getAwsChunkedEncodingStream.js•1.27 kB
import { Readable } from "stream";
export const getAwsChunkedEncodingStream = (readableStream, options) => {
const { base64Encoder, bodyLengthChecker, checksumAlgorithmFn, checksumLocationName, streamHasher } = options;
const checksumRequired = base64Encoder !== undefined &&
checksumAlgorithmFn !== undefined &&
checksumLocationName !== undefined &&
streamHasher !== undefined;
const digest = checksumRequired ? streamHasher(checksumAlgorithmFn, readableStream) : undefined;
const awsChunkedEncodingStream = new Readable({ read: () => { } });
readableStream.on("data", (data) => {
const length = bodyLengthChecker(data) || 0;
awsChunkedEncodingStream.push(`${length.toString(16)}\r\n`);
awsChunkedEncodingStream.push(data);
awsChunkedEncodingStream.push("\r\n");
});
readableStream.on("end", async () => {
awsChunkedEncodingStream.push(`0\r\n`);
if (checksumRequired) {
const checksum = base64Encoder(await digest);
awsChunkedEncodingStream.push(`${checksumLocationName}:${checksum}\r\n`);
awsChunkedEncodingStream.push(`\r\n`);
}
awsChunkedEncodingStream.push(null);
});
return awsChunkedEncodingStream;
};