What?

This is an incomplete and unofficial OPA Rego interpreter. It executes Rego policies using ANTLR4 visitor for the Rego grammar described in rego-grammar module. It is a Java replacement for OPA runtime which is implemented in Go.

Why?

Because Java. This library also allows invoking user defined Java functions from Rego policy.

Usage

See MergedUTTest.java for examples.

Limitations / TODO

1. Many in-built functions are currently missing (see ExprLibrary.java for currently supported functions).
2. Parts of the grammar are left unimplemented (see test policies for coverage).
   1. The some keyword doesn't support multi-valued resolution (e.g. some i; var[[1, i]] won't work).
3. Policy is processed linearly. This example behaves differently in OPA playground: package p a{b} b{true}
4. No partial evaluation support.

Links

• OPA: https://www.openpolicyagent.org/
• OPA Playground: https://play.openpolicyagent.org/

Security

See CONTRIBUTING for more information.

License

This project is licensed under the Apache-2.0 License.