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