@yhiot/utils/lib/fetchImage.js

基本工具集

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.fetchImageBase64UrlEncode = exports.fetchImageBase64 = exports.fetchImageBuffer = exports.fetchImage = void 0;

require("isomorphic-fetch");

var _console = _interopRequireDefault(require("console"));

var fetchImage = function fetchImage(url) {
  if (!url) {
    _console.default.log('error! url=null!');
  }

  _console.default.log('request', url);

  return fetch(url, {
    method: 'GET'
  }).catch(function (error) {
    _console.default.error('error!', error, url);

    throw new Error('网络请求失败!');
  }).then(function (response) {
    if (!response.ok) {
      throw new Error(response.statusText);
    }

    if (response.status === 204) {
      throw new Error('没有数据!');
    }

    return response;
  });
};

exports.fetchImage = fetchImage;

var fetchImageBuffer = function fetchImageBuffer(url) {
  return fetchImage(url).then(function (response) {
    var contentType = response.headers.get('content-type'); // let buffer = response.arrayBuffer();

    return response.buffer().then(function (buffer) {
      return {
        contentType: contentType,
        buffer: buffer
      };
    });
  });
};

exports.fetchImageBuffer = fetchImageBuffer;

var fetchImageBase64 = function fetchImageBase64(url) {
  return fetchImageBuffer(url).then(function (_ref) {
    var contentType = _ref.contentType,
        buffer = _ref.buffer;

    if (buffer) {
      if (['image/jpg', 'image/bmp', 'image/png', 'image/jpeg'].indexOf(contentType) >= 0) {
        var base64Flag = 'data:' + contentType + ';base64,'; // let imageStr = arrayBufferToBase64(buffer);

        var imageStr = buffer.toString('base64');
        return base64Flag + imageStr;
      }
    }

    return null;
  });
};

exports.fetchImageBase64 = fetchImageBase64;

var fetchImageBase64UrlEncode = function fetchImageBase64UrlEncode(url) {
  return fetchImageBuffer(url).then(function (_ref2) {
    var contentType = _ref2.contentType,
        buffer = _ref2.buffer;

    if (buffer) {
      if (['image/jpg', 'image/bmp', 'image/png', 'image/jpeg'].indexOf(contentType) >= 0) {
        // let base64Flag = 'data:' + contentType + ';base64,';
        // let imageStr = arrayBufferToBase64(buffer);
        var imageStr = buffer.toString('base64');
        return encodeURIComponent(imageStr); // return base64Flag + encodeURIComponent(imageStr);
      }
    }

    return null;
  });
}; // function arrayBufferToBase64(buffer) {
//   let binary = '';
//   let bytes = [].slice.call(new Uint8Array(buffer));
//   bytes.forEach(b => (binary += String.fromCharCode(b)));
//   return window.btoa(binary);
//   // return binary.toString('base64');
// }


exports.fetchImageBase64UrlEncode = fetchImageBase64UrlEncode;