Rego Cheat Sheet Examples

Pre-requisites

1. Understanding of open policy agent
2. Basic understanding of rego and rego playground
3. Opa version : 0.13.5 (minimum)

Steps To Install Opa

1. Download OPA

1.1. Download using OPA binary for your platform from GitHub Releases.

For macOS (64-bit) and Linux (64-bit) : 
  curl -L -o opa https://openpolicyagent.org/downloads/latest/opa_darwin_amd64
  For Windows download using the link here: Link

1.2. Download and run OPA via docker

Docker Link for OPA image: DockerImage

2. Set permissions on the OPA executable

chmod 755 ./opa

3. Run OPA as a server

./opa run --server 

(By default OPA listens for HTTP connections on 0.0.0.0:8181)

4.Curls to Push policy files, data files, and post a request

Push data file to the server

curl -X PUT http://localhost:8181/v1/data/{myData} --data-binary @{myData}.json

Push rego file to the server

curl -X PUT http://localhost:8181/v1/policies/{mypolicy} --data-binary @{mypolicy}.rego

Execute the rules

curl --location --request POST 'http://localhost:8181/v1/data/$policyPath$/{ruleName}' \
--header 'Content-Type: text/plain' \
--data-raw '{Input_Json}'

5. Run test on OPA

   From the root directory containing rego files and data files(JSON), run the following command:

 opa test . -v

For details refer: OPA Documentation Testing