Update LDAP mail attribute when re-confirming email

app/models/user.rb

@@ -58,13 +58,19 @@ class User < ApplicationRecord
   end
 
   def devise_after_confirmation
-    enable_service %w[ discourse gitea mediawiki xmpp ]
+    if ldap_entry[:mail] != self.email
+      # E-Mail update confirmed
+      LdapManager::UpdateEmail.call(self.dn, self.email)
+    else
+      # E-Mail from signup confirmed (i.e. account activation)
+      enable_service %w[ discourse gitea mediawiki xmpp ]
 
-    #TODO enable in development when we have easy setup of ejabberd etc.
-    return if Rails.env.development? || !Setting.ejabberd_enabled?
+      #TODO enable in development when we have easy setup of ejabberd etc.
+      return if Rails.env.development? || !Setting.ejabberd_enabled?
 
-    XmppExchangeContactsJob.perform_later(inviter, self) if inviter.present?
-    XmppSetDefaultBookmarksJob.perform_later(self)
+      XmppExchangeContactsJob.perform_later(inviter, self) if inviter.present?
+      XmppSetDefaultBookmarksJob.perform_later(self)
+    end
   end
 
   def send_devise_notification(notification, *args)

app/services/ldap_manager/update_email.rb

@@ -0,0 +1,12 @@
+module LdapManager
+  class UpdateEmail < LdapManagerService
+    def initialize(dn, address)
+      @dn = dn
+      @address = address
+    end
+
+    def call
+      replace_attribute @dn, :mail, [ @address ]
+    end
+  end
+end

app/services/ldap_manager_service.rb

@@ -0,0 +1,2 @@
+class LdapManagerService < LdapService
+end