Handmaded with ❤️ from scratch. 

Feature list:
- Own MTProto implementation. Works completely asynchronous with Web Workers and uses the fastest (rusha for sha1, forge for sha256) ever available hashing solutions: https://dominictarr.github.io/crypto-bench/
- Supports PFS. Updates the temporary auth key every two hours. Follows the security guidelines.
- All the scrollable content is rendered partially. You can scroll up a whole message history or the dialog list without loosing any performance.
- The dialog list and message history are animated. It uses FLIP technique for smooth content appearing, removing and shuffling.
- The gzipped JS bundle size, including the workers and the tl-schema, is 231kb. The whole app zip size is 308kb for content and 938kb for favicons.

Made as a part of the master degree diploma work for BMSTU IC8 Information Security.

You can use localStorage.setItem('debugmt', 1) in a browser developer console to view the MTProto connection logs.

Known Issues due to lack of time:
- By default, DC 2 is set. If you provide any non DC 2 phone number, the app will take some time to switch DC and create new keys pair.
- Message deleting and editing is not implemented yet.
- New dialogs won't show at the dialogs list.
- Short chat messages and short self messages updates are not implemented yet.
- The dialog and messages loaders are freezing.
- Sometimes there can be issues with temporary and permanent keys generation / binding. You can use client.svc.meta = {} and localStorage.uid = 0 to force an authorization data removal.

Приложение использует собственную реализацию протокола (transferred size: 270KB), высокая скорость работы приложения, а также соответствие дизайну предоставленных макетов в целом позволяют высоко оценить работу.

Конкурсное задание выполнено практически полностью, однако не завершена работа над загрузкой фото профиля при регистрации. Из реализации дополнительных бонусов, не отмеченных в задании, отметим поддержку некоторых типов медиа, прогрессы при загрузке, кеширование сообщений.

В процессе тестирования выявлены следующие недостатки: 

– Некоторые детали дизайна некорректны: в шапке открытого чата нет кнопок, в каналах сохраняется поле ввода, логотип канала отображается напротив сообщений, кнопка ‘Next’ появляется до введения валидного номера .
– Медленная загрузка чатов.

Недоработки экрана входа: 

– Префиксы некоторых стран содержат лишний символ, что в итоге приводит к невозможности входа (использование пункта 'Other' в выпадающем списке стран решает эту проблему);
– США как страна по умолчанию;
– Редактирование номера приводит к полному сбросу данных;
– На экране ввода кода нет автоматической проверки введёного кода и фильтрации поля ввода.

+ Great idea of tg logo display before page is ready.
+ Cool that country autocompletes not only by name, but by code too.
- It doesn't let you start the number with code, changing country by it. Can't edit code in number.

Probably winning solution

Very good implementation. If this is a diploma work, can I see your source code?

If put long value on check code input the monkey is dissapear. Also you can submit check code as soon as user input 5 symbols. No need next button.
Overall, good job!

Bug when changing the phone number after the input. Input place caret to the end for any modification

Hm...because of something, I can't get further than login screen even for my real number.

if i chose Other, i can't pass validation.

Login Page:
- when select country scroll appears on a moment
- no country images
- if you type name of country and press arrow key and press enter, there will be unexpected country (see video)
- hover on country in select isn't implemented
- it'd be better if after changing phone number, input won't be cleared
- input's caret should be blue when input is focused, and red when input is wrong (according to mockups)
- when phone number isn't completed 'Next' button shouldn't be visible (according to mockups)
- can't change phone code. It's important as many users don't use country select in real at all
- it'd a good to invoke help.getNearestDc and select country according to current user's location.
* I've faced with login failure (endless auth.sendCode performing) a couple of times (one of them see in video, console included only migration message)

Main Page:
- it seems some heavy operations are processed in main thread. Sometimes I have freezes when select a dialog (try to select consistently 5+ dialogs)
- all users are online
- message creation box shouldn't be visible in broadcast channels (like Telegram Contests)
- probably it'll be better user can't select dialog's title
- there aren't checks in my messages
- there aren't dates in photo messages
- dialog with myself should be called 'Saved Messages' (when it's selected)
- default scroll
* Nice images preload