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Design Patterns · medium

11. Capability Design Pattern

Token-based access control and administrative rights.

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Instead of checking `sender == admin_address`, Move uses unforgeable Capability objects (`AdminCap`). Holding and passing the capability object into an entry function proves authorization.

move
public struct AdminCap has key, store { id: UID }

public fun mint_special(_: &AdminCap, ctx: &mut TxContext) {
    // Authorized action
}

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Check your understanding

1. What is the Capability pattern in Sui Move?
Using linear objects (e.g. AdminCap) as unforgeable bearer credentials for access controlChecking hardcoded public keys in a contractA cryptography algorithmA staking pool
2. What makes a Capability impossible to spoof in Move?
Modules only allow construction of a struct within its defining moduleThe validator overrides itIt is encrypted with SHA-256It costs 10 SOL

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