Fix account aliases page (#13452)

* Fix error not being displayed when adding an account alias, add error for self-references

Co-Authored-By: Mélanie Chauvel (ariasuni) <perso@hack-libre.org>

* Add “You have no aliases.” note in confusing empty aliases table

Co-Authored-By: Mélanie Chauvel (ariasuni) <perso@hack-libre.org>

Co-authored-by: Mélanie Chauvel (ariasuni) <perso@hack-libre.org>

app/models/account_alias.rb

@@ -18,6 +18,7 @@ class AccountAlias < ApplicationRecord
   validates :acct, presence: true, domain: { acct: true }
   validates :uri, presence: true
   validates :uri, uniqueness: { scope: :account_id }
+  validate :validate_target_account
 
   before_validation :set_uri
   after_create :add_to_account
@@ -44,4 +45,12 @@ class AccountAlias < ApplicationRecord
   def remove_from_account
     account.update(also_known_as: account.also_known_as.reject { |x| x == uri })
   end
+
+  def validate_target_account
+    if uri.nil?
+      errors.add(:acct, I18n.t('migrations.errors.not_found'))
+    elsif ActivityPub::TagManager.instance.uri_for(account) == uri
+      errors.add(:acct, I18n.t('migrations.errors.move_to_self'))
+    end
+  end
 end

app/views/settings/aliases/index.html.haml

@@ -23,7 +23,11 @@
         %th= t('simple_form.labels.account_alias.acct')
         %th
     %tbody
-      - @aliases.each do |account_alias|
+      - if @aliases.empty?
         %tr
-          %td= account_alias.acct
+          %td.muted-hint{ colspan: 2 }= t('aliases.empty')
-          %td= table_link_to 'trash', t('aliases.remove'), settings_alias_path(account_alias), data: { method: :delete }
+      - else
+        - @aliases.each do |account_alias|
+          %tr
+            %td= account_alias.acct
+            %td= table_link_to 'trash', t('aliases.remove'), settings_alias_path(account_alias), data: { method: :delete }

config/locales/en.yml

@@ -635,6 +635,7 @@ en:
     add_new: Create alias
     created_msg: Successfully created a new alias. You can now initiate the move from the old account.
     deleted_msg: Successfully remove the alias. Moving from that account to this one will no longer be possible.
+    empty: You have no aliases.
     hint_html: If you want to move from another account to this one, here you can create an alias, which is required before you can proceed with moving followers from the old account to this one. This action by itself is <strong>harmless and reversible</strong>. <strong>The account migration is initiated from the old account</strong>.
     remove: Unlink alias
   appearance: