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4a2df93ae2
Removed cryptographically insecure sha1. This existed only for OPA compatibility. Also exclude bindings from main workspace Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>
70 lines
2.1 KiB
Markdown
70 lines
2.1 KiB
Markdown
# Regorus Java
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**Regorus** is
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- *Rego*-*Rus(t)* - A fast, light-weight [Rego](https://www.openpolicyagent.org/docs/latest/policy-language/)
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interpreter written in Rust.
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- *Rigorous* - A rigorous enforcer of well-defined Rego semantics.
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See main [Regorus page](https://github.com/microsoft/regorus) for more details about the project.
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## Building
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Due to operational overhead we don't publish Java bindings to Maven Central
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currently (see https://github.com/microsoft/regorus/issues/237) and you need to build from source to use it.
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In order to build Regorus Java for a target platform, you need to install Rust target for that platform first:
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```bash
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$ rustup target add aarch64-apple-darwin
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```
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Afterwards, you can build native library for that target using:
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```bash
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$ cargo build --release --target aarch64-apple-darwin
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```
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You will then have a native library at `target/aarch64-apple-darwin/release/libregorus_java.dylib` depending on your target.
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You then need to build Java bindings using:
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```bash
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$ mvn package
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```
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And you will have a JAR at `./target/regorus-java-0.1.5.jar`.
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## Usage
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You can use Regorus Java bindings as:
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```java
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import com.microsoft.regorus.Engine;
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public class Test {
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public static void main(String[] args) {
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try (Engine engine = new Engine()) {
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engine.addPolicy(
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"hello.rego",
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"package test\nmessage = concat(\", \", [input.message, data.message])"
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);
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engine.addDataJson("{\"message\":\"World!\"}");
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engine.setInputJson("{\"message\":\"Hello\"}");
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String resJson = engine.evalQuery("data.test.message");
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System.out.println(resJson);
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}
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}
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}
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```
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You need to ensure artifacts built in [previous section](#building) are in Java's classpath.
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For example with `java` CLI:
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```bash
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$ java -Djava.library.path=../../target/aarch64-apple-darwin/release/ -cp target/regorus-java-0.1.5.jar Test.java
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```
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should gave you the output:
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```
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{"result":[{"expressions":[{"value":"Hello, World!","text":"data.test.message","location":{"row":1,"col":1}}]}]}
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```
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