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# frozen_string_literal: true
module Gitlab
# This class implements a simple rate limiter that can be used to throttle
# certain actions. Unlike Rack Attack and Rack::Throttle, which operate at
# the middleware level, this can be used at the controller or API level.
#
# @example
# if Gitlab::ApplicationRateLimiter.throttled?(:project_export, scope: [@project, @current_user])
# flash[:alert] = 'error!'
# redirect_to(edit_project_path(@project), status: :too_many_requests)
# end
class ApplicationRateLimiter
class << self
# Application rate limits
#
# Threshold value can be either an Integer or a Proc
# in order to not evaluate it's value every time this method is called
# and only do that when it's needed.
def rate_limits
{
issues_create: { threshold: -> { application_settings.issues_create_limit }, interval: 1.minute },
notes_create: { threshold: -> { application_settings.notes_create_limit }, interval: 1.minute },
project_export: { threshold: -> { application_settings.project_export_limit }, interval: 1.minute },
project_download_export: { threshold: -> { application_settings.project_download_export_limit }, interval: 1.minute },
project_repositories_archive: { threshold: 5, interval: 1.minute },
project_generate_new_export: { threshold: -> { application_settings.project_export_limit }, interval: 1.minute },
project_import: { threshold: -> { application_settings.project_import_limit }, interval: 1.minute },
project_testing_hook: { threshold: 5, interval: 1.minute },
play_pipeline_schedule: { threshold: 1, interval: 1.minute },
show_raw_controller: { threshold: -> { application_settings.raw_blob_request_limit }, interval: 1.minute },
group_export: { threshold: -> { application_settings.group_export_limit }, interval: 1.minute },
group_download_export: { threshold: -> { application_settings.group_download_export_limit }, interval: 1.minute },
group_import: { threshold: -> { application_settings.group_import_limit }, interval: 1.minute },
group_testing_hook: { threshold: 5, interval: 1.minute },
profile_add_new_email: { threshold: 5, interval: 1.minute },
profile_resend_email_confirmation: { threshold: 5, interval: 1.minute },
update_environment_canary_ingress: { threshold: 1, interval: 1.minute },
auto_rollback_deployment: { threshold: 1, interval: 3.minutes }
}.freeze
end
# Increments the given key and returns true if the action should
# be throttled.
#
# @param key [Symbol] Key attribute registered in `.rate_limits`
# @option scope [Array<ActiveRecord>] Array of ActiveRecord models to scope throttling to a specific request (e.g. per user per project)
# @option threshold [Integer] Optional threshold value to override default one registered in `.rate_limits`
# @option interval [Integer] Optional interval value to override default one registered in `.rate_limits`
# @option users_allowlist [Array<String>] Optional list of usernames to excepted from the limit. This param will only be functional if Scope includes a current user.
#
# @return [Boolean] Whether or not a request should be throttled
def throttled?(key, **options)
return unless rate_limits[key]
return if scoped_user_in_allowlist?(options)
threshold_value = options[:threshold] || threshold(key)
threshold_value > 0 &&
increment(key, options[:scope], options[:interval]) > threshold_value
end
# Increments the given cache key and increments the value by 1 with the
# expiration interval defined in `.rate_limits`.
#
# @param key [Symbol] Key attribute registered in `.rate_limits`
# @option scope [Array<ActiveRecord>] Array of ActiveRecord models to scope throttling to a specific request (e.g. per user per project)
# @option interval [Integer] Optional interval value to override default one registered in `.rate_limits`
#
# @return [Integer] incremented value
def increment(key, scope, interval = nil)
value = 0
interval_value = interval || interval(key)
Gitlab::Redis::Cache.with do |redis|
cache_key = action_key(key, scope)
value = redis.incr(cache_key)
redis.expire(cache_key, interval_value) if value == 1
end
value
end
# Logs request using provided logger
#
# @param request [Http::Request] - Web request to be logged
# @param type [Symbol] A symbol key that represents the request
# @param current_user [User] Current user of the request, it can be nil
# @param logger [Logger] Logger to log request to a specific log file. Defaults to Gitlab::AuthLogger
def log_request(request, type, current_user, logger = Gitlab::AuthLogger)
request_information = {
message: 'Application_Rate_Limiter_Request',
env: type,
remote_ip: request.ip,
request_method: request.request_method,
path: request.fullpath
}
if current_user
request_information.merge!({
user_id: current_user.id,
username: current_user.username
})
end
logger.error(request_information)
end
private
def threshold(key)
value = rate_limit_value_by_key(key, :threshold)
return value.call if value.is_a?(Proc)
value.to_i
end
def interval(key)
rate_limit_value_by_key(key, :interval).to_i
end
def rate_limit_value_by_key(key, setting)
action = rate_limits[key]
action[setting] if action
end
def action_key(key, scope)
composed_key = [key, scope].flatten.compact
serialized = composed_key.map do |obj|
if obj.is_a?(String) || obj.is_a?(Symbol)
"#{obj}"
else
"#{obj.class.model_name.to_s.underscore}:#{obj.id}"
end
end.join(":")
"application_rate_limiter:#{serialized}"
end
def application_settings
Gitlab::CurrentSettings.current_application_settings
end
def scoped_user_in_allowlist?(options)
return unless options[:users_allowlist].present?
scoped_user = [options[:scope]].flatten.find { |s| s.is_a?(User) }
return unless scoped_user
scoped_user.username.downcase.in?(options[:users_allowlist])
end
end
end
end
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