Envelope/mobile/lib/models/conversations.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';


Conversation findConversationByDetailId(List<Conversation> conversations, String id) {
    for (var conversation in conversations) {
        if (conversation.conversationDetailId == id) {
            return conversation;
        }
    }
  // Or return `null`.
  throw ArgumentError.value(id, "id", "No element with that id");
}

class Conversation {
    String id;
    String userId;
    String conversationDetailId;
    String messageThreadKey;
    String symmetricKey;
    bool admin;
    String name;
    String? users;

    Conversation({
        required this.id,
        required this.userId,
        required this.conversationDetailId,
        required this.messageThreadKey,
        required this.symmetricKey,
        required this.admin,
        required this.name,
        this.users,
    });


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

        var detailId = AesHelper.aesDecrypt(
                symmetricKeyDecrypted,
                base64.decode(json['conversation_detail_id']),
        );

        var threadKey = AesHelper.aesDecrypt(
                symmetricKeyDecrypted,
                base64.decode(json['message_thread_key']),
        );

        var admin = AesHelper.aesDecrypt(
                symmetricKeyDecrypted,
                base64.decode(json['admin']),
        );

        return Conversation(
                id: json['id'],
                userId: json['user_id'],
                conversationDetailId: detailId,
                messageThreadKey: threadKey,
                symmetricKey: base64.encode(symmetricKeyDecrypted),
                admin: admin == 'true',
                name: 'Unknown',
        );
    }

    @override
    String toString() {
        return '''


id: $id
userId: $userId
name: $name
admin: $admin''';
    }

    Map<String, dynamic> toMap() {
        return {
            'id': id,
            'user_id': userId,
            'conversation_detail_id': conversationDetailId,
            'message_thread_key': messageThreadKey,
            'symmetric_key': symmetricKey,
            'admin': admin ? 1 : 0,
            'name': name,
            'users': users,
        };
    }
}


// A method that retrieves all the dogs from the dogs table.
Future<List<Conversation>> getConversations() async {
    final db = await getDatabaseConnection();

    final List<Map<String, dynamic>> maps = await db.query('conversations');

    return List.generate(maps.length, (i) {
        return Conversation(
                id: maps[i]['id'],
                userId: maps[i]['user_id'],
                conversationDetailId: maps[i]['conversation_detail_id'],
                messageThreadKey: maps[i]['message_thread_key'],
                symmetricKey: maps[i]['symmetric_key'],
                admin: maps[i]['admin'] == 1,
                name: maps[i]['name'],
                users: maps[i]['users'],
        );
    });
}