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Chapter 15/Beginning of Chapter/part2app/dist/server/cookies_signed.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.validateCookie = exports.signCookie = void 0;
+const crypto_1 = require("crypto");
+const signCookie = (value, secret) => {
+    return value + "." + (0, crypto_1.createHmac)("sha512", secret)
+        .update(value).digest("base64url");
+};
+exports.signCookie = signCookie;
+const validateCookie = (value, secret) => {
+    const cookieValue = value.split(".")[0];
+    const compareBuf = Buffer.from((0, exports.signCookie)(cookieValue, secret));
+    const candidateBuf = Buffer.from(value);
+    if (compareBuf.length == candidateBuf.length &&
+        (0, crypto_1.timingSafeEqual)(compareBuf, candidateBuf)) {
+        return cookieValue;
+    }
+    return undefined;
+};
+exports.validateCookie = validateCookie;