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370 lines
9.4 KiB
370 lines
9.4 KiB
import 'dart:convert';
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import 'dart:typed_data';
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import 'package:Envelope/models/messages.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 '/models/conversation_users.dart';
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import '/models/friends.dart';
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import '/models/my_profile.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/storage/database.dart';
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import '/utils/strings.dart';
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Future<Conversation> createConversation(String title, List<Friend> friends, bool twoUser) 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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Conversation conversation = Conversation(
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id: conversationId,
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userId: profile.id,
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symmetricKey: base64.encode(symmetricKey),
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admin: true,
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name: title,
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twoUser: twoUser,
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status: ConversationStatus.pending,
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isRead: true,
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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: uuid.v4(),
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publicKey: profile.publicKey!,
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admin: true,
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).toMap(),
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conflictAlgorithm: ConflictAlgorithm.fail,
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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: uuid.v4(),
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publicKey: friend.publicKey,
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admin: twoUser ? true : 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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if (twoUser) {
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List<Map<String, dynamic>> maps = await db.query(
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'conversation_users',
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where: 'conversation_id = ? AND user_id != ?',
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whereArgs: [ conversation.id, profile.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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conversation.name = maps[0]['username'];
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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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}
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return conversation;
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}
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Future<Conversation> addUsersToConversation(Conversation conversation, List<Friend> friends) async {
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final db = await getDatabaseConnection();
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var uuid = const Uuid();
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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: conversation.id,
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username: friend.username,
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associationKey: uuid.v4(),
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publicKey: friend.publicKey,
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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.id == 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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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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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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twoUser: maps[0]['two_user'] == 1,
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status: ConversationStatus.values[maps[0]['status']],
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isRead: maps[0]['is_read'] == 1,
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);
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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(
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'conversations',
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orderBy: 'name',
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);
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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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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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twoUser: maps[i]['two_user'] == 1,
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status: ConversationStatus.values[maps[i]['status']],
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isRead: maps[i]['is_read'] == 1,
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);
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});
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}
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Future<Conversation?> getTwoUserConversation(String userId) async {
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final db = await getDatabaseConnection();
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MyProfile profile = await MyProfile.getProfile();
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final List<Map<String, dynamic>> maps = await db.rawQuery(
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'''
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SELECT conversations.* FROM conversations
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LEFT JOIN conversation_users ON conversation_users.conversation_id = conversations.id
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WHERE conversation_users.user_id = ?
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AND conversation_users.user_id != ?
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AND conversations.two_user = 1
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''',
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[ userId, profile.id ],
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);
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if (maps.length != 1) {
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return null;
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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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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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twoUser: maps[0]['two_user'] == 1,
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status: ConversationStatus.values[maps[0]['status']],
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isRead: maps[0]['is_read'] == 1,
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);
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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 symmetricKey;
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bool admin;
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String name;
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bool twoUser;
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ConversationStatus status;
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bool isRead;
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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.symmetricKey,
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required this.admin,
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required this.name,
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required this.twoUser,
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required this.status,
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required this.isRead,
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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 id = 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: id,
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userId: json['user_id'],
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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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twoUser: false,
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status: ConversationStatus.complete,
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isRead: true,
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);
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}
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Future<Map<String, dynamic>> payloadJson({ bool includeUsers = true }) async {
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MyProfile profile = await MyProfile.getProfile();
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var symKey = base64.decode(symmetricKey);
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if (!includeUsers) {
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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': await getEncryptedConversationUsers(this, symKey),
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};
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}
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List<ConversationUser> users = await getConversationUsers(this);
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List<Object> userConversations = [];
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for (ConversationUser user in users) {
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RSAPublicKey pubKey = profile.publicKey!;
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String newId = id;
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if (profile.id != user.userId) {
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Friend friend = await getFriendByFriendId(user.userId);
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pubKey = friend.publicKey;
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newId = (const Uuid()).v4();
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}
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userConversations.add({
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'id': newId,
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'user_id': user.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((user.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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return {
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'id': id,
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'name': AesHelper.aesEncrypt(symKey, Uint8List.fromList(name.codeUnits)),
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'users': await getEncryptedConversationUsers(this, symKey),
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'two_user': AesHelper.aesEncrypt(symKey, Uint8List.fromList((twoUser ? 'true' : 'false').codeUnits)),
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'user_conversations': userConversations,
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};
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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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'symmetric_key': symmetricKey,
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'admin': admin ? 1 : 0,
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'name': name,
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'two_user': twoUser ? 1 : 0,
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'status': status.index,
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'is_read': isRead ? 1 : 0,
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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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Future<Message?> getRecentMessage() async {
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final db = await getDatabaseConnection();
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final List<Map<String, dynamic>> maps = await db.rawQuery(
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'''
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SELECT * FROM messages WHERE association_key IN (
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SELECT association_key FROM conversation_users WHERE conversation_id = ?
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)
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ORDER BY created_at DESC
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LIMIT 1;
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''',
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[ id ],
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);
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if (maps.isEmpty) {
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return null;
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}
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return Message(
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id: maps[0]['id'],
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symmetricKey: maps[0]['symmetric_key'],
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userSymmetricKey: maps[0]['user_symmetric_key'],
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data: maps[0]['data'],
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senderId: maps[0]['sender_id'],
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senderUsername: maps[0]['sender_username'],
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associationKey: maps[0]['association_key'],
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createdAt: maps[0]['created_at'],
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failedToSend: maps[0]['failed_to_send'] == 1,
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);
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}
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}
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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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