[RULE] Rule G006: Suggest payable Modifier on Admin-Only Functions

[mijinummi]

Labels: good-first-issue, gasguard-rules, bytecode, gasguard
Difficulty: Easy
Module: rules/g006_payable_admin.rs

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🧠 Concept

Add rule G006 to recommend adding the payable modifier to strictly restricted administrative functions (onlyOwner, onlyAdmin).

⚠️ Problem

Non-payable functions generate explicit EVM bytecode checks (callvalue / iszero / revert) to verify that no ETH was sent, consuming ~24 extra gas per execution.

📁 Implementation Scope

• rules/g006_payable_admin.rs
• test/fixtures/g006_samples.sol

🛠️ Requirements

1. Identify functions protected by access-control modifiers (e.g., onlyOwner).
2. If the function is not marked payable, flag it with an optimization suggestion.

🎯 Acceptance Criteria

• Correctly identifies restricted functions lacking payable.
• Ignores public user-facing functions where ETH checks are necessary.

[Thoni76]

@Thoni76 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi, please i would love to work on this issues

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[Leothosine]

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Hello, I'd like to pick this issue up.

I'm an experienced software engineer with a strong foundation in JavaScript/TypeScript, distributed systems, and API development. I care about code quality, test coverage, and clear communication in open source work.

I've gone through the details of this issue and I'm confident I can deliver a clean, well-tested solution that fits the codebase.

I'd love the opportunity to work on this — please consider assigning it to me.

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