To create an online compiler

I don't know much about it, but as far as I've heard...

• Wandbox
  • Techniques to Support the Wandbox#21

    Lock up your environment with chroot

  • Code: https://github.com/melpon/wandbox
• AtCoderJudge Server
  • https://twitter.com/chokudai/status/1076367979686678529

    By the way, there was no Docker for the initial AtCoder's jash server, so I wrote it in full scratch (you controlled it with cgroups, didn't you?), and the current AtCoder is on LXC.

• Techniques to Support the Wandbox#21

  Lock up your environment with chroot

• Code: https://github.com/melpon/wandbox

Lock up your environment with chroot

• https://twitter.com/chokudai/status/1076367979686678529

  By the way, there was no Docker for the initial AtCoder's jash server, so I wrote it in full scratch (you controlled it with cgroups, didn't you?), and the current AtCoder is on LXC.

By the way, there was no Docker for the initial AtCoder's jash server, so I wrote it in full scratch (you controlled it with cgroups, didn't you?), and the current AtCoder is on LXC.

A few years ago, I created a system to compile and test the code that users entered in textarea and so on on the server side.

I don't know if it's modern or not, but I usually did it as follows.

Compiling

• Save the user input code to a file so that the compiler can read and write using StandardJavaFileManager (it would be nice to implement the interface above and do it all on-memory, but I made it a file with the policy below.)
• Get the compiler from javax.tools.ToolProvider.getSystemJavaCompiler()
• JavaCompiler.CompilationTask compilation=compiler.getTask(...)
• compilation.call() prints the class file to the location you set in fileManager earlier (compilation errors can be caught as Java exceptions)

When to Run

• Create a java policy file to restrict files and network access (Note https://docs.oracle.com/javase/jp/7/technotes/guides/security/PolicyFiles.html)
• javaSpecify -Djava.security.policy= (policy file path) as the argument for the command
• If you want to be variable in the policy file, such as the location of the user code, refer to the system properties in the policy file, and pass the value to the argument of the java command like -Dsome.property.key=hoge.

I hope it will be helpful.