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322a3be2db
Constants should always be only assigned once. The logical OR assignment of a constant is a relic of the past before we used zeitwerk for autoloading and had bugs where a file could be loaded twice resulting in constant redefinition warnings.
112 lines
3.4 KiB
Ruby
112 lines
3.4 KiB
Ruby
# frozen_string_literal: true
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class RouteMatcher
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PATH_PARAMETERS = "_DISCOURSE_REQUEST_PATH_PARAMETERS"
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attr_reader :actions, :params, :methods, :aliases, :formats, :allowed_param_values
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def initialize(
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actions: nil,
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params: nil,
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methods: nil,
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formats: nil,
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aliases: nil,
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allowed_param_values: nil
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)
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@actions = Array(actions) if actions
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@params = Array(params) if params
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@methods = Array(methods) if methods
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@formats = Array(formats) if formats
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@aliases = aliases
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@allowed_param_values = allowed_param_values
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end
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# Return an identical route matcher, with the allowed_param_values replaced
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def with_allowed_param_values(new_allowed_param_values)
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RouteMatcher.new(
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actions: actions,
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params: params,
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methods: methods,
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formats: formats,
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aliases: aliases,
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allowed_param_values: new_allowed_param_values,
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)
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end
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def match?(env:)
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request = ActionDispatch::Request.new(env)
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action_allowed?(request) && params_allowed?(request) && method_allowed?(request) &&
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format_allowed?(request)
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end
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private
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def action_allowed?(request)
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return true if actions.nil? # actions are unrestricted
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# message_bus is not a rails route, special handling
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return true if actions.include?("message_bus") && request.fullpath =~ %r{\A/message-bus/.*/poll}
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# logster is not a rails route, special handling
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return true if actions.include?(Logster::Web) && request.fullpath =~ %r{\A/logs/.*\.json\z}
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path_params = path_params_from_request(request)
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actions.include? "#{path_params[:controller]}##{path_params[:action]}"
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end
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def params_allowed?(request)
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return true if params.nil? || allowed_param_values.blank? # params are unrestricted
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requested_params = request.parameters
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params.all? do |param|
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param_alias = aliases&.[](param)
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allowed_values = [allowed_param_values.fetch(param.to_s, [])].flatten
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value = requested_params[param.to_s]
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alias_value = requested_params[param_alias.to_s]
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return false if value.present? && alias_value.present?
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value = value || alias_value
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value = extract_category_id(value) if param_alias == :category_slug_path_with_id
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allowed_values.blank? || allowed_values.include?(value)
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end
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end
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def extract_category_id(category_slug_with_id)
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parts = category_slug_with_id.split("/")
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!parts.empty? && parts.last =~ /\A\d+\Z/ ? parts.pop : nil
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end
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def method_allowed?(request)
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return true if methods.nil?
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request_method = request.request_method&.downcase&.to_sym
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methods.include?(request_method)
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end
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def format_allowed?(request)
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return true if formats.nil?
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request_format = request.formats&.first&.symbol
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formats.include?(request_format)
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end
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def path_params_from_request(request)
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if request.env[ActionDispatch::Http::Parameters::PARAMETERS_KEY].nil?
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# We need to manually recognize the path when Rails hasn't done that yet. That can happen when
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# the matcher gets called in a Middleware before the controller did its work.
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# We store the result of `recognize_path` in a custom env key, so that we don't change
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# some Rails behavior by accident.
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request.env[PATH_PARAMETERS] ||= begin
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Rails.application.routes.recognize_path(request.path_info)
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rescue ActionController::RoutingError
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{}
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end
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end
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request.path_parameters.presence || request.env[PATH_PARAMETERS] || {}
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end
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end
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