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Limit the number of people that can be followed from one account (#8807)

Configurable soft limit of 7,500, and above that, configurable
ratio of 1.1 * followers, controlled by:

- MAX_FOLLOWS_THRESHOLD
- MAX_FOLLOWS_RATIO

Fix #2311
gh/stable
Eugen Rochko 2018-10-04 17:36:11 +02:00 committed by GitHub
parent 186024a058
commit a46ab86adf
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6 changed files with 47 additions and 1 deletions

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@ -25,6 +25,7 @@ class Follow < ApplicationRecord
has_one :notification, as: :activity, dependent: :destroy
validates :account_id, uniqueness: { scope: :target_account_id }
validates_with FollowLimitValidator, on: :create
scope :recent, -> { reorder(id: :desc) }

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@ -22,6 +22,7 @@ class FollowRequest < ApplicationRecord
has_one :notification, as: :activity, dependent: :destroy
validates :account_id, uniqueness: { scope: :target_account_id }
validates_with FollowLimitValidator, on: :create
def authorize!
account.follow!(target_account, reblogs: show_reblogs, uri: uri)

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@ -0,0 +1,27 @@
# frozen_string_literal: true
class FollowLimitValidator < ActiveModel::Validator
LIMIT = ENV.fetch('MAX_FOLLOWS_THRESHOLD', 7_500).to_i
RATIO = ENV.fetch('MAX_FOLLOWS_RATIO', 1.1).to_f
def validate(follow)
return if follow.account.nil? || !follow.account.local?
follow.errors.add(:base, I18n.t('users.follow_limit_reached', limit: self.class.limit_for_account(follow.account))) if limit_reached?(follow.account)
end
class << self
def limit_for_account(account)
if account.following_count < LIMIT
LIMIT
else
account.followers_count * RATIO
end
end
end
private
def limit_reached?(account)
account.following_count >= self.class.limit_for_account(account)
end
end

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@ -37,6 +37,8 @@ class ImportWorker
end
def import_rows
CSV.new(import_contents).reject(&:blank?)
rows = CSV.new(import_contents).reject(&:blank?)
rows = rows.take(FollowLimitValidator.limit_for_account(@import.account)) if @import.type == 'following'
rows
end
end

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@ -917,6 +917,7 @@ en:
tips: Tips
title: Welcome aboard, %{name}!
users:
follow_limit_reached: You cannot follow more than %{limit} people
invalid_email: The e-mail address is invalid
invalid_otp_token: Invalid two-factor code
otp_lost_help_html: If you lost access to both, you may get in touch with %{email}

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@ -23,6 +23,20 @@ RSpec.describe Follow, type: :model do
follow.valid?
expect(follow).to model_have_error_on_field(:target_account)
end
it 'is invalid if account already follows too many people' do
alice.update(following_count: FollowLimitValidator::LIMIT)
expect(subject).to_not be_valid
expect(subject).to model_have_error_on_field(:base)
end
it 'is valid if account is only on the brink of following too many people' do
alice.update(following_count: FollowLimitValidator::LIMIT - 1)
expect(subject).to be_valid
expect(subject).to_not model_have_error_on_field(:base)
end
end
describe 'recent' do