chat-app/src/utils/index.js

import axios from 'axios';
// BD-09 转 GCJ-02
export const bd09togcj02 = (bd_lon, bd_lat) => {
  const x_pi = (3.14159265358979324 * 3000.0) / 180.0;
  const x = bd_lon - 0.0065;
  const y = bd_lat - 0.006;
  const z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
  const theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
  const gg_lon = z * Math.cos(theta);
  const gg_lat = z * Math.sin(theta);
  return [gg_lon, gg_lat];
}
// GCJ-02 转 WGS-84
export const gcj02towgs84 = (lon, lat) => {
  const PI = 3.1415926535897932384626;
  const a = 6378245.0;
  const ee = 0.00669342162296594323;

  const transformLat = (x, y) => {
    let ret =
      -100.0 +
      2.0 * x +
      3.0 * y +
      0.2 * y * y +
      0.1 * x * y +
      0.2 * Math.sqrt(Math.abs(x));
    ret +=
      ((20.0 * Math.sin(6.0 * x * PI) + 20.0 * Math.sin(2.0 * x * PI)) *
        2.0) /
      3.0;
    ret +=
      ((20.0 * Math.sin(y * PI) + 40.0 * Math.sin((y / 3.0) * PI)) * 2.0) /
      3.0;
    ret +=
      ((160.0 * Math.sin((y / 12.0) * PI) +
        320 * Math.sin((y * PI) / 30.0)) *
        2.0) /
      3.0;
    return ret;
  };

  const transformLon = (x, y) => {
    let ret =
      300.0 +
      x +
      2.0 * y +
      0.1 * x * x +
      0.1 * x * y +
      0.1 * Math.sqrt(Math.abs(x));
    ret +=
      ((20.0 * Math.sin(6.0 * x * PI) + 20.0 * Math.sin(2.0 * x * PI)) *
        2.0) /
      3.0;
    ret +=
      ((20.0 * Math.sin(x * PI) + 40.0 * Math.sin((x / 3.0) * PI)) * 2.0) /
      3.0;
    ret +=
      ((150.0 * Math.sin((x / 12.0) * PI) +
        300.0 * Math.sin((x / 30.0) * PI)) *
        2.0) /
      3.0;
    return ret;
  };

  const dLat = transformLat(lon - 105.0, lat - 35.0);
  const dLon = transformLon(lon - 105.0, lat - 35.0);
  const radLat = (lat / 180.0) * PI;
  let magic = Math.sin(radLat);
  magic = 1 - ee * magic * magic;
  const sqrtMagic = Math.sqrt(magic);
  const mgLat =
    lat + (dLat * 180.0) / (((a * (1 - ee)) / (magic * sqrtMagic)) * PI);
  const mgLon =
    lon + (dLon * 180.0) / ((a / sqrtMagic) * Math.cos(radLat) * PI);
  return [lon * 2 - mgLon, lat * 2 - mgLat];
}

export const convertBd09ToWgs84 = (bd_lon, bd_lat) => {
  const gcj02 = this.bd09togcj02(bd_lon, bd_lat);
  const wgs84 = this.gcj02towgs84(gcj02[0], gcj02[1]);
  return {
    longitude: wgs84[0],
    latitude: wgs84[1],
  };
}

export const uniqueId = () => 'id-' + new Date().getTime().toString(36) + '-' + Math.random().toString(36).substr(2, 9);

export const getFileType = (url) => {
  // 从URL中提取文件扩展名
  const ext = url.split('.').pop()?.toLowerCase()

  // 图片类型
  if(ext === 'jpg' || ext === 'jpeg') {
    return 'image/jpeg'
  }
  if(ext === 'png') {
    return 'image/png'
  }
  if(ext === 'gif') {
    return 'image/gif'
  }
  if(ext === 'webp') {
    return 'image/webp'
  }

  // 视频类型
  if(ext === 'mp4') {
    return 'video/mp4'
  }
  if(ext === 'webm') {
    return 'video/webm'
  }
  if(ext === 'avi') {
    return 'video/x-msvideo'
  }

  // 音频类型
  if(ext === 'mp3') {
    return 'audio/mpeg'
  }
  if(ext === 'wav') {
    return 'audio/wav'
  }
  if(ext === 'ogg') {
    return 'audio/ogg'
  }

  // 文档类型
  if(ext === 'pdf') {
    return 'application/pdf'
  }
  if(ext === 'doc' || ext === 'docx') {
    return 'application/msword'
  }
  if(ext === 'xls' || ext === 'xlsx') {
    return 'application/vnd.ms-excel'
  }

  // 默认返回二进制流类型
  return 'application/octet-stream'
}

export const getFileFromUrl = (url, fileName) => {
  return new Promise(async(resolve, reject) => {
    const osName = uni.getSystemInfoSync().osName;
    if (osName === "android") {
      var blob = null;
      var xhr = new XMLHttpRequest();
      xhr.open("GET", url);
      xhr.setRequestHeader('Accept',getFileType(url));
      xhr.responseType = "blob";
      // 加载时处理
      xhr.onload = () => {
        // 获取返回结果
          blob = xhr.response;
          let file= new File([blob], fileName, { type: getFileType(url) });
          // 返回结果
          console.log(file);

          resolve(file);
      };
      xhr.onerror = (e) => {
          reject(e)
      };
      // 发送
      xhr.send();
    }else{
      const response = await fetch(url);
      const blob = await response.blob();
      const file = new File([blob], fileName, { type: getFileType(url) });
      resolve(file);
    }
  });
}