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