Move nostr pubkeys to LDAP attribute

closes #173

app/services/ldap_manager/fetch_user_by_nostr_key.rb

@@ -0,0 +1,18 @@
+module LdapManager
+  class FetchUserByNostrKey < LdapManagerService
+    def initialize(pubkey:)
+      @ou = Setting.primary_domain
+      @pubkey = pubkey
+    end
+
+    def call
+      treebase   = "ou=#{@ou},cn=users,#{ldap_suffix}"
+      attributes = %w{ cn }
+      filter     = Net::LDAP::Filter.eq("nostrKey", @pubkey)
+
+      entry = client.search(base: treebase, filter: filter, attributes: attributes).first
+
+      User.find_by cn: entry.cn, ou: @ou  unless entry.nil?
+    end
+  end
+end

app/services/ldap_manager/update_nostr_key.rb

@@ -0,0 +1,16 @@
+module LdapManager
+  class UpdateNostrKey < LdapManagerService
+    def initialize(dn:, pubkey:)
+      @dn = dn
+      @pubkey = pubkey
+    end
+
+    def call
+      if @pubkey.present?
+        replace_attribute @dn, :nostrKey, @pubkey
+      else
+        delete_attribute @dn, :nostrKey
+      end
+    end
+  end
+end