Fix panic-on-missing-env in auth middleware and ticket provider

require_auth and NxtgaugeTicketProvider::create_ticket both called
env::var(...).expect(...) on every request, crashing instead of
returning a proper error when JWT_SECRET/AI_SERVICE_KEY were unset.
Both are now loaded once into AppConfig at startup and checked with
a graceful 401/500 response.

.env.example

@@ -10,3 +10,10 @@ OLLAMA_EMBED_MODEL=nomic-embed-text
 
 HELP_CENTER_SEED_PATH=./seeds/help_articles.json
 TICKETS_SOURCE=chatbot
+NXTGAUGE_USERS_URL=http://localhost:9101
+
+# Required: must match the JWT signing secret used by nxtgauge-backend-rust,
+# and the AI service key nxtgauge-backend-rust expects on X-AI-Service-Key.
+# Requests fail closed (401/500) if these are unset, rather than crashing.
+JWT_SECRET=
+AI_SERVICE_KEY=

src/auth.rs

@@ -1,5 +1,5 @@
 use axum::{
-    extract::Request,
+    extract::{Request, State},
     http::{header::AUTHORIZATION, StatusCode},
     middleware::Next,
     response::{IntoResponse, Response},
@@ -8,6 +8,8 @@ use axum::{
 use jsonwebtoken::{decode, Algorithm, DecodingKey, Validation};
 use serde::{Deserialize, Serialize};
 
+use crate::state::AppState;
+
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct Claims {
     pub sub: String,
@@ -25,7 +27,23 @@ pub struct AuthUser {
     pub claims: Claims,
 }
 
-pub async fn require_auth(mut request: Request, next: Next) -> Response {
+pub async fn require_auth(
+    State(state): State<AppState>,
+    mut request: Request,
+    next: Next,
+) -> Response {
+    if state.config.jwt_secret.is_empty() {
+        tracing::error!("rejecting request: JWT_SECRET is not configured");
+        return (
+            StatusCode::INTERNAL_SERVER_ERROR,
+            Json(serde_json::json!({
+                "error": "Authentication is misconfigured",
+                "code": "AUTH_MISCONFIGURED"
+            })),
+        )
+            .into_response();
+    }
+
     let auth_header = request
         .headers()
         .get(AUTHORIZATION)
@@ -46,11 +64,9 @@ pub async fn require_auth(mut request: Request, next: Next) -> Response {
         }
     };
 
-    let jwt_secret = std::env::var("JWT_SECRET").expect("JWT_SECRET must be set");
-
     let token_data = match decode::<Claims>(
         &token,
-        &DecodingKey::from_secret(jwt_secret.as_bytes()),
+        &DecodingKey::from_secret(state.config.jwt_secret.as_bytes()),
         &Validation::new(Algorithm::HS256),
     ) {
         Ok(data) => data,

src/config/mod.rs

@@ -15,6 +15,8 @@ pub struct AppConfig {
     pub help_center_seed_path: String,
     pub tickets_source: String,
     pub nxtgauge_users_url: String,
+    pub jwt_secret: String,
+    pub ai_service_key: String,
 }
 
 impl AppConfig {
@@ -47,6 +49,20 @@ impl AppConfig {
                 "NXTGAUGE_USERS_URL",
                 "http://nxtgauge-rust-users:9101",
             ),
+            jwt_secret: {
+                let v = std::env::var("JWT_SECRET").unwrap_or_default();
+                if v.is_empty() {
+                    tracing::error!("JWT_SECRET is not set; all authenticated requests will be rejected");
+                }
+                v
+            },
+            ai_service_key: {
+                let v = std::env::var("AI_SERVICE_KEY").unwrap_or_default();
+                if v.is_empty() {
+                    tracing::error!("AI_SERVICE_KEY is not set; ticket creation will fail");
+                }
+                v
+            },
         }
     }
 

src/main.rs

@@ -85,6 +85,7 @@ async fn main() {
         http_client,
         cfg.nxtgauge_users_url.clone(),
         cfg.tickets_source.clone(),
+        cfg.ai_service_key.clone(),
     ));
 
     let state = AppState::new(

src/providers/tickets/nxtgauge_ticket_provider.rs

@@ -12,6 +12,7 @@ pub struct NxtgaugeTicketProvider {
     client: Client,
     base_url: String,
     source: String,
+    ai_service_key: String,
 }
 
 #[derive(Debug, Deserialize)]
@@ -31,11 +32,12 @@ struct NxtgaugeTicketRequest {
 }
 
 impl NxtgaugeTicketProvider {
-    pub fn new(client: Client, base_url: String, source: String) -> Self {
+    pub fn new(client: Client, base_url: String, source: String, ai_service_key: String) -> Self {
         Self {
             client,
             base_url,
             source,
+            ai_service_key,
         }
     }
 }
@@ -56,13 +58,16 @@ impl TicketProvider for NxtgaugeTicketProvider {
             user_id: Some(payload.user_id),
         };
 
-        let ai_service_key = std::env::var("AI_SERVICE_KEY")
-            .expect("AI_SERVICE_KEY must be set");
+        if self.ai_service_key.is_empty() {
+            return Err(AppError::ExternalService(
+                "AI_SERVICE_KEY is not configured".to_string(),
+            ));
+        }
 
         let response = self
             .client
             .post(&url)
-            .header("X-AI-Service-Key", ai_service_key)
+            .header("X-AI-Service-Key", &self.ai_service_key)
             .json(&req)
             .send()
             .await

src/routes/mod.rs

@@ -44,7 +44,7 @@ pub fn build_router(state: AppState) -> Router {
                 .route("/tickets/create", post(handlers::tickets::create))
                 .route("/help/search", post(handlers::help::search))
                 .route("/actions/confirm", post(handlers::confirm_action::confirm_action))
-                .layer(middleware::from_fn(require_auth)),
+                .layer(middleware::from_fn_with_state(state.clone(), require_auth)),
         )
         .layer(cors)
         .layer(TraceLayer::new_for_http())