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Diffstat (limited to 'app/models/glitch/keyword_mute.rb')
-rw-r--r-- | app/models/glitch/keyword_mute.rb | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/app/models/glitch/keyword_mute.rb b/app/models/glitch/keyword_mute.rb new file mode 100644 index 000000000..17ebc5b5e --- /dev/null +++ b/app/models/glitch/keyword_mute.rb @@ -0,0 +1,100 @@ +# 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) : /(?i:#{Regexp.escape(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 |