Merge branch 'master' into glitch-soc/tentative-merge

Conflicts:
	README.md
	app/controllers/statuses_controller.rb
	app/lib/feed_manager.rb
	config/navigation.rb
	spec/lib/feed_manager_spec.rb

Conflicts were resolved by taking both versions for each change.
This means the two filter systems (glitch-soc's keyword mutes and tootsuite's
custom filters) are in place, which will be changed in a follow-up commit.

app/lib/feed_manager.rb

@@ -154,10 +154,15 @@ 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_from_home?(status, receiver_id)
+    return true  if phrase_filtered?(status, receiver_id, :home)
 
     check_for_blocks = status.mentions.pluck(:account_id)
     check_for_blocks.concat([status.account_id])
-    check_for_blocks.concat([status.reblog.account_id]) if status.reblog?
+
+    if status.reblog?
+      check_for_blocks.concat([status.reblog.account_id])
+      check_for_blocks.concat(status.reblog.mentions.pluck(:account_id))
+    end
 
     return true if blocks_or_mutes?(receiver_id, check_for_blocks, :home)
 
@@ -198,6 +203,7 @@ class FeedManager
 
   def filter_from_mentions?(status, receiver_id)
     return true if receiver_id == status.account_id
+    return true if phrase_filtered?(status, receiver_id, :notifications)
 
     # This filter is called from NotifyService, but already after the sender of
     # the notification has been checked for mute/block. Therefore, it's not
@@ -212,6 +218,30 @@ class FeedManager
     should_filter
   end
 
+  def phrase_filtered?(status, receiver_id, context)
+    active_filters = Rails.cache.fetch("filters:#{receiver_id}") { CustomFilter.where(account_id: receiver_id).active_irreversible.to_a }.to_a
+
+    active_filters.select! { |filter| filter.context.include?(context.to_s) && !filter.expired? }
+    active_filters.map! do |filter|
+      if filter.whole_word
+        sb = filter.phrase =~ /\A[[:word:]]/ ? '\b' : ''
+        eb = filter.phrase =~ /[[:word:]]\Z/ ? '\b' : ''
+
+        /(?mix:#{sb}#{Regexp.escape(filter.phrase)}#{eb})/
+      else
+        /#{Regexp.escape(filter.phrase)}/i
+      end
+    end
+
+    return false if active_filters.empty?
+
+    combined_regex = active_filters.reduce { |memo, obj| Regexp.union(memo, obj) }
+    status         = status.reblog if status.reblog?
+
+    !combined_regex.match(Formatter.instance.plaintext(status)).nil? ||
+      (status.spoiler_text.present? && !combined_regex.match(status.spoiler_text).nil?)
+  end
+
   # Adds a status to an account's feed, returning true if a status was
   # added, and false if it was not added to the feed. Note that this is
   # an internal helper: callers must call trim or push updates if