接入移动壳图片导入能力

Expo 壳通过系统相册选择器实现 file.importImage 限制导入图片 MIME 与大小并避免暴露设备本地 URI H5 facade 将用户取消导入归为无选择回退更新移动壳依赖、配置校验、测试和架构文档
2026-06-18 03:04:21 +08:00
parent 199f02cf9f
commit 14f838c414
12 changed files with 348 additions and 7 deletions
--- a/apps/mobile-shell/app.json
+++ b/apps/mobile-shell/app.json
@@ -10,6 +10,16 @@
    "assetBundlePatterns": [
      "**/*"
    ],
+    "plugins": [
+      [
+        "expo-image-picker",
+        {
+          "photosPermission": "允许 Genarrative 读取你选择的图片，用于导入创作素材和参考图。",
+          "cameraPermission": false,
+          "microphonePermission": false
+        }
+      ]
+    ],
    "ios": {
      "supportsTablet": true,
      "associatedDomains": [
--- a/apps/mobile-shell/package.json
+++ b/apps/mobile-shell/package.json
@@ -17,6 +17,7 @@
    "expo-clipboard": "^56.0.4",
    "expo-file-system": "^56.0.8",
    "expo-haptics": "^56.0.3",
+    "expo-image-picker": "^56.0.18",
    "expo-linking": "^56.0.14",
    "expo-network": "^56.0.5",
    "expo-sharing": "^56.0.18",
--- a/apps/mobile-shell/scripts/check-config.mjs
+++ b/apps/mobile-shell/scripts/check-config.mjs
@@ -129,18 +129,46 @@ for (const snippet of [
  }
 }

-for (const dependency of ['expo-file-system', 'expo-network', 'expo-sharing']) {
+for (const dependency of [
+  'expo-file-system',
+  'expo-image-picker',
+  'expo-network',
+  'expo-sharing',
+]) {
  if (!packageConfig.dependencies?.[dependency]) {
    throw new Error(`mobile shell package missing ${dependency}`);
  }
 }

+const imagePickerPlugin = appConfig.plugins?.find((plugin) =>
+  Array.isArray(plugin) ? plugin[0] === 'expo-image-picker' : plugin === 'expo-image-picker',
+);
+if (!imagePickerPlugin) {
+  throw new Error('mobile shell image picker plugin is missing');
+}
+
+if (Array.isArray(imagePickerPlugin)) {
+  const pluginOptions = imagePickerPlugin[1] ?? {};
+  if (typeof pluginOptions.photosPermission !== 'string') {
+    throw new Error('mobile shell image picker photo permission text is missing');
+  }
+  if (
+    pluginOptions.cameraPermission !== false ||
+    pluginOptions.microphonePermission !== false
+  ) {
+    throw new Error('mobile shell image picker must not request camera or microphone');
+  }
+}
+
 for (const snippet of [
  'file.exportText',
  'file.exportImage',
+  'file.importImage',
  'network.status',
  'getMobileNetworkStatus',
  'Sharing.shareAsync',
+  'ImagePicker.launchImageLibraryAsync',
+  'ImagePicker.requestMediaLibraryPermissionsAsync',
  'normalizeHostBridgeExportFileName',
  'base64Data',
 ]) {
@@ -172,6 +200,7 @@ for (const capability of [
  'clipboard.writeText',
  'file.exportText',
  'file.exportImage',
+  'file.importImage',
  'haptics.impact',
 ]) {
  if (!mobileCapabilitySet.has(capability)) {
--- a/apps/mobile-shell/src/mobileHostBridge.test.ts
+++ b/apps/mobile-shell/src/mobileHostBridge.test.ts
@@ -1,4 +1,5 @@
 import * as Haptics from 'expo-haptics';
+import * as ImagePicker from 'expo-image-picker';
 import * as Linking from 'expo-linking';
 import * as Network from 'expo-network';
 import * as Sharing from 'expo-sharing';
@@ -66,6 +67,15 @@ vi.mock('expo-haptics', () => ({
  impactAsync: vi.fn(),
 }));

+vi.mock('expo-image-picker', () => ({
+  PermissionStatus: {
+    DENIED: 'denied',
+    GRANTED: 'granted',
+  },
+  launchImageLibraryAsync: vi.fn(),
+  requestMediaLibraryPermissionsAsync: vi.fn(),
+}));
+
 vi.mock('expo-linking', () => ({
  openURL: vi.fn(),
 }));
@@ -156,6 +166,18 @@ afterEach(() => {
  vi.mocked(Appearance.getColorScheme).mockReset();
  vi.mocked(Appearance.getColorScheme).mockReturnValue('light');
  vi.mocked(Haptics.impactAsync).mockReset();
+  vi.mocked(ImagePicker.launchImageLibraryAsync).mockReset();
+  vi.mocked(ImagePicker.launchImageLibraryAsync).mockResolvedValue({
+    canceled: true,
+    assets: null,
+  });
+  vi.mocked(ImagePicker.requestMediaLibraryPermissionsAsync).mockReset();
+  vi.mocked(ImagePicker.requestMediaLibraryPermissionsAsync).mockResolvedValue({
+    status: ImagePicker.PermissionStatus.GRANTED,
+    granted: true,
+    canAskAgain: true,
+    expires: 'never',
+  });
  vi.mocked(Linking.openURL).mockReset();
  vi.mocked(Network.getNetworkStateAsync).mockReset();
  vi.mocked(Network.getNetworkStateAsync).mockResolvedValue({
@@ -189,6 +211,9 @@ describe('handleMobileHostBridgeMessage', () => {
    expect(
      (okResponse.result as { capabilities: string[] }).capabilities,
    ).toContain('file.exportText');
+    expect(
+      (okResponse.result as { capabilities: string[] }).capabilities,
+    ).toContain('file.importImage');
    expect(
      (okResponse.result as { capabilities: string[] }).capabilities,
    ).toEqual(
@@ -550,4 +575,117 @@ describe('handleMobileHostBridgeMessage', () => {
    expect(writtenFiles).toEqual([]);
    expect(Sharing.shareAsync).not.toHaveBeenCalled();
  });
+
+  test('file.importImage 调起系统相册并返回受控图片数据', async () => {
+    vi.mocked(ImagePicker.launchImageLibraryAsync).mockResolvedValue({
+      canceled: false,
+      assets: [
+        {
+          uri: 'file:///private/mobile/参考图.png',
+          width: 120,
+          height: 80,
+          type: 'image',
+          fileName: ' ../参考:图?.png ',
+          fileSize: 5,
+          base64: 'aW1hZ2U=',
+          mimeType: 'image/png',
+        },
+      ],
+    });
+
+    const response = await send(request('file.importImage'));
+
+    expect(expectOk(response).result).toEqual({
+      action: 'selected',
+      fileName: '参考-图-.png',
+      base64Data: 'aW1hZ2U=',
+      mimeType: 'image/png',
+      bytes: 5,
+    });
+    expect(ImagePicker.requestMediaLibraryPermissionsAsync).toHaveBeenCalled();
+    expect(ImagePicker.launchImageLibraryAsync).toHaveBeenCalledWith({
+      allowsEditing: false,
+      allowsMultipleSelection: false,
+      base64: true,
+      exif: false,
+      mediaTypes: ['images'],
+      quality: 1,
+    });
+  });
+
+  test('file.importImage 取消选择时返回 cancelled', async () => {
+    vi.mocked(ImagePicker.launchImageLibraryAsync).mockResolvedValue({
+      canceled: true,
+      assets: null,
+    });
+
+    const response = await send(request('file.importImage'));
+
+    const failedResponse = expectFailed(response);
+    expect(failedResponse.error.code).toBe('cancelled');
+  });
+
+  test('file.importImage 拒绝权限、非法 MIME 和超限图片', async () => {
+    vi.mocked(ImagePicker.requestMediaLibraryPermissionsAsync).mockResolvedValue(
+      {
+        status: ImagePicker.PermissionStatus.DENIED,
+        granted: false,
+        canAskAgain: false,
+        expires: 'never',
+      },
+    );
+
+    const denied = await send(request('file.importImage'));
+
+    expect(expectFailed(denied).error.code).toBe('host_error');
+    expect(ImagePicker.launchImageLibraryAsync).not.toHaveBeenCalled();
+
+    vi.mocked(ImagePicker.requestMediaLibraryPermissionsAsync).mockResolvedValue(
+      {
+        status: ImagePicker.PermissionStatus.GRANTED,
+        granted: true,
+        canAskAgain: true,
+        expires: 'never',
+      },
+    );
+    vi.mocked(ImagePicker.launchImageLibraryAsync).mockResolvedValue({
+      canceled: false,
+      assets: [
+        {
+          uri: 'file:///private/mobile/参考图.gif',
+          width: 120,
+          height: 80,
+          type: 'image',
+          fileName: '参考图.gif',
+          fileSize: 5,
+          base64: 'aW1hZ2U=',
+          mimeType: 'image/gif',
+        },
+      ],
+    });
+
+    const unsupportedMime = await send(request('file.importImage'));
+
+    expect(expectFailed(unsupportedMime).error.code).toBe('invalid_request');
+
+    vi.mocked(ImagePicker.launchImageLibraryAsync).mockResolvedValue({
+      canceled: false,
+      assets: [
+        {
+          uri: 'file:///private/mobile/参考图.png',
+          width: 120,
+          height: 80,
+          type: 'image',
+          fileName: '参考图.png',
+          fileSize: 10 * 1024 * 1024 + 1,
+          base64: 'aW1hZ2U=',
+          mimeType: 'image/png',
+        },
+      ],
+    });
+
+    const oversized = await send(request('file.importImage'));
+
+    expect(expectFailed(oversized).error.code).toBe('invalid_request');
+  });
 });
--- a/apps/mobile-shell/src/mobileHostBridge.ts
+++ b/apps/mobile-shell/src/mobileHostBridge.ts
@@ -1,6 +1,7 @@
 import * as Clipboard from 'expo-clipboard';
 import { File, Paths } from 'expo-file-system';
 import * as Haptics from 'expo-haptics';
+import * as ImagePicker from 'expo-image-picker';
 import * as Linking from 'expo-linking';
 import * as Sharing from 'expo-sharing';
 import {
@@ -16,11 +17,13 @@ import {
  type FileExportImageResult,
  type FileExportTextPayload,
  type FileExportTextResult,
+  type FileImportImageResult,
  type HapticsImpactPayload,
  HOST_BRIDGE_PROTOCOL,
  HOST_BRIDGE_VERSION,
  type HostBridgeCapability,
  type HostBridgeError,
+  type HostBridgeImageMimeType,
  type HostBridgeMethod,
  type HostBridgeRequest,
  type HostBridgeResponse,
@@ -39,7 +42,8 @@ import { getMobileNetworkStatus } from './mobileShellNetwork';
 const WEB_APP_ORIGIN = 'https://app.genarrative.world';
 const EXPORT_TEXT_MAX_BYTES = 5 * 1024 * 1024;
 const EXPORT_IMAGE_MAX_BYTES = 5 * 1024 * 1024;
-const EXPORT_IMAGE_MIME_TYPES = new Set([
+const IMPORT_IMAGE_MAX_BYTES = 10 * 1024 * 1024;
+const HOST_BRIDGE_IMAGE_MIME_TYPES = new Set<HostBridgeImageMimeType>([
  'image/png',
  'image/jpeg',
  'image/webp',
@@ -60,6 +64,7 @@ export const MOBILE_HOST_CAPABILITIES: HostBridgeCapability[] = [
  'clipboard.writeText',
  'file.exportText',
  'file.exportImage',
+  'file.importImage',
  'haptics.impact',
 ];

@@ -251,7 +256,10 @@ async function exportTextFile(payload: unknown): Promise<FileExportTextResult> {
 async function exportImageFile(payload: unknown): Promise<FileExportImageResult> {
  const exportPayload = payload as FileExportImagePayload | undefined;
  const mimeType = exportPayload?.mimeType;
-  if (typeof mimeType !== 'string' || !EXPORT_IMAGE_MIME_TYPES.has(mimeType)) {
+  if (
+    typeof mimeType !== 'string' ||
+    !HOST_BRIDGE_IMAGE_MIME_TYPES.has(mimeType as HostBridgeImageMimeType)
+  ) {
    throw invalidRequest('mimeType must be an allowed image type');
  }

@@ -288,6 +296,90 @@ async function exportImageFile(payload: unknown): Promise<FileExportImageResult>
  };
 }

+function normalizeImportedImageMimeType(
+  value: unknown,
+): HostBridgeImageMimeType | null {
+  if (typeof value !== 'string') {
+    return null;
+  }
+
+  const mimeType = value.toLowerCase();
+  return HOST_BRIDGE_IMAGE_MIME_TYPES.has(mimeType as HostBridgeImageMimeType)
+    ? (mimeType as HostBridgeImageMimeType)
+    : null;
+}
+
+function fallbackImportedImageFileName(mimeType: HostBridgeImageMimeType) {
+  if (mimeType === 'image/jpeg') {
+    return 'genarrative-import.jpg';
+  }
+  if (mimeType === 'image/webp') {
+    return 'genarrative-import.webp';
+  }
+  return 'genarrative-import.png';
+}
+
+async function importImageFile(): Promise<FileImportImageResult> {
+  const permission = await ImagePicker.requestMediaLibraryPermissionsAsync();
+  if (permission.status !== ImagePicker.PermissionStatus.GRANTED) {
+    throw {
+      code: 'host_error',
+      message: 'photo library permission denied',
+    } satisfies HostBridgeError;
+  }
+
+  const result = await ImagePicker.launchImageLibraryAsync({
+    allowsEditing: false,
+    allowsMultipleSelection: false,
+    base64: true,
+    exif: false,
+    mediaTypes: ['images'],
+    quality: 1,
+  });
+  if (result.canceled) {
+    throw {
+      code: 'cancelled',
+      message: 'file import cancelled',
+    } satisfies HostBridgeError;
+  }
+
+  const asset = result.assets[0];
+  if (!asset || asset.type !== 'image') {
+    throw invalidRequest('image asset is required');
+  }
+
+  const mimeType = normalizeImportedImageMimeType(asset.mimeType);
+  if (!mimeType) {
+    throw invalidRequest('mimeType must be an allowed image type');
+  }
+
+  const base64Data = normalizedBase64Data(asset.base64);
+  if (!base64Data) {
+    throw invalidRequest('base64Data is required');
+  }
+
+  const bytes = base64DecodedByteLength(base64Data);
+  if (bytes <= 0 || bytes > IMPORT_IMAGE_MAX_BYTES) {
+    throw invalidRequest('image exceeds file import size limit');
+  }
+  if (
+    typeof asset.fileSize === 'number' &&
+    asset.fileSize > IMPORT_IMAGE_MAX_BYTES
+  ) {
+    throw invalidRequest('image exceeds file import size limit');
+  }
+
+  return {
+    action: 'selected',
+    fileName: normalizeHostBridgeExportFileName(
+      asset.fileName || fallbackImportedImageFileName(mimeType),
+    ),
+    base64Data,
+    mimeType,
+    bytes,
+  };
+}
+
 async function runHaptics(payload: unknown) {
  const style = (payload as HapticsImpactPayload | undefined)?.style;
  const impactStyle =
@@ -448,6 +540,8 @@ async function handleRequest(request: HostBridgeRequest) {
      return ok(request, await exportTextFile(request.payload));
    case 'file.exportImage':
      return ok(request, await exportImageFile(request.payload));
+    case 'file.importImage':
+      return ok(request, await importImageFile());
    case 'haptics.impact':
      return ok(request, await runHaptics(request.payload));
    case 'app.setBadgeCount':
--- a/docs/project-memory/shared-memory/decision-log.md
+++ b/docs/project-memory/shared-memory/decision-log.md
@@ -33,6 +33,7 @@
 - 2026-06-18 原生壳生命周期事件：新增 `app.lifecycle` HostBridge capability，Expo 壳通过 React Native `AppState` 派发 `active` / `inactive` / `background`，Tauri 壳通过主窗口 focus / blur 派发 `active` / `inactive`；H5 只通过 `subscribeHostAppLifecycle()` 订阅统一状态，后续游戏循环、音频和轮询暂停 / 恢复不得直接依赖 Expo / Tauri 平台细节。
 - 2026-06-18 原生壳网络状态：新增 `network.status` 与 `network.statusChanged` HostBridge capability，Expo 壳通过 `expo-network` 查询和订阅真实系统网络状态，Tauri 壳通过短超时连接 `app.genarrative.world:443` 查询主站可达性，并通过 WebView `online` / `offline` 注入变化事件；H5 统一使用 `getHostNetworkStatus()` / `subscribeHostNetworkStatusChange()`，不得直接读取 Expo / Tauri 私有网络 API。
 - 2026-06-18 桌面图片导入：新增 `file.importImage` 与 `file.imageDropped` HostBridge capability，Tauri 壳通过系统文件选择框和主窗口拖拽事件读取用户选择 / 拖入的真实图片，只允许 `image/png`、`image/jpeg`、`image/webp` 且单次不超过 10 MiB；H5 统一使用 `importHostImageFile()` / `subscribeHostImageDrop()`，宿主只回传文件名、MIME、base64 内容、字节数和可选坐标，不暴露本地绝对路径，也不开放通用文件系统。
+- 2026-06-18 移动图片导入：Expo 壳开始声明并实现 `file.importImage`，通过 `expo-image-picker` 请求相册权限并打开系统相册选择器，只允许 `image/png`、`image/jpeg`、`image/webp` 且单次不超过 10 MiB；成功只回传清洗后的文件名、MIME、base64 内容和字节数，不暴露设备本地 URI，不请求相机或麦克风权限，用户取消返回 `cancelled` 并由 H5 facade 归为 `false`。
 - 影响范围：`src/services/host-bridge/`、未来 `apps/mobile-shell/`、未来 `apps/desktop-shell/`、移动端支付 / 分享 / 深链 / 推送、桌面端系统能力、AI H5 sandbox 的 GameBridge 边界。
 - 验证方式：普通浏览器、小程序、Expo 壳、Tauri 壳都能返回正确 `getHostRuntime()`；未支持能力能回退 H5；固定玩法在各宿主中读取同一作品数据和运行态 snapshot；AI sandbox 无法直接调用 HostBridge；Tauri release 不允许任意远端页面调用桌面命令。
 - 关联文档：`docs/【前端架构】ExpoReactNative与Tauri宿主壳方案-2026-06-17.md`、`docs/【前端架构】宿主壳能力统一协议-2026-06-17.md`。
--- a/docs/【前端架构】ExpoReactNative与Tauri宿主壳方案-2026-06-17.md
+++ b/docs/【前端架构】ExpoReactNative与Tauri宿主壳方案-2026-06-17.md
@@ -126,7 +126,7 @@ type HostBridgeEvent = {
 | `network.statusChanged` | 通知 H5 网络状态变化 | 支持 Expo Network 事件 | 支持 WebView online / offline 事件 |
 | `clipboard.writeText` | 写剪贴板 | 支持 | 支持 |
 | `file.exportText` | 导出文本到用户选择的本地文件 | 支持系统分享 / 保存面板 | 支持系统保存对话框 |
-| `file.importImage` | 导入用户选择的图片文件 | 不声明 | 支持系统选择图片 |
+| `file.importImage` | 导入用户选择的图片文件 | 支持系统相册选择图片 | 支持系统选择图片 |
 | `file.imageDropped` | 通知 H5 桌面拖入图片 | 不声明 | 支持主窗口拖拽图片事件 |
 | `haptics.impact` | 轻量触感反馈 | 支持 | 不声明 |

@@ -249,7 +249,7 @@ GameBridge 禁止：
 - iOS / Android 深链打开作品详情、创作页和邀请码。
 - 登录和支付先 fallback 到 H5；只把能力边界跑通。

-当前状态：已新增 `apps/mobile-shell/`，通过 Expo development build 运行，`react-native-webview` 加载 H5 URL 并附加 `native_app` 宿主 query。移动壳使用真实品牌图标资产，已接入 `genarrative://` scheme、iOS associated domain 和 Android app link filter，启动和运行时 deep link 只会映射到同源 H5 路径并继续附加 HostBridge 上下文，外域和危险协议回退到默认主站入口。首轮真实能力包括 `host.getRuntime`、`appearance.getColorScheme`、`host.events`、`app.lifecycle`、`network.status`、`network.statusChanged`、`share.open`、`share.setTarget`、`navigation.openNativePage`、`navigation.canGoBack`、`app.openExternalUrl`、`clipboard.writeText`、`file.exportText`、`file.exportImage`、`haptics.impact` 和 Android 返回键回退；其中 `appearance.getColorScheme` 只读系统配色偏好，不强改 H5 或系统主题；`app.lifecycle` 通过 React Native `AppState` 注入 `active` / `inactive` / `background` 统一状态，供 H5 游戏循环、音频和轮询做真实暂停 / 恢复判断；`network.status` / `network.statusChanged` 通过 `expo-network` 查询并订阅真实系统网络状态，供 H5 游戏运行态和生成页识别离线 / 弱网回退；iOS 额外声明 `app.setBadgeCount`，通过 React Native `PushNotificationIOS` 设置应用图标角标，Android 不声明该能力。H5 会解析并过滤 `hostCapabilities`，也会在主 App 启动时通过真实 `host.getRuntime` 回读并缓存能力，只对声明或回读到的能力展示入口或调用宿主能力；其中 `share.setTarget` / `share.open` 会解析统一分享目标里的 `title`、`message`、`url`、`work`、`path` 或 `targetPath` 并调用 React Native 系统分享面板；发布分享弹窗只有在宿主声明 `share.open` 时才提供“系统分享”动作，失败时保留复制链接回退路径；`navigation.openNativePage` 在 Expo 壳内只接受同源 H5 route 并切换 WebView URL，不伪造尚未存在的登录、支付或其它原生页面，`navigation.canGoBack` 由 WebView 导航状态变化实时注入 H5，WebView 自身拦截到外域导航时只会把 `http:`、`https:`、`mailto:`、`tel:` 交给系统，危险协议直接阻断；`app.openExternalUrl` 也只允许同一协议白名单，ICP备案号和资产调试原图等 H5 外链入口在 `native_app` 中优先通过该能力离开 WebView 并交给系统浏览器；`clipboard.writeText` 由 H5 复制服务优先调用并写入系统剪贴板；`file.exportText` 通过 Expo 文件系统写入缓存文本文件，再交给系统分享 / 保存面板，文件名必须清洗，单次文本不超过 5 MiB，成功只返回文件名和字节数；`file.exportImage` 通过 Expo 文件系统写入缓存图片，再交给系统分享 / 保存面板，H5 只传允许 MIME 的 base64 图片数据，单次不超过 5 MiB，分享卡下载会优先走该能力；`haptics.impact` 通过 Expo Haptics 承接运行时轻触反馈，H5 在宿主不支持时回退到浏览器 vibration。登录和支付尚未接入渠道 SDK / 原生页面时明确返回 unsupported，让 H5 fallback 承接。
+当前状态：已新增 `apps/mobile-shell/`，通过 Expo development build 运行，`react-native-webview` 加载 H5 URL 并附加 `native_app` 宿主 query。移动壳使用真实品牌图标资产，已接入 `genarrative://` scheme、iOS associated domain 和 Android app link filter，启动和运行时 deep link 只会映射到同源 H5 路径并继续附加 HostBridge 上下文，外域和危险协议回退到默认主站入口。首轮真实能力包括 `host.getRuntime`、`appearance.getColorScheme`、`host.events`、`app.lifecycle`、`network.status`、`network.statusChanged`、`share.open`、`share.setTarget`、`navigation.openNativePage`、`navigation.canGoBack`、`app.openExternalUrl`、`clipboard.writeText`、`file.exportText`、`file.exportImage`、`file.importImage`、`haptics.impact` 和 Android 返回键回退；其中 `appearance.getColorScheme` 只读系统配色偏好，不强改 H5 或系统主题；`app.lifecycle` 通过 React Native `AppState` 注入 `active` / `inactive` / `background` 统一状态，供 H5 游戏循环、音频和轮询做真实暂停 / 恢复判断；`network.status` / `network.statusChanged` 通过 `expo-network` 查询并订阅真实系统网络状态，供 H5 游戏运行态和生成页识别离线 / 弱网回退；iOS 额外声明 `app.setBadgeCount`，通过 React Native `PushNotificationIOS` 设置应用图标角标，Android 不声明该能力。H5 会解析并过滤 `hostCapabilities`，也会在主 App 启动时通过真实 `host.getRuntime` 回读并缓存能力，只对声明或回读到的能力展示入口或调用宿主能力；其中 `share.setTarget` / `share.open` 会解析统一分享目标里的 `title`、`message`、`url`、`work`、`path` 或 `targetPath` 并调用 React Native 系统分享面板；发布分享弹窗只有在宿主声明 `share.open` 时才提供“系统分享”动作，失败时保留复制链接回退路径；`navigation.openNativePage` 在 Expo 壳内只接受同源 H5 route 并切换 WebView URL，不伪造尚未存在的登录、支付或其它原生页面，`navigation.canGoBack` 由 WebView 导航状态变化实时注入 H5，WebView 自身拦截到外域导航时只会把 `http:`、`https:`、`mailto:`、`tel:` 交给系统，危险协议直接阻断；`app.openExternalUrl` 也只允许同一协议白名单，ICP备案号和资产调试原图等 H5 外链入口在 `native_app` 中优先通过该能力离开 WebView 并交给系统浏览器；`clipboard.writeText` 由 H5 复制服务优先调用并写入系统剪贴板；`file.exportText` 通过 Expo 文件系统写入缓存文本文件，再交给系统分享 / 保存面板，文件名必须清洗，单次文本不超过 5 MiB，成功只返回文件名和字节数；`file.exportImage` 通过 Expo 文件系统写入缓存图片，再交给系统分享 / 保存面板，H5 只传允许 MIME 的 base64 图片数据，单次不超过 5 MiB，分享卡下载会优先走该能力；`file.importImage` 通过 Expo ImagePicker 请求相册权限并打开系统相册选择器，只接受 `image/png` / `image/jpeg` / `image/webp`、单次不超过 10 MiB，成功只返回清洗后的文件名、MIME、base64 内容和字节数，不把设备本地 URI 暴露给 H5，用户取消返回 `cancelled` 并由 H5 视作无选择；`haptics.impact` 通过 Expo Haptics 承接运行时轻触反馈，H5 在宿主不支持时回退到浏览器 vibration。登录和支付尚未接入渠道 SDK / 原生页面时明确返回 unsupported，让 H5 fallback 承接。

 ### Phase 3：Tauri 桌面壳 MVP

--- a/docs/【前端架构】宿主壳能力统一协议-2026-06-17.md
+++ b/docs/【前端架构】宿主壳能力统一协议-2026-06-17.md
@@ -56,7 +56,7 @@ AI H5 sandbox
 - `navigateHostNativePage()`：受控跳转宿主页，供订阅授权、支付、登录等 adapter 复用。Expo 移动壳首版只接受同源 H5 route 并切换 WebView URL；Tauri 桌面壳同样只接受 `https://app.genarrative.world` 同源 H5 route 并在主窗口内跳转。真正原生页面、登录和支付能力必须等对应 SDK / 页面接入后再声明支持。
 - `exportHostTextFile()`：原生 App 宿主的受控文本导出入口。Expo 移动壳通过 `file.exportText` 写入缓存文本文件并交给系统分享 / 保存面板；Tauri 桌面壳通过 `file.exportText` 打开系统保存对话框并写入用户选择的文件。文件名必须清洗，单次文本不超过 5 MiB，成功只返回文件名和字节数，不把本机绝对路径暴露给 H5；系统分享不可用或用户取消时返回明确错误，由 H5 fallback 承接。
 - `exportHostImageFile()`：原生 App 宿主的受控图片导出入口。H5 只传自己生成的图片 `base64Data`、清洗后的文件名和允许的 `image/png` / `image/jpeg` / `image/webp` MIME；Expo 移动壳写入缓存图片后交给系统分享 / 保存面板，Tauri 桌面壳打开系统保存对话框并写入图片字节。单次图片不超过 5 MiB，成功只返回文件名和字节数，不回传本机绝对路径。当前分享卡下载在 native app 中优先走 `file.exportImage`，宿主未声明时保留浏览器下载路径。
- `importHostImageFile()` / `subscribeHostImageDrop()`：桌面 App 宿主的受控图片导入入口。Tauri 壳通过系统文件选择框或主窗口拖拽事件读取用户选择 / 拖入的图片，只接受 `image/png`、`image/jpeg`、`image/webp`，单次不超过 10 MiB，成功只返回文件名、MIME、base64 内容、字节数和可选拖入坐标，不把本机绝对路径暴露给 H5，也不开放通用文件系统能力；Expo 移动壳未接入真实图片选择器前不声明该能力。
+- `importHostImageFile()` / `subscribeHostImageDrop()`：原生 App 宿主的受控图片导入入口。Expo 移动壳通过 Expo ImagePicker 请求相册权限并打开系统相册选择器，Tauri 壳通过系统文件选择框或主窗口拖拽事件读取用户选择 / 拖入的图片；两端都只接受 `image/png`、`image/jpeg`、`image/webp`，单次不超过 10 MiB，成功只返回文件名、MIME、base64 内容、字节数和可选拖入坐标，不暴露设备本地 URI 或本机绝对路径，也不开放通用文件系统能力。

 ## 迁移顺序

--- a/package-lock.json
+++ b/package-lock.json
@@ -19,6 +19,7 @@
        "expo-clipboard": "^56.0.4",
        "expo-file-system": "^56.0.8",
        "expo-haptics": "^56.0.3",
+        "expo-image-picker": "^56.0.18",
        "expo-linking": "^56.0.14",
        "expo-network": "^56.0.5",
        "expo-sharing": "^56.0.18",
@@ -6388,6 +6389,27 @@
        "expo": "*"
      }
    },
+    "node_modules/expo-image-loader": {
+      "version": "56.0.3",
+      "resolved": "https://registry.npmjs.org/expo-image-loader/-/expo-image-loader-56.0.3.tgz",
+      "integrity": "sha512-JgUo4fUeU1ZC+z8iBFj8v7yoGQnZrLbOVPyNE+DWVrld55F2F6R1ck+rmdm/8TNWLz1LhNQfD7c3XYP1ZikxXA==",
+      "license": "MIT",
+      "peerDependencies": {
+        "expo": "*"
+      }
+    },
+    "node_modules/expo-image-picker": {
+      "version": "56.0.18",
+      "resolved": "https://registry.npmjs.org/expo-image-picker/-/expo-image-picker-56.0.18.tgz",
+      "integrity": "sha512-sCjQ8M27bhGUv2vUavIE+uWdYo79b2D7Q5h9B66BSDZ+Rd8YyLVSf7vYGfIzQ7nMVoENZ6c4xo/JiDkEeQ9iTg==",
+      "license": "MIT",
+      "dependencies": {
+        "expo-image-loader": "~56.0.3"
+      },
+      "peerDependencies": {
+        "expo": "*"
+      }
+    },
    "node_modules/expo-keep-awake": {
      "version": "56.0.3",
      "resolved": "https://registry.npmjs.org/expo-keep-awake/-/expo-keep-awake-56.0.3.tgz",
@@ -17292,6 +17314,20 @@
      "integrity": "sha512-ycoahZJnR9tWAVh/0mJYxbETtHRYaWjiWS8cHlP6aDGU6Q6Y8rZ5NKsuBwWw6HR2Pe30mfVFgbF2HrBR6gtYmw==",
      "requires": {}
    },
+    "expo-image-loader": {
+      "version": "56.0.3",
+      "resolved": "https://registry.npmjs.org/expo-image-loader/-/expo-image-loader-56.0.3.tgz",
+      "integrity": "sha512-JgUo4fUeU1ZC+z8iBFj8v7yoGQnZrLbOVPyNE+DWVrld55F2F6R1ck+rmdm/8TNWLz1LhNQfD7c3XYP1ZikxXA==",
+      "requires": {}
+    },
+    "expo-image-picker": {
+      "version": "56.0.18",
+      "resolved": "https://registry.npmjs.org/expo-image-picker/-/expo-image-picker-56.0.18.tgz",
+      "integrity": "sha512-sCjQ8M27bhGUv2vUavIE+uWdYo79b2D7Q5h9B66BSDZ+Rd8YyLVSf7vYGfIzQ7nMVoENZ6c4xo/JiDkEeQ9iTg==",
+      "requires": {
+        "expo-image-loader": "~56.0.3"
+      }
+    },
    "expo-keep-awake": {
      "version": "56.0.3",
      "resolved": "https://registry.npmjs.org/expo-keep-awake/-/expo-keep-awake-56.0.3.tgz",
--- a/package.json
+++ b/package.json
@@ -89,6 +89,7 @@
    "expo-clipboard": "^56.0.4",
    "expo-file-system": "^56.0.8",
    "expo-haptics": "^56.0.3",
+    "expo-image-picker": "^56.0.18",
    "expo-linking": "^56.0.14",
    "expo-network": "^56.0.5",
    "expo-sharing": "^56.0.18",
--- a/src/services/host-bridge/hostBridge.test.ts
+++ b/src/services/host-bridge/hostBridge.test.ts
@@ -1089,4 +1089,34 @@ describe('hostBridge', () => {
      }),
    });
  });
+
+  test('原生 App 宿主取消导入图片时回退为 false', async () => {
+    const invoke = vi.fn(
+      async (_command: string, args?: Record<string, unknown>) => {
+        const request = (args as { request: { id: string } }).request;
+        return {
+          bridge: 'GenarrativeHostBridge',
+          version: 1,
+          id: request.id,
+          ok: false,
+          error: {
+            code: 'cancelled',
+            message: 'file import cancelled',
+          },
+        };
+      },
+    );
+    window.history.replaceState(
+      null,
+      '',
+      nativeAppPath(['file.importImage']),
+    );
+    window.__TAURI__ = {
+      core: {
+        invoke: asTauriInvoke(invoke),
+      },
+    };
+
+    await expect(importHostImageFile()).resolves.toBe(false);
+  });
 });
--- a/src/services/host-bridge/hostBridge.ts
+++ b/src/services/host-bridge/hostBridge.ts
@@ -125,7 +125,8 @@ function isUnsupportedHostBridgeError(error: unknown) {
  return (
    error instanceof Error &&
    (error.name === 'unsupported_method' ||
-      error.name === 'unsupported_capability')
+      error.name === 'unsupported_capability' ||
+      error.name === 'cancelled')
  );
 }