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 offset = Math.max(Number(url.searchParams.get("offset") ?? 0), 0);
+  const limit = parseBoundedIntegerParam(url.searchParams.get("limit"), 50, 1, 200);
+  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);
+}

packages/opencontext/src/adapters/http.test.ts

@@ -0,0 +1,33 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { httpAdapter } from "./http.js";
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+});
+
+describe("http adapter response limits", () => {
+  it("enforces the byte limit for multibyte responses without a content-length header", async () => {
+    const content = "é".repeat(3 * 1024 * 1024);
+    vi.stubGlobal("fetch", vi.fn().mockResolvedValue(new Response(content)));
+
+    await expect(
+      httpAdapter.load("https://example.com/context.md", {
+        dir: process.cwd(),
+        offline: false,
+        config: {}
+      })
+    ).rejects.toThrow(/response exceeds the 5242880 byte limit/);
+  });
+
+  it("decodes responses within the byte limit", async () => {
+    vi.stubGlobal("fetch", vi.fn().mockResolvedValue(new Response("café")));
+
+    await expect(
+      httpAdapter.load("https://example.com/context.md", {
+        dir: process.cwd(),
+        offline: false,
+        config: {}
+      })
+    ).resolves.toMatchObject({ content: "café", trust: "untrusted" });
+  });
+});

packages/opencontext/src/adapters/http.ts

@@ -20,6 +20,38 @@ export class OfflineError extends Error {
 const DEFAULT_TIMEOUT_MS = 10_000;
 const MAX_BYTES = 5 * 1024 * 1024;
 
+async function readBody(response: Response, uri: string): Promise<string> {
+  if (!response.body) return "";
+
+  const reader = response.body.getReader();
+  const chunks: Uint8Array[] = [];
+  let totalBytes = 0;
+
+  try {
+    while (true) {
+      const { done, value } = await reader.read();
+      if (done) break;
+
+      totalBytes += value.byteLength;
+      if (totalBytes > MAX_BYTES) {
+        await reader.cancel().catch(() => undefined);
+        throw new Error(`Refusing to load ${uri}: response exceeds the ${MAX_BYTES} byte limit.`);
+      }
+      chunks.push(value);
+    }
+  } finally {
+    reader.releaseLock();
+  }
+
+  const bytes = new Uint8Array(totalBytes);
+  let offset = 0;
+  for (const chunk of chunks) {
+    bytes.set(chunk, offset);
+    offset += chunk.byteLength;
+  }
+  return new TextDecoder().decode(bytes);
+}
+
 export const httpAdapter: Adapter = {
   name: "http",
   schemes: ["http", "https"],
@@ -39,6 +71,7 @@ export const httpAdapter: Adapter = {
     const controller = new AbortController();
     const timer = setTimeout(() => controller.abort(), timeoutMs);
 
+    try {
       let response: Response;
       try {
         response = await fetch(url, {
@@ -50,8 +83,6 @@ export const httpAdapter: Adapter = {
         });
       } catch (error) {
         throw new Error(`Failed to fetch ${uri}: ${(error as Error).message}`);
-    } finally {
-      clearTimeout(timer);
       }
 
       if (!response.ok) {
@@ -63,10 +94,7 @@ export const httpAdapter: Adapter = {
         throw new Error(`Refusing to load ${uri}: ${declaredLength} bytes exceeds the ${MAX_BYTES} byte limit.`);
       }
 
-    const content = await response.text();
-    if (content.length > MAX_BYTES) {
-      throw new Error(`Refusing to load ${uri}: response exceeds the ${MAX_BYTES} byte limit.`);
-    }
+      const content = await readBody(response, uri);
 
       return {
         content,
@@ -75,5 +103,8 @@ export const httpAdapter: Adapter = {
         retrievedAt: new Date().toISOString(),
         trust: (ctx.config.trust as AdapterResult["trust"]) ?? "untrusted"
       };
+    } finally {
+      clearTimeout(timer);
+    }
   }
 };