initialize_redux_stores(render_options)
  result = +<<-JS
  ReactOnRails.clearHydratedStores();
  JS

  store_dependencies = render_options.store_dependencies
  return result unless store_dependencies.present?

  declarations = +"var reduxProps, store, storeGenerator;\n"
  store_objects = registered_stores_including_deferred.select do |store|
    store_dependencies.include?(store[:store_name])
  end

  result << store_objects.each_with_object(declarations) do |redux_store_data, memo|
    store_name = redux_store_data[:store_name]
    props = props_string(redux_store_data[:props])
    memo << <<-JS.strip_heredoc
    reduxProps = #{props};
    storeGenerator = ReactOnRails.getStoreGenerator('#{store_name}');
    store = storeGenerator(reduxProps, railsContext);
    ReactOnRails.setStore('#{store_name}', store);
    JS
  end
  result
end

#internal_react_component(react_component_name, options = {}) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 551

def internal_react_component(react_component_name, options = {})
  # Create the JavaScript and HTML to allow either client or server rendering of the
  # react_component.
  #
  # Create the JavaScript setup of the global to initialize the client rendering
  # (re-hydrate the data). This enables react rendered on the client to see that the
  # server has already rendered the HTML.

  render_options = create_render_options(react_component_name, options)

  # Setup the page_loaded_js, which is the same regardless of prerendering or not!
  # The reason is that React is smart about not doing extra work if the server rendering did its job.
  component_specification_tag = generate_component_script(render_options)

  load_pack_for_generated_component(react_component_name, render_options)
  # Create the HTML rendering part
  result = server_rendered_react_component(render_options)

  {
    render_options: render_options,
    tag: component_specification_tag,
    result: result
  }
end

#json_safe_and_pretty(hash_or_string) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 265

def json_safe_and_pretty(hash_or_string)
  return "{}" if hash_or_string.nil?

  unless hash_or_string.is_a?(String) || hash_or_string.is_a?(Hash)
    raise ReactOnRails::Error, "#{__method__} only accepts String or Hash as argument " \
                               "(#{hash_or_string.class} given)."
  end

  json_value = hash_or_string.is_a?(String) ? hash_or_string : hash_or_string.to_json

  ReactOnRails::JsonOutput.escape(json_value)
end

#load_pack_for_generated_component(react_component_name, render_options) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 344

def load_pack_for_generated_component(react_component_name, render_options)
  return unless render_options.auto_load_bundle

  ReactOnRails::PackerUtils.raise_nested_entries_disabled unless ReactOnRails::PackerUtils.nested_entries?
  if Rails.env.development?
    is_component_pack_present = File.exist?(generated_components_pack_path(react_component_name))
    raise_missing_autoloaded_bundle(react_component_name) unless is_component_pack_present
  end

  options = { defer: ReactOnRails.configuration.generated_component_packs_loading_strategy == :defer }
  # Old versions of Shakapacker don't support async script tags.
  # ReactOnRails.configure already validates if async loading is supported by the installed Shakapacker version.
  # Therefore, we only need to pass the async option if the loading strategy is explicitly set to :async
  options[:async] = true if ReactOnRails.configuration.generated_component_packs_loading_strategy == :async
  append_javascript_pack_tag("generated/#{react_component_name}", **options)
  append_stylesheet_pack_tag("generated/#{react_component_name}")
end

#load_pack_for_generated_store(store_name, explicit_auto_load: false) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 362

def load_pack_for_generated_store(store_name, explicit_auto_load: false)
  unless ReactOnRails.configuration.stores_subdirectory.present?
    if explicit_auto_load
      raise ReactOnRails::SmartError.new(
        error_type: :configuration_error,
        details: "auto_load_bundle is enabled for store " \
                 "'#{store_name}', but " \
                 "stores_subdirectory is not configured. " \
                 "Set config.stores_subdirectory (e.g., " \
                 "'ror_stores') in your ReactOnRails " \
                 "configuration so that store packs can " \
                 "be generated and loaded."
      )
    end
    return
  end

  ReactOnRails::PackerUtils.raise_nested_entries_disabled unless ReactOnRails::PackerUtils.nested_entries?
  if Rails.env.development?
    is_store_pack_present = File.exist?(generated_stores_pack_path(store_name))
    raise_missing_autoloaded_store_bundle(store_name) unless is_store_pack_present
  end

  options = { defer: ReactOnRails.configuration.generated_component_packs_loading_strategy == :defer }
  options[:async] = true if ReactOnRails.configuration.generated_component_packs_loading_strategy == :async
  append_javascript_pack_tag("generated/#{store_name}", **options)
end

#prepend_render_rails_context(render_value) ⇒ Object

prepend the rails_context if not yet applied



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# File 'lib/react_on_rails/helper.rb', line 545

def prepend_render_rails_context(render_value)
  rails_context_content = rails_context_if_not_already_rendered
  rails_context_content = rails_context_content.present? ? "#{rails_context_content}\n" : ""
  "#{rails_context_content}#{render_value}".html_safe
end

#props_string(props) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 582

def props_string(props)
  props.is_a?(String) ? props : props.to_json
end

#rails_context(server_side: true) ⇒ Object

This is the definitive list of the default values used for the rails_context, which is the second parameter passed to both component and store Render-Functions. This method can be called from views and from the controller, as ‘helpers.rails_context`

rubocop:disable Metrics/AbcSize, Metrics/CyclomaticComplexity



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# File 'lib/react_on_rails/helper.rb', line 283

def rails_context(server_side: true)
  # ALERT: Keep in sync with packages/react-on-rails/src/types/index.ts for the properties of RailsContext
  @rails_context ||= begin
    result = {
      componentRegistryTimeout: ReactOnRails.configuration.component_registry_timeout,
      railsEnv: Rails.env,
      inMailer: in_mailer?,
      # Locale settings
      i18nLocale: I18n.locale,
      i18nDefaultLocale: I18n.default_locale,
      rorVersion: ReactOnRails::VERSION,
      # TODO: v13 just use the version if existing
      rorPro: ReactOnRails::Utils.react_on_rails_pro?
    }

    if ReactOnRails::Utils.react_on_rails_pro?
      result[:rorProVersion] = ReactOnRails::Utils.react_on_rails_pro_version

      if ReactOnRails::Utils.rsc_support_enabled?
        rsc_payload_url = ReactOnRailsPro.configuration.rsc_payload_generation_url_path
        result[:rscPayloadGenerationUrlPath] = rsc_payload_url
      end
    end

    if defined?(request) && request.present?
      # Check for encoding of the request's original_url and try to force-encoding the
      # URLs as UTF-8. This situation can occur in browsers that do not encode the
      # entire URL as UTF-8 already, mostly on the Windows platform (IE11 and lower).
      original_url_normalized = request.original_url
      if original_url_normalized.encoding == Encoding::BINARY
        original_url_normalized = original_url_normalized.force_encoding(Encoding::ISO_8859_1)
                                                         .encode(Encoding::UTF_8)
      end

      # Using Addressable instead of standard URI to better deal with
      # non-ASCII characters (see https://github.com/shakacode/react_on_rails/pull/405)
      uri = Addressable::URI.parse(original_url_normalized)
      # uri = Addressable::URI.parse("http://foo.com:3000/posts?id=30&limit=5#time=1305298413")

      result.merge!(
        # URL settings
        href: uri.to_s,
        location: "#{uri.path}#{"?#{uri.query}" if uri.query.present?}",
        scheme: uri.scheme, # http
        host: uri.host, # foo.com
        port: uri.port,
        pathname: uri.path, # /posts
        search: uri.query, # id=30&limit=5
        httpAcceptLanguage: request.env["HTTP_ACCEPT_LANGUAGE"]
      )
    end
    if ReactOnRails.configuration.rendering_extension
      custom_context = ReactOnRails.configuration.rendering_extension.custom_context(self)
      result.merge!(custom_context) if custom_context
    end
    result
  end

  @rails_context.merge(serverSide: server_side)
end

#rails_context_if_not_already_rendered ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 518

def rails_context_if_not_already_rendered
  return "" if @rendered_rails_context

  data = rails_context(server_side: false)

  @rendered_rails_context = true

  attribution_comment = react_on_rails_attribution_comment
  script_tag = content_tag(:script,
                           json_safe_and_pretty(data).html_safe,
                           type: "application/json",
                           id: "js-react-on-rails-context")

  "#{attribution_comment}\n#{script_tag}".html_safe
end

#raise_missing_autoloaded_bundle(react_component_name) ⇒ Object

Raises:



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# File 'lib/react_on_rails/helper.rb', line 720

def raise_missing_autoloaded_bundle(react_component_name)
  raise ReactOnRails::SmartError.new(
    error_type: :missing_auto_loaded_bundle,
    component_name: react_component_name,
    expected_path: generated_components_pack_path(react_component_name)
  )
end

#raise_missing_autoloaded_store_bundle(store_name) ⇒ Object

Raises:



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# File 'lib/react_on_rails/helper.rb', line 728

def raise_missing_autoloaded_store_bundle(store_name)
  raise ReactOnRails::SmartError.new(
    error_type: :missing_auto_loaded_store_bundle,
    component_name: store_name,
    expected_path: generated_stores_pack_path(store_name)
  )
end

#raise_prerender_error(json_result, react_component_name, props, js_code) ⇒ Object

Raises:



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# File 'lib/react_on_rails/helper.rb', line 586

def raise_prerender_error(json_result, react_component_name, props, js_code)
  raise ReactOnRails::PrerenderError.new(
    component_name: react_component_name,
    props: sanitized_props_string(props),
    err: nil,
    js_code: js_code,
    console_messages: json_result["consoleReplayScript"]
  )
end

#react_component(component_name, options = {}) ⇒ Object

react_component_name: can be a React function or class component or a “Render-Function”. “Render-Functions” differ from a React function in that they take two parameters, the

props and the railsContext, like this:

let MyReactComponentApp = (props, railsContext) => <MyReactComponent {...props}/>;

Alternately, you can define the Render-Function with an additional property
`.renderFunction = true`:

let MyReactComponentApp = (props) => <MyReactComponent {...props}/>;
MyReactComponent.renderFunction = true;

Exposing the react_component_name is necessary to both a plain ReactComponent as well as
  a generator:
See README.md for how to "register" your React components.
See spec/dummy/client/app/packs/server-bundle.js and
  spec/dummy/client/app/packs/client-bundle.js for examples of this.

options:

props: Ruby Hash or JSON string which contains the properties to pass to the react object. Do
   not pass any props if you are separately initializing the store by the `redux_store` helper.
prerender: <true/false> set to false when debugging!
id: You can optionally set the id, or else a unique one is automatically generated.
html_options: You can set other html attributes that will go on this component
trace: <true/false> set to true to print additional debugging information in the browser
       default is true for development, off otherwise
replay_console: <true/false> Default is true. False will disable echoing server rendering
                logs to browser. While this can make troubleshooting server rendering difficult,
                so long as you have the default configuration of logging_on_server set to
                true, you'll still see the errors on the server.
raise_on_prerender_error: <true/false> Default to false. True will raise exception on server
   if the JS code throws

Any other options are passed to the content tag, including the id. random_dom_id can be set to override the default from the config/initializers. That’s only used if you have multiple instance of the same component on the Rails view.



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# File 'lib/react_on_rails/helper.rb', line 59

def react_component(component_name, options = {})
  internal_result = internal_react_component(component_name, options)
  server_rendered_html = internal_result[:result]["html"]
  console_script = internal_result[:result]["consoleReplayScript"]
  render_options = internal_result[:render_options]

  case server_rendered_html
  when String
    html = build_react_component_result_for_server_rendered_string(
      server_rendered_html: server_rendered_html,
      component_specification_tag: internal_result[:tag],
      console_script: console_script,
      render_options: render_options
    )
    html.html_safe
  when Hash
    msg = <<~MSG
      Use react_component_hash (not react_component) to return a Hash to your ruby view code. See
      https://github.com/shakacode/react_on_rails/blob/master/spec/dummy/client/app/startup/ReactHelmetServerApp.jsx
      for an example of the necessary javascript configuration.
    MSG
    raise ReactOnRails::Error, msg
  else
    class_name = server_rendered_html.class.name
    msg = <<~MSG
      ReactOnRails: server_rendered_html is expected to be a String or Hash for #{component_name}.
      Type is #{class_name}
      Value:
      #{server_rendered_html}

      If you're trying to use a Render-Function to return a Hash to your ruby view code, then use
      react_component_hash instead of react_component and see
      https://github.com/shakacode/react_on_rails/blob/master/spec/dummy/client/app/startup/ReactHelmetServerApp.jsx
      for an example of the JavaScript code.
    MSG
    raise ReactOnRails::Error, msg
  end
end

#react_component_hash(component_name, options = {}) ⇒ Object

react_component_hash is used to return multiple HTML strings for server rendering, such as for adding meta-tags to a page. It is exactly like react_component except for the following:

  1. prerender: true is automatically added, as this method doesn’t make sense for client only rendering.

  2. Your JavaScript Render-Function for server rendering must return an Object rather than a React component.

  3. Your view code must expect an object and not a string.

Here is an example of the view code:

<% react_helmet_app = react_component_hash("ReactHelmetApp", prerender: true,
                                           props: { helloWorldData: { name: "Mr. Server Side Rendering"}},
                                           id: "react-helmet-0", trace: true) %>
<% content_for :title do %>
  <%= react_helmet_app['title'] %>
<% end %>
<%= react_helmet_app["componentHtml"] %>



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# File 'lib/react_on_rails/helper.rb', line 115

def react_component_hash(component_name, options = {})
  options[:prerender] = true

  internal_result = internal_react_component(component_name, options)
  server_rendered_html = internal_result[:result]["html"]
  console_script = internal_result[:result]["consoleReplayScript"]
  render_options = internal_result[:render_options]

  if server_rendered_html.is_a?(String) && internal_result[:result]["hasErrors"]
    server_rendered_html = { COMPONENT_HTML_KEY => internal_result[:result]["html"] }
  end

  if server_rendered_html.is_a?(Hash)
    build_react_component_result_for_server_rendered_hash(
      server_rendered_html: server_rendered_html,
      component_specification_tag: internal_result[:tag],
      console_script: console_script,
      render_options: render_options
    )

  else
    msg = <<~MSG
      Render-Function used by react_component_hash for #{component_name} is expected to return
      an Object. See https://github.com/shakacode/react_on_rails/blob/master/spec/dummy/client/app/startup/ReactHelmetServerApp.jsx
      for an example of the JavaScript code.
      Note, your Render-Function must either take 2 params or have the property
      `.renderFunction = true` added to it to distinguish it from a React Function Component.
    MSG
    raise ReactOnRails::Error, msg
  end
end

#react_on_rails_attribution_comment ⇒ Object

Generates the HTML attribution comment Pro version calls ReactOnRailsPro::Utils for license-specific details



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# File 'lib/react_on_rails/helper.rb', line 536

def react_on_rails_attribution_comment
  if ReactOnRails::Utils.react_on_rails_pro?
    ReactOnRailsPro::Utils.pro_attribution_comment
  else
    "<!-- Powered by React on Rails (c) ShakaCode | Open Source -->"
  end
end

#redux_store(store_name, props: {}, defer: false, immediate_hydration: nil, auto_load_bundle: nil) ⇒ Object

Separate initialization of store from react_component allows multiple react_component calls to use the same Redux store.

NOTE: This technique not recommended as it prevents dynamic code splitting for performance. Instead, you should use the standard react_component view helper.

store_name: name of the store, corresponding to your call to ReactOnRails.registerStores in your

JavaScript code. When using auto-bundling, this should match the filename of your
store file (e.g., "commentsStore" for commentsStore.js).

props: Ruby Hash or JSON string which contains the properties to pass to the redux store. Options

defer: false -- pass as true if you wish to render this below your component.
immediate_hydration: nil -- React on Rails Pro (licensed) feature. When nil (default), Pro users
                    get immediate hydration, non-Pro users don't. Can be explicitly overridden.
auto_load_bundle: nil -- If true, automatically loads the generated pack for this store.
                  Defaults to ReactOnRails.configuration.auto_load_bundle if not specified.
                  Requires config.stores_subdirectory to be set (e.g., "ror_stores").
                  Store files should be placed in directories matching this name, e.g.:
                    app/javascript/bundles/ror_stores/commentsStore.js
                  The store file must export default a store generator function.



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# File 'lib/react_on_rails/helper.rb', line 167

def redux_store(store_name, props: {}, defer: false, immediate_hydration: nil, auto_load_bundle: nil)
  immediate_hydration = ReactOnRails::Utils.normalize_immediate_hydration(immediate_hydration, store_name, "Store")

  # Auto-load store pack if configured
  should_auto_load = auto_load_bundle.nil? ? ReactOnRails.configuration.auto_load_bundle : auto_load_bundle
  load_pack_for_generated_store(store_name, explicit_auto_load: auto_load_bundle == true) if should_auto_load

  redux_store_data = { store_name: store_name,
                       props: props,
                       immediate_hydration: immediate_hydration }
  if defer
    registered_stores_defer_render << redux_store_data
    "YOU SHOULD NOT SEE THIS ON YOUR VIEW -- Uses as a code block, like <% redux_store %> " \
      "and not <%= redux store %>"
  else
    registered_stores << redux_store_data
    result = render_redux_store_data(redux_store_data)
    prepend_render_rails_context(result).html_safe
  end
end

#redux_store_hydration_data ⇒ Object

Place this view helper (no parameters) at the end of your shared layout. This tell ReactOnRails where to client render the redux store hydration data. Since we’re going to be setting up the stores in the controllers, we need to know where on the view to put the client side rendering of this hydration data, which is a hidden div with a matching class that contains a data props.



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# File 'lib/react_on_rails/helper.rb', line 193

def redux_store_hydration_data
  return if registered_stores_defer_render.blank?

  registered_stores_defer_render.reduce(+"") do |accum, redux_store_data|
    accum << render_redux_store_data(redux_store_data)
  end.html_safe
end

#registered_stores ⇒ Object

rubocop:enable Metrics/AbcSize, Metrics/CyclomaticComplexity



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# File 'lib/react_on_rails/helper.rb', line 392

def registered_stores
  @registered_stores ||= []
end

#registered_stores_defer_render ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 396

def registered_stores_defer_render
  @registered_stores_defer_render ||= []
end

#registered_stores_including_deferred ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 400

def registered_stores_including_deferred
  registered_stores + registered_stores_defer_render
end

#render_redux_store_data(redux_store_data) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 576

def render_redux_store_data(redux_store_data)
  store_hydration_data = generate_store_script(redux_store_data)

  prepend_render_rails_context(store_hydration_data)
end

#replay_console_option(val) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 702

def replay_console_option(val)
  val.nil? ? ReactOnRails.configuration.replay_console : val
end

#sanitized_props_string(props) ⇒ Object 



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# File 'lib/react_on_rails/helper.rb', line 201

def sanitized_props_string(props)
  ReactOnRails::JsonOutput.escape(props.is_a?(String) ? props : props.to_json)
end

#server_render_js(js_expression, options = {}) ⇒ Object

Helper method to take javascript expression and returns the output from evaluating it. If you have more than one line that needs to be executed, wrap it in an IIFE. JS exceptions are caught and console messages are handled properly. Options include:{ prerender:, trace:, raise_on_prerender_error:, throw_js_errors: }



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# File 'lib/react_on_rails/helper.rb', line 209

def server_render_js(js_expression, options = {})
  render_options = ReactOnRails::ReactComponent::RenderOptions
                   .new(react_component_name: "generic-js", options: options)

  js_code = <<-JS.strip_heredoc
  (function() {
    var htmlResult = '';
    var consoleReplayScript = '';
    var hasErrors = false;
    var renderingError = null;
    var renderingErrorObject = {};

    try {
      htmlResult =
        (function() {
          return #{js_expression};
        })();
    } catch(e) {
      renderingError = e;
      if (#{render_options.throw_js_errors}) {
        throw e;
      }
      htmlResult = ReactOnRails.handleError({e: e, name: null,
        jsCode: '#{escape_javascript(js_expression)}', serverSide: true});
      hasErrors = true;
      renderingErrorObject = {
        message: renderingError.message,
        stack: renderingError.stack,
      }
    }

    consoleReplayScript = ReactOnRails.getConsoleReplayScript();

    return JSON.stringify({
        html: htmlResult,
        consoleReplayScript: consoleReplayScript,
        hasErrors: hasErrors,
        renderingError: renderingErrorObject
    });

  })()
  JS

  result = ReactOnRails::ServerRenderingPool
           .server_render_js_with_console_logging(js_code, render_options)

  html = result["html"]
  console_script = result["consoleReplayScript"]
  console_script_tag = wrap_console_script_with_nonce(console_script) if render_options.replay_console
  raw("#{html}#{console_script_tag}")
rescue ExecJS::ProgramError => err
  raise ReactOnRails::PrerenderError.new(component_name: "N/A (server_render_js called)",
                                         err: err,
                                         js_code: js_code)
end

#server_rendered_react_component(render_options) ⇒ Object

Returns object with values that are NOT html_safe!



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# File 'lib/react_on_rails/helper.rb', line 606

def server_rendered_react_component(render_options)
  return { "html" => "", "consoleReplayScript" => "" } unless render_options.prerender

  react_component_name = render_options.react_component_name
  props = render_options.props

  # On server `location` option is added (`location = request.fullpath`)
  # React Router needs this to match the current route

  # Make sure that we use up-to-date bundle file used for server rendering, which is defined
  # by config file value for config.server_bundle_js_file
  ReactOnRails::ServerRenderingPool.reset_pool_if_server_bundle_was_modified

  # Since this code is not inserted on a web page, we don't need to escape props
  #
  # However, as JSON (returned from `props_string(props)`) isn't JavaScript,
  # but we want treat it as such, we need to compensate for the difference.
  #
  # \u2028 and \u2029 are valid characters in strings in JSON, but are treated
  # as newline separators in JavaScript. As no newlines are allowed in
  # strings in JavaScript, this causes an exception.
  #
  # We fix this by replacing these unicode characters with their escaped versions.
  # This should be safe, as the only place they can appear is in strings anyway.
  #
  # Read more here: http://timelessrepo.com/json-isnt-a-javascript-subset

  js_code = ReactOnRails::ServerRenderingJsCode.server_rendering_component_js_code(
    props_string: props_string(props).gsub("\u2028", '\u2028').gsub("\u2029", '\u2029'),
    rails_context: rails_context(server_side: true).to_json,
    redux_stores: initialize_redux_stores(render_options),
    react_component_name: react_component_name,
    render_options: render_options
  )

  begin
    result = ReactOnRails::ServerRenderingPool.server_render_js_with_console_logging(js_code, render_options)
  rescue StandardError => err
    # This error came from the renderer
    raise ReactOnRails::PrerenderError.new(component_name: react_component_name,
                                           # Sanitize as this might be browser logged
                                           props: sanitized_props_string(props),
                                           err: err,
                                           js_code: js_code)
  end

  if render_options.streaming?
    result.transform do |chunk_json_result|
      if should_raise_streaming_prerender_error?(chunk_json_result, render_options)
        raise_prerender_error(chunk_json_result, react_component_name, props, js_code)
      end
      # It doesn't make any transformation, it listens and raises error if a chunk has errors
      chunk_json_result
    end

    result.rescue do |err|
      # This error came from the renderer
      raise ReactOnRails::PrerenderError.new(component_name: react_component_name,
                                             # Sanitize as this might be browser logged
                                             props: sanitized_props_string(props),
                                             err: err,
                                             js_code: js_code)
    end
  elsif result["hasErrors"] && render_options.raise_on_prerender_error
    raise_prerender_error(result, react_component_name, props, js_code)
  end

  result
end

#should_raise_streaming_prerender_error?(chunk_json_result, render_options) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/react_on_rails/helper.rb', line 596

def should_raise_streaming_prerender_error?(chunk_json_result, render_options)
  chunk_json_result["hasErrors"] &&
    (if chunk_json_result["isShellReady"]
       render_options.raise_non_shell_server_rendering_errors
     else
       render_options.raise_on_prerender_error
     end)
end

#wrap_console_script_with_nonce(console_script_code) ⇒ Object

Wraps console replay JavaScript code in a script tag with CSP nonce if available. The console_script_code is already sanitized by scriptSanitizedVal() in the JavaScript layer, so using html_safe here is secure.



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# File 'lib/react_on_rails/helper.rb', line 486

def wrap_console_script_with_nonce(console_script_code)
  return "" if console_script_code.blank?

  # Get the CSP nonce if available (Rails 5.2+)
  # Rails 5.2-6.0 use content_security_policy_nonce with no arguments
  # Rails 6.1+ accept an optional directive argument
  nonce = if respond_to?(:content_security_policy_nonce)
            begin
              content_security_policy_nonce(:script)
            rescue ArgumentError
              # Fallback for Rails versions that don't accept arguments
              content_security_policy_nonce
            end
          end

  # Build the script tag with nonce if available
  script_options = { id: "consoleReplayLog" }
  script_options[:nonce] = nonce if nonce.present?

  # Safe to use html_safe because content is pre-sanitized via scriptSanitizedVal()
  content_tag(:script, console_script_code.html_safe, script_options)
end