From 3291163206f16d2d624b98e11125abf76da36c47 Mon Sep 17 00:00:00 2001
From: mo khan <mo@mokhan.ca>
Date: Thu, 19 Jun 2025 17:33:31 -0600
Subject: refactor: extract a Authorizer Trait with a stub for a Cedar
 authorizer

---
 src/authorization.rs | 52 ++++++++++++++++++++++++++++++++++++++--------------
 src/main.rs          | 15 ++++++++-------
 2 files changed, 46 insertions(+), 21 deletions(-)

(limited to 'src')

diff --git a/src/authorization.rs b/src/authorization.rs
index 279f62cc..d86e8938 100644
--- a/src/authorization.rs
+++ b/src/authorization.rs
@@ -2,34 +2,58 @@ use envoy_types::ext_authz::v3::CheckResponseExt;
 use envoy_types::ext_authz::v3::pb::{CheckRequest, CheckResponse};
 use tonic::{Request, Response, Status};
 
-#[derive(Debug, Default)]
-pub struct CheckService;
+trait Authorizer {
+    fn authorize(&self, request: CheckRequest) -> bool;
+}
 
-#[tonic::async_trait]
-impl envoy_types::ext_authz::v3::pb::Authorization for CheckService {
-    async fn check(
-        &self,
-        request: Request<CheckRequest>,
-    ) -> Result<Response<CheckResponse>, Status> {
-        let request = request.into_inner();
+struct CedarAuthorizer {}
 
+impl CedarAuthorizer {
+    fn new() -> CedarAuthorizer {
+        return CedarAuthorizer {};
+    }
+}
+
+impl Authorizer for CedarAuthorizer {
+    fn authorize(&self, request: CheckRequest) -> bool {
         let client_headers = request
             .attributes
             .as_ref()
             .and_then(|attr| attr.request.as_ref())
             .and_then(|req| req.http.as_ref())
             .map(|http| &http.headers)
-            .ok_or_else(|| Status::invalid_argument("client headers not populated by envoy"))?;
-
-        let mut request_status = Status::unauthenticated("not authorized");
+            .ok_or_else(|| Status::invalid_argument("client headers not populated by envoy"))
+            .unwrap();
 
         if let Some(authorization) = client_headers.get("authorization") {
             if authorization == "Bearer valid-token" {
-                request_status = Status::ok("request is valid");
+                return true;
             }
         }
 
-        Ok(Response::new(CheckResponse::with_status(request_status)))
+        return false;
+    }
+}
+
+#[derive(Debug, Default)]
+pub struct CheckService;
+
+#[tonic::async_trait]
+impl envoy_types::ext_authz::v3::pb::Authorization for CheckService {
+    async fn check(
+        &self,
+        request: Request<CheckRequest>,
+    ) -> Result<Response<CheckResponse>, Status> {
+        let request = request.into_inner();
+
+        let authorizer = CedarAuthorizer::new();
+        if authorizer.authorize(request) {
+            return Ok(Response::new(CheckResponse::with_status(Status::ok("OK"))));
+        }
+
+        return Ok(Response::new(CheckResponse::with_status(
+            Status::unauthenticated("Unauthorized"),
+        )));
     }
 }
 
diff --git a/src/main.rs b/src/main.rs
index 917cace5..57f98b9a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,17 +7,18 @@ use authorization::CheckService;
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let addr = "[::1]:50051".parse()?;
-    let authorization_service = AuthorizationServer::new(CheckService::default());
+
     let (_health_reporter, health_service) = tonic_health::server::health_reporter();
 
-    let reflection_service = tonic_reflection::server::Builder::configure()
-        .register_encoded_file_descriptor_set(tonic_health::pb::FILE_DESCRIPTOR_SET)
-        .build_v1()
-        .unwrap();
     Server::builder()
-        .add_service(authorization_service)
+        .add_service(AuthorizationServer::new(CheckService::default()))
         .add_service(health_service)
-        .add_service(reflection_service)
+        .add_service(
+            tonic_reflection::server::Builder::configure()
+                .register_encoded_file_descriptor_set(tonic_health::pb::FILE_DESCRIPTOR_SET)
+                .build_v1()
+                .unwrap(),
+        )
         .serve(addr)
         .await?;
 
-- 
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