From 30bbdad4ef99449f29f412d0b770e4b9f76ede42 Mon Sep 17 00:00:00 2001
From: mo khan <mo@mokhan.ca>
Date: Fri, 28 Mar 2025 17:49:09 -0600
Subject: refactor: move authorizers into authz package

---
 pkg/authz/cedar.go | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 pkg/authz/cedar.go

(limited to 'pkg/authz/cedar.go')

diff --git a/pkg/authz/cedar.go b/pkg/authz/cedar.go
new file mode 100644
index 00000000..1d952651
--- /dev/null
+++ b/pkg/authz/cedar.go
@@ -0,0 +1,53 @@
+package authz
+
+import (
+	"encoding/json"
+	"fmt"
+	"net"
+	"net/http"
+	"os"
+
+	cedar "github.com/cedar-policy/cedar-go"
+	"github.com/cedar-policy/cedar-go/types"
+	"github.com/xlgmokha/x/pkg/x"
+	xlog "gitlab.com/mokhax/spike/pkg/log"
+)
+
+func WithCedar() Authorizer {
+	var policy cedar.Policy
+	x.Check(policy.UnmarshalCedar(x.Must(os.ReadFile("cedar.conf"))))
+
+	policies := cedar.NewPolicySet()
+	policies.Add("cedar.conf", &policy)
+
+	var entities cedar.EntityMap
+	if err := json.Unmarshal(x.Must(os.ReadFile("cedar.json")), &entities); err != nil {
+		xlog.Logger.Error("Error", "error", err)
+		return nil
+	}
+
+	return AuthorizerFunc(func(r *http.Request) bool {
+		host, _, err := net.SplitHostPort(r.Host)
+		if err != nil {
+			return false
+		}
+
+		subject, found := TokenFrom(r).Subject()
+		if !found {
+			subject = "*"
+		}
+
+		req := cedar.Request{
+			Principal: cedar.NewEntityUID("Subject", cedar.String(subject)),
+			Action:    cedar.NewEntityUID("Action", cedar.String(r.Method)),
+			Resource:  cedar.NewEntityUID("Path", cedar.String(r.URL.Path)),
+			Context: cedar.NewRecord(cedar.RecordMap{
+				"Host": cedar.String(host),
+			}),
+		}
+
+		ok, diagnostic := policies.IsAuthorized(entities, req)
+		fmt.Printf("%v: %v -> %v %v%v %v\n", ok, subject, r.Method, host, r.URL.Path, diagnostic.Reasons)
+		return ok == types.Allow
+	})
+}
-- 
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