fix: inspect uploaded image dimensions on the server

apps/api/tests/application/image-inspection.test.js

@@ -0,0 +1,46 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import sharp from 'sharp';
+import { createSharpImageInspector } from '../../src/infrastructure/images/sharp-image-inspector.js';
+import { createInventoryImageService } from '../../src/modules/inventory/services/inventory-image-service.js';
+
+function createService() {
+  const writes = [];
+  return { writes, service: createInventoryImageService({
+    imageInspector: createSharpImageInspector(),
+    imageStorage: { async put(input) { writes.push(input); }, async delete() {} },
+    inventoryImageRepository: { async createForSeller(input) { return { id: 'image-1', ...input }; } },
+  }) };
+}
+const metadata = { inventoryItemId: 'item-1', sellerId: 'seller-1', storageKey: 'test', originalFilename: 'test.png', width: 9999, height: 9999, fileSize: 1 };
+
+test('inspects JPEG, PNG and WebP bytes and stores their true dimensions and size', async () => {
+  for (const [format, mimeType] of [['jpeg', 'image/jpeg'], ['png', 'image/png'], ['webp', 'image/webp']]) {
+    const data = await sharp({ create: { width: 12, height: 8, channels: 3, background: '#123456' } }).toFormat(format).toBuffer();
+    const { service, writes } = createService();
+    const image = await service.upload({ ...metadata, data, mimeType });
+    assert.equal(image.width, 12);
+    assert.equal(image.height, 8);
+    assert.equal(image.fileSize, data.length);
+    assert.equal(writes.length, 1);
+  }
+});
+
+test('rejects actual oversized dimensions, signature-only and truncated images before storage', async () => {
+  const oversized = await sharp({ create: { width: 10001, height: 1, channels: 3, background: 'white' } }).png().toBuffer();
+  const valid = await sharp({ create: { width: 12, height: 8, channels: 3, background: 'white' } }).png().toBuffer();
+  const incompletePixels = valid.subarray(0, valid.length - 15);
+  assert.equal((await createSharpImageInspector().readMetadata(incompletePixels)).width, 12);
+  for (const [data, code] of [[incompletePixels, 'IMAGE_DECODE_INVALID'], [oversized, 'IMAGE_DIMENSIONS_INVALID'], [Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]), 'IMAGE_DECODE_INVALID'], [valid.subarray(0, 40), 'IMAGE_DECODE_INVALID']]) {
+    const { service, writes } = createService();
+    await assert.rejects(() => service.upload({ ...metadata, width: 1, height: 1, data, mimeType: 'image/png' }), { code });
+    assert.deepEqual(writes, []);
+  }
+});
+
+test('checks true byte length before image inspection', async () => {
+  const data = Buffer.alloc(10 * 1024 * 1024 + 1);
+  Buffer.from([0xff, 0xd8, 0xff]).copy(data);
+  const service = createInventoryImageService({ imageInspector: { async readMetadata() { assert.fail('oversized input decoded'); } } });
+  await assert.rejects(() => service.upload({ ...metadata, data, mimeType: 'image/jpeg' }), { code: 'IMAGE_FILE_TOO_LARGE' });
+});