+ return true;
+end
+
+function provider.users()
+ return accounts:users();
+end
+
+function provider.create_user(username, password)
+ if password == nil then
+ return accounts:set(username, {});
+ end
+ local salt = generate_uuid();
+ local valid, stored_key, server_key = getAuthenticationDatabaseSHA1(password, salt, default_iteration_count);
+ local stored_key_hex = to_hex(stored_key);
+ local server_key_hex = to_hex(server_key);
+ return accounts:set(username, {stored_key = stored_key_hex, server_key = server_key_hex, salt = salt, iteration_count = default_iteration_count});
+end
+
+function provider.delete_user(username)
+ return accounts:set(username, nil);
+end
+
+function provider.get_sasl_handler()
+ local testpass_authentication_profile = {
+ plain_test = function(sasl, username, password, realm)
+ return usermanager.test_password(username, realm, password), true;
+ end,
+ scram_sha_1 = function(sasl, username, realm)
+ local credentials = accounts:get(username);
+ if not credentials then return; end
+ if credentials.password then
+ usermanager.set_password(username, credentials.password, host);
+ credentials = accounts:get(username);
+ if not credentials then return; end
+ end
+
+ local stored_key, server_key, iteration_count, salt = credentials.stored_key, credentials.server_key, credentials.iteration_count, credentials.salt;
+ stored_key = stored_key and from_hex(stored_key);
+ server_key = server_key and from_hex(server_key);
+ return stored_key, server_key, iteration_count, salt, true;
+ end
+ };
+ return new_sasl(host, testpass_authentication_profile);