'use strict';
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var utils = require('../utils');
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/**
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* Convert a data object to FormData
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* @param {Object} obj
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* @param {?Object} [formData]
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* @returns {Object}
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**/
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function toFormData(obj, formData) {
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// eslint-disable-next-line no-param-reassign
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formData = formData || new FormData();
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var stack = [];
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function convertValue(value) {
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if (value === null) return '';
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if (utils.isDate(value)) {
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return value.toISOString();
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}
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if (utils.isArrayBuffer(value) || utils.isTypedArray(value)) {
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return typeof Blob === 'function' ? new Blob([value]) : Buffer.from(value);
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}
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return value;
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}
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function build(data, parentKey) {
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if (utils.isPlainObject(data) || utils.isArray(data)) {
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if (stack.indexOf(data) !== -1) {
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throw Error('Circular reference detected in ' + parentKey);
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}
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stack.push(data);
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utils.forEach(data, function each(value, key) {
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if (utils.isUndefined(value)) return;
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var fullKey = parentKey ? parentKey + '.' + key : key;
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var arr;
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if (value && !parentKey && typeof value === 'object') {
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if (utils.endsWith(key, '{}')) {
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// eslint-disable-next-line no-param-reassign
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value = JSON.stringify(value);
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} else if (utils.endsWith(key, '[]') && (arr = utils.toArray(value))) {
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// eslint-disable-next-line func-names
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arr.forEach(function(el) {
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!utils.isUndefined(el) && formData.append(fullKey, convertValue(el));
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});
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return;
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}
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}
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build(value, fullKey);
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});
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stack.pop();
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} else {
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formData.append(parentKey, convertValue(data));
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}
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}
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build(obj);
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return formData;
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}
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module.exports = toFormData;
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