112 lines
2.8 KiB
JavaScript
112 lines
2.8 KiB
JavaScript
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;
|