fix(web): validate ontology pagination (#138)

apps/logicsrc-web/contract/ontology-api.contract.test.ts

@@ -102,6 +102,32 @@ describe("reads", () => {
     expect(payload.total).toBeGreaterThan(3);
   });
 
+  it("falls back safely for negative and malformed pagination values", async () => {
+    const entityResponse = await listEntities(
+      request(`/api/ontologies/${ONTOLOGY}/entities?limit=-1&offset=invalid`),
+      params({ ontologyId: ONTOLOGY })
+    );
+    const entityPayload = await body<{ limit: number; offset: number }>(entityResponse);
+    expect(entityPayload.limit).toBe(50);
+    expect(entityPayload.offset).toBe(0);
+
+    const claimResponse = await listClaims(
+      request(`/api/ontologies/${ONTOLOGY}/claims?limit=1.5`),
+      params({ ontologyId: ONTOLOGY })
+    );
+    expect((await body<{ limit: number }>(claimResponse)).limit).toBe(100);
+
+    const defaultEvents = await events(
+      request(`/api/ontologies/${ONTOLOGY}/events`),
+      params({ ontologyId: ONTOLOGY })
+    );
+    const invalidEvents = await events(
+      request(`/api/ontologies/${ONTOLOGY}/events?limit=-1`),
+      params({ ontologyId: ONTOLOGY })
+    );
+    expect(await body(invalidEvents)).toEqual(await body(defaultEvents));
+  });
+
   it("returns ranked matches with evidence when searching", async () => {
     const response = await listEntities(
       request(`/api/ontologies/${ONTOLOGY}/entities?q=Avery`),

apps/logicsrc-web/src/app/api/ontologies/[ontologyId]/claims/route.ts

@@ -1,4 +1,5 @@
 import { handle, apiJson } from "@/lib/ontology-service";
+import { parseBoundedIntegerParam } from "@/lib/pagination";
 
 export const dynamic = "force-dynamic";
 
@@ -6,7 +7,7 @@ export async function GET(request: Request, { params }: { params: Promise<{ onto
   const { ontologyId } = await params;
   const url = new URL(request.url);
   const statusParam = url.searchParams.get("status") ?? "asserted";
-  const limit = Math.min(Number(url.searchParams.get("limit") ?? 100), 500);
+  const limit = parseBoundedIntegerParam(url.searchParams.get("limit"), 100, 1, 500);
 
   return handle(request, ontologyId, (engine) => {
     const claims = engine.store.listClaims({

apps/logicsrc-web/src/app/api/ontologies/[ontologyId]/entities/route.ts

@@ -1,4 +1,5 @@
 import { handle, apiJson } from "@/lib/ontology-service";
+import { parseBoundedIntegerParam } from "@/lib/pagination";
 
 export const dynamic = "force-dynamic";
 
@@ -8,8 +9,8 @@ export async function GET(request: Request, { params }: { params: Promise<{ onto
   const url = new URL(request.url);
   const type = url.searchParams.get("type") ?? undefined;
   const q = url.searchParams.get("q") ?? undefined;
-  const limit = Math.min(Number(url.searchParams.get("limit") ?? 50), 200);
+  const limit = parseBoundedIntegerParam(url.searchParams.get("limit"), 50, 1, 200);
-  const offset = Math.max(Number(url.searchParams.get("offset") ?? 0), 0);
+  const offset = parseBoundedIntegerParam(url.searchParams.get("offset"), 0, 0, Number.MAX_SAFE_INTEGER);
 
   return handle(request, ontologyId, (engine) => {
     if (q) {

apps/logicsrc-web/src/app/api/ontologies/[ontologyId]/events/route.ts

@@ -1,4 +1,5 @@
 import { getService, apiError, apiJson, engineFor } from "@/lib/ontology-service";
+import { parseBoundedIntegerParam } from "@/lib/pagination";
 
 export const dynamic = "force-dynamic";
 
@@ -27,7 +28,7 @@ export async function GET(request: Request, { params }: { params: Promise<{ onto
   const engine = bound.engine;
 
   if (!wantsStream) {
-    const limit = Math.min(Number(url.searchParams.get("limit") ?? 100), 500);
+    const limit = parseBoundedIntegerParam(url.searchParams.get("limit"), 100, 1, 500);
     return apiJson({ events: engine.listEvents({ limit }) });
   }
 

apps/logicsrc-web/src/lib/pagination.test.ts

@@ -0,0 +1,17 @@
+import { describe, test } from "node:test";
+import assert from "node:assert/strict";
+import { parseBoundedIntegerParam } from "./pagination.ts";
+
+describe("pagination parameters", () => {
+  test("uses the fallback for negative, fractional, and malformed values", () => {
+    for (const value of [null, "-1", "1.5", "invalid", "9007199254740992"]) {
+      assert.equal(parseBoundedIntegerParam(value, 50, 1, 200), 50);
+    }
+  });
+
+  test("accepts valid values and caps the upper bound", () => {
+    assert.equal(parseBoundedIntegerParam(" 1 ", 50, 1, 200), 1);
+    assert.equal(parseBoundedIntegerParam("500", 50, 1, 200), 200);
+    assert.equal(parseBoundedIntegerParam("0", 0, 0, Number.MAX_SAFE_INTEGER), 0);
+  });
+});

apps/logicsrc-web/src/lib/pagination.ts

@@ -0,0 +1,13 @@
+export function parseBoundedIntegerParam(
+  value: string | null,
+  fallback: number,
+  minimum: number,
+  maximum: number
+): number {
+  const text = value?.trim() ?? "";
+  if (!/^\d+$/.test(text)) return fallback;
+
+  const parsed = Number(text);
+  if (!Number.isSafeInteger(parsed) || parsed < minimum) return fallback;
+  return Math.min(parsed, maximum);
+}