HACKLYMPICS

OnlineJudge Keylogging ScreenRecording REST Java8 Python3 Django1.8 Material UI

What's This

• This was my undergrad project while I was a cadet at National Defense University (Jun. 2015 ~ Jun. 2018)
• I left the R.O.C. army in Jun. 2018 due to my disappointment in them.
• I transferred to University of Taipei in Aug. 2018, and got admitted to NCTU in Nov. 2019
• This is my complete rewrite of its predecessor which was written by six of my seniors
• A programming exam platform with online judge and anticheat
• Can prevent students from cheating (using StackOverflow, LINE, etc) with keylogging and continuous screen capture

Overview

• Three-tier REST architecture

  • Hacklympics - Client (Java FX)
  • HacklympicsAPI - RESTful API (Java 8)
  • Nocturnal - Backend (Python 3.5 + Django 1.8.18)

• Event-driven Architecture

  When there's a change in state at the server side, the server will notify all relevant clients by "dispatching events" to them. When a client receives an event from the server, it will take appropriate actions in order to reflect the changes to the user.

  • server-side event dispatcher: dispatcher.py
  • client-side event manager: EventManager.java

• Design Patterns used

  • Singleton
  • Observer

• Libraries used

  • okhttp - HTTP+HTTP/2 client for Android and Java applications.
  • gson - JSON Library. Used for passing data between Django and HacklympicsAPI
  • java-diff-utils - Diff Patch Library. Used for syncing keylogs.
  • thumbnailator - Thumbnail generation library. Used for down-scaling snapshots.
  • JFoenix - JavaFX Material Design Library
  • FontawesomeFX - Icon Library
  • RichTextFX - RichText Area for JavaFX. Used for code areas
  • TerminalFX - A Terminal Emulator written in JavaFX 8

Features

• Users with Teacher's privileges can create/edit/remove Courses/Exams/Problems.
  • each Course contains Exam(s)
  • each Exam contains Problem(s)
• Server-side Online Judge (implemented in judge.py)
  • Automatic score assiging (not implemented yet)
• Server-side countdown timer for each Exam (implemented in session.py.
  • when the time's up, the exam will halt automatically.
• Screen recording and keylogging targeting students while they are in exams
  • no more visiting StackOverflow! Everything is under surveillence!
  • taking snapshots
  • syncing keystrokes via diff-patches.
• Each exam has its own chatroom
  • all messages are public
  • useful for students asking teachers questions
  • togglable toast notifications (not implemented yet)

Supported Programming Languages

• Currently only Java is supported since this project mainly focuses on the proctoring mechanisms.

Usage

1. Clone this repo

$ git clone https://github.com/aesophor/hacklympics
$ cd hacklympics

2. Start the django server on 0.0.0.0:8000

$ cd Nocturnal && ./start_server.sh

3. Open another terminal, cd to hacklympics directory, and run the desktop client.

$ cd Hacklympics/dist
$ java -jar Hacklympics.jar

Note: Please edit Hacklympics/dist/config.properties to change where the desktop client will connect to.

Gallery

Please visit imgur for more screenshots.

Editing a Course


Student screens in real time


Syncing keylogs & playback


Full-fledged code editor for students


Passing an exam with Online Judge

License

Available under Mozilla Public License 2.0.