Add `tootctl domains purge` options to select subdomains and keep domain blocks (#22063)

* Add --include-subdomains option to tootctl domains purge

* Add support for '*.' subdomain wildcard patterns in `tootctl domains purge`

* Fix custom emojis deletion not following subdomain and URI options

* Change `tootctl domains purge` to not purge domain blocks unless --purge-domain-blocks is passed

* Refactor `tootctl domains purge`

* Add feedback on deleted domain blocks

lib/mastodon/domains_cli.rb

@@ -18,6 +18,8 @@ module Mastodon
     option :dry_run, type: :boolean
     option :limited_federation_mode, type: :boolean
     option :by_uri, type: :boolean
+    option :include_subdomains, type: :boolean
+    option :purge_domain_blocks, type: :boolean
     desc 'purge [DOMAIN...]', 'Remove accounts from a DOMAIN without a trace'
     long_desc <<-LONG_DESC
       Remove all accounts from a given DOMAIN without leaving behind any
@@ -33,40 +35,75 @@ module Mastodon
       that has the handle `foo@bar.com` but whose profile is at the URL
       `https://mastodon-bar.com/users/foo`, would be purged by either
       `tootctl domains purge bar.com` or `tootctl domains purge --by-uri mastodon-bar.com`.
+
+      When the --include-subdomains option is given, not only DOMAIN is deleted, but all
+      subdomains as well. Note that this may be considerably slower.
+
+      When the --purge-domain-blocks option is given, also purge matching domain blocks.
     LONG_DESC
     def purge(*domains)
       dry_run            = options[:dry_run] ? ' (DRY RUN)' : ''
+      domains            = domains.map { |domain| TagManager.instance.normalize_domain(domain) }
+      account_scope      = Account.none
+      domain_block_scope = DomainBlock.none
+      emoji_scope        = CustomEmoji.none
+
+      # Sanity check on command arguments
+      if options[:limited_federation_mode] && !domains.empty?
+        say('DOMAIN parameter not supported with --limited-federation-mode', :red)
+        exit(1)
+      elsif domains.empty? && !options[:limited_federation_mode]
+        say('No domain(s) given', :red)
+        exit(1)
+      end
 
-      scope = begin
+      # Build scopes from command arguments
       if options[:limited_federation_mode]
-          Account.remote.where.not(domain: DomainAllow.pluck(:domain))
-        elsif !domains.empty?
-          if options[:by_uri]
-            domains.map { |domain| Account.remote.where(Account.arel_table[:uri].matches("https://#{domain}/%", false, true)) }.reduce(:or)
+        account_scope = Account.remote.where.not(domain: DomainAllow.select(:domain))
+        emoji_scope   = CustomEmoji.remote.where.not(domain: DomainAllow.select(:domain))
       else
-            Account.remote.where(domain: domains)
+        # Handle wildcard subdomains
+        subdomain_patterns = domains.filter_map { |domain| "%.#{Account.sanitize_sql_like(domain[2..])}" if domain.start_with?('*.') }
+        domains = domains.filter { |domain| !domain.start_with?('*.') }
+        # Handle --include-subdomains
+        subdomain_patterns += domains.map { |domain| "%.#{Account.sanitize_sql_like(domain)}" } if options[:include_subdomains]
+        uri_patterns = (domains.map { |domain| Account.sanitize_sql_like(domain) } + subdomain_patterns).map { |pattern| "https://#{pattern}/%" }
+
+        if options[:purge_domain_blocks]
+          domain_block_scope = DomainBlock.where(domain: domains)
+          domain_block_scope = domain_block_scope.or(DomainBlock.where(DomainBlock.arel_table[:domain].matches_any(subdomain_patterns))) unless subdomain_patterns.empty?
         end
+
+        if options[:by_uri]
+          account_scope = Account.remote.where(Account.arel_table[:uri].matches_any(uri_patterns, false, true))
+          emoji_scope   = CustomEmoji.remote.where(CustomEmoji.arel_table[:uri].matches_any(uri_patterns, false, true))
         else
-          say('No domain(s) given', :red)
-          exit(1)
+          account_scope = Account.remote.where(domain: domains)
+          account_scope = account_scope.or(Account.remote.where(Account.arel_table[:domain].matches_any(subdomain_patterns))) unless subdomain_patterns.empty?
+          emoji_scope   = CustomEmoji.where(domain: domains)
+          emoji_scope   = emoji_scope.or(CustomEmoji.remote.where(CustomEmoji.arel_table[:uri].matches_any(subdomain_patterns))) unless subdomain_patterns.empty?
         end
       end
 
-      processed, = parallelize_with_progress(scope) do |account|
+      # Actually perform the deletions
+      processed, = parallelize_with_progress(account_scope) do |account|
         DeleteAccountService.new.call(account, reserve_username: false, skip_side_effects: true) unless options[:dry_run]
       end
 
-      DomainBlock.where(domain: domains).destroy_all unless options[:dry_run]
-
       say("Removed #{processed} accounts#{dry_run}", :green)
 
-      custom_emojis = CustomEmoji.where(domain: domains)
-      custom_emojis_count = custom_emojis.count
-      custom_emojis.destroy_all unless options[:dry_run]
+      if options[:purge_domain_blocks]
+        domain_block_count = domain_block_scope.count
+        domain_block_scope.in_batches.destroy_all unless options[:dry_run]
+        say("Removed #{domain_block_count} domain blocks#{dry_run}", :green)
+      end
+
+      custom_emojis_count = emoji_scope.count
+      emoji_scope.in_batches.destroy_all unless options[:dry_run]
 
       Instance.refresh unless options[:dry_run]
 
-      say("Removed #{custom_emojis_count} custom emojis", :green)
+      say("Removed #{custom_emojis_count} custom emojis#{dry_run}", :green)
     end
 
     option :concurrency, type: :numeric, default: 50, aliases: [:c]