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|
# frozen_string_literal: true
# == Schema Information
#
# Table name: glitch_keyword_mutes
#
# id :bigint(8) not null, primary key
# account_id :bigint(8) not null
# keyword :string not null
# whole_word :boolean default(TRUE), not null
# created_at :datetime not null
# updated_at :datetime not null
# apply_to_mentions :boolean default(TRUE), not null
#
class Glitch::KeywordMute < ApplicationRecord
belongs_to :account, required: true
validates_presence_of :keyword
after_commit :invalidate_cached_matchers
module Scopes
Unscoped = 0b00
HomeFeed = 0b01
Mentions = 0b10
end
def self.text_matcher_for(account_id)
TextMatcher.new(account_id)
end
def self.tag_matcher_for(account_id)
TagMatcher.new(account_id)
end
def scope
s = Scopes::Unscoped
s |= Scopes::HomeFeed
s |= Scopes::Mentions if apply_to_mentions?
s
end
private
def invalidate_cached_matchers
Rails.cache.delete(TextMatcher.cache_key(account_id))
Rails.cache.delete(TagMatcher.cache_key(account_id))
end
class CachedKeywordMute
attr_reader :keyword
attr_reader :whole_word
attr_reader :scope
def initialize(keyword, whole_word, scope)
@keyword = keyword
@whole_word = whole_word
@scope = scope
end
def boundary_regex_for_keyword
sb = keyword =~ /\A[[:word:]]/ ? '\b' : ''
eb = keyword =~ /[[:word:]]\Z/ ? '\b' : ''
/(?mix:#{sb}#{Regexp.escape(keyword)}#{eb})/
end
def matches?(str, required_scope)
((required_scope & scope) == required_scope) && \
str =~ (whole_word ? boundary_regex_for_keyword : /#{Regexp.escape(keyword)}/i)
end
end
class Matcher
attr_reader :account_id
attr_reader :keywords
def initialize(account_id)
@account_id = account_id
@keywords = Rails.cache.fetch(self.class.cache_key(account_id)) { fetch_keywords }
end
protected
def fetch_keywords
Glitch::KeywordMute.select(:whole_word, :keyword, :apply_to_mentions)
.where(account_id: account_id)
.map { |kw| CachedKeywordMute.new(transform_keyword(kw.keyword), kw.whole_word, kw.scope) }
end
def transform_keyword(keyword)
keyword
end
end
class TextMatcher < Matcher
def self.cache_key(account_id)
format('keyword_mutes:regex:text:%s', account_id)
end
def matches?(str, scope)
keywords.any? { |kw| kw.matches?(str, scope) }
end
end
class TagMatcher < Matcher
def self.cache_key(account_id)
format('keyword_mutes:regex:tag:%s', account_id)
end
def matches?(tags, scope)
tags.pluck(:name).any? do |n|
keywords.any? { |kw| kw.matches?(n, scope) }
end
end
protected
def transform_keyword(kw)
Tag::HASHTAG_RE =~ kw ? $1 : kw
end
end
end
|
