createChecksumStream.browser.js•1.83 kB
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.createChecksumStream = void 0;
const util_base64_1 = require("@smithy/util-base64");
const stream_type_check_1 = require("../stream-type-check");
const ChecksumStream_browser_1 = require("./ChecksumStream.browser");
const createChecksumStream = ({ expectedChecksum, checksum, source, checksumSourceLocation, base64Encoder, }) => {
if (!(0, stream_type_check_1.isReadableStream)(source)) {
throw new Error(`@smithy/util-stream: unsupported source type ${source?.constructor?.name ?? source} in ChecksumStream.`);
}
const encoder = base64Encoder ?? util_base64_1.toBase64;
if (typeof TransformStream !== "function") {
throw new Error("@smithy/util-stream: unable to instantiate ChecksumStream because API unavailable: ReadableStream/TransformStream.");
}
const transform = new TransformStream({
start() { },
async transform(chunk, controller) {
checksum.update(chunk);
controller.enqueue(chunk);
},
async flush(controller) {
const digest = await checksum.digest();
const received = encoder(digest);
if (expectedChecksum !== received) {
const error = new Error(`Checksum mismatch: expected "${expectedChecksum}" but received "${received}"` +
` in response header "${checksumSourceLocation}".`);
controller.error(error);
}
else {
controller.terminate();
}
},
});
source.pipeThrough(transform);
const readable = transform.readable;
Object.setPrototypeOf(readable, ChecksumStream_browser_1.ChecksumStream.prototype);
return readable;
};
exports.createChecksumStream = createChecksumStream;