feat: Make moxxmpp_socket Flutter independent

README.md

@@ -10,8 +10,8 @@ This package contains the actual XMPP code that is platform-independent.
 ### moxxmpp_socket
 
 `moxxmpp_socket` contains the implementation of the `BaseSocketWrapper` class that
-allows the user to resolve SRV records and thus support XEP-0368. Due to how DNS
-resolution is implemented, Flutter is required.
+implements the RFC6120 connection algorithm and XEP-0368 direct TLS connections,
+if a DNS implementation is given, and supports StartTLS.
 
 ## License
 

moxxmpp_socket/.flutter-plugins

@@ -1,4 +0,0 @@
-# This is a generated file; do not edit or check into version control.
-moxdns=/home/alexander/.pub-cache/hosted/git.polynom.me%47api%47packages%47Moxxy%47pub%47/moxdns-0.1.4/
-moxdns_android=/home/alexander/.pub-cache/hosted/git.polynom.me%47api%47packages%47Moxxy%47pub%47/moxdns_android-0.1.4/
-moxdns_linux=/home/alexander/.pub-cache/hosted/git.polynom.me%47api%47packages%47Moxxy%47pub%47/moxdns_linux-0.1.4/

moxxmpp_socket/.flutter-plugins-dependencies

@@ -1 +0,0 @@
-{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[],"android":[{"name":"moxdns_android","path":"/home/alexander/.pub-cache/hosted/git.polynom.me%47api%47packages%47Moxxy%47pub%47/moxdns_android-0.1.4/","native_build":true,"dependencies":[]}],"macos":[],"linux":[{"name":"moxdns_linux","path":"/home/alexander/.pub-cache/hosted/git.polynom.me%47api%47packages%47Moxxy%47pub%47/moxdns_linux-0.1.4/","native_build":true,"dependencies":[]}],"windows":[],"web":[]},"dependencyGraph":[{"name":"moxdns","dependencies":["moxdns_android","moxdns_linux"]},{"name":"moxdns_android","dependencies":["moxdns"]},{"name":"moxdns_linux","dependencies":["moxdns"]}],"date_created":"2022-11-08 14:21:52.966343","version":"3.3.3"}

moxxmpp_socket/README.md

@@ -1,6 +1,15 @@
 # moxxmpp_socket
 
-A socket for moxxmpp that does SRV resolution.
+A socket for moxxmpp that implements the connection algorithm as specified by
+[RFC6210](https://xmpp.org/rfcs/rfc6120.html) and [XEP-0368](https://xmpp.org/extensions/xep-0368.html),
+while also supporting StartTLS and direct TLS.
+
+In order to make this package independent of Flutter, I removed DNS SRV resolution from
+the package. The `TCPSocketWrapper` contains a method called `srvQuery` that can be
+overridden by the user. It takes the domain to query and a DNSSEC flag and is expected
+to return the list of SRV records, encoded by `MoxSrvRecord` objects. To perform the
+resolution, one can use any DNS library. A Flutter plugin implementing SRV resolution
+is, for example, [moxdns](https://codeberg.org/moxxy/moxdns).
 
 ## License
 

moxxmpp_socket/lib/src/record.dart

@@ -0,0 +1,8 @@
+/// A data class to represent a DNS SRV record.
+class MoxSrvRecord {
+  MoxSrvRecord(this.priority, this.weight, this.target, this.port);
+  final int priority;
+  final int weight;
+  final int port;
+  final String target;
+}

moxxmpp_socket/lib/src/rfc_2782.dart

@@ -1,7 +1,7 @@
-import 'package:moxdns/moxdns.dart';
+import 'package:moxxmpp_socket/src/record.dart';
 
 /// Sorts the SRV records according to priority and weight.
-int srvRecordSortComparator(SrvRecord a, SrvRecord b) {
+int srvRecordSortComparator(MoxSrvRecord a, MoxSrvRecord b) {
   if (a.priority < b.priority) {
     return -1;
   } else {

moxxmpp_socket/lib/src/socket.dart

@@ -2,8 +2,9 @@ import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'package:logging/logging.dart';
-import 'package:moxdns/moxdns.dart';
+import 'package:meta/meta.dart';
 import 'package:moxxmpp/moxxmpp.dart';
+import 'package:moxxmpp_socket/src/record.dart';
 import 'package:moxxmpp_socket/src/rfc_2782.dart';
 
 /// TCP socket implementation for XmppConnection
@@ -39,6 +40,16 @@ class TCPSocketWrapper extends BaseSocketWrapper {
     _socketSubscription?.cancel();
   }
 
+  /// Called on connect to perform a SRV query against [domain]. If [dnssec] is true,
+  /// then DNSSEC validation should be performed.
+  ///
+  /// Returns a list of SRV records. If none are available or an error occured, an empty
+  /// list is returned.
+  @visibleForOverriding
+  Future<List<MoxSrvRecord>> srvQuery(String domain, bool dnssec) async {
+    return <MoxSrvRecord>[];
+  }
+  
   bool _onBadCertificate(dynamic certificate, String domain) {
     _log.fine('Bad certificate: ${certificate.toString()}');
     //final isExpired = certificate.endValidity.isAfter(DateTime.now());
@@ -49,7 +60,7 @@ class TCPSocketWrapper extends BaseSocketWrapper {
   
   Future<bool> _xep368Connect(String domain) async {
     // TODO(Unknown): Maybe do DNSSEC one day
-    final results = await MoxdnsPlugin.srvQuery('_xmpps-client._tcp.$domain', false);
+    final results = await srvQuery('_xmpps-client._tcp.$domain', false);
     if (results.isEmpty) {
       return false;
     }
@@ -90,7 +101,7 @@ class TCPSocketWrapper extends BaseSocketWrapper {
   
   Future<bool> _rfc6120Connect(String domain) async {
     // TODO(Unknown): Maybe do DNSSEC one day
-    final results = await MoxdnsPlugin.srvQuery('_xmpp-client._tcp.$domain', false);
+    final results = await srvQuery('_xmpp-client._tcp.$domain', false);
     results.sort(srvRecordSortComparator);
 
     for (final srv in results) {

moxxmpp_socket/pubspec.yaml

@@ -1,18 +1,15 @@
 name: moxxmpp_socket
-description: A socket for moxxmpp that resolves SRV records
+description: A socket for moxxmpp that implements the RFC6120 connection algorithm
 version: 0.1.0
 homepage: https://codeberg.org/moxxy/moxxmpp
 publish_to: https://git.polynom.me/api/packages/Moxxy/pub
 
 environment:
   sdk: '>=2.18.0 <3.0.0'
-  flutter: '>=2.13.0-0.1'
 
 dependencies:
   logging: 1.0.2
-  moxdns:
-    hosted: https://git.polynom.me/api/packages/Moxxy/pub
-    version: 0.1.4
+  meta: ^1.6.0
   moxxmpp:
     hosted: https://git.polynom.me/api/packages/Moxxy/pub
     version: 0.1.0