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# frozen_string_literal: true
# == Schema Information
#
# Table name: glitch_keyword_mutes
#
# id :integer not null, primary key
# account_id :integer not null
# keyword :string not null
# whole_word :boolean default(TRUE), not null
# created_at :datetime not null
# updated_at :datetime not null
#
class Glitch::KeywordMute < ApplicationRecord
belongs_to :account, required: true
validates_presence_of :keyword
after_commit :invalidate_cached_matchers
def self.text_matcher_for(account_id)
TextMatcher.new(account_id)
end
def self.tag_matcher_for(account_id)
TagMatcher.new(account_id)
end
private
def invalidate_cached_matchers
Rails.cache.delete(TextMatcher.cache_key(account_id))
Rails.cache.delete(TagMatcher.cache_key(account_id))
end
class RegexpMatcher
attr_reader :account_id
attr_reader :regex
def initialize(account_id)
@account_id = account_id
regex_text = Rails.cache.fetch(self.class.cache_key(account_id)) { make_regex_text }
@regex = /#{regex_text}/
end
protected
def keywords
Glitch::KeywordMute.where(account_id: account_id).pluck(:whole_word, :keyword)
end
def boundary_regex_for_keyword(keyword)
sb = keyword =~ /\A[[:word:]]/ ? '\b' : ''
eb = keyword =~ /[[:word:]]\Z/ ? '\b' : ''
/(?mix:#{sb}#{Regexp.escape(keyword)}#{eb})/
end
end
class TextMatcher < RegexpMatcher
def self.cache_key(account_id)
format('keyword_mutes:regex:text:%s', account_id)
end
def matches?(str)
!!(regex =~ str)
end
private
def make_regex_text
kws = keywords.map! do |whole_word, keyword|
whole_word ? boundary_regex_for_keyword(keyword) : keyword
end
Regexp.union(kws).source
end
end
class TagMatcher < RegexpMatcher
def self.cache_key(account_id)
format('keyword_mutes:regex:tag:%s', account_id)
end
def matches?(tags)
tags.pluck(:name).any? { |n| regex =~ n }
end
private
def make_regex_text
kws = keywords.map! do |whole_word, keyword|
term = (Tag::HASHTAG_RE =~ keyword) ? $1 : keyword
whole_word ? boundary_regex_for_keyword(term) : term
end
Regexp.union(kws).source
end
end
end
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