Initial

resources/app/node_modules/@smithy/signature-v4/dist-es/credentialDerivation.js

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+import { toHex } from "@smithy/util-hex-encoding";
+import { toUint8Array } from "@smithy/util-utf8";
+import { KEY_TYPE_IDENTIFIER, MAX_CACHE_SIZE } from "./constants";
+const signingKeyCache = {};
+const cacheQueue = [];
+export const createScope = (shortDate, region, service) => `${shortDate}/${region}/${service}/${KEY_TYPE_IDENTIFIER}`;
+export const getSigningKey = async (sha256Constructor, credentials, shortDate, region, service) => {
+    const credsHash = await hmac(sha256Constructor, credentials.secretAccessKey, credentials.accessKeyId);
+    const cacheKey = `${shortDate}:${region}:${service}:${toHex(credsHash)}:${credentials.sessionToken}`;
+    if (cacheKey in signingKeyCache) {
+        return signingKeyCache[cacheKey];
+    }
+    cacheQueue.push(cacheKey);
+    while (cacheQueue.length > MAX_CACHE_SIZE) {
+        delete signingKeyCache[cacheQueue.shift()];
+    }
+    let key = `AWS4${credentials.secretAccessKey}`;
+    for (const signable of [shortDate, region, service, KEY_TYPE_IDENTIFIER]) {
+        key = await hmac(sha256Constructor, key, signable);
+    }
+    return (signingKeyCache[cacheKey] = key);
+};
+export const clearCredentialCache = () => {
+    cacheQueue.length = 0;
+    Object.keys(signingKeyCache).forEach((cacheKey) => {
+        delete signingKeyCache[cacheKey];
+    });
+};
+const hmac = (ctor, secret, data) => {
+    const hash = new ctor(secret);
+    hash.update(toUint8Array(data));
+    return hash.digest();
+};