20 lines
854 B
JavaScript
20 lines
854 B
JavaScript
import { isArrayBuffer } from "@smithy/is-array-buffer";
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import { toHex } from "@smithy/util-hex-encoding";
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import { toUint8Array } from "@smithy/util-utf8";
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import { SHA256_HEADER, UNSIGNED_PAYLOAD } from "./constants";
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export const getPayloadHash = async ({ headers, body }, hashConstructor) => {
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for (const headerName of Object.keys(headers)) {
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if (headerName.toLowerCase() === SHA256_HEADER) {
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return headers[headerName];
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}
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}
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if (body == undefined) {
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return "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
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}
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else if (typeof body === "string" || ArrayBuffer.isView(body) || isArrayBuffer(body)) {
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const hashCtor = new hashConstructor();
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hashCtor.update(toUint8Array(body));
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return toHex(await hashCtor.digest());
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}
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return UNSIGNED_PAYLOAD;
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};
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