Checkpoint web parity through Chromium input tasks

web/tests/e2e/glb-negative-cases.spec.ts

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+import fs from "node:fs";
+import path from "node:path";
+import { expect, test } from "@playwright/test";
+
+const root = path.resolve(import.meta.dirname, "../../..");
+const source = fs.readFileSync(path.join(root, "tests/files/web/m12_glb_desktop_v1/mesh.glb"));
+const maxBytes = 512 * 1024;
+
+function rewriteJson(mutator: (document: any) => void): Buffer {
+  const jsonLength = source.readUInt32LE(12);
+  const document = JSON.parse(source.subarray(20, 20 + jsonLength).toString("utf8").trim());
+  mutator(document);
+  const json = Buffer.from(JSON.stringify(document));
+  const paddedLength = (json.length + 3) & ~3;
+  const output = Buffer.alloc(12 + 8 + paddedLength + (source.length - (20 + jsonLength)));
+  output.writeUInt32LE(0x46546c67, 0); output.writeUInt32LE(2, 4); output.writeUInt32LE(output.length, 8);
+  output.writeUInt32LE(paddedLength, 12); output.writeUInt32LE(0x4e4f534a, 16); json.copy(output, 20);
+  output.fill(0x20, 20 + json.length, 20 + paddedLength);
+  output.writeUInt32LE(source.readUInt32LE(20 + jsonLength), 20 + paddedLength);
+  output.writeUInt32LE(source.readUInt32LE(24 + jsonLength), 24 + paddedLength);
+  source.subarray(28 + jsonLength).copy(output, 28 + paddedLength);
+  return output;
+}
+
+test("rejects GLB sparse, extension, external URI and over-budget cases in a Chromium Worker", async ({ page }) => {
+  await page.goto("/");
+  const cases = [
+    { id: "sparse", bytes: rewriteJson((document) => { document.accessors[0].sparse = { count: 1 }; }) },
+    { id: "extension", bytes: rewriteJson((document) => { document.extensionsUsed = ["KHR_draco_mesh_compression"]; }) },
+    { id: "external-uri", bytes: rewriteJson((document) => { document.buffers[0].uri = "external.bin"; }) },
+    { id: "over-budget", bytes: Buffer.concat([source, Buffer.alloc(maxBytes + 1 - source.length)]) },
+  ].map((candidate) => ({ id: candidate.id, bytes: Array.from(candidate.bytes) }));
+  const result = await page.evaluate((input) => new Promise<{ ok: boolean; results?: Array<{ id: string; code: string }>; error?: string }>((resolve, reject) => {
+    const worker = new Worker("/src/workers/glb-negative-cases-test.worker.ts", { type: "module" });
+    worker.onmessage = (event: MessageEvent<{ ok: boolean; results?: Array<{ id: string; code: string }>; error?: string }>) => { worker.terminate(); resolve(event.data); };
+    worker.onerror = (event) => { worker.terminate(); reject(new Error(event.message)); };
+    const cases = input.map((candidate) => ({ id: candidate.id, bytes: Uint8Array.from(candidate.bytes).buffer }));
+    worker.postMessage({ cases }, cases.map((candidate) => candidate.bytes));
+  }), cases);
+  expect(result).toEqual({ ok: true, results: [
+    { id: "sparse", code: "GLB_SPARSE_ACCESSOR_UNSUPPORTED" },
+    { id: "extension", code: "GLB_EXTENSION_UNSUPPORTED" },
+    { id: "external-uri", code: "GLB_EXTERNAL_URI_BLOCKED" },
+    { id: "over-budget", code: "GLB_IMPORT_BUDGET_EXCEEDED" },
+  ] });
+});