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PHP Version:

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✏️ Editing: formDataToStream.js

import {TextEncoder} from 'util';
import {Readable} from 'stream';
import utils from "../utils.js";
import readBlob from "./readBlob.js";

const BOUNDARY_ALPHABET = utils.ALPHABET.ALPHA_DIGIT + '-_';

const textEncoder = new TextEncoder();

const CRLF = '\r\n';
const CRLF_BYTES = textEncoder.encode(CRLF);
const CRLF_BYTES_COUNT = 2;

class FormDataPart {
  constructor(name, value) {
    const {escapeName} = this.constructor;
    const isStringValue = utils.isString(value);

let headers = `Content-Disposition: form-data; name="${escapeName(name)}"${
      !isStringValue && value.name ? `; filename="${escapeName(value.name)}"` : ''
    }${CRLF}`;

if (isStringValue) {
      value = textEncoder.encode(String(value).replace(/\r?\n|\r\n?/g, CRLF));
    } else {
      headers += `Content-Type: ${value.type || "application/octet-stream"}${CRLF}`
    }

this.headers = textEncoder.encode(headers + CRLF);

this.contentLength = isStringValue ? value.byteLength : value.size;

this.size = this.headers.byteLength + this.contentLength + CRLF_BYTES_COUNT;

this.name = name;
    this.value = value;
  }

async *encode(){
    yield this.headers;

const {value} = this;

if(utils.isTypedArray(value)) {
      yield value;
    } else {
      yield* readBlob(value);
    }

yield CRLF_BYTES;
  }

static escapeName(name) {
      return String(name).replace(/[\r\n"]/g, (match) => ({
        '\r' : '%0D',
        '\n' : '%0A',
        '"' : '%22',
      }[match]));
  }
}

const formDataToStream = (form, headersHandler, options) => {
  const {
    tag = 'form-data-boundary',
    size = 25,
    boundary = tag + '-' + utils.generateString(size, BOUNDARY_ALPHABET)
  } = options || {};

if(!utils.isFormData(form)) {
    throw TypeError('FormData instance required');
  }

if (boundary.length < 1 || boundary.length > 70) {
    throw Error('boundary must be 10-70 characters long')
  }

const boundaryBytes = textEncoder.encode('--' + boundary + CRLF);
  const footerBytes = textEncoder.encode('--' + boundary + '--' + CRLF + CRLF);
  let contentLength = footerBytes.byteLength;

const parts = Array.from(form.entries()).map(([name, value]) => {
    const part = new FormDataPart(name, value);
    contentLength += part.size;
    return part;
  });

contentLength += boundaryBytes.byteLength * parts.length;

contentLength = utils.toFiniteNumber(contentLength);

const computedHeaders = {
    'Content-Type': `multipart/form-data; boundary=${boundary}`
  }

if (Number.isFinite(contentLength)) {
    computedHeaders['Content-Length'] = contentLength;
  }

headersHandler && headersHandler(computedHeaders);

return Readable.from((async function *() {
    for(const part of parts) {
      yield boundaryBytes;
      yield* part.encode();
    }

yield footerBytes;
  })());
};

export default formDataToStream;

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