feat: add functional authentication

api/libraries/server/context.ts

@@ -1,16 +1,41 @@
-import { RouteContext } from "@spec/relay";
+import { ServerContext, UnauthorizedError } from "@spec/relay";
 
-export function getRequestContext(request: Request): RouteContext {
-  return {
-    request,
-  };
-}
+import { Session } from "../auth/auth.ts";
+import { req } from "./request.ts";
 
 declare module "@spec/relay" {
-  interface RouteContext {
+  interface ServerContext {
     /**
      * Current request instance being  handled.
      */
     request: Request;
+
+    /**
+     * Get request session instance.
+     */
+    session: Session;
+
+    /**
+     * Get account id from session, throws an error if the request
+     * does not have a valid session.
+     */
+    accountId: string;
   }
 }
+
+export function getRequestContext(request: Request): ServerContext {
+  return {
+    request,
+
+    get session(): Session {
+      if (req.session === undefined) {
+        throw new UnauthorizedError();
+      }
+      return req.session;
+    },
+
+    get accountId() {
+      return this.session.accountId;
+    },
+  };
+}