[CT-05] Implement on-chain Dispute Window Checker for bookings in Rust

[devwums]

Problem

There is no on-chain enforcement of a dispute window. Members can dispute a booking at any time — even months after checkout — with no time constraint.

Proposed Solution

Create contracts/cntr/dispute_window.rs implementing: pub fn is_within_dispute_window(checkout_timestamp: u64, current_timestamp: u64, window_seconds: u64) -> bool and pub fn dispute_window_expires_at(checkout_timestamp: u64, window_seconds: u64) -> u64. Default dispute window is 48 hours (172,800 seconds). All implementation must live inside contracts/cntr/.

Acceptance Criteria

• File at contracts/cntr/dispute_window.rs
• Returns true when current_timestamp - checkout_timestamp < window_seconds
• Returns false when the window has passed
• dispute_window_expires_at returns checkout_timestamp + window_seconds
• At least 5 unit tests covering: inside window, outside window, exactly at boundary
• Compiles with cargo test

[RennyThompson]

@RennyThompson has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

can I please take on this issue.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @RennyThompson to this issue.

[drips-wave]

Congratulations, @RennyThompson! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @RennyThompson: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

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[RennyThompson]

Resolved in PR #1046 — contracts/cntr/src/dispute_window.rs added with is_within_dispute_window and dispute_window_expires_at, plus 5 unit tests.

[RennyThompson]

Resolved in PR #1046 — contracts/cntr/src/dispute_window.rs added with is_within_dispute_window and dispute_window_expires_at, plus 5 unit tests.