Module: RESTFramework::Utils

Defined in:
lib/rest_framework/utils.rb

Constant Summary collapse

HTTP_METHOD_ORDERING = 
%w(GET POST PUT PATCH DELETE)

Class Method Summary collapse

Class Method Details

.comparable_path(path) ⇒ Object

Helper to normalize a path pattern by replacing URL params with generic placeholder, and removing the ‘(.:format)` at the end.



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# File 'lib/rest_framework/utils.rb', line 47

def self.comparable_path(path)
  return path.gsub("(.:format)", "").gsub(/:[0-9A-Za-z_-]+/, ":x")
end

.get_request_route(application_routes, request) ⇒ Object

Helper to get the first route pattern which matches the given request.



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# File 'lib/rest_framework/utils.rb', line 41

def self.get_request_route(application_routes, request)
  application_routes.router.recognize(request) { |route, _| return route }
end

.get_routes(application_routes, request, current_route: nil) ⇒ Object

Helper for showing routes under a controller action; used for the browsable API.



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# File 'lib/rest_framework/utils.rb', line 52

def self.get_routes(application_routes, request, current_route: nil)
  current_route ||= self.get_request_route(application_routes, request)
  current_path = current_route.path.spec.to_s.gsub("(.:format)", "")
  current_levels = current_path.count("/")
  current_comparable_path = self.comparable_path(current_path)

  # Add helpful properties of the current route.
  path_args = current_route.required_parts.map { |n| request.path_parameters[n] }
  route_props = {
    with_path_args: ->(r) {
      r.format(r.required_parts.each_with_index.map { |p, i| [p, path_args[i]] }.to_h)
    },
  }

  # Return routes that match our current route subdomain/pattern, grouped by controller. We
  # precompute certain properties of the route for performance.
  return route_props, application_routes.routes.select { |r|
    # We `select` first to avoid unnecessarily calculating metadata for routes we don't even want
    # to show.
    (
      (r.defaults[:subdomain].blank? || r.defaults[:subdomain] == request.subdomain) &&
      self.comparable_path(r.path.spec.to_s).start_with?(current_comparable_path) &&
      r.defaults[:controller].present? &&
      r.defaults[:action].present?
    )
  }.map { |r|
    path = r.path.spec.to_s.gsub("(.:format)", "")
    levels = path.count("/")
    matches_path = current_path == path
    matches_params = r.required_parts.length == current_route.required_parts.length

    {
      route: r,
      verb: r.verb,
      path: path,
      # Starts at the number of levels in current path, and removes the `(.:format)` at the end.
      relative_path: path.split("/")[current_levels..]&.join("/"),
      controller: r.defaults[:controller].presence,
      action: r.defaults[:action].presence,
      matches_path: matches_path,
      matches_params: matches_params,
      # The following options are only used in subsequent processing in this method.
      _levels: levels,
    }
  }.sort_by { |r|
    # Sort by levels first, so the routes matching closely with current request show first, then
    # by the path, and finally by the HTTP verb.
    [r[:_levels], r[:_path], HTTP_METHOD_ORDERING.index(r[:verb]) || 99]
  }.group_by { |r| r[:controller] }.sort_by { |c, _r|
    # Sort the controller groups by current controller first, then depth, then alphanumerically.
    [request.params[:controller] == c ? 0 : 1, c.count("/"), c]
  }.to_h
end

.parse_extra_actions(extra_actions) ⇒ Object

Helper to take extra_actions hash and convert to a consistent format: ‘methods:, kwargs:`.



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# File 'lib/rest_framework/utils.rb', line 6

def self.parse_extra_actions(extra_actions)
  return (extra_actions || {}).map do |k, v|
    kwargs = {action: k}
    path = k

    # Convert structure to path/methods/kwargs.
    if v.is_a?(Hash)  # Allow kwargs to be used to define path differently from the key.
      v = v.symbolize_keys

      # Ensure methods is an array.
      if v[:methods].is_a?(String) || v[:methods].is_a?(Symbol)
        methods = [v.delete(:methods)]
      else
        methods = v.delete(:methods)
      end

      # Override path if it's provided.
      if v.key?(:path)
        path = v.delete(:path)
      end

      # Pass any further kwargs to the underlying Rails interface.
      kwargs = kwargs.merge(v)
    elsif v.is_a?(Symbol) || v.is_a?(String)
      methods = [v]
    else
      methods = v
    end

    # Return a hash with keys: :path, :methods, :kwargs.
    {path: path, methods: methods, kwargs: kwargs}
  end
end