96 lines
2.7 KiB
JavaScript
96 lines
2.7 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule FormData
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* @flow
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*/
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'use strict';
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type FormDataValue = any;
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type FormDataNameValuePair = [string, FormDataValue];
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type Headers = {[name: string]: string};
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type FormDataPart = {
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string: string;
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headers: Headers;
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} | {
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uri: string;
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headers: Headers;
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name?: string;
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type?: string;
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};
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/**
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* Polyfill for XMLHttpRequest2 FormData API, allowing multipart POST requests
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* with mixed data (string, native files) to be submitted via XMLHttpRequest.
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*
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* Example:
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*
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* var photo = {
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* uri: uriFromCameraRoll,
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* type: 'image/jpeg',
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* name: 'photo.jpg',
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* };
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*
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* var body = new FormData();
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* body.append('authToken', 'secret');
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* body.append('photo', photo);
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* body.append('title', 'A beautiful photo!');
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*
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* xhr.open('POST', serverURL);
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* xhr.send(body);
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*/
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class FormData {
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_parts: Array<FormDataNameValuePair>;
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_partsByKey: {[key: string]: FormDataNameValuePair};
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constructor() {
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this._parts = [];
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this._partsByKey = {};
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}
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append(key: string, value: FormDataValue) {
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var parts = this._partsByKey[key];
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if (parts) {
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// It's a bit unclear what the behaviour should be in this case.
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// The XMLHttpRequest spec doesn't specify it, while MDN says that
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// the any new values should appended to existing values. We're not
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// doing that for now -- it's tedious and doesn't seem worth the effort.
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parts[1] = value;
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return;
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}
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parts = [key, value];
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this._parts.push(parts);
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this._partsByKey[key] = parts;
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}
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getParts(): Array<FormDataPart> {
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return this._parts.map(([name, value]) => {
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var contentDisposition = 'form-data; name="' + name + '"';
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var headers: Headers = {'content-disposition': contentDisposition};
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if (typeof value === 'string') {
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return {string: value, headers, fieldName: name};
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}
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// The body part is a "blob", which in React Native just means
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// an object with a `uri` attribute. Optionally, it can also
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// have a `name` and `type` attribute to specify filename and
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// content type (cf. web Blob interface.)
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if (typeof value.name === 'string') {
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headers['content-disposition'] += '; filename="' + value.name + '"';
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}
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if (typeof value.type === 'string') {
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headers['content-type'] = value.type;
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}
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return {...value, headers, fieldName: name};
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});
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}
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}
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module.exports = FormData;
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