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+# AuthPolicy Integration with Authzed/SpiceDB
+
+This guide explains how to configure permission requests for a Google Zanzibar-based [Authzed/SpiceDB](https://authzed.com) instance using gRPC.
+
+## Prerequisites
+
+Kubernetes cluster with Kuadrant installed.
+
+### Create Gateway
+Create a `Gateway` resource for this guide:
+
+```sh
+kubectl apply -f -<<EOF
+apiVersion: gateway.networking.k8s.io/v1
+kind: Gateway
+metadata:
+  name: kuadrant-ingressgateway
+spec:
+  gatewayClassName: istio
+  listeners:
+  - name: http
+    protocol: HTTP
+    port: 80
+    allowedRoutes:
+      namespaces:
+        from: Same
+EOF
+```
+The `Gateway` resource created above uses Istio as the gateway provider. For Envoy Gateway, use the Envoy Gateway `GatewayClass` as the `gatewayClassName`.
+
+### Deploy Toy Store application
+
+Deploy a simple HTTP application service that echoes back the request data: 
+
+```sh
+kubectl apply -f https://raw.githubusercontent.com/Kuadrant/kuadrant-operator/refs/heads/main/examples/toystore/toystore.yaml
+```
+
+### Expose the Application
+Create an `HTTPRoute` to expose a `/posts` path for `GET` and `POST` requests to the application:
+
+```sh
+kubectl apply -f - <<EOF
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: toystore
+spec:
+  parentRefs:
+  - name: kuadrant-ingressgateway
+    namespace: gateway-system
+  hostnames:
+  - api.toystore.com
+  rules:
+  - matches: 
+    - method: GET
+      path:
+        type: PathPrefix
+        value: "/posts"
+    - method: POST
+      path:
+        type: PathPrefix
+        value: "/posts"
+    backendRefs:
+    - name: toystore
+      port: 80
+EOF
+```
+
+Export the gateway hostname and port for testing:
+
+```sh
+export INGRESS_HOST=$(kubectl get gtw kuadrant-ingressgateway -n gateway-system -o jsonpath='{.status.addresses[0].value}')
+export INGRESS_PORT=$(kubectl get gtw kuadrant-ingressgateway -n gateway-system -o jsonpath='{.spec.listeners[?(@.name=="http")].port}')
+export GATEWAY_URL=$INGRESS_HOST:$INGRESS_PORT
+```
+
+### Test the Unprotected Application
+Test requests to the unprotected application:
+
+```sh
+curl -H 'Host: api.toystore.com' http://$GATEWAY_URL/posts -i
+# HTTP/1.1 200 OK
+```
+
+### Create the permission database
+
+Create the namespace for SpiceDB:
+
+```sh
+kubectl create namespace spicedb
+```
+
+Deploy the SpiceDB instance:
+
+```sh
+kubectl -n spicedb apply -f -<<EOF
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: spicedb
+  labels:
+    app: spicedb
+spec:
+  selector:
+    matchLabels:
+      app: spicedb
+  template:
+    metadata:
+      labels:
+        app: spicedb
+    spec:
+      containers:
+      - name: spicedb
+        image: authzed/spicedb
+        args:
+        - serve
+        - "--grpc-preshared-key"
+        - secret
+        - "--http-enabled"
+        ports:
+        - containerPort: 50051
+        - containerPort: 8443
+  replicas: 1
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: spicedb
+spec:
+  selector:
+    app: spicedb
+  ports:
+    - name: grpc
+      port: 50051
+      protocol: TCP
+    - name: http
+      port: 8443
+      protocol: TCP
+EOF
+```
+
+Forward local request to the SpiceDB service inside the cluster:
+
+```sh
+kubectl -n spicedb port-forward service/spicedb 8443:8443 2>&1 >/dev/null &
+```
+
+Create the permission schema:
+
+```sh
+curl -X POST http://localhost:8443/v1/schema/write \
+  -H 'Authorization: Bearer secret' \
+  -H 'Content-Type: application/json' \
+  -d @- << EOF
+{
+  "schema": "definition blog/user {}\ndefinition blog/post {\n\trelation reader: blog/user\n\trelation writer: blog/user\n\n\tpermission read = reader + writer\n\tpermission write = writer\n}"
+}
+EOF
+```
+
+Create the relationships:
+
+- `blog/user:emilia` → `writer` of `blog/post:1`
+- `blog/user:beatrice` → `reader` of `blog/post:1`
+
+```sh
+curl -X POST http://localhost:8443/v1/relationships/write \
+  -H 'Authorization: Bearer secret' \
+  -H 'Content-Type: application/json' \
+  -d @- << EOF
+{
+  "updates": [
+    {
+      "operation": "OPERATION_CREATE",
+      "relationship": {
+        "resource": {
+          "objectType": "blog/post",
+          "objectId": "1"
+        },
+        "relation": "writer",
+        "subject": {
+          "object": {
+            "objectType": "blog/user",
+            "objectId": "emilia"
+          }
+        }
+      }
+    },
+    {
+      "operation": "OPERATION_CREATE",
+      "relationship": {
+        "resource": {
+          "objectType": "blog/post",
+          "objectId": "1"
+        },
+        "relation": "reader",
+        "subject": {
+          "object": {
+            "objectType": "blog/user",
+            "objectId": "beatrice"
+          }
+        }
+      }
+    }
+  ]
+}
+EOF
+```
+
+### Create an `AuthPolicy`
+
+Store the shared token for Authorino authentication with the SpiceDB instance (must be created in the same namespace as the Kuadrant CR):
+
+```sh
+kubectl -n kuadrant-system apply -f -<<EOF
+apiVersion: v1
+kind: Secret
+metadata:
+  name: spicedb
+  labels:
+    app: spicedb
+stringData:
+  grpc-preshared-key: secret
+EOF
+```
+
+Create `AuthPolicy` custom resource declaring the auth rules to be enforced:
+
+```sh
+kubectl apply -f - <<EOF
+apiVersion: kuadrant.io/v1
+kind: AuthPolicy
+metadata:
+  name: route-auth
+spec:
+  targetRef:
+    group: gateway.networking.k8s.io
+    kind: HTTPRoute
+    name: toystore
+  defaults:
+    strategy: atomic
+    rules:
+      authentication:
+        "blog-users":
+          apiKey:
+            selector:
+              matchLabels:
+                app: talker-api
+            allNamespaces: true
+          credentials:
+            authorizationHeader:
+              prefix: APIKEY
+      authorization:
+        "authzed-spicedb":
+          spicedb:
+            endpoint: spicedb.spicedb.svc.cluster.local:50051
+            insecure: true
+            sharedSecretRef:
+              name: spicedb
+              key: grpc-preshared-key
+            subject:
+              kind:
+                value: blog/user
+              name:
+                selector: auth.identity.metadata.annotations.username
+            resource:
+              kind:
+                value: blog/post
+              name:
+                selector: context.request.http.path.@extract:{"sep":"/","pos":2}
+            permission:
+              selector: context.request.http.method.@replace:{"old":"GET","new":"read"}.@replace:{"old":"POST","new":"write"}
+EOF
+```
+
+### Create the API keys
+
+For Emilia (writer):
+
+```sh
+kubectl apply -f -<<EOF
+apiVersion: v1
+kind: Secret
+metadata:
+  name: api-key-writer
+  labels:
+    authorino.kuadrant.io/managed-by: authorino
+    app: talker-api
+  annotations:
+    username: emilia
+stringData:
+  api_key: IAMEMILIA
+EOF
+```
+
+For Beatrice (reader):
+
+```sh
+kubectl apply -f -<<EOF
+apiVersion: v1
+kind: Secret
+metadata:
+  name: api-key-reader
+  labels:
+    authorino.kuadrant.io/managed-by: authorino
+    app: talker-api
+  annotations:
+    username: beatrice
+stringData:
+  api_key: IAMBEATRICE
+EOF
+```
+
+### Consume the API
+
+As Emilia, send a `GET` request:
+
+```sh
+curl -H 'Host: api.toystore.com' -H 'Authorization: APIKEY IAMEMILIA' \
+     -X GET \
+     http://$GATEWAY_URL/posts/1 -i
+# HTTP/1.1 200 OK
+```
+
+As Emilia, send a `POST` request:
+
+```sh
+curl -H 'Host: api.toystore.com' -H 'Authorization: APIKEY IAMEMILIA' \
+     -X POST \
+     http://$GATEWAY_URL/posts/1 -i
+# HTTP/1.1 200 OK
+```
+
+As Beatrice, send a `GET` request:
+
+```sh
+curl -H 'Host: api.toystore.com' -H 'Authorization: APIKEY IAMBEATRICE' \
+     -X GET \
+     http://$GATEWAY_URL/posts/1 -i
+# HTTP/1.1 200 OK
+```
+
+As Beatrice, send a `POST` request:
+
+```sh
+curl -H 'Host: api.toystore.com' -H 'Authorization: APIKEY IAMBEATRICE' \
+     -X POST \
+      http://$GATEWAY_URL/posts/1 -i
+# HTTP/1.1 403 Forbidden
+# x-ext-auth-reason: PERMISSIONSHIP_NO_PERMISSION;token=GhUKEzE2NzU3MDE3MjAwMDAwMDAwMDA=
+```
+
+## Cleanup
+
+```sh
+kubectl delete -f https://raw.githubusercontent.com/Kuadrant/kuadrant-operator/refs/heads/main/examples/toystore/toystore.yaml
+kubectl delete httproute toystore
+kubectl delete authpolicy route-auth
+kubectl delete kuadrant kuadrant -n kuadrant-system
+kubectl delete namespace spicedb
+kubectl delete secret api-key-reader 
+kubectl delete secret api-key-writer 
+kubectl delete secret spicedb -n kuadrant-system
+```