Implement `cancel_proposal` Entrypoint

[grantfox-oss]

Description:

Allow governed cancellation for risky or stale proposals.

Tasks:

• Implement cancel logic with role checks and state checks
• Prevent executing cancelled proposals
• Emit proposal_cancelled event
• Add tests for unauthorized cancellation and cancelled-execution rejection

Acceptance Criteria:

Cancellation is enforced correctly and fully covered by tests.

[Austinaminu2]

Gm,

I’d like to work on this issue.

I have experience working with Rust and Soroban smart contracts, including governance logic and authorization checks. I will implement proposal cancellation with proper role and state validation, prevent execution of cancelled proposals, emit a proposal_cancelled event, and add tests covering unauthorized cancellation and cancelled-execution rejection.

ETA: within 2–3 hours.

Please assign this issue to me.

[Austinaminu2]

Hi,

I’d like to work on this issue.

I have experience working with Rust and Soroban smart contracts, including governance logic and authorization checks. I will implement proposal cancellation with proper role and state validation, prevent execution of cancelled proposals, emit a proposal_cancelled event, and add tests covering unauthorized cancellation and cancelled-execution rejection.

ETA: within 2–3 hours.

Please assign this issue to me.

[edehvictor]

Hello maintainer, I'm cracked Engineer. Can I be assigned to this
ETA:3HRS

[Kaylahray]

Hi Maintainer🙋‍♀️, I can Implement the cancel proposal entry point. Please assign

[EDOHWARES]

Hi Maintainer, I’m interested in this issue. I’ll implement governed proposal cancellation with role and state checks, prevent execution of cancelled proposals, emit proposal_cancelled events, and add tests for unauthorized cancellation and execution rejection. ETA: 6 hours.

[ryzen-xp]

Hi maintainers 👋

I’m a blockchain developer with strong expertise in Stellar, Rust,TS and Stellar SDK integrations. I’ve worked on multiple Stellar-based smart contract and backend systems.

I understand the scope of this issue and can deliver a reliable, production-quality solution with proper tests and documentation.
Plz assign me !!

ETA: 12 hours

[yahia008]

Hi Maintainers 👋

I’d like to work on this issue.

Understanding

This task focuses on implementing a governed cancellation mechanism for proposals that may become risky, invalid, or stale. The goal is to ensure that cancelled proposals cannot be executed and that the system properly enforces role and state validation.

Implementation Plan

I will:

1. Implement cancellation logic

Add a cancel_proposal function.

Enforce role-based authorization for who can cancel proposals.

Validate proposal state checks before allowing cancellation.

2. Enforce execution protection

Ensure cancelled proposals cannot be executed.

3. Emit events

Emit a proposal_cancelled event when a proposal is successfully cancelled.

4. Write tests

Unauthorized cancellation attempts

Successful cancellation flow

Prevent execution of cancelled proposals

State validation edge cases

Goal

Ensure that proposal cancellation is secure, correctly enforced, and fully covered by tests.

Please assign this issue to me. I’m happy to start working on it. 🚀