Implement posting messages in thread

lib/message_item_view.dart

@@ -1,18 +1,28 @@
+import 'package:enough_mail/enough_mail.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:wind/thread_model.dart';
 
 class MessageItemView extends StatelessWidget {
-  const MessageItemView({Key? key, required this.item, required this.isOpPost})
+  const MessageItemView(
+      {Key? key,
+      required this.item,
+      required this.isOpPost,
+      required this.isLast})
       : super(key: key);
 
   final MessageItem item;
   final bool isOpPost;
+  final bool isLast;
 
   @override
   Widget build(BuildContext context) {
     return Container(
-        margin: this.isOpPost ? EdgeInsets.only(bottom: 10) : EdgeInsets.all(0),
+        margin: this.isOpPost
+            ? EdgeInsets.only(bottom: 10, left: 10, right: 10, top: 16)
+            : isLast
+                ? EdgeInsets.only(left: 10, right: 10, bottom: 16)
+                : EdgeInsets.only(left: 10, right: 10),
         child: Card(
             elevation: 5,
             child: Column(
@@ -81,6 +91,8 @@ class MessageItem {
   final String date;
   final String body;
 
+  MimeMessage? originalMessage;
+
   MessageItem(
       this.id, this.number, this.subject, this.author, this.date, this.body);
 }

lib/nntp_client.dart

@@ -6,8 +6,8 @@ import 'package:tuple/tuple.dart';
 
 class NNTPClient {
   late WebSocketChannel _channel;
-  final Queue<_NNTPCommand> commandQueue = new Queue();
-  final List<String> tempBuffer = [];
+  final Queue<_NNTPCommand> _commandQueue = new Queue();
+  final List<String> _tempBuffer = [];
 
   String? currentGroup;
 
@@ -25,22 +25,22 @@ class NNTPClient {
       var respLines = resp.split("\r\n");
       if (respLines.last == "") respLines.removeLast(); // trailing empty line
 
-      if ((respLines.length > 1 || tempBuffer.isNotEmpty) &&
+      if ((respLines.length > 1 || _tempBuffer.isNotEmpty) &&
           respLines.last.codeUnits.last != ".".codeUnits.first) {
         // if it's multiline response and it doesn't contain dot in the end
         // then looks like we need to wait for next message to concatenate with current msg
-        tempBuffer.add(resp);
+        _tempBuffer.add(resp);
         return;
       }
 
-      if (tempBuffer.isNotEmpty) {
-        tempBuffer.add(resp);
-        resp = tempBuffer.join();
+      if (_tempBuffer.isNotEmpty) {
+        _tempBuffer.add(resp);
+        resp = _tempBuffer.join();
         respLines = resp.split("\r\n");
         respLines.removeLast(); // trailing empty line
-        tempBuffer.clear();
+        _tempBuffer.clear();
       }
-      var command = commandQueue.removeFirst();
+      var command = _commandQueue.removeFirst();
       var respCode = int.parse(respLines[0].split(" ")[0]);
       command.responseCompleter.complete(_CommandResponse(respCode, respLines));
     });
@@ -49,7 +49,7 @@ class NNTPClient {
   Future<_CommandResponse> _sendCommand(
       String command, List<String> args) async {
     var cmd = _NNTPCommand(_CommandRequest(command, args));
-    commandQueue.add(cmd);
+    _commandQueue.add(cmd);
     if (args.length > 0) {
       _channel.sink.add("$command ${args.join(" ")}\r\n");
     } else {
@@ -155,6 +155,18 @@ class NNTPClient {
 
     return threads;
   }
+
+  Future<int> postArticle(MimeMessage message) async {
+    var resp = await _sendCommand("POST", []);
+    if (resp.responseCode != 340) return resp.responseCode;
+    var rawMessage = message.renderMessage() + "\r\n.\r\n";
+
+    _channel.sink.add(rawMessage);
+    var cmd = _NNTPCommand(_CommandRequest("POST", []));
+    _commandQueue.add(cmd);
+    resp = await cmd.response;
+    return resp.responseCode;
+  }
 }
 
 class _NNTPCommand {

lib/thread_model.dart

@@ -1,3 +1,4 @@
+import 'package:enough_mail/enough_mail.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:wind/message_item_view.dart';
 import 'package:wind/nntp_client.dart';
@@ -9,13 +10,15 @@ class ThreadModel extends ChangeNotifier {
 
   Future<MessageItem> getPost(int number) async {
     var msg = await client!.getPost(number);
-    return MessageItem(
+    var mi = MessageItem(
         msg.getHeaderValue("Message-Id")!,
         number,
         msg.getHeaderValue("Subject")!,
         msg.getHeaderValue("From")!,
         msg.getHeaderValue("Date")!,
         msg.decodeTextPlainPart()!);
+    mi.originalMessage = msg;
+    return mi;
   }
 
   Future<List<MessageItem>> getThread(int threadNumber) async {
@@ -39,4 +42,15 @@ class ThreadModel extends ChangeNotifier {
 
     return items;
   }
+
+  Future<int> postMessage(MimeMessage opPost, String text) async {
+    var msg = MessageBuilder.buildSimpleTextMessage(
+        MailAddress.empty(), [], text,
+        subject: "Re: " + opPost.decodeSubject()!);
+    msg.setHeader("From", "anonymous");
+    msg.addHeader("In-Reply-To", opPost.getHeaderValue("Message-Id"));
+    msg.addHeader("References", opPost.getHeaderValue("Message-Id"));
+    msg.addHeader("Newsgroups", client!.currentGroup!);
+    return await client!.postArticle(msg);
+  }
 }

lib/thread_screen.dart

@@ -1,7 +1,7 @@
+import 'package:enough_mail/mime_message.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:wind/message_item_view.dart';
-import 'package:wind/nntp_client.dart';
 import 'package:wind/thread_list_view.dart';
 import 'package:wind/thread_model.dart';
 
@@ -22,21 +22,17 @@ class ThreadScreen extends StatefulWidget {
 
 class ThreadScreenState extends State<ThreadScreen> {
   ThreadScreenState(this.threadNumber);
-
-  late NNTPClient client;
   late int threadNumber;
 
   @override
   Widget build(BuildContext context) {
-    client = context.read<NNTPClient>();
-
     return Scaffold(
       appBar: AppBar(
         title: Text("Thread #${this.threadNumber}"),
       ),
       body: Center(
           child: Container(
-        width: 640,
+        width: 650,
         child: FutureBuilder<List<MessageItem>>(
           future: _fetch(context),
           builder: (context, snapshot) {
@@ -71,25 +67,34 @@ class ThreadScreenState extends State<ThreadScreen> {
         itemCount: data.length,
         itemBuilder: (context, index) {
           if (index == 1) {
-            return SendMessageForm();
+            return SendMessageForm(opPost: data[0].originalMessage!);
           }
-          return MessageItemView(item: data[index], isOpPost: index == 0);
+          return MessageItemView(
+              item: data[index],
+              isOpPost: index == 0,
+              isLast: index == data.length - 1);
         });
   }
 }
 
 class SendMessageForm extends StatefulWidget {
-  const SendMessageForm({Key? key}) : super(key: key);
+  const SendMessageForm({Key? key, required this.opPost}) : super(key: key);
+
+  final MimeMessage opPost;
 
   @override
   SendMessageFormState createState() {
-    return SendMessageFormState();
+    return SendMessageFormState(opPost);
   }
 }
 
 // Create a corresponding State class.
 // This class holds data related to the form.
 class SendMessageFormState extends State<SendMessageForm> {
+  SendMessageFormState(this.opPost);
+
+  final MimeMessage opPost;
+
   // Create a global key that uniquely identifies the Form widget
   // and allows validation of the form.
   //
@@ -102,6 +107,8 @@ class SendMessageFormState extends State<SendMessageForm> {
     // Build a Form widget using the _formKey created above.
     return Form(
       key: _formKey,
+      child: Container(
+        margin: EdgeInsets.only(left: 16, right: 16),
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
@@ -114,16 +121,18 @@ class SendMessageFormState extends State<SendMessageForm> {
                           keyboardType: TextInputType.multiline,
                           maxLines: null,
                           decoration: InputDecoration(
-                            border: OutlineInputBorder(), labelText: "Comment"),
+                              border: OutlineInputBorder(),
+                              labelText: "Комментарий"),
                           // The validator receives the text that the user has entered.
                           validator: (value) {
                             if (value == null || value.isEmpty) {
-                            return 'Please enter some text';
+                              return 'Пожалуйста, введите текст';
                             }
                             return null;
                           },
                         ))),
-              Padding(
+                Consumer<ThreadModel>(
+                  builder: (((context, value, child) => Padding(
                       padding: const EdgeInsets.symmetric(vertical: 16.0),
                       child: Row(
                           mainAxisAlignment: MainAxisAlignment.start,
@@ -132,21 +141,31 @@ class SendMessageFormState extends State<SendMessageForm> {
                               onPressed: () {
                                 // Validate returns true if the form is valid, or false otherwise.
                                 if (_formKey.currentState!.validate()) {
-                              // If the form is valid, display a snackbar. In the real world,
-                              // you'd often call a server or save the information in a database.
-                              ScaffoldMessenger.of(context).showSnackBar(
+                                  Provider.of<ThreadModel>(context,
+                                          listen: false)
+                                      .postMessage(opPost,
+                                          value.commentTextController.text)
+                                      .then((value) {
+                                    if (value == 240) {
+                                      ScaffoldMessenger.of(context)
+                                          .showSnackBar(
                                         const SnackBar(
-                                    content: Text('Processing Data')),
+                                            content: Text('Пост отправлен!')),
                                       );
                                     }
+                                  });
+                                  value.commentTextController.text = "";
+                                }
                               },
-                          child: const Text('Send'),
+                              child: const Text('Отправить'),
+                            )
+                          ])))),
                 )
-                      ]))
               ]),
             )
           ],
         ),
+      ),
     );
   }
 }