@lyra/form-builder/lib/lyra/uploads/image/readExif.js

Lyra form builder

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = readExif;

var _rxjs = require('rxjs');

var _operators = require('rxjs/operators');

var _exifComponent = require('exif-component');

var _exifComponent2 = _interopRequireDefault(_exifComponent);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function readFileAsArrayBuffer(file /*: File*/, length /*: number*/) {
  return new _rxjs.Observable(observer => {
    /* global window */
    const reader = new window.FileReader();
    reader.onerror = err => observer.error(err);
    reader.onload = () => {
      observer.next(reader.result);
      observer.complete();
    };
    reader.readAsArrayBuffer(length === undefined ? file : file.slice(0, length));
    return () => reader.abort();
  });
}


const SKIP_EXIF_ERROR_RE = /(invalid image format)|(No exif data)/i;

// 128k should be enough for exif data according to https://github.com/mattiasw/ExifReader#tips
const EXIF_BUFFER_LENGTH = 128000;

function readExif(file /*: File*/) {
  return (0, _rxjs.from)(readFileAsArrayBuffer(file, EXIF_BUFFER_LENGTH)).pipe((0, _operators.map)(buf => (0, _exifComponent2.default)(buf)), (0, _operators.catchError)(error => {
    if (!SKIP_EXIF_ERROR_RE.test(error.message)) {
      // Exif read failed, we do not want to fail hard
      console.warn(`Exif read failed, continuing anyway: ${error.message}`); // eslint-disable-line no-console
    }
    return (0, _rxjs.of)({});
  }));
}