rjweb-server/lib/esm/functions/toETag.js

Easy and Robust Way to create a Web Server with Many Easy-to-use Features in NodeJS

import { createHash } from "crypto";
/**
 * Generate a Hash from a Body, Headers & Status Code to be used for caching using SHA1
 * @since 6.0.0
*/ export default function toETag(data, headers, cookies, status) {
    if (status < 200 || status >= 400)
        return null;
    const hashed = createHash('sha1')
        .update(JSON.stringify(headers))
        .update(JSON.stringify(Object.values(cookies).map((v) => v.value)))
        .update(Buffer.from(data))
        .digest('hex');
    return `W/"${status.toString(16)}-${hashed}"`;
}