feat(m7.1): wire compliance-agent to compliance-core auth + status gate (#85)

compliance-agent/src/api/auth_middleware.rs

@@ -1,113 +0,0 @@
-use std::sync::Arc;
-
-use axum::{
-    extract::Request,
-    middleware::Next,
-    response::{IntoResponse, Response},
-};
-use jsonwebtoken::{decode, decode_header, jwk::JwkSet, DecodingKey, Validation};
-use reqwest::StatusCode;
-use serde::Deserialize;
-use tokio::sync::RwLock;
-
-/// Cached JWKS from Keycloak for token validation.
-#[derive(Clone)]
-pub struct JwksState {
-    pub jwks: Arc<RwLock<Option<JwkSet>>>,
-    pub jwks_url: String,
-}
-
-#[derive(Debug, Deserialize)]
-struct Claims {
-    #[allow(dead_code)]
-    sub: String,
-}
-
-const PUBLIC_ENDPOINTS: &[&str] = &["/api/v1/health"];
-
-/// Middleware that validates Bearer JWT tokens against Keycloak's JWKS.
-///
-/// Skips validation for health check endpoints.
-/// If `JwksState` is not present as an extension (keycloak not configured),
-/// all requests pass through.
-pub async fn require_jwt_auth(request: Request, next: Next) -> Response {
-    let path = request.uri().path();
-
-    if PUBLIC_ENDPOINTS.contains(&path) {
-        return next.run(request).await;
-    }
-
-    let jwks_state = match request.extensions().get::<JwksState>() {
-        Some(s) => s.clone(),
-        None => return next.run(request).await,
-    };
-
-    let auth_header = match request.headers().get("authorization") {
-        Some(h) => h,
-        None => return (StatusCode::UNAUTHORIZED, "Missing authorization header").into_response(),
-    };
-
-    let token = match auth_header.to_str() {
-        Ok(s) if s.starts_with("Bearer ") => &s[7..],
-        _ => return (StatusCode::UNAUTHORIZED, "Invalid authorization header").into_response(),
-    };
-
-    match validate_token(token, &jwks_state).await {
-        Ok(()) => next.run(request).await,
-        Err(e) => {
-            tracing::warn!("JWT validation failed: {e}");
-            (StatusCode::UNAUTHORIZED, "Invalid token").into_response()
-        }
-    }
-}
-
-async fn validate_token(token: &str, state: &JwksState) -> Result<(), String> {
-    let header = decode_header(token).map_err(|e| format!("failed to decode JWT header: {e}"))?;
-
-    let kid = header
-        .kid
-        .ok_or_else(|| "JWT missing kid header".to_string())?;
-
-    let jwks = fetch_or_get_jwks(state).await?;
-
-    let jwk = jwks
-        .keys
-        .iter()
-        .find(|k| k.common.key_id.as_deref() == Some(&kid))
-        .ok_or_else(|| "no matching key found in JWKS".to_string())?;
-
-    let decoding_key =
-        DecodingKey::from_jwk(jwk).map_err(|e| format!("failed to create decoding key: {e}"))?;
-
-    let mut validation = Validation::new(header.alg);
-    validation.validate_exp = true;
-    validation.validate_aud = false;
-
-    decode::<Claims>(token, &decoding_key, &validation)
-        .map_err(|e| format!("token validation failed: {e}"))?;
-
-    Ok(())
-}
-
-async fn fetch_or_get_jwks(state: &JwksState) -> Result<JwkSet, String> {
-    {
-        let cached = state.jwks.read().await;
-        if let Some(ref jwks) = *cached {
-            return Ok(jwks.clone());
-        }
-    }
-
-    let resp = reqwest::get(&state.jwks_url)
-        .await
-        .map_err(|e| format!("failed to fetch JWKS: {e}"))?;
-
-    let jwks: JwkSet = resp
-        .json()
-        .await
-        .map_err(|e| format!("failed to parse JWKS: {e}"))?;
-
-    let mut cached = state.jwks.write().await;
-    *cached = Some(jwks.clone());
-
-    Ok(jwks)
-}

compliance-agent/src/api/mod.rs

@@ -1,4 +1,3 @@
-pub mod auth_middleware;
 pub mod handlers;
 pub mod routes;
 pub mod server;

compliance-agent/src/api/server.rs

@@ -7,8 +7,9 @@ use tower_http::cors::CorsLayer;
 use tower_http::set_header::SetResponseHeaderLayer;
 use tower_http::trace::TraceLayer;
 
+use compliance_core::auth::{require_jwt_auth, require_tenant_status, JwksState};
+
 use crate::agent::ComplianceAgent;
-use crate::api::auth_middleware::{require_jwt_auth, JwksState};
 use crate::api::routes;
 use crate::error::AgentError;
 
@@ -44,9 +45,13 @@ pub async fn start_api_server(agent: ComplianceAgent, port: u16) -> Result<(), A
             jwks_url,
         };
         tracing::info!("Keycloak JWT auth enabled for realm '{kc_realm}'");
+        // Layers execute outermost-first. Extension(jwks_state) must run
+        // before require_jwt_auth so the middleware can read it; the
+        // status gate runs after JWT so TenantContext is in extensions.
         app = app
-            .layer(Extension(jwks_state))
-            .layer(middleware::from_fn(require_jwt_auth));
+            .layer(middleware::from_fn(require_tenant_status))
+            .layer(middleware::from_fn(require_jwt_auth))
+            .layer(Extension(jwks_state));
     } else {
         tracing::warn!("Keycloak not configured - API endpoints are unprotected");
     }