zby-live-sdk/src/channel/pomelo/util.js

This is a live SDK for weclassroom.

import pako from 'pako';
export default {
  translateRole(role, roleNum) {
    const roleArr = ['student', 'assist', 'teacher'];
    const roleNumArr = ['1', '2', '4'];
    if (roleArr.includes(role)) {
      return roleNumArr[roleArr.indexOf(role)];
    }
    if (roleNumArr.includes(roleNum)) {
      return roleArr[roleNumArr.indexOf(roleNum)];
    }
  },
  /**
   * 压缩 / 解压 json
   */
  zip(data) {
    if (data) {
      const str = JSON.stringify(data);
      const binaryString = pako.gzip(encodeURIComponent(str), {
        to: 'string'
      });
      return btoa(binaryString);
    }
  },
  unzip(b64Data) {
    let strData = atob(b64Data);
    // Convert binary string to character-number array
    const charData = strData.split('').map(function (x) {
      return x.charCodeAt(0);
    });
    // Turn number array into byte-array
    const binData = new Uint8Array(charData);
    // // unzip
    //   const data = pako.inflate(binData)
    const data = pako.inflate(binData, {to: 'string'});
    // Convert gunzipped byteArray back to ascii string:
    //   strData = arrayBufferToString(data)
    return decodeURIComponent(data);
  },
  arrayBufferToString(buffer) {
    const bufView = new Uint16Array(buffer);
    const length = bufView.length;
    let result = '';
    let addition = Math.pow(2, 16) - 1;

    for (var i = 0; i < length; i += addition) {
      if (i + addition > length) {
        addition = length - i;
      }
      result += String.fromCharCode.apply(null, bufView.subarray(i, i + addition));
    }
    return result;
  }
};