javascript / expert
Snippet
Bitwise Permission Flag Masking in Next.js Dynamic Route Access Evaluators
Bitwise masking combines complex, multi-role security capabilities into a single integer vector. Evaluating permissions in Next.js route access guards using bitwise AND operations ensures sub-millisecond execution without dynamic object lookups.
snippet.js
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export const PERMISSIONS = Object.freeze({READ: 1 << 0,WRITE: 1 << 1,DELETE: 1 << 2,ADMIN: 1 << 3,});export function authorizeRouteAccess(userMask, requiredMask) {const isAdmin = (userMask & PERMISSIONS.ADMIN) !== 0;if (isAdmin) return true;return (userMask & requiredMask) === requiredMask;}
nextjs
Breakdown
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READ: 1 << 0,
Uses bit-shift operators to generate distinct binary bitmasks (0001, 0010, 0100, 1000) for granular permissions.
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return (userMask & requiredMask) === requiredMask;
Performs a bitwise AND comparison to verify whether all bits specified in requiredMask are enabled inside userMask.