cedar-agent-go-sdk

cedar-agent-go-sdk

Cedar Agent is an HTTP Server that runs the Cedar authorization engine.

It's the easiest way to get up and running with Cedar locally, offering a REST API for managing your entities and policies, as well as policy evaluation.

Cedar lets you answer the question: Is this user (principal) allowed to perform this action on this resource?

Installation

go get -u github.com/kevinmichaelchen/cedar-agent-go-sdk

Usage

Creating a client

package main

import (
	"github.com/kevinmichaelchen/cedar-agent-go-sdk/sdk"
	"net/http"
)

func initClient() *sdk.Client {
	c := &http.Client{}

	// The options are entirely ... optional 🙂
	return sdk.NewClient(c,
		sdk.WithBaseURL("http://localhost:8180"),
		sdk.WithParallelizationFactor(3),
	)
}

Performing authorization checks

package main

import (
	"context"
	"fmt"
	"github.com/kevinmichaelchen/cedar-agent-go-sdk/sdk"
	"net/http"
)

func main() {
	ctx := context.Background()
	client := initClient()
	allowed := isAuthorized(ctx, client,
		sdk.CheckRequest{
			Principal: `User::"42"`,
			Action: "viewFoobar",
			Resource: `Foobar::"101"`,
		},
	)
	fmt.Printf("allowed: %t", allowed)
}

func isAuthorized(ctx context.Context, client *sdk.Client, r sdk.CheckRequest) bool {
	res, err := client.Check(ctx, r)
	if err != nil {
		panic(err)
	}
	return res.Allowed
}

Authorizing a batch

Sometimes you want to authorize a principal against multiple resources, potentially with multiple actions.

package main

import (
	"context"
	"fmt"
	"github.com/kevinmichaelchen/cedar-agent-go-sdk/sdk"
	"net/http"
)

func main() {
	ctx := context.Background()
	client := initClient()

	principal := `User::"42"`

	requests := map[sdk.Action][]sdk.Resource{
		"viewFoo": {
			`Foo::"12"`,
			`Foo::"39"`,
			`Foo::"72"`,
		},
		"viewBar": {
			`Bar::"12"`,
		},
	}

	out, err := client.CheckBatch(ctx, principal, requests, 5)
	if err != nil {
		panic(err)
	}

	for req, decision := range out {
		fmt.Printf("request: %v, decision: %t", req, decision.Allowed)
	}
}