fix: harden gallery downloads and per-gallery auth

backend/__tests__/services/photoResolver.test.js

@@ -0,0 +1,75 @@
+const path = require('path');
+const mockPath = path;
+
+jest.mock('../../src/services/externalMediaService', () => ({
+  resolveExternalPath: jest.fn((event, relPath) => mockPath.join('/mock/external', event.external_path || '', relPath || '')),
+}));
+
+const { resolveExternalPath } = require('../../src/services/externalMediaService');
+const { resolvePhotoFilePath } = require('../../src/services/photoResolver');
+
+describe('resolvePhotoFilePath', () => {
+  const backendRoot = path.resolve(__dirname, '../../');
+  const originalStoragePath = process.env.STORAGE_PATH;
+
+  beforeEach(() => {
+    process.env.STORAGE_PATH = path.join(backendRoot, 'storage');
+  });
+
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  afterAll(() => {
+    if (typeof originalStoragePath === 'string') {
+      process.env.STORAGE_PATH = originalStoragePath;
+    } else {
+      delete process.env.STORAGE_PATH;
+    }
+  });
+
+  it('returns absolute path for managed photos with legacy slug paths', () => {
+    const event = { slug: 'wedding-party', source_mode: 'managed' };
+    const photo = { path: 'wedding-party/hero.jpg' };
+
+    const result = resolvePhotoFilePath(event, photo);
+
+    expect(result).toBe(path.join(backendRoot, 'storage', 'events/active', 'wedding-party', 'hero.jpg'));
+  });
+
+  it('normalizes prefixed managed paths without duplicating segments', () => {
+    const event = { slug: 'wedding-party', source_mode: 'managed' };
+    const photo = { path: 'events/active/wedding-party/hero.jpg' };
+
+    const result = resolvePhotoFilePath(event, photo);
+
+    expect(result).toBe(path.join(backendRoot, 'storage', 'events/active', 'wedding-party', 'hero.jpg'));
+  });
+
+  it('delegates external photos to external media resolver', () => {
+    const event = { slug: 'fashion-show', source_mode: 'reference', external_path: 'picsum-demo' };
+    const photo = { source_origin: 'external', external_relpath: 'individual/look-01.jpg' };
+
+    const result = resolvePhotoFilePath(event, photo);
+
+    expect(resolveExternalPath).toHaveBeenCalledWith(event, 'individual/look-01.jpg');
+    expect(result).toBe(path.join('/mock/external', 'picsum-demo', 'individual', 'look-01.jpg'));
+  });
+
+  it('deduplicates folder names when event external path already ends with segment', () => {
+    const event = { slug: 'fashion-show', source_mode: 'reference', external_path: 'picsum-demo/individual' };
+    const photo = { source_origin: 'external', external_relpath: 'individual/look-02.jpg' };
+
+    const result = resolvePhotoFilePath(event, photo);
+
+    expect(resolveExternalPath).toHaveBeenCalledWith(event, 'look-02.jpg');
+    expect(result).toBe(path.join('/mock/external', 'picsum-demo/individual', 'look-02.jpg'));
+  });
+
+  it('throws when external photo is missing relative path data', () => {
+    const event = { slug: 'fashion-show', source_mode: 'reference', external_path: 'picsum-demo' };
+    const photo = { source_origin: 'external' };
+
+    expect(() => resolvePhotoFilePath(event, photo)).toThrow('Missing external_relpath for external photo');
+  });
+});