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packages/weixin-sdk/src/chooseImage.ts

@@ -0,0 +1,83 @@
+import { getRuntimePlatform } from './env';
+import { ensureJssdkReady } from './jssdk';
+import type { WeixinSdkConfig } from './types';
+
+export type ChooseWechatImageOptions = {
+  count?: number;
+  sourceType?: Array<'album' | 'camera'>;
+};
+
+function base64ToFile(base64: string, fileName: string): File {
+  const normalized = base64.startsWith('data:')
+    ? base64
+    : `data:image/jpeg;base64,${base64.replace(/\s/g, '')}`;
+  const [header, body] = normalized.split(',');
+  const mime = header.match(/:(.*?);/)?.[1] ?? 'image/jpeg';
+  const binary = atob(body);
+  const bytes = new Uint8Array(binary.length);
+  for (let i = 0; i < binary.length; i++) bytes[i] = binary.charCodeAt(i);
+  return new File([bytes], fileName, { type: mime });
+}
+
+function localIdToFile(localId: string): Promise<File> {
+  return new Promise((resolve, reject) => {
+    if (!window.wx?.getLocalImgData) {
+      reject(new Error('微信 getLocalImgData 不可用'));
+      return;
+    }
+    window.wx.getLocalImgData({
+      localId,
+      success: (res) => {
+        try {
+          resolve(base64ToFile(res.localData, `wx-${Date.now()}.jpg`));
+        } catch (e) {
+          reject(e instanceof Error ? e : new Error('图片解析失败'));
+        }
+      },
+      fail: (err) => reject(new Error(err.errMsg || '读取图片失败')),
+    });
+  });
+}
+
+/** 微信内选图（相册/拍照），返回 File 列表；非微信环境返回 null */
+export async function chooseWechatImages(
+  config: WeixinSdkConfig,
+  options: ChooseWechatImageOptions = {},
+): Promise<File[] | null> {
+  const platform = getRuntimePlatform();
+  if (platform === 'browser') return null;
+
+  const count = options.count ?? 1;
+  const sourceType = options.sourceType ?? ['album', 'camera'];
+
+  if (platform === 'wechat-h5') {
+    await ensureJssdkReady({
+      apiBase: config.apiBase ?? '/api/v1',
+      clientApp: config.clientApp,
+      getAccessToken: config.getAccessToken,
+    });
+    if (!window.wx?.chooseImage) return null;
+
+    const localIds = await new Promise<string[]>((resolve, reject) => {
+      window.wx!.chooseImage!({
+        count,
+        sizeType: ['compressed'],
+        sourceType,
+        success: (res) => resolve(res.localIds ?? []),
+        fail: (err) => reject(new Error(err.errMsg || '无法打开相册')),
+      });
+    });
+
+    const files: File[] = [];
+    for (const localId of localIds) {
+      files.push(await localIdToFile(localId));
+    }
+    return files;
+  }
+
+  return null;
+}
+
+export function canUseWechatChooseImage(): boolean {
+  return getRuntimePlatform() !== 'browser';
+}

packages/weixin-sdk/src/index.ts

@@ -7,6 +7,8 @@ export {
 } from './location';
 export { scanQrCode } from './scan';
 export { invokeWechatPay } from './pay';
+export { chooseWechatImages, canUseWechatChooseImage } from './chooseImage';
+export type { ChooseWechatImageOptions } from './chooseImage';
 export {
   getWechatOAuthUrl,
   startWechatOAuthLogin,
@@ -25,6 +27,7 @@ import { initWechatJssdk } from './jssdk';
 import { getWechatLocation } from './location';
 import { scanQrCode } from './scan';
 import { invokeWechatPay } from './pay';
+import { chooseWechatImages } from './chooseImage';
 import {
   wechatLogin,
   handleWechatOAuthCallback,
@@ -43,6 +46,8 @@ export function createWeixinSdk(config: WeixinSdkConfig) {
     getPhoneNumber: () => getWechatPhoneNumber(config),
     getLocation: () => getWechatLocation(config),
     scanQrCode: () => scanQrCode(config),
+    chooseImages: (options?: Parameters<typeof chooseWechatImages>[1]) =>
+      chooseWechatImages(config, options),
     pay: (prepay: Parameters<typeof invokeWechatPay>[0]) =>
       invokeWechatPay(prepay, { apiBase: config.apiBase, clientApp: config.clientApp }),
   };

packages/weixin-sdk/src/types.ts

@@ -34,6 +34,18 @@ export type WxApi = {
     fail?: (res: { errMsg: string }) => void;
     cancel?: () => void;
   }) => void;
+  chooseImage: (options: {
+    count?: number;
+    sizeType?: Array<'original' | 'compressed'>;
+    sourceType?: Array<'album' | 'camera'>;
+    success?: (res: { localIds: string[] }) => void;
+    fail?: (res: { errMsg: string }) => void;
+  }) => void;
+  getLocalImgData: (options: {
+    localId: string;
+    success?: (res: { localData: string }) => void;
+    fail?: (res: { errMsg: string }) => void;
+  }) => void;
 };
 
 export type MiniProgramWx = {
@@ -80,6 +92,8 @@ export const DEFAULT_JS_API_LIST = [
   'getLocation',
   'scanQRCode',
   'chooseWXPay',
+  'chooseImage',
+  'getLocalImgData',
   'updateAppMessageShareData',
   'updateTimelineShareData',
 ] as const;