https://github.com/sangkeon/java-opa-wasm

https://github.com/sangkeon/java-opa-wasm

Last synced: about 2 months ago
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• Host: GitHub
• URL: https://github.com/sangkeon/java-opa-wasm
• Owner: sangkeon
• License: apache-2.0
• Created: 2021-03-30T16:22:11.000Z (almost 4 years ago)
• Default Branch: main
• Last Pushed: 2024-04-10T05:00:07.000Z (9 months ago)
• Last Synced: 2024-08-03T21:01:23.031Z (5 months ago)
• Language: Java
• Size: 364 KB
• Stars: 15
• Watchers: 2
• Forks: 2
• Open Issues: 4
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-opa - JVM - Java SDK for calling Wasm-compiled policies. Uses wasmtime. (WebAssembly (Wasm) / Typescript)

README

        
# OPA(Open Policy Agent) WebAssembly SDK for Java

## About

OPA(www.openpolicyagent.org) ia a awesome policy engine for Cloud Native Application and Micro Services.

This project is a very sample-grade sdk to illustrate how to use wasm compiled rego policy for Java application.

This project uses https://github.com/kawamuray/wasmtime-java for WASM runtime.

Inspired by and, borrowed many ideas+codes from following projects. 

- golang-opa-wasm(https://github.com/open-policy-agent/golang-opa-wasm)

- npm-opa-wasm(https://github.com/open-policy-agent/npm-opa-wasm)

- dotnet-opa-wasm(https://github.com/christophwille/dotnet-opa-wasm)

Tested under OPA version 0.26.0

## Warning

- Very early stage project and almost sdk independent builtin functions not implemented(just place holder).

- If you are using an Apple Silicon Mac, see [FOR_APPLE_SILICON_USERS.md](./FOR_APPLE_SILICON_USERS.md) first./del>

## Usage

### Maven dependency ###

```

    

        io.github.sangkeon

        java-opa-wasm

        0.2.5

    

```

### To load and evaluate for OPA wasm file 

```

try (

    OPAModule om = new OPAModule("./sample-policy/wasm/policy.wasm");

) {

    String input = "{\"user\": \"john\"}";

    String data = "{\"role\":{\"john\":\"admin\"}}";

    om.setData(data);

    String result = om.evaluate(input, "opa/wasm/test/allowed");

    System.out.println("result=" + result);

}

```

### To load and evaluate for OPA bundle 

When using bundle, policy.wasm and data.json inside bundle will be loaded.

```

try {

    Bundle bundle = BundleUtil.extractBundle("./sample-policy/bundle/bundle.tar.gz");

    try (

        OPAModule om = new OPAModule(bundle);

    ) {

        String input = "{\"user\": \"alice\"}";

        String result = om.evaluate(input, "opa/wasm/test/allowed");

        System.out.println("result=" + result);

    }

} catch(Exception e) {

}

```