etools-ajax-data-mixin.js

/* eslint-disable linebreak-style */
import {dedupingMixin} from '@polymer/polymer/lib/utils/mixin.js';
/* eslint-disable no-unused-vars */

/**
 * @polymer
 * @mixinFunction
 */
const EtoolsAjaxDataMixin = dedupingMixin(
  (baseClass) =>
    class extends baseClass {
      /* eslint-enable no-unused-vars */

      _prepareMultiPartFormData(inputBody, prepareMultipartData) {
        if (inputBody instanceof FormData) {
          return inputBody; // body is already a FromData object
        }
        let formBody = new FormData();
        const keys = Object.keys(inputBody);

        const self = this;
        keys.forEach((key) => {
          if (prepareMultipartData) {
            formBody = self._prepareFormData(self, formBody, inputBody[key], key);
          } else {
            formBody.append(key, inputBody[key]);
          }
        });

        return formBody;
      }

      _prepareFormData(self, body, data, key) {
        if (Array.isArray(data)) {
          if (data.length === 0) {
            // empty array
            body.append(key, []);
          } else {
            // not empty array
            data.forEach((arrData, mainIndex) => {
              const k = key + '[' + mainIndex + ']';
              if (self._isSimpleObject(arrData)) {
                // Object, not null
                Object.keys(arrData).forEach((keyArrData) => {
                  body = self._prepareFormData(self, body, arrData[keyArrData], k + '[_obj][' + keyArrData + ']');
                });
              } else if (self._isFile(arrData)) {
                // File or Blobs
                body.append(k, arrData);
              } else if (Array.isArray(arrData)) {
                // Array
                body = self._prepareFormData(self, body, arrData, k);
              } else {
                // strings, null, numbers
                body.append(k, arrData);
              }
            });
          }
        } else if (self._isSimpleObject(data)) {
          // Object, not null
          Object.keys(data).forEach((keyArrData) => {
            body = self._prepareFormData(self, body, data[keyArrData], key + '[_obj][' + keyArrData + ']');
          });
        } else {
          // for Blob, File, strings, null vals
          body.append(key, data);
        }
        return body;
      }

      _isFile(data) {
        return data instanceof File || data instanceof Blob;
      }

      _isSimpleObject(data) {
        return data !== null && typeof data === 'object' && !Array.isArray(data) && !this._isFile(data);
      }
    }
);

export default EtoolsAjaxDataMixin;