OpaDotNet.Wasm 1.0.0-preview0011

This is a prerelease version of OpaDotNet.Wasm.
There is a newer version of this package available.
See the version list below for details.
dotnet add package OpaDotNet.Wasm --version 1.0.0-preview0011
                    
NuGet\Install-Package OpaDotNet.Wasm -Version 1.0.0-preview0011
                    
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="OpaDotNet.Wasm" Version="1.0.0-preview0011" />
                    
For projects that support PackageReference, copy this XML node into the project file to reference the package.
<PackageVersion Include="OpaDotNet.Wasm" Version="1.0.0-preview0011" />
                    
Directory.Packages.props
<PackageReference Include="OpaDotNet.Wasm" />
                    
Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package.
paket add OpaDotNet.Wasm --version 1.0.0-preview0011
                    
#r "nuget: OpaDotNet.Wasm, 1.0.0-preview0011"
                    
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
#:package OpaDotNet.Wasm@1.0.0-preview0011
                    
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package.
#addin nuget:?package=OpaDotNet.Wasm&version=1.0.0-preview0011&prerelease
                    
Install as a Cake Addin
#tool nuget:?package=OpaDotNet.Wasm&version=1.0.0-preview0011&prerelease
                    
Install as a Cake Tool

Open Policy Agent (OPA) WebAssembly dotnet core SDK

This is SDK for using WebAssembly (wasm) compiled Open Policy Agent Rego policies with dotnet core.

Initial implementation was based on Open Policy Agent WebAssemby NPM Module

Supported ABI

Version Status
1.0 ✔️
1.2 ✔️
1.3 ✔️

Getting Started

Install nuget package

dotnet add package OpaDotNet.Wasm

Usage

To evaluate OPA policy you need to:

Load compiled policy

using using OpaDotNet.Wasm;

var factory = new OpaEvaluatorFactory();

const string data = "{ \"world\": \"world\" }";

using var engine = factory.CreateWithJsonData(
    File.OpenRead("policy.wasm"),
    data
    );

Evaluate policy

IOpaEvaluator has several APIs for policy evaluation:

  • EvaluatePredicate - Evaluates named policy with specified input. Response interpreted as simple true/false result.
  • Evaluate - Evaluates named policy with specified input.
  • EvaluateRaw - Evaluates named policy with specified raw JSON input.
var policyResult = engine.EvaluatePredicate(inp);

Check result

if (policyResult)
{
    // We've been authorized.
}
else
{
    // Can't do that.
}

Writing policy

See writing policy

Compiling policy

You have several options to compile rego policy into wasm module:

package example

default hello = false

hello {
    x := input.message
    x == data.world
}

Manually

Either use the Compile REST API or opa build CLI tool.

For example, with OPA v0.20.5+:

opa build -t wasm -e example/hello example.rego

Which is compiling the example.rego policy file. The result will be an OPA bundle with the policy.wasm binary included. See (./samples) for a more comprehensive example.

See opa build --help for more details.

With OpaDotNet.Wasm.Compilation

You can use SDK to do compilation for you.

Important. You will need opa cli tool to be in your PATH or provide full path in RegoCliCompilerOptions.

using OpaDotNet.Wasm;
using OpaDotNet.Wasm.Compilation;

var options = new OptionsWrapper<RegoCliCompilerOptions>(new RegoCliCompilerOptions());
var compiler = new RegoCliCompiler(options);
var policyStream = await compiler.CompileFile("example.rego", new[] { "example/hello" });

// Use compiled policy.
var factory = new OpaEvaluatorFactory();

using var engine = factory.CreateWithJsonData(policyStream);

3rd Party Libraries and Contributions

  • OPA - An open source, general-purpose policy engine that unifies policy enforcement across the stack.
  • Moq - The most popular and friendly mocking library for .NET.
  • xUnit.net - Free, open source, community-focused unit testing tool for the .NET Framework.
  • wasmtime-dotnet - .NET embedding of Wasmtime.
Product Compatible and additional computed target framework versions.
.NET net7.0 is compatible.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 was computed.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 was computed.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (1)

Showing the top 1 NuGet packages that depend on OpaDotNet.Wasm:

Package Downloads
OpaDotNet.Extensions.AspNetCore

Package Description

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Version Downloads Last Updated
3.0.1 1,402 3/11/2025
3.0.0-preview-0040 251 3/5/2025
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3.0.0-preview-0001 133 10/25/2024
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2.2.0-preview0010 207 10/9/2023
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2.1.1 222 9/29/2023
2.1.0 224 9/28/2023
2.0.0 382 8/18/2023
2.0.0-preview0012 189 8/18/2023
2.0.0-preview 196 8/17/2023
1.4.0 298 8/15/2023
1.3.0 237 8/9/2023
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1.2.0-preview0033 206 7/25/2023
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1.1.0-preview0018 221 7/6/2023
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1.1.0-preview0012 194 7/6/2023
1.1.0-preview0011 211 7/5/2023
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1.1.0-preview0007 183 7/3/2023
1.0.0 245 6/27/2023
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1.0.0-preview0041 157 6/22/2023
1.0.0-preview0040 205 6/22/2023
1.0.0-preview0037 184 6/22/2023
1.0.0-preview0036 199 6/22/2023
1.0.0-preview0032 206 6/22/2023
1.0.0-preview0031 205 6/22/2023
1.0.0-preview0029 190 6/21/2023
1.0.0-preview0027 205 6/21/2023
1.0.0-preview0025 198 6/21/2023
1.0.0-preview0023 215 6/21/2023
1.0.0-preview0021 165 6/20/2023
1.0.0-preview0012 167 6/20/2023
1.0.0-preview0011 205 6/20/2023