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codeOJ-Code Online Judge
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‎README.md

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#Code Online Judge (CodeOJ)
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CodeOJ is a judge system used to test correctness and efficiency of programs written for various programming languages in coding contests,Recruiters can conduct Hiring Challenges and for intra-inter college coding competitions.
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CodeOJ aims to build an environment for the people, specifically students,around the world to interact, practice and improve their programming skills.
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##Core Technologies Used
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Why Choose Java : Java makes the Application platform Independent .“Write Once, Run Anywhere”
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- Java for Standard Edition (J2SE)
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- Java for Enterprise Edition (J2EE)
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- Object Relational Mapping (ORM) using Hibernate Framework 3 by JBOSS : Hibernate makes the Judge Database Independent
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- Java Beans
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- Java Mail,JSTL,JUNIT for Unit Testing
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- Python for Judge Script
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- Twitter Bootstrap,Ajax,jQuery,JSON,CSS,HTML (Frontend)
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- Database : Mysql
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- Sandboxing : chroot(jail)
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##Features
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- Automatic Judging
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- Web Interface for Portability and simplicity
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+ Beginners Corner : Contains problems for beginners
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+ Practice Corner : Contains problems of previous contests
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+ Live Programming Contests (Past contest,Current and Upcoming)
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+ Admin Panel : to set the contests & problems & Rate the User
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- Designed keeping security in mind
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- All code run in private mode
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- Judge and project run inside chroot (in linux)
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- Has been used for live contest
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##Sandboxing : to prevent hackers to shutdown your server
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you can configure chroot(jail) on your system read chroot.txt (if interested)
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- code is frequently buggy and potentially malicious.
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- Code must run in a restricted environment (sandbox) to prevent it from damaging the system.
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- Resources (particularly, CPU time and memory) must be restricted.
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- Programs must be limited to a single thread.
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Programs must not be permitted to spawn other processes.
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- Programs must not be permitted to initiate system calls.
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- Programs must not be able to communicate through TCP/IP Sockets.
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##Pre-requisites and Configuration
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- Download and install Netbeans 7.1 : Quickly and easily develop desktop, mobile and web applications
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with Java, JavaScript, HTML5, PHP, C/C++ and more.NetBeans IDE is FREE, open source, and has a worldwide community of users and developers.
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+ Select Platform Linux x64 & all section
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+ https://netbeans.org/downloads/
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+In terminal,navigate to download directory & run
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```
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sh netbeans-8.1-linux.sh
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```
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+ select tomcat server instead of glassfish during installation
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- Update your system : Ubuntu Source list generator: https://repogen.simplylinux.ch/generate.php
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```
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sudo apt-get update
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sudo apt-get upgrade
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```
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- Install MySQL
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```
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sudo apt-get install mysql-server
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```
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+ Start/Stop Mysql server
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```
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sudo service mysql start
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sudo service mysql stop
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```
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+ To log in to MySQL as the root user:
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```
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mysql -u root -p
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```
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+ Create a New MySQL User and Database
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```
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create database testdb;
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create user 'testuser'@'localhost' identified by 'password';
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grant all on testdb.* to 'testuser';
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```
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- Install phpmyadmin : phpMyAdmin is a web application that provides a GUI to aid in MySQL database administration
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+ Step 1: Install Apache2, PHP and MySQL. We assume you already have installed LAMP on your system.
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- Install Apache
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```
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sudo apt-get install apache2
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sudo service apache2 restart
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```
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- Install PHP
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```
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sudo apt-get install php5
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```
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-If you need MySQL support also install php5-mysql
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```
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sudo apt-get install php5-mysql
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```
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+ Step 2: Install phpMyAdmin.
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```
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sudo apt-get install phpmyadmin
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```
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- After the installation has completed, add phpmyadmin to the apache configuration.
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```
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sudo vi /etc/apache2/apache2.conf
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```
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- Add the phpmyadmin config to the file.
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```
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Include /etc/phpmyadmin/apache.conf
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```
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- Restart apache:
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```
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sudo service apache2 restart
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```
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#Configuration
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- Download the repository in Extract to NetBeansProjects folder of your home directory
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- Open Netbeans and import project
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- Change path in src/java/connection/Path.java
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```
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static String path = "/home/<YOUR_PC_USERNAME>/NetBeansProjects/codeoj/web";
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```
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-Give permission to codeoj folder for creating directories & codefiles
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```
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chmod -R 777 codeoj
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```
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##Install packages
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```
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sudo apt-get install python-psutil
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sudo apt-get install python-mysqldb
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```
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- Install the compilers of programming languages you need on your system with sudo apt-get
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- Languages : Java, C, C++, Pascal,PHP, Perl, Ruby and Python,Haskell,Pike etc.
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##Database
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- Goto http://localhost/phpmyadmin
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- Create database named "code_online_judge"
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- Change user and pass in src/java/connection/Config.java
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```
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String url = "jdbc:mysql://localhost:3306/code_online_judge";
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String user = "<YOUR_MYSQL_USER>";
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String pass = "<YOUR_MYSQL_PASSWORD>";
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```
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- Open judge.py in web folder & change line 72 and line 316 with your database username and password
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```
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db = MySQLdb.connect("localhost","db_user","db_pass","code_online_judge")
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```
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##To Run :
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- Right click on Project codeoj & select deploy to run the project
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- No need to import the database as hibernate framework will take care of it.
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- Add username & password(md5) in Admin Table for admin panel access
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```
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goto http://localhost/codeoj/ap/adminpanel.jsp
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```
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- Add Entry with integer 1 in id Table for unique codefilename generator
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- Goto admin panel to set a contest:
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+ Contest Code(without spaces)
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+ Contest Name
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+ Contest Timing,Poster,no. of problems and instructions for contest
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- Set problems :
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+ problem code (should be in format CONTESTCODE<s.no>) e.g TEST1,TEST2 (if contest name is TEST)
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+ Problems name,setter,tester,timelimit(should be integer in seconds)
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+ Problems Description and Number of TEST FILES(should be in format in<s.no>.txt and out<s.no>.txt) e.g in1.txt,in2.txt,out1.txt,out2.txt
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- During Contest User should register for contest on:
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```
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http://localhost/codeoj/index.jsp
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```
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+ User can View problems,Comment on problems,View his submissions and LeaderBoard
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+ To Submit, select language and paste your code in the editor itself or browse the codefile & Judge will return the verdict in a while.
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- After Contest Ends :
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+ Make solutions public by clicking on "Make public" tab
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+ Update the Ratings of the Users participated in contest (ELO Algorithm is used to calculate Ratings)
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‎build.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<!-- You may freely edit this file. See commented blocks below for -->
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<!-- some examples of how to customize the build. -->
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<!-- (If you delete it and reopen the project it will be recreated.) -->
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<!-- By default, only the Clean and Build commands use this build script. -->
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<!-- Commands such as Run, Debug, and Test only use this build script if -->
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<!-- the Compile on Save feature is turned off for the project. -->
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<!-- You can turn off the Compile on Save (or Deploy on Save) setting -->
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<!-- in the project's Project Properties dialog box.-->
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<project name="codeoj" default="default" basedir=".">
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<description>Builds, tests, and runs the project codeoj.</description>
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<import file="nbproject/build-impl.xml"/>
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<!--
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There exist several targets which are by default empty and which can be
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used for execution of your tasks. These targets are usually executed
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before and after some main targets. They are:
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-pre-init: called before initialization of project properties
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-post-init: called after initialization of project properties
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-pre-compile: called before javac compilation
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-post-compile: called after javac compilation
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-pre-compile-single: called before javac compilation of single file
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-post-compile-single: called after javac compilation of single file
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-pre-compile-test: called before javac compilation of JUnit tests
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-post-compile-test: called after javac compilation of JUnit tests
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-pre-compile-test-single: called before javac compilation of single JUnit test
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-post-compile-test-single: called after javac compilation of single JUunit test
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-pre-dist: called before archive building
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-post-dist: called after archive building
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-post-clean: called after cleaning build products
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-pre-run-deploy: called before deploying
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-post-run-deploy: called after deploying
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Example of pluging an obfuscator after the compilation could look like
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<target name="-post-compile">
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<obfuscate>
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<fileset dir="${build.classes.dir}"/>
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</obfuscate>
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</target>
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For list of available properties check the imported
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nbproject/build-impl.xml file.
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Other way how to customize the build is by overriding existing main targets.
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The target of interest are:
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init-macrodef-javac: defines macro for javac compilation
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init-macrodef-junit: defines macro for junit execution
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init-macrodef-debug: defines macro for class debugging
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do-dist: archive building
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run: execution of project
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javadoc-build: javadoc generation
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Example of overriding the target for project execution could look like
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<target name="run" depends="<PROJNAME>-impl.jar">
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<exec dir="bin" executable="launcher.exe">
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<arg file="${dist.jar}"/>
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</exec>
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</target>
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Notice that overridden target depends on jar target and not only on
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compile target as regular run target does. Again, for list of available
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properties which you can use check the target you are overriding in
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nbproject/build-impl.xml file.
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-->
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</project>

‎build/web/META-INF/MANIFEST.MF

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Manifest-Version: 1.0
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‎build/web/META-INF/context.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<Context antiJARLocking="true" path="/codeoj"/>

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