初始化环境文件

node_modules/@smithy/util-stream/dist-es/checksum/createChecksumStream.browser.js

@@ -0,0 +1,35 @@
+import { toBase64 } from "@smithy/util-base64";
+import { isReadableStream } from "../stream-type-check";
+import { ChecksumStream } from "./ChecksumStream.browser";
+export const createChecksumStream = ({ expectedChecksum, checksum, source, checksumSourceLocation, base64Encoder, }) => {
+    if (!isReadableStream(source)) {
+        throw new Error(`@smithy/util-stream: unsupported source type ${source?.constructor?.name ?? source} in ChecksumStream.`);
+    }
+    const encoder = base64Encoder ?? toBase64;
+    if (typeof TransformStream !== "function") {
+        throw new Error("@smithy/util-stream: unable to instantiate ChecksumStream because API unavailable: ReadableStream/TransformStream.");
+    }
+    const transform = new TransformStream({
+        start() { },
+        async transform(chunk, controller) {
+            checksum.update(chunk);
+            controller.enqueue(chunk);
+        },
+        async flush(controller) {
+            const digest = await checksum.digest();
+            const received = encoder(digest);
+            if (expectedChecksum !== received) {
+                const error = new Error(`Checksum mismatch: expected "${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.prototype);
+    return readable;
+};