Add request-scoped context for session.getUser()

Use AsyncLocalStorage to provide request context so services can access
the current user without needing Call passed through every function.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

express/app.ts

@@ -6,6 +6,7 @@ import { match } from "path-to-regexp";
 import { Session } from "./auth";
 import { cli } from "./cli";
 import { contentTypes } from "./content-types";
+import { runWithContext } from "./context";
 import { httpCodes } from "./http-codes";
 import { routes } from "./routes";
 import { services } from "./services";
@@ -75,7 +76,10 @@ routes.forEach((route: Route, _idx: number, _allRoutes: Route[]) => {
         };
 
         try {
-            const retval = await route.handler(req);
+            const retval = await runWithContext(
+                { user: auth.user },
+                () => route.handler(req),
+            );
             return retval;
         } catch (error) {
             // Handle authentication errors

express/context.ts

@@ -0,0 +1,27 @@
+// context.ts
+//
+// Request-scoped context using AsyncLocalStorage.
+// Allows services to access request data (like the current user) without
+// needing to pass Call through every function.
+
+import { AsyncLocalStorage } from "node:async_hooks";
+import { AnonymousUser, type MaybeUser } from "./user";
+
+type RequestContext = {
+    user: MaybeUser;
+};
+
+const asyncLocalStorage = new AsyncLocalStorage<RequestContext>();
+
+// Run a function within a request context
+function runWithContext<T>(context: RequestContext, fn: () => T): T {
+    return asyncLocalStorage.run(context, fn);
+}
+
+// Get the current user from context, or AnonymousUser if not in a request
+function getCurrentUser(): MaybeUser {
+    const context = asyncLocalStorage.getStore();
+    return context?.user ?? AnonymousUser;
+}
+
+export { getCurrentUser, runWithContext, type RequestContext };

express/services/index.ts

@@ -1,9 +1,10 @@
 // services.ts
 
 import { AuthService } from "../auth";
+import { getCurrentUser } from "../context";
 import { db, migrate, migrationStatus, PostgresAuthStore } from "../database";
 import { getLogs, log } from "../logging";
-import { anonymousUser, type User } from "../user";
+import type { MaybeUser } from "../user";
 
 const database = {
     db,
@@ -29,8 +30,8 @@ const misc = {
 };
 
 const session = {
-    getUser: (): User => {
-        return anonymousUser;
+    getUser: (): MaybeUser => {
+        return getCurrentUser();
     },
 };