37d495eeeb
This has a couple of advantages over the regex approach: - Keywords are individually addressable, which makes it easier to gather statistics (#363) - Keywords can be individually applied to different feeds, e.g. skipping mentions (#454) It *does* end up creating many more Regexp objects. I'm not yet sure if the difference is significant.
107 lines
2.4 KiB
Ruby
107 lines
2.4 KiB
Ruby
# 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 CachedKeywordMute
|
|
attr_reader :keyword
|
|
attr_reader :whole_word
|
|
|
|
def initialize(keyword, whole_word)
|
|
@keyword = keyword
|
|
@whole_word = whole_word
|
|
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)
|
|
str =~ (whole_word ? boundary_regex_for_keyword : /#{keyword}/i)
|
|
end
|
|
end
|
|
|
|
class Matcher
|
|
attr_reader :account_id
|
|
attr_reader :words
|
|
|
|
def initialize(account_id)
|
|
@account_id = account_id
|
|
@words = Rails.cache.fetch(self.class.cache_key(account_id)) { fetch_keywords }
|
|
end
|
|
|
|
protected
|
|
|
|
def fetch_keywords
|
|
Glitch::KeywordMute.where(account_id: account_id).pluck(:whole_word, :keyword).map do |whole_word, keyword|
|
|
CachedKeywordMute.new(transform_keyword(keyword), whole_word)
|
|
end
|
|
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)
|
|
words.any? { |w| w.matches?(str) }
|
|
end
|
|
end
|
|
|
|
class TagMatcher < Matcher
|
|
def self.cache_key(account_id)
|
|
format('keyword_mutes:regex:tag:%s', account_id)
|
|
end
|
|
|
|
def matches?(tags)
|
|
tags.pluck(:name).any? do |n|
|
|
words.any? { |w| w.matches?(n) }
|
|
end
|
|
end
|
|
|
|
protected
|
|
|
|
def transform_keyword(kw)
|
|
Tag::HASHTAG_RE =~ kw ? $1 : kw
|
|
end
|
|
end
|
|
end
|