fix(uploads): hash files without WebAssembly under strict CSP

apps/web/e2e/uploads-csp.spec.ts

@@ -1,4 +1,5 @@
 import { readFileSync } from 'node:fs';
+import { createHash } from 'node:crypto';
 import { expect, test } from '@playwright/test';
 
 const nginxHeaders = readFileSync(new URL('../../../deploy/nginx/security-headers.conf', import.meta.url), 'utf8');
@@ -20,6 +21,10 @@ for (const [platform, policy] of Object.entries(policies)) {
         await route.fulfill({ contentType: 'application/javascript', body: `
           try { new Function('return 1')(); document.documentElement.dataset.evalBlocked = 'false'; }
           catch { document.documentElement.dataset.evalBlocked = 'true'; }
+          WebAssembly.compile(new Uint8Array([0, 97, 115, 109, 1, 0, 0, 0])).then(
+            () => { document.documentElement.dataset.wasmBlocked = 'false'; },
+            () => { document.documentElement.dataset.wasmBlocked = 'true'; },
+          );
         ` });
         return;
       }
@@ -27,22 +32,37 @@ for (const [platform, policy] of Object.entries(policies)) {
       await route.fulfill({ response, headers: { ...response.headers(), 'Content-Security-Policy': policy } });
     });
     await page.goto('/csp-upload-test');
-    const result = await page.evaluate(() => new Promise((resolve, reject) => {
+    const result = await page.evaluate(async () => {
       const worker = new Worker('/src/features/uploads/hash.worker.ts', { type: 'module' });
-      worker.onerror = (event) => { worker.terminate(); reject(new Error(event.message)); };
-      worker.onmessage = ({ data }) => {
-        if (data.type === 'progress') return;
+      try {
+        const results = [];
+        // Reuse one worker for empty, known-vector and multi-chunk binary files.
+        const binary = Uint8Array.from({ length: (9 << 20) + 17 }, (_, i) => i % 251);
+        for (const [id, bytes] of [['empty', new Uint8Array()], ['abc', new TextEncoder().encode('abc')], ['binary', binary]] as const) {
+          results.push(await new Promise((resolve, reject) => {
+            const progress: number[] = [];
+            worker.onerror = (event) => reject(new Error(event.message));
+            worker.onmessage = ({ data }) => {
+              if (data.type === 'progress') { progress.push(data.done); return; }
+              resolve({ ...data, progress });
+            };
+            worker.postMessage({ id, file: new File([bytes], `${id}.flac`) });
+          }));
+        }
+        return results;
+      } finally {
         worker.terminate();
-        resolve(data);
-      };
-      worker.postMessage({ id: 'csp-test', file: new File(['abc'], 'track.flac') });
-    }));
-    expect(result).toEqual({
-      id: 'csp-test', type: 'done',
-      sha256: 'ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad',
+      }
     });
+    const binary = Uint8Array.from({ length: (9 << 20) + 17 }, (_, i) => i % 251);
+    expect(result).toEqual([
+      { id: 'empty', type: 'done', sha256: createHash('sha256').update('').digest('hex'), progress: [] },
+      { id: 'abc', type: 'done', sha256: createHash('sha256').update('abc').digest('hex'), progress: [] },
+      { id: 'binary', type: 'done', sha256: createHash('sha256').update(binary).digest('hex'), progress: expect.arrayContaining([expect.any(Number)]) },
+    ]);
     // A page script observes CSP; Playwright's evaluate bypasses the eval restriction.
     await page.addScriptTag({ url: '/csp-eval-test.js' });
     await expect(page.locator('html')).toHaveAttribute('data-eval-blocked', 'true');
+    await expect(page.locator('html')).toHaveAttribute('data-wasm-blocked', 'true');
   });
 }