Envelope/mobile/lib/models/messages.dart

import 'dart:convert';
import 'package:pointycastle/export.dart';
import '/utils/encryption/crypto_utils.dart';
import '/utils/encryption/aes_helper.dart';
import '/utils/storage/database.dart';
import '/models/friends.dart';

const messageTypeSender = 'sender';
const messageTypeReceiver = 'receiver';

class Message {
  String id;
  String symmetricKey;
  String messageThreadKey;
  String data;
  String senderId;
  String senderUsername;
  String createdAt;
  Message({
    required this.id,
    required this.symmetricKey,
    required this.messageThreadKey,
    required this.data,
    required this.senderId,
    required this.senderUsername,
    required this.createdAt,
  });


  factory Message.fromJson(Map<String, dynamic> json, RSAPrivateKey privKey) {
    var symmetricKey = CryptoUtils.rsaDecrypt(
        base64.decode(json['symmetric_key']),
        privKey,
    );

    var data = AesHelper.aesDecrypt(
        symmetricKey,
        base64.decode(json['message_data']['data']),
    );

    var senderId = AesHelper.aesDecrypt(
        symmetricKey,
        base64.decode(json['message_data']['sender_id']),
    );

    return Message(
        id: json['id'],
        messageThreadKey: json['message_thread_key'],
        symmetricKey: base64.encode(symmetricKey),
        data: data,
        senderId: senderId,
        senderUsername: 'Unknown', // TODO
        createdAt: json['created_at'],
    );
  }

  @override
  String toString() {
    return '''


        id: $id
        data: $data
        senderId: $senderId
        senderUsername: $senderUsername
        createdAt: $createdAt
''';
  }

  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'message_thread_key': messageThreadKey,
      'symmetric_key': symmetricKey,
      'data': data,
      'sender_id': senderId,
      'sender_username': senderUsername,
      'created_at': createdAt,
    };
  }

}

Future<List<Message>> getMessagesForThread(String messageThreadKey) async {
  final db = await getDatabaseConnection();

  List<dynamic> whereArguments = [messageThreadKey];

  final List<Map<String, dynamic>> maps = await db.query(
      'messages',
      where: 'message_thread_key = ?',
      whereArgs: whereArguments,
      orderBy: 'created_at DESC',
  );

  return List.generate(maps.length, (i) {
    return Message(
        id: maps[i]['id'],
        messageThreadKey: maps[i]['message_thread_key'],
        symmetricKey: maps[i]['symmetric_key'],
        data: maps[i]['data'],
        senderId: maps[i]['sender_id'],
        senderUsername: maps[i]['sender_username'],
        createdAt: maps[i]['created_at'],
    );
  });

}