fix(xep): Fix failure with multiple SCRAM negotiators and SASL2

integration_tests/create_users.sh

@@ -1,2 +1,4 @@
+set -ex
+
 prosodyctl --config ./prosody.cfg.lua register testuser1 localhost abc123
 prosodyctl --config ./prosody.cfg.lua register testuser2 localhost abc123

integration_tests/pubspec.yaml

@@ -3,14 +3,16 @@ description: A sample command-line application.
 version: 1.0.0
 
 environment:
-  sdk: '>=2.18.0 <3.0.0'
+  sdk: ">=3.0.0 <4.0.0"
 
 dependencies:
-  logging: ^1.0.2
-  moxxmpp: 0.3.0
-  moxxmpp_socket_tcp: 0.3.0
+  logging: ^1.3.0
+  moxxmpp:
+    path: ../packages/moxxmpp
+  moxxmpp_socket_tcp:
+    path: ../packages/moxxmpp_socket_tcp
 
 dev_dependencies:
-  lints: ^2.0.0
-  test: ^1.16.0
-  very_good_analysis: ^3.0.1
+  build_runner: ^2.4.13
+  test: ^1.25.8
+  very_good_analysis: ^6.0.0

integration_tests/test/sasl2_test.dart

@@ -4,6 +4,8 @@ import 'package:moxxmpp_socket_tcp/moxxmpp_socket_tcp.dart';
 import 'package:test/test.dart';
 
 class TestingTCPSocketWrapper extends TCPSocketWrapper {
+  TestingTCPSocketWrapper() : super(true);
+
   @override
   bool onBadCertificate(dynamic certificate, String domain) {
     return true;
@@ -27,7 +29,7 @@ void main() {
       ClientToServerNegotiator(),
       TestingTCPSocketWrapper(),
     )..connectionSettings = ConnectionSettings(
-        jid: JID.fromString('testuser@localhost'),
+        jid: JID.fromString('testuser1@localhost'),
         password: 'abc123',
         host: '127.0.0.1',
         port: 5222,
@@ -40,6 +42,8 @@ void main() {
     ]);
     await conn.registerFeatureNegotiators([
       SaslPlainNegotiator(),
+      SaslScramNegotiator(9, '', '', ScramHashType.sha1),
+      SaslScramNegotiator(10, '', '', ScramHashType.sha256),
       ResourceBindingNegotiator(),
       FASTSaslNegotiator(),
       Bind2Negotiator(),

packages/moxxmpp/lib/src/rfcs/rfc_6120/sasl/plain.dart

@@ -96,7 +96,9 @@ class SaslPlainNegotiator extends Sasl2AuthenticationNegotiator {
 
   @override
   Future<Result<bool, NegotiatorError>> onSasl2Success(XMLNode response) async {
-    state = NegotiatorState.done;
+    if (pickedForSasl2) {
+      state = NegotiatorState.done;
+    }
     return const Result(true);
   }
 

packages/moxxmpp/lib/src/rfcs/rfc_6120/sasl/scram.dart

@@ -363,6 +363,11 @@ class SaslScramNegotiator extends Sasl2AuthenticationNegotiator {
 
   @override
   Future<Result<bool, NegotiatorError>> onSasl2Success(XMLNode response) async {
+    // Don't do anything if we have not been picked for SASL2.
+    if (!pickedForSasl2) {
+      return const Result(true);
+    }
+
     // When we're done with SASL2, check the additional data to verify the server
     // signature.
     state = NegotiatorState.done;