mirror of
https://github.com/discourse/discourse.git
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39e0442de9
- Client-side censoring fixed for non-chrome browsers. (Regular expression rewritten to avoid lookback) - Regex generation is now done on the server, to reduce repeated logic, and make it easier to extend in plugins - Censor tests are moved to ruby, to ensure everything works end-to-end - If "watched words regular expressions" is enabled, warn the admin when the generated regex is invalid
106 lines
2.7 KiB
Ruby
106 lines
2.7 KiB
Ruby
# frozen_string_literal: true
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class WordWatcher
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def initialize(raw)
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@raw = raw
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end
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def self.words_for_action(action)
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WatchedWord.where(action: WatchedWord.actions[action.to_sym]).limit(1000).pluck(:word)
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end
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def self.words_for_action_exists?(action)
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WatchedWord.where(action: WatchedWord.actions[action.to_sym]).exists?
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end
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def self.get_cached_words(action)
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Discourse.cache.fetch(word_matcher_regexp_key(action), expires_in: 1.day) do
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words_for_action(action).presence
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end
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end
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# This regexp is run in miniracer, and the client JS app
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# Make sure it is compatible with major browsers when changing
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# hint: non-chrome browsers do not support 'lookbehind'
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def self.word_matcher_regexp(action, raise_errors: false)
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words = get_cached_words(action)
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if words
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words = words.map do |w|
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word = word_to_regexp(w)
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word = "(#{word})" if SiteSetting.watched_words_regular_expressions?
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word
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end
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regexp = words.join('|')
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if !SiteSetting.watched_words_regular_expressions?
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regexp = "(#{regexp})"
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regexp = "(?:\\W|^)#{regexp}(?=\\W|$)"
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end
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Regexp.new(regexp, Regexp::IGNORECASE)
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end
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rescue RegexpError => e
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raise if raise_errors
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nil # Admin will be alerted via admin_dashboard_data.rb
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end
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def self.word_to_regexp(word)
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if SiteSetting.watched_words_regular_expressions?
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# Strip ruby regexp format if present, we're going to make the whole thing
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# case insensitive anyway
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return word.start_with?("(?-mix:") ? word[7..-2] : word
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end
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Regexp.escape(word).gsub("\\*", '\S*')
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end
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def self.word_matcher_regexp_key(action)
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"watched-words-list:#{action}"
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end
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def self.clear_cache!
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WatchedWord.actions.each do |a, i|
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Discourse.cache.delete word_matcher_regexp_key(a)
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end
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end
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def requires_approval?
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word_matches_for_action?(:require_approval)
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end
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def should_flag?
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word_matches_for_action?(:flag)
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end
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def should_block?
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word_matches_for_action?(:block, all_matches: true)
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end
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def word_matches_for_action?(action, all_matches: false)
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regexp = self.class.word_matcher_regexp(action)
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if regexp
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match = regexp.match(@raw)
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return match if !all_matches || !match
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if SiteSetting.watched_words_regular_expressions?
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set = Set.new
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@raw.scan(regexp).each do |m|
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if Array === m
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set.add(m.find(&:present?))
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elsif String === m
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set.add(m)
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end
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end
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matches = set.to_a
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else
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matches = @raw.scan(regexp)
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matches.flatten!
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matches.uniq!
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end
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matches.compact!
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matches.sort!
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matches
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else
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false
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end
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end
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end
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