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form-data.js
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105 lines (90 loc) · 3.03 KB
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/**
* @license https://raw.githubusercontent.com/node-fetch/node-fetch/master/LICENSE.md
*
* The MIT License (MIT)
*
* Copyright (c) 2016 - 2020 Node Fetch Team
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Extracted from https://github.com/node-fetch/node-fetch/blob/64c5c296a0250b852010746c76144cb9e14698d9/src/utils/form-data.js
*/
const carriage = '\r\n'
const dashes = '-'.repeat(2)
const NAME = Symbol.toStringTag
const isBlob = object => {
return (
typeof object === 'object' &&
typeof object.arrayBuffer === 'function' &&
typeof object.type === 'string' &&
typeof object.stream === 'function' &&
typeof object.constructor === 'function' &&
/^(Blob|File)$/.test(object[NAME])
)
}
/**
* @param {string} boundary
*/
const getFooter = boundary => `${dashes}${boundary}${dashes}${carriage.repeat(2)}`
/**
* @param {string} boundary
* @param {string} name
* @param {*} field
*
* @return {string}
*/
function getHeader (boundary, name, field) {
let header = ''
header += `${dashes}${boundary}${carriage}`
header += `Content-Disposition: form-data; name="${name}"`
if (isBlob(field)) {
header += `; filename="${field.name}"${carriage}`
header += `Content-Type: ${field.type || 'application/octet-stream'}`
}
return `${header}${carriage.repeat(2)}`
}
/**
* @return {string}
*/
module.exports.getBoundary = () => {
// This generates a 50 character boundary similar to those used by Firefox.
// They are optimized for boyer-moore parsing.
let boundary = '--------------------------'
for (let i = 0; i < 24; i++) {
boundary += Math.floor(Math.random() * 10).toString(16)
}
return boundary
}
/**
* @param {FormData} form
* @param {string} boundary
*/
module.exports.formDataIterator = function * (form, boundary) {
for (const [name, value] of form) {
yield getHeader(boundary, name, value)
if (isBlob(value)) {
yield * value.stream()
} else {
yield value
}
yield carriage
}
yield getFooter(boundary)
}
module.exports.isBlob = isBlob