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135 lines
3.3 KiB
135 lines
3.3 KiB
import 'dart:convert';
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import 'dart:typed_data';
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import 'package:pointycastle/pointycastle.dart';
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import 'package:uuid/uuid.dart';
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import '/models/conversations.dart';
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import '/models/messages.dart';
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import '/utils/encryption/aes_helper.dart';
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import '/utils/encryption/crypto_utils.dart';
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import '/utils/strings.dart';
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class TextMessage extends Message {
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String text;
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TextMessage({
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id,
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symmetricKey,
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userSymmetricKey,
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senderId,
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senderUsername,
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associationKey,
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createdAt,
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failedToSend,
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required this.text,
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}) : super(
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id: id,
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symmetricKey: symmetricKey,
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userSymmetricKey: userSymmetricKey,
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senderId: senderId,
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senderUsername: senderUsername,
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associationKey: associationKey,
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createdAt: createdAt,
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failedToSend: failedToSend,
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);
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factory TextMessage.fromJson(Map<String, dynamic> json, RSAPrivateKey privKey) {
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var userSymmetricKey = CryptoUtils.rsaDecrypt(
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base64.decode(json['symmetric_key']),
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privKey,
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);
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var symmetricKey = AesHelper.aesDecrypt(
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userSymmetricKey,
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base64.decode(json['message_data']['symmetric_key']),
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);
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var senderId = AesHelper.aesDecrypt(
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base64.decode(symmetricKey),
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base64.decode(json['message_data']['sender_id']),
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);
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var data = AesHelper.aesDecrypt(
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base64.decode(symmetricKey),
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base64.decode(json['message_data']['data']),
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);
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return TextMessage(
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id: json['id'],
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symmetricKey: symmetricKey,
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userSymmetricKey: base64.encode(userSymmetricKey),
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senderId: senderId,
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senderUsername: 'Unknown',
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associationKey: json['association_key'],
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createdAt: json['created_at'],
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failedToSend: false,
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text: data,
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);
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}
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@override
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Map<String, dynamic> toMap() {
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return {
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'id': id,
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'symmetric_key': symmetricKey,
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'user_symmetric_key': userSymmetricKey,
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'data': text,
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'sender_id': senderId,
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'sender_username': senderUsername,
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'association_key': associationKey,
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'created_at': createdAt,
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'failed_to_send': failedToSend ? 1 : 0,
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};
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}
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Future<Map<String, dynamic>> payloadJson(Conversation conversation) async {
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final String messageDataId = (const Uuid()).v4();
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final symmetricKey = AesHelper.deriveKey(generateRandomString(32));
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final userSymmetricKey = AesHelper.deriveKey(generateRandomString(32));
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List<Map<String, String>> messages = await super.payloadJsonBase(
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symmetricKey,
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userSymmetricKey,
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conversation,
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id,
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messageDataId,
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);
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Map<String, String> messageData = {
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'id': messageDataId,
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'data': AesHelper.aesEncrypt(symmetricKey, Uint8List.fromList(text.codeUnits)),
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'sender_id': AesHelper.aesEncrypt(symmetricKey, Uint8List.fromList(senderId.codeUnits)),
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'symmetric_key': AesHelper.aesEncrypt(
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userSymmetricKey,
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Uint8List.fromList(base64.encode(symmetricKey).codeUnits),
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),
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};
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return <String, dynamic>{
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'message_data': messageData,
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'message': messages,
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};
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}
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@override
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String getContent() {
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return text;
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}
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@override
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String toString() {
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return '''
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id: $id
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data: $text,
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senderId: $senderId
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senderUsername: $senderUsername
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associationKey: $associationKey
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createdAt: $createdAt
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''';
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}
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}
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