Encrypted messaging app
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import 'dart:convert';
import 'dart:typed_data';
import 'package:Envelope/models/conversation_users.dart';
import 'package:Envelope/models/friends.dart';
import 'package:Envelope/models/my_profile.dart';
import 'package:pointycastle/export.dart';
import 'package:sqflite/sqflite.dart';
import 'package:uuid/uuid.dart';
import '/utils/encryption/crypto_utils.dart';
import '/utils/encryption/aes_helper.dart';
import '/utils/storage/database.dart';
import '/utils/strings.dart';
enum ConversationStatus {
complete,
pending,
error,
}
class Conversation {
String id;
String userId;
String conversationDetailId;
String symmetricKey;
bool admin;
String name;
ConversationStatus status;
Conversation({
required this.id,
required this.userId,
required this.conversationDetailId,
required this.symmetricKey,
required this.admin,
required this.name,
required this.status,
});
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 admin = AesHelper.aesDecrypt(
symmetricKeyDecrypted,
base64.decode(json['admin']),
);
return Conversation(
id: json['id'],
userId: json['user_id'],
conversationDetailId: detailId,
symmetricKey: base64.encode(symmetricKeyDecrypted),
admin: admin == 'true',
name: 'Unknown',
status: ConversationStatus.complete,
);
}
Future<Map<String, dynamic>> toJson() async {
MyProfile profile = await MyProfile.getProfile();
var symKey = base64.decode(symmetricKey);
List<ConversationUser> users = await getConversationUsers(this);
List<Object> userConversations = [];
for (var x in users) {
print(x.toMap());
}
for (ConversationUser user in users) {
if (profile.id == user.userId) {
userConversations.add({
'id': user.id,
'user_id': profile.id,
'conversation_detail_id': AesHelper.aesEncrypt(symKey, Uint8List.fromList(id.codeUnits)),
'admin': AesHelper.aesEncrypt(symKey, Uint8List.fromList((admin ? 'true' : 'false').codeUnits)),
'symmetric_key': base64.encode(CryptoUtils.rsaEncrypt(symKey, profile.publicKey!)),
});
continue;
}
Friend friend = await getFriendByFriendId(user.userId);
RSAPublicKey pubKey = CryptoUtils.rsaPublicKeyFromPem(friend.asymmetricPublicKey);
userConversations.add({
'id': user.id,
'user_id': friend.userId,
'conversation_detail_id': AesHelper.aesEncrypt(symKey, Uint8List.fromList(id.codeUnits)),
'admin': AesHelper.aesEncrypt(symKey, Uint8List.fromList((admin ? 'true' : 'false').codeUnits)),
'symmetric_key': base64.encode(CryptoUtils.rsaEncrypt(symKey, pubKey)),
});
}
for (var x in userConversations) {
print(x);
}
return {
'id': id,
'name': AesHelper.aesEncrypt(symKey, Uint8List.fromList(name.codeUnits)),
'users': AesHelper.aesEncrypt(symKey, Uint8List.fromList(jsonEncode(users).codeUnits)),
'user_conversations': userConversations,
};
}
@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,
'symmetric_key': symmetricKey,
'admin': admin ? 1 : 0,
'name': name,
'status': status.index,
};
}
}
Future<Conversation> createConversation(String title, List<Friend> friends) async {
final db = await getDatabaseConnection();
MyProfile profile = await MyProfile.getProfile();
var uuid = const Uuid();
final String conversationId = uuid.v4();
Uint8List symmetricKey = AesHelper.deriveKey(generateRandomString(32));
String associationKey = generateRandomString(32);
Conversation conversation = Conversation(
id: conversationId,
userId: profile.id,
conversationDetailId: '',
symmetricKey: base64.encode(symmetricKey),
admin: true,
name: title,
status: ConversationStatus.pending,
);
await db.insert(
'conversations',
conversation.toMap(),
conflictAlgorithm: ConflictAlgorithm.replace,
);
await db.insert(
'conversation_users',
ConversationUser(
id: uuid.v4(),
userId: profile.id,
conversationId: conversationId,
username: profile.username,
associationKey: associationKey,
admin: true,
).toMap(),
conflictAlgorithm: ConflictAlgorithm.replace,
);
for (Friend friend in friends) {
await db.insert(
'conversation_users',
ConversationUser(
id: uuid.v4(),
userId: friend.friendId,
conversationId: conversationId,
username: friend.username,
associationKey: associationKey,
admin: false,
).toMap(),
conflictAlgorithm: ConflictAlgorithm.replace,
);
}
return conversation;
}
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");
}
// 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'],
symmetricKey: maps[i]['symmetric_key'],
admin: maps[i]['admin'] == 1,
name: maps[i]['name'],
status: ConversationStatus.values[maps[i]['status']],
);
});
}
Future<Conversation> getConversationById(String id) async {
final db = await getDatabaseConnection();
final List<Map<String, dynamic>> maps = await db.query(
'conversations',
where: 'id = ?',
whereArgs: [id],
);
if (maps.length != 1) {
throw ArgumentError('Invalid user id');
}
return Conversation(
id: maps[0]['id'],
userId: maps[0]['user_id'],
conversationDetailId: maps[0]['conversation_detail_id'],
symmetricKey: maps[0]['symmetric_key'],
admin: maps[0]['admin'] == 1,
name: maps[0]['name'],
status: ConversationStatus.values[maps[0]['status']],
);
}