[furkan3152]

Fixes #947

• New ConfidentialTokenError::InvalidLiveUntilLedger = 3515.
• storage::set_spender panics with it when live_until_ledger < e.ledger().sequence() or live_until_ledger > e.ledger().max_live_until_ledger(), the same bounds as the fungible set_allowance. The check runs before the account lookups, the auditor call and proof verification. Both bounds are inclusive.
• Updated the set_spender docs in lib.rs and storage.rs.
• Tests: a past live_until_ledger and max + 1 panic with #3515; the current ledger and max are accepted.

cargo test -p stellar-confidential (119 passed), clippy with -D warnings clean, check_error_codes.py passes, nightly fmt clean on the changed files.

PR Checklist

• Tests
• Documentation

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Walkthrough

set_spender now returns InvalidLiveUntilLedger when the requested expiration is earlier than the current ledger. Tests cover rejection of a past ledger and successful delegation when the expiration equals the current ledger.

Changes

Spender expiration validation

Layer / File(s)	Summary
Expiration error and API constraint packages/confidential/src/lib.rs, packages/confidential/src/storage.rs	The public error enum adds InvalidLiveUntilLedger = 3515. The set_spender documentation states that the expiration cannot be earlier than the current ledger.
Ledger check and boundary tests packages/confidential/src/storage.rs, packages/confidential/src/test.rs	set_spender checks the expiration before subsequent external calls or proof verification. Tests verify that a past expiration fails and an expiration equal to the current ledger succeeds, stores the expiration, and makes is_spender return true.

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Bug fix · Severity of issue fixed: Medium

Possibly related PRs

• OpenZeppelin/stellar-contracts#955: Implements the same fix for issue #947, including the error, ledger check, and boundary tests.

Suggested reviewers: brozorec

Merge Risk: Low · previous review d25d9

The change has low runtime risk, but required documentation citations and the stale error-range guidance should be corrected as follow-up.

Pre-merge checks: 5

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: rejecting expired live_until_ledger values in set_spender.
Linked Issues check		Issue #947 requires an early rejection when live_until_ledger < e.ledger().sequence(), with ConfidentialTokenError::InvalidLiveUntilLedger = 3515, before account lookups, auditor lookup, and proof…
Out of Scope Changes check		The reported changes are limited to the #947 fix: the error variant, the set_spender validation, related documentation, and boundary tests. These changes directly support the issue requirements. No …
Docstring Coverage		Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
Description check		The pull request description identifies the linked issue, explains the code and documentation changes, describes boundary behavior and validation, and completes the Tests and Documentation checklist.

Full details: Linked Issues check

Explanation

Issue #947 requires an early rejection when live_until_ledger < e.ledger().sequence(), with ConfidentialTokenError::InvalidLiveUntilLedger = 3515, before account lookups, auditor lookup, and proof verification. The supplied PR evidence states that set_spender performs this check before those operations. It also states that equality remains valid. The new tests cover ledger values 99 and 100 when the current sequence is 100.

Full details: Out of Scope Changes check

Explanation

The reported changes are limited to the #947 fix: the error variant, the set_spender validation, related documentation, and boundary tests. These changes directly support the issue requirements. No unrelated change is identified in the supplied evidence.

Full details: Docstring Coverage

Explanation

Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 1 functions across 3 files.

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_{A rabbit checks the ledger line,
No past-date bounds can slip inside.
The equal-day request is fine,
A fresh delegation waits with pride,
Then hops away beneath the moon.}

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Files selected for processing: 3

• packages/confidential/src/lib.rs
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Actionable comments posted: 3

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• Fix comments: Fix CodeRabbit comments on this PR

Prompt to fix review comments

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Inline comments:
Review comments at @packages/confidential/src/lib.rs:
- Around line 444-445: Update the live_until_ledger documentation near
ConfidentialToken::revoke_spender to cite the set-spender protocol document
using its path and heading anchor. Add the rule to that protocol section and
apply the corresponding citation to the storage-level documentation, using the
actual document paths and heading slugs.
- Around line 599-602: Update the scoped guide’s ConfidentialTokenError
allocation from 3500–3510 to 3500–3599 to match Architecture.md. Keep the
existing guidance about staying within the 3500s for satellites unchanged.

Review comments at @packages/confidential/src/storage.rs:
- Line 844: Add the required protocol documentation links to the set_spender
documentation and its rejection comment, including the comments noted at the
other affected locations. Use the docs path and heading slug for the same
protocol section that defines the expiration rule; verify the correct anchor
rather than guessing.

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[brozorec]

Good job, thanks for your contribution!

[furkan3152]

Thanks for the review! Dropped the docs changes and added the max_live_until_ledger bound like set_allowance, with tests for max and max + 1. All 119 tests pass.

[catalina-oz]

Reviewed commit ed81f70.

Review — stellar-confidential

• packages/confidential/src/storage.rs:881 — the new comment says the bound is "checked before any external call or proof verification". That is not true on the trait path. ConfidentialToken::set_spender runs Self::Hooks::on_set_spender before storage::set_spender. With ComplianceHooks, that hook calls the policy contract (check_policy) and can call the SAC authorized view (check_sac) before this check runs. Reword the comment to the claim that holds, as the PR description does: the check runs before the account lookups, the auditor call, and proof verification. The other option is to move the check into the trait entry point ahead of the hook.

Checked: 2 product files, 1 test file. Not run: cargo test reproduction (not needed for a comment-accuracy finding; CI runs the suite), network-limits.sh (no input-size or storage fan-out change). Unavailable: openzeppelin-platform.

[furkan3152]

@catalina-oz Good catch, thanks. I reworded the comment to the claim that holds: the check runs before the account lookups, the auditor call and proof verification (381c8e5). I kept it in storage::set_spender rather than moving it ahead of the hook, so the PR doesn't change when on_set_spender runs.

re-requested

[catalina-oz]

Reviewed commit 220dcbc.

No new findings.

Checked: 2 product files, 1 test file. Not run: cargo test reproduction (no finding to reproduce; CI runs the suite), network-limits.sh (no input-size or storage fan-out change). Unavailable: openzeppelin-platform.