Gateway: multi-select answers and a summary endpoint for the complication

gateway/src/api.ts

@@ -18,7 +18,7 @@ import type { Hub } from "./hub.ts";
 import { HostError, type T3Host } from "./t3/host.ts";
 import { RpcError } from "./t3/rpc.ts";
 import type { ApprovalDecision, ModelSelection, ThreadShell } from "./t3/types.ts";
-import { buildFeed, buildThreadDetail, hostSummary, type SummaryCache } from "./views.ts";
+import { buildFeed, buildSummary, buildThreadDetail, hostSummary, type SummaryCache } from "./views.ts";
 
 export interface ApiDeps {
   db: Db;
@@ -135,6 +135,10 @@ export function createRoutes({ db, hub, cache, log = () => {} }: ApiDeps) {
       GET: authed(async () => json(await buildFeed(hub.list(), cache))),
     },
 
+    "/v1/summary": {
+      GET: authed(() => json(buildSummary(hub.list()))),
+    },
+
     "/v1/projects": {
       GET: authed(() =>
         json({
@@ -211,7 +215,7 @@ export function createRoutes({ db, hub, cache, log = () => {} }: ApiDeps) {
         if ("decision" in body) {
           if (!DECISIONS.has(body.decision)) throw new HttpError(400, "Unknown decision.");
           await host.dispatch({ ...base, decision: body.decision });
-        } else if ("answers" in body && body.answers && typeof body.answers === "object") {
+        } else if ("answers" in body && isAnswers(body.answers)) {
           await host.dispatch({ ...base, answers: body.answers });
         } else {
           throw new HttpError(400, "Send a decision or answers.");
@@ -242,6 +246,13 @@ export function createRoutes({ db, hub, cache, log = () => {} }: ApiDeps) {
   };
 }
 
+const isAnswers = (value: unknown): value is Record<string, string | string[]> =>
+  typeof value === "object" &&
+  value !== null &&
+  Object.values(value).every(
+    (answer) => typeof answer === "string" || (Array.isArray(answer) && answer.every((item) => typeof item === "string")),
+  );
+
 async function readBody<T>(req: Request): Promise<Partial<T> & T> {
   try {
     return (await req.json()) as Partial<T> & T;