YelayMaths/yelaymaths/utils/api.js

/**
 * 统一请求层与接口封装。
 *
 * 替代旧版本「每个接口手写一遍 wx.request + Promise」的写法。
 * 职责：
 *   - 自动附带 Authorization
 *   - 统一解包 { code, message, data, requestId }
 *   - token 失效自动刷新，刷新失败自动重新登录
 */

const config = require('../config/index');
const store = require('./store');

/** 进行中的刷新，避免并发 401 触发多次刷新 */
let refreshing = null;

function staticUrl(path) {
  if (!path) return '';
  if (/^https?:\/\//i.test(path)) return path;
  return config.STATIC_BASE_URL.replace(/\/+$/, '') + '/' + String(path).replace(/^\/+/, '');
}

function normalizeError(body, statusCode) {
  if (body && typeof body.code === 'number') {
    return { code: body.code, message: body.message || '请求失败', requestId: body.requestId };
  }
  return { code: -1, message: '服务异常（' + statusCode + '）' };
}

/** 底层请求。不做鉴权重试，返回完整响应体。 */
function rawRequest(options) {
  const header = { 'content-type': 'application/json' };
  if (options.auth !== false) {
    const token = store.getToken();
    if (token) header.Authorization = 'Bearer ' + token;
  }

  return new Promise((resolve, reject) => {
    wx.request({
      url: config.API_BASE_URL.replace(/\/+$/, '') + options.url,
      method: options.method || 'GET',
      data: options.data,
      header,
      timeout: config.TIMEOUT,
      success(res) {
        resolve({ statusCode: res.statusCode, body: res.data || {} });
      },
      fail() {
        reject({ code: -1, message: '网络异常，请检查网络后重试' });
      },
    });
  });
}

/** 带鉴权的请求。token 失效时刷新一次并重试。 */
function request(options) {
  return rawRequest(options).then(({ statusCode, body }) => {
    if (body.code === 0) return body.data;

    const needLogin = statusCode === 401 || body.code === 2000 || body.code === 2001;
    if (needLogin && options.auth !== false && options.retried !== true) {
      return refreshAccessToken()
        .then(() => request(Object.assign({}, options, { retried: true })))
        .catch(() => {
          store.reset();
          throw { code: 2000, message: '登录已过期，请重新进入小程序' };
        });
    }

    throw normalizeError(body, statusCode);
  });
}

function refreshAccessToken() {
  if (refreshing) return refreshing;
  const refreshToken = store.getRefreshToken();
  if (!refreshToken) return Promise.reject({ code: 2000, message: '未登录' });

  refreshing = rawRequest({
    url: '/v1/auth/refresh',
    method: 'POST',
    data: { refreshToken },
    auth: false,
  })
    .then(({ body }) => {
      if (body.code !== 0) throw { code: 2000, message: '登录已过期' };
      store.setTokens(body.data.accessToken);
      return body.data.accessToken;
    })
    .finally(() => {
      refreshing = null;
    });

  return refreshing;
}

// ── 登录 ──────────────────────────────────────────────────────────────────

/** wx.login 换 code，再用 code 换服务端 token。 */
function login() {
  return new Promise((resolve, reject) => {
    wx.login({
      success(res) {
        if (!res.code) {
          reject({ code: 3002, message: '微信登录失败，请重试' });
          return;
        }
        request({
          url: '/v1/auth/wx-login',
          method: 'POST',
          data: { code: res.code },
          auth: false,
        })
          .then((data) => {
            store.setTokens(data.accessToken, data.refreshToken);
            store.setUser(data.user);
            resolve(data);
          })
          .catch(reject);
      },
      fail() {
        reject({ code: 3002, message: '微信登录失败，请重试' });
      },
    });
  });
}

function logout() {
  return request({ url: '/v1/auth/logout', method: 'POST' }).catch(() => null).then(() => {
    store.reset();
  });
}

// ── 首页内容 ──────────────────────────────────────────────────────────────

const api = {
  staticUrl,
  login,
  logout,

  getConfig: () => request({ url: '/v1/config', auth: false }),
  getBanners: () => request({ url: '/v1/banners', auth: false }),
  getHomeCourses: () => request({ url: '/v1/home/courses', auth: false }),
  getHomeFreeCourses: () => request({ url: '/v1/home/free-courses', auth: false }),
  getArticles: (page, pageSize) =>
    request({ url: '/v1/articles?page=' + (page || 1) + '&pageSize=' + (pageSize || 10), auth: false }),
  getArticle: (id) => request({ url: '/v1/articles/' + id, auth: false }),
  getTips: () => request({ url: '/v1/tips', auth: false }),

  // ── 课程 ────────────────────────────────────────────────────────────
  getCourses: () => request({ url: '/v1/courses' }),
  getCourse: (code) => request({ url: '/v1/courses/' + code }),
  getLessons: (code) => request({ url: '/v1/courses/' + code + '/lessons' }),
  getPlayUrl: (code, chapterId, playId) =>
    request({
      url:
        '/v1/courses/' +
        code +
        '/play?chapterId=' +
        encodeURIComponent(chapterId) +
        '&playId=' +
        encodeURIComponent(playId),
    }),
  getFreeLessons: (seriesNo) =>
    request({ url: '/v1/free-lessons' + (seriesNo === undefined ? '' : '?seriesNo=' + seriesNo), auth: false }),

  // ── 用户 ────────────────────────────────────────────────────────────
  getMe: () => request({ url: '/v1/me' }),
  updateMe: (payload) => request({ url: '/v1/me', method: 'PATCH', data: payload }),
  getEntitlements: () => request({ url: '/v1/me/entitlements' }),

  // ── 订单与支付 ──────────────────────────────────────────────────────
  createOrder: (courseCode) =>
    request({ url: '/v1/orders', method: 'POST', data: { courseCode: courseCode } }),
  getOrder: (outTradeNo) => request({ url: '/v1/orders/' + outTradeNo }),
};

/**
 * 拉起虚拟支付。
 *
 * 支付成功只代表「钱付了」，权益由服务端收到发货推送后发放，
 * 因此这里不直接开通课程，而是让调用方轮询订单状态。
 */
function requestVirtualPayment(payData) {
  return new Promise((resolve, reject) => {
    wx.requestVirtualPayment({
      signData: payData.signData,
      mode: payData.mode,
      paySig: payData.paySig,
      signature: payData.signature,
      success: resolve,
      fail: reject,
    });
  });
}

module.exports = Object.assign(api, { requestVirtualPayment });