Remove most behaviour disparities between blocks and mutes (#7231)

* Remove most behaviour disparities between blocks and mutes

The only differences between block and mute should be:

- Mutes can optionally NOT affect notifications
- Mutes should not be visible to the muted

Fix #7230
Fix #5713

* Do not allow boosting someone you blocked

Fix #7248

* Do not allow favouriting someone you blocked

* Fix nil error in StatusPolicy

app/lib/feed_manager.rb

@@ -145,19 +145,20 @@ class FeedManager
     redis.exists("subscribed:#{timeline_id}")
   end
 
+  def blocks_or_mutes?(receiver_id, account_ids, context)
+    Block.where(account_id: receiver_id, target_account_id: account_ids).any? ||
+      (context == :home ? Mute.where(account_id: receiver_id, target_account_id: account_ids).any? : Mute.where(account_id: receiver_id, target_account_id: account_ids, hide_notifications: true).any?)
+  end
+
   def filter_from_home?(status, receiver_id)
     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?)
 
-    check_for_mutes = [status.account_id]
-    check_for_mutes.concat([status.reblog.account_id]) if status.reblog?
-
-    return true if Mute.where(account_id: receiver_id, target_account_id: check_for_mutes).any?
-
     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?
 
-    return true if Block.where(account_id: receiver_id, target_account_id: check_for_blocks).any?
+    return true if blocks_or_mutes?(receiver_id, check_for_blocks, :home)
 
     if status.reply? && !status.in_reply_to_account_id.nil?                                                                      # Filter out if it's a reply
       should_filter   = !Follow.where(account_id: receiver_id, target_account_id: status.in_reply_to_account_id).exists?         # and I'm not following the person it's a reply to
@@ -177,11 +178,13 @@ class FeedManager
   def filter_from_mentions?(status, receiver_id)
     return true if receiver_id == status.account_id
 
-    check_for_blocks = [status.account_id]
+    # This filter is called from NotifyService, but already after the sender of
-    check_for_blocks.concat(status.mentions.pluck(:account_id))
+    # the notification has been checked for mute/block. Therefore, it's not
+    # necessary to check the author of the toot for mute/block again
+    check_for_blocks = status.mentions.pluck(:account_id)
     check_for_blocks.concat([status.in_reply_to_account]) if status.reply? && !status.in_reply_to_account_id.nil?
 
-    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   = blocks_or_mutes?(receiver_id, check_for_blocks, :mentions)                                                         # Filter if it's from someone I blocked, in reply to someone I blocked, or mentioning someone I blocked (or muted)
     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

app/policies/status_policy.rb

@@ -16,7 +16,11 @@ class StatusPolicy < ApplicationPolicy
   end
 
   def reblog?
-    !direct? && (!private? || owned?) && show?
+    !direct? && (!private? || owned?) && show? && !current_account&.blocking?(author)
+  end
+
+  def favourite?
+    show? && !current_account&.blocking?(author)
   end
 
   def destroy?

app/services/favourite_service.rb

@@ -8,7 +8,7 @@ class FavouriteService < BaseService
   # @param [Status] status
   # @return [Favourite]
   def call(account, status)
-    authorize_with account, status, :show?
+    authorize_with account, status, :favourite?
 
     favourite = Favourite.find_by(account: account, status: status)