Match keyword mute filter on hashtags. #208.

It is reasonable to expect someone to enter #foo to mute hashtag #foo.
However, tags are recorded on statuses without the preceding #.
To adjust for this, we build a separate tag matcher and use
Tag::HASHTAG_RE to extract a hashtag from the hashtag syntax.
This commit is contained in:
David Yip 2017-11-15 17:26:29 -06:00
parent 431503bae2
commit cb4ef24ac9
3 changed files with 69 additions and 32 deletions

View File

@ -141,7 +141,7 @@ class FeedManager
return false if receiver_id == status.account_id
return true if status.reply? && (status.in_reply_to_id.nil? || status.in_reply_to_account_id.nil?)
return true if keyword_filter?(status, Glitch::KeywordMute.matcher_for(receiver_id))
return true if keyword_filter?(status, receiver_id)
check_for_mutes = [status.account_id]
check_for_mutes.concat(status.mentions.pluck(:account_id))
@ -170,17 +170,20 @@ class FeedManager
false
end
def keyword_filter?(status, matcher)
should_filter = matcher =~ status.text
should_filter ||= matcher =~ status.spoiler_text
should_filter ||= status.tags.find_each.any? { |t| matcher =~ t.name }
def keyword_filter?(status, receiver_id)
text_matcher = Glitch::KeywordMute.text_matcher_for(receiver_id)
tag_matcher = Glitch::KeywordMute.tag_matcher_for(receiver_id)
should_filter = text_matcher =~ status.text
should_filter ||= text_matcher =~ status.spoiler_text
should_filter ||= tag_matcher =~ status.tags
if status.reblog?
reblog = status.reblog
should_filter ||= matcher =~ reblog.text
should_filter ||= matcher =~ reblog.spoiler_text
should_filter ||= reblog.tags.find_each.any? { |t| matcher =~ t.name }
should_filter ||= text_matcher =~ reblog.text
should_filter ||= text_matcher =~ reblog.spoiler_text
should_filter ||= tag_matcher =~ status.tags
end
!!should_filter
@ -195,7 +198,7 @@ class FeedManager
should_filter = Block.where(account_id: receiver_id, target_account_id: check_for_blocks).any? # Filter if it's from someone I blocked, in reply to someone I blocked, or mentioning someone I blocked
should_filter ||= (status.account.silenced? && !Follow.where(account_id: receiver_id, target_account_id: status.account_id).exists?) # of if the account is silenced and I'm not following them
should_filter ||= keyword_filter?(status, Glitch::KeywordMute.matcher_for(receiver_id)) # or if the mention contains a muted keyword
should_filter ||= keyword_filter?(status, receiver_id) # or if the mention contains a muted keyword
should_filter
end

View File

@ -16,44 +16,37 @@ class Glitch::KeywordMute < ApplicationRecord
validates_presence_of :keyword
after_commit :invalidate_cached_matcher
after_commit :invalidate_cached_matchers
def self.matcher_for(account_id)
Matcher.new(account_id)
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_matcher
Rails.cache.delete("keyword_mutes:regex:#{account_id}")
def invalidate_cached_matchers
Rails.cache.delete(TextMatcher.cache_key(account_id))
Rails.cache.delete(TagMatcher.cache_key(account_id))
end
class Matcher
class RegexpMatcher
attr_reader :account_id
attr_reader :regex
def initialize(account_id)
@account_id = account_id
regex_text = Rails.cache.fetch("keyword_mutes:regex:#{account_id}") { regex_text_for_account }
regex_text = Rails.cache.fetch(self.class.cache_key(account_id)) { make_regex_text }
@regex = /#{regex_text}/
end
def =~(str)
regex =~ str
end
private
protected
def keywords
Glitch::KeywordMute.where(account_id: account_id).select(:keyword, :id, :whole_word)
end
def regex_text_for_account
kws = keywords.find_each.with_object([]) do |kw, a|
a << (kw.whole_word ? boundary_regex_for_keyword(kw.keyword) : kw.keyword)
end
Regexp.union(kws).source
Glitch::KeywordMute.where(account_id: account_id).pluck(:whole_word, :keyword)
end
def boundary_regex_for_keyword(keyword)
@ -63,4 +56,45 @@ class Glitch::KeywordMute < ApplicationRecord
/(?mix:#{sb}#{Regexp.escape(keyword)}#{eb})/
end
end
class TextMatcher < RegexpMatcher
def self.cache_key(account_id)
format('keyword_mutes:regex:%s', account_id)
end
def =~(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:tag:%s', account_id)
end
def =~(tags)
tags.pluck(:name).detect { |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

View File

@ -4,8 +4,8 @@ RSpec.describe Glitch::KeywordMute, type: :model do
let(:alice) { Fabricate(:account, username: 'alice').tap(&:save!) }
let(:bob) { Fabricate(:account, username: 'bob').tap(&:save!) }
describe '.matcher_for' do
let(:matcher) { Glitch::KeywordMute.matcher_for(alice) }
describe '.text_matcher_for' do
let(:matcher) { Glitch::KeywordMute.text_matcher_for(alice.id) }
describe 'with no mutes' do
before do