112 lines
2.8 KiB
JavaScript
112 lines
2.8 KiB
JavaScript
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import {TextEncoder} from 'util';
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import {Readable} from 'stream';
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import utils from "../utils.js";
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import readBlob from "./readBlob.js";
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const BOUNDARY_ALPHABET = utils.ALPHABET.ALPHA_DIGIT + '-_';
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const textEncoder = new TextEncoder();
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const CRLF = '\r\n';
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const CRLF_BYTES = textEncoder.encode(CRLF);
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const CRLF_BYTES_COUNT = 2;
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class FormDataPart {
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constructor(name, value) {
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const {escapeName} = this.constructor;
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const isStringValue = utils.isString(value);
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let headers = `Content-Disposition: form-data; name="${escapeName(name)}"${
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!isStringValue && value.name ? `; filename="${escapeName(value.name)}"` : ''
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}${CRLF}`;
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if (isStringValue) {
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value = textEncoder.encode(String(value).replace(/\r?\n|\r\n?/g, CRLF));
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} else {
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headers += `Content-Type: ${value.type || "application/octet-stream"}${CRLF}`
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}
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this.headers = textEncoder.encode(headers + CRLF);
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this.contentLength = isStringValue ? value.byteLength : value.size;
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this.size = this.headers.byteLength + this.contentLength + CRLF_BYTES_COUNT;
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this.name = name;
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this.value = value;
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}
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async *encode(){
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yield this.headers;
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const {value} = this;
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if(utils.isTypedArray(value)) {
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yield value;
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} else {
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yield* readBlob(value);
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}
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yield CRLF_BYTES;
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}
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static escapeName(name) {
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return String(name).replace(/[\r\n"]/g, (match) => ({
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'\r' : '%0D',
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'\n' : '%0A',
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'"' : '%22',
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}[match]));
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}
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}
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const formDataToStream = (form, headersHandler, options) => {
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const {
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tag = 'form-data-boundary',
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size = 25,
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boundary = tag + '-' + utils.generateString(size, BOUNDARY_ALPHABET)
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} = options || {};
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if(!utils.isFormData(form)) {
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throw TypeError('FormData instance required');
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}
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if (boundary.length < 1 || boundary.length > 70) {
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throw Error('boundary must be 10-70 characters long')
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}
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const boundaryBytes = textEncoder.encode('--' + boundary + CRLF);
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const footerBytes = textEncoder.encode('--' + boundary + '--' + CRLF + CRLF);
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let contentLength = footerBytes.byteLength;
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const parts = Array.from(form.entries()).map(([name, value]) => {
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const part = new FormDataPart(name, value);
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contentLength += part.size;
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return part;
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});
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contentLength += boundaryBytes.byteLength * parts.length;
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contentLength = utils.toFiniteNumber(contentLength);
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const computedHeaders = {
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'Content-Type': `multipart/form-data; boundary=${boundary}`
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}
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if (Number.isFinite(contentLength)) {
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computedHeaders['Content-Length'] = contentLength;
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}
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headersHandler && headersHandler(computedHeaders);
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return Readable.from((async function *() {
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for(const part of parts) {
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yield boundaryBytes;
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yield* part.encode();
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}
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yield footerBytes;
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})());
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};
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export default formDataToStream;
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