tsandall / validating-and-mutating-example

A small example project containing a validating and mutating policy.

🛠 Validating and Mutating Admission Control Example 🛠

This repository contains a small example of how to combine validating and mutating admission control policies in OPA using the entry point contributed to the open-policy-agent/library repository.

Examples

• 🔪 The mutating policy sets an annotation on objects that indicate a requirement.
• 🛡️ The validating policy example checks for a specific label.

There are four files:

• main.rego is the entry point from the library repository copied with minor changes.
• main_test.rego shows an end-to-end test of the validating and mutating policies.
• validate-deny-missing-label.rego shows a trivial validation policy with unit testing.
• patch-add-dummy-annotation.rego shows a trivial mutating policy with unit testing.

Running

You can run the tests on the command-line:

opa test -b . -v

You can evaluate the entire policy with an example input on the command-line:

opa eval -b . -i input.json 'data.system.main'

Hint: check out the 'Open Policy Agent' extension for VS Code. Try the OPA: Test Workspace, OPA: Evaluate Selection, and OPA: Toggle Evaluation Coverage commands on this project.